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INVESTMENTS - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
investment
loan
Dec. 31, 2022
USD ($)
investment
loan
Feb. 25, 2022
member
Apr. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
investment
loan
Sep. 30, 2022
USD ($)
investment
Sep. 30, 2023
USD ($)
investment
loan
Sep. 30, 2022
USD ($)
investment
Dec. 31, 2022
USD ($)
investment
loan
Feb. 01, 2023
USD ($)
Aug. 12, 2022
USD ($)
Jun. 02, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jul. 08, 2021
USD ($)
Feb. 08, 2021
USD ($)
May 13, 2020
USD ($)
May 08, 2019
USD ($)
Schedule of Investments [Line Items]                                  
Number of investments entered into | investment         10 21 25 69                  
Purchases of portfolio investments         $ 64,500,000 $ 183,400,000 $ 156,800,000 $ 681,200,000                  
Committed investment amount $ 338,576,000 $ 308,532,000     338,576,000   338,576,000   $ 308,532,000                
Operating dividend income         8,515,000 7,905,000 26,639,000 22,844,000                  
Fair value 2,521,635,000 2,448,935,000 [1]     2,521,635,000   2,521,635,000   2,448,935,000 [1]                
Cost 2,576,197,000 2,562,398,000 [1]     2,576,197,000   2,576,197,000   2,562,398,000 [1]                
Borrowings under credit facilities $ 796,126,000 $ 729,144,000     796,126,000   796,126,000   $ 729,144,000                
Distributions of realized gains by investment companies         $ 0 6,181,000 $ 0 $ 6,181,000                  
Number of members | member     2                            
Investment, interest rate, paid in kind [2] 3.30%       3.30%   3.30%                    
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]             Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments                  
Number of portfolio companies | investment 7 7     7   7   7                
Number of portfolio companies, initiated by the company | investment 2 1     2   2   1                
Single Portfolio Company | Percentage of Total Portfolio, at Fair Value | Portfolio Company Investment Risk                                  
Schedule of Investments [Line Items]                                  
Concentration risk, percent 6.20% 5.90%                              
Fair Value, Inputs, Level 3                                  
Schedule of Investments [Line Items]                                  
Unrealized gain (loss)             $ (5,200,000) $ 44,300,000                  
Minimum | Rocade Holdings LLC                                  
Schedule of Investments [Line Items]                                  
Investment, interest rate, paid in kind                   10.00%              
Maximum | Rocade Holdings LLC                                  
Schedule of Investments [Line Items]                                  
Investment, interest rate, paid in kind                   25.00%              
Jocassee Partners LLC                                  
Schedule of Investments [Line Items]                                  
Repayments received/sales of portfolio investments $ 967,400,000 $ 875,900,000                              
Loss on sale of investments         $ 500,000 5,400,000 300,000 5,600,000                  
Due from related parties 45,100,000 18,200,000     45,100,000   45,100,000   $ 18,200,000                
MassMutual Ascend Life Insurance Company                                  
Schedule of Investments [Line Items]                                  
Number of members | member     2                            
Line of Credit                                  
Schedule of Investments [Line Items]                                  
Long-term debt, gross 796,126,000 729,144,000     796,126,000   796,126,000   729,144,000                
SCRS                                  
Schedule of Investments [Line Items]                                  
Committed investment amount                                 $ 500,000,000
Jocassee Partners LLC | Subscription Facility | Bank Of America Subscription Facility | Line of Credit                                  
Schedule of Investments [Line Items]                                  
Borrowings under credit facilities 174,100,000 174,300,000     174,100,000   174,100,000   174,300,000                
Jocassee Partners LLC | Subscription Facility | Citibank N.A. Subscription Facility | Line of Credit                                  
Schedule of Investments [Line Items]                                  
Borrowings under credit facilities 332,400,000 357,900,000     332,400,000   332,400,000   357,900,000                
Jocassee Partners LLC | Subscription Facility | Term Debt Securitization | Line of Credit                                  
Schedule of Investments [Line Items]                                  
Borrowings under credit facilities 323,400,000 323,400,000     323,400,000   323,400,000   323,400,000                
Thompson Rivers LLC                                  
Schedule of Investments [Line Items]                                  
Dividends         8,000,000 89,100,000 106,000,000 178,500,000                  
Contributed capital 450,000,000       450,000,000   450,000,000                    
All Member Of Waccamaw River LLC                                  
Schedule of Investments [Line Items]                                  
Contributed capital 125,000,000       125,000,000   125,000,000                    
Waccamaw River, LLC                                  
Schedule of Investments [Line Items]                                  
Dividends           2,700,000 7,300,000 6,600,000                  
Waccamaw River, LLC | JPMorgan Chase Bank N.A. Non-Recourse Loan | Secured Debt                                  
Schedule of Investments [Line Items]                                  
Long-term debt, gross 88,300,000 72,300,000     88,300,000   88,300,000   72,300,000                
Waccamaw River, LLC | Barclay Bank PLC Non-Recourse Loan | Secured Debt                                  
Schedule of Investments [Line Items]                                  
Long-term debt, gross 75,200,000 44,800,000     75,200,000   75,200,000   44,800,000                
All Members Of Sierra JV                                  
Schedule of Investments [Line Items]                                  
Number of members | member     4                            
Sierra JV | Revolving Credit Facility | Line of Credit                                  
Schedule of Investments [Line Items]                                  
Borrowings under credit facilities 64,000,000 75,000,000     64,000,000   64,000,000   75,000,000                
Jocassee Partners LLC                                  
Schedule of Investments [Line Items]                                  
Committed investment amount                       $ 50,000,000         $ 50,000,000
Dividends         15,700,000   47,100,000                    
Operating dividend income         1,400,000   4,300,000                    
Fair value 1,256,876,000 1,209,063,000     1,256,876,000   $ 1,256,876,000   $ 1,209,063,000                
Interest-earning assets, average yield             10.00%   8.60%                
Thompson Rivers LLC                                  
Schedule of Investments [Line Items]                                  
Operating dividend income         0 2,200,000 $ 0 7,700,000                  
Fair value 415,631,000 890,911,000     415,631,000   415,631,000   $ 890,911,000                
Cost $ 453,722,000 $ 949,279,000     453,722,000   453,722,000   $ 949,279,000                
Distributions of realized gains by investment companies         $ 1,300,000 12,000,000 $ 16,900,000 20,800,000                  
Investment owned, outstanding loans | loan 2,677 5,414     2,677   2,677   5,414                
Investment owned, weighted average coupon rate 4.00% 4.00%     4.00%   4.00%   4.00%                
Investment owned, average unpaid balance $ 200,000 $ 200,000     $ 200,000   $ 200,000   $ 200,000                
Thompson Rivers LLC | JPMorgan Chase Bank                                  
Schedule of Investments [Line Items]                                  
Repurchase agreement counterparty, amount at risk 101,200,000 224,200,000     101,200,000   101,200,000   224,200,000                
Thompson Rivers LLC | Bank of America N.A.,                                  
Schedule of Investments [Line Items]                                  
Repurchase agreement counterparty, amount at risk 195,600,000 428,000,000     195,600,000   195,600,000   428,000,000                
Thompson Rivers LLC | Barclays Bank                                  
Schedule of Investments [Line Items]                                  
Repurchase agreement counterparty, amount at risk $ 64,100,000 $ 184,200,000     $ 64,100,000   64,100,000   $ 184,200,000                
Waccamaw River, LLC                                  
Schedule of Investments [Line Items]                                  
Operating dividend income           500,000 $ 1,500,000 1,300,000                  
Investment owned, outstanding loans | loan 23,199,000 18,335     23,199,000   23,199,000   18,335                
Investment company, remaining average life to maturity             41 months 25 days   44 months                
Average loan amount $ 10,832 $ 11,542     $ 10,832   $ 10,832   $ 11,542                
Investment company, weighted average interest rate             12.70%   12.00%                
Sierra JV                                  
Schedule of Investments [Line Items]                                  
Dividends         1,500,000 12,000,000 $ 4,400,000 43,800,000                  
Operating dividend income         1,300,000 1,600,000 3,900,000 3,200,000                  
Fair value 91,902,000 110,047,000     91,902,000   91,902,000   $ 110,047,000                
Cost $ 99,026,000 $ 125,220,000     $ 99,026,000   $ 99,026,000   $ 125,220,000                
Dividends, return of capital           9,000,000   35,700,000                  
Weighted average yield 10.20% 9.20%     10.20%   10.20%   9.20%                
Rocade Holdings LLC                                  
Schedule of Investments [Line Items]                                  
Fair value                   $ 45,000,000              
Payments to acquire investments       $ 10,000,000                          
Investment in joint ventures                                  
Schedule of Investments [Line Items]                                  
Purchases of portfolio investments             $ 134,200,000 221,700,000                  
Investment in joint ventures | Jocassee Partners LLC                                  
Schedule of Investments [Line Items]                                  
Fair value $ 37,001,000 $ 61,028,000     $ 37,001,000   37,001,000   $ 61,028,000                
Cost 55,638,000 75,941,000     55,638,000   55,638,000   75,941,000                
Equity Co-Investments                                  
Schedule of Investments [Line Items]                                  
Purchases of portfolio investments             55,000,000                    
Additional Investments in Joint Ventures                                  
Schedule of Investments [Line Items]                                  
Purchases of portfolio investments             2,500,000 13,800,000                  
Portfolio Investments                                  
Schedule of Investments [Line Items]                                  
Purchases of portfolio investments             400,507,000 938,653,000                  
Repayments received/sales of portfolio investments             273,550,000 900,343,000                  
Portfolio Investments | Jocassee Partners LLC                                  
Schedule of Investments [Line Items]                                  
Fair value 1,274,390,000 1,219,889,000     1,274,390,000   1,274,390,000   1,219,889,000                
Cost 1,334,269,000 1,296,355,000     1,334,269,000   1,334,269,000   1,296,355,000                
Ginnie Mae Early Buyout Loans | Thompson Rivers LLC                                  
Schedule of Investments [Line Items]                                  
Fair value 415,600,000 890,900,000     415,600,000   415,600,000   890,900,000                
Cash and Cash Equivalents | Thompson Rivers LLC                                  
Schedule of Investments [Line Items]                                  
Fair value 13,200,000 65,100,000     13,200,000   13,200,000   65,100,000                
Cash and Cash Equivalents | Waccamaw River, LLC                                  
Schedule of Investments [Line Items]                                  
Fair value 21,200,000 8,000,000     21,200,000   21,200,000   8,000,000                
Consumer Loan | Waccamaw River, LLC                                  
Schedule of Investments [Line Items]                                  
Fair value 223,700,000 $ 200,500,000     223,700,000   223,700,000   $ 200,500,000                
Revolving Line of Credit | Eclipse Business Capital Holdings LLC | Minimum                                  
Schedule of Investments [Line Items]                                  
Investment owned, face amount 10,000,000       10,000,000   10,000,000                    
Revolving Line of Credit | Eclipse Business Capital Holdings LLC | Maximum                                  
Schedule of Investments [Line Items]                                  
Investment owned, face amount $ 125,000,000       $ 125,000,000   125,000,000                    
Investments with no Previous Contractual Commitment to Provide Financing                                  
Schedule of Investments [Line Items]                                  
Purchases of portfolio investments             267,100,000 1,301,900,000                  
Investment with Previous Commitment to Provide Financing                                  
Schedule of Investments [Line Items]                                  
Purchases of portfolio investments             $ 81,400,000                    
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing                                  
Schedule of Investments [Line Items]                                  
Purchases of portfolio investments               71,000,000                  
Investment Denominated in Canadian Dollars                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 2 2     2   2   2                
Investment Denominated in Danish Kroner                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 1 1     1   1   1                
Investment Denominated in Australian Dollars                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 10 11     10   10   11                
Investment Denominated in New Zealand Dollars                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 2 2     2   2   2                
Investment Denominated in Norwegian Krone                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 1 1     1   1   1                
Investment Denominated in Swiss Francs                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 2 1     2   2   1                
Investment Denominated in Swedish Krone                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 1 1     1   1   1                
Investment Denominated in Euros                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 65 58     65   65   58                
Investment Denominated in British Pounds Sterling                                  
Schedule of Investments [Line Items]                                  
Number of investments | investment 29 28     29   29   28                
Sierra Merger                                  
Schedule of Investments [Line Items]                                  
Purchases of portfolio investments         $ 73,400,000 $ 50,700,000   $ 442,200,000                  
Number of portfolio companies | investment 4 4     4   4   4                
MVC Acquisition                                  
Schedule of Investments [Line Items]                                  
Number of portfolio companies | investment 1 2     1   1   2                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 0 [2],[3],[4],[5],[6],[7] $ 0 [1],[8],[9],[10],[11],[12]     $ 0 [2],[3],[4],[5],[6],[7]   $ 0 [2],[3],[4],[5],[6],[7]   $ 0 [1],[8],[9],[10],[11],[12]                
Cost 416,000 [2],[3],[4],[5],[6],[7] 419,000 [1],[8],[9],[10],[11],[12]     416,000 [2],[3],[4],[5],[6],[7]   416,000 [2],[3],[4],[5],[6],[7]   419,000 [1],[8],[9],[10],[11],[12]                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 1,127,000 [2],[3],[4],[5],[6],[7] 1,263,000 [1],[8],[9],[10],[11],[12]     1,127,000 [2],[3],[4],[5],[6],[7]   1,127,000 [2],[3],[4],[5],[6],[7]   1,263,000 [1],[8],[9],[10],[11],[12]                
Cost 1,484,000 [2],[3],[4],[5],[6],[7] 1,498,000 [1],[8],[9],[10],[11],[12]     1,484,000 [2],[3],[4],[5],[6],[7]   1,484,000 [2],[3],[4],[5],[6],[7]   1,498,000 [1],[8],[9],[10],[11],[12]                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, Warrants                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [3],[5],[7],[13] 0 [1],[9],[11],[14]     0 [3],[5],[7],[13]   0 [3],[5],[7],[13]   0 [1],[9],[11],[14]                
Cost 0 [3],[5],[7],[13] 0 [1],[9],[11],[14]     0 [3],[5],[7],[13]   0 [3],[5],[7],[13]   0 [1],[9],[11],[14]                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 0 0     0   0   0       $ 0        
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 15,000 0     15,000   15,000   0                
Fair value 1,127,000 1,263,000     1,127,000   1,127,000   1,263,000       0        
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Warrants                                  
Schedule of Investments [Line Items]                                  
Fair value 0 0     0   0   0       0        
Investment, Identifier [Axis]: 1WorldSync, Inc., IT Consulting & Other Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 15,859,000 [2],[4],[7] 16,307,000 [1],[8],[11],[15]     15,859,000 [2],[4],[7]   15,859,000 [2],[4],[7]   16,307,000 [1],[8],[11],[15]                
Cost 16,011,000 [2],[4],[7] 16,124,000 [1],[8],[11],[15]     16,011,000 [2],[4],[7]   16,011,000 [2],[4],[7]   16,124,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: A.T. Holdings II LTD, Other Financial, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 11,850,000 [7],[16] 12,500,000 [1],[11],[17]     11,850,000 [7],[16]   11,850,000 [7],[16]   12,500,000 [1],[11],[17]                
Cost 12,500,000 [7],[16] 12,500,000 [1],[11],[17]     12,500,000 [7],[16]   12,500,000 [7],[16]   12,500,000 [1],[11],[17]                
Investment, Identifier [Axis]: ADB Safegate, Aerospace & Defense, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,199,000 [2],[4],[7],[16] 4,180,000 [1],[8],[11],[12],[17]     5,199,000 [2],[4],[7],[16]   5,199,000 [2],[4],[7],[16]   4,180,000 [1],[8],[11],[12],[17]                
Cost 5,875,000 [2],[4],[7],[16] 5,184,000 [1],[8],[11],[12],[17]     5,875,000 [2],[4],[7],[16]   5,875,000 [2],[4],[7],[16]   5,184,000 [1],[8],[11],[12],[17]                
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 538,000 [7],[13] 798,000 [1],[11],[14]     538,000 [7],[13]   538,000 [7],[13]   798,000 [1],[11],[14]                
Cost 349,000 [7],[13] 349,000 [1],[11],[14]     349,000 [7],[13]   349,000 [7],[13]   349,000 [1],[11],[14]                
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,305,000 [4],[7],[18] 6,215,000 [1],[8],[11],[12]     6,305,000 [4],[7],[18]   6,305,000 [4],[7],[18]   6,215,000 [1],[8],[11],[12]                
Cost 6,350,000 [4],[7],[18] 6,339,000 [1],[8],[11],[12]     6,350,000 [4],[7],[18]   6,350,000 [4],[7],[18]   6,339,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: AMMC CLO 22, Limited Series 2018-22A, Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[9],[17]   3,190,000             3,190,000                
Cost [1],[9],[17]   4,445,000             4,445,000                
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[9],[17]   1,423,000             1,423,000                
Cost [1],[9],[17]   1,860,000             1,860,000                
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes 1                                  
Schedule of Investments [Line Items]                                  
Fair value [5],[16] 2,653,000       2,653,000   2,653,000                    
Cost [5],[16] 4,138,000       4,138,000   4,138,000                    
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes 2                                  
Schedule of Investments [Line Items]                                  
Fair value [5],[16] 1,337,000       1,337,000   1,337,000                    
Cost [5],[16] 1,736,000       1,736,000   1,736,000                    
Investment, Identifier [Axis]: APC1 Holding, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 354,000     0   0   354,000                
Investment, Identifier [Axis]: APC1 Holding, Diversified Manufacturing, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,395,000 [4],[7],[16],[19] 2,044,000 [1],[8],[11],[17],[20]     2,395,000 [4],[7],[16],[19]   2,395,000 [4],[7],[16],[19]   2,044,000 [1],[8],[11],[17],[20]                
Cost 2,311,000 [4],[7],[16],[19] 1,952,000 [1],[8],[11],[17],[20]     2,311,000 [4],[7],[16],[19]   2,311,000 [4],[7],[16],[19]   1,952,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: APOG Bidco Pty Ltd, Healthcare, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,975,000 [4],[7],[16],[21] 2,073,000 [1],[8],[11],[17],[22]     1,975,000 [4],[7],[16],[21]   1,975,000 [4],[7],[16],[21]   2,073,000 [1],[8],[11],[17],[22]                
Cost 2,283,000 [4],[7],[16],[21] 2,279,000 [1],[8],[11],[17],[22]     2,283,000 [4],[7],[16],[21]   2,283,000 [4],[7],[16],[21]   2,279,000 [1],[8],[11],[17],[22]                
Investment, Identifier [Axis]: AQA Acquisition Holding, Inc., High Tech Industries, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 19,660,000 [2],[4],[7] 19,140,000 [1],[8],[11],[12]     19,660,000 [2],[4],[7]   19,660,000 [2],[4],[7]   19,140,000 [1],[8],[11],[12]                
Cost 19,607,000 [2],[4],[7] 19,564,000 [1],[8],[11],[12]     19,607,000 [2],[4],[7]   19,607,000 [2],[4],[7]   19,564,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Class A Units                                  
Schedule of Investments [Line Items]                                  
Fair value 697,000 [7] 620,000 [1],[11],[14]     697,000 [7]   697,000 [7]   620,000 [1],[11],[14]                
Cost 539,000 [7] 539,000 [1],[11],[14]     539,000 [7]   539,000 [7]   539,000 [1],[11],[14]                
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,241,000 [4],[7],[18] 20,920,000 [1],[8],[11],[23]     9,241,000 [4],[7],[18]   9,241,000 [4],[7],[18]   20,920,000 [1],[8],[11],[23]                
Cost 9,211,000 [4],[7],[18] 20,920,000 [1],[8],[11],[23]     9,211,000 [4],[7],[18]   9,211,000 [4],[7],[18]   20,920,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18],[24] (10,000)       (10,000)   (10,000)                    
Cost [4],[7],[18],[24] (13,000)       (13,000)   (13,000)                    
Investment, Identifier [Axis]: ASC Communications, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,089,000 1,089,000     1,089,000   1,089,000   1,089,000                
Investment, Identifier [Axis]: ASPEQ Heating Group LLC, Building Products, Air & Heating, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   8,367,000             8,367,000                
Cost [1],[8],[11],[12]   8,302,000             8,302,000                
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 8,271,000 [2],[4],[7] 8,125,000 [1],[8],[11],[25]     8,271,000 [2],[4],[7]   8,271,000 [2],[4],[7]   8,125,000 [1],[8],[11],[25]                
Cost 8,086,000 [2],[4],[7] 8,129,000 [1],[8],[11],[25]     8,086,000 [2],[4],[7]   8,086,000 [2],[4],[7]   8,129,000 [1],[8],[11],[25]                
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [2],[4],[7],[24] (42,000) [1],[8],[11],[25]     0 [2],[4],[7],[24]   0 [2],[4],[7],[24]   (42,000) [1],[8],[11],[25]                
Cost (36,000) [2],[4],[7],[24] (41,000) [1],[8],[11],[25]     (36,000) [2],[4],[7],[24]   (36,000) [2],[4],[7],[24]   (41,000) [1],[8],[11],[25]                
Investment, Identifier [Axis]: ATL II MRO Holdings, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,667,000 1,667,000     1,667,000   1,667,000   1,667,000                
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 4,601,000 [4],[18] 4,416,000 [1],[8],[26]     4,601,000 [4],[18]   4,601,000 [4],[18]   4,416,000 [1],[8],[26]                
Cost $ 4,571,000 [4],[18] $ 4,505,000 [1],[8],[26]     $ 4,571,000 [4],[18]   $ 4,571,000 [4],[18]   $ 4,505,000 [1],[8],[26]                
Investment, interest rate, paid in kind 0.30% [4],[18] 0.30% [1],[8],[26]     0.30% [4],[18]   0.30% [4],[18]   0.30% [1],[8],[26]                
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value $ 722,000 [4],[18] $ 685,000 [1],[8],[26]     $ 722,000 [4],[18]   $ 722,000 [4],[18]   $ 685,000 [1],[8],[26]                
Cost $ 710,000 [4],[18] $ 700,000 [1],[8],[26]     $ 710,000 [4],[18]   $ 710,000 [4],[18]   $ 700,000 [1],[8],[26]                
Investment, interest rate, paid in kind 1.00% [4],[18] 1.00% [1],[8],[26]     1.00% [4],[18]   1.00% [4],[18]   1.00% [1],[8],[26]                
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 3                                  
Schedule of Investments [Line Items]                                  
Fair value $ 6,243,000 $ 5,919,000 [1]     $ 6,243,000   $ 6,243,000   $ 5,919,000 [1]                
Cost $ 6,013,000 $ 5,703,000 [1]     $ 6,013,000   $ 6,013,000   $ 5,703,000 [1]                
Investment, interest rate, paid in kind 10.00% 10.00% [1]     10.00%   10.00%   10.00% [1]                
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class A Convertible Preferred Equity                                  
Schedule of Investments [Line Items]                                  
Fair value $ 5,743,000 [7],[13] $ 5,403,000 [1],[11],[14]     $ 5,743,000 [7],[13]   $ 5,743,000 [7],[13]   $ 5,403,000 [1],[11],[14]                
Cost 5,000,000 [7],[13] 5,000,000 [1],[11],[14]     5,000,000 [7],[13]   5,000,000 [7],[13]   5,000,000 [1],[11],[14]                
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class B Convertible Preferred Equity                                  
Schedule of Investments [Line Items]                                  
Fair value 1,875,000 [7],[13] 1,667,000 [1],[11],[14]     1,875,000 [7],[13]   1,875,000 [7],[13]   1,667,000 [1],[11],[14]                
Cost 1,667,000 [7],[13] 1,667,000 [1],[11],[14]     1,667,000 [7],[13]   1,667,000 [7],[13]   1,667,000 [1],[11],[14]                
Investment, Identifier [Axis]: Accelerate Learning, Inc., Education Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   7,480,000             7,480,000                
Cost [1],[8],[11],[12]   7,511,000             7,511,000                
Investment, Identifier [Axis]: Acclime Holdings HK Limited, Business services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,428,000 [4],[7],[16],[27] 2,436,000 [1],[8],[11],[17],[28]     2,428,000 [4],[7],[16],[27]   2,428,000 [4],[7],[16],[27]   2,436,000 [1],[8],[11],[17],[28]                
Cost 2,454,000 [4],[7],[16],[27] 2,447,000 [1],[8],[11],[17],[28]     2,454,000 [4],[7],[16],[27]   2,454,000 [4],[7],[16],[27]   2,447,000 [1],[8],[11],[17],[28]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 384,000 [7],[13] 436,000 [1],[11],[14]     384,000 [7],[13]   384,000 [7],[13]   436,000 [1],[11],[14]                
Cost 438,000 [7],[13] 438,000 [1],[11],[14]     438,000 [7],[13]   438,000 [7],[13]   438,000 [1],[11],[14]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 11,469,000 [2],[4],[7] 12,069,000 [1],[8],[11],[12]     11,469,000 [2],[4],[7]   11,469,000 [2],[4],[7]   12,069,000 [1],[8],[11],[12]                
Cost 12,017,000 [2],[4],[7] 12,099,000 [1],[8],[11],[12]     12,017,000 [2],[4],[7]   12,017,000 [2],[4],[7]   12,099,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 1,655,000 [2],[4],[7],[24] 1,116,000 [1],[8],[11],[12]     1,655,000 [2],[4],[7],[24]   1,655,000 [2],[4],[7],[24]   1,116,000 [1],[8],[11],[12]                
Cost 1,760,000 [2],[4],[7],[24] 1,122,000 [1],[8],[11],[12]     1,760,000 [2],[4],[7],[24]   1,760,000 [2],[4],[7],[24]   1,122,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 519,000 1,152,000     519,000   519,000   1,152,000                
Investment, Identifier [Axis]: Acogroup, Business Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 7,191,000 [4],[7],[16] 7,276,000 [1],[8],[11],[17],[29]     7,191,000 [4],[7],[16]   7,191,000 [4],[7],[16]   7,276,000 [1],[8],[11],[17],[29]                
Cost $ 7,951,000 [4],[7],[16] 7,782,000 [1],[8],[11],[17],[29]     $ 7,951,000 [4],[7],[16]   $ 7,951,000 [4],[7],[16]   7,782,000 [1],[8],[11],[17],[29]                
Investment, interest rate, paid in kind [4],[7],[16] 2.30%       2.30%   2.30%                    
Investment, Identifier [Axis]: Adhefin International, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 402,000 0     $ 402,000   $ 402,000   0                
Investment, Identifier [Axis]: Adhefin International, Industrial Other, First Lien Senior Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[19],[24] 1,699,000       1,699,000   1,699,000                    
Cost [4],[7],[16],[19],[24] 1,758,000       1,758,000   1,758,000                    
Investment, Identifier [Axis]: Adhefin International, Industrial Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[19] 287,000       287,000   287,000                    
Cost [4],[7],[16],[19] $ 296,000       $ 296,000   $ 296,000                    
Investment, interest rate, paid in kind [4],[7],[16],[19] 14.50%       14.50%   14.50%                    
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A1 Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value $ 739,000 [7],[13] 671,000 [1],[11],[14]     $ 739,000 [7],[13]   $ 739,000 [7],[13]   671,000 [1],[11],[14]                
Cost 280,000 [7],[13] 280,000 [1],[11],[14]     280,000 [7],[13]   280,000 [7],[13]   280,000 [1],[11],[14]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A2 Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 191,000 [7],[13] 173,000 [1],[11],[14]     191,000 [7],[13]   191,000 [7],[13]   173,000 [1],[11],[14]                
Cost 72,000 [7],[13] 72,000 [1],[11],[14]     72,000 [7],[13]   72,000 [7],[13]   72,000 [1],[11],[14]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B1 Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Cost 9,000 [7],[13] 9,000 [1],[11],[14]     9,000 [7],[13]   9,000 [7],[13]   9,000 [1],[11],[14]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B2 Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Cost 2,000 [7],[13] 2,000 [1],[11],[14]     2,000 [7],[13]   2,000 [7],[13]   2,000 [1],[11],[14]                
Investment, Identifier [Axis]: Air Canada 2020-2 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                                  
Schedule of Investments [Line Items]                                  
Fair value 4,199,000 4,816,000 [1]     4,199,000   4,199,000   4,816,000 [1]                
Cost 4,176,000 4,841,000 [1]     4,176,000   4,176,000   4,841,000 [1]                
Investment, Identifier [Axis]: Air Comm Corporation LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,549,000 0     1,549,000   1,549,000   0                
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 12,445,000 [2],[4],[7],[24] 12,722,000 [1],[8],[11],[12]     12,445,000 [2],[4],[7],[24]   12,445,000 [2],[4],[7],[24]   12,722,000 [1],[8],[11],[12]                
Cost 12,565,000 [2],[4],[7],[24] 12,671,000 [1],[8],[11],[12]     12,565,000 [2],[4],[7],[24]   12,565,000 [2],[4],[7],[24]   12,671,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,707,000 0     1,707,000   1,707,000   0                
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Insurance, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[19],[24] 3,149,000       3,149,000   3,149,000                    
Cost [4],[7],[16],[19],[24] 3,176,000       3,176,000   3,176,000                    
Investment, Identifier [Axis]: Alpine SG, LLC, High Tech Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 22,792,000 [2],[4],[5],[7] 22,677,000 [1],[8],[9],[11],[23]     22,792,000 [2],[4],[5],[7]   22,792,000 [2],[4],[5],[7]   22,677,000 [1],[8],[9],[11],[23]                
Cost 22,679,000 [2],[4],[5],[7] 22,678,000 [1],[8],[9],[11],[23]     22,679,000 [2],[4],[5],[7]   22,679,000 [2],[4],[5],[7]   22,678,000 [1],[8],[9],[11],[23]                
Investment, Identifier [Axis]: Alpine US Bidco LLC, Agricultural Products, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 17,158,000 [4],[7],[18] 16,704,000 [1],[8],[26]     17,158,000 [4],[7],[18]   17,158,000 [4],[7],[18]   16,704,000 [1],[8],[26]                
Cost 17,733,000 [4],[7],[18] 17,692,000 [1],[8],[26]     17,733,000 [4],[7],[18]   17,733,000 [4],[7],[18]   17,692,000 [1],[8],[26]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Class B Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 1,137,000 [7],[13],[16] 1,121,000 [1],[11],[14],[17]     1,137,000 [7],[13],[16]   1,137,000 [7],[13],[16]   1,121,000 [1],[11],[14],[17]                
Cost 1,040,000 [7],[13],[16] 1,040,000 [1],[11],[14],[17]     1,040,000 [7],[13],[16]   1,040,000 [7],[13],[16]   1,040,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Subordinated Loan Notes                                  
Schedule of Investments [Line Items]                                  
Fair value 4,467,000 [7],[16] 4,303,000 [1],[11],[12],[17]     4,467,000 [7],[16]   4,467,000 [7],[16]   4,303,000 [1],[11],[12],[17]                
Cost $ 4,676,000 [7],[16] $ 4,451,000 [1],[11],[12],[17]     $ 4,676,000 [7],[16]   $ 4,676,000 [7],[16]   $ 4,451,000 [1],[11],[12],[17]                
Investment, interest rate, paid in kind 9.00% [7],[16] 9.00% [1],[11],[12],[17]     9.00% [7],[16]   9.00% [7],[16]   9.00% [1],[11],[12],[17]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrant                                  
Schedule of Investments [Line Items]                                  
Fair value $ 506,000 [7],[13],[16] $ 426,000 [1],[11],[14],[17]     $ 506,000 [7],[13],[16]   $ 506,000 [7],[13],[16]   $ 426,000 [1],[11],[14],[17]                
Cost 4,000 [7],[13],[16] 4,000 [1],[11],[14],[17]     4,000 [7],[13],[16]   4,000 [7],[13],[16]   4,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 470,000 0     470,000   470,000   0                
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 85,000       85,000   85,000                    
Cost [7],[13] 88,000       88,000   88,000                    
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] 1,898,000       1,898,000   1,898,000                    
Cost [4],[7],[18] 1,894,000       1,894,000   1,894,000                    
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18],[24] (10,000)       (10,000)   (10,000)                    
Cost [4],[7],[18],[24] (11,000)       (11,000)   (11,000)                    
Investment, Identifier [Axis]: Amtech LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 764,000 1,527,000     764,000   764,000   1,527,000                
Investment, Identifier [Axis]: Amtech LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 477,000 545,000     477,000   477,000   545,000                
Investment, Identifier [Axis]: Amtech LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,980,000 [2],[4],[7],[24] 2,222,000 [1],[8],[11],[26]     2,980,000 [2],[4],[7],[24]   2,980,000 [2],[4],[7],[24]   2,222,000 [1],[8],[11],[26]                
Cost 2,961,000 [2],[4],[7],[24] 2,205,000 [1],[8],[11],[26]     2,961,000 [2],[4],[7],[24]   2,961,000 [2],[4],[7],[24]   2,205,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Amtech LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 198,000 [2],[4],[7],[24] 128,000 [1],[8],[11],[26]     198,000 [2],[4],[7],[24]   198,000 [2],[4],[7],[24]   128,000 [1],[8],[11],[26]                
Cost 195,000 [2],[4],[7],[24] 125,000 [1],[8],[11],[26]     195,000 [2],[4],[7],[24]   195,000 [2],[4],[7],[24]   125,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Anagram Holdings, LLC, Chemicals, Plastics, & Rubber, First Lien Senior Secured Note                                  
Schedule of Investments [Line Items]                                  
Fair value 14,801,000 14,368,000 [1]     14,801,000   14,801,000   14,368,000 [1]                
Cost $ 15,026,000 $ 14,392,000 [1]     $ 15,026,000   $ 15,026,000   $ 14,392,000 [1]                
Investment, interest rate, paid in kind 10.00% 5.00% [1]     10.00%   10.00%   5.00% [1]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Bridge Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 364,000 $ 366,000     $ 364,000   $ 364,000   $ 366,000                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,029,000 [4],[7],[16],[19] 2,330,000 [1],[8],[11],[17],[20]     3,029,000 [4],[7],[16],[19]   3,029,000 [4],[7],[16],[19]   2,330,000 [1],[8],[11],[17],[20]                
Cost 3,179,000 [4],[7],[16],[19] 2,382,000 [1],[8],[11],[17],[20]     3,179,000 [4],[7],[16],[19]   3,179,000 [4],[7],[16],[19]   2,382,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 5,579,000 [4],[7],[16],[19] 723,000 [1],[8],[11],[17],[20]     5,579,000 [4],[7],[16],[19]   5,579,000 [4],[7],[16],[19]   723,000 [1],[8],[11],[17],[20]                
Cost 5,761,000 [4],[7],[16],[19] 790,000 [1],[8],[11],[17],[20]     5,761,000 [4],[7],[16],[19]   5,761,000 [4],[7],[16],[19]   790,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 1,624,000 [4],[7],[16],[19] 5,623,000 [1],[8],[11],[17],[20]     1,624,000 [4],[7],[16],[19]   1,624,000 [4],[7],[16],[19]   5,623,000 [1],[8],[11],[17],[20]                
Cost 1,583,000 [4],[7],[16],[19] 5,745,000 [1],[8],[11],[17],[20]     1,583,000 [4],[7],[16],[19]   1,583,000 [4],[7],[16],[19]   5,745,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 3                                  
Schedule of Investments [Line Items]                                  
Fair value 997,000 [2],[4],[7],[16] 997,000 [1],[8],[11],[12],[17]     997,000 [2],[4],[7],[16]   997,000 [2],[4],[7],[16]   997,000 [1],[8],[11],[12],[17]                
Cost 1,018,000 [2],[4],[7],[16] 1,019,000 [1],[8],[11],[12],[17]     1,018,000 [2],[4],[7],[16]   1,018,000 [2],[4],[7],[16]   1,019,000 [1],[8],[11],[12],[17]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (8,000) [4],[7],[16],[19],[24] (8,000) [1],[8],[11],[17],[20]     (8,000) [4],[7],[16],[19],[24]   (8,000) [4],[7],[16],[19],[24]   (8,000) [1],[8],[11],[17],[20]                
Cost 0 [4],[7],[16],[19],[24] (5,000) [1],[8],[11],[17],[20]     0 [4],[7],[16],[19],[24]   0 [4],[7],[16],[19],[24]   (5,000) [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Anju Software, Inc., Application Software, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,883,000 [4],[6],[7],[18] 11,006,000 [1],[8],[11],[26]     9,883,000 [4],[6],[7],[18]   9,883,000 [4],[6],[7],[18]   11,006,000 [1],[8],[11],[26]                
Cost 13,241,000 [4],[6],[7],[18] 13,269,000 [1],[8],[11],[26]     13,241,000 [4],[6],[7],[18]   13,241,000 [4],[6],[7],[18]   13,269,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,779,000 [4],[7],[16],[30] 1,753,000 [1],[8],[11],[17],[31]     1,779,000 [4],[7],[16],[30]   1,779,000 [4],[7],[16],[30]   1,753,000 [1],[8],[11],[17],[31]                
Cost 1,881,000 [4],[7],[16],[30] 1,876,000 [1],[8],[11],[17],[31]     1,881,000 [4],[7],[16],[30]   1,881,000 [4],[7],[16],[30]   1,876,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, Subordinated Senior Unsecured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 271,000 [7],[16] 266,000 [1],[11],[17]     271,000 [7],[16]   271,000 [7],[16]   266,000 [1],[11],[17]                
Cost $ 303,000 [7],[16] $ 285,000 [1],[11],[17]     $ 303,000 [7],[16]   $ 303,000 [7],[16]   $ 285,000 [1],[11],[17]                
Investment, interest rate, paid in kind 8.00% 8.00% [1],[11],[17]     8.00%   8.00%   8.00% [1],[11],[17]                
Investment, Identifier [Axis]: Apidos CLO XXIV, Series 2016-24A, Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value $ 7,353,000 [5],[16] $ 6,635,000 [1],[9],[17]     $ 7,353,000 [5],[16]   $ 7,353,000 [5],[16]   $ 6,635,000 [1],[9],[17]                
Cost 5,878,000 [5],[16] 6,934,000 [1],[9],[17]     5,878,000 [5],[16]   5,878,000 [5],[16]   6,934,000 [1],[9],[17]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [7],[13],[16] 6,000 [1],[11],[14],[17]     0 [7],[13],[16]   0 [7],[13],[16]   6,000 [1],[11],[14],[17]                
Cost 12,000 [7],[13],[16] 12,000 [1],[11],[14],[17]     12,000 [7],[13],[16]   12,000 [7],[13],[16]   12,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,022,000 [4],[7],[16],[32] 5,085,000 [1],[8],[11],[17],[33]     2,022,000 [4],[7],[16],[32]   2,022,000 [4],[7],[16],[32]   5,085,000 [1],[8],[11],[17],[33]                
Cost 2,611,000 [4],[7],[16],[32] 5,466,000 [1],[8],[11],[17],[33]     2,611,000 [4],[7],[16],[32]   2,611,000 [4],[7],[16],[32]   5,466,000 [1],[8],[11],[17],[33]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 3,000 [7],[13],[16] 110,000 [1],[11],[14],[17]     3,000 [7],[13],[16]   3,000 [7],[13],[16]   110,000 [1],[11],[14],[17]                
Cost 120,000 [7],[13],[16] 120,000 [1],[11],[14],[17]     120,000 [7],[13],[16]   120,000 [7],[13],[16]   120,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Apus Bidco Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,439,000 [4],[7],[16],[30] 3,344,000 [1],[8],[11],[17],[34]     3,439,000 [4],[7],[16],[30]   3,439,000 [4],[7],[16],[30]   3,344,000 [1],[8],[11],[17],[34]                
Cost 3,896,000 [4],[7],[16],[30] 3,886,000 [1],[8],[11],[17],[34]     3,896,000 [4],[7],[16],[30]   3,896,000 [4],[7],[16],[30]   3,886,000 [1],[8],[11],[17],[34]                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Capex / Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,127,000 2,543,000     2,127,000   2,127,000   2,543,000                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,673,000 [4],[7],[16],[35] 5,263,000 [1],[8],[11],[17],[34]     5,673,000 [4],[7],[16],[35]   5,673,000 [4],[7],[16],[35]   5,263,000 [1],[8],[11],[17],[34]                
Cost 6,477,000 [4],[7],[16],[35] 5,806,000 [1],[8],[11],[17],[34]     6,477,000 [4],[7],[16],[35]   6,477,000 [4],[7],[16],[35]   5,806,000 [1],[8],[11],[17],[34]                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[34]   198,000             198,000                
Cost [1],[8],[11],[17],[34]   175,000             175,000                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,520,000 [4],[7],[16],[35] 1,475,000 [1],[8],[11],[17],[34]     1,520,000 [4],[7],[16],[35]   1,520,000 [4],[7],[16],[35]   1,475,000 [1],[8],[11],[17],[34]                
Cost $ 1,734,000 [4],[7],[16],[35] 1,617,000 [1],[8],[11],[17],[34]     $ 1,734,000 [4],[7],[16],[35]   $ 1,734,000 [4],[7],[16],[35]   1,617,000 [1],[8],[11],[17],[34]                
Investment, interest rate, paid in kind [4],[7],[16],[35] 15.90%       15.90%   15.90%                    
Investment, Identifier [Axis]: Arc Education, Consumer Cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 3,416,000 [4],[7],[16],[19],[24] 2,969,000 [1],[8],[11],[17],[20]     $ 3,416,000 [4],[7],[16],[19],[24]   $ 3,416,000 [4],[7],[16],[19],[24]   2,969,000 [1],[8],[11],[17],[20]                
Cost 3,261,000 [4],[7],[16],[19],[24] 2,794,000 [1],[8],[11],[17],[20]     3,261,000 [4],[7],[16],[19],[24]   3,261,000 [4],[7],[16],[19],[24]   2,794,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Arc Education, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,444,000 1,900,000     1,444,000   1,444,000   1,900,000                
Investment, Identifier [Axis]: Arch Global Precision LLC, Industrial Machinery, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 8,993,000 [2],[4],[7] 9,094,000 [1],[8],[11],[12]     8,993,000 [2],[4],[7]   8,993,000 [2],[4],[7]   9,094,000 [1],[8],[11],[12]                
Cost 9,082,000 [2],[4],[7] 9,151,000 [1],[8],[11],[12]     9,082,000 [2],[4],[7]   9,082,000 [2],[4],[7]   9,151,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Archimede, Consumer Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,003,000 [4],[7],[16],[19] 6,164,000 [1],[8],[11],[17],[20]     6,003,000 [4],[7],[16],[19]   6,003,000 [4],[7],[16],[19]   6,164,000 [1],[8],[11],[17],[20]                
Cost 6,470,000 [4],[7],[16],[19] 6,474,000 [1],[8],[11],[17],[20]     6,470,000 [4],[7],[16],[19]   6,470,000 [4],[7],[16],[19]   6,474,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Argus Bidco Limited, CAF Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 518,000 789,000     518,000   518,000   789,000                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [7],[13],[16] 0 [1],[11],[14],[17]     0 [7],[13],[16]   0 [7],[13],[16]   0 [1],[11],[14],[17]                
Cost 1,000 [7],[13],[16] 1,000 [1],[11],[14],[17]     1,000 [7],[13],[16]   1,000 [7],[13],[16]   1,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Equity Loan Notes                                  
Schedule of Investments [Line Items]                                  
Fair value 45,000 [7],[16] 50,000 [1],[11],[17]     45,000 [7],[16]   45,000 [7],[16]   50,000 [1],[11],[17]                
Cost $ 54,000 [7],[16] $ 51,000 [1],[11],[17]     $ 54,000 [7],[16]   $ 54,000 [7],[16]   $ 51,000 [1],[11],[17]                
Investment, interest rate, paid in kind 10.00% [7],[16] 10.00% [1],[11],[17]     10.00% [7],[16]   10.00% [7],[16]   10.00% [1],[11],[17]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value $ 125,000 [2],[4],[7],[16] $ 126,000 [1],[8],[11],[15],[17]     $ 125,000 [2],[4],[7],[16]   $ 125,000 [2],[4],[7],[16]   $ 126,000 [1],[8],[11],[15],[17]                
Cost 128,000 [2],[4],[7],[16] 126,000 [1],[8],[11],[15],[17]     128,000 [2],[4],[7],[16]   128,000 [2],[4],[7],[16]   126,000 [1],[8],[11],[15],[17]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 293,000 [4],[7],[16],[19] 1,536,000 [1],[8],[11],[17],[31]     293,000 [4],[7],[16],[19]   293,000 [4],[7],[16],[19]   1,536,000 [1],[8],[11],[17],[31]                
Cost $ 289,000 [4],[7],[16],[19] 1,514,000 [1],[8],[11],[17],[31]     $ 289,000 [4],[7],[16],[19]   $ 289,000 [4],[7],[16],[19]   1,514,000 [1],[8],[11],[17],[31]                
Investment, interest rate, paid in kind 3.30%       3.30%   3.30%                    
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3                                  
Schedule of Investments [Line Items]                                  
Fair value $ 1,336,000 [4],[7],[16],[19] 1,547,000 [1],[8],[11],[17],[20]     $ 1,336,000 [4],[7],[16],[19]   $ 1,336,000 [4],[7],[16],[19]   1,547,000 [1],[8],[11],[17],[20]                
Cost 1,363,000 [4],[7],[16],[19] 1,502,000 [1],[8],[11],[17],[20]     1,363,000 [4],[7],[16],[19]   1,363,000 [4],[7],[16],[19]   1,502,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 4                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[30] 1,559,000       1,559,000   1,559,000                    
Cost [4],[7],[16],[30] $ 1,564,000       $ 1,564,000   $ 1,564,000                    
Investment, interest rate, paid in kind [4],[7],[16],[30] 3.30%       3.30%   3.30%                    
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 5                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[24],[30] $ (28,000)       $ (28,000)   $ (28,000)                    
Cost [4],[7],[16],[24],[30] (12,000)       (12,000)   (12,000)                    
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 45,000 [7],[16] 50,000 [1],[11],[17]     45,000 [7],[16]   45,000 [7],[16]   50,000 [1],[11],[17]                
Cost $ 54,000 [7],[16] $ 51,000 [1],[11],[17]     $ 54,000 [7],[16]   $ 54,000 [7],[16]   $ 51,000 [1],[11],[17]                
Investment, interest rate, paid in kind 10.00% [7],[16] 10.00% [1],[11],[17]     10.00% [7],[16]   10.00% [7],[16]   10.00% [1],[11],[17]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Second Lien Term Loan Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[16] $ 667,000       $ 667,000   $ 667,000                    
Cost [7],[16] $ 687,000       $ 687,000   $ 687,000                    
Investment, interest rate, paid in kind [7],[16] 10.50%       10.50%   10.50%                    
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[17]   $ 487,000             $ 487,000                
Cost [1],[11],[17]   $ 480,000             $ 480,000                
Investment, interest rate, paid in kind [1],[11],[17]   10.50%             10.50%                
Investment, Identifier [Axis]: Argus Bidco Limited, RCF Bridge Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 0 $ 168,000     $ 0   $ 0   $ 168,000                
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 3,839,000 [4],[7],[27] 3,896,000 [1],[8],[11],[12]     3,839,000 [4],[7],[27]   3,839,000 [4],[7],[27]   3,896,000 [1],[8],[11],[12]                
Cost 3,928,000 [4],[7],[27] 3,950,000 [1],[8],[11],[12]     3,928,000 [4],[7],[27]   3,928,000 [4],[7],[27]   3,950,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 4,758,000 [4],[7],[27] 4,932,000 [1],[8],[11],[25]     4,758,000 [4],[7],[27]   4,758,000 [4],[7],[27]   4,932,000 [1],[8],[11],[25]                
Cost 4,841,000 [4],[7],[27] 4,946,000 [1],[8],[11],[25]     4,841,000 [4],[7],[27]   4,841,000 [4],[7],[27]   4,946,000 [1],[8],[11],[25]                
Investment, Identifier [Axis]: Astra Bidco Limited, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 578,000 876,000     578,000   578,000   876,000                
Investment, Identifier [Axis]: Astra Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,272,000 [4],[7],[16],[35] 1,886,000 [1],[8],[11],[17],[31]     2,272,000 [4],[7],[16],[35]   2,272,000 [4],[7],[16],[35]   1,886,000 [1],[8],[11],[17],[31]                
Cost 2,428,000 [4],[7],[16],[35] 2,103,000 [1],[8],[11],[17],[31]     2,428,000 [4],[7],[16],[35]   2,428,000 [4],[7],[16],[35]   2,103,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 1,364,000 [4],[7],[16],[32] 1,305,000 [1],[8],[11],[17],[29]     1,364,000 [4],[7],[16],[32]   1,364,000 [4],[7],[16],[32]   1,305,000 [1],[8],[11],[17],[29]                
Cost 1,531,000 [4],[7],[16],[32] 1,526,000 [1],[8],[11],[17],[29]     1,531,000 [4],[7],[16],[32]   1,531,000 [4],[7],[16],[32]   1,526,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 752,000 [4],[7],[16],[35] 704,000 [1],[8],[11],[17],[31]     752,000 [4],[7],[16],[35]   752,000 [4],[7],[16],[35]   704,000 [1],[8],[11],[17],[31]                
Cost 904,000 [4],[7],[16],[35] 901,000 [1],[8],[11],[17],[31]     904,000 [4],[7],[16],[35]   904,000 [4],[7],[16],[35]   901,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,233,000 1,295,000     1,233,000   1,233,000   1,295,000                
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,068,000 [4],[7],[16],[36] 2,298,000 [1],[8],[11],[17],[37]     2,068,000 [4],[7],[16],[36]   2,068,000 [4],[7],[16],[36]   2,298,000 [1],[8],[11],[17],[37]                
Cost 2,430,000 [4],[7],[16],[36] 2,417,000 [1],[8],[11],[17],[37]     2,430,000 [4],[7],[16],[36]   2,430,000 [4],[7],[16],[36]   2,417,000 [1],[8],[11],[17],[37]                
Investment, Identifier [Axis]: Aviation Technical Services, Inc., Aerospace & Defense, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 28,956,000 [4],[5],[7],[18] 27,794,000 [1],[8],[9],[11],[26]     28,956,000 [4],[5],[7],[18]   28,956,000 [4],[5],[7],[18]   27,794,000 [1],[8],[9],[11],[26]                
Cost $ 28,114,000 [4],[5],[7],[18] $ 27,165,000 [1],[8],[9],[11],[26]     $ 28,114,000 [4],[5],[7],[18]   $ 28,114,000 [4],[5],[7],[18]   $ 27,165,000 [1],[8],[9],[11],[26]                
Investment, interest rate, paid in kind 6.50% [4],[5],[7],[18] 6.50% [1],[8],[9],[11],[26]     6.50% [4],[5],[7],[18]   6.50% [4],[5],[7],[18]   6.50% [1],[8],[9],[11],[26]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 644,000 $ 962,000     $ 644,000   $ 644,000   $ 962,000                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 481,000 481,000     481,000   481,000   481,000                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 227,000 [7],[13] 183,000 [1],[11],[14]     227,000 [7],[13]   227,000 [7],[13]   183,000 [1],[11],[14]                
Cost 192,000 [7],[13] 192,000 [1],[11],[14]     192,000 [7],[13]   192,000 [7],[13]   192,000 [1],[11],[14]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,800,000 [2],[4],[7] 4,489,000 [1],[8],[11],[12]     4,800,000 [2],[4],[7]   4,800,000 [2],[4],[7]   4,489,000 [1],[8],[11],[12]                
Cost 4,763,000 [2],[4],[7] 4,467,000 [1],[8],[11],[12]     4,763,000 [2],[4],[7]   4,763,000 [2],[4],[7]   4,467,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (4,000) [2],[4],[7],[24] (6,000) [1],[8],[11],[12]     (4,000) [2],[4],[7],[24]   (4,000) [2],[4],[7],[24]   (6,000) [1],[8],[11],[12]                
Cost (7,000) [2],[4],[7],[24] (8,000) [1],[8],[11],[12]     (7,000) [2],[4],[7],[24]   (7,000) [2],[4],[7],[24]   (8,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,510,000 [7] 1,403,000 [1],[11]     1,510,000 [7]   1,510,000 [7]   1,403,000 [1],[11]                
Cost $ 1,544,000 [7] $ 1,409,000 [1],[11]     $ 1,544,000 [7]   $ 1,544,000 [7]   $ 1,409,000 [1],[11]                
Investment, interest rate, paid in kind 12.00% [7] 12.00% [1],[11]     12.00% [7]   12.00% [7]   12.00% [1],[11]                
Investment, Identifier [Axis]: BPG Holdings IV Corp, Capital Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] $ 13,434,000       $ 13,434,000   $ 13,434,000                    
Cost [2],[4],[7] 13,484,000       13,484,000   13,484,000                    
Investment, Identifier [Axis]: BVI Medical, Inc., Healthcare, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,213,000 [4],[7],[19] $ 9,495,000 [1],[8],[11],[20]     9,213,000 [4],[7],[19]   9,213,000 [4],[7],[19]   $ 9,495,000 [1],[8],[11],[20]                
Cost 9,471,000 [4],[7],[19] 9,404,000 [1],[8],[11],[20]     9,471,000 [4],[7],[19]   9,471,000 [4],[7],[19]   9,404,000 [1],[8],[11],[20]                
Investment, Identifier [Axis]: Bariacum S.A, Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 953,000 2,028,000     953,000   953,000   2,028,000                
Investment, Identifier [Axis]: Bariacum S.A, Consumer Products, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,223,000 [4],[7],[16],[32] 5,944,000 [1],[8],[11],[17],[29]     2,223,000 [4],[7],[16],[32]   2,223,000 [4],[7],[16],[32]   5,944,000 [1],[8],[11],[17],[29]                
Cost 2,252,000 [4],[7],[16],[32] 6,264,000 [1],[8],[11],[17],[29]     2,252,000 [4],[7],[16],[32]   2,252,000 [4],[7],[16],[32]   6,264,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Benify (Bennevis AB), High Tech Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,016,000 [4],[7],[16],[38] 1,060,000 [1],[8],[11],[17],[39]     1,016,000 [4],[7],[16],[38]   1,016,000 [4],[7],[16],[38]   1,060,000 [1],[8],[11],[17],[39]                
Cost 1,163,000 [4],[7],[16],[38] 1,161,000 [1],[8],[11],[17],[39]     1,163,000 [4],[7],[16],[38]   1,163,000 [4],[7],[16],[38]   1,161,000 [1],[8],[11],[17],[39]                
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,423,000 2,423,000     2,423,000   2,423,000   2,423,000                
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Other Financial, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,498,000 [2],[4],[7] 2,493,000 [1],[8],[11],[26]     2,498,000 [2],[4],[7]   2,498,000 [2],[4],[7]   2,493,000 [1],[8],[11],[26]                
Cost 2,509,000 [2],[4],[7] 2,499,000 [1],[8],[11],[26]     2,509,000 [2],[4],[7]   2,509,000 [2],[4],[7]   2,499,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Bidwax, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 7,336,000 [4],[7],[16],[32] 7,254,000 [1],[8],[11],[17],[29]     7,336,000 [4],[7],[16],[32]   7,336,000 [4],[7],[16],[32]   7,254,000 [1],[8],[11],[17],[29]                
Cost 8,110,000 [4],[7],[16],[32] 8,089,000 [1],[8],[11],[17],[29]     8,110,000 [4],[7],[16],[32]   8,110,000 [4],[7],[16],[32]   8,089,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 2,401,000 [2],[4],[7],[16] 2,484,000 [1],[8],[11],[15],[17]     2,401,000 [2],[4],[7],[16]   2,401,000 [2],[4],[7],[16]   2,484,000 [1],[8],[11],[15],[17]                
Cost 2,483,000 [2],[4],[7],[16] 2,476,000 [1],[8],[11],[15],[17]     2,483,000 [2],[4],[7],[16]   2,483,000 [2],[4],[7],[16]   2,476,000 [1],[8],[11],[15],[17]                
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 776,000 [4],[7],[16],[30] 792,000 [1],[8],[11],[17],[31]     776,000 [4],[7],[16],[30]   776,000 [4],[7],[16],[30]   792,000 [1],[8],[11],[17],[31]                
Cost 895,000 [4],[7],[16],[30] 893,000 [1],[8],[11],[17],[31]     895,000 [4],[7],[16],[30]   895,000 [4],[7],[16],[30]   893,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: Biolam Group, Consumer Non-cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,298,000 [4],[7],[16],[19] 2,939,000 [1],[8],[11],[17],[20]     2,298,000 [4],[7],[16],[19]   2,298,000 [4],[7],[16],[19]   2,939,000 [1],[8],[11],[17],[20]                
Cost $ 2,414,000 [4],[7],[16],[19] 2,956,000 [1],[8],[11],[17],[20]     $ 2,414,000 [4],[7],[16],[19]   $ 2,414,000 [4],[7],[16],[19]   2,956,000 [1],[8],[11],[17],[20]                
Investment, interest rate, paid in kind [4],[7],[16],[19] 2.50%       2.50%   2.50%                    
Investment, Identifier [Axis]: Biolam Group, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 639,000 4,783,000     $ 639,000   $ 639,000   4,783,000                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 417,000     0   0   417,000                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 6,064,000 5,647,000     6,064,000   6,064,000   5,647,000       0        
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value $ 6,140,000 $ 9,147,000     $ 6,140,000   $ 6,140,000   $ 9,147,000       0        
Investment, interest rate, paid in kind 10.00% 10.00%     10.00%   10.00%   10.00%                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value $ 6,064,000 [4],[5],[7],[18],[40] $ 5,647,000 [1],[8],[9],[11],[26]     $ 6,064,000 [4],[5],[7],[18],[40]   $ 6,064,000 [4],[5],[7],[18],[40]   $ 5,647,000 [1],[8],[9],[11],[26]                
Cost 6,064,000 [4],[5],[7],[18],[40] 5,647,000 [1],[8],[9],[11],[26]     6,064,000 [4],[5],[7],[18],[40]   6,064,000 [4],[5],[7],[18],[40]   5,647,000 [1],[8],[9],[11],[26]                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 6,140,000 [5],[6],[7],[40] 9,147,000 [1],[9],[10],[11]     6,140,000 [5],[6],[7],[40]   6,140,000 [5],[6],[7],[40]   9,147,000 [1],[9],[10],[11]                
Cost $ 9,628,000 [5],[6],[7],[40] $ 9,628,000 [1],[9],[10],[11]     $ 9,628,000 [5],[6],[7],[40]   $ 9,628,000 [5],[6],[7],[40]   $ 9,628,000 [1],[9],[10],[11]                
Investment, interest rate, paid in kind 10.00% [5],[6],[7],[40] 10.00% [1],[9],[10],[11]     10.00% [5],[6],[7],[40]   10.00% [5],[6],[7],[40]   10.00% [1],[9],[10],[11]                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value $ 0 [5],[7],[13],[40] $ 0 [1],[9],[11],[14]     $ 0 [5],[7],[13],[40]   $ 0 [5],[7],[13],[40]   $ 0 [1],[9],[11],[14]                
Cost 0 [5],[7],[13],[40] 0 [1],[9],[11],[14]     0 [5],[7],[13],[40]   0 [5],[7],[13],[40]   0 [1],[9],[11],[14]                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 0 0     0   0   0       0        
Investment, Identifier [Axis]: Bounteous, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,840,000 2,840,000     2,840,000   2,840,000   2,840,000                
Investment, Identifier [Axis]: Bounteous, Inc., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,671,000 [2],[4],[7] 1,735,000 [1],[8],[11],[12]     1,671,000 [2],[4],[7]   1,671,000 [2],[4],[7]   1,735,000 [1],[8],[11],[12]                
Cost 1,814,000 [2],[4],[7] 1,816,000 [1],[8],[11],[12]     1,814,000 [2],[4],[7]   1,814,000 [2],[4],[7]   1,816,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Municipal Revenue Bond                                  
Schedule of Investments [Line Items]                                  
Fair value 28,425,000 28,300,000 [1]     28,425,000   28,425,000   28,300,000 [1]                
Cost 27,200,000 27,200,000 [1]     27,200,000   27,200,000   27,200,000 [1]                
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Preferred Stock- Series C                                  
Schedule of Investments [Line Items]                                  
Fair value 15,414,000 [7] 14,731,000 [1],[11]     15,414,000 [7]   15,414,000 [7]   14,731,000 [1],[11]                
Cost $ 14,992,000 [7] $ 14,460,000 [1],[11]     $ 14,992,000 [7]   $ 14,992,000 [7]   $ 14,460,000 [1],[11]                
Investment, interest rate, paid in kind 7.00% [7] 7.00% [1],[11]     7.00% [7]   7.00% [7]   7.00% [1],[11]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 4,538,000 [2],[4],[7] $ 4,724,000 [1],[8],[11],[12]     $ 4,538,000 [2],[4],[7]   $ 4,538,000 [2],[4],[7]   $ 4,724,000 [1],[8],[11],[12]                
Cost 4,683,000 [2],[4],[7] 4,728,000 [1],[8],[11],[12]     4,683,000 [2],[4],[7]   4,683,000 [2],[4],[7]   4,728,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, LLC units                                  
Schedule of Investments [Line Items]                                  
Fair value 930,000 [7],[13] 1,152,000 [1],[11],[14]     930,000 [7],[13]   930,000 [7],[13]   1,152,000 [1],[11],[14]                
Cost 1,107,000 [7],[13] 1,108,000 [1],[11],[14]     1,107,000 [7],[13]   1,107,000 [7],[13]   1,108,000 [1],[11],[14]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 835,000 [2],[4],[7] (12,000) [1],[8],[11],[12]     835,000 [2],[4],[7]   835,000 [2],[4],[7]   (12,000) [1],[8],[11],[12]                
Cost 877,000 [2],[4],[7] (11,000) [1],[8],[11],[12]     877,000 [2],[4],[7]   877,000 [2],[4],[7]   (11,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: BrightSign LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 443,000 1,329,000     443,000   443,000   1,329,000                
Investment, Identifier [Axis]: Brightline Trains Florida LLC, Transportation, Senior Secured Note                                  
Schedule of Investments [Line Items]                                  
Fair value 4,525,000 [7] 4,350,000 [1],[11]     4,525,000 [7]   4,525,000 [7]   4,350,000 [1],[11]                
Cost 5,000,000 [7] 5,000,000 [1],[11]     5,000,000 [7]   5,000,000 [7]   5,000,000 [1],[11]                
Investment, Identifier [Axis]: Brightpay Limited, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 134,000 135,000     134,000   134,000   135,000                
Investment, Identifier [Axis]: Brightpay Limited, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,152,000 [4],[7],[16],[19] 2,156,000 [1],[8],[11],[17],[20]     2,152,000 [4],[7],[16],[19]   2,152,000 [4],[7],[16],[19]   2,156,000 [1],[8],[11],[17],[20]                
Cost 2,301,000 [4],[7],[16],[19] 2,296,000 [1],[8],[11],[17],[20]     2,301,000 [4],[7],[16],[19]   2,301,000 [4],[7],[16],[19]   2,296,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: British Airways 2020-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                                  
Schedule of Investments [Line Items]                                  
Fair value 633,000 692,000 [1]     633,000   633,000   692,000 [1]                
Cost 622,000 703,000 [1]     622,000   622,000   703,000 [1]                
Investment, Identifier [Axis]: British Engineering Services Holdco Limited, Commercial Services & Supplies, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 13,755,000 [4],[7],[16],[35] 13,454,000 [1],[8],[11],[17],[31]     13,755,000 [4],[7],[16],[35]   13,755,000 [4],[7],[16],[35]   13,454,000 [1],[8],[11],[17],[31]                
Cost 15,174,000 [4],[7],[16],[35] 15,133,000 [1],[8],[11],[17],[31]     15,174,000 [4],[7],[16],[35]   15,174,000 [4],[7],[16],[35]   15,133,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: Brook & Whittle Holding Corp., Containers, Packaging & Glass, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,512,000 [2],[4],[5] 2,478,000 [1],[8],[9],[15]     2,512,000 [2],[4],[5]   2,512,000 [2],[4],[5]   2,478,000 [1],[8],[9],[15]                
Cost 2,786,000 [2],[4],[5] 2,807,000 [1],[8],[9],[15]     2,786,000 [2],[4],[5]   2,786,000 [2],[4],[5]   2,807,000 [1],[8],[9],[15]                
Investment, Identifier [Axis]: Brown Machine Group Holdings, LLC, Industrial Equipment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,155,000 [2],[4],[7] 6,281,000 [1],[8],[11],[12]     6,155,000 [2],[4],[7]   6,155,000 [2],[4],[7]   6,281,000 [1],[8],[11],[12]                
Cost 6,264,000 [2],[4],[7] 6,252,000 [1],[8],[11],[12]     6,264,000 [2],[4],[7]   6,264,000 [2],[4],[7]   6,252,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value 498,000 [7],[13] 446,000 [1],[11],[14]     498,000 [7],[13]   498,000 [7],[13]   446,000 [1],[11],[14]                
Cost 455,000 [7],[13] 455,000 [1],[11],[14]     455,000 [7],[13]   455,000 [7],[13]   455,000 [1],[11],[14]                
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,550,000 [4],[7],[18] 4,390,000 [1],[8],[11],[23]     4,550,000 [4],[7],[18]   4,550,000 [4],[7],[18]   4,390,000 [1],[8],[11],[23]                
Cost 4,383,000 [4],[7],[18] 4,370,000 [1],[8],[11],[23]     4,383,000 [4],[7],[18]   4,383,000 [4],[7],[18]   4,370,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: CATAWBA RIVER LIMITED, Finance Companies, Structured - Junior Note                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[17]   5,239,000             5,239,000                
Cost [1],[11],[17]   4,893,000             4,893,000                
Investment, Identifier [Axis]: CAi Software, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 943,000 943,000     943,000   943,000   943,000                
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 4,638,000 [2],[4],[7] 1,341,000 [1],[8],[11],[12]     4,638,000 [2],[4],[7]   4,638,000 [2],[4],[7]   1,341,000 [1],[8],[11],[12]                
Cost 4,893,000 [2],[4],[7] 1,352,000 [1],[8],[11],[12]     4,893,000 [2],[4],[7]   4,893,000 [2],[4],[7]   1,352,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 1,275,000 [2],[4],[7] 4,879,000 [1],[8],[11],[12]     1,275,000 [2],[4],[7]   1,275,000 [2],[4],[7]   4,879,000 [1],[8],[11],[12]                
Cost 1,345,000 [2],[4],[7] 4,921,000 [1],[8],[11],[12]     1,345,000 [2],[4],[7]   1,345,000 [2],[4],[7]   4,921,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: CAi Software, LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (63,000) [2],[4],[7],[24] (24,000) [1],[8],[11],[12]     (63,000) [2],[4],[7],[24]   (63,000) [2],[4],[7],[24]   (24,000) [1],[8],[11],[12]                
Cost (14,000) [2],[4],[7],[24] (16,000) [1],[8],[11],[12]     (14,000) [2],[4],[7],[24]   (14,000) [2],[4],[7],[24]   (16,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 20,869,000 [2],[4],[7] 10,377,000 [1],[8],[11],[26]     20,869,000 [2],[4],[7]   20,869,000 [2],[4],[7]   10,377,000 [1],[8],[11],[26]                
Cost 20,923,000 [2],[4],[7] 10,510,000 [1],[8],[11],[26]     20,923,000 [2],[4],[7]   20,923,000 [2],[4],[7]   10,510,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 1,341,000 [2],[4],[7] 1,344,000 [1],[8],[11],[15]     1,341,000 [2],[4],[7]   1,341,000 [2],[4],[7]   1,344,000 [1],[8],[11],[15]                
Cost 1,339,000 [2],[4],[7] 1,344,000 [1],[8],[11],[15]     1,339,000 [2],[4],[7]   1,339,000 [2],[4],[7]   1,344,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 1,164,000 [7],[13] 1,027,000 [1],[11],[14]     1,164,000 [7],[13]   1,164,000 [7],[13]   1,027,000 [1],[11],[14]                
Cost 722,000 [7],[13] 551,000 [1],[11],[14]     722,000 [7],[13]   722,000 [7],[13]   551,000 [1],[11],[14]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (41,000) [2],[4],[7],[24] (49,000) [1],[8],[11],[26]     (41,000) [2],[4],[7],[24]   (41,000) [2],[4],[7],[24]   (49,000) [1],[8],[11],[26]                
Cost (25,000) [2],[4],[7],[24] (29,000) [1],[8],[11],[26]     (25,000) [2],[4],[7],[24]   (25,000) [2],[4],[7],[24]   (29,000) [1],[8],[11],[26]                
Investment, Identifier [Axis]: CGI Parent, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,653,000 1,653,000     1,653,000   1,653,000   1,653,000                
Investment, Identifier [Axis]: CM Acquisitions Holdings Inc., Internet & Direct Marketing, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 18,314,000 [2],[4],[7] 18,060,000 [1],[8],[11],[15]     18,314,000 [2],[4],[7]   18,314,000 [2],[4],[7]   18,060,000 [1],[8],[11],[15]                
Cost 18,661,000 [2],[4],[7] 18,761,000 [1],[8],[11],[15]     18,661,000 [2],[4],[7]   18,661,000 [2],[4],[7]   18,761,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,727,000 [4],[7],[18] 3,928,000 [1],[8],[11],[12]     3,727,000 [4],[7],[18]   3,727,000 [4],[7],[18]   3,928,000 [1],[8],[11],[12]                
Cost $ 4,108,000 [4],[7],[18] 4,076,000 [1],[8],[11],[12]     $ 4,108,000 [4],[7],[18]   $ 4,108,000 [4],[7],[18]   4,076,000 [1],[8],[11],[12]                
Investment, interest rate, paid in kind [4],[7],[18] 0.30%       0.30%   0.30%                    
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] $ 659,000       $ 659,000   $ 659,000                    
Cost [4],[7],[18] $ 659,000       $ 659,000   $ 659,000                    
Investment, interest rate, paid in kind [4],[7],[18] 0.30%       0.30%   0.30%                    
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, Incremental Equity                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] $ 154,000       $ 154,000   $ 154,000                    
Cost [7],[13] 154,000       154,000   154,000                    
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 38,000 [7],[13] 165,000 [1],[11]     38,000 [7],[13]   38,000 [7],[13]   165,000 [1],[11]                
Cost 352,000 [7],[13] 352,000 [1],[11]     352,000 [7],[13]   352,000 [7],[13]   352,000 [1],[11]                
Investment, Identifier [Axis]: CSL DualCom, Tele-communications, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,964,000 [4],[7],[16],[41] 1,921,000 [1],[8],[11],[17],[42]     1,964,000 [4],[7],[16],[41]   1,964,000 [4],[7],[16],[41]   1,921,000 [1],[8],[11],[17],[42]                
Cost 1,911,000 [4],[7],[16],[41] 1,905,000 [1],[8],[11],[17],[42]     1,911,000 [4],[7],[16],[41]   1,911,000 [4],[7],[16],[41]   1,905,000 [1],[8],[11],[17],[42]                
Investment, Identifier [Axis]: CSL Dualcom, Capex / Acquisition Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 144,000 142,000     144,000   144,000   142,000                
Investment, Identifier [Axis]: CT Technologies Intermediate Holdings, Inc., Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,675,000 [4],[5],[18] 4,505,000 [1],[8],[9],[26]     4,675,000 [4],[5],[18]   4,675,000 [4],[5],[18]   4,505,000 [1],[8],[9],[26]                
Cost 4,892,000 [4],[5],[18] 4,930,000 [1],[8],[9],[26]     4,892,000 [4],[5],[18]   4,892,000 [4],[5],[18]   4,930,000 [1],[8],[9],[26]                
Investment, Identifier [Axis]: CVL 3, Capital Equipment, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 900,000 [4],[7],[16],[19] 891,000 [1],[8],[11],[17],[20]     900,000 [4],[7],[16],[19]   900,000 [4],[7],[16],[19]   891,000 [1],[8],[11],[17],[20]                
Cost 941,000 [4],[7],[16],[19] 938,000 [1],[8],[11],[17],[20]     941,000 [4],[7],[16],[19]   941,000 [4],[7],[16],[19]   938,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: CVL 3, Capital Equipment, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 1,142,000 [2],[4],[7],[16] 1,122,000 [1],[8],[11],[15],[17]     1,142,000 [2],[4],[7],[16]   1,142,000 [2],[4],[7],[16]   1,122,000 [1],[8],[11],[15],[17]                
Cost 1,119,000 [2],[4],[7],[16] 1,117,000 [1],[8],[11],[15],[17]     1,119,000 [2],[4],[7],[16]   1,119,000 [2],[4],[7],[16]   1,117,000 [1],[8],[11],[15],[17]                
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] 2,761,000       2,761,000   2,761,000                    
Cost [4],[7],[18] 2,730,000       2,730,000   2,730,000                    
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 301,000 [7],[13] 204,000 [1],[11],[14]     301,000 [7],[13]   301,000 [7],[13]   204,000 [1],[11],[14]                
Cost 161,000 [7],[13] 161,000 [1],[11],[14]     161,000 [7],[13]   161,000 [7],[13]   161,000 [1],[11],[14]                
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries,First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[26]   2,766,000             2,766,000                
Cost [1],[8],[11],[26]   2,744,000             2,744,000                
Investment, Identifier [Axis]: Cadent, LLC (f/k/a Cross MediaWorks), Media & Entertainment, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   6,580,000             6,580,000                
Cost [1],[8],[11],[12]   6,741,000             6,741,000                
Investment, Identifier [Axis]: Cadent, LLC (f/k/a Cross MediaWorks), Media & Entertainment, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   11,080,000             11,080,000                
Cost [1],[8],[11],[12]   11,161,000             11,161,000                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 110,000     0   0   110,000                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class A Equity                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14],[17]   292,000             292,000                
Cost 389,000 [7],[13],[16] 389,000 [1],[11],[14],[17]     389,000 [7],[13],[16]   389,000 [7],[13],[16]   389,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class C - Warrants                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14],[17]   0             0                
Cost [1],[11],[14],[17]   0             0                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,423,000 [4],[7],[16],[43] 1,468,000 [1],[8],[11],[17],[44]     1,423,000 [4],[7],[16],[43]   1,423,000 [4],[7],[16],[43]   1,468,000 [1],[8],[11],[17],[44]                
Cost $ 1,824,000 [4],[7],[16],[43] 1,729,000 [1],[8],[11],[17],[44]     $ 1,824,000 [4],[7],[16],[43]   $ 1,824,000 [4],[7],[16],[43]   1,729,000 [1],[8],[11],[17],[44]                
Investment, interest rate, paid in kind [4],[7],[16],[43] 9.00%       9.00%   9.00%                    
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 4,210,000 [2],[4],[7],[16] 4,269,000 [1],[8],[11],[15],[17]     $ 4,210,000 [2],[4],[7],[16]   $ 4,210,000 [2],[4],[7],[16]   4,269,000 [1],[8],[11],[15],[17]                
Cost 4,270,000 [2],[4],[7],[16] 4,261,000 [1],[8],[11],[15],[17]     4,270,000 [2],[4],[7],[16]   4,270,000 [2],[4],[7],[16]   4,261,000 [1],[8],[11],[15],[17]                
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 644,000 [7],[13],[16] 627,000 [1],[11],[14],[17]     644,000 [7],[13],[16]   644,000 [7],[13],[16]   627,000 [1],[11],[14],[17]                
Cost 682,000 [7],[13],[16] 682,000 [1],[11],[14],[17]     682,000 [7],[13],[16]   682,000 [7],[13],[16]   682,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units - Class X Equity                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13],[16] 35,000       35,000   35,000                    
Cost [7],[13],[16] 35,000       35,000   35,000                    
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[14]   1,339,000             1,339,000                
Cost [1],[14]   4,194,000             4,194,000                
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, First Lien Senior Secured Note                                  
Schedule of Investments [Line Items]                                  
Fair value [1]   5,113,000             5,113,000                
Cost [1]   5,720,000             5,720,000                
Investment, Identifier [Axis]: Catawba River Limited, Finance Companies, Structured - Junior Note                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[16] 3,390,000       3,390,000   3,390,000                    
Cost [7],[16] 4,974,000       4,974,000   4,974,000                    
Investment, Identifier [Axis]: Catawba River Limited, Structured Junior Note                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 12,800,000 12,635,000     12,800,000   12,800,000   12,635,000                
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Diversified Financial Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 3,057,000 [4],[7],[16],[19] 820,000 [1],[8],[11],[17],[20]     3,057,000 [4],[7],[16],[19]   3,057,000 [4],[7],[16],[19]   820,000 [1],[8],[11],[17],[20]                
Cost 2,919,000 [4],[7],[16],[19] 768,000 [1],[8],[11],[17],[20]     2,919,000 [4],[7],[16],[19]   2,919,000 [4],[7],[16],[19]   768,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Diversified Financial Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[20]   1,158,000             1,158,000                
Cost [1],[8],[11],[17],[20]   1,151,000             1,151,000                
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Incremental CAF Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 1,028,000     0   0   1,028,000                
Investment, Identifier [Axis]: Ceres Pharma NV, Pharma-ceuticals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,206,000 [4],[7],[16],[32] 3,139,000 [1],[8],[11],[17],[29]     3,206,000 [4],[7],[16],[32]   3,206,000 [4],[7],[16],[32]   3,139,000 [1],[8],[11],[17],[29]                
Cost 3,274,000 [4],[7],[16],[32] 3,264,000 [1],[8],[11],[17],[29]     3,274,000 [4],[7],[16],[32]   3,274,000 [4],[7],[16],[32]   3,264,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Charming Charlie LLC, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       0        
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       0        
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       0        
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 3                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       0        
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 4                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       0        
Investment, Identifier [Axis]: Cineworld Group PLC, Leisure Products, Warrants                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14],[17]   0             0                
Cost 102,000 [7],[13],[16] 102,000 [1],[11],[14],[17]     102,000 [7],[13],[16]   102,000 [7],[13],[16]   102,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 5,991,000 [4],[7],[27] 6,189,000 [1],[8],[11],[26]     5,991,000 [4],[7],[27]   5,991,000 [4],[7],[27]   6,189,000 [1],[8],[11],[26]                
Cost 6,087,000 [4],[7],[27] 6,182,000 [1],[8],[11],[26]     6,087,000 [4],[7],[27]   6,087,000 [4],[7],[27]   6,182,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[27] 587,000       587,000   587,000                    
Cost [4],[7],[27] 595,000       595,000   595,000                    
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers,First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[26]   523,000             523,000                
Cost [1],[8],[11],[26]   522,000             522,000                
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 78,000     0   0   78,000                
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Delayed Draw Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 3,155,000 0     3,155,000   3,155,000   0                
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [3],[7] 15,618,000       15,618,000   15,618,000                    
Cost [3],[7] 15,573,000       15,573,000   15,573,000                    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 12,761,000 [3],[7],[13],[45],[46] 0     12,761,000 [3],[7],[13],[45],[46]   12,761,000 [3],[7],[13],[45],[46]   0                
Cost [3],[7],[13],[45],[46] 10,944,000       10,944,000   10,944,000                    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14]   10,729,000             10,729,000                
Cost [1],[11],[14]   9,093,000             9,093,000                
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, Subordinated Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11]   6,036,000             6,036,000                
Cost [1],[11]   $ 6,054,000             $ 6,054,000                
Investment, interest rate, paid in kind [1],[11]   10.00%             10.00%                
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, Subordinated Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11]   $ 15,528,000             $ 15,528,000                
Cost [1],[11]   15,509,000             15,509,000                
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [3],[7] 6,526,000       6,526,000   6,526,000                    
Cost [3],[7] $ 6,560,000       $ 6,560,000   $ 6,560,000                    
Investment, interest rate, paid in kind [3],[7] 10.00%       10.00%   10.00%                    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value $ 15,618,000 0     $ 15,618,000   $ 15,618,000   0                
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value $ 6,526,000 0     $ 6,526,000   $ 6,526,000   0                
Investment, interest rate, paid in kind 10.00%       10.00%   10.00%                    
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, Diversified Manufacturing                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12],[17]   1,270,000             1,270,000                
Cost [1],[8],[11],[12],[17]   1,276,000             1,276,000                
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[16] $ 1,292,000       $ 1,292,000   $ 1,292,000                    
Cost [2],[4],[7],[16] 1,280,000       1,280,000   1,280,000                    
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, Class B Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 223,000 [7],[13] 196,000 [1],[11],[14]     223,000 [7],[13]   223,000 [7],[13]   196,000 [1],[11],[14]                
Cost 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 13,345,000 [4],[7],[18] 13,302,000 [1],[8],[11],[23]     13,345,000 [4],[7],[18]   13,345,000 [4],[7],[18]   13,302,000 [1],[8],[11],[23]                
Cost 13,255,000 [4],[7],[18] 13,316,000 [1],[8],[11],[23]     13,255,000 [4],[7],[18]   13,255,000 [4],[7],[18]   13,316,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 140,000 [7],[13] 159,000 [1],[11],[14]     140,000 [7],[13]   140,000 [7],[13]   159,000 [1],[11],[14]                
Cost 125,000 [7],[13] 125,000 [1],[11],[14]     125,000 [7],[13]   125,000 [7],[13]   125,000 [1],[11],[14]                
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, Senior Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 619,000 [7] 369,000 [1],[11]     619,000 [7]   619,000 [7]   369,000 [1],[11]                
Cost $ 628,000 [7] $ 371,000 [1],[11]     $ 628,000 [7]   $ 628,000 [7]   $ 371,000 [1],[11]                
Investment, interest rate, paid in kind 1.00% [7] 1.00% [1],[11]     1.00% [7]   1.00% [7]   1.00% [1],[11]                
Investment, Identifier [Axis]: Comply365, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 1,100,000 $ 935,000     $ 1,100,000   $ 1,100,000   $ 935,000                
Investment, Identifier [Axis]: Comply365, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 13,126,000 [2],[4],[7] 13,446,000 [1],[8],[11],[25]     13,126,000 [2],[4],[7]   13,126,000 [2],[4],[7]   13,446,000 [1],[8],[11],[25]                
Cost 13,051,000 [2],[4],[7] 13,407,000 [1],[8],[11],[25]     13,051,000 [2],[4],[7]   13,051,000 [2],[4],[7]   13,407,000 [1],[8],[11],[25]                
Investment, Identifier [Axis]: Comply365, LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (11,000) [2],[4],[7],[24] 148,000 [1],[8],[11],[25]     (11,000) [2],[4],[7],[24]   (11,000) [2],[4],[7],[24]   148,000 [1],[8],[11],[25]                
Cost (17,000) [2],[4],[7],[24] 146,000 [1],[8],[11],[25]     (17,000) [2],[4],[7],[24]   (17,000) [2],[4],[7],[24]   146,000 [1],[8],[11],[25]                
Investment, Identifier [Axis]: Contabo Finco S.À R.L, Internet Software & Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,851,000 [4],[7],[16],[19] 4,845,000 [1],[8],[11],[17],[20]     4,851,000 [4],[7],[16],[19]   4,851,000 [4],[7],[16],[19]   4,845,000 [1],[8],[11],[17],[20]                
Cost 4,535,000 [4],[7],[16],[19] 4,524,000 [1],[8],[11],[17],[20]     4,535,000 [4],[7],[16],[19]   4,535,000 [4],[7],[16],[19]   4,524,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 66,000 [13] 7,000 [1],[14]     66,000 [13]   66,000 [13]   7,000 [1],[14]                
Cost 296,000 [13] 296,000 [1],[14]     296,000 [13]   296,000 [13]   296,000 [1],[14]                
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 22,976,000 [6],[7] 11,118,000 [1],[10],[11]     22,976,000 [6],[7]   22,976,000 [6],[7]   11,118,000 [1],[10],[11]                
Cost 29,619,000 [6],[7] 29,619,000 [1],[10],[11]     29,619,000 [6],[7]   29,619,000 [6],[7]   29,619,000 [1],[10],[11]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 416,000 419,000     416,000   416,000   419,000                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class A Units                                  
Schedule of Investments [Line Items]                                  
Fair value 201,000 [7],[13],[16] 196,000 [1],[11],[14],[17]     201,000 [7],[13],[16]   201,000 [7],[13],[16]   196,000 [1],[11],[14],[17]                
Cost 205,000 [7],[13],[16] 205,000 [1],[11],[14],[17]     205,000 [7],[13],[16]   205,000 [7],[13],[16]   205,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class B Units                                  
Schedule of Investments [Line Items]                                  
Fair value 538,000 [7],[13],[16] 497,000 [1],[11],[14],[17]     538,000 [7],[13],[16]   538,000 [7],[13],[16]   497,000 [1],[11],[14],[17]                
Cost 446,000 [7],[13],[16] 446,000 [1],[11],[14],[17]     446,000 [7],[13],[16]   446,000 [7],[13],[16]   446,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,276,000 [4],[7],[16],[32] 4,233,000 [1],[8],[11],[17],[29]     4,276,000 [4],[7],[16],[32]   4,276,000 [4],[7],[16],[32]   4,233,000 [1],[8],[11],[17],[29]                
Cost $ 4,659,000 [4],[7],[16],[32] $ 4,638,000 [1],[8],[11],[17],[29]     $ 4,659,000 [4],[7],[16],[32]   $ 4,659,000 [4],[7],[16],[32]   $ 4,638,000 [1],[8],[11],[17],[29]                
Investment, interest rate, paid in kind 3.50% [4],[7],[16],[32] 3.50% [1],[8],[11],[17],[29]     3.50% [4],[7],[16],[32]   3.50% [4],[7],[16],[32]   3.50% [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Custom Alloy Corporation, Manufacturer of Pipe Fittings & Forgings, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[10],[11],[47]   $ 189,000             $ 189,000                
Cost [1],[10],[11],[47]   $ 4,222,000             $ 4,222,000                
Investment, interest rate, paid in kind [1],[10],[11],[47]   15.00%             15.00%                
Investment, Identifier [Axis]: Custom Alloy Corporation, Manufacturer of Pipe Fittings & Forgings, Second Lien Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[10],[11],[47]   $ 1,997,000             $ 1,997,000                
Cost [1],[10],[11],[47]   $ 42,162,000             $ 42,162,000                
Investment, interest rate, paid in kind [1],[10],[11],[47]   15.00%             15.00%                
Investment, Identifier [Axis]: DISA Holdings Corp., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 1,287,000 $ 1,368,000     $ 1,287,000   $ 1,287,000   $ 1,368,000                
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,743,000 [4],[7],[18] 5,491,000 [1],[8],[11],[23]     5,743,000 [4],[7],[18]   5,743,000 [4],[7],[18]   5,491,000 [1],[8],[11],[23]                
Cost 5,559,000 [4],[7],[18] 5,496,000 [1],[8],[11],[23]     5,559,000 [4],[7],[18]   5,559,000 [4],[7],[18]   5,496,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 64,000 [4],[7],[18] 0 [1],[8],[11],[23]     64,000 [4],[7],[18]   64,000 [4],[7],[18]   0 [1],[8],[11],[23]                
Cost 53,000 [4],[7],[18] 0 [1],[8],[11],[23]     53,000 [4],[7],[18]   53,000 [4],[7],[18]   0 [1],[8],[11],[23]                
Investment, Identifier [Axis]: DISA Holdings Corp., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 364,000 416,000     364,000   364,000   416,000                
Investment, Identifier [Axis]: DataOnline Corp., High Tech Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 14,293,000 [2],[4],[5],[7] 14,259,000 [1],[8],[9],[11],[12]     14,293,000 [2],[4],[5],[7]   14,293,000 [2],[4],[5],[7]   14,259,000 [1],[8],[9],[11],[12]                
Cost 14,437,000 [2],[4],[5],[7] 14,550,000 [1],[8],[9],[11],[12]     14,437,000 [2],[4],[5],[7]   14,437,000 [2],[4],[5],[7]   14,550,000 [1],[8],[9],[11],[12]                
Investment, Identifier [Axis]: DataOnline Corp., High Tech Industries, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 2,121,000 [2],[4],[5],[7] 2,100,000 [1],[8],[9],[11],[12]     2,121,000 [2],[4],[5],[7]   2,121,000 [2],[4],[5],[7]   2,100,000 [1],[8],[9],[11],[12]                
Cost 2,143,000 [2],[4],[5],[7] 2,143,000 [1],[8],[9],[11],[12]     2,143,000 [2],[4],[5],[7]   2,143,000 [2],[4],[5],[7]   2,143,000 [1],[8],[9],[11],[12]                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 481,000 481,000     481,000   481,000   481,000                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,874,000 [2],[4],[7] 1,875,000 [1],[8],[11],[15]     1,874,000 [2],[4],[7]   1,874,000 [2],[4],[7]   1,875,000 [1],[8],[11],[15]                
Cost 1,866,000 [2],[4],[7] 1,876,000 [1],[8],[11],[15]     1,866,000 [2],[4],[7]   1,866,000 [2],[4],[7]   1,876,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 96,000 [7],[13] 96,000 [1],[11],[14]     96,000 [7],[13]   96,000 [7],[13]   96,000 [1],[11],[14]                
Cost 96,000 [7],[13] 96,000 [1],[11],[14]     96,000 [7],[13]   96,000 [7],[13]   96,000 [1],[11],[14]                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (8,000) [2],[4],[7],[24] (11,000) [1],[8],[11],[15]     (8,000) [2],[4],[7],[24]   (8,000) [2],[4],[7],[24]   (11,000) [1],[8],[11],[15]                
Cost (9,000) [2],[4],[7],[24] (10,000) [1],[8],[11],[15]     (9,000) [2],[4],[7],[24]   (9,000) [2],[4],[7],[24]   (10,000) [1],[8],[11],[15]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 41,000 [7],[13] 48,000 [1],[11],[14]     41,000 [7],[13]   41,000 [7],[13]   48,000 [1],[11],[14]                
Cost 55,000 [7],[13] 55,000 [1],[11],[14]     55,000 [7],[13]   55,000 [7],[13]   55,000 [1],[11],[14]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,122,000 [4],[7],[18] 690,000 [1],[8],[11],[26]     1,122,000 [4],[7],[18]   1,122,000 [4],[7],[18]   690,000 [1],[8],[11],[26]                
Cost 1,130,000 [4],[7],[18] 688,000 [1],[8],[11],[26]     1,130,000 [4],[7],[18]   1,130,000 [4],[7],[18]   688,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (10,000) [4],[7],[18],[24] (3,000) [1],[8],[11],[26]     (10,000) [4],[7],[18],[24]   (10,000) [4],[7],[18],[24]   (3,000) [1],[8],[11],[26]                
Cost (7,000) [4],[7],[18],[24] (3,000) [1],[8],[11],[26]     (7,000) [4],[7],[18],[24]   (7,000) [4],[7],[18],[24]   (3,000) [1],[8],[11],[26]                
Investment, Identifier [Axis]: DecksDirect, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 381,000 218,000     381,000   381,000   218,000                
Investment, Identifier [Axis]: Distinct Holdings, Inc., Systems Software, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,599,000 [2],[4],[7] 6,096,000 [1],[8],[11],[12]     6,599,000 [2],[4],[7]   6,599,000 [2],[4],[7]   6,096,000 [1],[8],[11],[12]                
Cost 6,743,000 [2],[4],[7] 6,860,000 [1],[8],[11],[12]     6,743,000 [2],[4],[7]   6,743,000 [2],[4],[7]   6,860,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[32] 2,615,000       2,615,000   2,615,000                    
Cost [4],[7],[16],[32] 2,826,000       2,826,000   2,826,000                    
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[20]   2,515,000             2,515,000                
Cost [1],[8],[11],[17],[20]   2,828,000             2,828,000                
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[29]   1,153,000             1,153,000                
Cost [1],[8],[11],[17],[29]   1,170,000             1,170,000                
Investment, Identifier [Axis]: DreamStart Bidco SAS (d/b/a SmartTrade), Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 579,000     0   0   579,000                
Investment, Identifier [Axis]: DreamStart Bidco SAS (d/b/a SmartTrade), Diversified Financial Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,252,000 [4],[7],[16],[19] 2,247,000 [1],[8],[11],[17],[20]     2,252,000 [4],[7],[16],[19]   2,252,000 [4],[7],[16],[19]   2,247,000 [1],[8],[11],[17],[20]                
Cost 2,321,000 [4],[7],[16],[19] 2,305,000 [1],[8],[11],[17],[20]     2,321,000 [4],[7],[16],[19]   2,321,000 [4],[7],[16],[19]   2,305,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Dryden 43 Senior Loan Fund, Series 2016-43A, Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value 1,672,000 [5],[16] 2,084,000 [1],[9],[17]     1,672,000 [5],[16]   1,672,000 [5],[16]   2,084,000 [1],[9],[17]                
Cost 2,138,000 [5],[16] 2,329,000 [1],[9],[17]     2,138,000 [5],[16]   2,138,000 [5],[16]   2,329,000 [1],[9],[17]                
Investment, Identifier [Axis]: Dryden 49 Senior Loan Fund, Series 2017-49A, Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value 2,764,000 [5],[16] 4,267,000 [1],[9],[17]     2,764,000 [5],[16]   2,764,000 [5],[16]   4,267,000 [1],[9],[17]                
Cost 5,338,000 [5],[16] 6,790,000 [1],[9],[17]     5,338,000 [5],[16]   5,338,000 [5],[16]   6,790,000 [1],[9],[17]                
Investment, Identifier [Axis]: Dune Group, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 420,000 624,000     420,000   420,000   624,000                
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 98,000 [4],[7],[16],[19] 111,000 [1],[8],[11],[17],[20]     98,000 [4],[7],[16],[19]   98,000 [4],[7],[16],[19]   111,000 [1],[8],[11],[17],[20]                
Cost 115,000 [4],[7],[16],[19] 109,000 [1],[8],[11],[17],[20]     115,000 [4],[7],[16],[19]   115,000 [4],[7],[16],[19]   109,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 1,370,000 [2],[4],[7],[16] 1,209,000 [1],[8],[11],[12],[17]     1,370,000 [2],[4],[7],[16]   1,370,000 [2],[4],[7],[16]   1,209,000 [1],[8],[11],[12],[17]                
Cost 1,418,000 [2],[4],[7],[16] 1,212,000 [1],[8],[11],[12],[17]     1,418,000 [2],[4],[7],[16]   1,418,000 [2],[4],[7],[16]   1,212,000 [1],[8],[11],[12],[17]                
Investment, Identifier [Axis]: Dunlipharder B.V., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 992,000 [2],[4],[7],[16] 988,000 [1],[8],[11],[15],[17]     992,000 [2],[4],[7],[16]   992,000 [2],[4],[7],[16]   988,000 [1],[8],[11],[15],[17]                
Cost 988,000 [2],[4],[7],[16] 986,000 [1],[8],[11],[15],[17]     988,000 [2],[4],[7],[16]   988,000 [2],[4],[7],[16]   986,000 [1],[8],[11],[15],[17]                
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 5,164,000 5,164,000     5,164,000   5,164,000   5,164,000                
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 9,457,000       9,457,000   9,457,000                    
Cost [2],[4],[7] 9,413,000       9,413,000   9,413,000                    
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   25,287,000             25,287,000                
Cost [1],[8],[11],[12]   25,257,000             25,257,000                
Investment, Identifier [Axis]: EFC International, Automotive, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 264,000       264,000   264,000                    
Cost [7],[13] 231,000       231,000   231,000                    
Investment, Identifier [Axis]: EFC International, Automotive, Senior Unsecured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [7] 757,000       757,000   757,000                    
Cost [7] $ 754,000       $ 754,000   $ 754,000                    
Investment, interest rate, paid in kind [7] 2.50%       2.50%   2.50%                    
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 9,272,000 9,272,000     $ 9,272,000   $ 9,272,000   9,272,000                
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 10,623,000 [4],[7],[27] 12,008,000 [1],[8],[11],[12]     10,623,000 [4],[7],[27]   10,623,000 [4],[7],[27]   12,008,000 [1],[8],[11],[12]                
Cost 12,243,000 [4],[7],[27] 12,272,000 [1],[8],[11],[12]     12,243,000 [4],[7],[27]   12,243,000 [4],[7],[27]   12,272,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 1,996,000 [4],[7],[27] 1,409,000 [1],[8],[11],[12]     1,996,000 [4],[7],[27]   1,996,000 [4],[7],[27]   1,409,000 [1],[8],[11],[12]                
Cost 2,219,000 [4],[7],[27] 1,446,000 [1],[8],[11],[12]     2,219,000 [4],[7],[27]   2,219,000 [4],[7],[27]   1,446,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 706,000 1,471,000     706,000   706,000   1,471,000                
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 257,000     0   0   257,000                
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Electrical Components & Equipment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,858,000 [2],[4],[7] 6,024,000 [1],[8],[11],[12]     5,858,000 [2],[4],[7]   5,858,000 [2],[4],[7]   6,024,000 [1],[8],[11],[12]                
Cost 5,947,000 [2],[4],[7] 5,978,000 [1],[8],[11],[12]     5,947,000 [2],[4],[7]   5,947,000 [2],[4],[7]   5,978,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Partnership Equity                                  
Schedule of Investments [Line Items]                                  
Fair value 576,000 [7],[13] 933,000 [1],[11],[14]     576,000 [7],[13]   576,000 [7],[13]   933,000 [1],[11],[14]                
Cost 531,000 [7],[13] 531,000 [1],[11],[14]     531,000 [7],[13]   531,000 [7],[13]   531,000 [1],[11],[14]                
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,261,000 [4],[7],[18] 9,100,000 [1],[8],[11],[12]     9,261,000 [4],[7],[18]   9,261,000 [4],[7],[18]   9,100,000 [1],[8],[11],[12]                
Cost 9,332,000 [4],[7],[18] 9,320,000 [1],[8],[11],[12]     9,332,000 [4],[7],[18]   9,332,000 [4],[7],[18]   9,320,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value                           $ 4,500,000      
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Revolver, Funded                                  
Schedule of Investments [Line Items]                                  
Fair value 4,700,000 5,300,000     4,700,000   4,700,000   5,300,000                
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Revolver, Unfunded                                  
Schedule of Investments [Line Items]                                  
Fair value                     $ 22,700,000     13,600,000      
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Second Lien Senior Secured Loan                                  
Schedule of Investments [Line Items]                                  
Fair value                           $ 89,800,000      
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 147,054,000 [3],[7] 135,066,000 [1],[11]     147,054,000 [3],[7]   147,054,000 [3],[7]   135,066,000 [1],[11]                
Cost 93,584,000 [3],[7] 93,230,000 [1],[11]     93,584,000 [3],[7]   93,584,000 [3],[7]   93,230,000 [1],[11]                
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 4,728,000 [3],[7],[18] 5,273,000 [1],[11],[26]     4,728,000 [3],[7],[18]   4,728,000 [3],[7],[18]   5,273,000 [1],[11],[26]                
Cost 4,634,000 [3],[7],[18] 5,165,000 [1],[11],[26]     4,634,000 [3],[7],[18]   4,634,000 [3],[7],[18]   5,165,000 [1],[11],[26]                
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,545,000 [3],[7] 4,545,000 [1],[11]     4,545,000 [3],[7]   4,545,000 [3],[7]   4,545,000 [1],[11]                
Cost 4,512,000 [3],[7] 4,508,000 [1],[11]     4,512,000 [3],[7]   4,512,000 [3],[7]   4,508,000 [1],[11]                
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, LLC units                                  
Schedule of Investments [Line Items]                                  
Fair value 147,054,000 135,066,000     147,054,000   147,054,000   135,066,000       92,668,000        
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 18,000,000 17,455,000     18,000,000   18,000,000   17,455,000                
Fair value 4,728,000 5,273,000     4,728,000   4,728,000   5,273,000       1,818,000        
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,545,000 4,545,000     4,545,000   4,545,000   4,545,000       4,738,000        
Investment, Identifier [Axis]: Ellkay, LLC, Healthcare and Pharmaceuticals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,572,000 [2],[4],[7] 4,893,000 [1],[8],[11],[12]     4,572,000 [2],[4],[7]   4,572,000 [2],[4],[7]   4,893,000 [1],[8],[11],[12]                
Cost 4,831,000 [2],[4],[7] 4,868,000 [1],[8],[11],[12]     4,831,000 [2],[4],[7]   4,831,000 [2],[4],[7]   4,868,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Entact Environmental Services, Inc., Environmental Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 7,111,000 [2],[4],[7] 5,529,000 [1],[8],[11],[12]     7,111,000 [2],[4],[7]   7,111,000 [2],[4],[7]   5,529,000 [1],[8],[11],[12]                
Cost 7,194,000 [2],[4],[7] 5,511,000 [1],[8],[11],[12]     7,194,000 [2],[4],[7]   7,194,000 [2],[4],[7]   5,511,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Delayed Draw Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,618,000 2,639,000     2,618,000   2,618,000   2,639,000                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Delayed Draw Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 524,000 528,000     524,000   524,000   528,000                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 1,126,000 [4],[7],[16],[19] 1,352,000 [1],[8],[11],[17],[20]     1,126,000 [4],[7],[16],[19]   1,126,000 [4],[7],[16],[19]   1,352,000 [1],[8],[11],[17],[20]                
Cost $ 1,386,000 [4],[7],[16],[19] 1,338,000 [1],[8],[11],[17],[20]     $ 1,386,000 [4],[7],[16],[19]   $ 1,386,000 [4],[7],[16],[19]   1,338,000 [1],[8],[11],[17],[20]                
Investment, interest rate, paid in kind 2.80%       2.80%   2.80%                    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value $ 721,000 [2],[4],[7],[16] 745,000 [1],[8],[11],[15],[17]     $ 721,000 [2],[4],[7],[16]   $ 721,000 [2],[4],[7],[16]   745,000 [1],[8],[11],[15],[17]                
Cost $ 763,000 [2],[4],[7],[16] 745,000 [1],[8],[11],[15],[17]     $ 763,000 [2],[4],[7],[16]   $ 763,000 [2],[4],[7],[16]   745,000 [1],[8],[11],[15],[17]                
Investment, interest rate, paid in kind [2] 2.80%       2.80%   2.80%                    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 3                                  
Schedule of Investments [Line Items]                                  
Fair value $ 2,069,000 [4],[7],[16],[30] 2,111,000 [1],[8],[11],[17],[31]     $ 2,069,000 [4],[7],[16],[30]   $ 2,069,000 [4],[7],[16],[30]   2,111,000 [1],[8],[11],[17],[31]                
Cost $ 2,207,000 [4],[7],[16],[30] 2,158,000 [1],[8],[11],[17],[31]     $ 2,207,000 [4],[7],[16],[30]   $ 2,207,000 [4],[7],[16],[30]   2,158,000 [1],[8],[11],[17],[31]                
Investment, interest rate, paid in kind [30] 2.80%       2.80%   2.80%                    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17]   513,000             513,000                
Cost [1],[8],[11],[17]   $ 507,000             $ 507,000                
Investment, interest rate, paid in kind [1],[8],[11],[17]   11.50%             11.50%                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Senior Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[16] $ 531,000       $ 531,000   $ 531,000                    
Cost [7],[16] $ 568,000       $ 568,000   $ 568,000                    
Investment, interest rate, paid in kind [7],[16] 11.50%       11.50%   11.50%                    
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 620,000 $ 640,000     $ 620,000   $ 620,000   $ 640,000                
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,467,000 [4],[7],[16],[48] 1,573,000 [1],[8],[11],[17],[49]     1,467,000 [4],[7],[16],[48]   1,467,000 [4],[7],[16],[48]   1,573,000 [1],[8],[11],[17],[49]                
Cost 1,862,000 [4],[7],[16],[48] 1,853,000 [1],[8],[11],[17],[49]     1,862,000 [4],[7],[16],[48]   1,862,000 [4],[7],[16],[48]   1,853,000 [1],[8],[11],[17],[49]                
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[48] 19,000       19,000   19,000                    
Cost [4],[7],[16],[48] 21,000       21,000   21,000                    
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,321,000 [2],[4],[7] 7,106,000 [1],[8],[11],[23]     6,321,000 [2],[4],[7]   6,321,000 [2],[4],[7]   7,106,000 [1],[8],[11],[23]                
Cost 6,298,000 [2],[4],[7] 7,092,000 [1],[8],[11],[23]     6,298,000 [2],[4],[7]   6,298,000 [2],[4],[7]   7,092,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 138,000 [2],[4],[7] 137,000 [1],[8],[11],[23]     138,000 [2],[4],[7]   138,000 [2],[4],[7]   137,000 [1],[8],[11],[23]                
Cost 137,000 [2],[4],[7] 136,000 [1],[8],[11],[23]     137,000 [2],[4],[7]   137,000 [2],[4],[7]   136,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 115,000 115,000     115,000   115,000   115,000                
Investment, Identifier [Axis]: F24 (Stairway BidCo GmbH), Acquisition Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 246,000     0   0   246,000                
Investment, Identifier [Axis]: F24 (Stairway BidCo Gmbh), Software Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,849,000 [4],[7],[16],[19] 1,644,000 [1],[8],[11],[17],[20]     1,849,000 [4],[7],[16],[19]   1,849,000 [4],[7],[16],[19]   1,644,000 [1],[8],[11],[17],[20]                
Cost 2,069,000 [4],[7],[16],[19] 1,792,000 [1],[8],[11],[17],[20]     2,069,000 [4],[7],[16],[19]   2,069,000 [4],[7],[16],[19]   1,792,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,772,000 [2],[4],[7] 6,767,000 [1],[8],[11],[26]     4,772,000 [2],[4],[7]   4,772,000 [2],[4],[7]   6,767,000 [1],[8],[11],[26]                
Cost 4,730,000 [2],[4],[7] 6,728,000 [1],[8],[11],[26]     4,730,000 [2],[4],[7]   4,730,000 [2],[4],[7]   6,728,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 14,000 [7],[13] 17,000 [1],[11],[14]     14,000 [7],[13]   14,000 [7],[13]   17,000 [1],[11],[14]                
Cost 12,000 [7],[13] 12,000 [1],[11],[14]     12,000 [7],[13]   12,000 [7],[13]   12,000 [1],[11],[14]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value 63,000 [7],[13] 75,000 [1],[11],[14]     63,000 [7],[13]   63,000 [7],[13]   75,000 [1],[11],[14]                
Cost 51,000 [7],[13] 51,000 [1],[11],[14]     51,000 [7],[13]   51,000 [7],[13]   51,000 [1],[11],[14]                
Investment, Identifier [Axis]: Faraday, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 949,000 0     949,000   949,000   0                
Investment, Identifier [Axis]: Faraday, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[19] 1,558,000       1,558,000   1,558,000                    
Cost [4],[7],[16],[19] 1,589,000       1,589,000   1,589,000                    
Investment, Identifier [Axis]: Ferrellgas L.P., Oil & Gas Equipment & Services, Opco Preferred Units                                  
Schedule of Investments [Line Items]                                  
Fair value 2,597,000 [7] 2,742,000 [1],[11]     2,597,000 [7]   2,597,000 [7]   2,742,000 [1],[11]                
Cost 2,799,000 [7] 2,799,000 [1],[11]     2,799,000 [7]   2,799,000 [7]   2,799,000 [1],[11]                
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings Inc., Business Equipment & Services, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 6,589,000 [7] 6,084,000 [1],[11]     6,589,000 [7]   6,589,000 [7]   6,084,000 [1],[11]                
Cost $ 8,338,000 [7] $ 7,892,000 [1],[11]     $ 8,338,000 [7]   $ 8,338,000 [7]   $ 7,892,000 [1],[11]                
Investment, interest rate, paid in kind 11.00% [7] 11.00% [1],[11]     11.00% [7]   11.00% [7]   11.00% [1],[11]                
Investment, Identifier [Axis]: Fineline Technologies, Inc., Consumer Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 1,280,000 [2],[4],[7] $ 1,270,000 [1],[8],[11],[12]     $ 1,280,000 [2],[4],[7]   $ 1,280,000 [2],[4],[7]   $ 1,270,000 [1],[8],[11],[12]                
Cost 1,269,000 [2],[4],[7] 1,274,000 [1],[8],[11],[12]     1,269,000 [2],[4],[7]   1,269,000 [2],[4],[7]   1,274,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Fineline Technologies, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 180,000     0   0   180,000                
Investment, Identifier [Axis]: Finexvet, Consumer Cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,042,000 [4],[7],[16],[32] 2,329,000 [1],[8],[11],[17],[29]     4,042,000 [4],[7],[16],[32]   4,042,000 [4],[7],[16],[32]   2,329,000 [1],[8],[11],[17],[29]                
Cost 4,161,000 [4],[7],[16],[32] 2,379,000 [1],[8],[11],[17],[29]     4,161,000 [4],[7],[16],[32]   4,161,000 [4],[7],[16],[32]   2,379,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Finexvet, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 623,000 0     623,000   623,000   0                
Investment, Identifier [Axis]: FitzMark Buyer, LLC, Cargo & Transportation, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,147,000 [2],[4],[7] 4,165,000 [1],[8],[11],[12]     4,147,000 [2],[4],[7]   4,147,000 [2],[4],[7]   4,165,000 [1],[8],[11],[12]                
Cost 4,135,000 [2],[4],[7] 4,164,000 [1],[8],[11],[12]     4,135,000 [2],[4],[7]   4,135,000 [2],[4],[7]   4,164,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 1,097,000 [7],[13] 962,000 [1],[11],[14]     1,097,000 [7],[13]   1,097,000 [7],[13]   962,000 [1],[11],[14]                
Cost 967,000 [7],[13] 967,000 [1],[11],[14]     967,000 [7],[13]   967,000 [7],[13]   967,000 [1],[11],[14]                
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 13,555,000 [2],[4],[7] 13,295,000 [1],[8],[11],[15]     13,555,000 [2],[4],[7]   13,555,000 [2],[4],[7]   13,295,000 [1],[8],[11],[15]                
Cost 13,454,000 [2],[4],[7] 13,434,000 [1],[8],[11],[15]     13,454,000 [2],[4],[7]   13,454,000 [2],[4],[7]   13,434,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Flexential Issuer, LLC, Information Technology, Structured Secured Note - Class C                                  
Schedule of Investments [Line Items]                                  
Fair value 13,522,000 13,827,000 [1]     13,522,000   13,522,000   13,827,000 [1]                
Cost 14,856,000 14,839,000 [1]     14,856,000   14,856,000   14,839,000 [1]                
Investment, Identifier [Axis]: Flywheel Re Segregated Portfolio 2022-4, Investment Funds, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 3,026,000 [7],[13],[16] 1,932,000 [1],[11],[14],[17]     3,026,000 [7],[13],[16]   3,026,000 [7],[13],[16]   1,932,000 [1],[11],[14],[17]                
Cost 2,828,000 [7],[13],[16] 1,922,000 [1],[11],[14],[17]     2,828,000 [7],[13],[16]   2,828,000 [7],[13],[16]   1,922,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Footco 40 Limited, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 502,000 766,000     502,000   502,000   766,000                
Investment, Identifier [Axis]: Footco 40 Limited, Media & Entertainment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,726,000 [4],[7],[16],[30] 1,437,000 [1],[8],[11],[17],[31]     1,726,000 [4],[7],[16],[30]   1,726,000 [4],[7],[16],[30]   1,437,000 [1],[8],[11],[17],[31]                
Cost 1,847,000 [4],[7],[16],[30] 1,561,000 [1],[8],[11],[17],[31]     1,847,000 [4],[7],[16],[30]   1,847,000 [4],[7],[16],[30]   1,561,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 210,000 925,000     210,000   210,000   925,000                
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Other Financial, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,262,000 [2],[4],[7] 1,513,000 [1],[8],[11],[23]     2,262,000 [2],[4],[7]   2,262,000 [2],[4],[7]   1,513,000 [1],[8],[11],[23]                
Cost 2,230,000 [2],[4],[7] 1,516,000 [1],[8],[11],[23]     2,230,000 [2],[4],[7]   2,230,000 [2],[4],[7]   1,516,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: FragilePak LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 2,354,000     0   0   2,354,000                
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,584,000 [2],[4],[7] 4,638,000 [1],[8],[11],[12]     4,584,000 [2],[4],[7]   4,584,000 [2],[4],[7]   4,638,000 [1],[8],[11],[12]                
Cost 4,519,000 [2],[4],[7] 4,491,000 [1],[8],[11],[12]     4,519,000 [2],[4],[7]   4,519,000 [2],[4],[7]   4,491,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 871,000 [7],[13] 1,179,000 [1],[11],[14]     871,000 [7],[13]   871,000 [7],[13]   1,179,000 [1],[11],[14]                
Cost 938,000 [7],[13] 938,000 [1],[11],[14]     938,000 [7],[13]   938,000 [7],[13]   938,000 [1],[11],[14]                
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 3,000 [13] 158,000 [1],[14]     3,000 [13]   3,000 [13]   158,000 [1],[14]                
Cost 370,000 [13] 320,000 [1],[14]     370,000 [13]   370,000 [13]   320,000 [1],[14]                
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,339,000 [2],[4],[7] 4,871,000 [1],[8],[11],[12]     4,339,000 [2],[4],[7]   4,339,000 [2],[4],[7]   4,871,000 [1],[8],[11],[12]                
Cost 4,095,000 [2],[4],[7] 4,089,000 [1],[8],[11],[12]     4,095,000 [2],[4],[7]   4,095,000 [2],[4],[7]   4,089,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, Super Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [7] 190,000       190,000   190,000                    
Cost [7] 190,000       190,000   190,000                    
Investment, Identifier [Axis]: Front Line Power Construction LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 95,000 0     95,000   95,000   0                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   16,271,000             16,271,000                
Cost [1],[8],[11],[15]   16,276,000             16,276,000                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14]   687,000             687,000                
Cost [1],[11],[14]   687,000             687,000                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   (77,000)             (77,000)                
Cost [1],[8],[11],[15]   (76,000)             (76,000)                
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 10,399,000       10,399,000   10,399,000                    
Cost [2],[4],[7] 10,359,000       10,359,000   10,359,000                    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 633,000       633,000   633,000                    
Cost [7],[13] 687,000       687,000   687,000                    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] (60,000)       (60,000)   (60,000)                    
Cost [2],[4],[7],[24] (67,000)       (67,000)   (67,000)                    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,581,000 2,581,000     2,581,000   2,581,000   2,581,000                
Investment, Identifier [Axis]: GPNZ II GmbH, CAF Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 560,000     0   0   560,000                
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13],[16] 0       0   0                    
Cost [7],[13],[16] 0       0   0                    
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[33]   375,000             375,000                
Cost [1],[8],[11],[17],[33]   429,000             429,000                
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[50] 325,000       325,000   325,000                    
Cost [4],[7],[16],[50] 445,000       445,000   445,000                    
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[16] 34,000       34,000   34,000                    
Cost [7],[16] $ 35,000       $ 35,000   $ 35,000                    
Investment, interest rate, paid in kind [7],[16] 10.00%       10.00%   10.00%                    
Investment, Identifier [Axis]: GPNZ II GmbH, Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 59,000 0     $ 59,000   $ 59,000   0                
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Second Lien Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[47]   10,442,000             10,442,000                
Cost [1],[11],[47]   $ 10,587,000             $ 10,587,000                
Investment, interest rate, paid in kind [1],[11],[47]   1.00%             1.00%                
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Series A Preferred Units                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14],[47]   $ 2,252,000             $ 2,252,000                
Cost [1],[11],[14],[47]   2,166,000             2,166,000                
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Series C Preferred Units                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14],[47]   2,158,000             2,158,000                
Cost [1],[11],[14],[47]   1,081,000             1,081,000                
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 2,372,000 [4],[7],[16],[36] 2,438,000 [1],[8],[11],[17],[49]     2,372,000 [4],[7],[16],[36]   2,372,000 [4],[7],[16],[36]   2,438,000 [1],[8],[11],[17],[49]                
Cost 2,547,000 [4],[7],[16],[36] 2,502,000 [1],[8],[11],[17],[49]     2,547,000 [4],[7],[16],[36]   2,547,000 [4],[7],[16],[36]   2,502,000 [1],[8],[11],[17],[49]                
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 4,065,000 [4],[7],[16],[51] 4,242,000 [1],[8],[11],[17],[52]     4,065,000 [4],[7],[16],[51]   4,065,000 [4],[7],[16],[51]   4,242,000 [1],[8],[11],[17],[52]                
Cost 4,222,000 [4],[7],[16],[51] 4,202,000 [1],[8],[11],[17],[52]     4,222,000 [4],[7],[16],[51]   4,222,000 [4],[7],[16],[51]   4,202,000 [1],[8],[11],[17],[52]                
Investment, Identifier [Axis]: Global Academic Group Limited, Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 393,000 451,000     393,000   393,000   451,000                
Investment, Identifier [Axis]: Greenhill II BV, Capex Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 115,000 255,000     115,000   115,000   255,000                
Investment, Identifier [Axis]: Greenhill II BV, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 854,000 [4],[7],[16],[19] 716,000 [1],[8],[11],[17],[20]     854,000 [4],[7],[16],[19]   854,000 [4],[7],[16],[19]   716,000 [1],[8],[11],[17],[20]                
Cost 814,000 [4],[7],[16],[19] 672,000 [1],[8],[11],[17],[20]     814,000 [4],[7],[16],[19]   814,000 [4],[7],[16],[19]   672,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Groupe Product Life, Consumer Non-cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,039,000 [4],[7],[16],[19] 598,000 [1],[8],[11],[17],[20]     1,039,000 [4],[7],[16],[19]   1,039,000 [4],[7],[16],[19]   598,000 [1],[8],[11],[17],[20]                
Cost 1,005,000 [4],[7],[16],[19] 553,000 [1],[8],[11],[17],[20]     1,005,000 [4],[7],[16],[19]   1,005,000 [4],[7],[16],[19]   553,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Groupe Product Life, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 441,000     0   0   441,000                
Investment, Identifier [Axis]: Gulf Finance, LLC, Oil & Gas Exploration & Production, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 820,000 [4],[18] 772,000 [1],[8],[26]     820,000 [4],[18]   820,000 [4],[18]   772,000 [1],[8],[26]                
Cost 792,000 [4],[18] 797,000 [1],[8],[26]     792,000 [4],[18]   792,000 [4],[18]   797,000 [1],[8],[26]                
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 212,000 223,000     212,000   212,000   223,000                
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd., Consumer Non-Cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,054,000 [4],[7],[16],[36] 2,136,000 [1],[8],[11],[17],[37]     2,054,000 [4],[7],[16],[36]   2,054,000 [4],[7],[16],[36]   2,136,000 [1],[8],[11],[17],[37]                
Cost 2,023,000 [4],[7],[16],[36] 2,016,000 [1],[8],[11],[17],[37]     2,023,000 [4],[7],[16],[36]   2,023,000 [4],[7],[16],[36]   2,016,000 [1],[8],[11],[17],[37]                
Investment, Identifier [Axis]: HEKA Invest, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 551,000 555,000     551,000   551,000   555,000                
Investment, Identifier [Axis]: HEKA Invest, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,860,000 [4],[7],[16],[19] 4,846,000 [1],[8],[11],[17],[20]     4,860,000 [4],[7],[16],[19]   4,860,000 [4],[7],[16],[19]   4,846,000 [1],[8],[11],[17],[20]                
Cost 4,474,000 [4],[7],[16],[19] 4,461,000 [1],[8],[11],[17],[20]     4,474,000 [4],[7],[16],[19]   4,474,000 [4],[7],[16],[19]   4,461,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: HTI Technology & Industries, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,045,000 2,045,000     2,045,000   2,045,000   2,045,000                
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 11,475,000       11,475,000   11,475,000                    
Cost [2],[4],[7] 11,347,000       11,347,000   11,347,000                    
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [2],[4],[7],[24] (18,000) [1],[8],[11],[15]     0 [2],[4],[7],[24]   0 [2],[4],[7],[24]   (18,000) [1],[8],[11],[15]                
Cost (12,000) [2],[4],[7],[24] (18,000) [1],[8],[11],[15]     (12,000) [2],[4],[7],[24]   (12,000) [2],[4],[7],[24]   (18,000) [1],[8],[11],[15]                
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Second Lien Note                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   11,363,000             11,363,000                
Cost [1],[8],[11],[15]   11,361,000             11,361,000                
Investment, Identifier [Axis]: HTI Technology & Industries, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,364,000 1,364,000     1,364,000   1,364,000   1,364,000                
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 10,906,000 [2],[4],[7] 4,928,000 [1],[8],[11],[12]     10,906,000 [2],[4],[7]   10,906,000 [2],[4],[7]   4,928,000 [1],[8],[11],[12]                
Cost 11,116,000 [2],[4],[7] 4,946,000 [1],[8],[11],[12]     11,116,000 [2],[4],[7]   11,116,000 [2],[4],[7]   4,946,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[26]   5,834,000             5,834,000                
Cost [1],[8],[11],[26]   5,832,000             5,832,000                
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 913,000     0   0   913,000                
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 290,000 313,000     290,000   290,000   313,000                
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 585,000 [4],[7],[16],[36] 598,000 [1],[8],[11],[17],[49]     585,000 [4],[7],[16],[36]   585,000 [4],[7],[16],[36]   598,000 [1],[8],[11],[17],[49]                
Cost 580,000 [4],[7],[16],[36] 569,000 [1],[8],[11],[17],[49]     580,000 [4],[7],[16],[36]   580,000 [4],[7],[16],[36]   569,000 [1],[8],[11],[17],[49]                
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 267,000     0   0   267,000                
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 10,681,000 [7] 1,151,000 [1],[11]     10,681,000 [7]   10,681,000 [7]   1,151,000 [1],[11]                
Cost $ 11,999,000 [7] $ 1,161,000 [1],[11]     $ 11,999,000 [7]   $ 11,999,000 [7]   $ 1,161,000 [1],[11]                
Investment, interest rate, paid in kind 11.00% [7] 11.00% [1],[11]     11.00% [7]   11.00% [7]   11.00% [1],[11]                
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11]   $ 9,183,000             $ 9,183,000                
Cost [1],[11]   $ 9,238,000             $ 9,238,000                
Investment, interest rate, paid in kind [1],[11]   11.00%             11.00%                
Investment, Identifier [Axis]: Heartland, LLC, Business Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 13,680,000 [4],[7],[18] $ 13,795,000 [1],[8],[11],[12]     $ 13,680,000 [4],[7],[18]   $ 13,680,000 [4],[7],[18]   $ 13,795,000 [1],[8],[11],[12]                
Cost 13,743,000 [4],[7],[18] 13,884,000 [1],[8],[11],[12]     13,743,000 [4],[7],[18]   13,743,000 [4],[7],[18]   13,884,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,632,000 2,632,000     2,632,000   2,632,000   2,632,000                
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 7,313,000 [4],[7],[18] 7,276,000 [1],[8],[11],[26]     7,313,000 [4],[7],[18]   7,313,000 [4],[7],[18]   7,276,000 [1],[8],[11],[26]                
Cost 7,206,000 [4],[7],[18] 7,244,000 [1],[8],[11],[26]     7,206,000 [4],[7],[18]   7,206,000 [4],[7],[18]   7,244,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [4],[7],[18],[24] (33,000) [1],[8],[11],[26]     0 [4],[7],[18],[24]   0 [4],[7],[18],[24]   (33,000) [1],[8],[11],[26]                
Cost (36,000) [4],[7],[18],[24] (43,000) [1],[8],[11],[26]     (36,000) [4],[7],[18],[24]   (36,000) [4],[7],[18],[24]   (43,000) [1],[8],[11],[26]                
Investment, Identifier [Axis]: Heilbron (f/k/a Sucsez (Bolt Bidco B.V.)), Insurance, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,078,000 [4],[7],[16],[32] 3,148,000 [1],[8],[11],[17],[20]     3,078,000 [4],[7],[16],[32]   3,078,000 [4],[7],[16],[32]   3,148,000 [1],[8],[11],[17],[20]                
Cost 3,676,000 [4],[7],[16],[32] 3,676,000 [1],[8],[11],[17],[20]     3,676,000 [4],[7],[16],[32]   3,676,000 [4],[7],[16],[32]   3,676,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: HemaSource, Inc, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,804,000 0     1,804,000   1,804,000   0                
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 101,000       101,000   101,000                    
Cost [7],[13] 101,000       101,000   101,000                    
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 7,382,000       7,382,000   7,382,000                    
Cost [2],[4],[7] 7,384,000       7,384,000   7,384,000                    
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] (45,000)       (45,000)   (45,000)                    
Cost [2],[4],[7],[24] (44,000)       (44,000)   (44,000)                    
Investment, Identifier [Axis]: Holland Acquisition Corp., Energy: Oil & Gas, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [4],[5],[6],[7],[27] 0 [1],[8],[9],[10],[11],[28]     0 [4],[5],[6],[7],[27]   0 [4],[5],[6],[7],[27]   0 [1],[8],[9],[10],[11],[28]                
Cost 0 [4],[5],[6],[7],[27] 0 [1],[8],[9],[10],[11],[28]     0 [4],[5],[6],[7],[27]   0 [4],[5],[6],[7],[27]   0 [1],[8],[9],[10],[11],[28]                
Investment, Identifier [Axis]: Home Care Assistance, LLC, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,441,000 [2],[4],[7] 3,621,000 [1],[8],[11],[23]     3,441,000 [2],[4],[7]   3,441,000 [2],[4],[7]   3,621,000 [1],[8],[11],[23]                
Cost 3,710,000 [2],[4],[7] 3,736,000 [1],[8],[11],[23]     3,710,000 [2],[4],[7]   3,710,000 [2],[4],[7]   3,736,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: Honour Lane Logistics Holdings Limited, Transportation Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,407,000 [4],[7],[16],[27] 7,814,000 [1],[8],[11],[17],[25]     6,407,000 [4],[7],[16],[27]   6,407,000 [4],[7],[16],[27]   7,814,000 [1],[8],[11],[17],[25]                
Cost 6,505,000 [4],[7],[16],[27] 7,781,000 [1],[8],[11],[17],[25]     6,505,000 [4],[7],[16],[27]   6,505,000 [4],[7],[16],[27]   7,781,000 [1],[8],[11],[17],[25]                
Investment, Identifier [Axis]: Hygie 31 Holding, Pharma-ceuticals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,663,000 [4],[7],[16],[32] 1,665,000 [1],[8],[11],[17],[20]     1,663,000 [4],[7],[16],[32]   1,663,000 [4],[7],[16],[32]   1,665,000 [1],[8],[11],[17],[20]                
Cost 1,502,000 [4],[7],[16],[32] 1,498,000 [1],[8],[11],[17],[20]     1,502,000 [4],[7],[16],[32]   1,502,000 [4],[7],[16],[32]   1,498,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 3,586,000 4,496,000     3,586,000   3,586,000   4,496,000       0        
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 3,586,000 [3],[7],[13] 4,496,000 [1],[11],[14]     3,586,000 [3],[7],[13]   3,586,000 [3],[7],[13]   4,496,000 [1],[11],[14]                
Cost 5,219,000 [3],[7],[13] 5,219,000 [1],[11],[14]     5,219,000 [3],[7],[13]   5,219,000 [3],[7],[13]   5,219,000 [1],[11],[14]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,917,000 [2],[3],[4],[7] 3,917,000 [1],[8],[11],[15]     3,917,000 [2],[3],[4],[7]   3,917,000 [2],[3],[4],[7]   3,917,000 [1],[8],[11],[15]                
Cost 3,726,000 [2],[3],[4],[7] 3,670,000 [1],[8],[11],[15]     3,726,000 [2],[3],[4],[7]   3,726,000 [2],[3],[4],[7]   3,670,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,441,000 [2],[3],[4],[7] 4,098,000 [1],[8],[11],[15]     4,441,000 [2],[3],[4],[7]   4,441,000 [2],[3],[4],[7]   4,098,000 [1],[8],[11],[15]                
Cost 4,441,000 [2],[3],[4],[7] 4,098,000 [1],[8],[11],[15]     4,441,000 [2],[3],[4],[7]   4,441,000 [2],[3],[4],[7]   4,098,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 3,917,000 3,917,000     3,917,000   3,917,000   3,917,000       0        
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 4,441,000 4,098,000     4,441,000   4,441,000   4,098,000       0        
Investment, Identifier [Axis]: IM Analytics Holding, LLC (d/b/a NVT), Electronic Instruments & Components, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,328,000 [4],[7],[27] 3,247,000 [1],[8],[11],[26]     3,328,000 [4],[7],[27]   3,328,000 [4],[7],[27]   3,247,000 [1],[8],[11],[26]                
Cost 3,378,000 [4],[7],[27] 3,388,000 [1],[8],[11],[26]     3,378,000 [4],[7],[27]   3,378,000 [4],[7],[27]   3,388,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: IM Analytics Holding, LLC (d/b/a NVT), Electronic Instruments & Components, Warrants                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Cost 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Investment, Identifier [Axis]: IM Square, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,594,000 [4],[7],[16],[19] 2,583,000 [1],[8],[11],[17],[20]     2,594,000 [4],[7],[16],[19]   2,594,000 [4],[7],[16],[19]   2,583,000 [1],[8],[11],[17],[20]                
Cost 2,945,000 [4],[7],[16],[19] 2,938,000 [1],[8],[11],[17],[20]     2,945,000 [4],[7],[16],[19]   2,945,000 [4],[7],[16],[19]   2,938,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: INOS 19-090 GmbH, Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,794,000 2,380,000     1,794,000   1,794,000   2,380,000                
Investment, Identifier [Axis]: INOS 19-090 GmbH, Aerospace & Defense, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,474,000 [4],[7],[16],[19] 4,892,000 [1],[8],[11],[17],[20]     5,474,000 [4],[7],[16],[19]   5,474,000 [4],[7],[16],[19]   4,892,000 [1],[8],[11],[17],[20]                
Cost 6,122,000 [4],[7],[16],[19] 5,515,000 [1],[8],[11],[17],[20]     6,122,000 [4],[7],[16],[19]   6,122,000 [4],[7],[16],[19]   5,515,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 103,000     0   0   103,000                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,207,000 118,000     1,207,000   1,207,000   118,000                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 772,000 [7],[13] 127,000 [1],[11],[14]     772,000 [7],[13]   772,000 [7],[13]   127,000 [1],[11],[14]                
Cost 750,000 [7],[13] 144,000 [1],[11],[14]     750,000 [7],[13]   750,000 [7],[13]   144,000 [1],[11],[14]                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 12,842,000 [2],[4],[7] 703,000 [1],[8],[11],[26]     12,842,000 [2],[4],[7]   12,842,000 [2],[4],[7]   703,000 [1],[8],[11],[26]                
Cost 12,729,000 [2],[4],[7] 700,000 [1],[8],[11],[26]     12,729,000 [2],[4],[7]   12,729,000 [2],[4],[7]   700,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 29,000 [2],[4],[7] 5,000 [1],[8],[11],[26]     29,000 [2],[4],[7]   29,000 [2],[4],[7]   5,000 [1],[8],[11],[26]                
Cost 18,000 [2],[4],[7] 4,000 [1],[8],[11],[26]     18,000 [2],[4],[7]   18,000 [2],[4],[7]   4,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Infoniqa Holdings GmbH, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,753,000 [4],[7],[16],[32] 2,729,000 [1],[8],[11],[17],[29]     2,753,000 [4],[7],[16],[32]   2,753,000 [4],[7],[16],[32]   2,729,000 [1],[8],[11],[17],[29]                
Cost 2,909,000 [4],[7],[16],[32] 2,902,000 [1],[8],[11],[17],[29]     2,909,000 [4],[7],[16],[32]   2,909,000 [4],[7],[16],[32]   2,902,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[29]   5,495,000             5,495,000                
Cost [1],[8],[11],[17],[29]   6,791,000             6,791,000                
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[32] 5,912,000       5,912,000   5,912,000                    
Cost [4],[7],[16],[32] 6,829,000       6,829,000   6,829,000                    
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[53] 947,000       947,000   947,000                    
Cost [4],[7],[16],[53] 1,019,000       1,019,000   1,019,000                    
Investment, Identifier [Axis]: Innovad Group II BV, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 255,000 1,261,000     255,000   255,000   1,261,000                
Investment, Identifier [Axis]: Innovative XCessories & Services, LLC, Automotive, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,353,000 [4],[5],[27] 2,277,000 [1],[8],[9],[28]     2,353,000 [4],[5],[27]   2,353,000 [4],[5],[27]   2,277,000 [1],[8],[9],[28]                
Cost 2,847,000 [4],[5],[27] 2,854,000 [1],[8],[9],[28]     2,847,000 [4],[5],[27]   2,847,000 [4],[5],[27]   2,854,000 [1],[8],[9],[28]                
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 748,000 1,310,000     748,000   748,000   1,310,000                
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 55,000 55,000     55,000   55,000   55,000                
Investment, Identifier [Axis]: Interstellar Group B.V., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,450,000 [4],[7],[16],[19] 1,239,000 [1],[8],[11],[17],[20]     1,450,000 [4],[7],[16],[19]   1,450,000 [4],[7],[16],[19]   1,239,000 [1],[8],[11],[17],[20]                
Cost 1,429,000 [4],[7],[16],[19] 1,191,000 [1],[8],[11],[17],[20]     1,429,000 [4],[7],[16],[19]   1,429,000 [4],[7],[16],[19]   1,191,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Iqor US Inc., Services: Business, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,624,000 [4],[5],[18] 2,658,000 [1],[8],[9],[26]     2,624,000 [4],[5],[18]   2,624,000 [4],[5],[18]   2,658,000 [1],[8],[9],[26]                
Cost 2,697,000 [4],[5],[18] 2,711,000 [1],[8],[9],[26]     2,697,000 [4],[5],[18]   2,697,000 [4],[5],[18]   2,711,000 [1],[8],[9],[26]                
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13],[54] 0       0   0                    
Cost [7],[13],[54] 0       0   0                    
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 707,000 [2],[4],[5],[7] 553,000 [1],[8],[9],[10],[11],[12]     707,000 [2],[4],[5],[7]   707,000 [2],[4],[5],[7]   553,000 [1],[8],[9],[10],[11],[12]                
Cost 515,000 [2],[4],[5],[7] 1,160,000 [1],[8],[9],[10],[11],[12]     515,000 [2],[4],[5],[7]   515,000 [2],[4],[5],[7]   1,160,000 [1],[8],[9],[10],[11],[12]                
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 738,000 744,000     738,000   738,000   744,000                
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Trading Companies & Distributors, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,458,000 [4],[7],[16],[19] 4,436,000 [1],[8],[11],[17],[33]     4,458,000 [4],[7],[16],[19]   4,458,000 [4],[7],[16],[19]   4,436,000 [1],[8],[11],[17],[33]                
Cost 4,057,000 [4],[7],[16],[19] 4,044,000 [1],[8],[11],[17],[33]     4,057,000 [4],[7],[16],[19]   4,057,000 [4],[7],[16],[19]   4,044,000 [1],[8],[11],[17],[33]                
Investment, Identifier [Axis]: Ivanti Software, Inc., High Tech Industries, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,270,000 [2],[4],[5] 3,383,000 [1],[8],[9],[12]     4,270,000 [2],[4],[5]   4,270,000 [2],[4],[5]   3,383,000 [1],[8],[9],[12]                
Cost 5,989,000 [2],[4],[5] 5,989,000 [1],[8],[9],[12]     5,989,000 [2],[4],[5]   5,989,000 [2],[4],[5]   5,989,000 [1],[8],[9],[12]                
Investment, Identifier [Axis]: JF Acquisition, LLC, Automotive, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,729,000 [2],[4],[7] 3,575,000 [1],[8],[11],[26]     3,729,000 [2],[4],[7]   3,729,000 [2],[4],[7]   3,575,000 [1],[8],[11],[26]                
Cost 3,734,000 [2],[4],[7] 3,747,000 [1],[8],[11],[26]     3,734,000 [2],[4],[7]   3,734,000 [2],[4],[7]   3,747,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: JSC Tekers Holdings, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       0        
Investment, Identifier [Axis]: JSC Tekers Holdings, Common Stock, Controlled Investment                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       0        
Investment, Identifier [Axis]: JSC Tekers Holdings, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       6,197,000        
Investment, Identifier [Axis]: JSC Tekers Holdings, Preferred Stock, Controlled Investment                                  
Schedule of Investments [Line Items]                                  
Fair value   0             0       0        
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), Aerospace & Defense, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 1,125,000 [4],[7],[16],[32] 4,009,000 [1],[8],[11],[17],[29]     1,125,000 [4],[7],[16],[32]   1,125,000 [4],[7],[16],[32]   4,009,000 [1],[8],[11],[17],[29]                
Cost 1,150,000 [4],[7],[16],[32] 4,082,000 [1],[8],[11],[17],[29]     1,150,000 [4],[7],[16],[32]   1,150,000 [4],[7],[16],[32]   4,082,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), Aerospace & Defense, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 6,634,000 [4],[7],[16],[27] 6,592,000 [1],[8],[11],[17],[25]     6,634,000 [4],[7],[16],[27]   6,634,000 [4],[7],[16],[27]   6,592,000 [1],[8],[11],[17],[25]                
Cost 6,592,000 [4],[7],[16],[27] 6,576,000 [1],[8],[11],[17],[25]     6,592,000 [4],[7],[16],[27]   6,592,000 [4],[7],[16],[27]   6,576,000 [1],[8],[11],[17],[25]                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 422,000     0   0   422,000                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Other Financial, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   7,617,000             7,617,000                
Cost [1],[8],[11],[15]   7,571,000             7,571,000                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Other Financial, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   (2,000)             (2,000)                
Cost [1],[8],[11],[15]   (4,000)             (4,000)                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 490,000     0   0   490,000                
Investment, Identifier [Axis]: Jedson Engineering, Inc., Engineering & Construction Management, First Lien Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[47]   2,650,000             2,650,000                
Cost [1],[11],[47]   2,650,000             2,650,000                
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                                  
Schedule of Investments [Line Items]                                  
Fair value [1]   3,511,000             3,511,000                
Cost [1]   3,609,000             3,609,000                
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Structured Products, Structured Secured Note - Class B                                  
Schedule of Investments [Line Items]                                  
Fair value 3,367,000       3,367,000   3,367,000                    
Cost 3,330,000       3,330,000   3,330,000                    
Investment, Identifier [Axis]: Jocassee Partners LLC                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 65,000,000 65,000,000     65,000,000   65,000,000   65,000,000                
Contributed capital 35,000,000 35,000,000     35,000,000   35,000,000   35,000,000                
Investment, Identifier [Axis]: Jocassee Partners LLC, Investment Funds & Vehicles, 9.1% Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[17]   40,088,000             40,088,000                
Cost [1],[17]   35,158,000             35,158,000                
Investment, Identifier [Axis]: Jocassee Partners LLC, Investment Funds & Vehicles, Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value [3],[16] 41,233,000       41,233,000   41,233,000                    
Cost [3],[16] 35,158,000       35,158,000   35,158,000                    
Investment, Identifier [Axis]: Jocassee Partners LLC, Joint Venture                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 65,000,000 65,000,000     65,000,000   65,000,000   65,000,000                
Investment, Identifier [Axis]: Jocassee Partners LLC, Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 41,233,000 40,088,000     41,233,000   41,233,000   40,088,000       37,601,000        
Investment, Identifier [Axis]: Jon Bidco Limited, Capex & Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,068,000 1,441,000     1,068,000   1,068,000   1,441,000                
Investment, Identifier [Axis]: Jon Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,637,000 [4],[7],[16],[24],[51] 3,477,000 [1],[8],[11],[17],[52]     3,637,000 [4],[7],[16],[24],[51]   3,637,000 [4],[7],[16],[24],[51]   3,477,000 [1],[8],[11],[17],[52]                
Cost 4,127,000 [4],[7],[16],[24],[51] 3,813,000 [1],[8],[11],[17],[52]     4,127,000 [4],[7],[16],[24],[51]   4,127,000 [4],[7],[16],[24],[51]   3,813,000 [1],[8],[11],[17],[52]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,715,000 [2],[4],[7] 2,745,000 [1],[8],[11],[12]     2,715,000 [2],[4],[7]   2,715,000 [2],[4],[7]   2,745,000 [1],[8],[11],[12]                
Cost 2,742,000 [2],[4],[7] 2,736,000 [1],[8],[11],[12]     2,742,000 [2],[4],[7]   2,742,000 [2],[4],[7]   2,736,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 679,000       679,000   679,000                    
Cost [2],[4],[7] 677,000       677,000   677,000                    
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 221,000 [7] 115,000 [1],[11],[14]     221,000 [7]   221,000 [7]   115,000 [1],[11],[14]                
Cost 107,000 [7] 97,000 [1],[11],[14]     107,000 [7]   107,000 [7]   97,000 [1],[11],[14]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (10,000) [2],[4],[7],[24] (6,000) [1],[8],[11],[12]     (10,000) [2],[4],[7],[24]   (10,000) [2],[4],[7],[24]   (6,000) [1],[8],[11],[12]                
Cost (6,000) [2],[4],[7],[24] (7,000) [1],[8],[11],[12]     (6,000) [2],[4],[7],[24]   (6,000) [2],[4],[7],[24]   (7,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 418,000 418,000     418,000   418,000   418,000                
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,545,000 [2],[4],[7],[24] 5,545,000 [1],[8],[11],[28]     5,545,000 [2],[4],[7],[24]   5,545,000 [2],[4],[7],[24]   5,545,000 [1],[8],[11],[28]                
Cost 5,513,000 [2],[4],[7],[24] 5,535,000 [1],[8],[11],[28]     5,513,000 [2],[4],[7],[24]   5,513,000 [2],[4],[7],[24]   5,535,000 [1],[8],[11],[28]                
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, Partnership Equity                                  
Schedule of Investments [Line Items]                                  
Fair value 226,000 [7],[13] 191,000 [1],[11],[14]     226,000 [7],[13]   226,000 [7],[13]   191,000 [1],[11],[14]                
Cost 203,000 [7],[13] 203,000 [1],[11],[14]     203,000 [7],[13]   203,000 [7],[13]   203,000 [1],[11],[14]                
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 153,000 153,000     153,000   153,000   153,000                
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,830,000 2,830,000     2,830,000   2,830,000   2,830,000                
Investment, Identifier [Axis]: Kemmerer Operations LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 908,000     0   0   908,000                
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 2,336,000 1,181,000     2,336,000   2,336,000   1,181,000       0        
Investment, Identifier [Axis]: Kemmerer Operations, LLC, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 712,000 $ 1,565,000     $ 712,000   $ 712,000   $ 1,565,000       0        
Investment, interest rate, paid in kind 15.00% 15.00%     15.00%   15.00%   15.00%                
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Metals & Mining, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value $ 2,336,000 [3],[5],[7],[13] $ 1,181,000 [1],[9],[11],[14]     $ 2,336,000 [3],[5],[7],[13]   $ 2,336,000 [3],[5],[7],[13]   $ 1,181,000 [1],[9],[11],[14]                
Cost 1,589,000 [3],[5],[7],[13] 1,589,000 [1],[9],[11],[14]     1,589,000 [3],[5],[7],[13]   1,589,000 [3],[5],[7],[13]   1,589,000 [1],[9],[11],[14]                
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Metals & Mining, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 712,000 [3],[5],[7] 1,565,000 [1],[9],[11]     712,000 [3],[5],[7]   712,000 [3],[5],[7]   1,565,000 [1],[9],[11]                
Cost $ 712,000 [3],[5],[7] $ 1,565,000 [1],[9],[11]     $ 712,000 [3],[5],[7]   $ 712,000 [3],[5],[7]   $ 1,565,000 [1],[9],[11]                
Investment, interest rate, paid in kind 15.00% [3],[5],[7] 15.00% [1],[9],[11]     15.00% [3],[5],[7]   15.00% [3],[5],[7]   15.00% [1],[9],[11]                
Investment, Identifier [Axis]: Kene Acquisition, Inc. (En Engineering), Oil & Gas Equipment & Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 7,031,000 [2],[4],[7] $ 7,027,000 [1],[8],[11],[12]     $ 7,031,000 [2],[4],[7]   $ 7,031,000 [2],[4],[7]   $ 7,027,000 [1],[8],[11],[12]                
Cost 7,031,000 [2],[4],[7] 7,071,000 [1],[8],[11],[12]     7,031,000 [2],[4],[7]   7,031,000 [2],[4],[7]   7,071,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,101,000 [2],[4],[7] 9,125,000 [1],[8],[11],[12]     9,101,000 [2],[4],[7]   9,101,000 [2],[4],[7]   9,125,000 [1],[8],[11],[12]                
Cost 9,031,000 [2],[4],[7] 9,080,000 [1],[8],[11],[12]     9,031,000 [2],[4],[7]   9,031,000 [2],[4],[7]   9,080,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 658,000 [7],[13] 577,000 [1],[11],[14]     658,000 [7],[13]   658,000 [7],[13]   577,000 [1],[11],[14]                
Cost 638,000 [7],[13] 638,000 [1],[11],[14]     638,000 [7],[13]   638,000 [7],[13]   638,000 [1],[11],[14]                
Investment, Identifier [Axis]: Kona Buyer, LLC, High Tech Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 8,626,000 [2],[4],[7] 8,623,000 [1],[8],[11],[15]     8,626,000 [2],[4],[7]   8,626,000 [2],[4],[7]   8,623,000 [1],[8],[11],[15]                
Cost 8,520,000 [2],[4],[7] 8,615,000 [1],[8],[11],[15]     8,520,000 [2],[4],[7]   8,520,000 [2],[4],[7]   8,615,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Lambir Bidco Limited, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 600,000 1,766,000     600,000   600,000   1,766,000                
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,737,000 [4],[7],[16],[19],[24] 4,397,000 [1],[8],[11],[17],[20]     1,737,000 [4],[7],[16],[19],[24]   1,737,000 [4],[7],[16],[19],[24]   4,397,000 [1],[8],[11],[17],[20]                
Cost 1,959,000 [4],[7],[16],[19],[24] 4,794,000 [1],[8],[11],[17],[20]     1,959,000 [4],[7],[16],[19],[24]   1,959,000 [4],[7],[16],[19],[24]   4,794,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,386,000 [7],[16] 1,409,000 [1],[11],[17]     1,386,000 [7],[16]   1,386,000 [7],[16]   1,409,000 [1],[11],[17]                
Cost $ 1,629,000 [7],[16] $ 1,533,000 [1],[11],[17]     $ 1,629,000 [7],[16]   $ 1,629,000 [7],[16]   $ 1,533,000 [1],[11],[17]                
Investment, interest rate, paid in kind 12.00% [7],[16] 12.00% [1],[11],[17]     12.00% [7],[16]   12.00% [7],[16]   12.00% [1],[11],[17]                
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 255,000 $ 298,000     $ 255,000   $ 255,000   $ 298,000                
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 18,000 0     18,000   18,000   0                
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 655,000 [4],[7],[16],[24],[27] 633,000 [1],[8],[11],[17],[25]     655,000 [4],[7],[16],[24],[27]   655,000 [4],[7],[16],[24],[27]   633,000 [1],[8],[11],[17],[25]                
Cost 690,000 [4],[7],[16],[24],[27] 645,000 [1],[8],[11],[17],[25]     690,000 [4],[7],[16],[24],[27]   690,000 [4],[7],[16],[24],[27]   645,000 [1],[8],[11],[17],[25]                
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 16,000 [4],[7],[16],[24],[27] 34,000 [1],[8],[11],[15],[17]     16,000 [4],[7],[16],[24],[27]   16,000 [4],[7],[16],[24],[27]   34,000 [1],[8],[11],[15],[17]                
Cost 17,000 [4],[7],[16],[24],[27] 35,000 [1],[8],[11],[15],[17]     17,000 [4],[7],[16],[24],[27]   17,000 [4],[7],[16],[24],[27]   35,000 [1],[8],[11],[15],[17]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,945,000 [2],[4],[7] 10,150,000 [1],[8],[11],[12]     9,945,000 [2],[4],[7]   9,945,000 [2],[4],[7]   10,150,000 [1],[8],[11],[12]                
Cost 10,064,000 [2],[4],[7] 10,119,000 [1],[8],[11],[12]     10,064,000 [2],[4],[7]   10,064,000 [2],[4],[7]   10,119,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 184,000 [7] 65,000 [1],[11],[14]     184,000 [7]   184,000 [7]   65,000 [1],[11],[14]                
Cost 85,000 [7] 52,000 [1],[11],[14]     85,000 [7]   85,000 [7]   52,000 [1],[11],[14]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (65,000) [2],[4],[7],[24] (32,000) [1],[8],[11],[12]     (65,000) [2],[4],[7],[24]   (65,000) [2],[4],[7],[24]   (32,000) [1],[8],[11],[12]                
Cost (33,000) [2],[4],[7],[24] (39,000) [1],[8],[11],[12]     (33,000) [2],[4],[7],[24]   (33,000) [2],[4],[7],[24]   (39,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,603,000 2,603,000     2,603,000   2,603,000   2,603,000                
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 5,352,000 [4],[18] 100,000 [1],[8],[26]     5,352,000 [4],[18]   5,352,000 [4],[18]   100,000 [1],[8],[26]                
Cost 5,532,000 [4],[18] 94,000 [1],[8],[26]     5,532,000 [4],[18]   5,532,000 [4],[18]   94,000 [1],[8],[26]                
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 3,589,000 [7],[13] 8,455,000 [1],[12]     3,589,000 [7],[13]   3,589,000 [7],[13]   8,455,000 [1],[12]                
Cost 3,105,000 [7],[13] 8,784,000 [1],[12]     3,105,000 [7],[13]   3,105,000 [7],[13]   8,784,000 [1],[12]                
Investment, Identifier [Axis]: Legal Solutions Holdings, Business Services, Senior Subordinated Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [6],[7],[55] 0 [1],[10],[11],[47]     0 [6],[7],[55]   0 [6],[7],[55]   0 [1],[10],[11],[47]                
Cost $ 10,129,000 [6],[7],[55] $ 10,129,000 [1],[10],[11],[47]     $ 10,129,000 [6],[7],[55]   $ 10,129,000 [6],[7],[55]   $ 10,129,000 [1],[10],[11],[47]                
Investment, interest rate, paid in kind 16.00% [6],[7],[55] 16.00% [1],[10],[11],[47]     16.00% [6],[7],[55]   16.00% [6],[7],[55]   16.00% [1],[10],[11],[47]                
Investment, Identifier [Axis]: Liberty Steel Holdings USA Inc., Industrial Other, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value $ 19,960,000 [2],[4],[7] $ 19,846,000 [1],[8],[11],[23]     $ 19,960,000 [2],[4],[7]   $ 19,960,000 [2],[4],[7]   $ 19,846,000 [1],[8],[11],[23]                
Cost 19,897,000 [2],[4],[7] 19,847,000 [1],[8],[11],[23]     19,897,000 [2],[4],[7]   19,897,000 [2],[4],[7]   19,847,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,795,000 [2],[4],[5],[7] 2,980,000 [1],[8],[9],[11],[12]     2,795,000 [2],[4],[5],[7]   2,795,000 [2],[4],[5],[7]   2,980,000 [1],[8],[9],[11],[12]                
Cost 3,006,000 [2],[4],[5],[7] 3,194,000 [1],[8],[9],[11],[12]     3,006,000 [2],[4],[5],[7]   3,006,000 [2],[4],[5],[7]   3,194,000 [1],[8],[9],[11],[12]                
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (175,000) [2],[4],[5],[7],[24] (168,000) [1],[8],[9],[11],[12]     (175,000) [2],[4],[5],[7],[24]   (175,000) [2],[4],[5],[7],[24]   (168,000) [1],[8],[9],[11],[12]                
Cost 0 [2],[4],[5],[7],[24] 0 [1],[8],[9],[11],[12]     0 [2],[4],[5],[7],[24]   0 [2],[4],[5],[7],[24]   0 [1],[8],[9],[11],[12]                
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,500,000 2,500,000     2,500,000   2,500,000   2,500,000                
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Business Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 859,000 [2],[4],[7] 837,000 [1],[8],[11],[12]     859,000 [2],[4],[7]   859,000 [2],[4],[7]   837,000 [1],[8],[11],[12]                
Cost 858,000 [2],[4],[7] 855,000 [1],[8],[11],[12]     858,000 [2],[4],[7]   858,000 [2],[4],[7]   855,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 138,000     0   0   138,000                
Investment, Identifier [Axis]: LogMeIn, Inc., High Tech Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,282,000 [4],[5],[18] 1,253,000 [1],[8],[9],[26]     1,282,000 [4],[5],[18]   1,282,000 [4],[5],[18]   1,253,000 [1],[8],[9],[26]                
Cost 1,927,000 [4],[5],[18] 1,942,000 [1],[8],[9],[26]     1,927,000 [4],[5],[18]   1,927,000 [4],[5],[18]   1,942,000 [1],[8],[9],[26]                
Investment, Identifier [Axis]: Long Term Care Group, Inc., Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,328,000 [4],[7],[18] 7,816,000 [1],[8],[11],[26]     6,328,000 [4],[7],[18]   6,328,000 [4],[7],[18]   7,816,000 [1],[8],[11],[26]                
Cost $ 7,977,000 [4],[7],[18] 7,897,000 [1],[8],[11],[26]     $ 7,977,000 [4],[7],[18]   $ 7,977,000 [4],[7],[18]   7,897,000 [1],[8],[11],[26]                
Investment, interest rate, paid in kind [18] 6.00%       6.00%   6.00%                    
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 4,135,000 [2],[4],[7] 4,123,000 [1],[8],[11],[26]     $ 4,135,000 [2],[4],[7]   $ 4,135,000 [2],[4],[7]   4,123,000 [1],[8],[11],[26]                
Cost 4,096,000 [2],[4],[7] 4,096,000 [1],[8],[11],[26]     4,096,000 [2],[4],[7]   4,096,000 [2],[4],[7]   4,096,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 829,000 [7],[13] 781,000 [1],[11],[14]     829,000 [7],[13]   829,000 [7],[13]   781,000 [1],[11],[14]                
Cost 747,000 [7],[13] 747,000 [1],[11],[14]     747,000 [7],[13]   747,000 [7],[13]   747,000 [1],[11],[14]                
Investment, Identifier [Axis]: MC Group Ventures Corporation, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 276,000 296,000     276,000   276,000   296,000                
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction and Building, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 904,000 [4],[7],[18] 835,000 [1],[8],[11],[26]     904,000 [4],[7],[18]   904,000 [4],[7],[18]   835,000 [1],[8],[11],[26]                
Cost 894,000 [4],[7],[18] 897,000 [1],[8],[11],[26]     894,000 [4],[7],[18]   894,000 [4],[7],[18]   897,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction and Building, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 72,000 [7],[13] 54,000 [1],[11],[14]     72,000 [7],[13]   72,000 [7],[13]   54,000 [1],[11],[14]                
Cost 77,000 [7],[13] 77,000 [1],[11],[14]     77,000 [7],[13]   77,000 [7],[13]   77,000 [1],[11],[14]                
Investment, Identifier [Axis]: MVC Automotive Group GmbH, Bridge Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 9,616,000 $ 7,149,000     $ 9,616,000   $ 9,616,000   $ 7,149,000       7,149,000        
Investment, interest rate, paid in kind 1.50% 6.00%     1.50%   1.50%   6.00%                
Investment, Identifier [Axis]: MVC Automotive Group GmbH, Common Equity Interest                                  
Schedule of Investments [Line Items]                                  
Fair value $ 14,538,000 $ 9,675,000     $ 14,538,000   $ 14,538,000   $ 9,675,000       7,699,000        
Investment, Identifier [Axis]: MVC Automotive Group Gmbh, Automotive, Bridge Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,616,000 [7],[16],[40],[55] 7,149,000 [1],[11],[17],[47]     9,616,000 [7],[16],[40],[55]   9,616,000 [7],[16],[40],[55]   7,149,000 [1],[11],[17],[47]                
Cost $ 9,616,000 [7],[16],[40],[55] 7,149,000 [1],[11],[17],[47]     $ 9,616,000 [7],[16],[40],[55]   $ 9,616,000 [7],[16],[40],[55]   7,149,000 [1],[11],[17],[47]                
Investment, interest rate, paid in kind [7],[16],[40],[55] 1.50%       1.50%   1.50%                    
Investment, Identifier [Axis]: MVC Automotive Group Gmbh, Automotive, Common Equity interest                                  
Schedule of Investments [Line Items]                                  
Fair value $ 14,538,000 [7],[13],[16],[40],[55] 9,675,000 [1],[11],[14],[17],[47]     $ 14,538,000 [7],[13],[16],[40],[55]   $ 14,538,000 [7],[13],[16],[40],[55]   9,675,000 [1],[11],[14],[17],[47]                
Cost 9,553,000 [7],[13],[16],[40],[55] 9,553,000 [1],[11],[14],[17],[47]     9,553,000 [7],[13],[16],[40],[55]   9,553,000 [7],[13],[16],[40],[55]   9,553,000 [1],[11],[14],[17],[47]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, General Partnership Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 24,000 45,000     24,000   24,000   45,000       188,000        
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Investment Funds & Vehicles, General Partnership Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 24,000 [16],[40],[55] 45,000 [1],[17],[47]     24,000 [16],[40],[55]   24,000 [16],[40],[55]   45,000 [1],[17],[47]                
Cost 210,000 [16],[40],[55] 225,000 [1],[17],[47]     210,000 [16],[40],[55]   210,000 [16],[40],[55]   225,000 [1],[17],[47]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Investment Funds & Vehicles, Limited Partnership Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 981,000 [13],[16],[40],[55] 1,793,000 [1],[17],[47]     981,000 [13],[16],[40],[55]   981,000 [13],[16],[40],[55]   1,793,000 [1],[17],[47]                
Cost 8,319,000 [13],[16],[40],[55] 8,899,000 [1],[17],[47]     8,319,000 [13],[16],[40],[55]   8,319,000 [13],[16],[40],[55]   8,899,000 [1],[17],[47]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Limited Partnership Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 981,000 1,793,000     981,000   981,000   1,793,000       7,376,000        
Investment, Identifier [Axis]: Magnetite XIX, Limited, Multi-Sector Holdings, Subordinated Notes                                  
Schedule of Investments [Line Items]                                  
Fair value 4,987,000 [2],[5],[16] 4,450,000 [1],[9],[17]     4,987,000 [2],[5],[16]   4,987,000 [2],[5],[16]   4,450,000 [1],[9],[17]                
Cost 5,107,000 [2],[5],[16] 5,107,000 [1],[9],[17]     5,107,000 [2],[5],[16]   5,107,000 [2],[5],[16]   5,107,000 [1],[9],[17]                
Investment, Identifier [Axis]: Magnetite XIX, Limited, Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value 9,283,000 [5],[16] 7,992,000 [1],[9],[17]     9,283,000 [5],[16]   9,283,000 [5],[16]   7,992,000 [1],[9],[17]                
Cost 9,184,000 [5],[16] 9,377,000 [1],[9],[17]     9,184,000 [5],[16]   9,184,000 [5],[16]   9,377,000 [1],[9],[17]                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,913,000 [4],[7],[16],[19] 2,093,000 [1],[8],[11],[17],[29]     1,913,000 [4],[7],[16],[19]   1,913,000 [4],[7],[16],[19]   2,093,000 [1],[8],[11],[17],[29]                
Cost $ 2,298,000 [4],[7],[16],[19] 2,219,000 [1],[8],[11],[17],[29]     $ 2,298,000 [4],[7],[16],[19]   $ 2,298,000 [4],[7],[16],[19]   2,219,000 [1],[8],[11],[17],[29]                
Investment, interest rate, paid in kind [4],[7],[16],[19] 6.80%       6.80%   6.80%                    
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value $ 25,000 [4],[7],[16],[19] 40,000 [1],[8],[11],[17],[20]     $ 25,000 [4],[7],[16],[19]   $ 25,000 [4],[7],[16],[19]   40,000 [1],[8],[11],[17],[20]                
Cost 44,000 [4],[7],[16],[19] 42,000 [1],[8],[11],[17],[20]     44,000 [4],[7],[16],[19]   44,000 [4],[7],[16],[19]   42,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 24,000 24,000     24,000   24,000   24,000                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 104,000 106,000     104,000   104,000   106,000                
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 10,591,000 [2],[4],[7] 10,794,000 [1],[8],[11],[15]     10,591,000 [2],[4],[7]   10,591,000 [2],[4],[7]   10,794,000 [1],[8],[11],[15]                
Cost 10,726,000 [2],[4],[7] 10,786,000 [1],[8],[11],[15]     10,726,000 [2],[4],[7]   10,726,000 [2],[4],[7]   10,786,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 1,599,000 [2],[4],[7] 1,217,000 [1],[8],[11],[56]     1,599,000 [2],[4],[7]   1,599,000 [2],[4],[7]   1,217,000 [1],[8],[11],[56]                
Cost 1,619,000 [2],[4],[7] 1,215,000 [1],[8],[11],[56]     1,619,000 [2],[4],[7]   1,619,000 [2],[4],[7]   1,215,000 [1],[8],[11],[56]                
Investment, Identifier [Axis]: Marshall Excelsior Co., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 551,000 413,000     551,000   551,000   413,000                
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 2,826,000 [2],[4],[7] 2,903,000 [1],[8],[11],[15]     2,826,000 [2],[4],[7]   2,826,000 [2],[4],[7]   2,903,000 [1],[8],[11],[15]                
Cost 2,858,000 [2],[4],[7] 2,872,000 [1],[8],[11],[15]     2,858,000 [2],[4],[7]   2,858,000 [2],[4],[7]   2,872,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 3,853,000 [4],[7],[30] 3,894,000 [1],[8],[11],[42]     3,853,000 [4],[7],[30]   3,853,000 [4],[7],[30]   3,894,000 [1],[8],[11],[42]                
Cost 4,240,000 [4],[7],[30] 4,257,000 [1],[8],[11],[42]     4,240,000 [4],[7],[30]   4,240,000 [4],[7],[30]   4,257,000 [1],[8],[11],[42]                
Investment, Identifier [Axis]: Median B.V., Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 8,075,000 [4],[16],[35] 7,449,000 [1],[8],[17],[31]     8,075,000 [4],[16],[35]   8,075,000 [4],[16],[35]   7,449,000 [1],[8],[17],[31]                
Cost 9,836,000 [4],[16],[35] 9,797,000 [1],[8],[17],[31]     9,836,000 [4],[16],[35]   9,836,000 [4],[16],[35]   9,797,000 [1],[8],[17],[31]                
Investment, Identifier [Axis]: Medical Solutions Parent Holdings, Inc., Healthcare, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,946,000 [2],[4] 4,067,000 [1],[8],[26]     3,946,000 [2],[4]   3,946,000 [2],[4]   4,067,000 [1],[8],[26]                
Cost 4,385,000 [2],[4] 4,382,000 [1],[8],[26]     4,385,000 [2],[4]   4,385,000 [2],[4]   4,382,000 [1],[8],[26]                
Investment, Identifier [Axis]: Mercell Holding AS, Capex Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 738,000 797,000     738,000   738,000   797,000                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class A Units                                  
Schedule of Investments [Line Items]                                  
Fair value 119,000 [7],[13],[16] 116,000 [1],[11],[14],[17]     119,000 [7],[13],[16]   119,000 [7],[13],[16]   116,000 [1],[11],[14],[17]                
Cost 111,000 [7],[13],[16] 111,000 [1],[11],[14],[17]     111,000 [7],[13],[16]   111,000 [7],[13],[16]   111,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class B Units                                  
Schedule of Investments [Line Items]                                  
Fair value 48,000 [7],[13],[16] 0 [1],[11],[14],[17]     48,000 [7],[13],[16]   48,000 [7],[13],[16]   0 [1],[11],[14],[17]                
Cost 0 [7],[13],[16] 0 [1],[11],[14],[17]     0 [7],[13],[16]   0 [7],[13],[16]   0 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,895,000 [4],[7],[16],[57] 3,102,000 [1],[8],[11],[17],[58]     2,895,000 [4],[7],[16],[57]   2,895,000 [4],[7],[16],[57]   3,102,000 [1],[8],[11],[17],[58]                
Cost 3,135,000 [4],[7],[16],[57] 3,124,000 [1],[8],[11],[17],[58]     3,135,000 [4],[7],[16],[57]   3,135,000 [4],[7],[16],[57]   3,124,000 [1],[8],[11],[17],[58]                
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited, Capex Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 922,000 968,000     922,000   922,000   968,000                
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited., Non-durable Consumer Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 7,211,000 [4],[7],[16],[21],[24] 7,634,000 [1],[8],[11],[17],[22]     7,211,000 [4],[7],[16],[21],[24]   7,211,000 [4],[7],[16],[21],[24]   7,634,000 [1],[8],[11],[17],[22]                
Cost 8,356,000 [4],[7],[16],[21],[24] 8,324,000 [1],[8],[11],[17],[22]     8,356,000 [4],[7],[16],[21],[24]   8,356,000 [4],[7],[16],[21],[24]   8,324,000 [1],[8],[11],[17],[22]                
Investment, Identifier [Axis]: Moonlight Bidco Limited, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 538,000 0     538,000   538,000   0                
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13],[16] 131,000       131,000   131,000                    
Cost [7],[13],[16] 137,000       137,000   137,000                    
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[24],[30] 1,743,000       1,743,000   1,743,000                    
Cost [4],[7],[16],[24],[30] 1,874,000       1,874,000   1,874,000                    
Investment, Identifier [Axis]: Murphy Midco Limited, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 357,000 407,000     357,000   357,000   407,000                
Investment, Identifier [Axis]: Murphy Midco Limited, Media, Diversified & Production, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,233,000 [4],[7],[16],[24],[35] 1,150,000 [1],[8],[11],[17],[34]     1,233,000 [4],[7],[16],[24],[35]   1,233,000 [4],[7],[16],[24],[35]   1,150,000 [1],[8],[11],[17],[34]                
Cost 1,320,000 [4],[7],[16],[24],[35] 1,258,000 [1],[8],[11],[17],[34]     1,320,000 [4],[7],[16],[24],[35]   1,320,000 [4],[7],[16],[24],[35]   1,258,000 [1],[8],[11],[17],[34]                
Investment, Identifier [Axis]: Music Reports, Inc., Media & Entertainment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,872,000 [2],[4],[7] 6,816,000 [1],[8],[11],[26]     6,872,000 [2],[4],[7]   6,872,000 [2],[4],[7]   6,816,000 [1],[8],[11],[26]                
Cost 6,831,000 [2],[4],[7] 6,810,000 [1],[8],[11],[26]     6,831,000 [2],[4],[7]   6,831,000 [2],[4],[7]   6,810,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: NAW Buyer LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 7,576,000 0     7,576,000   7,576,000   0                
Investment, Identifier [Axis]: NAW Buyer LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,894,000 0     1,894,000   1,894,000   0                
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Equity Co Invest                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 473,000       473,000   473,000                    
Cost [7],[13] 473,000       473,000   473,000                    
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] 14,583,000       14,583,000   14,583,000                    
Cost [2],[4],[7],[24] 14,587,000       14,587,000   14,587,000                    
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] (47,000)       (47,000)   (47,000)                    
Cost [2],[4],[7],[24] (47,000)       (47,000)   (47,000)                    
Investment, Identifier [Axis]: NF Holdco, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 663,000 0     663,000   663,000   0                
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 6,220,000       6,220,000   6,220,000                    
Cost [2],[4],[7] 6,199,000       6,199,000   6,199,000                    
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 659,000       659,000   659,000                    
Cost [7],[13] 659,000       659,000   659,000                    
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 414,000       414,000   414,000                    
Cost [2],[4],[7] 412,000       412,000   412,000                    
Investment, Identifier [Axis]: NGS US Finco, LLC (f/k/a Dresser Natural Gas Solutions), Energy Equipment & Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,666,000 [4],[7],[18] 4,697,000 [1],[8],[11],[26]     4,666,000 [4],[7],[18]   4,666,000 [4],[7],[18]   4,697,000 [1],[8],[11],[26]                
Cost 4,659,000 [4],[7],[18] 4,693,000 [1],[8],[11],[26]     4,659,000 [4],[7],[18]   4,659,000 [4],[7],[18]   4,693,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: NPM Investments 28 B.V., Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,079,000 [4],[7],[16],[19] 2,084,000 [1],[8],[11],[17],[20]     2,079,000 [4],[7],[16],[19]   2,079,000 [4],[7],[16],[19]   2,084,000 [1],[8],[11],[17],[20]                
Cost 1,910,000 [4],[7],[16],[19] 1,904,000 [1],[8],[11],[17],[20]     1,910,000 [4],[7],[16],[19]   1,910,000 [4],[7],[16],[19]   1,904,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: NPM Investments 28 BV, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 459,000 463,000     459,000   459,000   463,000                
Investment, Identifier [Axis]: Napa Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 16,772,000 [4],[7],[16],[48] 16,963,000 [1],[8],[11],[17],[37]     16,772,000 [4],[7],[16],[48]   16,772,000 [4],[7],[16],[48]   16,963,000 [1],[8],[11],[17],[37]                
Cost 19,593,000 [4],[7],[16],[48] 19,527,000 [1],[8],[11],[17],[37]     19,593,000 [4],[7],[16],[48]   19,593,000 [4],[7],[16],[48]   19,527,000 [1],[8],[11],[17],[37]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class A Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 525,000 [7],[13] 300,000 [1],[11],[14]     525,000 [7],[13]   525,000 [7],[13]   300,000 [1],[11],[14]                
Cost 459,000 [7],[13] 459,000 [1],[11],[14]     459,000 [7],[13]   459,000 [7],[13]   459,000 [1],[11],[14]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class B Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 123,000 [7],[13] 0 [1],[11],[14]     123,000 [7],[13]   123,000 [7],[13]   0 [1],[11],[14]                
Cost 51,000 [7],[13] 51,000 [1],[11],[14]     51,000 [7],[13]   51,000 [7],[13]   51,000 [1],[11],[14]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,568,000 [2],[4],[7] 5,096,000 [1],[8],[11],[12]     5,568,000 [2],[4],[7]   5,568,000 [2],[4],[7]   5,096,000 [1],[8],[11],[12]                
Cost 5,536,000 [2],[4],[7] 5,553,000 [1],[8],[11],[12]     5,536,000 [2],[4],[7]   5,536,000 [2],[4],[7]   5,553,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (10,000) [2],[4],[7],[24] 5,000 [1],[8],[11],[12]     (10,000) [2],[4],[7],[24]   (10,000) [2],[4],[7],[24]   5,000 [1],[8],[11],[12]                
Cost (16,000) [2],[4],[7],[24] 112,000 [1],[8],[11],[12]     (16,000) [2],[4],[7],[24]   (16,000) [2],[4],[7],[24]   112,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,311,000 1,180,000     1,311,000   1,311,000   1,180,000                
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[26]   2,649,000             2,649,000                
Cost [1],[8],[11],[26]   2,663,000             2,663,000                
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 2,640,000 [4],[7],[18] 2,918,000 [1],[8],[11],[23]     2,640,000 [4],[7],[18]   2,640,000 [4],[7],[18]   2,918,000 [1],[8],[11],[23]                
Cost 2,649,000 [4],[7],[18] 2,920,000 [1],[8],[11],[23]     2,649,000 [4],[7],[18]   2,649,000 [4],[7],[18]   2,920,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] 2,947,000       2,947,000   2,947,000                    
Cost [4],[7],[18] $ 2,939,000       $ 2,939,000   $ 2,939,000                    
Investment, interest rate, paid in kind [4],[7],[18] 3.00%       3.00%   3.00%                    
Investment, Identifier [Axis]: NeoxCo, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 476,000 0     $ 476,000   $ 476,000   0                
Investment, Identifier [Axis]: NeoxCo, Internet Software & Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[32] 1,997,000       1,997,000   1,997,000                    
Cost [4],[7],[16],[32] 2,039,000       2,039,000   2,039,000                    
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 250,000 443,000     250,000   250,000   443,000                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[34]   1,508,000             1,508,000                
Cost [1],[8],[11],[17],[34]   1,684,000             1,684,000                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[27] 126,000       126,000   126,000                    
Cost [4],[7],[16],[27] 126,000       126,000   126,000                    
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [35] 1,642,000       1,642,000   1,642,000                    
Cost [35] 1,772,000       1,772,000   1,772,000                    
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 93,000 [4],[7],[16],[35] 184,000 [1],[8],[11],[17],[34]     93,000 [4],[7],[16],[35]   93,000 [4],[7],[16],[35]   184,000 [1],[8],[11],[17],[34]                
Cost 99,000 [4],[7],[16],[35] 202,000 [1],[8],[11],[17],[34]     99,000 [4],[7],[16],[35]   99,000 [4],[7],[16],[35]   202,000 [1],[8],[11],[17],[34]                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 93,000 0     93,000   93,000   0                
Investment, Identifier [Axis]: Northstar Recycling, LLC, Environmental Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,437,000 [2],[4],[7] 2,446,000 [1],[8],[11],[12]     2,437,000 [2],[4],[7]   2,437,000 [2],[4],[7]   2,446,000 [1],[8],[11],[12]                
Cost 2,422,000 [2],[4],[7] 2,434,000 [1],[8],[11],[12]     2,422,000 [2],[4],[7]   2,422,000 [2],[4],[7]   2,434,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Capex & Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 809,000 809,000     809,000   809,000   809,000                
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 3,975,000 [4],[7],[16],[27] 3,406,000 [1],[8],[11],[17],[37]     3,975,000 [4],[7],[16],[27]   3,975,000 [4],[7],[16],[27]   3,406,000 [1],[8],[11],[17],[37]                
Cost 3,939,000 [4],[7],[16],[27] 3,667,000 [1],[8],[11],[17],[37]     3,939,000 [4],[7],[16],[27]   3,939,000 [4],[7],[16],[27]   3,667,000 [1],[8],[11],[17],[37]                
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[25]   443,000             443,000                
Cost [1],[8],[11],[17],[25]   449,000             449,000                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,498,000 [4],[7],[18] 5,501,000 [1],[8],[11],[26]     5,498,000 [4],[7],[18]   5,498,000 [4],[7],[18]   5,501,000 [1],[8],[11],[26]                
Cost 5,468,000 [4],[7],[18] 5,488,000 [1],[8],[11],[26]     5,468,000 [4],[7],[18]   5,468,000 [4],[7],[18]   5,488,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 297,000 [7],[13] 226,000 [1],[11],[14]     297,000 [7],[13]   297,000 [7],[13]   226,000 [1],[11],[14]                
Cost 211,000 [7],[13] 211,000 [1],[11],[14]     211,000 [7],[13]   211,000 [7],[13]   211,000 [1],[11],[14]                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (14,000) [4],[7],[18],[24] (21,000) [1],[8],[11],[26]     (14,000) [4],[7],[18],[24]   (14,000) [4],[7],[18],[24]   (21,000) [1],[8],[11],[26]                
Cost (20,000) [4],[7],[18],[24] (23,000) [1],[8],[11],[26]     (20,000) [4],[7],[18],[24]   (20,000) [4],[7],[18],[24]   (23,000) [1],[8],[11],[26]                
Investment, Identifier [Axis]: OA Buyer, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,331,000 1,331,000     1,331,000   1,331,000   1,331,000                
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,360,000 [2],[4],[7] 3,567,000 [1],[8],[11],[25]     3,360,000 [2],[4],[7]   3,360,000 [2],[4],[7]   3,567,000 [1],[8],[11],[25]                
Cost 3,537,000 [2],[4],[7] 3,556,000 [1],[8],[11],[25]     3,537,000 [2],[4],[7]   3,537,000 [2],[4],[7]   3,556,000 [1],[8],[11],[25]                
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (89,000) [2],[4],[7],[24] 743,000 [1],[8],[11],[25]     (89,000) [2],[4],[7],[24]   (89,000) [2],[4],[7],[24]   743,000 [1],[8],[11],[25]                
Cost (21,000) [2],[4],[7],[24] 739,000 [1],[8],[11],[25]     (21,000) [2],[4],[7],[24]   (21,000) [2],[4],[7],[24]   739,000 [1],[8],[11],[25]                
Investment, Identifier [Axis]: OAC Holdings I Corp, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,370,000 607,000     1,370,000   1,370,000   607,000                
Investment, Identifier [Axis]: OG III B.V., Containers & Glass Products, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,313,000 [4],[7],[16],[19] 3,310,000 [1],[8],[11],[17],[20]     3,313,000 [4],[7],[16],[19]   3,313,000 [4],[7],[16],[19]   3,310,000 [1],[8],[11],[17],[20]                
Cost 3,681,000 [4],[7],[16],[19] 3,674,000 [1],[8],[11],[17],[20]     3,681,000 [4],[7],[16],[19]   3,681,000 [4],[7],[16],[19]   3,674,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 440,000 187,000     440,000   440,000   187,000                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   2,190,000             2,190,000                
Cost [1],[8],[11],[12]   2,219,000             2,219,000                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 2,204,000 [2],[4],[7] 2,206,000 [1],[8],[11],[15]     2,204,000 [2],[4],[7]   2,204,000 [2],[4],[7]   2,206,000 [1],[8],[11],[15]                
Cost 2,207,000 [2],[4],[7] 2,206,000 [1],[8],[11],[15]     2,207,000 [2],[4],[7]   2,207,000 [2],[4],[7]   2,206,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 2,220,000       2,220,000   2,220,000                    
Cost [2],[4],[7] 2,198,000       2,198,000   2,198,000                    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 3                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 4,612,000       4,612,000   4,612,000                    
Cost [2],[4],[7] 4,561,000       4,561,000   4,561,000                    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value 554,000 [7],[13] 221,000 [1],[11],[14]     554,000 [7],[13]   554,000 [7],[13]   221,000 [1],[11],[14]                
Cost 351,000 [7],[13] 208,000 [1],[11],[14]     351,000 [7],[13]   351,000 [7],[13]   208,000 [1],[11],[14]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (5,000) [2],[4],[7],[24] (6,000) [1],[8],[11],[12]     (5,000) [2],[4],[7],[24]   (5,000) [2],[4],[7],[24]   (6,000) [1],[8],[11],[12]                
Cost (10,000) [2],[4],[7],[24] (3,000) [1],[8],[11],[12]     (10,000) [2],[4],[7],[24]   (10,000) [2],[4],[7],[24]   (3,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: Ocular Therapeutix, Inc., Pharma-ceuticals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[18] 3,812,000       3,812,000   3,812,000                    
Cost [4],[18] 3,814,000       3,814,000   3,814,000                    
Investment, Identifier [Axis]: Offen Inc., Transportation: Cargo, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,694,000 [5],[7],[27] 3,627,000 [1],[9],[11],[26]     3,694,000 [5],[7],[27]   3,694,000 [5],[7],[27]   3,627,000 [1],[9],[11],[26]                
Cost 3,694,000 [5],[7],[27] 3,702,000 [1],[9],[11],[26]     3,694,000 [5],[7],[27]   3,694,000 [5],[7],[27]   3,702,000 [1],[9],[11],[26]                
Investment, Identifier [Axis]: Omni Intermediate Holdings, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 2,289,000     0   0   2,289,000                
Investment, Identifier [Axis]: Omni Intermediate Holdings, LLC, Transportation, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 8,318,000 [2],[4],[7] 5,995,000 [1],[8],[11],[15]     8,318,000 [2],[4],[7]   8,318,000 [2],[4],[7]   5,995,000 [1],[8],[11],[15]                
Cost 8,331,000 [2],[4],[7] 6,098,000 [1],[8],[11],[15]     8,331,000 [2],[4],[7]   8,331,000 [2],[4],[7]   6,098,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Options Technology Ltd., Computer Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,256,000 [2],[4],[7],[16] 2,251,000 [1],[8],[11],[17],[28]     2,256,000 [2],[4],[7],[16]   2,256,000 [2],[4],[7],[16]   2,251,000 [1],[8],[11],[17],[28]                
Cost 2,254,000 [2],[4],[7],[16] 2,266,000 [1],[8],[11],[17],[28]     2,254,000 [2],[4],[7],[16]   2,254,000 [2],[4],[7],[16]   2,266,000 [1],[8],[11],[17],[28]                
Investment, Identifier [Axis]: Oracle Vision Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,794,000 [4],[7],[16],[35] 2,753,000 [1],[8],[11],[17],[34]     2,794,000 [4],[7],[16],[35]   2,794,000 [4],[7],[16],[35]   2,753,000 [1],[8],[11],[17],[34]                
Cost 3,160,000 [4],[7],[16],[35] 3,151,000 [1],[8],[11],[17],[34]     3,160,000 [4],[7],[16],[35]   3,160,000 [4],[7],[16],[35]   3,151,000 [1],[8],[11],[17],[34]                
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 349,000 [4],[7],[16],[19] 342,000 [1],[8],[11],[17],[20]     349,000 [4],[7],[16],[19]   349,000 [4],[7],[16],[19]   342,000 [1],[8],[11],[17],[20]                
Cost 396,000 [4],[7],[16],[19] 395,000 [1],[8],[11],[17],[20]     396,000 [4],[7],[16],[19]   396,000 [4],[7],[16],[19]   395,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 593,000 [2],[4],[7],[16] 577,000 [1],[8],[11],[12],[17]     593,000 [2],[4],[7],[16]   593,000 [2],[4],[7],[16]   577,000 [1],[8],[11],[12],[17]                
Cost 585,000 [2],[4],[7],[16] 584,000 [1],[8],[11],[12],[17]     585,000 [2],[4],[7],[16]   585,000 [2],[4],[7],[16]   584,000 [1],[8],[11],[12],[17]                
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, Class A-2 Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 56,000 [7],[13] 41,000 [1],[11],[14]     56,000 [7],[13]   56,000 [7],[13]   41,000 [1],[11],[14]                
Cost 29,000 [7],[13] 29,000 [1],[11],[14]     29,000 [7],[13]   29,000 [7],[13]   29,000 [1],[11],[14]                
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,595,000 [2],[4],[7] 8,172,000 [1],[8],[11],[12]     9,595,000 [2],[4],[7]   9,595,000 [2],[4],[7]   8,172,000 [1],[8],[11],[12]                
Cost 9,384,000 [2],[4],[7] 8,116,000 [1],[8],[11],[12]     9,384,000 [2],[4],[7]   9,384,000 [2],[4],[7]   8,116,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: PDQ.Com Corporation, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 5,582,000 6,885,000     5,582,000   5,582,000   6,885,000                
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 721,000 727,000     721,000   721,000   727,000                
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 740,000 [4],[7],[16],[19],[24] 829,000 [1],[8],[11],[17],[20]     740,000 [4],[7],[16],[19],[24]   740,000 [4],[7],[16],[19],[24]   829,000 [1],[8],[11],[17],[20]                
Cost 829,000 [4],[7],[16],[19],[24] 825,000 [1],[8],[11],[17],[20]     829,000 [4],[7],[16],[19],[24]   829,000 [4],[7],[16],[19],[24]   825,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 797,000 [4],[7],[16],[18] 842,000 [1],[8],[11],[12],[17]     797,000 [4],[7],[16],[18]   797,000 [4],[7],[16],[18]   842,000 [1],[8],[11],[12],[17]                
Cost 846,000 [4],[7],[16],[18] 844,000 [1],[8],[11],[12],[17]     846,000 [4],[7],[16],[18]   846,000 [4],[7],[16],[18]   844,000 [1],[8],[11],[12],[17]                
Investment, Identifier [Axis]: Panoche Energy Center LLC, Electric, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,115,000 [7] 4,628,000 [1],[11]     4,115,000 [7]   4,115,000 [7]   4,628,000 [1],[11]                
Cost 3,956,000 [7] 4,430,000 [1],[11]     3,956,000 [7]   3,956,000 [7]   4,430,000 [1],[11]                
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), Health Care Equipment, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 2,665,000 [4],[7],[16],[32] 2,638,000 [1],[8],[11],[17],[29]     2,665,000 [4],[7],[16],[32]   2,665,000 [4],[7],[16],[32]   2,638,000 [1],[8],[11],[17],[29]                
Cost 2,835,000 [4],[7],[16],[32] $ 2,807,000 [1],[8],[11],[17],[29]     2,835,000 [4],[7],[16],[32]   2,835,000 [4],[7],[16],[32]   $ 2,807,000 [1],[8],[11],[17],[29]                
Investment, interest rate, paid in kind [1],[8],[11],[17],[29]   0.75%             0.75%                
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), Health Care Equipment, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 1,470,000 [2],[4],[7],[16] $ 1,455,000 [1],[8],[11],[15],[17]     1,470,000 [2],[4],[7],[16]   1,470,000 [2],[4],[7],[16]   $ 1,455,000 [1],[8],[11],[15],[17]                
Cost 1,500,000 [2],[4],[7],[16] 1,500,000 [1],[8],[11],[15],[17]     1,500,000 [2],[4],[7],[16]   1,500,000 [2],[4],[7],[16]   1,500,000 [1],[8],[11],[15],[17]                
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), Diversified Financial Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 2,351,000 [4],[7],[16],[19] 2,702,000 [1],[8],[11],[17],[20]     2,351,000 [4],[7],[16],[19]   2,351,000 [4],[7],[16],[19]   2,702,000 [1],[8],[11],[17],[20]                
Cost 2,497,000 [4],[7],[16],[19] 2,850,000 [1],[8],[11],[17],[20]     2,497,000 [4],[7],[16],[19]   2,497,000 [4],[7],[16],[19]   2,850,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), Diversified Financial Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 2,955,000 [2],[4],[7],[16] 3,159,000 [1],[8],[11],[12],[17]     2,955,000 [2],[4],[7],[16]   2,955,000 [2],[4],[7],[16]   3,159,000 [1],[8],[11],[12],[17]                
Cost 3,050,000 [2],[4],[7],[16] 3,264,000 [1],[8],[11],[12],[17]     3,050,000 [2],[4],[7],[16]   3,050,000 [2],[4],[7],[16]   3,264,000 [1],[8],[11],[12],[17]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class A                                  
Schedule of Investments [Line Items]                                  
Fair value 166,000 [7],[16] 165,000 [1],[11],[17]     166,000 [7],[16]   166,000 [7],[16]   165,000 [1],[11],[17]                
Cost 182,000 [7],[16] 182,000 [1],[11],[17]     182,000 [7],[16]   182,000 [7],[16]   182,000 [1],[11],[17]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class B                                  
Schedule of Investments [Line Items]                                  
Fair value 167,000 [7],[16] 162,000 [1],[11],[17]     167,000 [7],[16]   167,000 [7],[16]   162,000 [1],[11],[17]                
Cost 182,000 [7],[16] 182,000 [1],[11],[17]     182,000 [7],[16]   182,000 [7],[16]   182,000 [1],[11],[17]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class C                                  
Schedule of Investments [Line Items]                                  
Fair value 163,000 [7],[16] 157,000 [1],[11],[17]     163,000 [7],[16]   163,000 [7],[16]   157,000 [1],[11],[17]                
Cost 182,000 [7],[16] 182,000 [1],[11],[17]     182,000 [7],[16]   182,000 [7],[16]   182,000 [1],[11],[17]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class D                                  
Schedule of Investments [Line Items]                                  
Fair value 160,000 [7],[16] 158,000 [1],[11],[17]     160,000 [7],[16]   160,000 [7],[16]   158,000 [1],[11],[17]                
Cost 181,000 [7],[16] 181,000 [1],[11],[17]     181,000 [7],[16]   181,000 [7],[16]   181,000 [1],[11],[17]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class E                                  
Schedule of Investments [Line Items]                                  
Fair value 8,288,000 [7],[16] 8,154,000 [1],[11],[17]     8,288,000 [7],[16]   8,288,000 [7],[16]   8,154,000 [1],[11],[17]                
Cost 9,273,000 [7],[16] 9,273,000 [1],[11],[17]     9,273,000 [7],[16]   9,273,000 [7],[16]   9,273,000 [1],[11],[17]                
Investment, Identifier [Axis]: Permaconn BidCo Pty Ltd, Tele-communications, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,585,000 [4],[7],[16],[36] 2,728,000 [1],[8],[11],[17],[49]     2,585,000 [4],[7],[16],[36]   2,585,000 [4],[7],[16],[36]   2,728,000 [1],[8],[11],[17],[49]                
Cost 2,697,000 [4],[7],[16],[36] 2,864,000 [1],[8],[11],[17],[49]     2,697,000 [4],[7],[16],[36]   2,697,000 [4],[7],[16],[36]   2,864,000 [1],[8],[11],[17],[49]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,207,000 [2],[4],[7] 1,210,000 [1],[8],[11],[12]     1,207,000 [2],[4],[7]   1,207,000 [2],[4],[7]   1,210,000 [1],[8],[11],[12]                
Cost 1,203,000 [2],[4],[7] 1,209,000 [1],[8],[11],[12]     1,203,000 [2],[4],[7]   1,203,000 [2],[4],[7]   1,209,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 1,203,000 [7],[13] 823,000 [1],[11],[14]     1,203,000 [7],[13]   1,203,000 [7],[13]   823,000 [1],[11],[14]                
Cost 741,000 [7],[13] 741,000 [1],[11],[14]     741,000 [7],[13]   741,000 [7],[13]   741,000 [1],[11],[14]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (6,000) [2],[4],[7],[24] (9,000) [1],[8],[11],[12]     (6,000) [2],[4],[7],[24]   (6,000) [2],[4],[7],[24]   (9,000) [1],[8],[11],[12]                
Cost (8,000) [2],[4],[7],[24] (9,000) [1],[8],[11],[12]     (8,000) [2],[4],[7],[24]   (8,000) [2],[4],[7],[24]   (9,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 545,000 545,000     545,000   545,000   545,000                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 49,900,000 [4],[7] 48,490,000 [1],[8],[11],[12]     49,900,000 [4],[7]   49,900,000 [4],[7]   48,490,000 [1],[8],[11],[12]                
Cost $ 49,898,000 [4],[7] $ 48,487,000 [1],[8],[11],[12]     $ 49,898,000 [4],[7]   $ 49,898,000 [4],[7]   $ 48,487,000 [1],[8],[11],[12]                
Investment, interest rate, paid in kind 4.00% [4],[7] 4.00% [1],[8],[11],[12]     4.00% [4],[7]   4.00% [4],[7]   4.00% [1],[8],[11],[12]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class A                                  
Schedule of Investments [Line Items]                                  
Fair value $ 514,000 [7],[13] $ 438,000 [1],[11],[14]     $ 514,000 [7],[13]   $ 514,000 [7],[13]   $ 438,000 [1],[11],[14]                
Cost 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class B                                  
Schedule of Investments [Line Items]                                  
Fair value 173,000 [7],[13] 148,000 [1],[11],[14]     173,000 [7],[13]   173,000 [7],[13]   148,000 [1],[11],[14]                
Cost 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class CC                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Cost 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class D                                  
Schedule of Investments [Line Items]                                  
Fair value 50,000 [7],[13] 42,000 [1],[11],[14]     50,000 [7],[13]   50,000 [7],[13]   42,000 [1],[11],[14]                
Cost 0 [7],[13] 0 [1],[11],[14]     0 [7],[13]   0 [7],[13]   0 [1],[11],[14]                
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, Chemicals, Plastics & Rubber, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 0       0   0                    
Cost [7],[13] 0       0   0                    
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 929,000 [4],[5],[7],[18] 987,000 [1],[8],[9],[11],[26]     929,000 [4],[5],[7],[18]   929,000 [4],[5],[7],[18]   987,000 [1],[8],[9],[11],[26]                
Cost 990,000 [4],[5],[7],[18] 997,000 [1],[8],[9],[11],[26]     990,000 [4],[5],[7],[18]   990,000 [4],[5],[7],[18]   997,000 [1],[8],[9],[11],[26]                
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, Research & Consulting Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 12,509,000 [2],[4],[7] 12,510,000 [1],[8],[11],[12]     12,509,000 [2],[4],[7]   12,509,000 [2],[4],[7]   12,510,000 [1],[8],[11],[12]                
Cost 12,462,000 [2],[4],[7] 12,496,000 [1],[8],[11],[12]     12,462,000 [2],[4],[7]   12,462,000 [2],[4],[7]   12,496,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Premium Invest, Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,611,000 [4],[7],[16],[24],[32] 5,656,000 [1],[8],[11],[17],[29]     5,611,000 [4],[7],[16],[24],[32]   5,611,000 [4],[7],[16],[24],[32]   5,656,000 [1],[8],[11],[17],[29]                
Cost 5,829,000 [4],[7],[16],[24],[32] 5,804,000 [1],[8],[11],[17],[29]     5,829,000 [4],[7],[16],[24],[32]   5,829,000 [4],[7],[16],[24],[32]   5,804,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Premium Invest, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,859,000 2,882,000     2,859,000   2,859,000   2,882,000                
Investment, Identifier [Axis]: Preqin MC Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,739,000 [4],[7],[16],[27] 2,719,000 [1],[8],[11],[17],[28]     2,739,000 [4],[7],[16],[27]   2,739,000 [4],[7],[16],[27]   2,719,000 [1],[8],[11],[17],[28]                
Cost 2,727,000 [4],[7],[16],[27] 2,719,000 [1],[8],[11],[17],[28]     2,727,000 [4],[7],[16],[27]   2,727,000 [4],[7],[16],[27]   2,719,000 [1],[8],[11],[17],[28]                
Investment, Identifier [Axis]: Process Equipment, Inc. (ProcessBarron), Industrial Air & Material Handling Equipment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,302,000 [2],[4],[7] 4,907,000 [1],[8],[11],[15]     5,302,000 [2],[4],[7]   5,302,000 [2],[4],[7]   4,907,000 [1],[8],[11],[15]                
Cost 5,495,000 [2],[4],[7] 5,430,000 [1],[8],[11],[15]     5,495,000 [2],[4],[7]   5,495,000 [2],[4],[7]   5,430,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Process Equipment, Inc. (ProcessBarron), Industrial Air & Material Handling Equipment, First Lien Senior Secured Term Loan1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[26]   304,000             304,000                
Cost [1],[8],[11],[26]   337,000             337,000                
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 935,000 0     935,000   935,000   0                
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 281,000       281,000   281,000                    
Cost [7],[13] 281,000       281,000   281,000                    
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] 5,174,000       5,174,000   5,174,000                    
Cost [2],[4],[7],[24] 5,180,000       5,180,000   5,180,000                    
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] (25,000)       (25,000)   (25,000)                    
Cost [2],[4],[7],[24] (25,000)       (25,000)   (25,000)                    
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,014,000 0     1,014,000   1,014,000   0                
Investment, Identifier [Axis]: Professional Datasolutions, Inc. (PDI), Application Software, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,775,000 [2],[4],[7] 1,751,000 [1],[8],[11],[12]     1,775,000 [2],[4],[7]   1,775,000 [2],[4],[7]   1,751,000 [1],[8],[11],[12]                
Cost 1,803,000 [2],[4],[7] 1,821,000 [1],[8],[11],[12]     1,803,000 [2],[4],[7]   1,803,000 [2],[4],[7]   1,821,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 290,000 484,000     290,000   290,000   484,000                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,621,000 [4],[7],[27] 1,624,000 [1],[8],[11],[28]     1,621,000 [4],[7],[27]   1,621,000 [4],[7],[27]   1,624,000 [1],[8],[11],[28]                
Cost 1,614,000 [4],[7],[27] 1,619,000 [1],[8],[11],[28]     1,614,000 [4],[7],[27]   1,614,000 [4],[7],[27]   1,619,000 [1],[8],[11],[28]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 182,000 [7],[13] 172,000 [1],[11],[14]     182,000 [7],[13]   182,000 [7],[13]   172,000 [1],[11],[14]                
Cost 161,000 [7],[13] 161,000 [1],[11],[14]     161,000 [7],[13]   161,000 [7],[13]   161,000 [1],[11],[14]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 188,000 [4],[7],[24],[27] (7,000) [1],[8],[11],[28]     188,000 [4],[7],[24],[27]   188,000 [4],[7],[24],[27]   (7,000) [1],[8],[11],[28]                
Cost 186,000 [4],[7],[24],[27] (8,000) [1],[8],[11],[28]     186,000 [4],[7],[24],[27]   186,000 [4],[7],[24],[27]   (8,000) [1],[8],[11],[28]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Second Lien Senior Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 72,000 [7] 74,000 [1],[11]     72,000 [7]   72,000 [7]   74,000 [1],[11]                
Cost 81,000 [7] 81,000 [1],[11]     81,000 [7]   81,000 [7]   81,000 [1],[11]                
Investment, Identifier [Axis]: Proppants Holding, LLC, Energy: Oil & Gas, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Cost 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,531,000 [4],[7],[16],[24],[32] 1,365,000 [1],[8],[11],[17],[29]     1,531,000 [4],[7],[16],[24],[32]   1,531,000 [4],[7],[16],[24],[32]   1,365,000 [1],[8],[11],[17],[29]                
Cost 1,737,000 [4],[7],[16],[24],[32] 1,569,000 [1],[8],[11],[17],[29]     1,737,000 [4],[7],[16],[24],[32]   1,737,000 [4],[7],[16],[24],[32]   1,569,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 1,987,000 [4],[7],[16],[32] 2,017,000 [1],[8],[11],[17],[29]     1,987,000 [4],[7],[16],[32]   1,987,000 [4],[7],[16],[32]   2,017,000 [1],[8],[11],[17],[29]                
Cost 2,281,000 [4],[7],[16],[32] 2,275,000 [1],[8],[11],[17],[29]     2,281,000 [4],[7],[16],[32]   2,281,000 [4],[7],[16],[32]   2,275,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Protego Bidco B.V., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 629,000 792,000     629,000   629,000   792,000                
Investment, Identifier [Axis]: QPE7 SPV1 BidCo Pty Ltd, Consumer Cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,736,000 [4],[7],[16],[21] 1,821,000 [1],[8],[11],[17],[22]     1,736,000 [4],[7],[16],[21]   1,736,000 [4],[7],[16],[21]   1,821,000 [1],[8],[11],[17],[22]                
Cost 1,969,000 [4],[7],[16],[21] 1,965,000 [1],[8],[11],[17],[22]     1,969,000 [4],[7],[16],[21]   1,969,000 [4],[7],[16],[21]   1,965,000 [1],[8],[11],[17],[22]                
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 49,000       49,000   49,000                    
Cost [7],[13] 3,000       3,000   3,000                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 588,000       588,000   588,000                    
Cost [2],[4],[7] 586,000       586,000   586,000                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 156,000       156,000   156,000                    
Cost [7],[13] 144,000       144,000   144,000                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] (6,000)       (6,000)   (6,000)                    
Cost [2],[4],[7],[24] (7,000)       (7,000)   (7,000)                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 242,000 0     242,000   242,000   0                
Investment, Identifier [Axis]: Questel Unite, Business Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,768,000 [2],[4],[7],[16] 6,692,000 [1],[8],[11],[12],[17]     6,768,000 [2],[4],[7],[16]   6,768,000 [2],[4],[7],[16]   6,692,000 [1],[8],[11],[12],[17]                
Cost 6,867,000 [2],[4],[7],[16] 6,815,000 [1],[8],[11],[12],[17]     6,867,000 [2],[4],[7],[16]   6,867,000 [2],[4],[7],[16]   6,815,000 [1],[8],[11],[12],[17]                
Investment, Identifier [Axis]: R1 Holdings, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,820,000 2,623,000     1,820,000   1,820,000   2,623,000                
Investment, Identifier [Axis]: R1 Holdings, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,947,000 1,601,000     1,947,000   1,947,000   1,601,000                
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,988,000 [4],[7],[24],[27] 9,873,000 [1],[8],[11],[15]     5,988,000 [4],[7],[24],[27]   5,988,000 [4],[7],[24],[27]   9,873,000 [1],[8],[11],[15]                
Cost 5,815,000 [4],[7],[24],[27] 9,873,000 [1],[8],[11],[15]     5,815,000 [4],[7],[24],[27]   5,815,000 [4],[7],[24],[27]   9,873,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 110,000 [4],[7],[24],[27] 403,000 [1],[8],[11],[15]     110,000 [4],[7],[24],[27]   110,000 [4],[7],[24],[27]   403,000 [1],[8],[11],[15]                
Cost 63,000 [4],[7],[24],[27] 403,000 [1],[8],[11],[15]     63,000 [4],[7],[24],[27]   63,000 [4],[7],[24],[27]   403,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 12,723,000 [2],[4],[5],[7] 12,658,000 [1],[8],[9],[11],[12]     12,723,000 [2],[4],[5],[7]   12,723,000 [2],[4],[5],[7]   12,658,000 [1],[8],[9],[11],[12]                
Cost 12,658,000 [2],[4],[5],[7] 12,658,000 [1],[8],[9],[11],[12]     12,658,000 [2],[4],[5],[7]   12,658,000 [2],[4],[5],[7]   12,658,000 [1],[8],[9],[11],[12]                
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 469,000 [2],[4],[5],[7],[24] (25,000) [1],[8],[9],[11],[12]     469,000 [2],[4],[5],[7],[24]   469,000 [2],[4],[5],[7],[24]   (25,000) [1],[8],[9],[11],[12]                
Cost 488,000 [2],[4],[5],[7],[24] 0 [1],[8],[9],[11],[12]     488,000 [2],[4],[5],[7],[24]   488,000 [2],[4],[5],[7],[24]   0 [1],[8],[9],[11],[12]                
Investment, Identifier [Axis]: RA Outdoors, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 747,000 1,235,000     747,000   747,000   1,235,000                
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 9,323,000 [4],[7],[19] 9,438,000 [1],[8],[11],[33]     9,323,000 [4],[7],[19]   9,323,000 [4],[7],[19]   9,438,000 [1],[8],[11],[33]                
Cost 9,229,000 [4],[7],[19] 9,245,000 [1],[8],[11],[33]     9,229,000 [4],[7],[19]   9,229,000 [4],[7],[19]   9,245,000 [1],[8],[11],[33]                
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 1,987,000 [4],[7],[27] 1,274,000 [1],[8],[11],[12]     1,987,000 [4],[7],[27]   1,987,000 [4],[7],[27]   1,274,000 [1],[8],[11],[12]                
Cost 1,982,000 [4],[7],[27] 1,264,000 [1],[8],[11],[12]     1,982,000 [4],[7],[27]   1,982,000 [4],[7],[27]   1,264,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: RPX Corporation, Research & Consulting Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,708,000 [2],[4],[7] 7,144,000 [1],[8],[11],[12]     6,708,000 [2],[4],[7]   6,708,000 [2],[4],[7]   7,144,000 [1],[8],[11],[12]                
Cost 6,678,000 [2],[4],[7] 7,174,000 [1],[8],[11],[12]     6,678,000 [2],[4],[7]   6,678,000 [2],[4],[7]   7,174,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class A Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [5],[7],[13] 1,000 [1],[9],[11]     0 [5],[7],[13]   0 [5],[7],[13]   1,000 [1],[9],[11]                
Cost 4,000 [5],[7],[13] 4,000 [1],[9],[11]     4,000 [5],[7],[13]   4,000 [5],[7],[13]   4,000 [1],[9],[11]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class B Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Cost 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class C Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 38,000 [5],[7],[13] 155,000 [1],[9],[11],[14]     38,000 [5],[7],[13]   38,000 [5],[7],[13]   155,000 [1],[9],[11],[14]                
Cost 450,000 [5],[7],[13] 450,000 [1],[9],[11],[14]     450,000 [5],[7],[13]   450,000 [5],[7],[13]   450,000 [1],[9],[11],[14]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Cost 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 8,695,000 [2],[4],[5],[7] 9,761,000 [1],[8],[9],[11],[23]     8,695,000 [2],[4],[5],[7]   8,695,000 [2],[4],[5],[7]   9,761,000 [1],[8],[9],[11],[23]                
Cost 9,011,000 [2],[4],[5],[7] 10,032,000 [1],[8],[9],[11],[23]     9,011,000 [2],[4],[5],[7]   9,011,000 [2],[4],[5],[7]   10,032,000 [1],[8],[9],[11],[23]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 1,925,000 [2],[4],[5],[7] 1,480,000 [1],[8],[9],[11],[23]     1,925,000 [2],[4],[5],[7]   1,925,000 [2],[4],[5],[7]   1,480,000 [1],[8],[9],[11],[23]                
Cost 2,063,000 [2],[4],[5],[7] 1,587,000 [1],[8],[9],[11],[23]     2,063,000 [2],[4],[5],[7]   2,063,000 [2],[4],[5],[7]   1,587,000 [1],[8],[9],[11],[23]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,905,000 2,381,000     1,905,000   1,905,000   2,381,000                
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 12,772,000 [2],[4],[7] 12,708,000 [1],[8],[11],[15]     12,772,000 [2],[4],[7]   12,772,000 [2],[4],[7]   12,708,000 [1],[8],[11],[15]                
Cost 12,716,000 [2],[4],[7] 12,727,000 [1],[8],[11],[15]     12,716,000 [2],[4],[7]   12,716,000 [2],[4],[7]   12,727,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 566,000 [7],[13] 533,000 [1],[11],[14]     566,000 [7],[13]   566,000 [7],[13]   533,000 [1],[11],[14]                
Cost 533,000 [7],[13] 533,000 [1],[11],[14]     533,000 [7],[13]   533,000 [7],[13]   533,000 [1],[11],[14]                
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 500,000 [2],[4],[7] 238,000 [1],[8],[11],[15]     500,000 [2],[4],[7]   500,000 [2],[4],[7]   238,000 [1],[8],[11],[15]                
Cost 491,000 [2],[4],[7] 239,000 [1],[8],[11],[15]     491,000 [2],[4],[7]   491,000 [2],[4],[7]   239,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Randys Holdings, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 4,412,000 4,412,000     4,412,000   4,412,000   4,412,000                
Investment, Identifier [Axis]: Randys Holdings, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,326,000 1,571,000     1,326,000   1,326,000   1,571,000                
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 11,442,000 [2],[4],[7] 11,392,000 [1],[8],[11],[12]     11,442,000 [2],[4],[7]   11,442,000 [2],[4],[7]   11,392,000 [1],[8],[11],[12]                
Cost 11,320,000 [2],[4],[7] 11,379,000 [1],[8],[11],[12]     11,320,000 [2],[4],[7]   11,320,000 [2],[4],[7]   11,379,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, Partnership Equity                                  
Schedule of Investments [Line Items]                                  
Fair value 125,000 [7],[13] 125,000 [1],[11],[14]     125,000 [7],[13]   125,000 [7],[13]   125,000 [1],[11],[14]                
Cost 187,000 [7],[13] 187,000 [1],[11],[14]     187,000 [7],[13]   187,000 [7],[13]   187,000 [1],[11],[14]                
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,173,000 [2],[4],[7] 4,556,000 [1],[8],[11],[12]     4,173,000 [2],[4],[7]   4,173,000 [2],[4],[7]   4,556,000 [1],[8],[11],[12]                
Cost 4,684,000 [2],[4],[7] 4,706,000 [1],[8],[11],[12]     4,684,000 [2],[4],[7]   4,684,000 [2],[4],[7]   4,706,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, Partnership Equity                                  
Schedule of Investments [Line Items]                                  
Fair value 65,000 [7],[13] 152,000 [1],[11],[14]     65,000 [7],[13]   65,000 [7],[13]   152,000 [1],[11],[14]                
Cost 197,000 [7],[13] 197,000 [1],[11],[14]     197,000 [7],[13]   197,000 [7],[13]   197,000 [1],[11],[14]                
Investment, Identifier [Axis]: Rep Seko Merger Sub LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 725,000     0   0   725,000                
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,032,000 [2],[4],[5],[7] 4,243,000 [1],[8],[9],[11],[12]     2,032,000 [2],[4],[5],[7]   2,032,000 [2],[4],[5],[7]   4,243,000 [1],[8],[9],[11],[12]                
Cost 5,107,000 [2],[4],[5],[7] 5,107,000 [1],[8],[9],[11],[12]     5,107,000 [2],[4],[5],[7]   5,107,000 [2],[4],[5],[7]   5,107,000 [1],[8],[9],[11],[12]                
Investment, Identifier [Axis]: Resonetics, LLC, Health Care Equipment, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,886,000 [2],[4],[7] 3,926,000 [1],[8],[11],[12]     3,886,000 [2],[4],[7]   3,886,000 [2],[4],[7]   3,926,000 [1],[8],[11],[12]                
Cost 3,948,000 [2],[4],[7] 3,942,000 [1],[8],[11],[12]     3,948,000 [2],[4],[7]   3,948,000 [2],[4],[7]   3,942,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Reward Gateway (UK) Ltd, Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 600,000     0   0   600,000                
Investment, Identifier [Axis]: Reward Gateway (UK) Ltd, Precious Metals & Minerals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[34]   2,840,000             2,840,000                
Cost [1],[8],[11],[17],[34]   3,230,000             3,230,000                
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Finance Companies, Structured - Junior Note                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[16],[24] 20,129,000       20,129,000   20,129,000                    
Cost [7],[16],[24] 22,283,000       22,283,000   22,283,000                    
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Structured Junior Note                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 10,159,000 0     10,159,000   10,159,000   0                
Investment, Identifier [Axis]: Riedel Beheer B.V., Food & Beverage, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,035,000 [4],[7],[16],[19] 2,162,000 [1],[8],[11],[17],[20]     2,035,000 [4],[7],[16],[19]   2,035,000 [4],[7],[16],[19]   2,162,000 [1],[8],[11],[17],[20]                
Cost 2,254,000 [4],[7],[16],[19] 2,248,000 [1],[8],[11],[17],[20]     2,254,000 [4],[7],[16],[19]   2,254,000 [4],[7],[16],[19]   2,248,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Rocade Holdings LLC                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 30,000,000       30,000,000   30,000,000                    
Investment, Identifier [Axis]: Rocade Holdings LLC, Common LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value 504,000 0     504,000   504,000   0                
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, Common LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value [3],[7],[13] 504,000       504,000   504,000                    
Cost [3],[7],[13] 0       0   0                    
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, Preferred LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[3],[7] 58,850,000       58,850,000   58,850,000                    
Cost [2],[3],[7] $ 58,841,000       $ 58,841,000   $ 58,841,000                    
Investment, interest rate, paid in kind [2],[7] 11.40%       11.40%   11.40%                    
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred Equity                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 30,000,000 0     $ 30,000,000   $ 30,000,000   0                
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value $ 58,850,000 0     $ 58,850,000   $ 58,850,000   0                
Investment, interest rate, paid in kind 11.40%       11.40%   11.40%                    
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13],[45],[46] $ 1,251,000       $ 1,251,000   $ 1,251,000                    
Cost [7],[13],[45],[46] 1,252,000       1,252,000   1,252,000                    
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] 6,422,000       6,422,000   6,422,000                    
Cost [4],[7],[18] 6,423,000       6,423,000   6,423,000                    
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18],[24] (33,000)       (33,000)   (33,000)                    
Cost [4],[7],[18],[24] (33,000)       (33,000)   (33,000)                    
Investment, Identifier [Axis]: Rock Labor, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,103,000 0     1,103,000   1,103,000   0                
Investment, Identifier [Axis]: Royal Buyer, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,353,000 2,209,000     1,353,000   1,353,000   2,209,000                
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,737,000 [2],[4],[7],[24] 10,808,000 [1],[8],[11],[15]     6,737,000 [2],[4],[7],[24]   6,737,000 [2],[4],[7],[24]   10,808,000 [1],[8],[11],[15]                
Cost 6,703,000 [2],[4],[7],[24] 10,791,000 [1],[8],[11],[15]     6,703,000 [2],[4],[7],[24]   6,703,000 [2],[4],[7],[24]   10,791,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 387,000 [2],[4],[7],[24] 377,000 [1],[8],[11],[15]     387,000 [2],[4],[7],[24]   387,000 [2],[4],[7],[24]   377,000 [1],[8],[11],[15]                
Cost 378,000 [2],[4],[7],[24] 374,000 [1],[8],[11],[15]     378,000 [2],[4],[7],[24]   378,000 [2],[4],[7],[24]   374,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Royal Buyer, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,340,000 1,340,000     1,340,000   1,340,000   1,340,000                
Investment, Identifier [Axis]: Ruffalo Noel Levitz, LLC, Media Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,111,000 [2],[4],[7] 9,238,000 [1],[8],[11],[12]     9,111,000 [2],[4],[7]   9,111,000 [2],[4],[7]   9,238,000 [1],[8],[11],[12]                
Cost $ 9,490,000 [2],[4],[7] 9,445,000 [1],[8],[11],[12]     $ 9,490,000 [2],[4],[7]   $ 9,490,000 [2],[4],[7]   9,445,000 [1],[8],[11],[12]                
Investment, interest rate, paid in kind [2] 4.00%       4.00%   4.00%                    
Investment, Identifier [Axis]: SBP Holdings LP, CAF Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 1,598,000 0     $ 1,598,000   $ 1,598,000   0                
Investment, Identifier [Axis]: SBP Holdings LP, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 788,000 0     788,000   788,000   0                
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] 12,682,000       12,682,000   12,682,000                    
Cost [2],[4],[7],[24] 12,640,000       12,640,000   12,640,000                    
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] (30,000)       (30,000)   (30,000)                    
Cost [2],[4],[7],[24] (34,000)       (34,000)   (34,000)                    
Investment, Identifier [Axis]: SBP Holdings LP, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,065,000 0     1,065,000   1,065,000   0                
Investment, Identifier [Axis]: SISU ACQUISITIONCO., INC., Aerospace & Defense, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,837,000 [4],[7],[18] 6,376,000 [1],[8],[11],[12]     6,837,000 [4],[7],[18]   6,837,000 [4],[7],[18]   6,376,000 [1],[8],[11],[12]                
Cost 6,805,000 [4],[7],[18] 6,840,000 [1],[8],[11],[12]     6,805,000 [4],[7],[18]   6,805,000 [4],[7],[18]   6,840,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: SMART Financial Operations, LLC, Banking, Finance, Insurance & Real Estate, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 1,400,000 [5],[7],[13] 110,000 [1],[9],[11],[14]     1,400,000 [5],[7],[13]   1,400,000 [5],[7],[13]   110,000 [1],[9],[11],[14]                
Cost 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Investment, Identifier [Axis]: SN BUYER, LLC, Health Care Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 10,996,000 [2],[4],[7] 10,951,000 [1],[8],[11],[12]     10,996,000 [2],[4],[7]   10,996,000 [2],[4],[7]   10,951,000 [1],[8],[11],[12]                
Cost 10,999,000 [2],[4],[7] 10,972,000 [1],[8],[11],[12]     10,999,000 [2],[4],[7]   10,999,000 [2],[4],[7]   10,972,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   22,041,000             22,041,000                
Cost [1],[8],[11],[15]   22,046,000             22,046,000                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14]   516,000             516,000                
Cost [1],[11],[14]   516,000             516,000                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   (50,000)             (50,000)                
Cost [1],[8],[11],[15]   (49,000)             (49,000)                
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 3,944,000 4,664,000     3,944,000   3,944,000   4,664,000                
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,261,000 [4],[7],[16],[24],[30] 2,383,000 [1],[8],[11],[17],[31]     3,261,000 [4],[7],[16],[24],[30]   3,261,000 [4],[7],[16],[24],[30]   2,383,000 [1],[8],[11],[17],[31]                
Cost 3,409,000 [4],[7],[16],[24],[30] 2,566,000 [1],[8],[11],[17],[31]     3,409,000 [4],[7],[16],[24],[30]   3,409,000 [4],[7],[16],[24],[30]   2,566,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 11,443,000 [2],[4],[7] 11,792,000 [1],[8],[11],[12]     11,443,000 [2],[4],[7]   11,443,000 [2],[4],[7]   11,792,000 [1],[8],[11],[12]                
Cost 11,703,000 [2],[4],[7] 11,762,000 [1],[8],[11],[12]     11,703,000 [2],[4],[7]   11,703,000 [2],[4],[7]   11,762,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, Preferred Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 445,000 [7],[13] 460,000 [1],[11],[14]     445,000 [7],[13]   445,000 [7],[13]   460,000 [1],[11],[14]                
Cost 379,000 [7],[13] 372,000 [1],[11],[14]     379,000 [7],[13]   379,000 [7],[13]   372,000 [1],[11],[14]                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Acquisition Capex Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 15,000 1,751,000     15,000   15,000   1,751,000                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 2,298,000 [4],[7],[16],[19] 1,939,000 [1],[8],[11],[17],[29]     2,298,000 [4],[7],[16],[19]   2,298,000 [4],[7],[16],[19]   1,939,000 [1],[8],[11],[17],[29]                
Cost 2,212,000 [4],[7],[16],[19] 1,784,000 [1],[8],[11],[17],[29]     2,212,000 [4],[7],[16],[19]   2,212,000 [4],[7],[16],[19]   1,784,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 3,099,000 [4],[7],[16],[53] 3,886,000 [1],[8],[11],[17],[59]     3,099,000 [4],[7],[16],[53]   3,099,000 [4],[7],[16],[53]   3,886,000 [1],[8],[11],[17],[59]                
Cost 3,063,000 [4],[7],[16],[53] 3,738,000 [1],[8],[11],[17],[59]     3,063,000 [4],[7],[16],[53]   3,063,000 [4],[7],[16],[53]   3,738,000 [1],[8],[11],[17],[59]                
Investment, Identifier [Axis]: Scaled Agile, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 331,000 416,000     331,000   331,000   416,000                
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,764,000 [2],[4],[7],[24] 1,716,000 [1],[8],[11],[15]     1,764,000 [2],[4],[7],[24]   1,764,000 [2],[4],[7],[24]   1,716,000 [1],[8],[11],[15]                
Cost 1,780,000 [2],[4],[7],[24] 1,701,000 [1],[8],[11],[15]     1,780,000 [2],[4],[7],[24]   1,780,000 [2],[4],[7],[24]   1,701,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (7,000) [2],[4],[7],[24] (3,000) [1],[8],[11],[15]     (7,000) [2],[4],[7],[24]   (7,000) [2],[4],[7],[24]   (3,000) [1],[8],[11],[15]                
Cost (5,000) [2],[4],[7],[24] (6,000) [1],[8],[11],[15]     (5,000) [2],[4],[7],[24]   (5,000) [2],[4],[7],[24]   (6,000) [1],[8],[11],[15]                
Investment, Identifier [Axis]: Scaled Agile, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 336,000 336,000     336,000   336,000   336,000                
Investment, Identifier [Axis]: Scout Bidco B.V., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 2,270,000     0   0   2,270,000                
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[20]   6,310,000             6,310,000                
Cost [1],[8],[11],[17],[20]   6,286,000             6,286,000                
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[19] 3,271,000       3,271,000   3,271,000                    
Cost [4],[7],[16],[19] 3,348,000       3,348,000   3,348,000                    
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[16] 428,000       428,000   428,000                    
Cost [2],[4],[7],[16] 443,000       443,000   443,000                    
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (34,000) [4],[7],[16],[19],[24] (21,000) [1],[8],[11],[17],[20]     (34,000) [4],[7],[16],[19],[24]   (34,000) [4],[7],[16],[19],[24]   (21,000) [1],[8],[11],[17],[20]                
Cost (21,000) [4],[7],[16],[19],[24] (24,000) [1],[8],[11],[17],[20]     (21,000) [4],[7],[16],[19],[24]   (21,000) [4],[7],[16],[19],[24]   (24,000) [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Scout Bidco B.V., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,022,000 1,030,000     1,022,000   1,022,000   1,030,000                
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan                                  
Schedule of Investments [Line Items]                                  
Fair value   $ 0             $ 0       5,451,000        
Investment, interest rate, paid in kind   5.00%             5.00%                
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan, 2023 Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 3,176,000 $ 0     3,176,000   3,176,000   $ 0                
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan, Controlled                                  
Schedule of Investments [Line Items]                                  
Fair value $ 6,172,000 $ 6,020,000     $ 6,172,000   $ 6,172,000   $ 6,020,000       0        
Investment, interest rate, paid in kind 5.00% 5.00%     5.00%   5.00%   5.00%                
Investment, Identifier [Axis]: Security Holdings B.V, Common Equity Interest                                  
Schedule of Investments [Line Items]                                  
Fair value   $ 0             $ 0       24,825,000        
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series A, Controlled                                  
Schedule of Investments [Line Items]                                  
Fair value $ 373,000 575,000     $ 373,000   $ 373,000   575,000       0        
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series B, Controlled                                  
Schedule of Investments [Line Items]                                  
Fair value 34,790,000 53,728,000     34,790,000   34,790,000   53,728,000       0        
Investment, Identifier [Axis]: Security Holdings B.V, Senior Subordinated Loan                                  
Schedule of Investments [Line Items]                                  
Fair value   $ 0             $ 0       9,525,000        
Investment, interest rate, paid in kind   3.10%             3.10%                
Investment, Identifier [Axis]: Security Holdings B.V, Senior Subordinated Note, Controlled                                  
Schedule of Investments [Line Items]                                  
Fair value   $ 0             $ 0       0        
Investment, interest rate, paid in kind   5.00%             5.00%                
Investment, Identifier [Axis]: Security Holdings B.V, Senior Subordinated Term Loan, Controlled                                  
Schedule of Investments [Line Items]                                  
Fair value $ 10,847,000 $ 10,534,000     $ 10,847,000   $ 10,847,000   $ 10,534,000       0        
Investment, interest rate, paid in kind 3.10% 3.10%     3.10%   3.10%   3.10%                
Investment, Identifier [Axis]: Security Holdings B.V, Senior Unsecured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value   $ 0             $ 0       7,307,000        
Investment, interest rate, paid in kind   9.00%             9.00%                
Investment, Identifier [Axis]: Security Holdings B.V, Senior Unsecured Term Loan, Controlled                                  
Schedule of Investments [Line Items]                                  
Fair value $ 2,142,000 $ 2,015,000     $ 2,142,000   $ 2,142,000   $ 2,015,000       0        
Investment, interest rate, paid in kind 9.00% 9.00%     9.00%   9.00%   9.00%                
Investment, Identifier [Axis]: Security Holdings B.V., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 2,118,000 $ 2,134,000     $ 2,118,000   $ 2,118,000   $ 2,134,000                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Bridge Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,172,000 [7],[16],[40],[55] 6,020,000 [1],[11],[17],[47]     6,172,000 [7],[16],[40],[55]   6,172,000 [7],[16],[40],[55]   6,020,000 [1],[11],[17],[47]                
Cost $ 6,172,000 [7],[16],[40],[55] $ 6,020,000 [1],[11],[17],[47]     $ 6,172,000 [7],[16],[40],[55]   $ 6,172,000 [7],[16],[40],[55]   $ 6,020,000 [1],[11],[17],[47]                
Investment, interest rate, paid in kind 5.00% [7],[16],[40],[55] 5.00% [1],[11],[17],[47]     5.00% [7],[16],[40],[55]   5.00% [7],[16],[40],[55]   5.00% [1],[11],[17],[47]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Common Stock Series A                                  
Schedule of Investments [Line Items]                                  
Fair value $ 373,000 [7],[13],[16],[40],[55] $ 575,000 [1],[11],[14],[17],[47]     $ 373,000 [7],[13],[16],[40],[55]   $ 373,000 [7],[13],[16],[40],[55]   $ 575,000 [1],[11],[14],[17],[47]                
Cost 560,000 [7],[13],[16],[40],[55] 560,000 [1],[11],[14],[17],[47]     560,000 [7],[13],[16],[40],[55]   560,000 [7],[13],[16],[40],[55]   560,000 [1],[11],[14],[17],[47]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Common Stock Series B                                  
Schedule of Investments [Line Items]                                  
Fair value 34,790,000 [7],[13],[16],[40],[55] 53,728,000 [1],[11],[14],[17],[47]     34,790,000 [7],[13],[16],[40],[55]   34,790,000 [7],[13],[16],[40],[55]   53,728,000 [1],[11],[14],[17],[47]                
Cost 35,192,000 [7],[13],[16],[40],[55] 35,192,000 [1],[11],[14],[17],[47]     35,192,000 [7],[13],[16],[40],[55]   35,192,000 [7],[13],[16],[40],[55]   35,192,000 [1],[11],[14],[17],[47]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[16],[24],[40],[55] 3,176,000       3,176,000   3,176,000                    
Cost [7],[16],[24],[40],[55] $ 3,293,000       $ 3,293,000   $ 3,293,000                    
Investment, interest rate, paid in kind [7],[16],[24],[40],[55] 6.00%       6.00%   6.00%                    
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 10,847,000 [7],[16],[40],[55] 10,534,000 [1],[11],[17],[47]     $ 10,847,000 [7],[16],[40],[55]   $ 10,847,000 [7],[16],[40],[55]   10,534,000 [1],[11],[17],[47]                
Cost $ 10,846,000 [7],[16],[40],[55] $ 10,534,000 [1],[11],[17],[47]     $ 10,846,000 [7],[16],[40],[55]   $ 10,846,000 [7],[16],[40],[55]   $ 10,534,000 [1],[11],[17],[47]                
Investment, interest rate, paid in kind 3.10% [7],[16],[40],[55] 3.10% [1],[11],[17],[47]     3.10% [7],[16],[40],[55]   3.10% [7],[16],[40],[55]   3.10% [1],[11],[17],[47]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Unsecured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[17],[47]   $ 2,015,000             $ 2,015,000                
Cost [1],[11],[17],[47]   $ 2,164,000             $ 2,164,000                
Investment, interest rate, paid in kind [1],[11],[17],[47]   9.00%             9.00%                
Investment, Identifier [Axis]: Security Holdings B.V., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 1,059,000 $ 1,067,000     $ 1,059,000   $ 1,059,000   $ 1,067,000                
Investment, Identifier [Axis]: Security Holdings B.V., Revolver 1                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 529,000 0     529,000   529,000   0                
Investment, Identifier [Axis]: Security Holdings B.V.,Senior Unsecured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[16],[24],[40],[55] 2,142,000       2,142,000   2,142,000                    
Cost [7],[16],[24],[40],[55] $ 2,318,000       $ 2,318,000   $ 2,318,000                    
Investment, interest rate, paid in kind [7],[16],[24],[40],[55] 9.00%       9.00%   9.00%                    
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value $ 474,000 [4],[7],[16],[32] 348,000 [1],[8],[11],[17],[29]     $ 474,000 [4],[7],[16],[32]   $ 474,000 [4],[7],[16],[32]   348,000 [1],[8],[11],[17],[29]                
Cost 480,000 [4],[7],[16],[32] 331,000 [1],[8],[11],[17],[29]     480,000 [4],[7],[16],[32]   480,000 [4],[7],[16],[32]   331,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 452,000 [4],[7],[16],[32] 479,000 [1],[8],[11],[17],[29]     452,000 [4],[7],[16],[32]   452,000 [4],[7],[16],[32]   479,000 [1],[8],[11],[17],[29]                
Cost 441,000 [4],[7],[16],[32] 479,000 [1],[8],[11],[17],[29]     441,000 [4],[7],[16],[32]   441,000 [4],[7],[16],[32]   479,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 3                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[24],[32] 849,000       849,000   849,000                    
Cost [4],[7],[16],[24],[32] 870,000       870,000   870,000                    
Investment, Identifier [Axis]: Sereni Capital NV, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 673,000 0     673,000   673,000   0                
Investment, Identifier [Axis]: Sereni Capital NV, Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 109,000     0   0   109,000                
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 1,519,000       1,519,000   1,519,000                    
Cost [7],[13] 1,630,000       1,630,000   1,630,000                    
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4] 34,000       34,000   34,000                    
Cost [2],[4] 29,000       29,000   29,000                    
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Super Priority First Out                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[12]   7,148,000             7,148,000                
Cost [1],[8],[12]   7,228,000             7,228,000                
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Super Priority Second Out                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[12]   1,625,000             1,625,000                
Cost [1],[8],[12]   3,372,000             3,372,000                
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14],[17]   1,200,000             1,200,000                
Cost [1],[11],[14],[17]   1,200,000             1,200,000                
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15],[17]   33,720,000             33,720,000                
Cost [1],[8],[11],[15],[17]   33,720,000             33,720,000                
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13],[16] 1,140,000       1,140,000   1,140,000                    
Cost [7],[13],[16] 1,200,000       1,200,000   1,200,000                    
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[16] 33,836,000       33,836,000   33,836,000                    
Cost [2],[4],[7],[16] 33,800,000       33,800,000   33,800,000                    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Joint Venture, 89.01% Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[9],[17]   37,950,000             37,950,000                
Cost [1],[9],[17]   50,221,000             50,221,000                
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Joint Venture, Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value [3],[5],[16] 42,088,000       42,088,000   42,088,000                    
Cost [3],[5],[16] 50,221,000       50,221,000   50,221,000                    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 42,088,000 37,950,000     42,088,000   42,088,000   37,950,000       0        
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV LLC (Sierra JV)                                  
Schedule of Investments [Line Items]                                  
Contributed capital 110,100,000       110,100,000   110,100,000                    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV LLC (Sierra JV) | All Members Of Sierra JV                                  
Schedule of Investments [Line Items]                                  
Contributed capital 124,500,000       124,500,000   124,500,000                    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV LLC (Sierra JV) | MMALIC                                  
Schedule of Investments [Line Items]                                  
Contributed capital 14,500,000       14,500,000   14,500,000                    
Investment, Identifier [Axis]: Sinari Invest, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 665,000 0     665,000   665,000   0                
Investment, Identifier [Axis]: Sinari Invest, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[24],[32] 1,663,000       1,663,000   1,663,000                    
Cost [4],[7],[16],[24],[32] 1,727,000       1,727,000   1,727,000                    
Investment, Identifier [Axis]: SmartShift Group, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 3,440,000 0     3,440,000   3,440,000   0                
Investment, Identifier [Axis]: SmartShift Group, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,651,000 0     1,651,000   1,651,000   0                
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 275,000       275,000   275,000                    
Cost [7],[13] 275,000       275,000   275,000                    
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] 9,306,000       9,306,000   9,306,000                    
Cost [2],[4],[7],[24] 9,313,000       9,313,000   9,313,000                    
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] (41,000)       (41,000)   (41,000)                    
Cost [2],[4],[7],[24] (41,000)       (41,000)   (41,000)                    
Investment, Identifier [Axis]: Smartling, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 1,978,000     0   0   1,978,000                
Investment, Identifier [Axis]: Smartling, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,176,000 1,176,000     1,176,000   1,176,000   1,176,000                
Investment, Identifier [Axis]: Smartling, Inc., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 15,458,000 [4],[7],[18] 13,393,000 [1],[8],[11],[26]     15,458,000 [4],[7],[18]   15,458,000 [4],[7],[18]   13,393,000 [1],[8],[11],[26]                
Cost 15,346,000 [4],[7],[18] 13,445,000 [1],[8],[11],[26]     15,346,000 [4],[7],[18]   15,346,000 [4],[7],[18]   13,445,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Smartling, Inc., Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (9,000) [4],[7],[18],[24] (24,000) [1],[8],[11],[26]     (9,000) [4],[7],[18],[24]   (9,000) [4],[7],[18],[24]   (24,000) [1],[8],[11],[26]                
Cost (16,000) [4],[7],[18],[24] (19,000) [1],[8],[11],[26]     (16,000) [4],[7],[18],[24]   (16,000) [4],[7],[18],[24]   (19,000) [1],[8],[11],[26]                
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 4,138,000 [2],[4],[7] 4,196,000 [1],[8],[11],[28]     4,138,000 [2],[4],[7]   4,138,000 [2],[4],[7]   4,196,000 [1],[8],[11],[28]                
Cost 4,504,000 [2],[4],[7] 4,521,000 [1],[8],[11],[28]     4,504,000 [2],[4],[7]   4,504,000 [2],[4],[7]   4,521,000 [1],[8],[11],[28]                
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 560,000 [2],[4],[7] 565,000 [1],[8],[11],[28]     560,000 [2],[4],[7]   560,000 [2],[4],[7]   565,000 [1],[8],[11],[28]                
Cost 607,000 [2],[4],[7] 606,000 [1],[8],[11],[28]     607,000 [2],[4],[7]   607,000 [2],[4],[7]   606,000 [1],[8],[11],[28]                
Investment, Identifier [Axis]: Smile Brands Group, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 38,000     0   0   38,000                
Investment, Identifier [Axis]: Soho Square III Debtco II SARL, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,135,000 3,383,000     1,135,000   1,135,000   3,383,000                
Investment, Identifier [Axis]: Soho Square III Debtco II SARL, Diversified Capital Markets, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,297,000 [7],[16],[24] 5,616,000 [1],[11],[17]     4,297,000 [7],[16],[24]   4,297,000 [7],[16],[24]   5,616,000 [1],[11],[17]                
Cost $ 4,109,000 [7],[16],[24] $ 5,177,000 [1],[11],[17]     $ 4,109,000 [7],[16],[24]   $ 4,109,000 [7],[16],[24]   $ 5,177,000 [1],[11],[17]                
Investment, interest rate, paid in kind 9.50% [7],[16],[24] 9.50% [1],[11],[17]     9.50% [7],[16],[24]   9.50% [7],[16],[24]   9.50% [1],[11],[17]                
Investment, Identifier [Axis]: Solo Buyer, L.P., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 1,596,000 $ 1,995,000     $ 1,596,000   $ 1,596,000   $ 1,995,000                
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 15,094,000       15,094,000   15,094,000                    
Cost [2],[4],[7] 15,172,000       15,172,000   15,172,000                    
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 380,000       380,000   380,000                    
Cost [7],[13] 516,000       516,000   516,000                    
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 343,000       343,000   343,000                    
Cost [2],[4],[7] 356,000       356,000   356,000                    
Investment, Identifier [Axis]: Sound Point CLO XX, Ltd., Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value 871,000 [5],[16] 1,192,000 [1],[9],[17]     871,000 [5],[16]   871,000 [5],[16]   1,192,000 [1],[9],[17]                
Cost 1,948,000 [5],[16] 2,205,000 [1],[9],[17]     1,948,000 [5],[16]   1,948,000 [5],[16]   2,205,000 [1],[9],[17]                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 399,000 666,000     399,000   399,000   666,000                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,890,000 [2],[4],[7],[24] 1,621,000 [1],[8],[11],[15]     1,890,000 [2],[4],[7],[24]   1,890,000 [2],[4],[7],[24]   1,621,000 [1],[8],[11],[15]                
Cost 1,883,000 [2],[4],[7],[24] 1,623,000 [1],[8],[11],[15]     1,883,000 [2],[4],[7],[24]   1,883,000 [2],[4],[7],[24]   1,623,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 56,000 [2],[4],[7],[24] (4,000) [1],[8],[11],[15]     56,000 [2],[4],[7],[24]   56,000 [2],[4],[7],[24]   (4,000) [1],[8],[11],[15]                
Cost 56,000 [2],[4],[7],[24] (3,000) [1],[8],[11],[15]     56,000 [2],[4],[7],[24]   56,000 [2],[4],[7],[24]   (3,000) [1],[8],[11],[15]                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 98,000 156,000     98,000   98,000   156,000                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,875,000 7,500,000     1,875,000   1,875,000   7,500,000                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 11,461,000 [4],[7],[18],[24] 5,754,000 [1],[8],[11],[23]     11,461,000 [4],[7],[18],[24]   11,461,000 [4],[7],[18],[24]   5,754,000 [1],[8],[11],[23]                
Cost 11,399,000 [4],[7],[18],[24] 5,766,000 [1],[8],[11],[23]     11,399,000 [4],[7],[18],[24]   11,399,000 [4],[7],[18],[24]   5,766,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (24,000) [4],[7],[18],[24] (35,000) [1],[8],[11],[23]     (24,000) [4],[7],[18],[24]   (24,000) [4],[7],[18],[24]   (35,000) [1],[8],[11],[23]                
Cost (29,000) [4],[7],[18],[24] (34,000) [1],[8],[11],[23]     (29,000) [4],[7],[18],[24]   (29,000) [4],[7],[18],[24]   (34,000) [1],[8],[11],[23]                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,406,000 1,406,000     1,406,000   1,406,000   1,406,000                
Investment, Identifier [Axis]: Springbrook Software (SBRK Intermediate, Inc.), Enterprise Software & Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 13,727,000 [2],[4],[7] 20,510,000 [1],[8],[11],[26]     13,727,000 [2],[4],[7]   13,727,000 [2],[4],[7]   20,510,000 [1],[8],[11],[26]                
Cost 13,609,000 [2],[4],[7] 20,660,000 [1],[8],[11],[26]     13,609,000 [2],[4],[7]   13,609,000 [2],[4],[7]   20,660,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Springbrook Software (SBRK Intermediate, Inc.), Enterprise Software & Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 2,805,000 [2],[4],[7] 2,763,000 [1],[8],[11],[15]     2,805,000 [2],[4],[7]   2,805,000 [2],[4],[7]   2,763,000 [1],[8],[11],[15]                
Cost 2,758,000 [2],[4],[7] 2,763,000 [1],[8],[11],[15]     2,758,000 [2],[4],[7]   2,758,000 [2],[4],[7]   2,763,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Starnmeer B.V., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,487,000 [4],[7],[16],[27] 2,477,000 [1],[8],[11],[12],[17]     2,487,000 [4],[7],[16],[27]   2,487,000 [4],[7],[16],[27]   2,477,000 [1],[8],[11],[12],[17]                
Cost 2,474,000 [4],[7],[16],[27] 2,469,000 [1],[8],[11],[12],[17]     2,474,000 [4],[7],[16],[27]   2,474,000 [4],[7],[16],[27]   2,469,000 [1],[8],[11],[12],[17]                
Investment, Identifier [Axis]: Superjet Buyer, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,369,000 1,825,000     1,369,000   1,369,000   1,825,000                
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 12,836,000 [2],[4],[7] 12,860,000 [1],[8],[11],[12]     12,836,000 [2],[4],[7]   12,836,000 [2],[4],[7]   12,860,000 [1],[8],[11],[12]                
Cost 12,749,000 [2],[4],[7] 12,818,000 [1],[8],[11],[12]     12,749,000 [2],[4],[7]   12,749,000 [2],[4],[7]   12,818,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 441,000 [2],[4],[7],[24] (26,000) [1],[8],[11],[12]     441,000 [2],[4],[7],[24]   441,000 [2],[4],[7],[24]   (26,000) [1],[8],[11],[12]                
Cost 430,000 [2],[4],[7],[24] (31,000) [1],[8],[11],[12]     430,000 [2],[4],[7],[24]   430,000 [2],[4],[7],[24]   (31,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: Syniverse Holdings, Inc., Technology Distributors, Series A Preferred Equity                                  
Schedule of Investments [Line Items]                                  
Fair value 8,518,000 [7] 6,515,000 [1],[11]     8,518,000 [7]   8,518,000 [7]   6,515,000 [1],[11]                
Cost $ 8,451,000 [7] $ 7,945,000 [1],[11]     $ 8,451,000 [7]   $ 8,451,000 [7]   $ 7,945,000 [1],[11]                
Investment, interest rate, paid in kind 12.50% [7] 12.50% [1],[11]     12.50% [7]   12.50% [7]   12.50% [1],[11]                
Investment, Identifier [Axis]: Syntax Systems Ltd, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 1,933,000 $ 1,933,000     $ 1,933,000   $ 1,933,000   $ 1,933,000                
Investment, Identifier [Axis]: Syntax Systems Ltd, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 337,000 337,000     337,000   337,000   337,000                
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,896,000 [4],[7],[16],[18] 1,812,000 [1],[8],[11],[17],[26]     1,896,000 [4],[7],[16],[18]   1,896,000 [4],[7],[16],[18]   1,812,000 [1],[8],[11],[17],[26]                
Cost 1,987,000 [4],[7],[16],[18] 1,992,000 [1],[8],[11],[17],[26]     1,987,000 [4],[7],[16],[18]   1,987,000 [4],[7],[16],[18]   1,992,000 [1],[8],[11],[17],[26]                
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 647,000 [4],[7],[16],[18] 622,000 [1],[8],[11],[17],[26]     647,000 [4],[7],[16],[18]   647,000 [4],[7],[16],[18]   622,000 [1],[8],[11],[17],[26]                
Cost 668,000 [4],[7],[16],[18] 666,000 [1],[8],[11],[17],[26]     668,000 [4],[7],[16],[18]   668,000 [4],[7],[16],[18]   666,000 [1],[8],[11],[17],[26]                
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 69,000 [7],[13] 60,000 [1],[11],[14]     69,000 [7],[13]   69,000 [7],[13]   60,000 [1],[11],[14]                
Cost 50,000 [7],[13] 50,000 [1],[11],[14]     50,000 [7],[13]   50,000 [7],[13]   50,000 [1],[11],[14]                
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 2,385,000 [7] 2,110,000 [1],[11]     2,385,000 [7]   2,385,000 [7]   2,110,000 [1],[11]                
Cost $ 2,419,000 [7] $ 2,143,000 [1],[11]     $ 2,419,000 [7]   $ 2,419,000 [7]   $ 2,143,000 [1],[11]                
Investment, interest rate, paid in kind 7.80% [7] 7.80% [1],[11]     7.80% [7]   7.80% [7]   7.80% [1],[11]                
Investment, Identifier [Axis]: TANQUERAY BIDCO LIMITED, Technology. First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[31]   $ 1,557,000             $ 1,557,000                
Cost [1],[8],[11],[17],[31]   1,486,000             1,486,000                
Investment, Identifier [Axis]: TSM II Luxco 10 SARL, Chemical & Plastics, Senior Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17]   11,118,000             11,118,000                
Cost [1],[8],[11],[17]   $ 11,434,000             $ 11,434,000                
Investment, interest rate, paid in kind [1],[8],[11],[17]   9.30%             9.30%                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 1,681,000 $ 1,681,000     $ 1,681,000   $ 1,681,000   $ 1,681,000                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 177,000 177,000     177,000   177,000   177,000                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 600,000 [2],[4],[7] 591,000 [1],[8],[11],[15]     600,000 [2],[4],[7]   600,000 [2],[4],[7]   591,000 [1],[8],[11],[15]                
Cost 593,000 [2],[4],[7] 591,000 [1],[8],[11],[15]     593,000 [2],[4],[7]   593,000 [2],[4],[7]   591,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 5,000 [7],[13] 5,000 [1],[11],[14]     5,000 [7],[13]   5,000 [7],[13]   5,000 [1],[11],[14]                
Cost 5,000 [7],[13] 5,000 [1],[11],[14]     5,000 [7],[13]   5,000 [7],[13]   5,000 [1],[11],[14]                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (3,000) [2],[4],[7],[24] (4,000) [1],[8],[11],[15]     (3,000) [2],[4],[7],[24]   (3,000) [2],[4],[7],[24]   (4,000) [1],[8],[11],[15]                
Cost (3,000) [2],[4],[7],[24] (4,000) [1],[8],[11],[15]     (3,000) [2],[4],[7],[24]   (3,000) [2],[4],[7],[24]   (4,000) [1],[8],[11],[15]                
Investment, Identifier [Axis]: Tank Holding Corp, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 925,000 0     925,000   925,000   0                
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[23]   10,877,000             10,877,000                
Cost [1],[8],[11],[23]   10,876,000             10,876,000                
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] 7,811,000       7,811,000   7,811,000                    
Cost [4],[7],[18] 7,861,000       7,861,000   7,861,000                    
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18],[24] 2,102,000       2,102,000   2,102,000                    
Cost [4],[7],[18],[24] 2,061,000       2,061,000   2,061,000                    
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 663,000 [4],[7],[18],[24] 157,000 [1],[8],[11],[23]     663,000 [4],[7],[18],[24]   663,000 [4],[7],[18],[24]   157,000 [1],[8],[11],[23]                
Cost 669,000 [4],[7],[18],[24] 157,000 [1],[8],[11],[23]     669,000 [4],[7],[18],[24]   669,000 [4],[7],[18],[24]   157,000 [1],[8],[11],[23]                
Investment, Identifier [Axis]: Tank Holding Corp, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 189,000 698,000     189,000   189,000   698,000                
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Capex Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,104,000 1,088,000     1,104,000   1,104,000   1,088,000                
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Technology. First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[30] 1,603,000       1,603,000   1,603,000                    
Cost [4],[7],[16],[30] 1,498,000       1,498,000   1,498,000                    
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Partnership Equity                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 401,000       401,000   401,000                    
Cost [7],[13] 400,000       400,000   400,000                    
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [7] 589,000       589,000   589,000                    
Cost [7] 588,000       588,000   588,000                    
Investment, Identifier [Axis]: Team Car Care, LLC, Automotive, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 10,565,000 [2],[4],[5],[7] 11,970,000 [1],[8],[9],[11],[12]     10,565,000 [2],[4],[5],[7]   10,565,000 [2],[4],[5],[7]   11,970,000 [1],[8],[9],[11],[12]                
Cost 10,650,000 [2],[4],[5],[7] 12,104,000 [1],[8],[9],[11],[12]     10,650,000 [2],[4],[5],[7]   10,650,000 [2],[4],[5],[7]   12,104,000 [1],[8],[9],[11],[12]                
Investment, Identifier [Axis]: Team Services Group, Services: Consumer, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,543,000 [4],[5],[27] 9,345,000 [1],[8],[9],[11],[28]     9,543,000 [4],[5],[27]   9,543,000 [4],[5],[27]   9,345,000 [1],[8],[9],[11],[28]                
Cost 9,762,000 [4],[5],[27] 9,837,000 [1],[8],[9],[11],[28]     9,762,000 [4],[5],[27]   9,762,000 [4],[5],[27]   9,837,000 [1],[8],[9],[11],[28]                
Investment, Identifier [Axis]: Team Services Group, Services: Consumer, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,500,000 [4],[5],[7],[27] 4,700,000 [1],[8],[9],[11],[28]     4,500,000 [4],[5],[7],[27]   4,500,000 [4],[5],[7],[27]   4,700,000 [1],[8],[9],[11],[28]                
Cost 4,975,000 [4],[5],[7],[27] 4,975,000 [1],[8],[9],[11],[28]     4,975,000 [4],[5],[7],[27]   4,975,000 [4],[5],[7],[27]   4,975,000 [1],[8],[9],[11],[28]                
Investment, Identifier [Axis]: Techone B.V., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 302,000 203,000     302,000   302,000   203,000                
Investment, Identifier [Axis]: Techone B.V., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,647,000 [4],[7],[16],[19] 3,578,000 [1],[8],[11],[17],[20]     3,647,000 [4],[7],[16],[19]   3,647,000 [4],[7],[16],[19]   3,578,000 [1],[8],[11],[17],[20]                
Cost 3,798,000 [4],[7],[16],[19] 3,788,000 [1],[8],[11],[17],[20]     3,798,000 [4],[7],[16],[19]   3,798,000 [4],[7],[16],[19]   3,788,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Techone B.V., Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 191,000 [4],[7],[16],[19] 281,000 [1],[8],[11],[17],[20]     191,000 [4],[7],[16],[19]   191,000 [4],[7],[16],[19]   281,000 [1],[8],[11],[17],[20]                
Cost 189,000 [4],[7],[16],[19] 296,000 [1],[8],[11],[17],[20]     189,000 [4],[7],[16],[19]   189,000 [4],[7],[16],[19]   296,000 [1],[8],[11],[17],[20]                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 6,220,000       6,220,000   6,220,000                    
Cost [2],[4],[7] 6,183,000       6,183,000   6,183,000                    
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   871,000             871,000                
Cost [1],[8],[11],[12]   869,000             869,000                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   5,368,000             5,368,000                
Cost [1],[8],[11],[12]   5,349,000             5,349,000                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (8,000) [2],[4],[7],[24] (13,000) [1],[8],[11],[12]     (8,000) [2],[4],[7],[24]   (8,000) [2],[4],[7],[24]   (13,000) [1],[8],[11],[12]                
Cost (14,000) [2],[4],[7],[24] (16,000) [1],[8],[11],[12]     (14,000) [2],[4],[7],[24]   (14,000) [2],[4],[7],[24]   (16,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,129,000 1,129,000     1,129,000   1,129,000   1,129,000                
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Partnership Equity                                  
Schedule of Investments [Line Items]                                  
Fair value 141,000 [7],[13] 255,000 [1],[11],[14]     141,000 [7],[13]   141,000 [7],[13]   255,000 [1],[11],[14]                
Cost 239,000 [7],[13] 239,000 [1],[11],[14]     239,000 [7],[13]   239,000 [7],[13]   239,000 [1],[11],[14]                
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 264,000 [7] 259,000 [1],[11]     264,000 [7]   264,000 [7]   259,000 [1],[11]                
Cost $ 267,000 [7] $ 259,000 [1],[11]     $ 267,000 [7]   $ 267,000 [7]   $ 259,000 [1],[11]                
Investment, interest rate, paid in kind 4.00% [7] 4.00% [1],[11]     4.00% [7]   4.00% [7]   4.00% [1],[11]                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value $ 832,000 [2],[4],[7],[24] $ 798,000 [1],[8],[11],[12]     $ 832,000 [2],[4],[7],[24]   $ 832,000 [2],[4],[7],[24]   $ 798,000 [1],[8],[11],[12]                
Cost 782,000 [2],[4],[7],[24] 779,000 [1],[8],[11],[12]     782,000 [2],[4],[7],[24]   782,000 [2],[4],[7],[24]   779,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [2],[4],[7],[24] (9,000) [1],[8],[11],[12]     0 [2],[4],[7],[24]   0 [2],[4],[7],[24]   (9,000) [1],[8],[11],[12]                
Cost (10,000) [2],[4],[7],[24] (12,000) [1],[8],[11],[12]     (10,000) [2],[4],[7],[24]   (10,000) [2],[4],[7],[24]   (12,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,452,000 [4],[7],[27] 3,380,000 [1],[8],[11],[28]     3,452,000 [4],[7],[27]   3,452,000 [4],[7],[27]   3,380,000 [1],[8],[11],[28]                
Cost 3,425,000 [4],[7],[27] 3,366,000 [1],[8],[11],[28]     3,425,000 [4],[7],[27]   3,425,000 [4],[7],[27]   3,366,000 [1],[8],[11],[28]                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,811,000 2,811,000     2,811,000   2,811,000   2,811,000                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 827,000 827,000     827,000   827,000   827,000                
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] 16,613,000       16,613,000   16,613,000                    
Cost [4],[7],[18] 16,400,000       16,400,000   16,400,000                    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18],[24] (13,000)       (13,000)   (13,000)                    
Cost [4],[7],[18],[24] (52,000)       (52,000)   (52,000)                    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [7] 4,724,000       4,724,000   4,724,000                    
Cost [7] $ 4,709,000       $ 4,709,000   $ 4,709,000                    
Investment, interest rate, paid in kind [7] 12.50%       12.50%   12.50%                    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[23]   25,979,000             25,979,000                
Cost [1],[8],[11],[23]   25,927,000             25,927,000                
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11]   5,547,000             5,547,000                
Cost [1],[11]   $ 5,536,000             $ 5,536,000                
Investment, interest rate, paid in kind [1],[11]   11.00%             11.00%                
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 3,229,000 $ 2,826,000     $ 3,229,000   $ 3,229,000   $ 2,826,000                
Investment, Identifier [Axis]: The Hilb Group, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 503,000 1,182,000     503,000   503,000   1,182,000                
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18],[24] 14,102,000       14,102,000   14,102,000                    
Cost [4],[7],[18],[24] 14,042,000       14,042,000   14,042,000                    
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[26]   1,578,000             1,578,000                
Cost [1],[8],[11],[26]   1,598,000             1,598,000                
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[26]   5,560,000             5,560,000                
Cost [1],[8],[11],[26]   5,558,000             5,558,000                
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 3                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[26]   14,178,000             14,178,000                
Cost [1],[8],[11],[26]   14,183,000             14,183,000                
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Partnership Equity                                  
Schedule of Investments [Line Items]                                  
Fair value 1,212,000 [7],[13] 1,019,000 [1],[11],[14]     1,212,000 [7],[13]   1,212,000 [7],[13]   1,019,000 [1],[11],[14]                
Cost 677,000 [7],[13] 677,000 [1],[11],[14]     677,000 [7],[13]   677,000 [7],[13]   677,000 [1],[11],[14]                
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 12,397,000 [2],[4],[7] 12,322,000 [1],[8],[11],[15]     12,397,000 [2],[4],[7]   12,397,000 [2],[4],[7]   12,322,000 [1],[8],[11],[15]                
Cost 12,307,000 [2],[4],[7] 12,289,000 [1],[8],[11],[15]     12,307,000 [2],[4],[7]   12,307,000 [2],[4],[7]   12,289,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: Thompson Rivers LLC                                  
Schedule of Investments [Line Items]                                  
Contributed capital                               $ 75,000,000  
Investment, Identifier [Axis]: Thompson Rivers LLC, Investment Funds & Vehicles, 16.0% Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value [1]   30,339,000             30,339,000                
Cost [1]   46,622,000             46,622,000                
Investment, Identifier [Axis]: Thompson Rivers LLC, Investment Funds & Vehicles, Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value [3],[13] 13,557,000       13,557,000   13,557,000                    
Cost [3],[13] 29,687,000       29,687,000   29,687,000                    
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 13,557,000 30,339,000     13,557,000   13,557,000   30,339,000       84,438,000        
Investment, Identifier [Axis]: Thompsonn Rivers LLC                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 0     0   0   0                
Contributed capital 79,411,000 79,411,000     79,411,000   79,411,000   79,411,000                
Investment, Identifier [Axis]: Total Safety U.S. Inc., Diversified Support Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 5,539,000 [2],[4] 5,801,000 [1],[8],[12]     5,539,000 [2],[4]   5,539,000 [2],[4]   5,801,000 [1],[8],[12]                
Cost 5,762,000 [2],[4] 5,996,000 [1],[8],[12]     5,762,000 [2],[4]   5,762,000 [2],[4]   5,996,000 [1],[8],[12]                
Investment, Identifier [Axis]: Total Safety U.S. Inc., Diversified Support Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 3,679,000 [2],[4],[7] 3,561,000 [1],[8],[11],[12]     3,679,000 [2],[4],[7]   3,679,000 [2],[4],[7]   3,561,000 [1],[8],[11],[12]                
Cost $ 3,679,000 [2],[4],[7] $ 3,561,000 [1],[8],[11],[12]     $ 3,679,000 [2],[4],[7]   $ 3,679,000 [2],[4],[7]   $ 3,561,000 [1],[8],[11],[12]                
Investment, interest rate, paid in kind 5.00% [2],[4],[7] 5.00% [1],[8],[11],[12]     5.00% [2],[4],[7]   5.00% [2],[4],[7]   5.00% [1],[8],[11],[12]                
Investment, Identifier [Axis]: Trader Corporation, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 346,000 $ 345,000     $ 346,000   $ 346,000   $ 345,000                
Investment, Identifier [Axis]: Trader Corporation, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,542,000 [4],[7],[16],[60] 4,486,000 [1],[8],[11],[17],[61]     4,542,000 [4],[7],[16],[60]   4,542,000 [4],[7],[16],[60]   4,486,000 [1],[8],[11],[17],[61]                
Cost 4,437,000 [4],[7],[16],[60] 4,450,000 [1],[8],[11],[17],[61]     4,437,000 [4],[7],[16],[60]   4,437,000 [4],[7],[16],[60]   4,450,000 [1],[8],[11],[17],[61]                
Investment, Identifier [Axis]: Trader Corporation, Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value (3,000) [4],[7],[16],[24],[60] (9,000) [1],[8],[11],[17],[61]     (3,000) [4],[7],[16],[24],[60]   (3,000) [4],[7],[16],[24],[60]   (9,000) [1],[8],[11],[17],[61]                
Cost (7,000) [4],[7],[16],[24],[60] (9,000) [1],[8],[11],[17],[61]     (7,000) [4],[7],[16],[24],[60]   (7,000) [4],[7],[16],[24],[60]   (9,000) [1],[8],[11],[17],[61]                
Investment, Identifier [Axis]: Transit Technologies LLC, Software, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,035,000 [2],[4],[7] 5,872,000 [1],[8],[11],[28]     6,035,000 [2],[4],[7]   6,035,000 [2],[4],[7]   5,872,000 [1],[8],[11],[28]                
Cost 6,004,000 [2],[4],[7] 5,987,000 [1],[8],[11],[28]     6,004,000 [2],[4],[7]   6,004,000 [2],[4],[7]   5,987,000 [1],[8],[11],[28]                
Investment, Identifier [Axis]: Transportation Insight, LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 10,562,000 [4],[7],[27] 11,032,000 [1],[8],[11],[12]     10,562,000 [4],[7],[27]   10,562,000 [4],[7],[27]   11,032,000 [1],[8],[11],[12]                
Cost 11,118,000 [4],[7],[27] 11,161,000 [1],[8],[11],[12]     11,118,000 [4],[7],[27]   11,118,000 [4],[7],[27]   11,161,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Trident Maritime Systems, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 13,255,000 [2],[4],[7] 14,570,000 [1],[8],[11]     13,255,000 [2],[4],[7]   13,255,000 [2],[4],[7]   14,570,000 [1],[8],[11]                
Cost 14,529,000 [2],[4],[7] 14,597,000 [1],[8],[11]     14,529,000 [2],[4],[7]   14,529,000 [2],[4],[7]   14,597,000 [1],[8],[11]                
Investment, Identifier [Axis]: Trintech, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 383,000 0     383,000   383,000   0                
Investment, Identifier [Axis]: Trintech, Inc., Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] 6,755,000       6,755,000   6,755,000                    
Cost [4],[7],[18] 6,760,000       6,760,000   6,760,000                    
Investment, Identifier [Axis]: Trintech, Inc., Technology, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18],[24] 137,000       137,000   137,000                    
Cost [4],[7],[18],[24] 137,000       137,000   137,000                    
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Automotive Parts & Equipment, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 18,983,000 [2],[4],[7] 18,756,000 [1],[8],[11],[15]     18,983,000 [2],[4],[7]   18,983,000 [2],[4],[7]   18,756,000 [1],[8],[11],[15]                
Cost 18,951,000 [2],[4],[7] 19,017,000 [1],[8],[11],[15]     18,951,000 [2],[4],[7]   18,951,000 [2],[4],[7]   19,017,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [5],[7],[13] 0 [1],[9],[11]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11]                
Cost 0 [5],[7],[13] 0 [1],[9],[11]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11]                
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Preferred Unit                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Cost 0 [5],[7],[13] 0 [1],[9],[11],[14]     0 [5],[7],[13]   0 [5],[7],[13]   0 [1],[9],[11],[14]                
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, Class A LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[11],[14]   512,000             512,000                
Cost [1],[11],[14]   481,000             481,000                
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, Class A LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value [7] 1,192,000       1,192,000   1,192,000                    
Cost [7] 481,000       481,000   481,000                    
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 6,758,000       6,758,000   6,758,000                    
Cost [2],[4],[7] 6,748,000       6,748,000   6,748,000                    
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[28]   3,075,000             3,075,000                
Cost [1],[8],[11],[28]   3,094,000             3,094,000                
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   3,750,000             3,750,000                
Cost [1],[8],[11],[12]   3,765,000             3,765,000                
Investment, Identifier [Axis]: Turbo Buyer, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,350,000 1,350,000     1,350,000   1,350,000   1,350,000                
Investment, Identifier [Axis]: Turbo Buyer, Inc., Finance Companies, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 7,970,000 [2],[4],[7] 8,061,000 [1],[8],[11],[12]     7,970,000 [2],[4],[7]   7,970,000 [2],[4],[7]   8,061,000 [1],[8],[11],[12]                
Cost 8,178,000 [2],[4],[7] 8,187,000 [1],[8],[11],[12]     8,178,000 [2],[4],[7]   8,178,000 [2],[4],[7]   8,187,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Turnberry Solutions, Inc., Consumer Cyclical, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,890,000 [2],[4],[7] 4,900,000 [1],[8],[11],[15]     4,890,000 [2],[4],[7]   4,890,000 [2],[4],[7]   4,900,000 [1],[8],[11],[15]                
Cost 4,877,000 [2],[4],[7] 4,900,000 [1],[8],[11],[15]     4,877,000 [2],[4],[7]   4,877,000 [2],[4],[7]   4,900,000 [1],[8],[11],[15]                
Investment, Identifier [Axis]: U.S. Silica Company, Metal & Glass Containers, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[17],[26]   1,439,000             1,439,000                
Cost [1],[8],[17],[26]   1,457,000             1,457,000                
Investment, Identifier [Axis]: UKFast Leaders Limited, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 10,304,000 [4],[7],[16],[30] 9,677,000 [1],[8],[11],[17],[31]     10,304,000 [4],[7],[16],[30]   10,304,000 [4],[7],[16],[30]   9,677,000 [1],[8],[11],[17],[31]                
Cost $ 11,798,000 [4],[7],[16],[30] 11,441,000 [1],[8],[11],[17],[31]     $ 11,798,000 [4],[7],[16],[30]   $ 11,798,000 [4],[7],[16],[30]   11,441,000 [1],[8],[11],[17],[31]                
Investment, interest rate, paid in kind [4],[7],[16],[30] 3.40%       3.40%   3.40%                    
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), Legal Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[18] $ 9,932,000       $ 9,932,000   $ 9,932,000                    
Cost [4],[7],[18] 10,041,000       10,041,000   10,041,000                    
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), Legal Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   15,390,000             15,390,000                
Cost [1],[8],[11],[15]   16,045,000             16,045,000                
Investment, Identifier [Axis]: USLS Acquisition, Inc.(f/k/a US Legal Support, Inc.), Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,588,000 3,629,000     2,588,000   2,588,000   3,629,000                
Investment, Identifier [Axis]: Union Bidco Limited, Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 79,000 78,000     79,000   79,000   78,000                
Investment, Identifier [Axis]: Union Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 828,000 [4],[7],[16],[30] 847,000 [1],[8],[11],[17],[31]     828,000 [4],[7],[16],[30]   828,000 [4],[7],[16],[30]   847,000 [1],[8],[11],[17],[31]                
Cost 872,000 [4],[7],[16],[30] 870,000 [1],[8],[11],[17],[31]     872,000 [4],[7],[16],[30]   872,000 [4],[7],[16],[30]   870,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 655,000 1,170,000     655,000   655,000   1,170,000                
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Healthcare, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 1,303,000 [4],[7],[16],[19] 1,180,000 [1],[8],[11],[17],[29]     1,303,000 [4],[7],[16],[19]   1,303,000 [4],[7],[16],[19]   1,180,000 [1],[8],[11],[17],[29]                
Cost 1,702,000 [4],[7],[16],[19] 1,184,000 [1],[8],[11],[17],[29]     1,702,000 [4],[7],[16],[19]   1,702,000 [4],[7],[16],[19]   1,184,000 [1],[8],[11],[17],[29]                
Investment, Identifier [Axis]: Unither (Uniholding), Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 459,000 0     459,000   459,000   0                
Investment, Identifier [Axis]: Unither (Uniholding), Pharma-ceuticals, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [4],[7],[16],[19] 1,947,000       1,947,000   1,947,000                    
Cost [4],[7],[16],[19] 1,954,000       1,954,000   1,954,000                    
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 1,513,000 [4],[7],[16],[19] 1,585,000 [1],[8],[11],[17],[20]     1,513,000 [4],[7],[16],[19]   1,513,000 [4],[7],[16],[19]   1,585,000 [1],[8],[11],[17],[20]                
Cost $ 1,716,000 [4],[7],[16],[19] 1,712,000 [1],[8],[11],[17],[20]     $ 1,716,000 [4],[7],[16],[19]   $ 1,716,000 [4],[7],[16],[19]   1,712,000 [1],[8],[11],[17],[20]                
Investment, interest rate, paid in kind [19] 1.80%       1.80%   1.80%                    
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value $ 3,352,000 [2],[4],[7],[16] 3,483,000 [1],[8],[11],[12],[17]     $ 3,352,000 [2],[4],[7],[16]   $ 3,352,000 [2],[4],[7],[16]   3,483,000 [1],[8],[11],[12],[17]                
Cost $ 3,472,000 [2],[4],[7],[16] 3,465,000 [1],[8],[11],[12],[17]     $ 3,472,000 [2],[4],[7],[16]   $ 3,472,000 [2],[4],[7],[16]   3,465,000 [1],[8],[11],[12],[17]                
Investment, interest rate, paid in kind [2] 1.80%       1.80%   1.80%                    
Investment, Identifier [Axis]: VOYA CLO 2015-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value $ 91,000 [5],[16] 91,000 [1],[9],[17]     $ 91,000 [5],[16]   $ 91,000 [5],[16]   91,000 [1],[9],[17]                
Cost 2,541,000 [5],[16] 2,930,000 [1],[9],[17]     2,541,000 [5],[16]   2,541,000 [5],[16]   2,930,000 [1],[9],[17]                
Investment, Identifier [Axis]: VOYA CLO 2016-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes                                  
Schedule of Investments [Line Items]                                  
Fair value 1,398,000 [5],[16] 1,551,000 [1],[9],[17]     1,398,000 [5],[16]   1,398,000 [5],[16]   1,551,000 [1],[9],[17]                
Cost 2,868,000 [5],[16] 3,301,000 [1],[9],[17]     2,868,000 [5],[16]   2,868,000 [5],[16]   3,301,000 [1],[9],[17]                
Investment, Identifier [Axis]: Validity, Inc., IT Consulting & Other Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 4,783,000 [4],[7],[27] 4,673,000 [1],[8],[11],[26]     4,783,000 [4],[7],[27]   4,783,000 [4],[7],[27]   4,673,000 [1],[8],[11],[26]                
Cost 4,734,000 [4],[7],[27] 4,713,000 [1],[8],[11],[26]     4,734,000 [4],[7],[27]   4,734,000 [4],[7],[27]   4,713,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 2,000 [5],[7],[13] 2,000 [1],[9],[11],[14]     2,000 [5],[7],[13]   2,000 [5],[7],[13]   2,000 [1],[9],[11],[14]                
Cost 60,000 [5],[7],[13] 60,000 [1],[9],[11],[14]     60,000 [5],[7],[13]   60,000 [5],[7],[13]   60,000 [1],[9],[11],[14]                
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Warrants                                  
Schedule of Investments [Line Items]                                  
Fair value 3,000 [5],[7],[13] 3,000 [1],[9],[11],[14]     3,000 [5],[7],[13]   3,000 [5],[7],[13]   3,000 [1],[9],[11],[14]                
Cost 72,000 [5],[7],[13] 72,000 [1],[9],[11],[14]     72,000 [5],[7],[13]   72,000 [5],[7],[13]   72,000 [1],[9],[11],[14]                
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 3,474,000 [4],[7],[16],[30] 3,238,000 [1],[8],[11],[17],[34]     3,474,000 [4],[7],[16],[30]   3,474,000 [4],[7],[16],[30]   3,238,000 [1],[8],[11],[17],[34]                
Cost 4,062,000 [4],[7],[16],[30] 3,640,000 [1],[8],[11],[17],[34]     4,062,000 [4],[7],[16],[30]   4,062,000 [4],[7],[16],[30]   3,640,000 [1],[8],[11],[17],[34]                
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[17],[31]   407,000             407,000                
Cost [1],[8],[11],[17],[31]   411,000             411,000                
Investment, Identifier [Axis]: Vision Solutions Inc., Business Equipment & Services, Second Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,820,000 [2],[4],[5] 4,771,000 [1],[8],[9],[12]     5,820,000 [2],[4],[5]   5,820,000 [2],[4],[5]   4,771,000 [1],[8],[9],[12]                
Cost 6,497,000 [2],[4],[5] 6,497,000 [1],[8],[9],[12]     6,497,000 [2],[4],[5]   6,497,000 [2],[4],[5]   6,497,000 [1],[8],[9],[12]                
Investment, Identifier [Axis]: VistaJet Pass Through Trust 2021-1B, Airlines, Structured Secured Note - Class B                                  
Schedule of Investments [Line Items]                                  
Fair value 3,136,000 [7] 3,792,000 [1],[11]     3,136,000 [7]   3,136,000 [7]   3,792,000 [1],[11]                
Cost 3,929,000 [7] 4,643,000 [1],[11]     3,929,000 [7]   3,929,000 [7]   4,643,000 [1],[11]                
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 7,558,000 [2],[4],[7] 7,645,000 [1],[8],[11],[12]     7,558,000 [2],[4],[7]   7,558,000 [2],[4],[7]   7,645,000 [1],[8],[11],[12]                
Cost 7,457,000 [2],[4],[7] 7,520,000 [1],[8],[11],[12]     7,457,000 [2],[4],[7]   7,457,000 [2],[4],[7]   7,520,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, Partnership Units                                  
Schedule of Investments [Line Items]                                  
Fair value 298,000 [7],[13] 293,000 [1],[11],[14]     298,000 [7],[13]   298,000 [7],[13]   293,000 [1],[11],[14]                
Cost 164,000 [7],[13] 164,000 [1],[11],[14]     164,000 [7],[13]   164,000 [7],[13]   164,000 [1],[11],[14]                
Investment, Identifier [Axis]: W2O Holdings, Inc., Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 2,622,000     0   0   2,622,000                
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[27] 5,823,000       5,823,000   5,823,000                    
Cost [7],[27] 5,907,000       5,907,000   5,907,000                    
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[12]   3,302,000             3,302,000                
Cost [1],[8],[11],[12]   3,301,000             3,301,000                
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC,Insurance, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 2,400,000       2,400,000   2,400,000                    
Cost [2],[4],[7] 2,403,000       2,403,000   2,403,000                    
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   13,937,000             13,937,000                
Cost [1],[8],[11],[15]   13,956,000             13,956,000                
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[8],[11],[15]   1,056,000             1,056,000                
Cost [1],[8],[11],[15]   1,059,000             1,059,000                
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] 14,266,000       14,266,000   14,266,000                    
Cost [2],[4],[7],[24] 13,906,000       13,906,000   13,906,000                    
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] 373,000       373,000   373,000                    
Cost [2],[4],[7],[24] 323,000       323,000   323,000                    
Investment, Identifier [Axis]: WWEC Holdings III Corp, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 3,106,000 3,106,000     3,106,000   3,106,000   3,106,000                
Investment, Identifier [Axis]: WWEC Holdings III Corp, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,112,000 1,366,000     2,112,000   2,112,000   1,366,000                
Investment, Identifier [Axis]: Waccamaw River LLC                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 2,480,000     0   0   2,480,000                
Contributed capital 30,280,000 27,800,000     30,280,000   30,280,000   27,800,000           $ 25,000,000    
Total return of capital (recallable) 5,280,000 5,280,000     5,280,000   5,280,000   5,280,000           $ 5,300,000    
Investment, Identifier [Axis]: Waccamaw River LLC, Investment Funds & Vehicles, 20% Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[17]   20,212,000             20,212,000                
Cost [1],[17]   22,520,000             22,520,000                
Investment, Identifier [Axis]: Waccamaw River LLC, Investment Funds & Vehicles, Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value [16] 18,763,000       18,763,000   18,763,000                    
Cost [16] 25,000,000       25,000,000   25,000,000                    
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest                                  
Schedule of Investments [Line Items]                                  
Fair value 18,763,000 20,212,000     18,763,000   18,763,000   20,212,000       $ 13,501,000        
Investment, Identifier [Axis]: Waccamaw River, Joint Venture                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 0 2,480,000     0   0   2,480,000                
Investment, Identifier [Axis]: Walker Edison Furniture Company LLC, Consumer Goods: Durable, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[9],[11],[14]   0             0                
Cost [1],[9],[11],[14]   3,598,000             3,598,000                
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity                                  
Schedule of Investments [Line Items]                                  
Fair value [5],[7],[13] 0       0   0                    
Cost [5],[7],[13] 0       0   0                    
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity (1.62% Partnership Interest)                                  
Schedule of Investments [Line Items]                                  
Fair value [1],[9],[11],[14]   0             0                
Cost [1],[9],[11],[14]   0             0                
Investment, Identifier [Axis]: Wawona Delaware Holdings, LLC, Beverage & Food, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 9,000 [2],[5],[6] 33,000 [1],[9],[12]     9,000 [2],[5],[6]   9,000 [2],[5],[6]   33,000 [1],[9],[12]                
Cost 41,000 [2],[5],[6] 41,000 [1],[9],[12]     41,000 [2],[5],[6]   41,000 [2],[5],[6]   41,000 [1],[9],[12]                
Investment, Identifier [Axis]: West-NR AcquisitionCo., LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,500,000 0     2,500,000   2,500,000   0                
Investment, Identifier [Axis]: Wheels Up Experience Inc, Transportation Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 11,096,000 [7] 13,153,000 [1],[11]     11,096,000 [7]   11,096,000 [7]   13,153,000 [1],[11]                
Cost 11,883,000 [7] 12,973,000 [1],[11]     11,883,000 [7]   11,883,000 [7]   12,973,000 [1],[11]                
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7] 8,337,000       8,337,000   8,337,000                    
Cost [2],[4],[7] 8,314,000       8,314,000   8,314,000                    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, LP Units                                  
Schedule of Investments [Line Items]                                  
Fair value [7],[13] 630,000       630,000   630,000                    
Cost [7],[13] 631,000       631,000   631,000                    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value [2],[4],[7],[24] (65,000)       (65,000)   (65,000)                    
Cost [2],[4],[7],[24] (68,000)       (68,000)   (68,000)                    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,886,000 0     1,886,000   1,886,000   0                
Investment, Identifier [Axis]: Wok Holdings Inc., Retail, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 45,000 [2],[4],[5] 41,000 [1],[8],[9],[12]     45,000 [2],[4],[5]   45,000 [2],[4],[5]   41,000 [1],[8],[9],[12]                
Cost 48,000 [2],[4],[5] 48,000 [1],[8],[9],[12]     48,000 [2],[4],[5]   48,000 [2],[4],[5]   48,000 [1],[8],[9],[12]                
Investment, Identifier [Axis]: Woodland Foods, Inc., Line of Credit                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,016,000 456,000     1,016,000   1,016,000   456,000                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 1,082,000 [7],[13] 1,012,000 [1],[11],[14]     1,082,000 [7],[13]   1,082,000 [7],[13]   1,012,000 [1],[11],[14]                
Cost 1,663,000 [7],[13] 1,663,000 [1],[11],[14]     1,663,000 [7],[13]   1,663,000 [7],[13]   1,663,000 [1],[11],[14]                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,007,000 [2],[4],[7] 4,882,000 [1],[8],[11],[12]     5,007,000 [2],[4],[7]   5,007,000 [2],[4],[7]   4,882,000 [1],[8],[11],[12]                
Cost 5,321,000 [2],[4],[7] 5,350,000 [1],[8],[11],[12]     5,321,000 [2],[4],[7]   5,321,000 [2],[4],[7]   5,350,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 1,062,000 [2],[4],[7],[24] 1,556,000 [1],[8],[11],[12]     1,062,000 [2],[4],[7],[24]   1,062,000 [2],[4],[7],[24]   1,556,000 [1],[8],[11],[12]                
Cost 1,193,000 [2],[4],[7],[24] 1,748,000 [1],[8],[11],[12]     1,193,000 [2],[4],[7],[24]   1,193,000 [2],[4],[7],[24]   1,748,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Fair value 8,767,000 [4],[7],[18] 8,821,000 [1],[8],[11],[26]     8,767,000 [4],[7],[18]   8,767,000 [4],[7],[18]   8,821,000 [1],[8],[11],[26]                
Cost 8,726,000 [4],[7],[18] 8,795,000 [1],[8],[11],[26]     8,726,000 [4],[7],[18]   8,726,000 [4],[7],[18]   8,795,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 2                                  
Schedule of Investments [Line Items]                                  
Fair value 2,414,000 [4],[7],[18] 2,428,000 [1],[8],[11],[26]     2,414,000 [4],[7],[18]   2,414,000 [4],[7],[18]   2,428,000 [1],[8],[11],[26]                
Cost 2,400,000 [4],[7],[18] 2,423,000 [1],[8],[11],[26]     2,400,000 [4],[7],[18]   2,400,000 [4],[7],[18]   2,423,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, CAF Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,589,000 3,109,000     2,589,000   2,589,000   3,109,000                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Common Stock                                  
Schedule of Investments [Line Items]                                  
Fair value 557,000 [7],[13],[16] 549,000 [1],[11],[14],[17]     557,000 [7],[13],[16]   557,000 [7],[13],[16]   549,000 [1],[11],[14],[17]                
Cost 565,000 [7],[13],[16] 565,000 [1],[11],[14],[17]     565,000 [7],[13],[16]   565,000 [7],[13],[16]   565,000 [1],[11],[14],[17]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,153,000 [4],[7],[16],[24],[30] 5,446,000 [1],[8],[11],[17],[31]     6,153,000 [4],[7],[16],[24],[30]   6,153,000 [4],[7],[16],[24],[30]   5,446,000 [1],[8],[11],[17],[31]                
Cost 6,233,000 [4],[7],[16],[24],[30] 5,586,000 [1],[8],[11],[17],[31]     6,233,000 [4],[7],[16],[24],[30]   6,233,000 [4],[7],[16],[24],[30]   5,586,000 [1],[8],[11],[17],[31]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Subordinated Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,095,000 [7],[16] 2,502,000 [1],[11],[17]     3,095,000 [7],[16]   3,095,000 [7],[16]   2,502,000 [1],[11],[17]                
Cost $ 3,115,000 [7],[16] $ 2,553,000 [1],[11],[17]     $ 3,115,000 [7],[16]   $ 3,115,000 [7],[16]   $ 2,553,000 [1],[11],[17]                
Investment, interest rate, paid in kind 11.00% [7],[16] 11.00% [1],[11],[17]     11.00% [7],[16]   11.00% [7],[16]   11.00% [1],[11],[17]                
Investment, Identifier [Axis]: ZB Holdco LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount $ 0 $ 1,352,000     $ 0   $ 0   $ 1,352,000                
Investment, Identifier [Axis]: ZB Holdco LLC, Delayed Draw Term Loan 1                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,932,000 0     2,932,000   2,932,000   0                
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 6,146,000 [2],[4],[7],[24] 2,628,000 [1],[8],[11],[12]     6,146,000 [2],[4],[7],[24]   6,146,000 [2],[4],[7],[24]   2,628,000 [1],[8],[11],[12]                
Cost 6,194,000 [2],[4],[7],[24] 2,623,000 [1],[8],[11],[12]     6,194,000 [2],[4],[7],[24]   6,194,000 [2],[4],[7],[24]   2,623,000 [1],[8],[11],[12]                
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, LLC Units                                  
Schedule of Investments [Line Items]                                  
Fair value 153,000 [7] 189,000 [1],[11],[14]     153,000 [7]   153,000 [7]   189,000 [1],[11],[14]                
Cost 153,000 [7] 153,000 [1],[11],[14]     153,000 [7]   153,000 [7]   153,000 [1],[11],[14]                
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 15,000 [2],[4],[7],[24] (12,000) [1],[8],[11],[12]     15,000 [2],[4],[7],[24]   15,000 [2],[4],[7],[24]   (12,000) [1],[8],[11],[12]                
Cost 21,000 [2],[4],[7],[24] (14,000) [1],[8],[11],[12]     21,000 [2],[4],[7],[24]   21,000 [2],[4],[7],[24]   (14,000) [1],[8],[11],[12]                
Investment, Identifier [Axis]: ZB Holdco LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 811,000 845,000     811,000   811,000   845,000                
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Capex / Acquisition Facility                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 2,553,000 2,516,000     2,553,000   2,553,000   2,516,000                
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Services: Business, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 5,415,000 [4],[7],[16],[24],[30] 5,162,000 [1],[8],[11],[17],[42]     5,415,000 [4],[7],[16],[24],[30]   5,415,000 [4],[7],[16],[24],[30]   5,162,000 [1],[8],[11],[17],[42]                
Cost 6,184,000 [4],[7],[16],[24],[30] 6,149,000 [1],[8],[11],[17],[42]     6,184,000 [4],[7],[16],[24],[30]   6,184,000 [4],[7],[16],[24],[30]   6,149,000 [1],[8],[11],[17],[42]                
Investment, Identifier [Axis]: eShipping, LLC, Delayed Draw Term Loan                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 869,000 1,650,000     869,000   869,000   1,650,000                
Investment, Identifier [Axis]: eShipping, LLC, Revolver                                  
Schedule of Investments [Line Items]                                  
Committed investment amount 1,486,000 1,486,000     1,486,000   1,486,000   1,486,000                
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, First Lien Senior Secured Term Loan                                  
Schedule of Investments [Line Items]                                  
Fair value 3,475,000 [4],[7],[18] 3,262,000 [1],[8],[11],[26]     3,475,000 [4],[7],[18]   3,475,000 [4],[7],[18]   3,262,000 [1],[8],[11],[26]                
Cost 3,413,000 [4],[7],[18] 3,209,000 [1],[8],[11],[26]     3,413,000 [4],[7],[18]   3,413,000 [4],[7],[18]   3,209,000 [1],[8],[11],[26]                
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, Revolver                                  
Schedule of Investments [Line Items]                                  
Fair value 0 [4],[7],[18],[24] (9,000) [1],[8],[11],[26]     0 [4],[7],[18],[24]   0 [4],[7],[18],[24]   (9,000) [1],[8],[11],[26]                
Cost $ (20,000) [4],[7],[18],[24] $ (24,000) [1],[8],[11],[26]     $ (20,000) [4],[7],[18],[24]   $ (20,000) [4],[7],[18],[24]   $ (24,000) [1],[8],[11],[26]                
[1] All of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.
[2] The interest rate on these loans is subject to 3 Month SOFR, which as of September 30, 2023 was 5.39550%.
[3] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of the portfolio company as the Company owns between 5% or more, up to 25% (inclusive), of the portfolio company’s voting securities (“non-controlled affiliate”). Transactions related to investments in non-controlled “Affiliate Investments” for the nine months ended September 30, 2023 were as follows:
December 31, 2022
Value		Gross Additions
(a)		Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)September 30, 2023
 Value		Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
1888 Industrial Services, LLC(d)
First Lien Senior Secured Term Loan (SOFR + 5.00%)(e)
$— $20 $(22)$— $2 $— $50 
Revolver (SOFR + 5.00%)(e)
1,263 — (15)— (121)1,127 99 
Warrants (7,546.76 units)
— — — — — — — 
1,263 20 (37)— (119)1,127 149 
Coastal Marina Holdings, LLC
(d)
Subordinated Term Loan (8.0% Cash)
— 15,610 — — 8 15,618 350 
Subordinated Term Loan (10.0% PIK)
— 6,521 — — 5 6,526 179 
LLC Units (2,407,825 units)
— 12,732 — — 29 12,761 — 
— 34,863 — — 42 34,905 529 
Eclipse Business Capital, LLC(d)
Revolver (SOFR + 7.25%, 12.6%, Cash)
5,273 20,924 (21,454)— (15)4,728 350 
Second Lien Senior Secured Term Loan (7.5% Cash)
4,545 4 — — (4)4,545 259 
LLC units (89,447,396 units)
135,066 354 — — 11,634 147,054 10,629 
144,884 21,282 (21,454)— 11,615 156,327 11,238 
Hylan Datacom & Electrical LLC(d)
First Lien Senior Secured Term Loan (SOFR + 8.00%, 13.1% Cash)
3,917 56 — — (56)3,917 441 
Second Lien Senior Secured Term Loan (SOFR + 10.00%, 15.3% Cash)
4,098 343 — — — 4,441 491 
Common Stock (102,144 shares)
4,496 — — — (910)3,586 — 
12,511 399 — — (966)11,944 932 
Jocassee Partners LLC
9.1% Member Interest
40,088 — — — 1,145 41,233 4,282 
40,088 — — — 1,145 41,233 4,282 
Kemmerer Operations, LLC(d)
First Lien Senior Secured Term Loan (15.0% PIK)
1,565 198 (1,051)— — 712 149 
Common Stock (6.78 shares)
1,181 — — — 1,155 2,336 — 
2,746 198 (1,051)— 1,155 3,048 149 
Rocade Holdings LLC(d)
Preferred LP Units (55,000 units) (SOFR + 6.0% PIK, 11.4% PIK)
— 58,841 — — 9 58,850 3,841 
Common LP Units (23.8 units)
— — — — 504 504 — 
— 58,841 — — 513 59,354 3,841 
Sierra Senior Loan Strategy JV I LLC
89.01% Member Interest
37,950 — — — 4,138 42,088 3,873 
37,950 — — — 4,138 42,088 3,873 
Thompson Rivers LLC
16.0% Member Interest
30,339 — (16,933)— 151 13,557 — 
30,339 — (16,933)— 151 13,557 — 
Waccamaw River LLC
20% Member Interest
20,212 2,480 — — (3,929)18,763 1,460 
20,212 2,480 — — (3,929)18,763 1,460 
Total Affiliate Investments$289,993 $118,083 $(39,475)$— $13,745 $382,346 $26,453 
(a)     Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)    Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c) Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Affiliate category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.
[4] Debt investment includes interest rate floor feature.
[5] Investment was purchased as part of the Sierra Merger and is part of the Sierra Reference Portfolio for purposes of the Sierra Credit Support Agreement.
[6] Non-accrual investment.
[7] The fair value of the investment was determined using significant unobservable inputs.
[8] Debt investment includes interest rate floor feature.
[9] Investment was purchased as part of the Sierra Merger and is part of the Sierra Reference Portfolio for purposes of the Sierra Credit Support Agreement.
[10] Non-accrual investment.
[11] The fair value of the investment was determined using significant unobservable inputs.
[12] The interest rate on these loans is subject to 3 Month LIBOR, which as of December 31, 2022 was 4.76729%.
[13] Investment is non-income producing.
[14] Investment is non-income producing.
[15] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2022 was 4.58745%.
[16] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 25.9% of total investments at fair value as of September 30, 2023. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets. If at any time qualifying assets do not represent at least 70% of the Company’s total assets, the Company will be precluded from acquiring any additional non-qualifying asset until such time as it complies with the requirements of Section 55(a).
[17] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 25.9% of total investments at fair value as of December 31, 2022. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets. If at any time qualifying assets do not represent at least 70% of the Company's total assets, the Company will be precluded from acquiring any additional non-qualifying asset until such time as it complies with the requirements of Section 55(a).
[18] The interest rate on these loans is subject to 1 Month SOFR, which as of September 30, 2023 was 5.31899%.
[19] The interest rate on these loans is subject to 3 Month EURIBOR, which as of September 30, 2023 was 3.95200%.
[20] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2022 was 2.13200%.
[21] The interest rate on these loans is subject to 1 Month BBSY, which as of September 30, 2023 was 4.05130%.
[22] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2022 was 3.01500%.
[23] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2022 was 4.35806%.
[24] Position or portion thereof is an unfunded loan or equity commitment.
[25] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2022 was 4.78131%.
[26] The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.
[27] The interest rate on these loans is subject to 6 Month SOFR, which as of September 30, 2023 was 5.46727%.
[28] The interest rate on these loans is subject to 6 Month LIBOR, which as of December 31, 2022 was 5.13886%.
[29] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2022 was 2.69300%.
[30] The interest rate on these loans is subject to 3 Month SONIA, which as of September 30, 2023 was 5.28980%.
[31] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2022 was 3.75470%.
[32] The interest rate on these loans is subject to 6 Month EURIBOR, which as of September 30, 2023 was 4.12500%.
[33] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2022 was 1.88400%.
[34] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2022 was 4.09490%.
[35] The interest rate on these loans is subject to 6 Month SONIA, which as of September 30, 2023 was 5.38530%.
[36] The interest rate on these loans is subject to 3 Month BBSY, which as of September 30, 2023 was 4.14000%.
[37] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2022 was 3.76500%.
[38] The interest rate on these loans is subject to 3 Month STIBOR, which as of September 30, 2023 was 4.06200%.
[39] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2022 was 2.70100%.
[40] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” and “control” the portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the nine months ended September 30, 2023 in which the portfolio company is deemed to be a “Control Investment” of the Company were as follows:
December 31, 2022
Value		Gross Additions
(a)		Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)September 30, 2023
Value		Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Black Angus Steakhouses, LLC(d)
First Lien Senior Secured Term Loan (SOFR + 9.00%, 14.3% Cash)
$5,647 $417 $— $— $— $6,064 $688 
First Lien Senior Secured Term Loan (10.0% PIK)(e)
9,147 — — — (3,007)6,140 — 
LLC Units (44.6 units)
— — — — — — — 
14,794 417 — — (3,007)12,204 688 
MVC Automotive Group GmbH(d)
Bridge Loan (4.5% Cash, 1.5% PIK)
7,149 2,467 — — — 9,616 439 
Common Equity Interest (18,000 Shares)
9,675 — — — 4,863 14,538 — 
16,824 2,467 — — 4,863 24,154 439 
MVC Private Equity Fund LP
General Partnership Interest
(1,831.4 units)
45 — (15)— (6)24 80 
Limited Partnership Interest
(71,790.4 units)
1,793 — (580)— (232)981 — 
1,838 — (595)— (238)1,005 80 
Security Holdings B.V(d)
Bridge Loan (5.0% PIK,)
6,020 152 — — — 6,172 230 
2023 Revolver (6.0% Cash)
— 3,293 — — (117)3,176 71 
Senior Subordinated Term Loan (3.1% PIK)
10,534 313 — — — 10,847 283 
Senior Unsecured Term Loan (6.0% Cash, 9.0% PIK)
2,015 153 — — (26)2,142 266 
Common Stock Series A (17,100 shares)
575 — — — (202)373 — 
Common Stock Series B (1,236 shares)
53,728 — — — (18,938)34,790 — 
72,872 3,911 — — (19,283)57,500 850 
Total Control Investments$106,328 $6,795 $(595)$— $(17,665)$94,863 $2,057 
(a) Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)     Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c)    Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.
[41] The interest rate on these loans is subject to 1 Month SONIA, which as of September 30, 2023 was 5.19860%.
[42] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2022 was 3.43570%.
[43] The interest rate on these loans is subject to 1 Month NIBOR, which as of September 30, 2023 was 4.49000%.
[44] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2022 was 4.93500%.
[45] All debt investments are income producing, unless otherwise noted. The Company’s external investment adviser, Barings, determines in good faith the fair value of the Company’s investments in accordance with a valuation policy and processes established by the Adviser, which have been approved by the Company’s board of directors (the “Board”), and the Investment Company Act of 1940, as amended (the “1940 Act”). In addition, all debt investments are variable rate investments unless otherwise noted. Index-based floating interest rates are generally subject to a contractual minimum interest rate. Variable rate loans to the Company’s portfolio companies bear interest at a rate that may be determined by reference to the Secured Overnight Financing Rate (“SOFR”), the Euro Interbank Offered Rate (“EURIBOR”), the Bank Bill Swap Bid Rate (“BBSY”), the Stockholm Interbank Offered Rate (“STIBOR”), the Canadian Dollar Offered Rate (“CDOR”), the Sterling Overnight Index Average (“SONIA”), the Swiss Average Rate Overnight (“SARON”), the Norwegian Interbank Offered Rate (“NIBOR”), the Bank Bill Market rate (“BKBM”) or an alternate base rate (commonly based on the Federal Funds Rate or the Prime Rate), at the borrower’s option, which reset annually, semi-annually, quarterly or monthly. For each such loan, the Company has provided the interest rate in effect on the date presented. SOFR-based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread. The borrower may also elect to have multiple interest reset periods for each loan.
[46] All of the Company’s portfolio company investments (including joint venture investments), which as of September 30, 2023 represented 210.4% of the Company’s net assets, are subject to legal restrictions on sales. The acquisition date represents the date of the Company's initial investment in the relevant portfolio company.
[47] Investment was purchased as part of the MVC Acquisition and is part of the MVC Reference Portfolio for purposes of the MVC Credit Support Agreement.
[48] The interest rate on these loans is subject to 6 Month BBSY, which as of September 30, 2023 was 4.40460%.
[49] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2022 was 3.26470%.
[50] The interest rate on these loans is subject to 1 Month EURIBOR, which as of September 30, 2023 was 3.84700%.
[51] The interest rate on these loans is subject to 3 Month BKBM, which as of September 30, 2023 was 5.68000%.
[52] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2022 was 4.53000%.
[53] The interest rate on these loans is subject to 6 Month SARON, which as of September 30, 2023 was 1.71489%.
[54] Fair value as a percentage of net assets.
[55] Investment was purchased as part of the MVC Acquisition and is part of the MVC Reference Portfolio for purposes of the MVC Credit Support Agreement.
[56] The interest rate on these loans is subject to Prime, which as of December 31, 2022 was 7.50000%.
[57] The interest rate on these loans is subject to 3 Month CDOR, which as of September 30, 2023 was 5.51250%.
[58] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2022 was 3.04000%.
[59] The interest rate on these loans is subject to 3 Month SARON, which as of December 31, 2022 was 0.94212%.
[60] The interest rate on these loans is subject to 1 Month CDOR, which as of September 30, 2023 was 5.38500%.
[61] The interest rate on these loans is subject to 1 Month CDOR, which as of December 31, 2022 was 4.73750%.