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INVESTMENTS - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
investment
loan
Dec. 31, 2022
USD ($)
investment
loan
Feb. 25, 2022
member
Apr. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
investment
loan
Mar. 31, 2023
Jun. 30, 2022
USD ($)
investment
Jun. 30, 2023
USD ($)
investment
loan
Jun. 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         4   26 15 48                  
Purchases of portfolio investments         $ 11,700,000   $ 248,700,000 $ 81,400,000 $ 495,200,000                  
Committed investment amount $ 338,322,000 $ 308,532,000     338,322,000     338,322,000   $ 308,532,000                
Operating dividend income         10,250,000   7,246,000 18,124,000 $ 14,939,000                  
Fair value 2,505,992,000 [1] 2,448,935,000 [2]     2,505,992,000 [1]     2,505,992,000 [1]   2,448,935,000 [2]                
Cost 2,554,705,000 [1] 2,562,398,000 [2]     2,554,705,000 [1]     2,554,705,000 [1]   2,562,398,000 [2]                
Borrowings under credit facilities $ 772,087,000 $ 729,144,000     $ 772,087,000     $ 772,087,000   $ 729,144,000                
Number of members | member     2                              
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 6 7     6     6   7                
Number of portfolio companies, initiated by the company | investment 1 1     1     1   1                
Single Portfolio Company | Percentage of Total Portfolio, at Fair Value | Portfolio Company Investment Risk                                    
Schedule of Investments [Line Items]                                    
Concentration risk, percent 6.10% 5.90%                                
Fair Value, Inputs, Level 3                                    
Schedule of Investments [Line Items]                                    
Unrealized gain (loss)               $ 16,000,000 $ 11,000,000                  
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               922,400,000   $ 875,900,000                
Gain (loss) on sale of investments         $ 100,000   (200,000) 100,000 (200,000)                  
Due from related parties $ 26,900,000 $ 18,200,000     26,900,000     26,900,000   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 772,087,000 729,144,000     772,087,000     772,087,000   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 176,700,000 174,300,000     176,700,000     176,700,000   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 361,100,000 357,900,000     361,100,000     361,100,000   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         41,000,000   69,400,000 98,000,000 89,400,000                  
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         3,700,000   2,400,000 7,300,000 3,900,000                  
Waccamaw River, LLC | JPMorgan Chase Bank N.A. Non-Recourse Loan | Secured Debt                                    
Schedule of Investments [Line Items]                                    
Long-term debt, gross 83,600,000 72,300,000     83,600,000     83,600,000   72,300,000                
Waccamaw River, LLC | Barclay Bank PLC Non-Recourse Loan | Secured Debt                                    
Schedule of Investments [Line Items]                                    
Long-term debt, gross 76,200,000 44,800,000     76,200,000     76,200,000   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 77,000,000 75,000,000     77,000,000     77,000,000   75,000,000                
Jocassee Partners LLC                                    
Schedule of Investments [Line Items]                                    
Committed investment amount                         $ 50,000,000         $ 50,000,000
Dividends         15,700,000     31,400,000                    
Operating dividend income         1,400,000     2,900,000                    
Fair value 1,246,150,000 1,209,063,000     1,246,150,000     $ 1,246,150,000   $ 1,209,063,000                
Interest-earning assets, average yield               9.70%   8.60%                
Thompson Rivers LLC                                    
Schedule of Investments [Line Items]                                    
Operating dividend income         0   2,300,000 $ 0 5,500,000                  
Fair value 522,174,000 890,911,000     522,174,000     522,174,000   $ 890,911,000                
Cost $ 554,829,000 $ 949,279,000     554,829,000     554,829,000   $ 949,279,000                
Distributions of realized gains         $ 6,600,000   8,800,000 $ 15,700,000 8,800,000                  
Investment owned, outstanding loans | loan 3,262 5,414     3,262     3,262   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 132,700,000 224,200,000     132,700,000     132,700,000   224,200,000                
Thompson Rivers LLC | Bank of America N.A.,                                    
Schedule of Investments [Line Items]                                    
Repurchase agreement counterparty, amount at risk 246,200,000 428,000,000     246,200,000     246,200,000   428,000,000                
Thompson Rivers LLC | Barclays Bank                                    
Schedule of Investments [Line Items]                                    
Repurchase agreement counterparty, amount at risk $ 100,200,000 $ 184,200,000     100,200,000     100,200,000   $ 184,200,000                
Waccamaw River, LLC                                    
Schedule of Investments [Line Items]                                    
Operating dividend income         $ 700,000   500,000 $ 1,500,000 800,000                  
Investment owned, outstanding loans | loan 23,182,000 18,335     23,182,000     23,182,000   18,335                
Investment company, remaining average life to maturity           44 months   43 months                    
Average loan amount $ 10,990 $ 11,542     $ 10,990     $ 10,990   $ 11,542                
Investment company, weighted average interest rate               12.50%   12.00%                
Sierra JV                                    
Schedule of Investments [Line Items]                                    
Dividends         1,500,000   31,800,000 $ 2,900,000 31,800,000                  
Operating dividend income         1,300,000   1,600,000 2,500,000 1,600,000                  
Fair value 106,927,000 110,047,000     106,927,000     106,927,000   $ 110,047,000                
Cost $ 115,684,000 $ 125,220,000     $ 115,684,000     $ 115,684,000   $ 125,220,000                
Dividends, return of capital             26,700,000   26,700,000                  
Weighted average yield 9.90% 9.20%     9.90%     9.90%   9.20%                
Rocade Holdings LLC                                    
Schedule of Investments [Line Items]                                    
Fair value                     $ 45,000,000              
Payments to acquire investments       $ 10,000,000                            
Equity Co-Investments                                    
Schedule of Investments [Line Items]                                    
Purchases of portfolio investments         $ 10,000,000     $ 55,000,000                    
Investment in joint ventures                                    
Schedule of Investments [Line Items]                                    
Purchases of portfolio investments               71,600,000 173,500,000                  
Investment in joint ventures | Jocassee Partners LLC                                    
Schedule of Investments [Line Items]                                    
Fair value $ 40,834,000 $ 61,028,000     40,834,000     40,834,000   $ 61,028,000                
Cost 57,358,000 75,941,000     57,358,000     57,358,000   75,941,000                
Additional Investments in Joint Ventures                                    
Schedule of Investments [Line Items]                                    
Purchases of portfolio investments         2,500,000   2,100,000 2,500,000 13,800,000                  
Portfolio Investments                                    
Schedule of Investments [Line Items]                                    
Purchases of portfolio investments               255,744,000 708,703,000                  
Repayments received/sales of portfolio investments               188,422,000 603,169,000                  
Portfolio Investments | Jocassee Partners LLC                                    
Schedule of Investments [Line Items]                                    
Fair value 1,254,494,000 1,219,889,000     1,254,494,000     1,254,494,000   1,219,889,000                
Cost 1,306,267,000 1,296,355,000     1,306,267,000     1,306,267,000   1,296,355,000                
Ginnie Mae Early Buyout Loans | Thompson Rivers LLC                                    
Schedule of Investments [Line Items]                                    
Fair value 522,200,000 890,900,000     522,200,000     522,200,000   890,900,000                
Cash and Cash Equivalents | Thompson Rivers LLC                                    
Schedule of Investments [Line Items]                                    
Fair value 20,400,000 65,100,000     20,400,000     20,400,000   65,100,000                
Cash and Cash Equivalents | Waccamaw River, LLC                                    
Schedule of Investments [Line Items]                                    
Fair value 14,700,000 8,000,000     14,700,000     14,700,000   8,000,000                
Consumer Loan | Waccamaw River, LLC                                    
Schedule of Investments [Line Items]                                    
Fair value 234,800,000 $ 200,500,000     234,800,000     234,800,000   $ 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               160,500,000 1,076,700,000                  
Investment with Previous Commitment to Provide Financing                                    
Schedule of Investments [Line Items]                                    
Purchases of portfolio investments               $ 50,000,000                    
Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing                                    
Schedule of Investments [Line Items]                                    
Purchases of portfolio investments                 62,000,000                  
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 11 11     11     11   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 63 58     63     63   58                
Investment Denominated in British Pounds Sterling                                    
Schedule of Investments [Line Items]                                    
Number of investments | investment 28 28     28     28   28                
Sierra Merger                                    
Schedule of Investments [Line Items]                                    
Purchases of portfolio investments         $ 41,600,000   $ 101,500,000   $ 442,200,000                  
Sierra Acquisition                                    
Schedule of Investments [Line Items]                                    
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 [1],[3],[4],[5],[6],[7] $ 0 [2],[8],[9],[10],[11],[12]     $ 0 [1],[3],[4],[5],[6],[7]     $ 0 [1],[3],[4],[5],[6],[7]   $ 0 [2],[8],[9],[10],[11],[12]                
Cost 419,000 [1],[3],[4],[5],[6],[7] 419,000 [2],[8],[9],[10],[11],[12]     419,000 [1],[3],[4],[5],[6],[7]     419,000 [1],[3],[4],[5],[6],[7]   419,000 [2],[8],[9],[10],[11],[12]                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 1,141,000 [1],[3],[4],[5],[6],[7] 1,263,000 [2],[8],[9],[10],[11],[12]     1,141,000 [1],[3],[4],[5],[6],[7]     1,141,000 [1],[3],[4],[5],[6],[7]   1,263,000 [2],[8],[9],[10],[11],[12]                
Cost 1,498,000 [1],[3],[4],[5],[6],[7] 1,498,000 [2],[8],[9],[10],[11],[12]     1,498,000 [1],[3],[4],[5],[6],[7]     1,498,000 [1],[3],[4],[5],[6],[7]   1,498,000 [2],[8],[9],[10],[11],[12]                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, Warrants                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11],[14]                
Cost 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[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]                                    
Fair value 1,141,000 1,263,000     1,141,000     1,141,000   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 16,183,000 [1],[3],[5],[15] 16,307,000 [2],[8],[11],[16]     16,183,000 [1],[3],[5],[15]     16,183,000 [1],[3],[5],[15]   16,307,000 [2],[8],[11],[16]                
Cost 16,035,000 [1],[3],[5],[15] 16,124,000 [2],[8],[11],[16]     16,035,000 [1],[3],[5],[15]     16,035,000 [1],[3],[5],[15]   16,124,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: A.T. Holdings II LTD, Other Financial, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 12,050,000 [1],[5],[17] 12,500,000 [2],[11],[18]     12,050,000 [1],[5],[17]     12,050,000 [1],[5],[17]   12,500,000 [2],[11],[18]                
Cost 12,500,000 [1],[5],[17] 12,500,000 [2],[11],[18]     12,500,000 [1],[5],[17]     12,500,000 [1],[5],[17]   12,500,000 [2],[11],[18]                
Investment, Identifier [Axis]: ADB Safegate, Aerospace & Defense, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,882,000 [1],[3],[5],[15],[17] 4,180,000 [2],[8],[11],[12],[18]     4,882,000 [1],[3],[5],[15],[17]     4,882,000 [1],[3],[5],[15],[17]   4,180,000 [2],[8],[11],[12],[18]                
Cost 5,633,000 [1],[3],[5],[15],[17] 5,184,000 [2],[8],[11],[12],[18]     5,633,000 [1],[3],[5],[15],[17]     5,633,000 [1],[3],[5],[15],[17]   5,184,000 [2],[8],[11],[12],[18]                
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 562,000 [1],[5],[13] 798,000 [2],[11],[14]     562,000 [1],[5],[13]     562,000 [1],[5],[13]   798,000 [2],[11],[14]                
Cost 349,000 [1],[5],[13] 349,000 [2],[11],[14]     349,000 [1],[5],[13]     349,000 [1],[5],[13]   349,000 [2],[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 6,228,000 [1],[3],[5],[19] 6,215,000 [2],[8],[11],[12]     6,228,000 [1],[3],[5],[19]     6,228,000 [1],[3],[5],[19]   6,215,000 [2],[8],[11],[12]                
Cost 6,347,000 [1],[3],[5],[19] 6,339,000 [2],[8],[11],[12]     6,347,000 [1],[3],[5],[19]     6,347,000 [1],[3],[5],[19]   6,339,000 [2],[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 [2],[9],[18]   3,190,000               3,190,000                
Cost [2],[9],[18]   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 [2],[9],[18]   1,423,000               1,423,000                
Cost [2],[9],[18]   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 [1],[4],[17] 2,719,000       2,719,000     2,719,000                    
Cost [1],[4],[17] 4,275,000       4,275,000     4,275,000                    
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes 2                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[4],[17] 1,258,000       1,258,000     1,258,000                    
Cost [1],[4],[17] 1,786,000       1,786,000     1,786,000                    
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 2,462,000 [1],[3],[5],[17],[20] 2,044,000 [2],[8],[11],[18],[21]     2,462,000 [1],[3],[5],[17],[20]     2,462,000 [1],[3],[5],[17],[20]   2,044,000 [2],[8],[11],[18],[21]                
Cost 2,308,000 [1],[3],[5],[17],[20] 1,952,000 [2],[8],[11],[18],[21]     2,308,000 [1],[3],[5],[17],[20]     2,308,000 [1],[3],[5],[17],[20]   1,952,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: APOG Bidco Pty Ltd, Healthcare, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,008,000 [1],[3],[5],[17],[22] 2,073,000 [2],[8],[11],[18],[23]     2,008,000 [1],[3],[5],[17],[22]     2,008,000 [1],[3],[5],[17],[22]   2,073,000 [2],[8],[11],[18],[23]                
Cost 2,282,000 [1],[3],[5],[17],[22] 2,279,000 [2],[8],[11],[18],[23]     2,282,000 [1],[3],[5],[17],[22]     2,282,000 [1],[3],[5],[17],[22]   2,279,000 [2],[8],[11],[18],[23]                
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 [1],[3],[5],[6] 19,140,000 [2],[8],[11],[12]     19,660,000 [1],[3],[5],[6]     19,660,000 [1],[3],[5],[6]   19,140,000 [2],[8],[11],[12]                
Cost 19,592,000 [1],[3],[5],[6] 19,564,000 [2],[8],[11],[12]     19,592,000 [1],[3],[5],[6]     19,592,000 [1],[3],[5],[6]   19,564,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Class A Units                                    
Schedule of Investments [Line Items]                                    
Fair value 665,000 [1],[5] 620,000 [2],[11],[14]     665,000 [1],[5]     665,000 [1],[5]   620,000 [2],[11],[14]                
Cost 539,000 [1],[5] 539,000 [2],[11],[14]     539,000 [1],[5]     539,000 [1],[5]   539,000 [2],[11],[14]                
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 13,968,000 [1],[3],[5],[24] 20,920,000 [2],[8],[11],[25]     13,968,000 [1],[3],[5],[24]     13,968,000 [1],[3],[5],[24]   20,920,000 [2],[8],[11],[25]                
Cost 13,933,000 [1],[3],[5],[24] 20,920,000 [2],[8],[11],[25]     13,933,000 [1],[3],[5],[24]     13,933,000 [1],[3],[5],[24]   20,920,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] (12,000)       (12,000)     (12,000)                    
Cost [1],[3],[5],[15] (14,000)       (14,000)     (14,000)                    
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 [2],[8],[11],[12]   8,367,000               8,367,000                
Cost [2],[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 8,259,000 [1],[3],[5],[15] 8,125,000 [2],[8],[11],[26]     8,259,000 [1],[3],[5],[15]     8,259,000 [1],[3],[5],[15]   8,125,000 [2],[8],[11],[26]                
Cost 8,100,000 [1],[3],[5],[15] 8,129,000 [2],[8],[11],[26]     8,100,000 [1],[3],[5],[15]     8,100,000 [1],[3],[5],[15]   8,129,000 [2],[8],[11],[26]                
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (7,000) [1],[3],[5],[15] (42,000) [2],[8],[11],[26]     (7,000) [1],[3],[5],[15]     (7,000) [1],[3],[5],[15]   (42,000) [2],[8],[11],[26]                
Cost (38,000) [1],[3],[5],[15] (41,000) [2],[8],[11],[26]     (38,000) [1],[3],[5],[15]     (38,000) [1],[3],[5],[15]   (41,000) [2],[8],[11],[26]                
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 4,686,000 [1],[3] 4,416,000 [2],[8],[27]     4,686,000 [1],[3]     4,686,000 [1],[3]   4,416,000 [2],[8],[27]                
Cost $ 4,557,000 [1],[3] $ 4,505,000 [2],[8],[27]     $ 4,557,000 [1],[3]     $ 4,557,000 [1],[3]   $ 4,505,000 [2],[8],[27]                
Investment, interest rate, paid in kind 0.30% [1],[3] 0.30% [2],[8],[27]     0.30% [1],[3]     0.30% [1],[3]   0.30% [2],[8],[27]                
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value $ 739,000 [1],[3],[19] $ 685,000 [2],[8],[27]     $ 739,000 [1],[3],[19]     $ 739,000 [1],[3],[19]   $ 685,000 [2],[8],[27]                
Cost $ 709,000 [1],[3],[19] $ 700,000 [2],[8],[27]     $ 709,000 [1],[3],[19]     $ 709,000 [1],[3],[19]   $ 700,000 [2],[8],[27]                
Investment, interest rate, paid in kind 1.00% [1],[3],[19] 1.00% [2],[8],[27]     1.00% [1],[3],[19]     1.00% [1],[3],[19]   1.00% [2],[8],[27]                
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 3                                    
Schedule of Investments [Line Items]                                    
Fair value $ 6,167,000 [1] $ 5,919,000 [2]     $ 6,167,000 [1]     $ 6,167,000 [1]   $ 5,919,000 [2]                
Cost $ 5,856,000 [1] $ 5,703,000 [2]     $ 5,856,000 [1]     $ 5,856,000 [1]   $ 5,703,000 [2]                
Investment, interest rate, paid in kind 10.00% [1] 10.00% [2]     10.00% [1]     10.00% [1]   10.00% [2]                
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class A Convertible Preferred Equity                                    
Schedule of Investments [Line Items]                                    
Fair value $ 5,631,000 [1],[5],[13] $ 5,403,000 [2],[11],[14]     $ 5,631,000 [1],[5],[13]     $ 5,631,000 [1],[5],[13]   $ 5,403,000 [2],[11],[14]                
Cost 5,000,000 [1],[5],[13] 5,000,000 [2],[11],[14]     5,000,000 [1],[5],[13]     5,000,000 [1],[5],[13]   5,000,000 [2],[11],[14]                
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class B Convertible Preferred Equity                                    
Schedule of Investments [Line Items]                                    
Fair value 1,803,000 [1],[5],[13] 1,667,000 [2],[11],[14]     1,803,000 [1],[5],[13]     1,803,000 [1],[5],[13]   1,667,000 [2],[11],[14]                
Cost 1,667,000 [1],[5],[13] 1,667,000 [2],[11],[14]     1,667,000 [1],[5],[13]     1,667,000 [1],[5],[13]   1,667,000 [2],[11],[14]                
Investment, Identifier [Axis]: Accelerate Learning, Inc., Education Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[12]   7,480,000               7,480,000                
Cost [2],[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 2,448,000 [1],[3],[5],[17],[28] 2,436,000 [2],[8],[11],[18],[29]     2,448,000 [1],[3],[5],[17],[28]     2,448,000 [1],[3],[5],[17],[28]   2,436,000 [2],[8],[11],[18],[29]                
Cost 2,452,000 [1],[3],[5],[17],[28] 2,447,000 [2],[8],[11],[18],[29]     2,452,000 [1],[3],[5],[17],[28]     2,452,000 [1],[3],[5],[17],[28]   2,447,000 [2],[8],[11],[18],[29]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 432,000 [1],[5],[13] 436,000 [2],[11],[14]     432,000 [1],[5],[13]     432,000 [1],[5],[13]   436,000 [2],[11],[14]                
Cost 438,000 [1],[5],[13] 438,000 [2],[11],[14]     438,000 [1],[5],[13]     438,000 [1],[5],[13]   438,000 [2],[11],[14]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 11,803,000 [1],[3],[5],[6] 12,069,000 [2],[8],[11],[12]     11,803,000 [1],[3],[5],[6]     11,803,000 [1],[3],[5],[6]   12,069,000 [2],[8],[11],[12]                
Cost 12,041,000 [1],[3],[5],[6] 12,099,000 [2],[8],[11],[12]     12,041,000 [1],[3],[5],[6]     12,041,000 [1],[3],[5],[6]   12,099,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 1,597,000 [1],[3],[5],[6] 1,116,000 [2],[8],[11],[12]     1,597,000 [1],[3],[5],[6]     1,597,000 [1],[3],[5],[6]   1,116,000 [2],[8],[11],[12]                
Cost 1,643,000 [1],[3],[5],[6] 1,122,000 [2],[8],[11],[12]     1,643,000 [1],[3],[5],[6]     1,643,000 [1],[3],[5],[6]   1,122,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 634,000 1,152,000     634,000     634,000   1,152,000                
Investment, Identifier [Axis]: Acogroup, Business Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 7,281,000 [3],[5],[17],[30] 7,276,000 [2],[8],[11],[18],[31]     7,281,000 [3],[5],[17],[30]     7,281,000 [3],[5],[17],[30]   7,276,000 [2],[8],[11],[18],[31]                
Cost 7,801,000 [3],[5],[17],[30] 7,782,000 [2],[8],[11],[18],[31]     7,801,000 [3],[5],[17],[30]     7,801,000 [3],[5],[17],[30]   7,782,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Adhefin International, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 808,000 0     808,000     808,000   0                
Investment, Identifier [Axis]: Adhefin International, Industrial Other, First Lien Senior Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[20] 1,348,000       1,348,000     1,348,000                    
Cost [1],[3],[5],[17],[20] 1,357,000       1,357,000     1,357,000                    
Investment, Identifier [Axis]: Adhefin International, Industrial Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[20] 294,000       294,000     294,000                    
Cost [1],[3],[5],[17],[20] 296,000       296,000     296,000                    
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A1 Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 782,000 [1],[5],[13] 671,000 [2],[11],[14]     782,000 [1],[5],[13]     782,000 [1],[5],[13]   671,000 [2],[11],[14]                
Cost 280,000 [1],[5],[13] 280,000 [2],[11],[14]     280,000 [1],[5],[13]     280,000 [1],[5],[13]   280,000 [2],[11],[14]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A2 Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 202,000 [1],[5],[13] 173,000 [2],[11],[14]     202,000 [1],[5],[13]     202,000 [1],[5],[13]   173,000 [2],[11],[14]                
Cost 72,000 [1],[5],[13] 72,000 [2],[11],[14]     72,000 [1],[5],[13]     72,000 [1],[5],[13]   72,000 [2],[11],[14]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B1 Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 0 [2],[11],[14]     [1],[5],[13]     [1],[5],[13]   0 [2],[11],[14]                
Cost 9,000 [1],[5],[13] 9,000 [2],[11],[14]     9,000 [1],[5],[13]     9,000 [1],[5],[13]   9,000 [2],[11],[14]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B2 Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 0 [2],[11],[14]     [1],[5],[13]     [1],[5],[13]   0 [2],[11],[14]                
Cost 2,000 [1],[5],[13] 2,000 [2],[11],[14]     2,000 [1],[5],[13]     2,000 [1],[5],[13]   2,000 [2],[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 4,224,000 [1] 4,816,000 [2]     4,224,000 [1]     4,224,000 [1]   4,816,000 [2]                
Cost 4,176,000 [1] 4,841,000 [2]     4,176,000 [1]     4,176,000 [1]   4,841,000 [2]                
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 11,905,000 [1],[3],[5],[15] 12,722,000 [2],[8],[11],[12]     11,905,000 [1],[3],[5],[15]     11,905,000 [1],[3],[5],[15]   12,722,000 [2],[8],[11],[12]                
Cost 12,583,000 [1],[3],[5],[15] 12,671,000 [2],[8],[11],[12]     12,583,000 [1],[3],[5],[15]     12,583,000 [1],[3],[5],[15]   12,671,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,871,000 0     1,871,000     1,871,000   0                
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Insurance, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[20] 3,120,000       3,120,000     3,120,000                    
Cost [1],[3],[5],[17],[20] 3,061,000       3,061,000     3,061,000                    
Investment, Identifier [Axis]: Alpine SG, LLC, High Tech Industries, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 22,677,000 [1],[3],[4],[5],[15] 22,677,000 [2],[8],[9],[11],[25]     22,677,000 [1],[3],[4],[5],[15]     22,677,000 [1],[3],[4],[5],[15]   22,677,000 [2],[8],[9],[11],[25]                
Cost 22,678,000 [1],[3],[4],[5],[15] 22,678,000 [2],[8],[9],[11],[25]     22,678,000 [1],[3],[4],[5],[15]     22,678,000 [1],[3],[4],[5],[15]   22,678,000 [2],[8],[9],[11],[25]                
Investment, Identifier [Axis]: Alpine US Bidco LLC, Agricultural Products, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 16,795,000 [1],[3],[19] 16,704,000 [2],[8],[27]     16,795,000 [1],[3],[19]     16,795,000 [1],[3],[19]   16,704,000 [2],[8],[27]                
Cost 17,719,000 [1],[3],[19] 17,692,000 [2],[8],[27]     17,719,000 [1],[3],[19]     17,719,000 [1],[3],[19]   17,692,000 [2],[8],[27]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Class B Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 1,184,000 [1],[5],[13],[17] 1,121,000 [2],[11],[14],[18]     1,184,000 [1],[5],[13],[17]     1,184,000 [1],[5],[13],[17]   1,121,000 [2],[11],[14],[18]                
Cost 1,040,000 [1],[5],[13],[17] 1,040,000 [2],[11],[14],[18]     1,040,000 [1],[5],[13],[17]     1,040,000 [1],[5],[13],[17]   1,040,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Subordinated Loan Notes                                    
Schedule of Investments [Line Items]                                    
Fair value 4,690,000 [1],[5],[17] 4,303,000 [2],[11],[12],[18]     4,690,000 [1],[5],[17]     4,690,000 [1],[5],[17]   4,303,000 [2],[11],[12],[18]                
Cost $ 4,676,000 [1],[5],[17] $ 4,451,000 [2],[11],[12],[18]     $ 4,676,000 [1],[5],[17]     $ 4,676,000 [1],[5],[17]   $ 4,451,000 [2],[11],[12],[18]                
Investment, interest rate, paid in kind 9.00% [1],[5],[17] 9.00% [2],[11],[12],[18]     9.00% [1],[5],[17]     9.00% [1],[5],[17]   9.00% [2],[11],[12],[18]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrant                                    
Schedule of Investments [Line Items]                                    
Fair value $ 599,000 [1],[5],[13],[17] $ 426,000 [2],[11],[14],[18]     $ 599,000 [1],[5],[13],[17]     $ 599,000 [1],[5],[13],[17]   $ 426,000 [2],[11],[14],[18]                
Cost 4,000 [1],[5],[13],[17] 4,000 [2],[11],[14],[18]     4,000 [1],[5],[13],[17]     4,000 [1],[5],[13],[17]   4,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 471,000 0     471,000     471,000   0                
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 88,000       88,000     88,000                    
Cost [1],[5],[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 [1],[3],[5],[24] 1,896,000       1,896,000     1,896,000                    
Cost [1],[3],[5],[24] 1,897,000       1,897,000     1,897,000                    
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[24] (12,000)       (12,000)     (12,000)                    
Cost [1],[3],[5],[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 682,000 545,000     682,000     682,000   545,000                
Investment, Identifier [Axis]: Amtech LLC, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,986,000 [1],[3],[5],[19] 2,222,000 [2],[8],[11],[27]     2,986,000 [1],[3],[5],[19]     2,986,000 [1],[3],[5],[19]   2,222,000 [2],[8],[11],[27]                
Cost 2,964,000 [1],[3],[5],[19] 2,205,000 [2],[8],[11],[27]     2,964,000 [1],[3],[5],[19]     2,964,000 [1],[3],[5],[19]   2,205,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Amtech LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (6,000) [1],[3],[5],[19] 128,000 [2],[8],[11],[27]     (6,000) [1],[3],[5],[19]     (6,000) [1],[3],[5],[19]   128,000 [2],[8],[11],[27]                
Cost (10,000) [1],[3],[5],[19] 125,000 [2],[8],[11],[27]     (10,000) [1],[3],[5],[19]     (10,000) [1],[3],[5],[19]   125,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Anagram Holdings, LLC, Chemicals, Plastics, & Rubber, First Lien Senior Secured Note                                    
Schedule of Investments [Line Items]                                    
Fair value 14,995,000 [1] 14,368,000 [2]     14,995,000 [1]     14,995,000 [1]   14,368,000 [2]                
Cost $ 14,963,000 [1] $ 14,392,000 [2]     $ 14,963,000 [1]     $ 14,963,000 [1]   $ 14,392,000 [2]                
Investment, interest rate, paid in kind 5.00% [1] 5.00% [2]     5.00% [1]     5.00% [1]   5.00% [2]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Bridge Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount $ 375,000 $ 366,000     $ 375,000     $ 375,000   $ 366,000                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,121,000 [1],[3],[5],[17],[20] 2,330,000 [2],[8],[11],[18],[21]     3,121,000 [1],[3],[5],[17],[20]     3,121,000 [1],[3],[5],[17],[20]   2,330,000 [2],[8],[11],[18],[21]                
Cost 3,176,000 [1],[3],[5],[17],[20] 2,382,000 [2],[8],[11],[18],[21]     3,176,000 [1],[3],[5],[17],[20]     3,176,000 [1],[3],[5],[17],[20]   2,382,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 5,749,000 [1],[3],[5],[17],[20] 723,000 [2],[8],[11],[18],[21]     5,749,000 [1],[3],[5],[17],[20]     5,749,000 [1],[3],[5],[17],[20]   723,000 [2],[8],[11],[18],[21]                
Cost 5,755,000 [1],[3],[5],[17],[20] 790,000 [2],[8],[11],[18],[21]     5,755,000 [1],[3],[5],[17],[20]     5,755,000 [1],[3],[5],[17],[20]   790,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 1,664,000 [1],[3],[5],[17],[20] 5,623,000 [2],[8],[11],[18],[21]     1,664,000 [1],[3],[5],[17],[20]     1,664,000 [1],[3],[5],[17],[20]   5,623,000 [2],[8],[11],[18],[21]                
Cost 1,581,000 [1],[3],[5],[17],[20] 5,745,000 [2],[8],[11],[18],[21]     1,581,000 [1],[3],[5],[17],[20]     1,581,000 [1],[3],[5],[17],[20]   5,745,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 3                                    
Schedule of Investments [Line Items]                                    
Fair value 997,000 [1],[3],[5],[6],[17] 997,000 [2],[8],[11],[12],[18]     997,000 [1],[3],[5],[6],[17]     997,000 [1],[3],[5],[6],[17]   997,000 [2],[8],[11],[12],[18]                
Cost 1,019,000 [1],[3],[5],[6],[17] 1,019,000 [2],[8],[11],[12],[18]     1,019,000 [1],[3],[5],[6],[17]     1,019,000 [1],[3],[5],[6],[17]   1,019,000 [2],[8],[11],[12],[18]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (8,000) [1],[3],[5],[17],[20] (8,000) [2],[8],[11],[18],[21]     (8,000) [1],[3],[5],[17],[20]     (8,000) [1],[3],[5],[17],[20]   (8,000) [2],[8],[11],[18],[21]                
Cost (2,000) [1],[3],[5],[17],[20] (5,000) [2],[8],[11],[18],[21]     (2,000) [1],[3],[5],[17],[20]     (2,000) [1],[3],[5],[17],[20]   (5,000) [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Anju Software, Inc., Application Software, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 10,802,000 [1],[3],[5],[19] 11,006,000 [2],[8],[11],[27]     10,802,000 [1],[3],[5],[19]     10,802,000 [1],[3],[5],[19]   11,006,000 [2],[8],[11],[27]                
Cost 13,227,000 [1],[3],[5],[19] 13,269,000 [2],[8],[11],[27]     13,227,000 [1],[3],[5],[19]     13,227,000 [1],[3],[5],[19]   13,269,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,853,000 [1],[3],[5],[17],[32] 1,753,000 [2],[8],[11],[18],[33]     1,853,000 [1],[3],[5],[17],[32]     1,853,000 [1],[3],[5],[17],[32]   1,753,000 [2],[8],[11],[18],[33]                
Cost 1,880,000 [1],[3],[5],[17],[32] 1,876,000 [2],[8],[11],[18],[33]     1,880,000 [1],[3],[5],[17],[32]     1,880,000 [1],[3],[5],[17],[32]   1,876,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, Subordinated Senior Unsecured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 280,000 [1],[5],[17] 266,000 [2],[11],[18]     280,000 [1],[5],[17]     280,000 [1],[5],[17]   266,000 [2],[11],[18]                
Cost $ 297,000 [1],[5],[17] $ 285,000 [2],[11],[18]     $ 297,000 [1],[5],[17]     $ 297,000 [1],[5],[17]   $ 285,000 [2],[11],[18]                
Investment, interest rate, paid in kind 8.00% [1],[5],[17] 8.00% [2],[11],[18]     8.00% [1],[5],[17]     8.00% [1],[5],[17]   8.00% [2],[11],[18]                
Investment, Identifier [Axis]: Apidos CLO XXIV, Series 2016-24A, Multi-Sector Holdings, Subordinated Structured Notes                                    
Schedule of Investments [Line Items]                                    
Fair value $ 5,393,000 [1],[4],[17] $ 6,635,000 [2],[9],[18]     $ 5,393,000 [1],[4],[17]     $ 5,393,000 [1],[4],[17]   $ 6,635,000 [2],[9],[18]                
Cost 6,393,000 [1],[4],[17] 6,934,000 [2],[9],[18]     6,393,000 [1],[4],[17]     6,393,000 [1],[4],[17]   6,934,000 [2],[9],[18]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13],[17] 6,000 [2],[11],[14],[18]     [1],[5],[13],[17]     [1],[5],[13],[17]   6,000 [2],[11],[14],[18]                
Cost 12,000 [1],[5],[13],[17] 12,000 [2],[11],[14],[18]     12,000 [1],[5],[13],[17]     12,000 [1],[5],[13],[17]   12,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,004,000 [1],[3],[5],[17],[30] 5,085,000 [2],[8],[11],[18],[34]     2,004,000 [1],[3],[5],[17],[30]     2,004,000 [1],[3],[5],[17],[30]   5,085,000 [2],[8],[11],[18],[34]                
Cost 2,609,000 [1],[3],[5],[17],[30] 5,466,000 [2],[8],[11],[18],[34]     2,609,000 [1],[3],[5],[17],[30]     2,609,000 [1],[3],[5],[17],[30]   5,466,000 [2],[8],[11],[18],[34]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 4,000 [1],[5],[13],[17] 110,000 [2],[11],[14],[18]     4,000 [1],[5],[13],[17]     4,000 [1],[5],[13],[17]   110,000 [2],[11],[14],[18]                
Cost 120,000 [1],[5],[13],[17] 120,000 [2],[11],[14],[18]     120,000 [1],[5],[13],[17]     120,000 [1],[5],[13],[17]   120,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Apus Bidco Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,563,000 [1],[3],[5],[17],[35] 3,344,000 [2],[8],[11],[18],[36]     3,563,000 [1],[3],[5],[17],[35]     3,563,000 [1],[3],[5],[17],[35]   3,344,000 [2],[8],[11],[18],[36]                
Cost 3,892,000 [1],[3],[5],[17],[35] 3,886,000 [2],[8],[11],[18],[36]     3,892,000 [1],[3],[5],[17],[35]     3,892,000 [1],[3],[5],[17],[35]   3,886,000 [2],[8],[11],[18],[36]                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Capex / Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 2,215,000 2,543,000     2,215,000     2,215,000   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 6,064,000 [1],[3],[5],[17],[35] 5,263,000 [2],[8],[11],[18],[36]     6,064,000 [1],[3],[5],[17],[35]     6,064,000 [1],[3],[5],[17],[35]   5,263,000 [2],[8],[11],[18],[36]                
Cost 6,464,000 [1],[3],[5],[17],[35] 5,806,000 [2],[8],[11],[18],[36]     6,464,000 [1],[3],[5],[17],[35]     6,464,000 [1],[3],[5],[17],[35]   5,806,000 [2],[8],[11],[18],[36]                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[18],[36]   198,000               198,000                
Cost [2],[8],[11],[18],[36]   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 1,621,000 [1],[3],[5],[17],[35] 1,475,000 [2],[8],[11],[18],[36]     1,621,000 [1],[3],[5],[17],[35]     1,621,000 [1],[3],[5],[17],[35]   1,475,000 [2],[8],[11],[18],[36]                
Cost 1,733,000 [1],[3],[5],[17],[35] 1,617,000 [2],[8],[11],[18],[36]     1,733,000 [1],[3],[5],[17],[35]     1,733,000 [1],[3],[5],[17],[35]   1,617,000 [2],[8],[11],[18],[36]                
Investment, Identifier [Axis]: Arc Education, Consumer Cyclical, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,266,000 [1],[3],[5],[17],[20] 2,969,000 [2],[8],[11],[18],[21]     3,266,000 [1],[3],[5],[17],[20]     3,266,000 [1],[3],[5],[17],[20]   2,969,000 [2],[8],[11],[18],[21]                
Cost 3,011,000 [1],[3],[5],[17],[20] 2,794,000 [2],[8],[11],[18],[21]     3,011,000 [1],[3],[5],[17],[20]     3,011,000 [1],[3],[5],[17],[20]   2,794,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Arc Education, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,732,000 1,900,000     1,732,000     1,732,000   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 9,086,000 [1],[3],[5],[6] 9,094,000 [2],[8],[11],[12]     9,086,000 [1],[3],[5],[6]     9,086,000 [1],[3],[5],[6]   9,094,000 [2],[8],[11],[12]                
Cost 9,128,000 [1],[3],[5],[6] 9,151,000 [2],[8],[11],[12]     9,128,000 [1],[3],[5],[6]     9,128,000 [1],[3],[5],[6]   9,151,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Archimede, Consumer Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,328,000 [1],[3],[5],[17],[20] 6,164,000 [2],[8],[11],[18],[21]     6,328,000 [1],[3],[5],[17],[20]     6,328,000 [1],[3],[5],[17],[20]   6,164,000 [2],[8],[11],[18],[21]                
Cost 6,486,000 [1],[3],[5],[17],[20] 6,474,000 [2],[8],[11],[18],[21]     6,486,000 [1],[3],[5],[17],[20]     6,486,000 [1],[3],[5],[17],[20]   6,474,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Argus Bidco Limited, CAF Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 693,000 789,000     693,000     693,000   789,000                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[5],[13],[17] 0 [2],[11],[14],[18]     0 [1],[5],[13],[17]     0 [1],[5],[13],[17]   0 [2],[11],[14],[18]                
Cost 1,000 [1],[5],[13],[17] 1,000 [2],[11],[14],[18]     1,000 [1],[5],[13],[17]     1,000 [1],[5],[13],[17]   1,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Equity Loan Notes                                    
Schedule of Investments [Line Items]                                    
Fair value 50,000 [1],[5],[17] 50,000 [2],[11],[18]     50,000 [1],[5],[17]     50,000 [1],[5],[17]   50,000 [2],[11],[18]                
Cost $ 54,000 [1],[5],[17] $ 51,000 [2],[11],[18]     $ 54,000 [1],[5],[17]     $ 54,000 [1],[5],[17]   $ 51,000 [2],[11],[18]                
Investment, interest rate, paid in kind 10.00% [1] 10.00% [2],[11],[18]     10.00% [1]     10.00% [1]   10.00% [2],[11],[18]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value $ 1,699,000 [1],[3],[5],[17],[20] $ 126,000 [2],[8],[11],[16],[18]     $ 1,699,000 [1],[3],[5],[17],[20]     $ 1,699,000 [1],[3],[5],[17],[20]   $ 126,000 [2],[8],[11],[16],[18]                
Cost 1,636,000 [1],[3],[5],[17],[20] 126,000 [2],[8],[11],[16],[18]     1,636,000 [1],[3],[5],[17],[20]     1,636,000 [1],[3],[5],[17],[20]   126,000 [2],[8],[11],[16],[18]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 125,000 [1],[3],[5],[15],[17] 1,536,000 [2],[8],[11],[18],[33]     125,000 [1],[3],[5],[15],[17]     125,000 [1],[3],[5],[15],[17]   1,536,000 [2],[8],[11],[18],[33]                
Cost 126,000 [1],[3],[5],[15],[17] 1,514,000 [2],[8],[11],[18],[33]     126,000 [1],[3],[5],[15],[17]     126,000 [1],[3],[5],[15],[17]   1,514,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3                                    
Schedule of Investments [Line Items]                                    
Fair value 1,609,000 [1],[3],[5],[17],[37] 1,547,000 [2],[8],[11],[18],[21]     1,609,000 [1],[3],[5],[17],[37]     1,609,000 [1],[3],[5],[17],[37]   1,547,000 [2],[8],[11],[18],[21]                
Cost 1,521,000 [1],[3],[5],[17],[37] 1,502,000 [2],[8],[11],[18],[21]     1,521,000 [1],[3],[5],[17],[37]     1,521,000 [1],[3],[5],[17],[37]   1,502,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 50,000 [1],[5],[17] 50,000 [2],[11],[18]     50,000 [1],[5],[17]     50,000 [1],[5],[17]   50,000 [2],[11],[18]                
Cost $ 54,000 [1],[5],[17] $ 51,000 [2],[11],[18]     $ 54,000 [1],[5],[17]     $ 54,000 [1],[5],[17]   $ 51,000 [2],[11],[18]                
Investment, interest rate, paid in kind 10.00% [1],[5],[17] 10.00% [2],[11],[18]     10.00% [1],[5],[17]     10.00% [1],[5],[17]   10.00% [2],[11],[18]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Second Lien Term Loan Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[17] $ 538,000       $ 538,000     $ 538,000                    
Cost [1],[5],[17] $ 517,000       $ 517,000     $ 517,000                    
Investment, interest rate, paid in kind [1],[5],[17] 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 [2],[11],[18]   $ 487,000               $ 487,000                
Cost [2],[11],[18]   $ 480,000               $ 480,000                
Investment, interest rate, paid in kind [2],[11],[18]   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 3,897,000 [1],[3],[5],[38] 3,896,000 [2],[8],[11],[12]     3,897,000 [1],[3],[5],[38]     3,897,000 [1],[3],[5],[38]   3,896,000 [2],[8],[11],[12]                
Cost 3,933,000 [1],[3],[5],[38] 3,950,000 [2],[8],[11],[12]     3,933,000 [1],[3],[5],[38]     3,933,000 [1],[3],[5],[38]   3,950,000 [2],[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 4,806,000 [1],[3],[5],[38] 4,932,000 [2],[8],[11],[26]     4,806,000 [1],[3],[5],[38]     4,806,000 [1],[3],[5],[38]   4,932,000 [2],[8],[11],[26]                
Cost 4,824,000 [1],[3],[5],[38] 4,946,000 [2],[8],[11],[26]     4,824,000 [1],[3],[5],[38]     4,824,000 [1],[3],[5],[38]   4,946,000 [2],[8],[11],[26]                
Investment, Identifier [Axis]: Astra Bidco Limited, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 602,000 876,000     602,000     602,000   876,000                
Investment, Identifier [Axis]: Astra Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,341,000 [1],[3],[5],[17],[35] 1,886,000 [2],[8],[11],[18],[33]     2,341,000 [1],[3],[5],[17],[35]     2,341,000 [1],[3],[5],[17],[35]   1,886,000 [2],[8],[11],[18],[33]                
Cost 2,426,000 [1],[3],[5],[17],[35] 2,103,000 [2],[8],[11],[18],[33]     2,426,000 [1],[3],[5],[17],[35]     2,426,000 [1],[3],[5],[17],[35]   2,103,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 1,349,000 [1],[3],[5],[17],[30] 1,305,000 [2],[8],[11],[18],[31]     1,349,000 [1],[3],[5],[17],[30]     1,349,000 [1],[3],[5],[17],[30]   1,305,000 [2],[8],[11],[18],[31]                
Cost 1,529,000 [1],[3],[5],[17],[30] 1,526,000 [2],[8],[11],[18],[31]     1,529,000 [1],[3],[5],[17],[30]     1,529,000 [1],[3],[5],[17],[30]   1,526,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 752,000 [1],[3],[5],[17],[35] 704,000 [2],[8],[11],[18],[33]     752,000 [1],[3],[5],[17],[35]     752,000 [1],[3],[5],[17],[35]   704,000 [2],[8],[11],[18],[33]                
Cost 903,000 [1],[3],[5],[17],[35] 901,000 [2],[8],[11],[18],[33]     903,000 [1],[3],[5],[17],[35]     903,000 [1],[3],[5],[17],[35]   901,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,272,000 1,295,000     1,272,000     1,272,000   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 2,252,000 [1],[3],[5],[17],[39] 2,298,000 [2],[8],[11],[18],[40]     2,252,000 [1],[3],[5],[17],[39]     2,252,000 [1],[3],[5],[17],[39]   2,298,000 [2],[8],[11],[18],[40]                
Cost 2,426,000 [1],[3],[5],[17],[39] 2,417,000 [2],[8],[11],[18],[40]     2,426,000 [1],[3],[5],[17],[39]     2,426,000 [1],[3],[5],[17],[39]   2,417,000 [2],[8],[11],[18],[40]                
Investment, Identifier [Axis]: Aviation Technical Services, Inc., Aerospace & Defense, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 28,867,000 [1],[3],[4],[5],[19] 27,794,000 [2],[8],[9],[11],[27]     28,867,000 [1],[3],[4],[5],[19]     28,867,000 [1],[3],[4],[5],[19]   27,794,000 [2],[8],[9],[11],[27]                
Cost $ 28,114,000 [1],[3],[4],[5],[19] $ 27,165,000 [2],[8],[9],[11],[27]     $ 28,114,000 [1],[3],[4],[5],[19]     $ 28,114,000 [1],[3],[4],[5],[19]   $ 27,165,000 [2],[8],[9],[11],[27]                
Investment, interest rate, paid in kind 6.50% [1],[3],[4],[5],[19] 6.50% [2],[8],[9],[11],[27]     6.50% [1],[3],[4],[5],[19]     6.50% [1],[3],[4],[5],[19]   6.50% [2],[8],[9],[11],[27]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount $ 962,000 $ 962,000     $ 962,000     $ 962,000   $ 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 153,000 [1],[5],[13] 183,000 [2],[11],[14]     153,000 [1],[5],[13]     153,000 [1],[5],[13]   183,000 [2],[11],[14]                
Cost 192,000 [1],[5],[13] 192,000 [2],[11],[14]     192,000 [1],[5],[13]     192,000 [1],[5],[13]   192,000 [2],[11],[14]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,485,000 [1],[3],[5],[6] 4,489,000 [2],[8],[11],[12]     4,485,000 [1],[3],[5],[6]     4,485,000 [1],[3],[5],[6]   4,489,000 [2],[8],[11],[12]                
Cost 4,452,000 [1],[3],[5],[6] 4,467,000 [2],[8],[11],[12]     4,452,000 [1],[3],[5],[6]     4,452,000 [1],[3],[5],[6]   4,467,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (5,000) [1],[3],[5],[6] (6,000) [2],[8],[11],[12]     (5,000) [1],[3],[5],[6]     (5,000) [1],[3],[5],[6]   (6,000) [2],[8],[11],[12]                
Cost (7,000) [1],[3],[5],[6] (8,000) [2],[8],[11],[12]     (7,000) [1],[3],[5],[6]     (7,000) [1],[3],[5],[6]   (8,000) [2],[8],[11],[12]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,477,000 [1],[5] 1,403,000 [2],[11]     1,477,000 [1],[5]     1,477,000 [1],[5]   1,403,000 [2],[11]                
Cost $ 1,498,000 [1],[5] $ 1,409,000 [2],[11]     $ 1,498,000 [1],[5]     $ 1,498,000 [1],[5]   $ 1,409,000 [2],[11]                
Investment, interest rate, paid in kind 12.00% [1],[5] 12.00% [2],[11]     12.00% [1],[5]     12.00% [1],[5]   12.00% [2],[11]                
Investment, Identifier [Axis]: BPG Holdings IV Corp, Capital Goods, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] $ 13,468,000       $ 13,468,000     $ 13,468,000                    
Cost [1],[3],[5],[15] 13,494,000       13,494,000     13,494,000                    
Investment, Identifier [Axis]: BVI Medical, Inc., Healthcare, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 9,474,000 [1],[3],[5],[20] $ 9,495,000 [2],[8],[11],[21]     9,474,000 [1],[3],[5],[20]     9,474,000 [1],[3],[5],[20]   $ 9,495,000 [2],[8],[11],[21]                
Cost 9,447,000 [1],[3],[5],[20] 9,404,000 [2],[8],[11],[21]     9,447,000 [1],[3],[5],[20]     9,447,000 [1],[3],[5],[20]   9,404,000 [2],[8],[11],[21]                
Investment, Identifier [Axis]: Bariacum S.A, Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 982,000 2,028,000     982,000     982,000   2,028,000                
Investment, Identifier [Axis]: Bariacum S.A, Consumer Products, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 7,310,000 [1],[3],[5],[17],[30] 5,944,000 [2],[8],[11],[18],[31]     7,310,000 [1],[3],[5],[17],[30]     7,310,000 [1],[3],[5],[17],[30]   5,944,000 [2],[8],[11],[18],[31]                
Cost 7,355,000 [1],[3],[5],[17],[30] 6,264,000 [2],[8],[11],[18],[31]     7,355,000 [1],[3],[5],[17],[30]     7,355,000 [1],[3],[5],[17],[30]   6,264,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Benify (Bennevis AB), High Tech Industries, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,022,000 [1],[3],[5],[17],[41] 1,060,000 [2],[8],[11],[18],[42]     1,022,000 [1],[3],[5],[17],[41]     1,022,000 [1],[3],[5],[17],[41]   1,060,000 [2],[8],[11],[18],[42]                
Cost 1,162,000 [1],[3],[5],[17],[41] 1,161,000 [2],[8],[11],[18],[42]     1,162,000 [1],[3],[5],[17],[41]     1,162,000 [1],[3],[5],[17],[41]   1,161,000 [2],[8],[11],[18],[42]                
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 2,509,000 [1],[3],[5],[24] 2,493,000 [2],[8],[11],[27]     2,509,000 [1],[3],[5],[24]     2,509,000 [1],[3],[5],[24]   2,493,000 [2],[8],[11],[27]                
Cost 2,505,000 [1],[3],[5],[24] 2,499,000 [2],[8],[11],[27]     2,505,000 [1],[3],[5],[24]     2,505,000 [1],[3],[5],[24]   2,499,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Bidwax, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 7,431,000 [1],[3],[5],[17],[30] 7,254,000 [2],[8],[11],[18],[31]     7,431,000 [1],[3],[5],[17],[30]     7,431,000 [1],[3],[5],[17],[30]   7,254,000 [2],[8],[11],[18],[31]                
Cost 8,103,000 [1],[3],[5],[17],[30] 8,089,000 [2],[8],[11],[18],[31]     8,103,000 [1],[3],[5],[17],[30]     8,103,000 [1],[3],[5],[17],[30]   8,089,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 2,436,000 [1],[3],[5],[15],[17] 2,484,000 [2],[8],[11],[16],[18]     2,436,000 [1],[3],[5],[15],[17]     2,436,000 [1],[3],[5],[15],[17]   2,484,000 [2],[8],[11],[16],[18]                
Cost 2,481,000 [1],[3],[5],[15],[17] 2,476,000 [2],[8],[11],[16],[18]     2,481,000 [1],[3],[5],[15],[17]     2,481,000 [1],[3],[5],[15],[17]   2,476,000 [2],[8],[11],[16],[18]                
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 821,000 [1],[3],[5],[17],[32] 792,000 [2],[8],[11],[18],[33]     821,000 [1],[3],[5],[17],[32]     821,000 [1],[3],[5],[17],[32]   792,000 [2],[8],[11],[18],[33]                
Cost 894,000 [1],[3],[5],[17],[32] 893,000 [2],[8],[11],[18],[33]     894,000 [1],[3],[5],[17],[32]     894,000 [1],[3],[5],[17],[32]   893,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Biolam Group, Consumer Non-cyclical, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,446,000 [1],[3],[5],[17],[20] 2,939,000 [2],[8],[11],[18],[21]     6,446,000 [1],[3],[5],[17],[20]     6,446,000 [1],[3],[5],[17],[20]   2,939,000 [2],[8],[11],[18],[21]                
Cost 6,367,000 [1],[3],[5],[17],[20] 2,956,000 [2],[8],[11],[18],[21]     6,367,000 [1],[3],[5],[17],[20]     6,367,000 [1],[3],[5],[17],[20]   2,956,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Biolam Group, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,489,000 4,783,000     1,489,000     1,489,000   4,783,000                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 417,000 417,000     417,000     417,000   417,000                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 5,647,000 5,647,000     5,647,000     5,647,000   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 $ 8,542,000 $ 9,147,000     $ 8,542,000     $ 8,542,000   $ 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 $ 5,647,000 [1],[3],[4],[5],[19] $ 5,647,000 [2],[8],[9],[11],[27]     $ 5,647,000 [1],[3],[4],[5],[19]     $ 5,647,000 [1],[3],[4],[5],[19]   $ 5,647,000 [2],[8],[9],[11],[27]                
Cost 5,647,000 [1],[3],[4],[5],[19] 5,647,000 [2],[8],[9],[11],[27]     5,647,000 [1],[3],[4],[5],[19]     5,647,000 [1],[3],[4],[5],[19]   5,647,000 [2],[8],[9],[11],[27]                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 8,542,000 [1],[4],[5],[7] 9,147,000 [2],[9],[10],[11]     8,542,000 [1],[4],[5],[7]     8,542,000 [1],[4],[5],[7]   9,147,000 [2],[9],[10],[11]                
Cost $ 9,629,000 [1],[4],[5],[7] $ 9,628,000 [2],[9],[10],[11]     $ 9,629,000 [1],[4],[5],[7]     $ 9,629,000 [1],[4],[5],[7]   $ 9,628,000 [2],[9],[10],[11]                
Investment, interest rate, paid in kind 10.00% [1],[4],[5],[7] 10.00% [2],[9],[10],[11]     10.00% [1],[4],[5],[7]     10.00% [1],[4],[5],[7]   10.00% [2],[9],[10],[11]                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value $ 0 [1],[4],[5],[13] $ 0 [2],[9],[11],[14]     $ 0 [1],[4],[5],[13]     $ 0 [1],[4],[5],[13]   $ 0 [2],[9],[11],[14]                
Cost 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[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 1,619,000 [1],[3],[5],[15] 1,735,000 [2],[8],[11],[12]     1,619,000 [1],[3],[5],[15]     1,619,000 [1],[3],[5],[15]   1,735,000 [2],[8],[11],[12]                
Cost 1,814,000 [1],[3],[5],[15] 1,816,000 [2],[8],[11],[12]     1,814,000 [1],[3],[5],[15]     1,814,000 [1],[3],[5],[15]   1,816,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Municipal Revenue Bond                                    
Schedule of Investments [Line Items]                                    
Fair value 28,339,000 [1] 28,300,000 [2]     28,339,000 [1]     28,339,000 [1]   28,300,000 [2]                
Cost 27,200,000 [1] 27,200,000 [2]     27,200,000 [1]     27,200,000 [1]   27,200,000 [2]                
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Preferred Stock- Series C                                    
Schedule of Investments [Line Items]                                    
Fair value 15,127,000 [1],[5] 14,731,000 [2],[11]     15,127,000 [1],[5]     15,127,000 [1],[5]   14,731,000 [2],[11]                
Cost $ 14,992,000 [1],[5] $ 14,460,000 [2],[11]     $ 14,992,000 [1],[5]     $ 14,992,000 [1],[5]   $ 14,460,000 [2],[11]                
Investment, interest rate, paid in kind 7.00% [1],[5] 7.00% [2],[11]     7.00% [1],[5]     7.00% [1],[5]   7.00% [2],[11]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value $ 4,693,000 [1],[3],[5],[15] $ 4,724,000 [2],[8],[11],[12]     $ 4,693,000 [1],[3],[5],[15]     $ 4,693,000 [1],[3],[5],[15]   $ 4,724,000 [2],[8],[11],[12]                
Cost 4,693,000 [1],[3],[5],[15] 4,728,000 [2],[8],[11],[12]     4,693,000 [1],[3],[5],[15]     4,693,000 [1],[3],[5],[15]   4,728,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, LLC units                                    
Schedule of Investments [Line Items]                                    
Fair value 1,351,000 [1],[5],[13] 1,152,000 [2],[11],[14]     1,351,000 [1],[5],[13]     1,351,000 [1],[5],[13]   1,152,000 [2],[11],[14]                
Cost 1,107,000 [1],[5],[13] 1,108,000 [2],[11],[14]     1,107,000 [1],[5],[13]     1,107,000 [1],[5],[13]   1,108,000 [2],[11],[14]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 876,000 [1],[3],[5],[15] (12,000) [2],[8],[11],[12]     876,000 [1],[3],[5],[15]     876,000 [1],[3],[5],[15]   (12,000) [2],[8],[11],[12]                
Cost 876,000 [1],[3],[5],[15] (11,000) [2],[8],[11],[12]     876,000 [1],[3],[5],[15]     876,000 [1],[3],[5],[15]   (11,000) [2],[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 4,500,000 [1],[5] 4,350,000 [2],[11]     4,500,000 [1],[5]     4,500,000 [1],[5]   4,350,000 [2],[11]                
Cost 5,000,000 [1],[5] 5,000,000 [2],[11]     5,000,000 [1],[5]     5,000,000 [1],[5]   5,000,000 [2],[11]                
Investment, Identifier [Axis]: Brightpay Limited, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 138,000 135,000     138,000     138,000   135,000                
Investment, Identifier [Axis]: Brightpay Limited, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,213,000 [1],[3],[5],[17],[20] 2,156,000 [2],[8],[11],[18],[21]     2,213,000 [1],[3],[5],[17],[20]     2,213,000 [1],[3],[5],[17],[20]   2,156,000 [2],[8],[11],[18],[21]                
Cost 2,299,000 [1],[3],[5],[17],[20] 2,296,000 [2],[8],[11],[18],[21]     2,299,000 [1],[3],[5],[17],[20]     2,299,000 [1],[3],[5],[17],[20]   2,296,000 [2],[8],[11],[18],[21]                
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 654,000 [1] 692,000 [2]     654,000 [1]     654,000 [1]   692,000 [2]                
Cost 649,000 [1] 703,000 [2]     649,000 [1]     649,000 [1]   703,000 [2]                
Investment, Identifier [Axis]: British Engineering Services Holdco Limited, Commercial Services & Supplies, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 14,291,000 [1],[3],[5],[17],[35] 13,454,000 [2],[8],[11],[18],[33]     14,291,000 [1],[3],[5],[17],[35]     14,291,000 [1],[3],[5],[17],[35]   13,454,000 [2],[8],[11],[18],[33]                
Cost 15,160,000 [1],[3],[5],[17],[35] 15,133,000 [2],[8],[11],[18],[33]     15,160,000 [1],[3],[5],[17],[35]     15,160,000 [1],[3],[5],[17],[35]   15,133,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Brook & Whittle Holding Corp., Containers, Packaging & Glass, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,564,000 [1],[3],[4],[15] 2,478,000 [2],[8],[9],[16]     2,564,000 [1],[3],[4],[15]     2,564,000 [1],[3],[4],[15]   2,478,000 [2],[8],[9],[16]                
Cost 2,793,000 [1],[3],[4],[15] 2,807,000 [2],[8],[9],[16]     2,793,000 [1],[3],[4],[15]     2,793,000 [1],[3],[4],[15]   2,807,000 [2],[8],[9],[16]                
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 [1],[3],[5],[15] 6,281,000 [2],[8],[11],[12]     6,155,000 [1],[3],[5],[15]     6,155,000 [1],[3],[5],[15]   6,281,000 [2],[8],[11],[12]                
Cost 6,260,000 [1],[3],[5],[15] 6,252,000 [2],[8],[11],[12]     6,260,000 [1],[3],[5],[15]     6,260,000 [1],[3],[5],[15]   6,252,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, LP Units                                    
Schedule of Investments [Line Items]                                    
Fair value 501,000 [1],[5],[13] 446,000 [2],[11],[14]     501,000 [1],[5],[13]     501,000 [1],[5],[13]   446,000 [2],[11],[14]                
Cost 455,000 [1],[5],[13] 455,000 [2],[11],[14]     455,000 [1],[5],[13]     455,000 [1],[5],[13]   455,000 [2],[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 4,418,000 [1],[3],[5],[24] 4,390,000 [2],[8],[11],[25]     4,418,000 [1],[3],[5],[24]     4,418,000 [1],[3],[5],[24]   4,390,000 [2],[8],[11],[25]                
Cost 4,378,000 [1],[3],[5],[24] 4,370,000 [2],[8],[11],[25]     4,378,000 [1],[3],[5],[24]     4,378,000 [1],[3],[5],[24]   4,370,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: CATAWBA RIVER LIMITED, Finance Companies, Structured - Junior Note                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[11],[18]   5,239,000               5,239,000                
Cost [2],[11],[18]   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 4,615,000 [1],[3],[5],[6] 1,341,000 [2],[8],[11],[12]     4,615,000 [1],[3],[5],[6]     4,615,000 [1],[3],[5],[6]   1,341,000 [2],[8],[11],[12]                
Cost 4,902,000 [1],[3],[5],[6] 1,352,000 [2],[8],[11],[12]     4,902,000 [1],[3],[5],[6]     4,902,000 [1],[3],[5],[6]   1,352,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 1,269,000 [1],[3],[5],[6] 4,879,000 [2],[8],[11],[12]     1,269,000 [1],[3],[5],[6]     1,269,000 [1],[3],[5],[6]   4,879,000 [2],[8],[11],[12]                
Cost 1,347,000 [1],[3],[5],[6] 4,921,000 [2],[8],[11],[12]     1,347,000 [1],[3],[5],[6]     1,347,000 [1],[3],[5],[6]   4,921,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: CAi Software, LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (70,000) [1],[3],[5],[6] (24,000) [2],[8],[11],[12]     (70,000) [1],[3],[5],[6]     (70,000) [1],[3],[5],[6]   (24,000) [2],[8],[11],[12]                
Cost (15,000) [1],[3],[5],[6] (16,000) [2],[8],[11],[12]     (15,000) [1],[3],[5],[6]     (15,000) [1],[3],[5],[6]   (16,000) [2],[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 5,084,000 [1],[3],[5],[15] 10,377,000 [2],[8],[11],[27]     5,084,000 [1],[3],[5],[15]     5,084,000 [1],[3],[5],[15]   10,377,000 [2],[8],[11],[27]                
Cost 5,146,000 [1],[3],[5],[15] 10,510,000 [2],[8],[11],[27]     5,146,000 [1],[3],[5],[15]     5,146,000 [1],[3],[5],[15]   10,510,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 1,344,000 [1],[3],[5],[15] 1,344,000 [2],[8],[11],[16]     1,344,000 [1],[3],[5],[15]     1,344,000 [1],[3],[5],[15]   1,344,000 [2],[8],[11],[16]                
Cost 1,340,000 [1],[3],[5],[15] 1,344,000 [2],[8],[11],[16]     1,340,000 [1],[3],[5],[15]     1,340,000 [1],[3],[5],[15]   1,344,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 995,000 [1],[5],[13] 1,027,000 [2],[11],[14]     995,000 [1],[5],[13]     995,000 [1],[5],[13]   1,027,000 [2],[11],[14]                
Cost 551,000 [1],[5],[13] 551,000 [2],[11],[14]     551,000 [1],[5],[13]     551,000 [1],[5],[13]   551,000 [2],[11],[14]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[27]   (49,000)               (49,000)                
Cost [2],[8],[11],[27]   (29,000)               (29,000)                
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 18,211,000 [1],[3],[5],[15] 18,060,000 [2],[8],[11],[16]     18,211,000 [1],[3],[5],[15]     18,211,000 [1],[3],[5],[15]   18,060,000 [2],[8],[11],[16]                
Cost 18,694,000 [1],[3],[5],[15] 18,761,000 [2],[8],[11],[16]     18,694,000 [1],[3],[5],[15]     18,694,000 [1],[3],[5],[15]   18,761,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,744,000 [1],[3],[5],[24] 3,928,000 [2],[8],[11],[12]     3,744,000 [1],[3],[5],[24]     3,744,000 [1],[3],[5],[24]   3,928,000 [2],[8],[11],[12]                
Cost 4,104,000 [1],[3],[5],[24] 4,076,000 [2],[8],[11],[12]     4,104,000 [1],[3],[5],[24]     4,104,000 [1],[3],[5],[24]   4,076,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[11]   165,000               165,000                
Cost 352,000 [1],[5],[13] 352,000 [2],[11]     352,000 [1],[5],[13]     352,000 [1],[5],[13]   352,000 [2],[11]                
Investment, Identifier [Axis]: CSL DualCom, Tele-communications, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,041,000 [1],[3],[5],[17],[37] 1,921,000 [2],[8],[11],[18],[43]     2,041,000 [1],[3],[5],[17],[37]     2,041,000 [1],[3],[5],[17],[37]   1,921,000 [2],[8],[11],[18],[43]                
Cost 1,909,000 [1],[3],[5],[17],[37] 1,905,000 [2],[8],[11],[18],[43]     1,909,000 [1],[3],[5],[17],[37]     1,909,000 [1],[3],[5],[17],[37]   1,905,000 [2],[8],[11],[18],[43]                
Investment, Identifier [Axis]: CSL Dualcom, Capex / Acquisition Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 150,000 142,000     150,000     150,000   142,000                
Investment, Identifier [Axis]: CT Technologies Intermediate Holdings, Inc., Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,557,000 [1],[3],[4],[24] 4,505,000 [2],[8],[9],[27]     4,557,000 [1],[3],[4],[24]     4,557,000 [1],[3],[4],[24]   4,505,000 [2],[8],[9],[27]                
Cost 4,905,000 [1],[3],[4],[24] 4,930,000 [2],[8],[9],[27]     4,905,000 [1],[3],[4],[24]     4,905,000 [1],[3],[4],[24]   4,930,000 [2],[8],[9],[27]                
Investment, Identifier [Axis]: CVL 3, Capital Equipment, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 914,000 [1],[3],[5],[17],[20] 891,000 [2],[8],[11],[18],[21]     914,000 [1],[3],[5],[17],[20]     914,000 [1],[3],[5],[17],[20]   891,000 [2],[8],[11],[18],[21]                
Cost 940,000 [1],[3],[5],[17],[20] 938,000 [2],[8],[11],[18],[21]     940,000 [1],[3],[5],[17],[20]     940,000 [1],[3],[5],[17],[20]   938,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: CVL 3, Capital Equipment, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 1,126,000 [1],[3],[5],[15],[17] 1,122,000 [2],[8],[11],[16],[18]     1,126,000 [1],[3],[5],[15],[17]     1,126,000 [1],[3],[5],[15],[17]   1,122,000 [2],[8],[11],[16],[18]                
Cost 1,119,000 [1],[3],[5],[15],[17] 1,117,000 [2],[8],[11],[16],[18]     1,119,000 [1],[3],[5],[15],[17]     1,119,000 [1],[3],[5],[15],[17]   1,117,000 [2],[8],[11],[16],[18]                
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[6] 2,763,000       2,763,000     2,763,000                    
Cost [1],[3],[5],[6] 2,735,000       2,735,000     2,735,000                    
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 293,000 [1],[5],[13] 204,000 [2],[11],[14]     293,000 [1],[5],[13]     293,000 [1],[5],[13]   204,000 [2],[11],[14]                
Cost 161,000 [1],[5],[13] 161,000 [2],[11],[14]     161,000 [1],[5],[13]     161,000 [1],[5],[13]   161,000 [2],[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 [2],[8],[11],[27]   2,766,000               2,766,000                
Cost [2],[8],[11],[27]   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 6,670,000 [1],[3],[5],[6] 6,580,000 [2],[8],[11],[12]     6,670,000 [1],[3],[5],[6]     6,670,000 [1],[3],[5],[6]   6,580,000 [2],[8],[11],[12]                
Cost 6,748,000 [1],[3],[5],[6] 6,741,000 [2],[8],[11],[12]     6,748,000 [1],[3],[5],[6]     6,748,000 [1],[3],[5],[6]   6,741,000 [2],[8],[11],[12]                
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 11,108,000 [1],[3],[5],[6] 11,080,000 [2],[8],[11],[12]     11,108,000 [1],[3],[5],[6]     11,108,000 [1],[3],[5],[6]   11,080,000 [2],[8],[11],[12]                
Cost 11,279,000 [1],[3],[5],[6] 11,161,000 [2],[8],[11],[12]     11,279,000 [1],[3],[5],[6]     11,279,000 [1],[3],[5],[6]   11,161,000 [2],[8],[11],[12]                
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 [2],[11],[14],[18]   292,000               292,000                
Cost 389,000 [1],[5],[13],[17] 389,000 [2],[11],[14],[18]     389,000 [1],[5],[13],[17]     389,000 [1],[5],[13],[17]   389,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class C - Warrants                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[11],[14],[18]   0               0                
Cost [2],[11],[14],[18]   0               0                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,429,000 [1],[3],[5],[17],[44] 1,468,000 [2],[8],[11],[18],[45]     1,429,000 [1],[3],[5],[17],[44]     1,429,000 [1],[3],[5],[17],[44]   1,468,000 [2],[8],[11],[18],[45]                
Cost $ 1,791,000 [1],[3],[5],[17],[44] 1,729,000 [2],[8],[11],[18],[45]     $ 1,791,000 [1],[3],[5],[17],[44]     $ 1,791,000 [1],[3],[5],[17],[44]   1,729,000 [2],[8],[11],[18],[45]                
Investment, interest rate, paid in kind [1],[3],[5],[17],[44] 3.50%       3.50%     3.50%                    
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value $ 4,279,000 [1],[3],[5],[15],[17] 4,269,000 [2],[8],[11],[16],[18]     $ 4,279,000 [1],[3],[5],[15],[17]     $ 4,279,000 [1],[3],[5],[15],[17]   4,269,000 [2],[8],[11],[16],[18]                
Cost 4,267,000 [1],[3],[5],[15],[17] 4,261,000 [2],[8],[11],[16],[18]     4,267,000 [1],[3],[5],[15],[17]     4,267,000 [1],[3],[5],[15],[17]   4,261,000 [2],[8],[11],[16],[18]                
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 638,000 [1],[5],[13],[17] 627,000 [2],[11],[14],[18]     638,000 [1],[5],[13],[17]     638,000 [1],[5],[13],[17]   627,000 [2],[11],[14],[18]                
Cost 682,000 [1],[5],[13],[17] 682,000 [2],[11],[14],[18]     682,000 [1],[5],[13],[17]     682,000 [1],[5],[13],[17]   682,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 905,000 [1],[13] 1,339,000 [2],[14]     905,000 [1],[13]     905,000 [1],[13]   1,339,000 [2],[14]                
Cost 4,194,000 [1],[13] 4,194,000 [2],[14]     4,194,000 [1],[13]     4,194,000 [1],[13]   4,194,000 [2],[14]                
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, First Lien Senior Secured Note                                    
Schedule of Investments [Line Items]                                    
Fair value 3,304,000 [1] 5,113,000 [2]     3,304,000 [1]     3,304,000 [1]   5,113,000 [2]                
Cost 5,756,000 [1] 5,720,000 [2]     5,756,000 [1]     5,756,000 [1]   5,720,000 [2]                
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, Series A Convertible Preferred                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 681,000       681,000     681,000                    
Cost [1],[5],[13] 955,000       955,000     955,000                    
Investment, Identifier [Axis]: Catawba River Limited, Finance Companies, Structured - Junior Note                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[17] 4,044,000       4,044,000     4,044,000                    
Cost [1],[5],[17] 5,268,000       5,268,000     5,268,000                    
Investment, Identifier [Axis]: Catawba River Limited, Structured Junior Note                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 12,998,000 12,635,000     12,998,000     12,998,000   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 2,175,000 [1],[3],[5],[17],[20] 820,000 [2],[8],[11],[18],[21]     2,175,000 [1],[3],[5],[17],[20]     2,175,000 [1],[3],[5],[17],[20]   820,000 [2],[8],[11],[18],[21]                
Cost 2,053,000 [1],[3],[5],[17],[20] 768,000 [2],[8],[11],[18],[21]     2,053,000 [1],[3],[5],[17],[20]     2,053,000 [1],[3],[5],[17],[20]   768,000 [2],[8],[11],[18],[21]                
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 [2],[8],[11],[18],[21]   1,158,000               1,158,000                
Cost [2],[8],[11],[18],[21]   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 925,000 1,028,000     925,000     925,000   1,028,000                
Investment, Identifier [Axis]: Ceres Pharma NV, Pharma-ceuticals, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,296,000 [1],[3],[5],[17],[30] 3,139,000 [2],[8],[11],[18],[31]     3,296,000 [1],[3],[5],[17],[30]     3,296,000 [1],[3],[5],[17],[30]   3,139,000 [2],[8],[11],[18],[31]                
Cost 3,271,000 [1],[3],[5],[17],[30] 3,264,000 [2],[8],[11],[18],[31]     3,271,000 [1],[3],[5],[17],[30]     3,271,000 [1],[3],[5],[17],[30]   3,264,000 [2],[8],[11],[18],[31]                
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 [2],[11],[14],[18]   0               0                
Cost 102,000 [1],[13],[17] 102,000 [2],[11],[14],[18]     102,000 [1],[13],[17]     102,000 [1],[13],[17]   102,000 [2],[11],[14],[18]                
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 6,191,000 [1],[3],[5],[24] 6,189,000 [2],[8],[11],[27]     6,191,000 [1],[3],[5],[24]     6,191,000 [1],[3],[5],[24]   6,189,000 [2],[8],[11],[27]                
Cost 6,172,000 [1],[3],[5],[24] 6,182,000 [2],[8],[11],[27]     6,172,000 [1],[3],[5],[24]     6,172,000 [1],[3],[5],[24]   6,182,000 [2],[8],[11],[27]                
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],[3],[5],[24] 599,000       599,000     599,000                    
Cost [1],[3],[5],[24] 596,000       596,000     596,000                    
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 [2],[8],[11],[27]   523,000               523,000                
Cost [2],[8],[11],[27]   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]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 10,882,000       10,882,000     10,882,000                    
Cost [1],[5],[13] 9,093,000       9,093,000     9,093,000                    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5] 6,513,000       6,513,000     6,513,000                    
Cost [1],[5] $ 6,552,000       $ 6,552,000     $ 6,552,000                    
Investment, interest rate, paid in kind [1],[5] 10.00%       10.00%     10.00%                    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5] $ 15,588,000       $ 15,588,000     $ 15,588,000                    
Cost [1],[5] 15,551,000       15,551,000     15,551,000                    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[11],[14]   10,729,000               10,729,000                
Cost [2],[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 [2],[11]   6,036,000               6,036,000                
Cost [2],[11]   $ 6,054,000               $ 6,054,000                
Investment, interest rate, paid in kind [2],[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 [2],[11]   $ 15,528,000               $ 15,528,000                
Cost [2],[11]   15,509,000               15,509,000                
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, Diversified Manufacturing                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[12],[18]   1,270,000               1,270,000                
Cost [2],[8],[11],[12],[18]   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 [1],[3],[5],[6],[17] 1,288,000       1,288,000     1,288,000                    
Cost [1],[3],[5],[6],[17] 1,279,000       1,279,000     1,279,000                    
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, Class B Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 218,000 [1],[5],[13] 196,000 [2],[11],[14]     218,000 [1],[5],[13]     218,000 [1],[5],[13]   196,000 [2],[11],[14]                
Cost 0 [1],[5],[13] 0 [2],[11],[14]     0 [1],[5],[13]     0 [1],[5],[13]   0 [2],[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 [1],[3],[5],[24] 13,302,000 [2],[8],[11],[25]     13,345,000 [1],[3],[5],[24]     13,345,000 [1],[3],[5],[24]   13,302,000 [2],[8],[11],[25]                
Cost 13,275,000 [1],[3],[5],[24] 13,316,000 [2],[8],[11],[25]     13,275,000 [1],[3],[5],[24]     13,275,000 [1],[3],[5],[24]   13,316,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 162,000 [1],[5],[13] 159,000 [2],[11],[14]     162,000 [1],[5],[13]     162,000 [1],[5],[13]   159,000 [2],[11],[14]                
Cost 125,000 [1],[5],[13] 125,000 [2],[11],[14]     125,000 [1],[5],[13]     125,000 [1],[5],[13]   125,000 [2],[11],[14]                
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, Senior Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 622,000 [1],[5] 369,000 [2],[11]     622,000 [1],[5]     622,000 [1],[5]   369,000 [2],[11]                
Cost $ 627,000 [1],[5] $ 371,000 [2],[11]     $ 627,000 [1],[5]     $ 627,000 [1],[5]   $ 371,000 [2],[11]                
Investment, interest rate, paid in kind 1.00% [1],[5] 1.00% [2],[11]     1.00% [1],[5]     1.00% [1],[5]   1.00% [2],[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 13,185,000 [1],[3],[5],[38] 13,446,000 [2],[8],[11],[26]     13,185,000 [1],[3],[5],[38]     13,185,000 [1],[3],[5],[38]   13,446,000 [2],[8],[11],[26]                
Cost 13,123,000 [1],[3],[5],[38] 13,407,000 [2],[8],[11],[26]     13,123,000 [1],[3],[5],[38]     13,123,000 [1],[3],[5],[38]   13,407,000 [2],[8],[11],[26]                
Investment, Identifier [Axis]: Comply365, LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (13,000) [1],[3],[5],[38] 148,000 [2],[8],[11],[26]     (13,000) [1],[3],[5],[38]     (13,000) [1],[3],[5],[38]   148,000 [2],[8],[11],[26]                
Cost (18,000) [1],[3],[5],[38] 146,000 [2],[8],[11],[26]     (18,000) [1],[3],[5],[38]     (18,000) [1],[3],[5],[38]   146,000 [2],[8],[11],[26]                
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 4,989,000 [1],[3],[5],[17],[20] 4,845,000 [2],[8],[11],[18],[21]     4,989,000 [1],[3],[5],[17],[20]     4,989,000 [1],[3],[5],[17],[20]   4,845,000 [2],[8],[11],[18],[21]                
Cost 4,531,000 [1],[3],[5],[17],[20] 4,524,000 [2],[8],[11],[18],[21]     4,531,000 [1],[3],[5],[17],[20]     4,531,000 [1],[3],[5],[17],[20]   4,524,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 78,000 [1],[13] 7,000 [2],[14]     78,000 [1],[13]     78,000 [1],[13]   7,000 [2],[14]                
Cost 296,000 [1],[13] 296,000 [2],[14]     296,000 [1],[13]     296,000 [1],[13]   296,000 [2],[14]                
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 16,929,000 [1],[5],[7] 11,118,000 [2],[10],[11]     16,929,000 [1],[5],[7]     16,929,000 [1],[5],[7]   11,118,000 [2],[10],[11]                
Cost 29,619,000 [1],[5],[7] 29,619,000 [2],[10],[11]     29,619,000 [1],[5],[7]     29,619,000 [1],[5],[7]   29,619,000 [2],[10],[11]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 429,000 419,000     429,000     429,000   419,000                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class A Units                                    
Schedule of Investments [Line Items]                                    
Fair value 205,000 [1],[5],[13],[17] 196,000 [2],[11],[14],[18]     205,000 [1],[5],[13],[17]     205,000 [1],[5],[13],[17]   196,000 [2],[11],[14],[18]                
Cost 205,000 [1],[5],[13],[17] 205,000 [2],[11],[14],[18]     205,000 [1],[5],[13],[17]     205,000 [1],[5],[13],[17]   205,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class B Units                                    
Schedule of Investments [Line Items]                                    
Fair value 518,000 [1],[5],[13],[17] 497,000 [2],[11],[14],[18]     518,000 [1],[5],[13],[17]     518,000 [1],[5],[13],[17]   497,000 [2],[11],[14],[18]                
Cost 446,000 [1],[5],[13],[17] 446,000 [2],[11],[14],[18]     446,000 [1],[5],[13],[17]     446,000 [1],[5],[13],[17]   446,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,478,000 [1],[3],[5],[17],[30] 4,233,000 [2],[8],[11],[18],[31]     4,478,000 [1],[3],[5],[17],[30]     4,478,000 [1],[3],[5],[17],[30]   4,233,000 [2],[8],[11],[18],[31]                
Cost $ 4,723,000 [1],[3],[5],[17],[30] $ 4,638,000 [2],[8],[11],[18],[31]     $ 4,723,000 [1],[3],[5],[17],[30]     $ 4,723,000 [1],[3],[5],[17],[30]   $ 4,638,000 [2],[8],[11],[18],[31]                
Investment, interest rate, paid in kind 3.50% [1],[3],[5],[17],[30] 3.50% [2],[8],[11],[18],[31]     3.50% [1],[3],[5],[17],[30]     3.50% [1],[3],[5],[17],[30]   3.50% [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Custom Alloy Corporation, Manufacturer of Pipe Fittings & Forgings, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[10],[11],[46]   $ 189,000               $ 189,000                
Cost [2],[10],[11],[46]   $ 4,222,000               $ 4,222,000                
Investment, interest rate, paid in kind [2],[10],[11],[46]   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 [2],[10],[11],[46]   $ 1,997,000               $ 1,997,000                
Cost [2],[10],[11],[46]   $ 42,162,000               $ 42,162,000                
Investment, interest rate, paid in kind [2],[10],[11],[46]   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 5,672,000 [1],[3],[5],[24] 5,491,000 [2],[8],[11],[25]     5,672,000 [1],[3],[5],[24]     5,672,000 [1],[3],[5],[24]   5,491,000 [2],[8],[11],[25]                
Cost 5,565,000 [1],[3],[5],[24] 5,496,000 [2],[8],[11],[25]     5,565,000 [1],[3],[5],[24]     5,565,000 [1],[3],[5],[24]   5,496,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (5,000) [1],[3],[5],[24] 0 [2],[8],[11],[25]     (5,000) [1],[3],[5],[24]     (5,000) [1],[3],[5],[24]   0 [2],[8],[11],[25]                
Cost (12,000) [1],[3],[5],[24] 0 [2],[8],[11],[25]     (12,000) [1],[3],[5],[24]     (12,000) [1],[3],[5],[24]   0 [2],[8],[11],[25]                
Investment, Identifier [Axis]: DISA Holdings Corp., Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 429,000 416,000     429,000     429,000   416,000                
Investment, Identifier [Axis]: DataOnline Corp., High Tech Industries, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 14,330,000 [1],[3],[4],[5],[6] 14,259,000 [2],[8],[9],[11],[12]     14,330,000 [1],[3],[4],[5],[6]     14,330,000 [1],[3],[4],[5],[6]   14,259,000 [2],[8],[9],[11],[12]                
Cost 14,475,000 [1],[3],[4],[5],[6] 14,550,000 [2],[8],[9],[11],[12]     14,475,000 [1],[3],[4],[5],[6]     14,475,000 [1],[3],[4],[5],[6]   14,550,000 [2],[8],[9],[11],[12]                
Investment, Identifier [Axis]: DataOnline Corp., High Tech Industries, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 2,121,000 [1],[3],[4],[5],[6] 2,100,000 [2],[8],[9],[11],[12]     2,121,000 [1],[3],[4],[5],[6]     2,121,000 [1],[3],[4],[5],[6]   2,100,000 [2],[8],[9],[11],[12]                
Cost 2,143,000 [1],[3],[4],[5],[6] 2,143,000 [2],[8],[9],[11],[12]     2,143,000 [1],[3],[4],[5],[6]     2,143,000 [1],[3],[4],[5],[6]   2,143,000 [2],[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 1,875,000 [1],[3],[5],[15] 1,875,000 [2],[8],[11],[16]     1,875,000 [1],[3],[5],[15]     1,875,000 [1],[3],[5],[15]   1,875,000 [2],[8],[11],[16]                
Cost 1,869,000 [1],[3],[5],[15] 1,876,000 [2],[8],[11],[16]     1,869,000 [1],[3],[5],[15]     1,869,000 [1],[3],[5],[15]   1,876,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 96,000 [1],[5],[13] 96,000 [2],[11],[14]     96,000 [1],[5],[13]     96,000 [1],[5],[13]   96,000 [2],[11],[14]                
Cost 96,000 [1],[5],[13] 96,000 [2],[11],[14]     96,000 [1],[5],[13]     96,000 [1],[5],[13]   96,000 [2],[11],[14]                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (8,000) [1],[3],[5],[15] (11,000) [2],[8],[11],[16]     (8,000) [1],[3],[5],[15]     (8,000) [1],[3],[5],[15]   (11,000) [2],[8],[11],[16]                
Cost (9,000) [1],[3],[5],[15] (10,000) [2],[8],[11],[16]     (9,000) [1],[3],[5],[15]     (9,000) [1],[3],[5],[15]   (10,000) [2],[8],[11],[16]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 52,000 [1],[5],[13] 48,000 [2],[11],[14]     52,000 [1],[5],[13]     52,000 [1],[5],[13]   48,000 [2],[11],[14]                
Cost 55,000 [1],[5],[13] 55,000 [2],[11],[14]     55,000 [1],[5],[13]     55,000 [1],[5],[13]   55,000 [2],[11],[14]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 631,000 [1],[3],[5],[24] 690,000 [2],[8],[11],[27]     631,000 [1],[3],[5],[24]     631,000 [1],[3],[5],[24]   690,000 [2],[8],[11],[27]                
Cost 628,000 [1],[3],[5],[24] 688,000 [2],[8],[11],[27]     628,000 [1],[3],[5],[24]     628,000 [1],[3],[5],[24]   688,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (2,000) [1],[3],[5],[24] (3,000) [2],[8],[11],[27]     (2,000) [1],[3],[5],[24]     (2,000) [1],[3],[5],[24]   (3,000) [2],[8],[11],[27]                
Cost (3,000) [1],[3],[5],[24] (3,000) [2],[8],[11],[27]     (3,000) [1],[3],[5],[24]     (3,000) [1],[3],[5],[24]   (3,000) [2],[8],[11],[27]                
Investment, Identifier [Axis]: DecksDirect, LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 218,000 218,000     218,000     218,000   218,000                
Investment, Identifier [Axis]: Distinct Holdings, Inc., Systems Software, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,392,000 [1],[3],[5],[15] 6,096,000 [2],[8],[11],[12]     6,392,000 [1],[3],[5],[15]     6,392,000 [1],[3],[5],[15]   6,096,000 [2],[8],[11],[12]                
Cost 6,712,000 [1],[3],[5],[15] 6,860,000 [2],[8],[11],[12]     6,712,000 [1],[3],[5],[15]     6,712,000 [1],[3],[5],[15]   6,860,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[30] 2,689,000       2,689,000     2,689,000                    
Cost [1],[3],[5],[17],[30] 2,824,000       2,824,000     2,824,000                    
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[18],[21]   2,515,000               2,515,000                
Cost [2],[8],[11],[18],[21]   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 [2],[8],[11],[18],[31]   1,153,000               1,153,000                
Cost [2],[8],[11],[18],[31]   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 2,320,000 [1],[3],[5],[17],[30] 2,247,000 [2],[8],[11],[18],[21]     2,320,000 [1],[3],[5],[17],[30]     2,320,000 [1],[3],[5],[17],[30]   2,247,000 [2],[8],[11],[18],[21]                
Cost 2,319,000 [1],[3],[5],[17],[30] 2,305,000 [2],[8],[11],[18],[21]     2,319,000 [1],[3],[5],[17],[30]     2,319,000 [1],[3],[5],[17],[30]   2,305,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Dryden 43 Senior Loan Fund, Series 2016-43A, Multi-Sector Holdings, Subordinated Structured Notes                                    
Schedule of Investments [Line Items]                                    
Fair value 1,731,000 [1],[4],[17] 2,084,000 [2],[9],[18]     1,731,000 [1],[4],[17]     1,731,000 [1],[4],[17]   2,084,000 [2],[9],[18]                
Cost 2,225,000 [1],[4],[17] 2,329,000 [2],[9],[18]     2,225,000 [1],[4],[17]     2,225,000 [1],[4],[17]   2,329,000 [2],[9],[18]                
Investment, Identifier [Axis]: Dryden 49 Senior Loan Fund, Series 2017-49A, Multi-Sector Holdings, Subordinated Structured Notes                                    
Schedule of Investments [Line Items]                                    
Fair value 3,157,000 [1],[4],[17] 4,267,000 [2],[9],[18]     3,157,000 [1],[4],[17]     3,157,000 [1],[4],[17]   4,267,000 [2],[9],[18]                
Cost 5,971,000 [1],[4],[17] 6,790,000 [2],[9],[18]     5,971,000 [1],[4],[17]     5,971,000 [1],[4],[17]   6,790,000 [2],[9],[18]                
Investment, Identifier [Axis]: Dune Group, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 638,000 624,000     638,000     638,000   624,000                
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 102,000 [1],[3],[5],[17],[20] 111,000 [2],[8],[11],[18],[21]     102,000 [1],[3],[5],[17],[20]     102,000 [1],[3],[5],[17],[20]   111,000 [2],[8],[11],[18],[21]                
Cost 110,000 [1],[3],[5],[17],[20] 109,000 [2],[8],[11],[18],[21]     110,000 [1],[3],[5],[17],[20]     110,000 [1],[3],[5],[17],[20]   109,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 1,192,000 [1],[3],[5],[6],[17] 1,209,000 [2],[8],[11],[12],[18]     1,192,000 [1],[3],[5],[6],[17]     1,192,000 [1],[3],[5],[6],[17]   1,209,000 [2],[8],[11],[12],[18]                
Cost 1,213,000 [1],[3],[5],[6],[17] 1,212,000 [2],[8],[11],[12],[18]     1,213,000 [1],[3],[5],[6],[17]     1,213,000 [1],[3],[5],[6],[17]   1,212,000 [2],[8],[11],[12],[18]                
Investment, Identifier [Axis]: Dunlipharder B.V., Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 990,000 [1],[3],[5],[15],[17] 988,000 [2],[8],[11],[16],[18]     990,000 [1],[3],[5],[15],[17]     990,000 [1],[3],[5],[15],[17]   988,000 [2],[8],[11],[16],[18]                
Cost 987,000 [1],[3],[5],[15],[17] 986,000 [2],[8],[11],[16],[18]     987,000 [1],[3],[5],[15],[17]     987,000 [1],[3],[5],[15],[17]   986,000 [2],[8],[11],[16],[18]                
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 [1],[3],[5],[15] 14,408,000       14,408,000     14,408,000                    
Cost [1],[3],[5],[15] 14,358,000       14,358,000     14,358,000                    
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[12]   25,287,000               25,287,000                
Cost [2],[8],[11],[12]   25,257,000               25,257,000                
Investment, Identifier [Axis]: EFC International, Automotive, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 241,000       241,000     241,000                    
Cost [1],[5],[13] 231,000       231,000     231,000                    
Investment, Identifier [Axis]: EFC International, Automotive, Senior Unsecured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5] 755,000       755,000     755,000                    
Cost [1],[5] $ 753,000       $ 753,000     $ 753,000                    
Investment, interest rate, paid in kind [1],[5] 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 10,334,000 [1],[3],[5],[6] 12,008,000 [2],[8],[11],[12]     10,334,000 [1],[3],[5],[6]     10,334,000 [1],[3],[5],[6]   12,008,000 [2],[8],[11],[12]                
Cost 12,198,000 [1],[3],[5],[6] 12,272,000 [2],[8],[11],[12]     12,198,000 [1],[3],[5],[6]     12,198,000 [1],[3],[5],[6]   12,272,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 1,640,000 [1],[3],[5],[6] 1,409,000 [2],[8],[11],[12]     1,640,000 [1],[3],[5],[6]     1,640,000 [1],[3],[5],[6]   1,409,000 [2],[8],[11],[12]                
Cost 1,896,000 [1],[3],[5],[6] 1,446,000 [2],[8],[11],[12]     1,896,000 [1],[3],[5],[6]     1,896,000 [1],[3],[5],[6]   1,446,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,026,000 1,471,000     1,026,000     1,026,000   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 5,728,000 [1],[3],[5],[15] 6,024,000 [2],[8],[11],[12]     5,728,000 [1],[3],[5],[15]     5,728,000 [1],[3],[5],[15]   6,024,000 [2],[8],[11],[12]                
Cost 5,960,000 [1],[3],[5],[15] 5,978,000 [2],[8],[11],[12]     5,960,000 [1],[3],[5],[15]     5,960,000 [1],[3],[5],[15]   5,978,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Partnership Equity                                    
Schedule of Investments [Line Items]                                    
Fair value 632,000 [1],[5],[13] 933,000 [2],[11],[14]     632,000 [1],[5],[13]     632,000 [1],[5],[13]   933,000 [2],[11],[14]                
Cost 531,000 [1],[5],[13] 531,000 [2],[11],[14]     531,000 [1],[5],[13]     531,000 [1],[5],[13]   531,000 [2],[11],[14]                
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 9,005,000 [1],[3],[5],[19] 9,100,000 [2],[8],[11],[12]     9,005,000 [1],[3],[5],[19]     9,005,000 [1],[3],[5],[19]   9,100,000 [2],[8],[11],[12]                
Cost 9,328,000 [1],[3],[5],[19] 9,320,000 [2],[8],[11],[12]     9,328,000 [1],[3],[5],[19]     9,328,000 [1],[3],[5],[19]   9,320,000 [2],[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 3,600,000 5,300,000     3,600,000     3,600,000   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 145,830,000 [1],[5] 135,066,000 [2],[11]     145,830,000 [1],[5]     145,830,000 [1],[5]   135,066,000 [2],[11]                
Cost 93,585,000 [1],[5] 93,230,000 [2],[11]     93,585,000 [1],[5]     93,585,000 [1],[5]   93,230,000 [2],[11]                
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 3,636,000 [1],[5],[24] 5,273,000 [2],[11],[27]     3,636,000 [1],[5],[24]     3,636,000 [1],[5],[24]   5,273,000 [2],[11],[27]                
Cost 3,538,000 [1],[5],[24] 5,165,000 [2],[11],[27]     3,538,000 [1],[5],[24]     3,538,000 [1],[5],[24]   5,165,000 [2],[11],[27]                
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 [1],[5] 4,545,000 [2],[11]     4,545,000 [1],[5]     4,545,000 [1],[5]   4,545,000 [2],[11]                
Cost 4,511,000 [1],[5] 4,508,000 [2],[11]     4,511,000 [1],[5]     4,511,000 [1],[5]   4,508,000 [2],[11]                
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, LLC units                                    
Schedule of Investments [Line Items]                                    
Fair value 145,830,000 135,066,000     145,830,000     145,830,000   135,066,000       92,668,000        
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 19,091,000 17,455,000     19,091,000     19,091,000   17,455,000                
Fair value 3,636,000 5,273,000     3,636,000     3,636,000   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 4,520,000 [1],[3],[5],[6] 4,893,000 [2],[8],[11],[12]     4,520,000 [1],[3],[5],[6]     4,520,000 [1],[3],[5],[6]   4,893,000 [2],[8],[11],[12]                
Cost 4,839,000 [1],[3],[5],[6] 4,868,000 [2],[8],[11],[12]     4,839,000 [1],[3],[5],[6]     4,839,000 [1],[3],[5],[6]   4,868,000 [2],[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 5,481,000 [1],[3],[5],[6] 5,529,000 [2],[8],[11],[12]     5,481,000 [1],[3],[5],[6]     5,481,000 [1],[3],[5],[6]   5,529,000 [2],[8],[11],[12]                
Cost 5,451,000 [1],[3],[5],[6] 5,511,000 [2],[8],[11],[12]     5,451,000 [1],[3],[5],[6]     5,451,000 [1],[3],[5],[6]   5,511,000 [2],[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 2,697,000 2,639,000     2,697,000     2,697,000   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 539,000 528,000     539,000     539,000   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 1,332,000 [1],[3],[5],[17],[20] 1,352,000 [2],[8],[11],[18],[21]     1,332,000 [1],[3],[5],[17],[20]     1,332,000 [1],[3],[5],[17],[20]   1,352,000 [2],[8],[11],[18],[21]                
Cost 1,353,000 [1],[3],[5],[17],[20] 1,338,000 [2],[8],[11],[18],[21]     1,353,000 [1],[3],[5],[17],[20]     1,353,000 [1],[3],[5],[17],[20]   1,338,000 [2],[8],[11],[18],[21]                
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 737,000 [1],[3],[5],[15],[17] 745,000 [2],[8],[11],[16],[18]     737,000 [1],[3],[5],[15],[17]     737,000 [1],[3],[5],[15],[17]   745,000 [2],[8],[11],[16],[18]                
Cost 746,000 [1],[3],[5],[15],[17] 745,000 [2],[8],[11],[16],[18]     746,000 [1],[3],[5],[15],[17]     746,000 [1],[3],[5],[15],[17]   745,000 [2],[8],[11],[16],[18]                
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 2,207,000 [1],[3],[5],[17],[32] 2,111,000 [2],[8],[11],[18],[33]     2,207,000 [1],[3],[5],[17],[32]     2,207,000 [1],[3],[5],[17],[32]   2,111,000 [2],[8],[11],[18],[33]                
Cost 2,161,000 [1],[3],[5],[17],[32] 2,158,000 [2],[8],[11],[18],[33]     2,161,000 [1],[3],[5],[17],[32]     2,161,000 [1],[3],[5],[17],[32]   2,158,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[18]   513,000               513,000                
Cost [2],[8],[11],[18]   $ 507,000               $ 507,000                
Investment, interest rate, paid in kind [2],[8],[11],[18]   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 [1],[5],[17] 550,000       550,000     550,000                    
Cost [1],[5],[17] $ 546,000       $ 546,000     $ 546,000                    
Investment, interest rate, paid in kind [1],[5],[17] 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 $ 640,000 $ 640,000     $ 640,000     $ 640,000   $ 640,000                
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,461,000 [1],[3],[5],[17],[47] 1,573,000 [2],[8],[11],[18],[48]     1,461,000 [1],[3],[5],[17],[47]     1,461,000 [1],[3],[5],[17],[47]   1,573,000 [2],[8],[11],[18],[48]                
Cost 1,859,000 [1],[3],[5],[17],[47] 1,853,000 [2],[8],[11],[18],[48]     1,859,000 [1],[3],[5],[17],[47]     1,859,000 [1],[3],[5],[17],[47]   1,853,000 [2],[8],[11],[18],[48]                
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,731,000 [1],[3],[5],[15] 7,106,000 [2],[8],[11],[25]     6,731,000 [1],[3],[5],[15]     6,731,000 [1],[3],[5],[15]   7,106,000 [2],[8],[11],[25]                
Cost 7,067,000 [1],[3],[5],[15] 7,092,000 [2],[8],[11],[25]     7,067,000 [1],[3],[5],[15]     7,067,000 [1],[3],[5],[15]   7,092,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 125,000 [1],[3],[5],[15] 137,000 [2],[8],[11],[25]     125,000 [1],[3],[5],[15]     125,000 [1],[3],[5],[15]   137,000 [2],[8],[11],[25]                
Cost 137,000 [1],[3],[5],[15] 136,000 [2],[8],[11],[25]     137,000 [1],[3],[5],[15]     137,000 [1],[3],[5],[15]   136,000 [2],[8],[11],[25]                
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 231,000 246,000     231,000     231,000   246,000                
Investment, Identifier [Axis]: F24 (Stairway BidCo Gmbh), Software Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,670,000 [1],[3],[5],[17],[20] 1,644,000 [2],[8],[11],[18],[21]     1,670,000 [1],[3],[5],[17],[20]     1,670,000 [1],[3],[5],[17],[20]   1,644,000 [2],[8],[11],[18],[21]                
Cost 1,816,000 [1],[3],[5],[17],[20] 1,792,000 [2],[8],[11],[18],[21]     1,816,000 [1],[3],[5],[17],[20]     1,816,000 [1],[3],[5],[17],[20]   1,792,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,776,000 [1],[3],[5],[24] 6,767,000 [2],[8],[11],[27]     4,776,000 [1],[3],[5],[24]     4,776,000 [1],[3],[5],[24]   6,767,000 [2],[8],[11],[27]                
Cost 4,739,000 [1],[3],[5],[24] 6,728,000 [2],[8],[11],[27]     4,739,000 [1],[3],[5],[24]     4,739,000 [1],[3],[5],[24]   6,728,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Interest                                    
Schedule of Investments [Line Items]                                    
Fair value 17,000 [1],[5],[13] 17,000 [2],[11],[14]     17,000 [1],[5],[13]     17,000 [1],[5],[13]   17,000 [2],[11],[14]                
Cost 12,000 [1],[5],[13] 12,000 [2],[11],[14]     12,000 [1],[5],[13]     12,000 [1],[5],[13]   12,000 [2],[11],[14]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Units                                    
Schedule of Investments [Line Items]                                    
Fair value 73,000 [1],[5],[13] 75,000 [2],[11],[14]     73,000 [1],[5],[13]     73,000 [1],[5],[13]   75,000 [2],[11],[14]                
Cost 51,000 [1],[5],[13] 51,000 [2],[11],[14]     51,000 [1],[5],[13]     51,000 [1],[5],[13]   51,000 [2],[11],[14]                
Investment, Identifier [Axis]: Faraday, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 978,000 0     978,000     978,000   0                
Investment, Identifier [Axis]: Faraday, Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[20] 1,599,000       1,599,000     1,599,000                    
Cost [1],[3],[5],[17],[20] 1,587,000       1,587,000     1,587,000                    
Investment, Identifier [Axis]: Ferrellgas L.P., Oil & Gas Equipment & Services, Opco Preferred Units                                    
Schedule of Investments [Line Items]                                    
Fair value 2,597,000 [1],[5] 2,742,000 [2],[11]     2,597,000 [1],[5]     2,597,000 [1],[5]   2,742,000 [2],[11]                
Cost 2,799,000 [1],[5] 2,799,000 [2],[11]     2,799,000 [1],[5]     2,799,000 [1],[5]   2,799,000 [2],[11]                
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings Inc., Business Equipment & Services, Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 6,494,000 [1],[5] 6,084,000 [2],[11]     6,494,000 [1],[5]     6,494,000 [1],[5]   6,084,000 [2],[11]                
Cost $ 8,338,000 [1],[5] $ 7,892,000 [2],[11]     $ 8,338,000 [1],[5]     $ 8,338,000 [1],[5]   $ 7,892,000 [2],[11]                
Investment, interest rate, paid in kind 11.00% [1],[5] 11.00% [2],[11]     11.00% [1],[5]     11.00% [1],[5]   11.00% [2],[11]                
Investment, Identifier [Axis]: Fineline Technologies, Inc., Consumer Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value $ 1,266,000 [1],[3],[5],[15] $ 1,270,000 [2],[8],[11],[12]     $ 1,266,000 [1],[3],[5],[15]     $ 1,266,000 [1],[3],[5],[15]   $ 1,270,000 [2],[8],[11],[12]                
Cost 1,268,000 [1],[3],[5],[15] 1,274,000 [2],[8],[11],[12]     1,268,000 [1],[3],[5],[15]     1,268,000 [1],[3],[5],[15]   1,274,000 [2],[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 4,154,000 [1],[3],[5],[17],[30] 2,329,000 [2],[8],[11],[18],[31]     4,154,000 [1],[3],[5],[17],[30]     4,154,000 [1],[3],[5],[17],[30]   2,329,000 [2],[8],[11],[18],[31]                
Cost 4,157,000 [1],[3],[5],[17],[30] 2,379,000 [2],[8],[11],[18],[31]     4,157,000 [1],[3],[5],[17],[30]     4,157,000 [1],[3],[5],[17],[30]   2,379,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Finexvet, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 642,000 0     642,000     642,000   0                
Investment, Identifier [Axis]: FitzMark Buyer, LLC, Cargo & Transportation, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,151,000 [1],[3],[5],[6] 4,165,000 [2],[8],[11],[12]     4,151,000 [1],[3],[5],[6]     4,151,000 [1],[3],[5],[6]   4,165,000 [2],[8],[11],[12]                
Cost 4,142,000 [1],[3],[5],[6] 4,164,000 [2],[8],[11],[12]     4,142,000 [1],[3],[5],[6]     4,142,000 [1],[3],[5],[6]   4,164,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 1,075,000 [1],[5],[13] 962,000 [2],[11],[14]     1,075,000 [1],[5],[13]     1,075,000 [1],[5],[13]   962,000 [2],[11],[14]                
Cost 967,000 [1],[5],[13] 967,000 [2],[11],[14]     967,000 [1],[5],[13]     967,000 [1],[5],[13]   967,000 [2],[11],[14]                
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 13,523,000 [1],[3],[5],[15] 13,295,000 [2],[8],[11],[16]     13,523,000 [1],[3],[5],[15]     13,523,000 [1],[3],[5],[15]   13,295,000 [2],[8],[11],[16]                
Cost 13,447,000 [1],[3],[5],[15] 13,434,000 [2],[8],[11],[16]     13,447,000 [1],[3],[5],[15]     13,447,000 [1],[3],[5],[15]   13,434,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Flexential Issuer, LLC, Information Technology, Structured Secured Note - Class C                                    
Schedule of Investments [Line Items]                                    
Fair value 13,600,000 [1] 13,827,000 [2]     13,600,000 [1]     13,600,000 [1]   13,827,000 [2]                
Cost 14,850,000 [1] 14,839,000 [2]     14,850,000 [1]     14,850,000 [1]   14,839,000 [2]                
Investment, Identifier [Axis]: Flywheel Re Segregated Portfolio 2022-4, Investment Funds, Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 2,938,000 [1],[5],[13],[17] 1,932,000 [2],[11],[14],[18]     2,938,000 [1],[5],[13],[17]     2,938,000 [1],[5],[13],[17]   1,932,000 [2],[11],[14],[18]                
Cost 2,828,000 [1],[5],[13],[17] 1,922,000 [2],[11],[14],[18]     2,828,000 [1],[5],[13],[17]     2,828,000 [1],[5],[13],[17]   1,922,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Footco 40 Limited, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 572,000 766,000     572,000     572,000   766,000                
Investment, Identifier [Axis]: Footco 40 Limited, Media & Entertainment, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,739,000 [1],[3],[5],[17],[32] 1,437,000 [2],[8],[11],[18],[33]     1,739,000 [1],[3],[5],[17],[32]     1,739,000 [1],[3],[5],[17],[32]   1,437,000 [2],[8],[11],[18],[33]                
Cost 1,795,000 [1],[3],[5],[17],[32] 1,561,000 [2],[8],[11],[18],[33]     1,795,000 [1],[3],[5],[17],[32]     1,795,000 [1],[3],[5],[17],[32]   1,561,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 575,000 925,000     575,000     575,000   925,000                
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Other Financial, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,872,000 [1],[3],[5],[24] 1,513,000 [2],[8],[11],[25]     1,872,000 [1],[3],[5],[24]     1,872,000 [1],[3],[5],[24]   1,513,000 [2],[8],[11],[25]                
Cost 1,860,000 [1],[3],[5],[24] 1,516,000 [2],[8],[11],[25]     1,860,000 [1],[3],[5],[24]     1,860,000 [1],[3],[5],[24]   1,516,000 [2],[8],[11],[25]                
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 4,614,000 [1],[3],[5],[6] 4,638,000 [2],[8],[11],[12]     4,614,000 [1],[3],[5],[6]     4,614,000 [1],[3],[5],[6]   4,638,000 [2],[8],[11],[12]                
Cost 4,526,000 [1],[3],[5],[6] 4,491,000 [2],[8],[11],[12]     4,526,000 [1],[3],[5],[6]     4,526,000 [1],[3],[5],[6]   4,491,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 1,132,000 [1],[5],[13] 1,179,000 [2],[11],[14]     1,132,000 [1],[5],[13]     1,132,000 [1],[5],[13]   1,179,000 [2],[11],[14]                
Cost 938,000 [1],[5],[13] 938,000 [2],[11],[14]     938,000 [1],[5],[13]     938,000 [1],[5],[13]   938,000 [2],[11],[14]                
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 43,000 [1],[13] 158,000 [2],[14]     43,000 [1],[13]     43,000 [1],[13]   158,000 [2],[14]                
Cost 370,000 [1],[13] 320,000 [2],[14]     370,000 [1],[13]     370,000 [1],[13]   320,000 [2],[14]                
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,607,000 [1],[3],[5],[6] 4,871,000 [2],[8],[11],[12]     4,607,000 [1],[3],[5],[6]     4,607,000 [1],[3],[5],[6]   4,871,000 [2],[8],[11],[12]                
Cost 4,085,000 [1],[3],[5],[6] 4,089,000 [2],[8],[11],[12]     4,085,000 [1],[3],[5],[6]     4,085,000 [1],[3],[5],[6]   4,089,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[16]   16,271,000               16,271,000                
Cost [2],[8],[11],[16]   16,276,000               16,276,000                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[11],[14]   687,000               687,000                
Cost [2],[11],[14]   687,000               687,000                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[16]   (77,000)               (77,000)                
Cost [2],[8],[11],[16]   (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 [1],[3],[5],[15] 16,258,000       16,258,000     16,258,000                    
Cost [1],[3],[5],[15] 16,225,000       16,225,000     16,225,000                    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 633,000       633,000     633,000                    
Cost [1],[5],[13] 687,000       687,000     687,000                    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] (67,000)       (67,000)     (67,000)                    
Cost [1],[3],[5],[15] (70,000)       (70,000)     (70,000)                    
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, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 334,000 [1],[3],[5],[17],[49] 375,000 [2],[8],[11],[18],[34]     334,000 [1],[3],[5],[17],[49]     334,000 [1],[3],[5],[17],[49]   375,000 [2],[8],[11],[18],[34]                
Cost 445,000 [1],[3],[5],[17],[49] 429,000 [2],[8],[11],[18],[34]     445,000 [1],[3],[5],[17],[49]     445,000 [1],[3],[5],[17],[49]   429,000 [2],[8],[11],[18],[34]                
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Second Lien Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[11],[46]   10,442,000               10,442,000                
Cost [2],[11],[46]   $ 10,587,000               $ 10,587,000                
Investment, interest rate, paid in kind [2],[11],[46]   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 [2],[11],[14],[46]   $ 2,252,000               $ 2,252,000                
Cost [2],[11],[14],[46]   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 [2],[11],[14],[46]   2,158,000               2,158,000                
Cost [2],[11],[14],[46]   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 2,402,000 [1],[3],[5],[17],[39] 2,438,000 [2],[8],[11],[18],[48]     2,402,000 [1],[3],[5],[17],[39]     2,402,000 [1],[3],[5],[17],[39]   2,438,000 [2],[8],[11],[18],[48]                
Cost 2,509,000 [1],[3],[5],[17],[39] 2,502,000 [2],[8],[11],[18],[48]     2,509,000 [1],[3],[5],[17],[39]     2,509,000 [1],[3],[5],[17],[39]   2,502,000 [2],[8],[11],[18],[48]                
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 4,126,000 [1],[3],[5],[17],[50] 4,242,000 [2],[8],[11],[18],[51]     4,126,000 [1],[3],[5],[17],[50]     4,126,000 [1],[3],[5],[17],[50]   4,242,000 [2],[8],[11],[18],[51]                
Cost 4,215,000 [1],[3],[5],[17],[50] 4,202,000 [2],[8],[11],[18],[51]     4,215,000 [1],[3],[5],[17],[50]     4,215,000 [1],[3],[5],[17],[50]   4,202,000 [2],[8],[11],[18],[51]                
Investment, Identifier [Axis]: Global Academic Group Limited, Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 437,000 451,000     437,000     437,000   451,000                
Investment, Identifier [Axis]: Greenhill II BV, Capex Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 119,000 255,000     119,000     119,000   255,000                
Investment, Identifier [Axis]: Greenhill II BV, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 878,000 [1],[3],[5],[17],[20] 716,000 [2],[8],[11],[18],[21]     878,000 [1],[3],[5],[17],[20]     878,000 [1],[3],[5],[17],[20]   716,000 [2],[8],[11],[18],[21]                
Cost 813,000 [1],[3],[5],[17],[20] 672,000 [2],[8],[11],[18],[21]     813,000 [1],[3],[5],[17],[20]     813,000 [1],[3],[5],[17],[20]   672,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Groupe Product Life, Consumer Non-cyclical, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,056,000 [1],[3],[5],[17],[20] 598,000 [2],[8],[11],[18],[21]     1,056,000 [1],[3],[5],[17],[20]     1,056,000 [1],[3],[5],[17],[20]   598,000 [2],[8],[11],[18],[21]                
Cost 1,005,000 [1],[3],[5],[17],[20] 553,000 [2],[8],[11],[18],[21]     1,005,000 [1],[3],[5],[17],[20]     1,005,000 [1],[3],[5],[17],[20]   553,000 [2],[8],[11],[18],[21]                
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 794,000 [1],[3],[24] 772,000 [2],[8],[27]     794,000 [1],[3],[24]     794,000 [1],[3],[24]   772,000 [2],[8],[27]                
Cost 790,000 [1],[3],[24] 797,000 [2],[8],[27]     790,000 [1],[3],[24]     790,000 [1],[3],[24]   797,000 [2],[8],[27]                
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 219,000 223,000     219,000     219,000   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 2,112,000 [1],[3],[5],[17],[47] 2,136,000 [2],[8],[11],[18],[40]     2,112,000 [1],[3],[5],[17],[47]     2,112,000 [1],[3],[5],[17],[47]   2,136,000 [2],[8],[11],[18],[40]                
Cost 2,021,000 [1],[3],[5],[17],[47] 2,016,000 [2],[8],[11],[18],[40]     2,021,000 [1],[3],[5],[17],[47]     2,021,000 [1],[3],[5],[17],[47]   2,016,000 [2],[8],[11],[18],[40]                
Investment, Identifier [Axis]: HEKA Invest, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 568,000 555,000     568,000     568,000   555,000                
Investment, Identifier [Axis]: HEKA Invest, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,991,000 [1],[3],[5],[17],[20] 4,846,000 [2],[8],[11],[18],[21]     4,991,000 [1],[3],[5],[17],[20]     4,991,000 [1],[3],[5],[17],[20]   4,846,000 [2],[8],[11],[18],[21]                
Cost 4,469,000 [1],[3],[5],[17],[20] 4,461,000 [2],[8],[11],[18],[21]     4,469,000 [1],[3],[5],[17],[20]     4,469,000 [1],[3],[5],[17],[20]   4,461,000 [2],[8],[11],[18],[21]                
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 [1],[3],[5],[38] 11,480,000       11,480,000     11,480,000                    
Cost [1],[3],[5],[38] 11,336,000       11,336,000     11,336,000                    
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[3],[5],[38] (18,000) [2],[8],[11],[16]     0 [1],[3],[5],[38]     0 [1],[3],[5],[38]   (18,000) [2],[8],[11],[16]                
Cost (14,000) [1],[3],[5],[38] (18,000) [2],[8],[11],[16]     (14,000) [1],[3],[5],[38]     (14,000) [1],[3],[5],[38]   (18,000) [2],[8],[11],[16]                
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Second Lien Note                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[16]   11,363,000               11,363,000                
Cost [2],[8],[11],[16]   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 5,767,000 [1],[3],[5],[24] 4,928,000 [2],[8],[11],[12]     5,767,000 [1],[3],[5],[24]     5,767,000 [1],[3],[5],[24]   4,928,000 [2],[8],[11],[12]                
Cost 5,807,000 [1],[3],[5],[24] 4,946,000 [2],[8],[11],[12]     5,807,000 [1],[3],[5],[24]     5,807,000 [1],[3],[5],[24]   4,946,000 [2],[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 5,239,000 [1],[3],[5],[24] 5,834,000 [2],[8],[11],[27]     5,239,000 [1],[3],[5],[24]     5,239,000 [1],[3],[5],[24]   5,834,000 [2],[8],[11],[27]                
Cost 5,292,000 [1],[3],[5],[24] 5,832,000 [2],[8],[11],[27]     5,292,000 [1],[3],[5],[24]     5,292,000 [1],[3],[5],[24]   5,832,000 [2],[8],[11],[27]                
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 307,000 313,000     307,000     307,000   313,000                
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 592,000 [1],[3],[5],[17],[39] 598,000 [2],[8],[11],[18],[48]     592,000 [1],[3],[5],[17],[39]     592,000 [1],[3],[5],[17],[39]   598,000 [2],[8],[11],[18],[48]                
Cost 571,000 [1],[3],[5],[17],[39] 569,000 [2],[8],[11],[18],[48]     571,000 [1],[3],[5],[17],[39]     571,000 [1],[3],[5],[17],[39]   569,000 [2],[8],[11],[18],[48]                
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 1,378,000 [1],[5] 1,151,000 [2],[11]     1,378,000 [1],[5]     1,378,000 [1],[5]   1,151,000 [2],[11]                
Cost $ 1,563,000 [1],[5] $ 1,161,000 [2],[11]     $ 1,563,000 [1],[5]     $ 1,563,000 [1],[5]   $ 1,161,000 [2],[11]                
Investment, interest rate, paid in kind 11.00% [1],[5] 11.00% [2],[11]     11.00% [1],[5]     11.00% [1],[5]   11.00% [2],[11]                
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value $ 8,896,000 [1],[5] $ 9,183,000 [2],[11]     $ 8,896,000 [1],[5]     $ 8,896,000 [1],[5]   $ 9,183,000 [2],[11]                
Cost $ 10,059,000 [1],[5] $ 9,238,000 [2],[11]     $ 10,059,000 [1],[5]     $ 10,059,000 [1],[5]   $ 9,238,000 [2],[11]                
Investment, interest rate, paid in kind 11.00% [1],[5] 11.00% [2],[11]     11.00% [1],[5]     11.00% [1],[5]   11.00% [2],[11]                
Investment, Identifier [Axis]: Heartland, LLC, Business Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value $ 13,727,000 [1],[3],[5],[6] $ 13,795,000 [2],[8],[11],[12]     $ 13,727,000 [1],[3],[5],[6]     $ 13,727,000 [1],[3],[5],[6]   $ 13,795,000 [2],[8],[11],[12]                
Cost 13,806,000 [1],[3],[5],[6] 13,884,000 [2],[8],[11],[12]     13,806,000 [1],[3],[5],[6]     13,806,000 [1],[3],[5],[6]   13,884,000 [2],[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 7,282,000 [1],[3],[5],[19] 7,276,000 [2],[8],[11],[27]     7,282,000 [1],[3],[5],[19]     7,282,000 [1],[3],[5],[19]   7,276,000 [2],[8],[11],[27]                
Cost 7,237,000 [1],[3],[5],[19] 7,244,000 [2],[8],[11],[27]     7,237,000 [1],[3],[5],[19]     7,237,000 [1],[3],[5],[19]   7,244,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (24,000) [1],[3],[5],[19] (33,000) [2],[8],[11],[27]     (24,000) [1],[3],[5],[19]     (24,000) [1],[3],[5],[19]   (33,000) [2],[8],[11],[27]                
Cost (39,000) [1],[3],[5],[19] (43,000) [2],[8],[11],[27]     (39,000) [1],[3],[5],[19]     (39,000) [1],[3],[5],[19]   (43,000) [2],[8],[11],[27]                
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 3,278,000 [1],[3],[5],[17],[20] 3,148,000 [2],[8],[11],[18],[21]     3,278,000 [1],[3],[5],[17],[20]     3,278,000 [1],[3],[5],[17],[20]   3,148,000 [2],[8],[11],[18],[21]                
Cost 3,676,000 [1],[3],[5],[17],[20] 3,676,000 [2],[8],[11],[18],[21]     3,676,000 [1],[3],[5],[17],[20]     3,676,000 [1],[3],[5],[17],[20]   3,676,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Holland Acquisition Corp., Energy: Oil & Gas, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[3],[4],[5],[7],[28] 0 [2],[8],[9],[10],[11],[29]     0 [1],[3],[4],[5],[7],[28]     0 [1],[3],[4],[5],[7],[28]   0 [2],[8],[9],[10],[11],[29]                
Cost 0 [1],[3],[4],[5],[7],[28] 0 [2],[8],[9],[10],[11],[29]     0 [1],[3],[4],[5],[7],[28]     0 [1],[3],[4],[5],[7],[28]   0 [2],[8],[9],[10],[11],[29]                
Investment, Identifier [Axis]: Home Care Assistance, LLC, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,457,000 [1],[3],[5],[15] 3,621,000 [2],[8],[11],[25]     3,457,000 [1],[3],[5],[15]     3,457,000 [1],[3],[5],[15]   3,621,000 [2],[8],[11],[25]                
Cost 3,720,000 [1],[3],[5],[15] 3,736,000 [2],[8],[11],[25]     3,720,000 [1],[3],[5],[15]     3,720,000 [1],[3],[5],[15]   3,736,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: Honour Lane Logistics Holdings Limited, Transportation Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,460,000 [1],[3],[5],[17],[38] 7,814,000 [2],[8],[11],[18],[26]     6,460,000 [1],[3],[5],[17],[38]     6,460,000 [1],[3],[5],[17],[38]   7,814,000 [2],[8],[11],[18],[26]                
Cost 6,498,000 [1],[3],[5],[17],[38] 7,781,000 [2],[8],[11],[18],[26]     6,498,000 [1],[3],[5],[17],[38]     6,498,000 [1],[3],[5],[17],[38]   7,781,000 [2],[8],[11],[18],[26]                
Investment, Identifier [Axis]: Hygie 31 Holding, Pharma-ceuticals, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,710,000 [1],[3],[5],[17],[30] 1,665,000 [2],[8],[11],[18],[21]     1,710,000 [1],[3],[5],[17],[30]     1,710,000 [1],[3],[5],[17],[30]   1,665,000 [2],[8],[11],[18],[21]                
Cost 1,501,000 [1],[3],[5],[17],[30] 1,498,000 [2],[8],[11],[18],[21]     1,501,000 [1],[3],[5],[17],[30]     1,501,000 [1],[3],[5],[17],[30]   1,498,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 4,270,000 4,496,000     4,270,000     4,270,000   4,496,000       0        
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 4,270,000 [1],[5],[13] 4,496,000 [2],[11],[14]     4,270,000 [1],[5],[13]     4,270,000 [1],[5],[13]   4,496,000 [2],[11],[14]                
Cost 5,219,000 [1],[5],[13] 5,219,000 [2],[11],[14]     5,219,000 [1],[5],[13]     5,219,000 [1],[5],[13]   5,219,000 [2],[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 [1],[3],[5],[15] 3,917,000 [2],[8],[11],[16]     3,917,000 [1],[3],[5],[15]     3,917,000 [1],[3],[5],[15]   3,917,000 [2],[8],[11],[16]                
Cost 3,707,000 [1],[3],[5],[15] 3,670,000 [2],[8],[11],[16]     3,707,000 [1],[3],[5],[15]     3,707,000 [1],[3],[5],[15]   3,670,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,239,000 [1],[3],[5],[15] 4,098,000 [2],[8],[11],[16]     4,239,000 [1],[3],[5],[15]     4,239,000 [1],[3],[5],[15]   4,098,000 [2],[8],[11],[16]                
Cost 4,239,000 [1],[3],[5],[15] 4,098,000 [2],[8],[11],[16]     4,239,000 [1],[3],[5],[15]     4,239,000 [1],[3],[5],[15]   4,098,000 [2],[8],[11],[16]                
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 4,239,000 4,098,000     4,239,000     4,239,000   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 3,354,000 [1],[3],[5],[19] 3,247,000 [2],[8],[11],[27]     3,354,000 [1],[3],[5],[19]     3,354,000 [1],[3],[5],[19]   3,247,000 [2],[8],[11],[27]                
Cost 3,375,000 [1],[3],[5],[19] 3,388,000 [2],[8],[11],[27]     3,375,000 [1],[3],[5],[19]     3,375,000 [1],[3],[5],[19]   3,388,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: IM Analytics Holding, LLC (d/b/a NVT), Electronic Instruments & Components, Warrants                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[5],[13] 0 [2],[11],[14]     0 [1],[5],[13]     0 [1],[5],[13]   0 [2],[11],[14]                
Cost 0 [1],[5],[13] 0 [2],[11],[14]     0 [1],[5],[13]     0 [1],[5],[13]   0 [2],[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 2,667,000 [1],[3],[5],[17],[20] 2,583,000 [2],[8],[11],[18],[21]     2,667,000 [1],[3],[5],[17],[20]     2,667,000 [1],[3],[5],[17],[20]   2,583,000 [2],[8],[11],[18],[21]                
Cost 2,942,000 [1],[3],[5],[17],[20] 2,938,000 [2],[8],[11],[18],[21]     2,942,000 [1],[3],[5],[17],[20]     2,942,000 [1],[3],[5],[17],[20]   2,938,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: INOS 19-090 GmbH, Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 2,432,000 2,380,000     2,432,000     2,432,000   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 5,057,000 [1],[3],[5],[17],[20] 4,892,000 [2],[8],[11],[18],[21]     5,057,000 [1],[3],[5],[17],[20]     5,057,000 [1],[3],[5],[17],[20]   4,892,000 [2],[8],[11],[18],[21]                
Cost 5,526,000 [1],[3],[5],[17],[20] 5,515,000 [2],[8],[11],[18],[21]     5,526,000 [1],[3],[5],[17],[20]     5,526,000 [1],[3],[5],[17],[20]   5,515,000 [2],[8],[11],[18],[21]                
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 1,232,000 118,000     1,232,000     1,232,000   118,000                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 772,000 [1],[5],[13] 127,000 [2],[11],[14]     772,000 [1],[5],[13]     772,000 [1],[5],[13]   127,000 [2],[11],[14]                
Cost 750,000 [1],[5],[13] 144,000 [2],[11],[14]     750,000 [1],[5],[13]     750,000 [1],[5],[13]   144,000 [2],[11],[14]                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 12,734,000 [1],[3],[5],[15] 703,000 [2],[8],[11],[27]     12,734,000 [1],[3],[5],[15]     12,734,000 [1],[3],[5],[15]   703,000 [2],[8],[11],[27]                
Cost 12,731,000 [1],[3],[5],[15] 700,000 [2],[8],[11],[27]     12,731,000 [1],[3],[5],[15]     12,731,000 [1],[3],[5],[15]   700,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (13,000) [1],[3],[5],[15] 5,000 [2],[8],[11],[27]     (13,000) [1],[3],[5],[15]     (13,000) [1],[3],[5],[15]   5,000 [2],[8],[11],[27]                
Cost (9,000) [1],[3],[5],[15] 4,000 [2],[8],[11],[27]     (9,000) [1],[3],[5],[15]     (9,000) [1],[3],[5],[15]   4,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Infoniqa Holdings GmbH, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,830,000 [1],[3],[5],[17],[30] 2,729,000 [2],[8],[11],[18],[31]     2,830,000 [1],[3],[5],[17],[30]     2,830,000 [1],[3],[5],[17],[30]   2,729,000 [2],[8],[11],[18],[31]                
Cost 2,907,000 [1],[3],[5],[17],[30] 2,902,000 [2],[8],[11],[18],[31]     2,907,000 [1],[3],[5],[17],[30]     2,907,000 [1],[3],[5],[17],[30]   2,902,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[18],[31]   5,495,000               5,495,000                
Cost [2],[8],[11],[18],[31]   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 [1],[3],[5],[17],[30] 6,200,000       6,200,000     6,200,000                    
Cost [1],[3],[5],[17],[30] 6,824,000       6,824,000     6,824,000                    
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[52] 985,000       985,000     985,000                    
Cost [1],[3],[5],[17],[52] 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 262,000 1,261,000     262,000     262,000   1,261,000                
Investment, Identifier [Axis]: Innovative XCessories & Services, LLC, Automotive, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,524,000 [1],[3],[4],[38] 2,277,000 [2],[8],[9],[29]     2,524,000 [1],[3],[4],[38]     2,524,000 [1],[3],[4],[38]   2,277,000 [2],[8],[9],[29]                
Cost 2,854,000 [1],[3],[4],[38] 2,854,000 [2],[8],[9],[29]     2,854,000 [1],[3],[4],[38]     2,854,000 [1],[3],[4],[38]   2,854,000 [2],[8],[9],[29]                
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,331,000 1,310,000     1,331,000     1,331,000   1,310,000                
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 57,000 55,000     57,000     57,000   55,000                
Investment, Identifier [Axis]: Interstellar Group B.V., Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 931,000 [1],[3],[5],[17],[20] 1,239,000 [2],[8],[11],[18],[21]     931,000 [1],[3],[5],[17],[20]     931,000 [1],[3],[5],[17],[20]   1,239,000 [2],[8],[11],[18],[21]                
Cost 866,000 [1],[3],[5],[17],[20] 1,191,000 [2],[8],[11],[18],[21]     866,000 [1],[3],[5],[17],[20]     866,000 [1],[3],[5],[17],[20]   1,191,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Iqor US Inc., Services: Business, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,633,000 [1],[3],[4],[19] 2,658,000 [2],[8],[9],[27]     2,633,000 [1],[3],[4],[19]     2,633,000 [1],[3],[4],[19]   2,658,000 [2],[8],[9],[27]                
Cost 2,697,000 [1],[3],[4],[19] 2,711,000 [2],[8],[9],[27]     2,697,000 [1],[3],[4],[19]     2,697,000 [1],[3],[4],[19]   2,711,000 [2],[8],[9],[27]                
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 0       0     0                    
Cost [1],[5],[13] 0       0     0                    
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 681,000 [1],[3],[4],[5],[15] 553,000 [2],[8],[9],[10],[11],[12]     681,000 [1],[3],[4],[5],[15]     681,000 [1],[3],[4],[5],[15]   553,000 [2],[8],[9],[10],[11],[12]                
Cost 488,000 [1],[3],[4],[5],[15] 1,160,000 [2],[8],[9],[10],[11],[12]     488,000 [1],[3],[4],[5],[15]     488,000 [1],[3],[4],[5],[15]   1,160,000 [2],[8],[9],[10],[11],[12]                
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 761,000 744,000     761,000     761,000   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 4,581,000 [1],[3],[5],[17],[20] 4,436,000 [2],[8],[11],[18],[34]     4,581,000 [1],[3],[5],[17],[20]     4,581,000 [1],[3],[5],[17],[20]   4,436,000 [2],[8],[11],[18],[34]                
Cost 4,052,000 [1],[3],[5],[17],[20] 4,044,000 [2],[8],[11],[18],[34]     4,052,000 [1],[3],[5],[17],[20]     4,052,000 [1],[3],[5],[17],[20]   4,044,000 [2],[8],[11],[18],[34]                
Investment, Identifier [Axis]: Ivanti Software, Inc., High Tech Industries, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,874,000 [1],[3],[4],[6] 3,383,000 [2],[8],[9],[12]     3,874,000 [1],[3],[4],[6]     3,874,000 [1],[3],[4],[6]   3,383,000 [2],[8],[9],[12]                
Cost 5,989,000 [1],[3],[4],[6] 5,989,000 [2],[8],[9],[12]     5,989,000 [1],[3],[4],[6]     5,989,000 [1],[3],[4],[6]   5,989,000 [2],[8],[9],[12]                
Investment, Identifier [Axis]: JF Acquisition, LLC, Automotive, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,708,000 [1],[3],[5],[15] 3,575,000 [2],[8],[11],[27]     3,708,000 [1],[3],[5],[15]     3,708,000 [1],[3],[5],[15]   3,575,000 [2],[8],[11],[27]                
Cost 3,738,000 [1],[3],[5],[15] 3,747,000 [2],[8],[11],[27]     3,738,000 [1],[3],[5],[15]     3,738,000 [1],[3],[5],[15]   3,747,000 [2],[8],[11],[27]                
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 1,157,000 [1],[3],[5],[17],[30] 4,009,000 [2],[8],[11],[18],[31]     1,157,000 [1],[3],[5],[17],[30]     1,157,000 [1],[3],[5],[17],[30]   4,009,000 [2],[8],[11],[18],[31]                
Cost 1,149,000 [1],[3],[5],[17],[30] 4,082,000 [2],[8],[11],[18],[31]     1,149,000 [1],[3],[5],[17],[30]     1,149,000 [1],[3],[5],[17],[30]   4,082,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), Aerospace & Defense, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 6,620,000 [1],[3],[5],[17],[38] 6,592,000 [2],[8],[11],[18],[26]     6,620,000 [1],[3],[5],[17],[38]     6,620,000 [1],[3],[5],[17],[38]   6,592,000 [2],[8],[11],[18],[26]                
Cost 6,587,000 [1],[3],[5],[17],[38] 6,576,000 [2],[8],[11],[18],[26]     6,587,000 [1],[3],[5],[17],[38]     6,587,000 [1],[3],[5],[17],[38]   6,576,000 [2],[8],[11],[18],[26]                
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 [2],[8],[11],[16]   7,617,000               7,617,000                
Cost [2],[8],[11],[16]   7,571,000               7,571,000                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Other Financial, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[16]   (2,000)               (2,000)                
Cost [2],[8],[11],[16]   (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 [2],[11],[46]   2,650,000               2,650,000                
Cost [2],[11],[46]   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 [2]   3,511,000               3,511,000                
Cost [2]   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 [1] 3,305,000       3,305,000     3,305,000                    
Cost [1] 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 [2],[18]   40,088,000               40,088,000                
Cost [2],[18]   35,158,000               35,158,000                
Investment, Identifier [Axis]: Jocassee Partners LLC, Investment Funds & Vehicles, Member Interest                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[17] 41,327,000       41,327,000     41,327,000                    
Cost [1],[17] 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 41,327,000 40,088,000     41,327,000     41,327,000   40,088,000       37,601,000        
Investment, Identifier [Axis]: Jon Bidco Limited, Capex & Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,396,000 1,441,000     1,396,000     1,396,000   1,441,000                
Investment, Identifier [Axis]: Jon Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,390,000 [1],[3],[5],[17],[50] 3,477,000 [2],[8],[11],[18],[51]     3,390,000 [1],[3],[5],[17],[50]     3,390,000 [1],[3],[5],[17],[50]   3,477,000 [2],[8],[11],[18],[51]                
Cost 3,825,000 [1],[3],[5],[17],[50] 3,813,000 [2],[8],[11],[18],[51]     3,825,000 [1],[3],[5],[17],[50]     3,825,000 [1],[3],[5],[17],[50]   3,813,000 [2],[8],[11],[18],[51]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,701,000 [1],[3],[5],[6] 2,745,000 [2],[8],[11],[12]     2,701,000 [1],[3],[5],[6]     2,701,000 [1],[3],[5],[6]   2,745,000 [2],[8],[11],[12]                
Cost 2,740,000 [1],[3],[5],[6] 2,736,000 [2],[8],[11],[12]     2,740,000 [1],[3],[5],[6]     2,740,000 [1],[3],[5],[6]   2,736,000 [2],[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 [1],[3],[5],[38] 679,000       679,000     679,000                    
Cost [1],[3],[5],[38] 676,000       676,000     676,000                    
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 153,000 [1],[5] 115,000 [2],[11],[14]     153,000 [1],[5]     153,000 [1],[5]   115,000 [2],[11],[14]                
Cost 97,000 [1],[5] 97,000 [2],[11],[14]     97,000 [1],[5]     97,000 [1],[5]   97,000 [2],[11],[14]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (13,000) [1],[3],[5],[6] (6,000) [2],[8],[11],[12]     (13,000) [1],[3],[5],[6]     (13,000) [1],[3],[5],[6]   (6,000) [2],[8],[11],[12]                
Cost (6,000) [1],[3],[5],[6] (7,000) [2],[8],[11],[12]     (6,000) [1],[3],[5],[6]     (6,000) [1],[3],[5],[6]   (7,000) [2],[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 [1],[3],[5],[15] 5,545,000 [2],[8],[11],[29]     5,545,000 [1],[3],[5],[15]     5,545,000 [1],[3],[5],[15]   5,545,000 [2],[8],[11],[29]                
Cost 5,520,000 [1],[3],[5],[15] 5,535,000 [2],[8],[11],[29]     5,520,000 [1],[3],[5],[15]     5,520,000 [1],[3],[5],[15]   5,535,000 [2],[8],[11],[29]                
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, Partnership Equity                                    
Schedule of Investments [Line Items]                                    
Fair value 215,000 [1],[5],[13] 191,000 [2],[11],[14]     215,000 [1],[5],[13]     215,000 [1],[5],[13]   191,000 [2],[11],[14]                
Cost 203,000 [1],[5],[13] 203,000 [2],[11],[14]     203,000 [1],[5],[13]     203,000 [1],[5],[13]   203,000 [2],[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 1,949,000 1,181,000     1,949,000     1,949,000   1,181,000       0        
Investment, Identifier [Axis]: Kemmerer Operations, LLC, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value $ 1,047,000 $ 1,565,000     $ 1,047,000     $ 1,047,000   $ 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 $ 1,949,000 [1],[4],[5],[13] $ 1,181,000 [2],[9],[11],[14]     $ 1,949,000 [1],[4],[5],[13]     $ 1,949,000 [1],[4],[5],[13]   $ 1,181,000 [2],[9],[11],[14]                
Cost 1,589,000 [1],[4],[5],[13] 1,589,000 [2],[9],[11],[14]     1,589,000 [1],[4],[5],[13]     1,589,000 [1],[4],[5],[13]   1,589,000 [2],[9],[11],[14]                
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Metals & Mining, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,047,000 [1],[4],[5] 1,565,000 [2],[9],[11]     1,047,000 [1],[4],[5]     1,047,000 [1],[4],[5]   1,565,000 [2],[9],[11]                
Cost $ 1,047,000 [1],[4],[5] $ 1,565,000 [2],[9],[11]     $ 1,047,000 [1],[4],[5]     $ 1,047,000 [1],[4],[5]   $ 1,565,000 [2],[9],[11]                
Investment, interest rate, paid in kind 15.00% [1],[4],[5] 15.00% [2],[9],[11]     15.00% [1],[4],[5]     15.00% [1],[4],[5]   15.00% [2],[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 $ 7,017,000 [1],[3],[5],[6] $ 7,027,000 [2],[8],[11],[12]     $ 7,017,000 [1],[3],[5],[6]     $ 7,017,000 [1],[3],[5],[6]   $ 7,027,000 [2],[8],[11],[12]                
Cost 7,047,000 [1],[3],[5],[6] 7,071,000 [2],[8],[11],[12]     7,047,000 [1],[3],[5],[6]     7,047,000 [1],[3],[5],[6]   7,071,000 [2],[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 9,109,000 [1],[3],[5],[6] 9,125,000 [2],[8],[11],[12]     9,109,000 [1],[3],[5],[6]     9,109,000 [1],[3],[5],[6]   9,125,000 [2],[8],[11],[12]                
Cost 9,048,000 [1],[3],[5],[6] 9,080,000 [2],[8],[11],[12]     9,048,000 [1],[3],[5],[6]     9,048,000 [1],[3],[5],[6]   9,080,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 593,000 [1],[5],[13] 577,000 [2],[11],[14]     593,000 [1],[5],[13]     593,000 [1],[5],[13]   577,000 [2],[11],[14]                
Cost 638,000 [1],[5],[13] 638,000 [2],[11],[14]     638,000 [1],[5],[13]     638,000 [1],[5],[13]   638,000 [2],[11],[14]                
Investment, Identifier [Axis]: Kona Buyer, LLC, High Tech Industries, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 8,553,000 [1],[3],[5],[15] 8,623,000 [2],[8],[11],[16]     8,553,000 [1],[3],[5],[15]     8,553,000 [1],[3],[5],[15]   8,623,000 [2],[8],[11],[16]                
Cost 8,533,000 [1],[3],[5],[15] 8,615,000 [2],[8],[11],[16]     8,533,000 [1],[3],[5],[15]     8,533,000 [1],[3],[5],[15]   8,615,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Lambir Bidco Limited, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 714,000 1,766,000     714,000     714,000   1,766,000                
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,692,000 [1],[3],[5],[17],[20] 4,397,000 [2],[8],[11],[18],[21]     1,692,000 [1],[3],[5],[17],[20]     1,692,000 [1],[3],[5],[17],[20]   4,397,000 [2],[8],[11],[18],[21]                
Cost 1,863,000 [1],[3],[5],[17],[20] 4,794,000 [2],[8],[11],[18],[21]     1,863,000 [1],[3],[5],[17],[20]     1,863,000 [1],[3],[5],[17],[20]   4,794,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,427,000 [1],[5],[17] 1,409,000 [2],[11],[18]     1,427,000 [1],[5],[17]     1,427,000 [1],[5],[17]   1,409,000 [2],[11],[18]                
Cost $ 1,628,000 [1],[5],[17] $ 1,533,000 [2],[11],[18]     $ 1,628,000 [1],[5],[17]     $ 1,628,000 [1],[5],[17]   $ 1,533,000 [2],[11],[18]                
Investment, interest rate, paid in kind 12.00% [1],[5],[17] 12.00% [2],[11],[18]     12.00% [1],[5],[17]     12.00% [1],[5],[17]   12.00% [2],[11],[18]                
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, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 661,000 [1],[3],[5],[15],[17] 633,000 [2],[8],[11],[18],[26]     661,000 [1],[3],[5],[15],[17]     661,000 [1],[3],[5],[15],[17]   633,000 [2],[8],[11],[18],[26]                
Cost 689,000 [1],[3],[5],[15],[17] 645,000 [2],[8],[11],[18],[26]     689,000 [1],[3],[5],[15],[17]     689,000 [1],[3],[5],[15],[17]   645,000 [2],[8],[11],[18],[26]                
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 34,000 [1],[3],[5],[15],[17] 34,000 [2],[8],[11],[16],[18]     34,000 [1],[3],[5],[15],[17]     34,000 [1],[3],[5],[15],[17]   34,000 [2],[8],[11],[16],[18]                
Cost 35,000 [1],[3],[5],[15],[17] 35,000 [2],[8],[11],[16],[18]     35,000 [1],[3],[5],[15],[17]     35,000 [1],[3],[5],[15],[17]   35,000 [2],[8],[11],[16],[18]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 10,129,000 [1],[3],[5],[6] 10,150,000 [2],[8],[11],[12]     10,129,000 [1],[3],[5],[6]     10,129,000 [1],[3],[5],[6]   10,150,000 [2],[8],[11],[12]                
Cost 10,081,000 [1],[3],[5],[6] 10,119,000 [2],[8],[11],[12]     10,081,000 [1],[3],[5],[6]     10,081,000 [1],[3],[5],[6]   10,119,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 81,000 [1],[5] 65,000 [2],[11],[14]     81,000 [1],[5]     81,000 [1],[5]   65,000 [2],[11],[14]                
Cost 52,000 [1],[5] 52,000 [2],[11],[14]     52,000 [1],[5]     52,000 [1],[5]   52,000 [2],[11],[14]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (24,000) [1],[3],[5],[6] (32,000) [2],[8],[11],[12]     (24,000) [1],[3],[5],[6]     (24,000) [1],[3],[5],[6]   (32,000) [2],[8],[11],[12]                
Cost (35,000) [1],[3],[5],[6] (39,000) [2],[8],[11],[12]     (35,000) [1],[3],[5],[6]     (35,000) [1],[3],[5],[6]   (39,000) [2],[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 103,000 [1],[6] 100,000 [2],[8],[27]     103,000 [1],[6]     103,000 [1],[6]   100,000 [2],[8],[27]                
Cost 94,000 [1],[6] 94,000 [2],[8],[27]     94,000 [1],[6]     94,000 [1],[6]   94,000 [2],[8],[27]                
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 8,551,000 [1],[3],[6] 8,455,000 [2],[12]     8,551,000 [1],[3],[6]     8,551,000 [1],[3],[6]   8,455,000 [2],[12]                
Cost $ 9,570,000 [1],[3],[6] 8,784,000 [2],[12]     $ 9,570,000 [1],[3],[6]     $ 9,570,000 [1],[3],[6]   8,784,000 [2],[12]                
Investment, interest rate, paid in kind [1],[3],[6] 10.00%       10.00%     10.00%                    
Investment, Identifier [Axis]: Legal Solutions Holdings, Business Services, Senior Subordinated Loan                                    
Schedule of Investments [Line Items]                                    
Fair value $ 0 [1],[5],[7],[53] 0 [2],[10],[11],[46]     $ 0 [1],[5],[7],[53]     $ 0 [1],[5],[7],[53]   0 [2],[10],[11],[46]                
Cost $ 10,129,000 [1],[5],[7],[53] $ 10,129,000 [2],[10],[11],[46]     $ 10,129,000 [1],[5],[7],[53]     $ 10,129,000 [1],[5],[7],[53]   $ 10,129,000 [2],[10],[11],[46]                
Investment, interest rate, paid in kind 16.00% [1],[5],[7],[53] 16.00% [2],[10],[11],[46]     16.00% [1],[5],[7],[53]     16.00% [1],[5],[7],[53]   16.00% [2],[10],[11],[46]                
Investment, Identifier [Axis]: Liberty Steel Holdings USA Inc., Industrial Other, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value $ 19,960,000 [1],[3],[5],[15] $ 19,846,000 [2],[8],[11],[25]     $ 19,960,000 [1],[3],[5],[15]     $ 19,960,000 [1],[3],[5],[15]   $ 19,846,000 [2],[8],[11],[25]                
Cost 19,880,000 [1],[3],[5],[15] 19,847,000 [2],[8],[11],[25]     19,880,000 [1],[3],[5],[15]     19,880,000 [1],[3],[5],[15]   19,847,000 [2],[8],[11],[25]                
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 [1],[3],[4],[5],[6] 2,980,000 [2],[8],[9],[11],[12]     2,795,000 [1],[3],[4],[5],[6]     2,795,000 [1],[3],[4],[5],[6]   2,980,000 [2],[8],[9],[11],[12]                
Cost 3,006,000 [1],[3],[4],[5],[6] 3,194,000 [2],[8],[9],[11],[12]     3,006,000 [1],[3],[4],[5],[6]     3,006,000 [1],[3],[4],[5],[6]   3,194,000 [2],[8],[9],[11],[12]                
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (175,000) [1],[3],[4],[5],[6] (168,000) [2],[8],[9],[11],[12]     (175,000) [1],[3],[4],[5],[6]     (175,000) [1],[3],[4],[5],[6]   (168,000) [2],[8],[9],[11],[12]                
Cost 0 [1],[3],[4],[5],[6] 0 [2],[8],[9],[11],[12]     0 [1],[3],[4],[5],[6]     0 [1],[3],[4],[5],[6]   0 [2],[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 855,000 [1],[3],[5],[6] 837,000 [2],[8],[11],[12]     855,000 [1],[3],[5],[6]     855,000 [1],[3],[5],[6]   837,000 [2],[8],[11],[12]                
Cost 856,000 [1],[3],[5],[6] 855,000 [2],[8],[11],[12]     856,000 [1],[3],[5],[6]     856,000 [1],[3],[5],[6]   855,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 138,000 138,000     138,000     138,000   138,000                
Investment, Identifier [Axis]: LogMeIn, Inc., High Tech Industries, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,212,000 [1],[3],[4],[19] 1,253,000 [2],[8],[9],[27]     1,212,000 [1],[3],[4],[19]     1,212,000 [1],[3],[4],[19]   1,253,000 [2],[8],[9],[27]                
Cost 1,932,000 [1],[3],[4],[19] 1,942,000 [2],[8],[9],[27]     1,932,000 [1],[3],[4],[19]     1,932,000 [1],[3],[4],[19]   1,942,000 [2],[8],[9],[27]                
Investment, Identifier [Axis]: Long Term Care Group, Inc., Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,656,000 [1],[3],[5],[19] 7,816,000 [2],[8],[11],[27]     6,656,000 [1],[3],[5],[19]     6,656,000 [1],[3],[5],[19]   7,816,000 [2],[8],[11],[27]                
Cost 7,850,000 [1],[3],[5],[19] 7,897,000 [2],[8],[11],[27]     7,850,000 [1],[3],[5],[19]     7,850,000 [1],[3],[5],[19]   7,897,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,138,000 [1],[3],[5],[6] 4,123,000 [2],[8],[11],[27]     4,138,000 [1],[3],[5],[6]     4,138,000 [1],[3],[5],[6]   4,123,000 [2],[8],[11],[27]                
Cost 4,102,000 [1],[3],[5],[6] 4,096,000 [2],[8],[11],[27]     4,102,000 [1],[3],[5],[6]     4,102,000 [1],[3],[5],[6]   4,096,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 750,000 [1],[5],[13] 781,000 [2],[11],[14]     750,000 [1],[5],[13]     750,000 [1],[5],[13]   781,000 [2],[11],[14]                
Cost 747,000 [1],[5],[13] 747,000 [2],[11],[14]     747,000 [1],[5],[13]     747,000 [1],[5],[13]   747,000 [2],[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 848,000 [1],[3],[5],[19] 835,000 [2],[8],[11],[27]     848,000 [1],[3],[5],[19]     848,000 [1],[3],[5],[19]   835,000 [2],[8],[11],[27]                
Cost 896,000 [1],[3],[5],[19] 897,000 [2],[8],[11],[27]     896,000 [1],[3],[5],[19]     896,000 [1],[3],[5],[19]   897,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction and Building, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 51,000 [1],[5],[13] 54,000 [2],[11],[14]     51,000 [1],[5],[13]     51,000 [1],[5],[13]   54,000 [2],[11],[14]                
Cost 77,000 [1],[5],[13] 77,000 [2],[11],[14]     77,000 [1],[5],[13]     77,000 [1],[5],[13]   77,000 [2],[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 $ 16,881,000 $ 9,675,000     $ 16,881,000     $ 16,881,000   $ 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 [1],[5],[17],[53] 7,149,000 [2],[11],[18],[46]     9,616,000 [1],[5],[17],[53]     9,616,000 [1],[5],[17],[53]   7,149,000 [2],[11],[18],[46]                
Cost $ 9,616,000 [1],[5],[17],[53] 7,149,000 [2],[11],[18],[46]     $ 9,616,000 [1],[5],[17],[53]     $ 9,616,000 [1],[5],[17],[53]   7,149,000 [2],[11],[18],[46]                
Investment, interest rate, paid in kind [1],[5],[17],[53] 1.50%       1.50%     1.50%                    
Investment, Identifier [Axis]: MVC Automotive Group Gmbh, Automotive, Common Equity interest                                    
Schedule of Investments [Line Items]                                    
Fair value $ 16,881,000 [1],[5],[13],[17],[53] 9,675,000 [2],[11],[14],[18],[46]     $ 16,881,000 [1],[5],[13],[17],[53]     $ 16,881,000 [1],[5],[13],[17],[53]   9,675,000 [2],[11],[14],[18],[46]                
Cost 9,553,000 [1],[5],[13],[17],[53] 9,553,000 [2],[11],[14],[18],[46]     9,553,000 [1],[5],[13],[17],[53]     9,553,000 [1],[5],[13],[17],[53]   9,553,000 [2],[11],[14],[18],[46]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, General Partnership Interest                                    
Schedule of Investments [Line Items]                                    
Fair value 36,000 45,000     36,000     36,000   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 36,000 [1],[17],[53] 45,000 [2],[18],[46]     36,000 [1],[17],[53]     36,000 [1],[17],[53]   45,000 [2],[18],[46]                
Cost 210,000 [1],[17],[53] 225,000 [2],[18],[46]     210,000 [1],[17],[53]     210,000 [1],[17],[53]   225,000 [2],[18],[46]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Investment Funds & Vehicles, Limited Partnership Interest                                    
Schedule of Investments [Line Items]                                    
Fair value 1,451,000 [1],[13],[17],[53] 1,793,000 [2],[18],[46]     1,451,000 [1],[13],[17],[53]     1,451,000 [1],[13],[17],[53]   1,793,000 [2],[18],[46]                
Cost 8,319,000 [1],[13],[17],[53] 8,899,000 [2],[18],[46]     8,319,000 [1],[13],[17],[53]     8,319,000 [1],[13],[17],[53]   8,899,000 [2],[18],[46]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Limited Partnership Interest                                    
Schedule of Investments [Line Items]                                    
Fair value 1,451,000 1,793,000     1,451,000     1,451,000   1,793,000       7,376,000        
Investment, Identifier [Axis]: Magnetite XIX, Limited, Multi-Sector Holdings, Subordinated Notes                                    
Schedule of Investments [Line Items]                                    
Fair value 4,540,000 [1],[4],[6],[17] 4,450,000 [2],[9],[18]     4,540,000 [1],[4],[6],[17]     4,540,000 [1],[4],[6],[17]   4,450,000 [2],[9],[18]                
Cost 5,107,000 [1],[4],[6],[17] 5,107,000 [2],[9],[18]     5,107,000 [1],[4],[6],[17]     5,107,000 [1],[4],[6],[17]   5,107,000 [2],[9],[18]                
Investment, Identifier [Axis]: Magnetite XIX, Limited, Multi-Sector Holdings, Subordinated Structured Notes                                    
Schedule of Investments [Line Items]                                    
Fair value 8,003,000 [1],[4],[17] 7,992,000 [2],[9],[18]     8,003,000 [1],[4],[17]     8,003,000 [1],[4],[17]   7,992,000 [2],[9],[18]                
Cost 9,233,000 [1],[4],[17] 9,377,000 [2],[9],[18]     9,233,000 [1],[4],[17]     9,233,000 [1],[4],[17]   9,377,000 [2],[9],[18]                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,878,000 [1],[3],[5],[17],[20] 2,093,000 [2],[8],[11],[18],[31]     1,878,000 [1],[3],[5],[17],[20]     1,878,000 [1],[3],[5],[17],[20]   2,093,000 [2],[8],[11],[18],[31]                
Cost 2,224,000 [1],[3],[5],[17],[20] 2,219,000 [2],[8],[11],[18],[31]     2,224,000 [1],[3],[5],[17],[20]     2,224,000 [1],[3],[5],[17],[20]   2,219,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 22,000 [1],[3],[5],[17],[20] 40,000 [2],[8],[11],[18],[21]     22,000 [1],[3],[5],[17],[20]     22,000 [1],[3],[5],[17],[20]   40,000 [2],[8],[11],[18],[21]                
Cost 42,000 [1],[3],[5],[17],[20] 42,000 [2],[8],[11],[18],[21]     42,000 [1],[3],[5],[17],[20]     42,000 [1],[3],[5],[17],[20]   42,000 [2],[8],[11],[18],[21]                
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 109,000 106,000     109,000     109,000   106,000                
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 10,559,000 [1],[3],[5],[15] 10,794,000 [2],[8],[11],[16]     10,559,000 [1],[3],[5],[15]     10,559,000 [1],[3],[5],[15]   10,794,000 [2],[8],[11],[16]                
Cost 10,719,000 [1],[3],[5],[15] 10,786,000 [2],[8],[11],[16]     10,719,000 [1],[3],[5],[15]     10,719,000 [1],[3],[5],[15]   10,786,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 1,496,000 [1],[3],[5],[15] 1,217,000 [2],[8],[11],[54]     1,496,000 [1],[3],[5],[15]     1,496,000 [1],[3],[5],[15]   1,217,000 [2],[8],[11],[54]                
Cost 1,520,000 [1],[3],[5],[15] 1,215,000 [2],[8],[11],[54]     1,520,000 [1],[3],[5],[15]     1,520,000 [1],[3],[5],[15]   1,215,000 [2],[8],[11],[54]                
Investment, Identifier [Axis]: Marshall Excelsior Co., Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 110,000 413,000     110,000     110,000   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 2,888,000 [1],[3],[5],[15] 2,903,000 [2],[8],[11],[16]     2,888,000 [1],[3],[5],[15]     2,888,000 [1],[3],[5],[15]   2,903,000 [2],[8],[11],[16]                
Cost 2,863,000 [1],[3],[5],[15] 2,872,000 [2],[8],[11],[16]     2,863,000 [1],[3],[5],[15]     2,863,000 [1],[3],[5],[15]   2,872,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 4,102,000 [1],[3],[5],[32] 3,894,000 [2],[8],[11],[43]     4,102,000 [1],[3],[5],[32]     4,102,000 [1],[3],[5],[32]   3,894,000 [2],[8],[11],[43]                
Cost 4,248,000 [1],[3],[5],[32] 4,257,000 [2],[8],[11],[43]     4,248,000 [1],[3],[5],[32]     4,248,000 [1],[3],[5],[32]   4,257,000 [2],[8],[11],[43]                
Investment, Identifier [Axis]: Median B.V., Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 8,420,000 [1],[3],[17],[35] 7,449,000 [2],[8],[18],[33]     8,420,000 [1],[3],[17],[35]     8,420,000 [1],[3],[17],[35]   7,449,000 [2],[8],[18],[33]                
Cost 9,822,000 [1],[3],[17],[35] 9,797,000 [2],[8],[18],[33]     9,822,000 [1],[3],[17],[35]     9,822,000 [1],[3],[17],[35]   9,797,000 [2],[8],[18],[33]                
Investment, Identifier [Axis]: Medical Solutions Parent Holdings, Inc., Healthcare, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,907,000 [1],[3],[15] 4,067,000 [2],[8],[27]     3,907,000 [1],[3],[15]     3,907,000 [1],[3],[15]   4,067,000 [2],[8],[27]                
Cost 4,384,000 [1],[3],[15] 4,382,000 [2],[8],[27]     4,384,000 [1],[3],[15]     4,384,000 [1],[3],[15]   4,382,000 [2],[8],[27]                
Investment, Identifier [Axis]: Mercell Holding AS, Capex Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 733,000 797,000     733,000     733,000   797,000                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class A Units                                    
Schedule of Investments [Line Items]                                    
Fair value 116,000 [1],[5],[13],[17] 116,000 [2],[11],[14],[18]     116,000 [1],[5],[13],[17]     116,000 [1],[5],[13],[17]   116,000 [2],[11],[14],[18]                
Cost 111,000 [1],[5],[13],[17] 111,000 [2],[11],[14],[18]     111,000 [1],[5],[13],[17]     111,000 [1],[5],[13],[17]   111,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class B Units                                    
Schedule of Investments [Line Items]                                    
Fair value 55,000 [1],[5],[13],[17] 0 [2],[11],[14],[18]     55,000 [1],[5],[13],[17]     55,000 [1],[5],[13],[17]   0 [2],[11],[14],[18]                
Cost 0 [1],[5],[13],[17] 0 [2],[11],[14],[18]     0 [1],[5],[13],[17]     0 [1],[5],[13],[17]   0 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,867,000 [1],[3],[5],[17],[55] 3,102,000 [2],[8],[11],[18],[56]     2,867,000 [1],[3],[5],[17],[55]     2,867,000 [1],[3],[5],[17],[55]   3,102,000 [2],[8],[11],[18],[56]                
Cost 3,132,000 [1],[3],[5],[17],[55] 3,124,000 [2],[8],[11],[18],[56]     3,132,000 [1],[3],[5],[17],[55]     3,132,000 [1],[3],[5],[17],[55]   3,124,000 [2],[8],[11],[18],[56]                
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited, Capex Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 951,000 968,000     951,000     951,000   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 7,557,000 [1],[3],[5],[17],[22] 7,634,000 [2],[8],[11],[18],[23]     7,557,000 [1],[3],[5],[17],[22]     7,557,000 [1],[3],[5],[17],[22]   7,634,000 [2],[8],[11],[18],[23]                
Cost 8,345,000 [1],[3],[5],[17],[22] 8,324,000 [2],[8],[11],[18],[23]     8,345,000 [1],[3],[5],[17],[22]     8,345,000 [1],[3],[5],[17],[22]   8,324,000 [2],[8],[11],[18],[23]                
Investment, Identifier [Axis]: Murphy Midco Limited, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 372,000 407,000     372,000     372,000   407,000                
Investment, Identifier [Axis]: Murphy Midco Limited, Media, Diversified & Production, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,271,000 [1],[3],[5],[17],[35] 1,150,000 [2],[8],[11],[18],[36]     1,271,000 [1],[3],[5],[17],[35]     1,271,000 [1],[3],[5],[17],[35]   1,150,000 [2],[8],[11],[18],[36]                
Cost 1,318,000 [1],[3],[5],[17],[35] 1,258,000 [2],[8],[11],[18],[36]     1,318,000 [1],[3],[5],[17],[35]     1,318,000 [1],[3],[5],[17],[35]   1,258,000 [2],[8],[11],[18],[36]                
Investment, Identifier [Axis]: Music Reports, Inc., Media & Entertainment, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,860,000 [1],[3],[5],[24] 6,816,000 [2],[8],[11],[27]     6,860,000 [1],[3],[5],[24]     6,860,000 [1],[3],[5],[24]   6,816,000 [2],[8],[11],[27]                
Cost 6,824,000 [1],[3],[5],[24] 6,810,000 [2],[8],[11],[27]     6,824,000 [1],[3],[5],[24]     6,824,000 [1],[3],[5],[24]   6,810,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: NF Holdco, LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,105,000 0     1,105,000     1,105,000   0                
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] 6,188,000       6,188,000     6,188,000                    
Cost [1],[3],[5],[15] 6,193,000       6,193,000     6,193,000                    
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] (33,000)       (33,000)     (33,000)                    
Cost [1],[3],[5],[15] (32,000)       (32,000)     (32,000)                    
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 4,676,000 [1],[3],[5],[24] 4,697,000 [2],[8],[11],[27]     4,676,000 [1],[3],[5],[24]     4,676,000 [1],[3],[5],[24]   4,697,000 [2],[8],[11],[27]                
Cost 4,671,000 [1],[3],[5],[24] 4,693,000 [2],[8],[11],[27]     4,671,000 [1],[3],[5],[24]     4,671,000 [1],[3],[5],[24]   4,693,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: NPM Investments 28 B.V., Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,136,000 [1],[3],[5],[17],[20] 2,084,000 [2],[8],[11],[18],[21]     2,136,000 [1],[3],[5],[17],[20]     2,136,000 [1],[3],[5],[17],[20]   2,084,000 [2],[8],[11],[18],[21]                
Cost 1,908,000 [1],[3],[5],[17],[20] 1,904,000 [2],[8],[11],[18],[21]     1,908,000 [1],[3],[5],[17],[20]     1,908,000 [1],[3],[5],[17],[20]   1,904,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: NPM Investments 28 BV, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 473,000 463,000     473,000     473,000   463,000                
Investment, Identifier [Axis]: Napa Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 17,058,000 [1],[3],[5],[17],[47] 16,963,000 [2],[8],[11],[18],[40]     17,058,000 [1],[3],[5],[17],[47]     17,058,000 [1],[3],[5],[17],[47]   16,963,000 [2],[8],[11],[18],[40]                
Cost 19,571,000 [1],[3],[5],[17],[47] 19,527,000 [2],[8],[11],[18],[40]     19,571,000 [1],[3],[5],[17],[47]     19,571,000 [1],[3],[5],[17],[47]   19,527,000 [2],[8],[11],[18],[40]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class A Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 515,000 [1],[5],[13] 300,000 [2],[11],[14]     515,000 [1],[5],[13]     515,000 [1],[5],[13]   300,000 [2],[11],[14]                
Cost 459,000 [1],[5],[13] 459,000 [2],[11],[14]     459,000 [1],[5],[13]     459,000 [1],[5],[13]   459,000 [2],[11],[14]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class B Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 55,000 [1],[5],[13] 0 [2],[11],[14]     55,000 [1],[5],[13]     55,000 [1],[5],[13]   0 [2],[11],[14]                
Cost 51,000 [1],[5],[13] 51,000 [2],[11],[14]     51,000 [1],[5],[13]     51,000 [1],[5],[13]   51,000 [2],[11],[14]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 5,527,000 [1],[3],[5],[19] 5,096,000 [2],[8],[11],[12]     5,527,000 [1],[3],[5],[19]     5,527,000 [1],[3],[5],[19]   5,096,000 [2],[8],[11],[12]                
Cost 5,547,000 [1],[3],[5],[19] 5,553,000 [2],[8],[11],[12]     5,547,000 [1],[3],[5],[19]     5,547,000 [1],[3],[5],[19]   5,553,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (22,000) [1],[3],[5],[6] 5,000 [2],[8],[11],[12]     (22,000) [1],[3],[5],[6]     (22,000) [1],[3],[5],[6]   5,000 [2],[8],[11],[12]                
Cost (17,000) [1],[3],[5],[6] 112,000 [2],[8],[11],[12]     (17,000) [1],[3],[5],[6]     (17,000) [1],[3],[5],[6]   112,000 [2],[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 [2],[8],[11],[27]   2,649,000               2,649,000                
Cost [2],[8],[11],[27]   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 2,649,000 [1],[3],[5],[24] 2,918,000 [2],[8],[11],[25]     2,649,000 [1],[3],[5],[24]     2,649,000 [1],[3],[5],[24]   2,918,000 [2],[8],[11],[25]                
Cost 2,660,000 [1],[3],[5],[24] 2,920,000 [2],[8],[11],[25]     2,660,000 [1],[3],[5],[24]     2,660,000 [1],[3],[5],[24]   2,920,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] 2,944,000       2,944,000     2,944,000                    
Cost [1],[3],[5],[15] $ 2,939,000       $ 2,939,000     $ 2,939,000                    
Investment, interest rate, paid in kind [3],[5],[15] 3.50%       3.50%     3.50%                    
Investment, Identifier [Axis]: NeoxCo, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount $ 491,000 0     $ 491,000     $ 491,000   0                
Investment, Identifier [Axis]: NeoxCo, Internet Software & Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[30] 2,051,000       2,051,000     2,051,000                    
Cost [1],[3],[5],[17],[30] 2,037,000       2,037,000     2,037,000                    
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 385,000 443,000     385,000     385,000   443,000                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,686,000 [1],[3],[5],[17],[35] 1,508,000 [2],[8],[11],[18],[36]     1,686,000 [1],[3],[5],[17],[35]     1,686,000 [1],[3],[5],[17],[35]   1,508,000 [2],[8],[11],[18],[36]                
Cost 1,768,000 [1],[3],[5],[17],[35] 1,684,000 [2],[8],[11],[18],[36]     1,768,000 [1],[3],[5],[17],[35]     1,768,000 [1],[3],[5],[17],[35]   1,684,000 [2],[8],[11],[18],[36]                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 97,000 [1],[3],[5],[17],[35] 184,000 [2],[8],[11],[18],[36]     97,000 [1],[3],[5],[17],[35]     97,000 [1],[3],[5],[17],[35]   184,000 [2],[8],[11],[18],[36]                
Cost 99,000 [1],[3],[5],[17],[35] 202,000 [2],[8],[11],[18],[36]     99,000 [1],[3],[5],[17],[35]     99,000 [1],[3],[5],[17],[35]   202,000 [2],[8],[11],[18],[36]                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 97,000 0     97,000     97,000   0                
Investment, Identifier [Axis]: Northstar Recycling, LLC, Environmental Industries, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,440,000 [1],[3],[5],[15] 2,446,000 [2],[8],[11],[12]     2,440,000 [1],[3],[5],[15]     2,440,000 [1],[3],[5],[15]   2,446,000 [2],[8],[11],[12]                
Cost 2,426,000 [1],[3],[5],[15] 2,434,000 [2],[8],[11],[12]     2,426,000 [1],[3],[5],[15]     2,426,000 [1],[3],[5],[15]   2,434,000 [2],[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 3,381,000 [1],[3],[5],[17],[47] 3,406,000 [2],[8],[11],[18],[40]     3,381,000 [1],[3],[5],[17],[47]     3,381,000 [1],[3],[5],[17],[47]   3,406,000 [2],[8],[11],[18],[40]                
Cost 3,672,000 [1],[3],[5],[17],[47] 3,667,000 [2],[8],[11],[18],[40]     3,672,000 [1],[3],[5],[17],[47]     3,672,000 [1],[3],[5],[17],[47]   3,667,000 [2],[8],[11],[18],[40]                
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 457,000 [1],[3],[5],[17],[38] 443,000 [2],[8],[11],[18],[26]     457,000 [1],[3],[5],[17],[38]     457,000 [1],[3],[5],[17],[38]   443,000 [2],[8],[11],[18],[26]                
Cost 451,000 [1],[3],[5],[17],[38] 449,000 [2],[8],[11],[18],[26]     451,000 [1],[3],[5],[17],[38]     451,000 [1],[3],[5],[17],[38]   449,000 [2],[8],[11],[18],[26]                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 5,492,000 [1],[3],[5],[15] 5,501,000 [2],[8],[11],[27]     5,492,000 [1],[3],[5],[15]     5,492,000 [1],[3],[5],[15]   5,501,000 [2],[8],[11],[27]                
Cost 5,467,000 [1],[3],[5],[15] 5,488,000 [2],[8],[11],[27]     5,467,000 [1],[3],[5],[15]     5,467,000 [1],[3],[5],[15]   5,488,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 240,000 [1],[5],[13] 226,000 [2],[11],[14]     240,000 [1],[5],[13]     240,000 [1],[5],[13]   226,000 [2],[11],[14]                
Cost 211,000 [1],[5],[13] 211,000 [2],[11],[14]     211,000 [1],[5],[13]     211,000 [1],[5],[13]   211,000 [2],[11],[14]                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (16,000) [1],[3],[5],[15] (21,000) [2],[8],[11],[27]     (16,000) [1],[3],[5],[15]     (16,000) [1],[3],[5],[15]   (21,000) [2],[8],[11],[27]                
Cost (21,000) [1],[3],[5],[15] (23,000) [2],[8],[11],[27]     (21,000) [1],[3],[5],[15]     (21,000) [1],[3],[5],[15]   (23,000) [2],[8],[11],[27]                
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 3,392,000 [1],[3],[5],[15] 3,567,000 [2],[8],[11],[26]     3,392,000 [1],[3],[5],[15]     3,392,000 [1],[3],[5],[15]   3,567,000 [2],[8],[11],[26]                
Cost 3,535,000 [1],[3],[5],[15] 3,556,000 [2],[8],[11],[26]     3,535,000 [1],[3],[5],[15]     3,535,000 [1],[3],[5],[15]   3,556,000 [2],[8],[11],[26]                
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 902,000 [1],[3],[5],[15] 743,000 [2],[8],[11],[26]     902,000 [1],[3],[5],[15]     902,000 [1],[3],[5],[15]   743,000 [2],[8],[11],[26]                
Cost 957,000 [1],[3],[5],[15] 739,000 [2],[8],[11],[26]     957,000 [1],[3],[5],[15]     957,000 [1],[3],[5],[15]   739,000 [2],[8],[11],[26]                
Investment, Identifier [Axis]: OAC Holdings I Corp, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 391,000 607,000     391,000     391,000   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 3,393,000 [1],[3],[5],[17],[20] 3,310,000 [2],[8],[11],[18],[21]     3,393,000 [1],[3],[5],[17],[20]     3,393,000 [1],[3],[5],[17],[20]   3,310,000 [2],[8],[11],[18],[21]                
Cost 3,679,000 [1],[3],[5],[17],[20] 3,674,000 [2],[8],[11],[18],[21]     3,679,000 [1],[3],[5],[17],[20]     3,679,000 [1],[3],[5],[17],[20]   3,674,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 416,000 187,000     416,000     416,000   187,000                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[12]   2,190,000               2,190,000                
Cost [2],[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 2,212,000 [1],[3],[5],[6] 2,206,000 [2],[8],[11],[16]     2,212,000 [1],[3],[5],[6]     2,212,000 [1],[3],[5],[6]   2,206,000 [2],[8],[11],[16]                
Cost 2,217,000 [1],[3],[5],[6] 2,206,000 [2],[8],[11],[16]     2,217,000 [1],[3],[5],[6]     2,217,000 [1],[3],[5],[6]   2,206,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] 2,227,000       2,227,000     2,227,000                    
Cost [1],[3],[5],[15] 2,206,000       2,206,000     2,206,000                    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 3                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] 4,627,000       4,627,000     4,627,000                    
Cost [1],[3],[5],[15] 4,578,000       4,578,000     4,578,000                    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, LP Units                                    
Schedule of Investments [Line Items]                                    
Fair value 372,000 [1],[5],[13] 221,000 [2],[11],[14]     372,000 [1],[5],[13]     372,000 [1],[5],[13]   221,000 [2],[11],[14]                
Cost 351,000 [1],[5],[13] 208,000 [2],[11],[14]     351,000 [1],[5],[13]     351,000 [1],[5],[13]   208,000 [2],[11],[14]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 15,000 [1],[3],[5],[6] (6,000) [2],[8],[11],[12]     15,000 [1],[3],[5],[6]     15,000 [1],[3],[5],[6]   (6,000) [2],[8],[11],[12]                
Cost 13,000 [1],[3],[5],[6] (3,000) [2],[8],[11],[12]     13,000 [1],[3],[5],[6]     13,000 [1],[3],[5],[6]   (3,000) [2],[8],[11],[12]                
Investment, Identifier [Axis]: Offen Inc., Transportation: Cargo, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,696,000 [1],[4],[5],[38] 3,627,000 [2],[9],[11],[27]     3,696,000 [1],[4],[5],[38]     3,696,000 [1],[4],[5],[38]   3,627,000 [2],[9],[11],[27]                
Cost 3,696,000 [1],[4],[5],[38] 3,702,000 [2],[9],[11],[27]     3,696,000 [1],[4],[5],[38]     3,696,000 [1],[4],[5],[38]   3,702,000 [2],[9],[11],[27]                
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 7,975,000 [1],[3],[5],[15] 5,995,000 [2],[8],[11],[16]     7,975,000 [1],[3],[5],[15]     7,975,000 [1],[3],[5],[15]   5,995,000 [2],[8],[11],[16]                
Cost 8,350,000 [1],[3],[5],[15] 6,098,000 [2],[8],[11],[16]     8,350,000 [1],[3],[5],[15]     8,350,000 [1],[3],[5],[15]   6,098,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Options Technology Ltd., Computer Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,230,000 [1],[3],[5],[6],[17] 2,251,000 [2],[8],[11],[18],[29]     2,230,000 [1],[3],[5],[6],[17]     2,230,000 [1],[3],[5],[6],[17]   2,251,000 [2],[8],[11],[18],[29]                
Cost 2,253,000 [1],[3],[5],[6],[17] 2,266,000 [2],[8],[11],[18],[29]     2,253,000 [1],[3],[5],[6],[17]     2,253,000 [1],[3],[5],[6],[17]   2,266,000 [2],[8],[11],[18],[29]                
Investment, Identifier [Axis]: Oracle Vision Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,910,000 [1],[3],[5],[17],[35] 2,753,000 [2],[8],[11],[18],[36]     2,910,000 [1],[3],[5],[17],[35]     2,910,000 [1],[3],[5],[17],[35]   2,753,000 [2],[8],[11],[18],[36]                
Cost 3,157,000 [1],[3],[5],[17],[35] 3,151,000 [2],[8],[11],[18],[36]     3,157,000 [1],[3],[5],[17],[35]     3,157,000 [1],[3],[5],[17],[35]   3,151,000 [2],[8],[11],[18],[36]                
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 357,000 [1],[3],[5],[17],[20] 342,000 [2],[8],[11],[18],[21]     357,000 [1],[3],[5],[17],[20]     357,000 [1],[3],[5],[17],[20]   342,000 [2],[8],[11],[18],[21]                
Cost 396,000 [1],[3],[5],[17],[20] 395,000 [2],[8],[11],[18],[21]     396,000 [1],[3],[5],[17],[20]     396,000 [1],[3],[5],[17],[20]   395,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 588,000 [1],[3],[5],[6],[17] 577,000 [2],[8],[11],[12],[18]     588,000 [1],[3],[5],[6],[17]     588,000 [1],[3],[5],[6],[17]   577,000 [2],[8],[11],[12],[18]                
Cost 585,000 [1],[3],[5],[6],[17] 584,000 [2],[8],[11],[12],[18]     585,000 [1],[3],[5],[6],[17]     585,000 [1],[3],[5],[6],[17]   584,000 [2],[8],[11],[12],[18]                
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, Class A-2 Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 50,000 [1],[5],[13] 41,000 [2],[11],[14]     50,000 [1],[5],[13]     50,000 [1],[5],[13]   41,000 [2],[11],[14]                
Cost 29,000 [1],[5],[13] 29,000 [2],[11],[14]     29,000 [1],[5],[13]     29,000 [1],[5],[13]   29,000 [2],[11],[14]                
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 9,485,000 [1],[3],[5],[15] 8,172,000 [2],[8],[11],[12]     9,485,000 [1],[3],[5],[15]     9,485,000 [1],[3],[5],[15]   8,172,000 [2],[8],[11],[12]                
Cost 9,388,000 [1],[3],[5],[15] 8,116,000 [2],[8],[11],[12]     9,388,000 [1],[3],[5],[15]     9,388,000 [1],[3],[5],[15]   8,116,000 [2],[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 743,000 727,000     743,000     743,000   727,000                
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 764,000 [1],[3],[5],[17],[20] 829,000 [2],[8],[11],[18],[21]     764,000 [1],[3],[5],[17],[20]     764,000 [1],[3],[5],[17],[20]   829,000 [2],[8],[11],[18],[21]                
Cost 828,000 [1],[3],[5],[17],[20] 825,000 [2],[8],[11],[18],[21]     828,000 [1],[3],[5],[17],[20]     828,000 [1],[3],[5],[17],[20]   825,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 798,000 [1],[3],[5],[6],[17] 842,000 [2],[8],[11],[12],[18]     798,000 [1],[3],[5],[6],[17]     798,000 [1],[3],[5],[6],[17]   842,000 [2],[8],[11],[12],[18]                
Cost 845,000 [1],[3],[5],[6],[17] 844,000 [2],[8],[11],[12],[18]     845,000 [1],[3],[5],[6],[17]     845,000 [1],[3],[5],[6],[17]   844,000 [2],[8],[11],[12],[18]                
Investment, Identifier [Axis]: Panoche Energy Center LLC, Electric, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,358,000 [1],[5] 4,628,000 [2],[11]     4,358,000 [1],[5]     4,358,000 [1],[5]   4,628,000 [2],[11]                
Cost 4,198,000 [1],[5] 4,430,000 [2],[11]     4,198,000 [1],[5]     4,198,000 [1],[5]   4,430,000 [2],[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 2,726,000 [1],[3],[5],[17],[30] 2,638,000 [2],[8],[11],[18],[31]     2,726,000 [1],[3],[5],[17],[30]     2,726,000 [1],[3],[5],[17],[30]   2,638,000 [2],[8],[11],[18],[31]                
Cost 2,822,000 [1],[3],[5],[17],[30] $ 2,807,000 [2],[8],[11],[18],[31]     2,822,000 [1],[3],[5],[17],[30]     2,822,000 [1],[3],[5],[17],[30]   $ 2,807,000 [2],[8],[11],[18],[31]                
Investment, interest rate, paid in kind [2],[8],[11],[18],[31]   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 1,465,000 [1],[3],[5],[15],[17] $ 1,455,000 [2],[8],[11],[16],[18]     1,465,000 [1],[3],[5],[15],[17]     1,465,000 [1],[3],[5],[15],[17]   $ 1,455,000 [2],[8],[11],[16],[18]                
Cost 1,500,000 [1],[3],[5],[15],[17] 1,500,000 [2],[8],[11],[16],[18]     1,500,000 [1],[3],[5],[15],[17]     1,500,000 [1],[3],[5],[15],[17]   1,500,000 [2],[8],[11],[16],[18]                
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 2,405,000 [1],[3],[5],[17],[20] 2,702,000 [2],[8],[11],[18],[21]     2,405,000 [1],[3],[5],[17],[20]     2,405,000 [1],[3],[5],[17],[20]   2,702,000 [2],[8],[11],[18],[21]                
Cost 2,494,000 [1],[3],[5],[17],[20] 2,850,000 [2],[8],[11],[18],[21]     2,494,000 [1],[3],[5],[17],[20]     2,494,000 [1],[3],[5],[17],[20]   2,850,000 [2],[8],[11],[18],[21]                
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 2,934,000 [1],[3],[5],[6],[17] 3,159,000 [2],[8],[11],[12],[18]     2,934,000 [1],[3],[5],[6],[17]     2,934,000 [1],[3],[5],[6],[17]   3,159,000 [2],[8],[11],[12],[18]                
Cost 3,046,000 [1],[3],[5],[6],[17] 3,264,000 [2],[8],[11],[12],[18]     3,046,000 [1],[3],[5],[6],[17]     3,046,000 [1],[3],[5],[6],[17]   3,264,000 [2],[8],[11],[12],[18]                
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 [1],[5],[17] 165,000 [2],[11],[18]     166,000 [1],[5],[17]     166,000 [1],[5],[17]   165,000 [2],[11],[18]                
Cost 182,000 [1],[5],[17] 182,000 [2],[11],[18]     182,000 [1],[5],[17]     182,000 [1],[5],[17]   182,000 [2],[11],[18]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class B                                    
Schedule of Investments [Line Items]                                    
Fair value 165,000 [1],[5],[17] 162,000 [2],[11],[18]     165,000 [1],[5],[17]     165,000 [1],[5],[17]   162,000 [2],[11],[18]                
Cost 182,000 [1],[5],[17] 182,000 [2],[11],[18]     182,000 [1],[5],[17]     182,000 [1],[5],[17]   182,000 [2],[11],[18]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class C                                    
Schedule of Investments [Line Items]                                    
Fair value 158,000 [1],[5],[17] 157,000 [2],[11],[18]     158,000 [1],[5],[17]     158,000 [1],[5],[17]   157,000 [2],[11],[18]                
Cost 182,000 [1],[5],[17] 182,000 [2],[11],[18]     182,000 [1],[5],[17]     182,000 [1],[5],[17]   182,000 [2],[11],[18]                
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 [1],[5],[17] 158,000 [2],[11],[18]     160,000 [1],[5],[17]     160,000 [1],[5],[17]   158,000 [2],[11],[18]                
Cost 182,000 [1],[5],[17] 181,000 [2],[11],[18]     182,000 [1],[5],[17]     182,000 [1],[5],[17]   181,000 [2],[11],[18]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class E                                    
Schedule of Investments [Line Items]                                    
Fair value 7,982,000 [1],[5],[17] 8,154,000 [2],[11],[18]     7,982,000 [1],[5],[17]     7,982,000 [1],[5],[17]   8,154,000 [2],[11],[18]                
Cost 9,274,000 [1],[5],[17] 9,273,000 [2],[11],[18]     9,274,000 [1],[5],[17]     9,274,000 [1],[5],[17]   9,273,000 [2],[11],[18]                
Investment, Identifier [Axis]: Permaconn BidCo Pty Ltd, Tele-communications, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,690,000 [1],[3],[5],[17],[39] 2,728,000 [2],[8],[11],[18],[48]     2,690,000 [1],[3],[5],[17],[39]     2,690,000 [1],[3],[5],[17],[39]   2,728,000 [2],[8],[11],[18],[48]                
Cost 2,870,000 [1],[3],[5],[17],[39] 2,864,000 [2],[8],[11],[18],[48]     2,870,000 [1],[3],[5],[17],[39]     2,870,000 [1],[3],[5],[17],[39]   2,864,000 [2],[8],[11],[18],[48]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,208,000 [1],[3],[5],[15] 1,210,000 [2],[8],[11],[12]     1,208,000 [1],[3],[5],[15]     1,208,000 [1],[3],[5],[15]   1,210,000 [2],[8],[11],[12]                
Cost 1,205,000 [1],[3],[5],[15] 1,209,000 [2],[8],[11],[12]     1,205,000 [1],[3],[5],[15]     1,205,000 [1],[3],[5],[15]   1,209,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 1,059,000 [1],[5],[13] 823,000 [2],[11],[14]     1,059,000 [1],[5],[13]     1,059,000 [1],[5],[13]   823,000 [2],[11],[14]                
Cost 741,000 [1],[5],[13] 741,000 [2],[11],[14]     741,000 [1],[5],[13]     741,000 [1],[5],[13]   741,000 [2],[11],[14]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (7,000) [1],[3],[5],[15] (9,000) [2],[8],[11],[12]     (7,000) [1],[3],[5],[15]     (7,000) [1],[3],[5],[15]   (9,000) [2],[8],[11],[12]                
Cost (8,000) [1],[3],[5],[15] (9,000) [2],[8],[11],[12]     (8,000) [1],[3],[5],[15]     (8,000) [1],[3],[5],[15]   (9,000) [2],[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 49,315,000 [1],[3],[5],[6] 48,490,000 [2],[8],[11],[12]     49,315,000 [1],[3],[5],[6]     49,315,000 [1],[3],[5],[6]   48,490,000 [2],[8],[11],[12]                
Cost $ 49,313,000 [1],[3],[5],[6] $ 48,487,000 [2],[8],[11],[12]     $ 49,313,000 [1],[3],[5],[6]     $ 49,313,000 [1],[3],[5],[6]   $ 48,487,000 [2],[8],[11],[12]                
Investment, interest rate, paid in kind 4.00% [1],[3],[5],[6] 4.00% [2],[8],[11],[12]     4.00% [1],[3],[5],[6]     4.00% [1],[3],[5],[6]   4.00% [2],[8],[11],[12]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class A                                    
Schedule of Investments [Line Items]                                    
Fair value $ 378,000 [1],[5],[13] $ 438,000 [2],[11],[14]     $ 378,000 [1],[5],[13]     $ 378,000 [1],[5],[13]   $ 438,000 [2],[11],[14]                
Cost [1],[5],[13] 0 [2],[11],[14]     [1],[5],[13]     [1],[5],[13]   0 [2],[11],[14]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class B                                    
Schedule of Investments [Line Items]                                    
Fair value 128,000 [1],[5],[13] 148,000 [2],[11],[14]     128,000 [1],[5],[13]     128,000 [1],[5],[13]   148,000 [2],[11],[14]                
Cost [1],[5],[13] 0 [2],[11],[14]     [1],[5],[13]     [1],[5],[13]   0 [2],[11],[14]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class CC                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[5],[13] 0 [2],[11],[14]     0 [1],[5],[13]     0 [1],[5],[13]   0 [2],[11],[14]                
Cost [1],[5],[13] 0 [2],[11],[14]     [1],[5],[13]     [1],[5],[13]   0 [2],[11],[14]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class D                                    
Schedule of Investments [Line Items]                                    
Fair value 36,000 [1],[5],[13] 42,000 [2],[11],[14]     36,000 [1],[5],[13]     36,000 [1],[5],[13]   42,000 [2],[11],[14]                
Cost [1],[5],[13] 0 [2],[11],[14]     [1],[5],[13]     [1],[5],[13]   0 [2],[11],[14]                
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 945,000 [1],[3],[4],[5],[24] 987,000 [2],[8],[9],[11],[27]     945,000 [1],[3],[4],[5],[24]     945,000 [1],[3],[4],[5],[24]   987,000 [2],[8],[9],[11],[27]                
Cost 989,000 [1],[3],[4],[5],[24] 997,000 [2],[8],[9],[11],[27]     989,000 [1],[3],[4],[5],[24]     989,000 [1],[3],[4],[5],[24]   997,000 [2],[8],[9],[11],[27]                
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, Research & Consulting Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 12,488,000 [1],[3],[5],[6] 12,510,000 [2],[8],[11],[12]     12,488,000 [1],[3],[5],[6]     12,488,000 [1],[3],[5],[6]   12,510,000 [2],[8],[11],[12]                
Cost 12,451,000 [1],[3],[5],[6] 12,496,000 [2],[8],[11],[12]     12,451,000 [1],[3],[5],[6]     12,451,000 [1],[3],[5],[6]   12,496,000 [2],[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 5,782,000 [1],[3],[5],[17],[30] 5,656,000 [2],[8],[11],[18],[31]     5,782,000 [1],[3],[5],[17],[30]     5,782,000 [1],[3],[5],[17],[30]   5,656,000 [2],[8],[11],[18],[31]                
Cost 5,820,000 [1],[3],[5],[17],[30] 5,804,000 [2],[8],[11],[18],[31]     5,820,000 [1],[3],[5],[17],[30]     5,820,000 [1],[3],[5],[17],[30]   5,804,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Premium Invest, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 2,946,000 2,882,000     2,946,000     2,946,000   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 2,730,000 [1],[3],[5],[17],[38] 2,719,000 [2],[8],[11],[18],[29]     2,730,000 [1],[3],[5],[17],[38]     2,730,000 [1],[3],[5],[17],[38]   2,719,000 [2],[8],[11],[18],[29]                
Cost 2,724,000 [1],[3],[5],[17],[38] 2,719,000 [2],[8],[11],[18],[29]     2,724,000 [1],[3],[5],[17],[38]     2,724,000 [1],[3],[5],[17],[38]   2,719,000 [2],[8],[11],[18],[29]                
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 5,186,000 [1],[3],[5],[15] 4,907,000 [2],[8],[11],[16]     5,186,000 [1],[3],[5],[15]     5,186,000 [1],[3],[5],[15]   4,907,000 [2],[8],[11],[16]                
Cost 5,489,000 [1],[3],[5],[15] 5,430,000 [2],[8],[11],[16]     5,489,000 [1],[3],[5],[15]     5,489,000 [1],[3],[5],[15]   5,430,000 [2],[8],[11],[16]                
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 [2],[8],[11],[27]   304,000               304,000                
Cost [2],[8],[11],[27]   337,000               337,000                
Investment, Identifier [Axis]: Professional Datasolutions, Inc. (PDI), Application Software, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,761,000 [1],[3],[5],[6] 1,751,000 [2],[8],[11],[12]     1,761,000 [1],[3],[5],[6]     1,761,000 [1],[3],[5],[6]   1,751,000 [2],[8],[11],[12]                
Cost 1,807,000 [1],[3],[5],[6] 1,821,000 [2],[8],[11],[12]     1,807,000 [1],[3],[5],[6]     1,807,000 [1],[3],[5],[6]   1,821,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 81,000 484,000     81,000     81,000   484,000                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 1,615,000 [1],[3],[5],[28] 1,624,000 [2],[8],[11],[29]     1,615,000 [1],[3],[5],[28]     1,615,000 [1],[3],[5],[28]   1,624,000 [2],[8],[11],[29]                
Cost 1,612,000 [1],[3],[5],[28] 1,619,000 [2],[8],[11],[29]     1,612,000 [1],[3],[5],[28]     1,612,000 [1],[3],[5],[28]   1,619,000 [2],[8],[11],[29]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 179,000 [1],[5],[13] 172,000 [2],[11],[14]     179,000 [1],[5],[13]     179,000 [1],[5],[13]   172,000 [2],[11],[14]                
Cost 161,000 [1],[5],[13] 161,000 [2],[11],[14]     161,000 [1],[5],[13]     161,000 [1],[5],[13]   161,000 [2],[11],[14]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 396,000 [1],[3],[5],[28] (7,000) [2],[8],[11],[29]     396,000 [1],[3],[5],[28]     396,000 [1],[3],[5],[28]   (7,000) [2],[8],[11],[29]                
Cost 396,000 [1],[3],[5],[28] (8,000) [2],[8],[11],[29]     396,000 [1],[3],[5],[28]     396,000 [1],[3],[5],[28]   (8,000) [2],[8],[11],[29]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Second Lien Senior Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 72,000 [1],[5] 74,000 [2],[11]     72,000 [1],[5]     72,000 [1],[5]   74,000 [2],[11]                
Cost 81,000 [1],[5] 81,000 [2],[11]     81,000 [1],[5]     81,000 [1],[5]   81,000 [2],[11]                
Investment, Identifier [Axis]: Proppants Holding, LLC, Energy: Oil & Gas, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11],[14]                
Cost 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[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 1,590,000 [1],[3],[5],[17],[30] 1,365,000 [2],[8],[11],[18],[31]     1,590,000 [1],[3],[5],[17],[30]     1,590,000 [1],[3],[5],[17],[30]   1,365,000 [2],[8],[11],[18],[31]                
Cost 1,735,000 [1],[3],[5],[17],[30] 1,569,000 [2],[8],[11],[18],[31]     1,735,000 [1],[3],[5],[17],[30]     1,735,000 [1],[3],[5],[17],[30]   1,569,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 2,060,000 [1],[3],[5],[17],[30] 2,017,000 [2],[8],[11],[18],[31]     2,060,000 [1],[3],[5],[17],[30]     2,060,000 [1],[3],[5],[17],[30]   2,017,000 [2],[8],[11],[18],[31]                
Cost 2,279,000 [1],[3],[5],[17],[30] 2,275,000 [2],[8],[11],[18],[31]     2,279,000 [1],[3],[5],[17],[30]     2,279,000 [1],[3],[5],[17],[30]   2,275,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Protego Bidco B.V., Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 648,000 792,000     648,000     648,000   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 1,786,000 [1],[3],[5],[17],[22] 1,821,000 [2],[8],[11],[18],[23]     1,786,000 [1],[3],[5],[17],[22]     1,786,000 [1],[3],[5],[17],[22]   1,821,000 [2],[8],[11],[18],[23]                
Cost 1,968,000 [1],[3],[5],[17],[22] 1,965,000 [2],[8],[11],[18],[23]     1,968,000 [1],[3],[5],[17],[22]     1,968,000 [1],[3],[5],[17],[22]   1,965,000 [2],[8],[11],[18],[23]                
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 0       0     0                    
Cost [1],[5],[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 [1],[3],[5],[15] 590,000       590,000     590,000                    
Cost [1],[3],[5],[15] 589,000       589,000     589,000                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 152,000       152,000     152,000                    
Cost [1],[5],[13] 144,000       144,000     144,000                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] (7,000)       (7,000)     (7,000)                    
Cost [1],[3],[5],[15] (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 6,775,000 [1],[3],[5],[6],[17] 6,692,000 [2],[8],[11],[12],[18]     6,775,000 [1],[3],[5],[6],[17]     6,775,000 [1],[3],[5],[6],[17]   6,692,000 [2],[8],[11],[12],[18]                
Cost 6,821,000 [1],[3],[5],[6],[17] 6,815,000 [2],[8],[11],[12],[18]     6,821,000 [1],[3],[5],[6],[17]     6,821,000 [1],[3],[5],[6],[17]   6,815,000 [2],[8],[11],[12],[18]                
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 5,835,000 [1],[3],[5],[38] 9,873,000 [2],[8],[11],[16]     5,835,000 [1],[3],[5],[38]     5,835,000 [1],[3],[5],[38]   9,873,000 [2],[8],[11],[16]                
Cost 5,809,000 [1],[3],[5],[38] 9,873,000 [2],[8],[11],[16]     5,809,000 [1],[3],[5],[38]     5,809,000 [1],[3],[5],[38]   9,873,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 69,000 [1],[3],[5],[38] 403,000 [2],[8],[11],[16]     69,000 [1],[3],[5],[38]     69,000 [1],[3],[5],[38]   403,000 [2],[8],[11],[16]                
Cost 61,000 [1],[3],[5],[38] 403,000 [2],[8],[11],[16]     61,000 [1],[3],[5],[38]     61,000 [1],[3],[5],[38]   403,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 12,659,000 [1],[3],[4],[5],[15] 12,658,000 [2],[8],[9],[11],[12]     12,659,000 [1],[3],[4],[5],[15]     12,659,000 [1],[3],[4],[5],[15]   12,658,000 [2],[8],[9],[11],[12]                
Cost 12,658,000 [1],[3],[4],[5],[15] 12,658,000 [2],[8],[9],[11],[12]     12,658,000 [1],[3],[4],[5],[15]     12,658,000 [1],[3],[4],[5],[15]   12,658,000 [2],[8],[9],[11],[12]                
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (25,000) [1],[3],[4],[5],[15] (25,000) [2],[8],[9],[11],[12]     (25,000) [1],[3],[4],[5],[15]     (25,000) [1],[3],[4],[5],[15]   (25,000) [2],[8],[9],[11],[12]                
Cost 0 [1],[3],[4],[5],[15] 0 [2],[8],[9],[11],[12]     0 [1],[3],[4],[5],[15]     0 [1],[3],[4],[5],[15]   0 [2],[8],[9],[11],[12]                
Investment, Identifier [Axis]: RA Outdoors, LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,235,000 1,235,000     1,235,000     1,235,000   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 9,615,000 [1],[3],[5],[30] 9,438,000 [2],[8],[11],[34]     9,615,000 [1],[3],[5],[30]     9,615,000 [1],[3],[5],[30]   9,438,000 [2],[8],[11],[34]                
Cost 9,242,000 [1],[3],[5],[30] 9,245,000 [2],[8],[11],[34]     9,242,000 [1],[3],[5],[30]     9,242,000 [1],[3],[5],[30]   9,245,000 [2],[8],[11],[34]                
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 1,410,000 [1],[3],[5],[19] 1,274,000 [2],[8],[11],[12]     1,410,000 [1],[3],[5],[19]     1,410,000 [1],[3],[5],[19]   1,274,000 [2],[8],[11],[12]                
Cost 1,406,000 [1],[3],[5],[19] 1,264,000 [2],[8],[11],[12]     1,406,000 [1],[3],[5],[19]     1,406,000 [1],[3],[5],[19]   1,264,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: RPX Corporation, Research & Consulting Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,741,000 [1],[3],[5],[15] 7,144,000 [2],[8],[11],[12]     6,741,000 [1],[3],[5],[15]     6,741,000 [1],[3],[5],[15]   7,144,000 [2],[8],[11],[12]                
Cost 6,714,000 [1],[3],[5],[15] 7,174,000 [2],[8],[11],[12]     6,714,000 [1],[3],[5],[15]     6,714,000 [1],[3],[5],[15]   7,174,000 [2],[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 [1],[4],[5],[13] 1,000 [2],[9],[11]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   1,000 [2],[9],[11]                
Cost 4,000 [1],[4],[5],[13] 4,000 [2],[9],[11]     4,000 [1],[4],[5],[13]     4,000 [1],[4],[5],[13]   4,000 [2],[9],[11]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class B Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11],[14]                
Cost 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11],[14]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class C Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[4],[5],[13] 155,000 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   155,000 [2],[9],[11],[14]                
Cost 450,000 [1],[4],[5],[13] 450,000 [2],[9],[11],[14]     450,000 [1],[4],[5],[13]     450,000 [1],[4],[5],[13]   450,000 [2],[9],[11],[14]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11],[14]                
Cost 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[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 8,441,000 [1],[3],[4],[5],[24] 9,761,000 [2],[8],[9],[11],[25]     8,441,000 [1],[3],[4],[5],[24]     8,441,000 [1],[3],[4],[5],[24]   9,761,000 [2],[8],[9],[11],[25]                
Cost 9,145,000 [1],[3],[4],[5],[24] 10,032,000 [2],[8],[9],[11],[25]     9,145,000 [1],[3],[4],[5],[24]     9,145,000 [1],[3],[4],[5],[24]   10,032,000 [2],[8],[9],[11],[25]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 1,758,000 [1],[3],[4],[5],[24] 1,480,000 [2],[8],[9],[11],[25]     1,758,000 [1],[3],[4],[5],[24]     1,758,000 [1],[3],[4],[5],[24]   1,480,000 [2],[8],[9],[11],[25]                
Cost 2,063,000 [1],[3],[4],[5],[24] 1,587,000 [2],[8],[9],[11],[25]     2,063,000 [1],[3],[4],[5],[24]     2,063,000 [1],[3],[4],[5],[24]   1,587,000 [2],[8],[9],[11],[25]                
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 12,761,000 [1],[3],[5],[15] 12,708,000 [2],[8],[11],[16]     12,761,000 [1],[3],[5],[15]     12,761,000 [1],[3],[5],[15]   12,708,000 [2],[8],[11],[16]                
Cost 12,719,000 [1],[3],[5],[15] 12,727,000 [2],[8],[11],[16]     12,719,000 [1],[3],[5],[15]     12,719,000 [1],[3],[5],[15]   12,727,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 572,000 [1],[5],[13] 533,000 [2],[11],[14]     572,000 [1],[5],[13]     572,000 [1],[5],[13]   533,000 [2],[11],[14]                
Cost 533,000 [1],[5],[13] 533,000 [2],[11],[14]     533,000 [1],[5],[13]     533,000 [1],[5],[13]   533,000 [2],[11],[14]                
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 308,000 [1],[3],[5],[15] 238,000 [2],[8],[11],[16]     308,000 [1],[3],[5],[15]     308,000 [1],[3],[5],[15]   238,000 [2],[8],[11],[16]                
Cost 302,000 [1],[3],[5],[15] 239,000 [2],[8],[11],[16]     302,000 [1],[3],[5],[15]     302,000 [1],[3],[5],[15]   239,000 [2],[8],[11],[16]                
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 1,513,000 1,571,000     1,513,000     1,513,000   1,571,000                
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 11,471,000 [1],[3],[5],[15] 11,392,000 [2],[8],[11],[12]     11,471,000 [1],[3],[5],[15]     11,471,000 [1],[3],[5],[15]   11,392,000 [2],[8],[11],[12]                
Cost 11,340,000 [1],[3],[5],[15] 11,379,000 [2],[8],[11],[12]     11,340,000 [1],[3],[5],[15]     11,340,000 [1],[3],[5],[15]   11,379,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, Partnership Equity                                    
Schedule of Investments [Line Items]                                    
Fair value 191,000 [1],[5],[13] 125,000 [2],[11],[14]     191,000 [1],[5],[13]     191,000 [1],[5],[13]   125,000 [2],[11],[14]                
Cost 187,000 [1],[5],[13] 187,000 [2],[11],[14]     187,000 [1],[5],[13]     187,000 [1],[5],[13]   187,000 [2],[11],[14]                
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,189,000 [1],[3],[5],[6] 4,556,000 [2],[8],[11],[12]     4,189,000 [1],[3],[5],[6]     4,189,000 [1],[3],[5],[6]   4,556,000 [2],[8],[11],[12]                
Cost 4,691,000 [1],[3],[5],[6] 4,706,000 [2],[8],[11],[12]     4,691,000 [1],[3],[5],[6]     4,691,000 [1],[3],[5],[6]   4,706,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, Partnership Equity                                    
Schedule of Investments [Line Items]                                    
Fair value 70,000 [1],[5],[13] 152,000 [2],[11],[14]     70,000 [1],[5],[13]     70,000 [1],[5],[13]   152,000 [2],[11],[14]                
Cost 197,000 [1],[5],[13] 197,000 [2],[11],[14]     197,000 [1],[5],[13]     197,000 [1],[5],[13]   197,000 [2],[11],[14]                
Investment, Identifier [Axis]: Rep Seko Merger Sub LLC, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 579,000 725,000     579,000     579,000   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 3,119,000 [1],[3],[4],[6] 4,243,000 [2],[8],[9],[11],[12]     3,119,000 [1],[3],[4],[6]     3,119,000 [1],[3],[4],[6]   4,243,000 [2],[8],[9],[11],[12]                
Cost 5,107,000 [1],[3],[4],[6] 5,107,000 [2],[8],[9],[11],[12]     5,107,000 [1],[3],[4],[6]     5,107,000 [1],[3],[4],[6]   5,107,000 [2],[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 3,898,000 [1],[3],[5],[6] 3,926,000 [2],[8],[11],[12]     3,898,000 [1],[3],[5],[6]     3,898,000 [1],[3],[5],[6]   3,926,000 [2],[8],[11],[12]                
Cost 3,946,000 [1],[3],[5],[6] 3,942,000 [2],[8],[11],[12]     3,946,000 [1],[3],[5],[6]     3,946,000 [1],[3],[5],[6]   3,942,000 [2],[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 [2],[8],[11],[18],[36]   2,840,000               2,840,000                
Cost [2],[8],[11],[18],[36]   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 [1],[5],[17] 14,753,000       14,753,000     14,753,000                    
Cost [1],[5],[17] 13,094,000       13,094,000     13,094,000                    
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Structured Junior Note                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 19,786,000 0     19,786,000     19,786,000   0                
Investment, Identifier [Axis]: Riedel Beheer B.V., Food & Beverage, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,104,000 [1],[3],[5],[17],[20] 2,162,000 [2],[8],[11],[18],[21]     2,104,000 [1],[3],[5],[17],[20]     2,104,000 [1],[3],[5],[17],[20]   2,162,000 [2],[8],[11],[18],[21]                
Cost 2,252,000 [1],[3],[5],[17],[20] 2,248,000 [2],[8],[11],[18],[21]     2,252,000 [1],[3],[5],[17],[20]     2,252,000 [1],[3],[5],[17],[20]   2,248,000 [2],[8],[11],[18],[21]                
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 75,000 0     75,000     75,000   0                
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, Common LP Units                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 75,000       75,000     75,000                    
Cost [1],[5],[13] 0       0     0                    
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, Preferred LP Units                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5] 57,220,000       57,220,000     57,220,000                    
Cost [1],[5] $ 57,220,000       $ 57,220,000     $ 57,220,000                    
Investment, interest rate, paid in kind [1],[5] 6.00%       6.00%     6.00%                    
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 57,220,000 0     57,220,000     57,220,000   0                
Investment, Identifier [Axis]: Royal Buyer, LLC, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,684,000 2,209,000     1,684,000     1,684,000   2,209,000                
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,407,000 [1],[3],[5],[15] 10,808,000 [2],[8],[11],[16]     6,407,000 [1],[3],[5],[15]     6,407,000 [1],[3],[5],[15]   10,808,000 [2],[8],[11],[16]                
Cost 6,381,000 [1],[3],[5],[15] 10,791,000 [2],[8],[11],[16]     6,381,000 [1],[3],[5],[15]     6,381,000 [1],[3],[5],[15]   10,791,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 383,000 [1],[3],[5],[15] 377,000 [2],[8],[11],[16]     383,000 [1],[3],[5],[15]     383,000 [1],[3],[5],[15]   377,000 [2],[8],[11],[16]                
Cost 377,000 [1],[3],[5],[15] 374,000 [2],[8],[11],[16]     377,000 [1],[3],[5],[15]     377,000 [1],[3],[5],[15]   374,000 [2],[8],[11],[16]                
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 9,209,000 [1],[3],[5],[6] 9,238,000 [2],[8],[11],[12]     9,209,000 [1],[3],[5],[6]     9,209,000 [1],[3],[5],[6]   9,238,000 [2],[8],[11],[12]                
Cost 9,397,000 [1],[3],[5],[6] 9,445,000 [2],[8],[11],[12]     9,397,000 [1],[3],[5],[6]     9,397,000 [1],[3],[5],[6]   9,445,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: SBP Holdings LP, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,469,000 0     1,469,000     1,469,000   0                
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] 11,991,000       11,991,000     11,991,000                    
Cost [1],[3],[5],[15] 11,969,000       11,969,000     11,969,000                    
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] (34,000)       (34,000)     (34,000)                    
Cost [1],[3],[5],[15] (36,000)       (36,000)     (36,000)                    
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 6,862,000 [1],[3],[5],[6] 6,376,000 [2],[8],[11],[12]     6,862,000 [1],[3],[5],[6]     6,862,000 [1],[3],[5],[6]   6,376,000 [2],[8],[11],[12]                
Cost 6,816,000 [1],[3],[5],[6] 6,840,000 [2],[8],[11],[12]     6,816,000 [1],[3],[5],[6]     6,816,000 [1],[3],[5],[6]   6,840,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: SMART Financial Operations, LLC, Banking, Finance, Insurance & Real Estate, Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 110,000 [1],[4],[5],[13] 110,000 [2],[9],[11],[14]     110,000 [1],[4],[5],[13]     110,000 [1],[4],[5],[13]   110,000 [2],[9],[11],[14]                
Cost 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[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 10,956,000 [1],[3],[5],[15] 10,951,000 [2],[8],[11],[12]     10,956,000 [1],[3],[5],[15]     10,956,000 [1],[3],[5],[15]   10,951,000 [2],[8],[11],[12]                
Cost 10,990,000 [1],[3],[5],[15] 10,972,000 [2],[8],[11],[12]     10,990,000 [1],[3],[5],[15]     10,990,000 [1],[3],[5],[15]   10,972,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[16]   22,041,000               22,041,000                
Cost [2],[8],[11],[16]   22,046,000               22,046,000                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[11],[14]   516,000               516,000                
Cost [2],[11],[14]   516,000               516,000                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[16]   (50,000)               (50,000)                
Cost [2],[8],[11],[16]   (49,000)               (49,000)                
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 4,929,000 4,664,000     4,929,000     4,929,000   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 2,556,000 [1],[3],[5],[17],[32] 2,383,000 [2],[8],[11],[18],[33]     2,556,000 [1],[3],[5],[17],[32]     2,556,000 [1],[3],[5],[17],[32]   2,383,000 [2],[8],[11],[18],[33]                
Cost 2,581,000 [1],[3],[5],[17],[32] 2,566,000 [2],[8],[11],[18],[33]     2,581,000 [1],[3],[5],[17],[32]     2,581,000 [1],[3],[5],[17],[32]   2,566,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 11,389,000 [1],[3],[5],[6] 11,792,000 [2],[8],[11],[12]     11,389,000 [1],[3],[5],[6]     11,389,000 [1],[3],[5],[6]   11,792,000 [2],[8],[11],[12]                
Cost 11,723,000 [1],[3],[5],[6] 11,762,000 [2],[8],[11],[12]     11,723,000 [1],[3],[5],[6]     11,723,000 [1],[3],[5],[6]   11,762,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, Preferred Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 455,000 [1],[5],[13] 460,000 [2],[11],[14]     455,000 [1],[5],[13]     455,000 [1],[5],[13]   460,000 [2],[11],[14]                
Cost 372,000 [1],[5],[13] 372,000 [2],[11],[14]     372,000 [1],[5],[13]     372,000 [1],[5],[13]   372,000 [2],[11],[14]                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Acquisition Capex Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 732,000 1,751,000     732,000     732,000   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 1,555,000 [1],[3],[5],[17],[30] 1,939,000 [2],[8],[11],[18],[31]     1,555,000 [1],[3],[5],[17],[30]     1,555,000 [1],[3],[5],[17],[30]   1,939,000 [2],[8],[11],[18],[31]                
Cost 1,431,000 [1],[3],[5],[17],[30] 1,784,000 [2],[8],[11],[18],[31]     1,431,000 [1],[3],[5],[17],[30]     1,431,000 [1],[3],[5],[17],[30]   1,784,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 2,619,000 [1],[3],[5],[17],[52] 3,886,000 [2],[8],[11],[18],[57]     2,619,000 [1],[3],[5],[17],[52]     2,619,000 [1],[3],[5],[17],[52]   3,886,000 [2],[8],[11],[18],[57]                
Cost 2,466,000 [1],[3],[5],[17],[52] 3,738,000 [2],[8],[11],[18],[57]     2,466,000 [1],[3],[5],[17],[52]     2,466,000 [1],[3],[5],[17],[52]   3,738,000 [2],[8],[11],[18],[57]                
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 1,790,000 [1],[3],[5],[15] 1,716,000 [2],[8],[11],[16]     1,790,000 [1],[3],[5],[15]     1,790,000 [1],[3],[5],[15]   1,716,000 [2],[8],[11],[16]                
Cost 1,782,000 [1],[3],[5],[15] 1,701,000 [2],[8],[11],[16]     1,782,000 [1],[3],[5],[15]     1,782,000 [1],[3],[5],[15]   1,701,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (3,000) [1],[3],[5],[15] (3,000) [2],[8],[11],[16]     (3,000) [1],[3],[5],[15]     (3,000) [1],[3],[5],[15]   (3,000) [2],[8],[11],[16]                
Cost (5,000) [1],[3],[5],[15] (6,000) [2],[8],[11],[16]     (5,000) [1],[3],[5],[15]     (5,000) [1],[3],[5],[15]   (6,000) [2],[8],[11],[16]                
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 1,011,000 2,270,000     1,011,000     1,011,000   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 2,912,000 [1],[3],[5],[17],[30] 6,310,000 [2],[8],[11],[18],[21]     2,912,000 [1],[3],[5],[17],[30]     2,912,000 [1],[3],[5],[17],[30]   6,310,000 [2],[8],[11],[18],[21]                
Cost 2,761,000 [1],[3],[5],[17],[30] 6,286,000 [2],[8],[11],[18],[21]     2,761,000 [1],[3],[5],[17],[30]     2,761,000 [1],[3],[5],[17],[30]   6,286,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (2,000) [1],[3],[5],[17],[30] (21,000) [2],[8],[11],[18],[21]     (2,000) [1],[3],[5],[17],[30]     (2,000) [1],[3],[5],[17],[30]   (21,000) [2],[8],[11],[18],[21]                
Cost (22,000) [1],[3],[5],[17],[30] (24,000) [2],[8],[11],[18],[21]     (22,000) [1],[3],[5],[17],[30]     (22,000) [1],[3],[5],[17],[30]   (24,000) [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Scout Bidco B.V., Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,053,000 1,030,000     1,053,000     1,053,000   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, 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 $ 484,000 575,000     $ 484,000     $ 484,000   575,000       0        
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series B, Controlled                                    
Schedule of Investments [Line Items]                                    
Fair value 45,270,000 53,728,000     45,270,000     45,270,000   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 $ 10,700,000 $ 10,534,000     $ 10,700,000     $ 10,700,000   $ 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 $ 2,159,000 $ 2,015,000     $ 2,159,000     $ 2,159,000   $ 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 $ 2,182,000 $ 2,134,000     $ 2,182,000     $ 2,182,000   $ 2,134,000                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Bridge Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,172,000 [1],[5],[17],[53] 6,020,000 [2],[11],[18],[46]     6,172,000 [1],[5],[17],[53]     6,172,000 [1],[5],[17],[53]   6,020,000 [2],[11],[18],[46]                
Cost $ 6,172,000 [1],[5],[17],[53] $ 6,020,000 [2],[11],[18],[46]     $ 6,172,000 [1],[5],[17],[53]     $ 6,172,000 [1],[5],[17],[53]   $ 6,020,000 [2],[11],[18],[46]                
Investment, interest rate, paid in kind 5.00% [1],[5],[17],[53] 5.00% [2],[11],[18],[46]     5.00% [1],[5],[17],[53]     5.00% [1],[5],[17],[53]   5.00% [2],[11],[18],[46]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Common Stock Series A                                    
Schedule of Investments [Line Items]                                    
Fair value $ 484,000 [1],[5],[13],[17],[53] $ 575,000 [2],[11],[14],[18],[46]     $ 484,000 [1],[5],[13],[17],[53]     $ 484,000 [1],[5],[13],[17],[53]   $ 575,000 [2],[11],[14],[18],[46]                
Cost 560,000 [1],[5],[13],[17],[53] 560,000 [2],[11],[14],[18],[46]     560,000 [1],[5],[13],[17],[53]     560,000 [1],[5],[13],[17],[53]   560,000 [2],[11],[14],[18],[46]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Common Stock Series B                                    
Schedule of Investments [Line Items]                                    
Fair value 45,270,000 [1],[5],[13],[17],[53] 53,728,000 [2],[11],[14],[18],[46]     45,270,000 [1],[5],[13],[17],[53]     45,270,000 [1],[5],[13],[17],[53]   53,728,000 [2],[11],[14],[18],[46]                
Cost 35,192,000 [1],[5],[13],[17],[53] 35,192,000 [2],[11],[14],[18],[46]     35,192,000 [1],[5],[13],[17],[53]     35,192,000 [1],[5],[13],[17],[53]   35,192,000 [2],[11],[14],[18],[46]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,159,000 [1],[5],[17],[53] 10,534,000 [2],[11],[18],[46]     2,159,000 [1],[5],[17],[53]     2,159,000 [1],[5],[17],[53]   10,534,000 [2],[11],[18],[46]                
Cost $ 2,270,000 [1],[5],[17],[53] $ 10,534,000 [2],[11],[18],[46]     $ 2,270,000 [1],[5],[17],[53]     $ 2,270,000 [1],[5],[17],[53]   $ 10,534,000 [2],[11],[18],[46]                
Investment, interest rate, paid in kind 9.00% [1],[5],[17],[53] 3.10% [2],[11],[18],[46]     9.00% [1],[5],[17],[53]     9.00% [1],[5],[17],[53]   3.10% [2],[11],[18],[46]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Unsecured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value $ 10,700,000 [1],[5],[17],[53] $ 2,015,000 [2],[11],[18],[46]     $ 10,700,000 [1],[5],[17],[53]     $ 10,700,000 [1],[5],[17],[53]   $ 2,015,000 [2],[11],[18],[46]                
Cost $ 10,700,000 [1],[5],[17],[53] $ 2,164,000 [2],[11],[18],[46]     $ 10,700,000 [1],[5],[17],[53]     $ 10,700,000 [1],[5],[17],[53]   $ 2,164,000 [2],[11],[18],[46]                
Investment, interest rate, paid in kind 3.10% [1],[5],[17],[53] 9.00% [2],[11],[18],[46]     3.10% [1],[5],[17],[53]     3.10% [1],[5],[17],[53]   9.00% [2],[11],[18],[46]                
Investment, Identifier [Axis]: Security Holdings B.V., Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount $ 1,091,000 $ 1,067,000     $ 1,091,000     $ 1,091,000   $ 1,067,000                
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 465,000 [1],[3],[5],[17],[30] 348,000 [2],[8],[11],[18],[31]     465,000 [1],[3],[5],[17],[30]     465,000 [1],[3],[5],[17],[30]   348,000 [2],[8],[11],[18],[31]                
Cost 441,000 [1],[3],[5],[17],[30] 331,000 [2],[8],[11],[18],[31]     441,000 [1],[3],[5],[17],[30]     441,000 [1],[3],[5],[17],[30]   331,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 488,000 [1],[3],[5],[17],[30] 479,000 [2],[8],[11],[18],[31]     488,000 [1],[3],[5],[17],[30]     488,000 [1],[3],[5],[17],[30]   479,000 [2],[8],[11],[18],[31]                
Cost 480,000 [1],[3],[5],[17],[30] 479,000 [2],[8],[11],[18],[31]     480,000 [1],[3],[5],[17],[30]     480,000 [1],[3],[5],[17],[30]   479,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 3                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[30] 871,000       871,000     871,000                    
Cost [1],[3],[5],[17],[30] 868,000       868,000     868,000                    
Investment, Identifier [Axis]: Sereni Capital NV, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 694,000 0     694,000     694,000   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 [1],[5],[13] 1,630,000       1,630,000     1,630,000                    
Cost [1],[5],[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 [1],[3],[5],[15] 8,257,000       8,257,000     8,257,000                    
Cost [1],[3],[5],[15] 8,174,000       8,174,000     8,174,000                    
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Super Priority First Out                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[12]   7,148,000               7,148,000                
Cost [2],[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 [2],[8],[12]   1,625,000               1,625,000                
Cost [2],[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 [2],[11],[14],[18]   1,200,000               1,200,000                
Cost [2],[11],[14],[18]   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],[8],[11],[16],[18]   33,720,000               33,720,000                
Cost [2],[8],[11],[16],[18]   33,720,000               33,720,000                
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13],[17] 1,200,000       1,200,000     1,200,000                    
Cost [1],[5],[13],[17] 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 [1],[3],[5],[15],[17] 33,798,000       33,798,000     33,798,000                    
Cost [1],[3],[5],[15],[17] 33,772,000       33,772,000     33,772,000                    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Joint Venture, 89.01% Member Interest                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[9],[18]   37,950,000               37,950,000                
Cost [2],[9],[18]   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 [1],[4],[17] 41,215,000       41,215,000     41,215,000                    
Cost [1],[4],[17] 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 41,215,000 37,950,000     41,215,000     41,215,000   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]: 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 15,369,000 [1],[3],[5],[19] 13,393,000 [2],[8],[11],[27]     15,369,000 [1],[3],[5],[19]     15,369,000 [1],[3],[5],[19]   13,393,000 [2],[8],[11],[27]                
Cost 15,413,000 [1],[3],[5],[19] 13,445,000 [2],[8],[11],[27]     15,413,000 [1],[3],[5],[19]     15,413,000 [1],[3],[5],[19]   13,445,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Smartling, Inc., Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (21,000) [1],[3],[5],[19] (24,000) [2],[8],[11],[27]     (21,000) [1],[3],[5],[19]     (21,000) [1],[3],[5],[19]   (24,000) [2],[8],[11],[27]                
Cost (17,000) [1],[3],[5],[19] (19,000) [2],[8],[11],[27]     (17,000) [1],[3],[5],[19]     (17,000) [1],[3],[5],[19]   (19,000) [2],[8],[11],[27]                
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 4,134,000 [1],[3],[5],[15] 4,196,000 [2],[8],[11],[29]     4,134,000 [1],[3],[5],[15]     4,134,000 [1],[3],[5],[15]   4,196,000 [2],[8],[11],[29]                
Cost 4,502,000 [1],[3],[5],[15] 4,521,000 [2],[8],[11],[29]     4,502,000 [1],[3],[5],[15]     4,502,000 [1],[3],[5],[15]   4,521,000 [2],[8],[11],[29]                
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 559,000 [1],[3],[5],[15] 565,000 [2],[8],[11],[29]     559,000 [1],[3],[5],[15]     559,000 [1],[3],[5],[15]   565,000 [2],[8],[11],[29]                
Cost 606,000 [1],[3],[5],[15] 606,000 [2],[8],[11],[29]     606,000 [1],[3],[5],[15]     606,000 [1],[3],[5],[15]   606,000 [2],[8],[11],[29]                
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 1,192,000 3,383,000     1,192,000     1,192,000   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 8,606,000 [1],[5],[17] 5,616,000 [2],[11],[18]     8,606,000 [1],[5],[17]     8,606,000 [1],[5],[17]   5,616,000 [2],[11],[18]                
Cost $ 7,844,000 [1],[5],[17] $ 5,177,000 [2],[11],[18]     $ 7,844,000 [1],[5],[17]     $ 7,844,000 [1],[5],[17]   $ 5,177,000 [2],[11],[18]                
Investment, interest rate, paid in kind 9.50% [1],[5],[17] 9.50% [2],[11],[18]     9.50% [1],[5],[17]     9.50% [1],[5],[17]   9.50% [2],[11],[18]                
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 [1],[3],[5],[15] 15,231,000       15,231,000     15,231,000                    
Cost [1],[3],[5],[15] 15,201,000       15,201,000     15,201,000                    
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 479,000       479,000     479,000                    
Cost [1],[5],[13] 516,000       516,000     516,000                    
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] 356,000       356,000     356,000                    
Cost [1],[3],[5],[15] 354,000       354,000     354,000                    
Investment, Identifier [Axis]: Sound Point CLO XX, Ltd., Multi-Sector Holdings, Subordinated Structured Notes                                    
Schedule of Investments [Line Items]                                    
Fair value 722,000 [1],[4],[17] 1,192,000 [2],[9],[18]     722,000 [1],[4],[17]     722,000 [1],[4],[17]   1,192,000 [2],[9],[18]                
Cost 2,049,000 [1],[4],[17] 2,205,000 [2],[9],[18]     2,049,000 [1],[4],[17]     2,049,000 [1],[4],[17]   2,205,000 [2],[9],[18]                
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 1,889,000 [1],[3],[5],[15] 1,621,000 [2],[8],[11],[16]     1,889,000 [1],[3],[5],[15]     1,889,000 [1],[3],[5],[15]   1,621,000 [2],[8],[11],[16]                
Cost 1,885,000 [1],[3],[5],[15] 1,623,000 [2],[8],[11],[16]     1,885,000 [1],[3],[5],[15]     1,885,000 [1],[3],[5],[15]   1,623,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 56,000 [1],[3],[5],[58] (4,000) [2],[8],[11],[16]     56,000 [1],[3],[5],[58]     56,000 [1],[3],[5],[58]   (4,000) [2],[8],[11],[16]                
Cost 56,000 [1],[3],[5],[58] (3,000) [2],[8],[11],[16]     56,000 [1],[3],[5],[58]     56,000 [1],[3],[5],[58]   (3,000) [2],[8],[11],[16]                
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 7,500,000 7,500,000     7,500,000     7,500,000   7,500,000                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 5,823,000 [1],[3],[5],[24] 5,754,000 [2],[8],[11],[25]     5,823,000 [1],[3],[5],[24]     5,823,000 [1],[3],[5],[24]   5,754,000 [2],[8],[11],[25]                
Cost 5,776,000 [1],[3],[5],[24] 5,766,000 [2],[8],[11],[25]     5,776,000 [1],[3],[5],[24]     5,776,000 [1],[3],[5],[24]   5,766,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (26,000) [1],[3],[5],[24] (35,000) [2],[8],[11],[25]     (26,000) [1],[3],[5],[24]     (26,000) [1],[3],[5],[24]   (35,000) [2],[8],[11],[25]                
Cost (31,000) [1],[3],[5],[24] (34,000) [2],[8],[11],[25]     (31,000) [1],[3],[5],[24]     (31,000) [1],[3],[5],[24]   (34,000) [2],[8],[11],[25]                
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 20,497,000 [1],[3],[5],[15] 20,510,000 [2],[8],[11],[27]     20,497,000 [1],[3],[5],[15]     20,497,000 [1],[3],[5],[15]   20,510,000 [2],[8],[11],[27]                
Cost 20,585,000 [1],[3],[5],[15] 20,660,000 [2],[8],[11],[27]     20,585,000 [1],[3],[5],[15]     20,585,000 [1],[3],[5],[15]   20,660,000 [2],[8],[11],[27]                
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 2,758,000 [1],[3],[5],[38] 2,763,000 [2],[8],[11],[16]     2,758,000 [1],[3],[5],[38]     2,758,000 [1],[3],[5],[38]   2,763,000 [2],[8],[11],[16]                
Cost 2,755,000 [1],[3],[5],[38] 2,763,000 [2],[8],[11],[16]     2,755,000 [1],[3],[5],[38]     2,755,000 [1],[3],[5],[38]   2,763,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: Starnmeer B.V., Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,484,000 [1],[3],[5],[15],[17] 2,477,000 [2],[8],[11],[12],[18]     2,484,000 [1],[3],[5],[15],[17]     2,484,000 [1],[3],[5],[15],[17]   2,477,000 [2],[8],[11],[12],[18]                
Cost 2,472,000 [1],[3],[5],[15],[17] 2,469,000 [2],[8],[11],[12],[18]     2,472,000 [1],[3],[5],[15],[17]     2,472,000 [1],[3],[5],[15],[17]   2,469,000 [2],[8],[11],[12],[18]                
Investment, Identifier [Axis]: Superjet Buyer, LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,825,000 1,825,000     1,825,000     1,825,000   1,825,000                
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 12,847,000 [1],[3],[5],[15] 12,860,000 [2],[8],[11],[12]     12,847,000 [1],[3],[5],[15]     12,847,000 [1],[3],[5],[15]   12,860,000 [2],[8],[11],[12]                
Cost 12,772,000 [1],[3],[5],[15] 12,818,000 [2],[8],[11],[12]     12,772,000 [1],[3],[5],[15]     12,772,000 [1],[3],[5],[15]   12,818,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (18,000) [1],[3],[5],[15] (26,000) [2],[8],[11],[12]     (18,000) [1],[3],[5],[15]     (18,000) [1],[3],[5],[15]   (26,000) [2],[8],[11],[12]                
Cost (28,000) [1],[3],[5],[15] (31,000) [2],[8],[11],[12]     (28,000) [1],[3],[5],[15]     (28,000) [1],[3],[5],[15]   (31,000) [2],[8],[11],[12]                
Investment, Identifier [Axis]: Syniverse Holdings, Inc., Technology Distributors, Series A Preferred Equity                                    
Schedule of Investments [Line Items]                                    
Fair value 8,219,000 [1],[5] 6,515,000 [2],[11]     8,219,000 [1],[5]     8,219,000 [1],[5]   6,515,000 [2],[11]                
Cost $ 8,451,000 [1],[5] $ 7,945,000 [2],[11]     $ 8,451,000 [1],[5]     $ 8,451,000 [1],[5]   $ 7,945,000 [2],[11]                
Investment, interest rate, paid in kind 12.50% [1],[5] 12.50% [2],[11]     12.50% [1],[5]     12.50% [1],[5]   12.50% [2],[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 1,842,000 [1],[3],[5],[17],[19] 1,812,000 [2],[8],[11],[18],[27]     1,842,000 [1],[3],[5],[17],[19]     1,842,000 [1],[3],[5],[17],[19]   1,812,000 [2],[8],[11],[18],[27]                
Cost 1,989,000 [1],[3],[5],[17],[19] 1,992,000 [2],[8],[11],[18],[27]     1,989,000 [1],[3],[5],[17],[19]     1,989,000 [1],[3],[5],[17],[19]   1,992,000 [2],[8],[11],[18],[27]                
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 632,000 [1],[3],[5],[17],[19] 622,000 [2],[8],[11],[18],[27]     632,000 [1],[3],[5],[17],[19]     632,000 [1],[3],[5],[17],[19]   622,000 [2],[8],[11],[18],[27]                
Cost 667,000 [1],[3],[5],[17],[19] 666,000 [2],[8],[11],[18],[27]     667,000 [1],[3],[5],[17],[19]     667,000 [1],[3],[5],[17],[19]   666,000 [2],[8],[11],[18],[27]                
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 65,000 [1],[5],[13] 60,000 [2],[11],[14]     65,000 [1],[5],[13]     65,000 [1],[5],[13]   60,000 [2],[11],[14]                
Cost 50,000 [1],[5],[13] 50,000 [2],[11],[14]     50,000 [1],[5],[13]     50,000 [1],[5],[13]   50,000 [2],[11],[14]                
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,242,000 [1],[5] 2,110,000 [2],[11]     2,242,000 [1],[5]     2,242,000 [1],[5]   2,110,000 [2],[11]                
Cost $ 2,273,000 [1],[5] $ 2,143,000 [2],[11]     $ 2,273,000 [1],[5]     $ 2,273,000 [1],[5]   $ 2,143,000 [2],[11]                
Investment, interest rate, paid in kind 7.80% [1],[5] 7.80% [2],[11]     7.80% [1],[5]     7.80% [1],[5]   7.80% [2],[11]                
Investment, Identifier [Axis]: TANQUERAY BIDCO LIMITED, Technology. First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[18],[33]   $ 1,557,000               $ 1,557,000                
Cost [2],[8],[11],[18],[33]   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 [2],[8],[11],[18]   11,118,000               11,118,000                
Cost [2],[8],[11],[18]   $ 11,434,000               $ 11,434,000                
Investment, interest rate, paid in kind [2],[8],[11],[18]   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 598,000 [1],[3],[5],[15] 591,000 [2],[8],[11],[16]     598,000 [1],[3],[5],[15]     598,000 [1],[3],[5],[15]   591,000 [2],[8],[11],[16]                
Cost 593,000 [1],[3],[5],[15] 591,000 [2],[8],[11],[16]     593,000 [1],[3],[5],[15]     593,000 [1],[3],[5],[15]   591,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 4,000 [1],[5],[13] 5,000 [2],[11],[14]     4,000 [1],[5],[13]     4,000 [1],[5],[13]   5,000 [2],[11],[14]                
Cost 5,000 [1],[5],[13] 5,000 [2],[11],[14]     5,000 [1],[5],[13]     5,000 [1],[5],[13]   5,000 [2],[11],[14]                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (3,000) [1],[3],[5],[15] (4,000) [2],[8],[11],[16]     (3,000) [1],[3],[5],[15]     (3,000) [1],[3],[5],[15]   (4,000) [2],[8],[11],[16]                
Cost (3,000) [1],[3],[5],[15] (4,000) [2],[8],[11],[16]     (3,000) [1],[3],[5],[15]     (3,000) [1],[3],[5],[15]   (4,000) [2],[8],[11],[16]                
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 [2],[8],[11],[25]   10,877,000               10,877,000                
Cost [2],[8],[11],[25]   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 [1],[3],[5],[24] 7,687,000       7,687,000     7,687,000                    
Cost [1],[3],[5],[24] 7,867,000       7,867,000     7,867,000                    
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[24] 2,061,000       2,061,000     2,061,000                    
Cost [1],[3],[5],[24] 2,062,000       2,062,000     2,062,000                    
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 619,000 [1],[3],[5],[24] 157,000 [2],[8],[11],[25]     619,000 [1],[3],[5],[24]     619,000 [1],[3],[5],[24]   157,000 [2],[8],[11],[25]                
Cost 639,000 [1],[3],[5],[24] 157,000 [2],[8],[11],[25]     639,000 [1],[3],[5],[24]     639,000 [1],[3],[5],[24]   157,000 [2],[8],[11],[25]                
Investment, Identifier [Axis]: Tank Holding Corp, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 218,000 698,000     218,000     218,000   698,000                
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Capex Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,150,000 1,088,000     1,150,000     1,150,000   1,088,000                
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Technology. First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[32] 1,663,000       1,663,000     1,663,000                    
Cost [1],[3],[5],[17],[32] 1,494,000       1,494,000     1,494,000                    
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Partnership Equity                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 392,000       392,000     392,000                    
Cost [1],[5],[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 [1],[5] 588,000       588,000     588,000                    
Cost [1],[5] 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 11,633,000 [1],[3],[4],[5],[6] 11,970,000 [2],[8],[9],[11],[12]     11,633,000 [1],[3],[4],[5],[6]     11,633,000 [1],[3],[4],[5],[6]   11,970,000 [2],[8],[9],[11],[12]                
Cost 11,715,000 [1],[3],[4],[5],[6] 12,104,000 [2],[8],[9],[11],[12]     11,715,000 [1],[3],[4],[5],[6]     11,715,000 [1],[3],[4],[5],[6]   12,104,000 [2],[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 9,461,000 [1],[3],[4],[6] 9,345,000 [2],[8],[9],[11],[29]     9,461,000 [1],[3],[4],[6]     9,461,000 [1],[3],[4],[6]   9,345,000 [2],[8],[9],[11],[29]                
Cost 9,787,000 [1],[3],[4],[6] 9,837,000 [2],[8],[9],[11],[29]     9,787,000 [1],[3],[4],[6]     9,787,000 [1],[3],[4],[6]   9,837,000 [2],[8],[9],[11],[29]                
Investment, Identifier [Axis]: Team Services Group, Services: Consumer, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,650,000 [1],[3],[4],[6] 4,700,000 [2],[8],[9],[11],[29]     4,650,000 [1],[3],[4],[6]     4,650,000 [1],[3],[4],[6]   4,700,000 [2],[8],[9],[11],[29]                
Cost 4,975,000 [1],[3],[4],[6] 4,975,000 [2],[8],[9],[11],[29]     4,975,000 [1],[3],[4],[6]     4,975,000 [1],[3],[4],[6]   4,975,000 [2],[8],[9],[11],[29]                
Investment, Identifier [Axis]: Techone B.V., Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 311,000 203,000     311,000     311,000   203,000                
Investment, Identifier [Axis]: Techone B.V., Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,749,000 [1],[3],[5],[17],[20] 3,578,000 [2],[8],[11],[18],[21]     3,749,000 [1],[3],[5],[17],[20]     3,749,000 [1],[3],[5],[17],[20]   3,578,000 [2],[8],[11],[18],[21]                
Cost 3,794,000 [1],[3],[5],[17],[20] 3,788,000 [2],[8],[11],[18],[21]     3,794,000 [1],[3],[5],[17],[20]     3,794,000 [1],[3],[5],[17],[20]   3,788,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Techone B.V., Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 196,000 [1],[3],[5],[17],[20] 281,000 [2],[8],[11],[18],[21]     196,000 [1],[3],[5],[17],[20]     196,000 [1],[3],[5],[17],[20]   281,000 [2],[8],[11],[18],[21]                
Cost 189,000 [1],[3],[5],[17],[20] 296,000 [2],[8],[11],[18],[21]     189,000 [1],[3],[5],[17],[20]     189,000 [1],[3],[5],[17],[20]   296,000 [2],[8],[11],[18],[21]                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[28] 6,227,000       6,227,000     6,227,000                    
Cost [1],[3],[5],[28] 6,195,000       6,195,000     6,195,000                    
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[12]   871,000               871,000                
Cost [2],[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 [2],[8],[11],[12]   5,368,000               5,368,000                
Cost [2],[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 (10,000) [1],[3],[5],[28] (13,000) [2],[8],[11],[12]     (10,000) [1],[3],[5],[28]     (10,000) [1],[3],[5],[28]   (13,000) [2],[8],[11],[12]                
Cost (15,000) [1],[3],[5],[28] (16,000) [2],[8],[11],[12]     (15,000) [1],[3],[5],[28]     (15,000) [1],[3],[5],[28]   (16,000) [2],[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 158,000 [1],[5],[13] 255,000 [2],[11],[14]     158,000 [1],[5],[13]     158,000 [1],[5],[13]   255,000 [2],[11],[14]                
Cost 239,000 [1],[5],[13] 239,000 [2],[11],[14]     239,000 [1],[5],[13]     239,000 [1],[5],[13]   239,000 [2],[11],[14]                
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 261,000 [1],[5] 259,000 [2],[11]     261,000 [1],[5]     261,000 [1],[5]   259,000 [2],[11]                
Cost $ 264,000 [1],[5] $ 259,000 [2],[11]     $ 264,000 [1],[5]     $ 264,000 [1],[5]   $ 259,000 [2],[11]                
Investment, interest rate, paid in kind 4.00% [1],[5] 4.00% [2],[11]     4.00% [1],[5]     4.00% [1],[5]   4.00% [2],[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 $ 834,000 [1],[3],[5],[15] $ 798,000 [2],[8],[11],[12]     $ 834,000 [1],[3],[5],[15]     $ 834,000 [1],[3],[5],[15]   $ 798,000 [2],[8],[11],[12]                
Cost 781,000 [1],[3],[5],[15] 779,000 [2],[8],[11],[12]     781,000 [1],[3],[5],[15]     781,000 [1],[3],[5],[15]   779,000 [2],[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 [1],[3],[5],[15] (9,000) [2],[8],[11],[12]     0 [1],[3],[5],[15]     0 [1],[3],[5],[15]   (9,000) [2],[8],[11],[12]                
Cost (11,000) [1],[3],[5],[15] (12,000) [2],[8],[11],[12]     (11,000) [1],[3],[5],[15]     (11,000) [1],[3],[5],[15]   (12,000) [2],[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 3,447,000 [1],[3],[5],[28] 3,380,000 [2],[8],[11],[29]     3,447,000 [1],[3],[5],[28]     3,447,000 [1],[3],[5],[28]   3,380,000 [2],[8],[11],[29]                
Cost 3,423,000 [1],[3],[5],[28] 3,366,000 [2],[8],[11],[29]     3,423,000 [1],[3],[5],[28]     3,423,000 [1],[3],[5],[28]   3,366,000 [2],[8],[11],[29]                
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 [1],[3],[5],[24] 17,552,000       17,552,000     17,552,000                    
Cost [1],[3],[5],[24] 17,485,000       17,485,000     17,485,000                    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[24] (44,000)       (44,000)     (44,000)                    
Cost [1],[3],[5],[24] (55,000)       (55,000)     (55,000)                    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5] 6,049,000       6,049,000     6,049,000                    
Cost [1],[5] $ 6,031,000       $ 6,031,000     $ 6,031,000                    
Investment, interest rate, paid in kind [1],[5] 11.00%       11.00%     11.00%                    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[25]   25,979,000               25,979,000                
Cost [2],[8],[11],[25]   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 [2],[11]   5,547,000               5,547,000                
Cost [2],[11]   $ 5,536,000               $ 5,536,000                
Investment, interest rate, paid in kind [2],[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 854,000 1,182,000     854,000     854,000   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 [1],[3],[5],[24] 21,586,000       21,586,000     21,586,000                    
Cost [1],[3],[5],[24] 21,598,000       21,598,000     21,598,000                    
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[27]   1,578,000               1,578,000                
Cost [2],[8],[11],[27]   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 [2],[8],[11],[27]   5,560,000               5,560,000                
Cost [2],[8],[11],[27]   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 [2],[8],[11],[27]   14,178,000               14,178,000                
Cost [2],[8],[11],[27]   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 1,200,000 [1],[5],[13] 1,019,000 [2],[11],[14]     1,200,000 [1],[5],[13]     1,200,000 [1],[5],[13]   1,019,000 [2],[11],[14]                
Cost 677,000 [1],[5],[13] 677,000 [2],[11],[14]     677,000 [1],[5],[13]     677,000 [1],[5],[13]   677,000 [2],[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 12,376,000 [1],[3],[5],[15] 12,322,000 [2],[8],[11],[16]     12,376,000 [1],[3],[5],[15]     12,376,000 [1],[3],[5],[15]   12,322,000 [2],[8],[11],[16]                
Cost 12,301,000 [1],[3],[5],[15] 12,289,000 [2],[8],[11],[16]     12,301,000 [1],[3],[5],[15]     12,301,000 [1],[3],[5],[15]   12,289,000 [2],[8],[11],[16]                
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 [2]   30,339,000               30,339,000                
Cost [2]   46,622,000               46,622,000                
Investment, Identifier [Axis]: Thompson Rivers LLC, Investment Funds & Vehicles, Member Interest                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[13] 15,221,000       15,221,000     15,221,000                    
Cost [1],[13] 30,965,000       30,965,000     30,965,000                    
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest                                    
Schedule of Investments [Line Items]                                    
Fair value 15,221,000 30,339,000     15,221,000     15,221,000   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 5,727,000 [1],[3],[6] 5,801,000 [2],[8],[12]     5,727,000 [1],[3],[6]     5,727,000 [1],[3],[6]   5,801,000 [2],[8],[12]                
Cost 5,929,000 [1],[3],[6] 5,996,000 [2],[8],[12]     5,929,000 [1],[3],[6]     5,929,000 [1],[3],[6]   5,996,000 [2],[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 3,642,000 [1],[3],[5],[6] 3,561,000 [2],[8],[11],[12]     3,642,000 [1],[3],[5],[6]     3,642,000 [1],[3],[5],[6]   3,561,000 [2],[8],[11],[12]                
Cost $ 3,642,000 [1],[3],[5],[6] $ 3,561,000 [2],[8],[11],[12]     $ 3,642,000 [1],[3],[5],[6]     $ 3,642,000 [1],[3],[5],[6]   $ 3,561,000 [2],[8],[11],[12]                
Investment, interest rate, paid in kind 5.00% [1],[3],[5],[6] 5.00% [2],[8],[11],[12]     5.00% [1],[3],[5],[6]     5.00% [1],[3],[5],[6]   5.00% [2],[8],[11],[12]                
Investment, Identifier [Axis]: Trader Corporation, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount $ 353,000 $ 345,000     $ 353,000     $ 353,000   $ 345,000                
Investment, Identifier [Axis]: Trader Corporation, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,602,000 [1],[3],[5],[17],[59] 4,486,000 [2],[8],[11],[18],[60]     4,602,000 [1],[3],[5],[17],[59]     4,602,000 [1],[3],[5],[17],[59]   4,486,000 [2],[8],[11],[18],[60]                
Cost 4,445,000 [1],[3],[5],[17],[59] 4,450,000 [2],[8],[11],[18],[60]     4,445,000 [1],[3],[5],[17],[59]     4,445,000 [1],[3],[5],[17],[59]   4,450,000 [2],[8],[11],[18],[60]                
Investment, Identifier [Axis]: Trader Corporation, Technology, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (7,000) [1],[3],[5],[17],[59] (9,000) [2],[8],[11],[18],[60]     (7,000) [1],[3],[5],[17],[59]     (7,000) [1],[3],[5],[17],[59]   (9,000) [2],[8],[11],[18],[60]                
Cost (8,000) [1],[3],[5],[17],[59] (9,000) [2],[8],[11],[18],[60]     (8,000) [1],[3],[5],[17],[59]     (8,000) [1],[3],[5],[17],[59]   (9,000) [2],[8],[11],[18],[60]                
Investment, Identifier [Axis]: Transit Technologies LLC, Software, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 6,035,000 [1],[3],[5],[38] 5,872,000 [2],[8],[11],[29]     6,035,000 [1],[3],[5],[38]     6,035,000 [1],[3],[5],[38]   5,872,000 [2],[8],[11],[29]                
Cost 5,998,000 [1],[3],[5],[38] 5,987,000 [2],[8],[11],[29]     5,998,000 [1],[3],[5],[38]     5,998,000 [1],[3],[5],[38]   5,987,000 [2],[8],[11],[29]                
Investment, Identifier [Axis]: Transportation Insight, LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 10,858,000 [1],[3],[5],[28] 11,032,000 [2],[8],[11],[12]     10,858,000 [1],[3],[5],[28]     10,858,000 [1],[3],[5],[28]   11,032,000 [2],[8],[11],[12]                
Cost 11,142,000 [1],[3],[5],[28] 11,161,000 [2],[8],[11],[12]     11,142,000 [1],[3],[5],[28]     11,142,000 [1],[3],[5],[28]   11,161,000 [2],[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 14,375,000 [1],[3],[5],[6] 14,570,000 [2],[8],[11]     14,375,000 [1],[3],[5],[6]     14,375,000 [1],[3],[5],[6]   14,570,000 [2],[8],[11]                
Cost 14,551,000 [1],[3],[5],[6] 14,597,000 [2],[8],[11]     14,551,000 [1],[3],[5],[6]     14,551,000 [1],[3],[5],[6]   14,597,000 [2],[8],[11]                
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Automotive Parts & Equipment, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 18,993,000 [1],[3],[5],[15] 18,756,000 [2],[8],[11],[16]     18,993,000 [1],[3],[5],[15]     18,993,000 [1],[3],[5],[15]   18,756,000 [2],[8],[11],[16]                
Cost 18,978,000 [1],[3],[5],[15] 19,017,000 [2],[8],[11],[16]     18,978,000 [1],[3],[5],[15]     18,978,000 [1],[3],[5],[15]   19,017,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[4],[5],[13] 0 [2],[9],[11]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11]                
Cost 0 [1],[4],[5],[13] 0 [2],[9],[11]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11]                
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Preferred Unit                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11],[14]                
Cost 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11],[14]                
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, Class A LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[11],[14]   512,000               512,000                
Cost [2],[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 [1],[5] 1,101,000       1,101,000     1,101,000                    
Cost [1],[5] 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 [1],[3],[5],[38] 6,735,000       6,735,000     6,735,000                    
Cost [1],[3],[5],[38] 6,740,000       6,740,000     6,740,000                    
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[29]   3,075,000               3,075,000                
Cost [2],[8],[11],[29]   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 [2],[8],[11],[12]   3,750,000               3,750,000                
Cost [2],[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 8,134,000 [1],[3],[5],[15] 8,061,000 [2],[8],[11],[12]     8,134,000 [1],[3],[5],[15]     8,134,000 [1],[3],[5],[15]   8,061,000 [2],[8],[11],[12]                
Cost 8,176,000 [1],[3],[5],[15] 8,187,000 [2],[8],[11],[12]     8,176,000 [1],[3],[5],[15]     8,176,000 [1],[3],[5],[15]   8,187,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Turnberry Solutions, Inc., Consumer Cyclical, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,894,000 [1],[3],[5],[15] 4,900,000 [2],[8],[11],[16]     4,894,000 [1],[3],[5],[15]     4,894,000 [1],[3],[5],[15]   4,900,000 [2],[8],[11],[16]                
Cost 4,884,000 [1],[3],[5],[15] 4,900,000 [2],[8],[11],[16]     4,884,000 [1],[3],[5],[15]     4,884,000 [1],[3],[5],[15]   4,900,000 [2],[8],[11],[16]                
Investment, Identifier [Axis]: U.S. Silica Company, Metal & Glass Containers, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[18],[27]   1,439,000               1,439,000                
Cost [2],[8],[18],[27]   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 10,474,000 [1],[3],[5],[17],[32] 9,677,000 [2],[8],[11],[18],[33]     10,474,000 [1],[3],[5],[17],[32]     10,474,000 [1],[3],[5],[17],[32]   9,677,000 [2],[8],[11],[18],[33]                
Cost $ 11,660,000 [1],[3],[5],[17],[32] 11,441,000 [2],[8],[11],[18],[33]     $ 11,660,000 [1],[3],[5],[17],[32]     $ 11,660,000 [1],[3],[5],[17],[32]   11,441,000 [2],[8],[11],[18],[33]                
Investment, interest rate, paid in kind [1],[3],[5],[17],[32] 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 [1],[3],[5],[24] $ 15,459,000       $ 15,459,000     $ 15,459,000                    
Cost [1],[3],[5],[24] 15,993,000       15,993,000     15,993,000                    
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 [2],[8],[11],[16]   15,390,000               15,390,000                
Cost [2],[8],[11],[16]   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 3,629,000 3,629,000     3,629,000     3,629,000   3,629,000                
Investment, Identifier [Axis]: Union Bidco Limited, Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 83,000 78,000     83,000     83,000   78,000                
Investment, Identifier [Axis]: Union Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 872,000 [1],[3],[5],[17],[32] 847,000 [2],[8],[11],[18],[33]     872,000 [1],[3],[5],[17],[32]     872,000 [1],[3],[5],[17],[32]   847,000 [2],[8],[11],[18],[33]                
Cost 872,000 [1],[3],[5],[17],[32] 870,000 [2],[8],[11],[18],[33]     872,000 [1],[3],[5],[17],[32]     872,000 [1],[3],[5],[17],[32]   870,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 675,000 1,170,000     675,000     675,000   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 1,443,000 [1],[3],[5],[17],[30] 1,180,000 [2],[8],[11],[18],[31]     1,443,000 [1],[3],[5],[17],[30]     1,443,000 [1],[3],[5],[17],[30]   1,180,000 [2],[8],[11],[18],[31]                
Cost 1,700,000 [1],[3],[5],[17],[30] 1,184,000 [2],[8],[11],[18],[31]     1,700,000 [1],[3],[5],[17],[30]     1,700,000 [1],[3],[5],[17],[30]   1,184,000 [2],[8],[11],[18],[31]                
Investment, Identifier [Axis]: Unither (Uniholding), Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 473,000 0     473,000     473,000   0                
Investment, Identifier [Axis]: Unither (Uniholding), Pharma-ceuticals, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[17],[20] 1,999,000       1,999,000     1,999,000                    
Cost [1],[3],[5],[17],[20] 1,952,000       1,952,000     1,952,000                    
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value 1,563,000 [1],[3],[5],[17],[20] 1,585,000 [2],[8],[11],[18],[21]     1,563,000 [1],[3],[5],[17],[20]     1,563,000 [1],[3],[5],[17],[20]   1,585,000 [2],[8],[11],[18],[21]                
Cost $ 1,715,000 [1],[3],[5],[17],[20] 1,712,000 [2],[8],[11],[18],[21]     $ 1,715,000 [1],[3],[5],[17],[20]     $ 1,715,000 [1],[3],[5],[17],[20]   1,712,000 [2],[8],[11],[18],[21]                
Investment, interest rate, paid in kind 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 $ 3,359,000 [1],[3],[5],[6],[17] 3,483,000 [2],[8],[11],[12],[18]     $ 3,359,000 [1],[3],[5],[6],[17]     $ 3,359,000 [1],[3],[5],[6],[17]   3,483,000 [2],[8],[11],[12],[18]                
Cost $ 3,470,000 [1],[3],[5],[6],[17] 3,465,000 [2],[8],[11],[12],[18]     $ 3,470,000 [1],[3],[5],[6],[17]     $ 3,470,000 [1],[3],[5],[6],[17]   3,465,000 [2],[8],[11],[12],[18]                
Investment, interest rate, paid in kind 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 $ 12,000 [1],[4],[17] 91,000 [2],[9],[18]     $ 12,000 [1],[4],[17]     $ 12,000 [1],[4],[17]   91,000 [2],[9],[18]                
Cost 2,541,000 [1],[4],[17] 2,930,000 [2],[9],[18]     2,541,000 [1],[4],[17]     2,541,000 [1],[4],[17]   2,930,000 [2],[9],[18]                
Investment, Identifier [Axis]: VOYA CLO 2016-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes                                    
Schedule of Investments [Line Items]                                    
Fair value 853,000 [1],[4],[17] 1,551,000 [2],[9],[18]     853,000 [1],[4],[17]     853,000 [1],[4],[17]   1,551,000 [2],[9],[18]                
Cost 3,068,000 [1],[4],[17] 3,301,000 [2],[9],[18]     3,068,000 [1],[4],[17]     3,068,000 [1],[4],[17]   3,301,000 [2],[9],[18]                
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 [1],[3],[5],[28] 4,673,000 [2],[8],[11],[27]     4,783,000 [1],[3],[5],[28]     4,783,000 [1],[3],[5],[28]   4,673,000 [2],[8],[11],[27]                
Cost 4,727,000 [1],[3],[5],[28] 4,713,000 [2],[8],[11],[27]     4,727,000 [1],[3],[5],[28]     4,727,000 [1],[3],[5],[28]   4,713,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 2,000 [1],[4],[5],[13] 2,000 [2],[9],[11],[14]     2,000 [1],[4],[5],[13]     2,000 [1],[4],[5],[13]   2,000 [2],[9],[11],[14]                
Cost 60,000 [1],[4],[5],[13] 60,000 [2],[9],[11],[14]     60,000 [1],[4],[5],[13]     60,000 [1],[4],[5],[13]   60,000 [2],[9],[11],[14]                
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Warrants                                    
Schedule of Investments [Line Items]                                    
Fair value 3,000 [1],[4],[5],[13] 3,000 [2],[9],[11],[14]     3,000 [1],[4],[5],[13]     3,000 [1],[4],[5],[13]   3,000 [2],[9],[11],[14]                
Cost 72,000 [1],[4],[5],[13] 72,000 [2],[9],[11],[14]     72,000 [1],[4],[5],[13]     72,000 [1],[4],[5],[13]   72,000 [2],[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 416,000 [1],[3],[5],[17],[32] 3,238,000 [2],[8],[11],[18],[36]     416,000 [1],[3],[5],[17],[32]     416,000 [1],[3],[5],[17],[32]   3,238,000 [2],[8],[11],[18],[36]                
Cost 412,000 [1],[3],[5],[17],[32] 3,640,000 [2],[8],[11],[18],[36]     412,000 [1],[3],[5],[17],[32]     412,000 [1],[3],[5],[17],[32]   3,640,000 [2],[8],[11],[18],[36]                
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan 2                                    
Schedule of Investments [Line Items]                                    
Fair value 3,313,000 [1],[3],[5],[17],[35] 407,000 [2],[8],[11],[18],[33]     3,313,000 [1],[3],[5],[17],[35]     3,313,000 [1],[3],[5],[17],[35]   407,000 [2],[8],[11],[18],[33]                
Cost 3,646,000 [1],[3],[5],[17],[35] 411,000 [2],[8],[11],[18],[33]     3,646,000 [1],[3],[5],[17],[35]     3,646,000 [1],[3],[5],[17],[35]   411,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Vision Solutions Inc., Business Equipment & Services, Second Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 5,562,000 [1],[3],[4],[6] 4,771,000 [2],[8],[9],[12]     5,562,000 [1],[3],[4],[6]     5,562,000 [1],[3],[4],[6]   4,771,000 [2],[8],[9],[12]                
Cost 6,497,000 [1],[3],[4],[6] 6,497,000 [2],[8],[9],[12]     6,497,000 [1],[3],[4],[6]     6,497,000 [1],[3],[4],[6]   6,497,000 [2],[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 3,467,000 [1],[5] 3,792,000 [2],[11]     3,467,000 [1],[5]     3,467,000 [1],[5]   3,792,000 [2],[11]                
Cost 4,286,000 [1],[5] 4,643,000 [2],[11]     4,286,000 [1],[5]     4,286,000 [1],[5]   4,643,000 [2],[11]                
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 7,605,000 [1],[3],[5],[15] 7,645,000 [2],[8],[11],[12]     7,605,000 [1],[3],[5],[15]     7,605,000 [1],[3],[5],[15]   7,645,000 [2],[8],[11],[12]                
Cost 7,491,000 [1],[3],[5],[15] 7,520,000 [2],[8],[11],[12]     7,491,000 [1],[3],[5],[15]     7,491,000 [1],[3],[5],[15]   7,520,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, Partnership Units                                    
Schedule of Investments [Line Items]                                    
Fair value 392,000 [1],[5],[13] 293,000 [2],[11],[14]     392,000 [1],[5],[13]     392,000 [1],[5],[13]   293,000 [2],[11],[14]                
Cost 164,000 [1],[5],[13] 164,000 [2],[11],[14]     164,000 [1],[5],[13]     164,000 [1],[5],[13]   164,000 [2],[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 [1],[5],[38] 5,828,000       5,828,000     5,828,000                    
Cost [1],[5],[38] 5,921,000       5,921,000     5,921,000                    
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan 1                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[12]   3,302,000               3,302,000                
Cost [2],[8],[11],[12]   3,301,000               3,301,000                
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[16]   13,937,000               13,937,000                
Cost [2],[8],[11],[16]   13,956,000               13,956,000                
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[8],[11],[16]   1,056,000               1,056,000                
Cost [2],[8],[11],[16]   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 [1],[3],[5],[15] 13,974,000       13,974,000     13,974,000                    
Cost [1],[3],[5],[15] 13,922,000       13,922,000     13,922,000                    
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] 699,000       699,000     699,000                    
Cost [1],[3],[5],[15] 692,000       692,000     692,000                    
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 1,739,000 1,366,000     1,739,000     1,739,000   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 [2],[18]   20,212,000               20,212,000                
Cost [2],[18]   22,520,000               22,520,000                
Investment, Identifier [Axis]: Waccamaw River LLC, Investment Funds & Vehicles, Member Interest                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[17] 20,358,000       20,358,000     20,358,000                    
Cost [1],[17] 25,000,000       25,000,000     25,000,000                    
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest                                    
Schedule of Investments [Line Items]                                    
Fair value 20,358,000 20,212,000     20,358,000     20,358,000   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 0 [1],[4],[5],[13] 0 [2],[9],[11],[14]     0 [1],[4],[5],[13]     0 [1],[4],[5],[13]   0 [2],[9],[11],[14]                
Cost 3,598,000 [1],[4],[5],[13] 3,598,000 [2],[9],[11],[14]     3,598,000 [1],[4],[5],[13]     3,598,000 [1],[4],[5],[13]   3,598,000 [2],[9],[11],[14]                
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[4],[5],[13] 0       0     0                    
Cost [1],[4],[5],[13] 0       0     0                    
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity (1.62% Partnership Interest)                                    
Schedule of Investments [Line Items]                                    
Fair value [2],[9],[11],[14]   0               0                
Cost [2],[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 23,000 [1],[4],[7],[15] 33,000 [2],[9],[12]     23,000 [1],[4],[7],[15]     23,000 [1],[4],[7],[15]   33,000 [2],[9],[12]                
Cost 41,000 [1],[4],[7],[15] 41,000 [2],[9],[12]     41,000 [1],[4],[7],[15]     41,000 [1],[4],[7],[15]   41,000 [2],[9],[12]                
Investment, Identifier [Axis]: Wheels Up Experience Inc, Transportation Services, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 10,901,000 [1],[5] 13,153,000 [2],[11]     10,901,000 [1],[5]     10,901,000 [1],[5]   13,153,000 [2],[11]                
Cost 12,348,000 [1],[5] 12,973,000 [2],[11]     12,348,000 [1],[5]     12,348,000 [1],[5]   12,973,000 [2],[11]                
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] 8,350,000       8,350,000     8,350,000                    
Cost [1],[3],[5],[15] 8,345,000       8,345,000     8,345,000                    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, LP Units                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[5],[13] 630,000       630,000     630,000                    
Cost [1],[5],[13] 631,000       631,000     631,000                    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value [1],[3],[5],[15] (71,000)       (71,000)     (71,000)                    
Cost [1],[3],[5],[15] (71,000)       (71,000)     (71,000)                    
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 46,000 [1],[3],[4],[19] 41,000 [2],[8],[9],[12]     46,000 [1],[3],[4],[19]     46,000 [1],[3],[4],[19]   41,000 [2],[8],[9],[12]                
Cost 48,000 [1],[3],[4],[19] 48,000 [2],[8],[9],[12]     48,000 [1],[3],[4],[19]     48,000 [1],[3],[4],[19]   48,000 [2],[8],[9],[12]                
Investment, Identifier [Axis]: Woodland Foods, Inc., Line of Credit                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,296,000 456,000     1,296,000     1,296,000   456,000                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 1,004,000 [1],[5],[13] 1,012,000 [2],[11],[14]     1,004,000 [1],[5],[13]     1,004,000 [1],[5],[13]   1,012,000 [2],[11],[14]                
Cost 1,663,000 [1],[5],[13] 1,663,000 [2],[11],[14]     1,663,000 [1],[5],[13]     1,663,000 [1],[5],[13]   1,663,000 [2],[11],[14]                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 4,962,000 [1],[3],[5],[15] 4,882,000 [2],[8],[11],[12]     4,962,000 [1],[3],[5],[15]     4,962,000 [1],[3],[5],[15]   4,882,000 [2],[8],[11],[12]                
Cost 5,344,000 [1],[3],[5],[15] 5,350,000 [2],[8],[11],[12]     5,344,000 [1],[3],[5],[15]     5,344,000 [1],[3],[5],[15]   5,350,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 753,000 [1],[3],[5],[15] 1,556,000 [2],[8],[11],[12]     753,000 [1],[3],[5],[15]     753,000 [1],[3],[5],[15]   1,556,000 [2],[8],[11],[12]                
Cost 911,000 [1],[3],[5],[15] 1,748,000 [2],[8],[11],[12]     911,000 [1],[3],[5],[15]     911,000 [1],[3],[5],[15]   1,748,000 [2],[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 8,753,000 [1],[3],[5],[24] 8,821,000 [2],[8],[11],[27]     8,753,000 [1],[3],[5],[24]     8,753,000 [1],[3],[5],[24]   8,821,000 [2],[8],[11],[27]                
Cost 8,717,000 [1],[3],[5],[24] 8,795,000 [2],[8],[11],[27]     8,717,000 [1],[3],[5],[24]     8,717,000 [1],[3],[5],[24]   8,795,000 [2],[8],[11],[27]                
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 [1],[3],[5],[24] 2,428,000 [2],[8],[11],[27]     2,414,000 [1],[3],[5],[24]     2,414,000 [1],[3],[5],[24]   2,428,000 [2],[8],[11],[27]                
Cost 2,403,000 [1],[3],[5],[24] 2,423,000 [2],[8],[11],[27]     2,403,000 [1],[3],[5],[24]     2,403,000 [1],[3],[5],[24]   2,423,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, CAF Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 3,286,000 3,109,000     3,286,000     3,286,000   3,109,000                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Common Stock                                    
Schedule of Investments [Line Items]                                    
Fair value 539,000 [1],[5],[13],[17] 549,000 [2],[11],[14],[18]     539,000 [1],[5],[13],[17]     539,000 [1],[5],[13],[17]   549,000 [2],[11],[14],[18]                
Cost 565,000 [1],[5],[13],[17] 565,000 [2],[11],[14],[18]     565,000 [1],[5],[13],[17]     565,000 [1],[5],[13],[17]   565,000 [2],[11],[14],[18]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 5,798,000 [1],[3],[5],[17],[32] 5,446,000 [2],[8],[11],[18],[33]     5,798,000 [1],[3],[5],[17],[32]     5,798,000 [1],[3],[5],[17],[32]   5,446,000 [2],[8],[11],[18],[33]                
Cost 5,628,000 [1],[3],[5],[17],[32] 5,586,000 [2],[8],[11],[18],[33]     5,628,000 [1],[3],[5],[17],[32]     5,628,000 [1],[3],[5],[17],[32]   5,586,000 [2],[8],[11],[18],[33]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Subordinated Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 2,981,000 [1],[5],[17] 2,502,000 [2],[11],[18]     2,981,000 [1],[5],[17]     2,981,000 [1],[5],[17]   2,502,000 [2],[11],[18]                
Cost $ 2,875,000 [1],[5],[17] $ 2,553,000 [2],[11],[18]     $ 2,875,000 [1],[5],[17]     $ 2,875,000 [1],[5],[17]   $ 2,553,000 [2],[11],[18]                
Investment, interest rate, paid in kind 11.00% [1],[5],[17] 11.00% [2],[11],[18]     11.00% [1],[5],[17]     11.00% [1],[5],[17]   11.00% [2],[11],[18]                
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, Food & Beverage, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 3,977,000 [1],[3],[5],[15] 2,628,000 [2],[8],[11],[12]     3,977,000 [1],[3],[5],[15]     3,977,000 [1],[3],[5],[15]   2,628,000 [2],[8],[11],[12]                
Cost 3,969,000 [1],[3],[5],[15] 2,623,000 [2],[8],[11],[12]     3,969,000 [1],[3],[5],[15]     3,969,000 [1],[3],[5],[15]   2,623,000 [2],[8],[11],[12]                
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, LLC Units                                    
Schedule of Investments [Line Items]                                    
Fair value 217,000 [1],[5],[13] 189,000 [2],[11],[14]     217,000 [1],[5],[13]     217,000 [1],[5],[13]   189,000 [2],[11],[14]                
Cost 153,000 [1],[5],[13] 153,000 [2],[11],[14]     153,000 [1],[5],[13]     153,000 [1],[5],[13]   153,000 [2],[11],[14]                
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value (9,000) [1],[3],[5],[15] (12,000) [2],[8],[11],[12]     (9,000) [1],[3],[5],[15]     (9,000) [1],[3],[5],[15]   (12,000) [2],[8],[11],[12]                
Cost (13,000) [1],[3],[5],[15] (14,000) [2],[8],[11],[12]     (13,000) [1],[3],[5],[15]     (13,000) [1],[3],[5],[15]   (14,000) [2],[8],[11],[12]                
Investment, Identifier [Axis]: ZB Holdco LLC, Revolver                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 845,000 845,000     845,000     845,000   845,000                
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Capex / Acquisition Facility                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 2,660,000 2,516,000     2,660,000     2,660,000   2,516,000                
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Services: Business, First Lien Senior Secured Term Loan                                    
Schedule of Investments [Line Items]                                    
Fair value 5,685,000 [1],[3],[5],[17],[32] 5,162,000 [2],[8],[11],[18],[43]     5,685,000 [1],[3],[5],[17],[32]     5,685,000 [1],[3],[5],[17],[32]   5,162,000 [2],[8],[11],[18],[43]                
Cost 6,172,000 [1],[3],[5],[17],[32] 6,149,000 [2],[8],[11],[18],[43]     6,172,000 [1],[3],[5],[17],[32]     6,172,000 [1],[3],[5],[17],[32]   6,149,000 [2],[8],[11],[18],[43]                
Investment, Identifier [Axis]: eShipping, LLC, Delayed Draw Term Loan                                    
Schedule of Investments [Line Items]                                    
Committed investment amount 1,650,000 1,650,000     1,650,000     1,650,000   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 2,873,000 [1],[3],[5],[24] 3,262,000 [2],[8],[11],[27]     2,873,000 [1],[3],[5],[24]     2,873,000 [1],[3],[5],[24]   3,262,000 [2],[8],[11],[27]                
Cost 2,805,000 [1],[3],[5],[24] 3,209,000 [2],[8],[11],[27]     2,805,000 [1],[3],[5],[24]     2,805,000 [1],[3],[5],[24]   3,209,000 [2],[8],[11],[27]                
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, Revolver                                    
Schedule of Investments [Line Items]                                    
Fair value 0 [1],[3],[5],[24] (9,000) [2],[8],[11],[27]     0 [1],[3],[5],[24]     0 [1],[3],[5],[24]   (9,000) [2],[8],[11],[27]                
Cost $ (22,000) [1],[3],[5],[24] $ (24,000) [2],[8],[11],[27]     $ (22,000) [1],[3],[5],[24]     $ (22,000) [1],[3],[5],[24]   $ (24,000) [2],[8],[11],[27]                
[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 February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[2] 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.
[3] Debt investment includes interest rate floor feature.
[4] 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.
[5] The fair value of the investment was determined using significant unobservable inputs.
[6] The interest rate on these loans is subject to 3 Month LIBOR, which as of June 30, 2023 was 5.54543%.
[7] The interest rate on these loans is subject to Prime, which as of June 30, 2023 was 8.25000%.
[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 was purchased as part of the Sierra Merger and is part of the Sierra Reference Portfolio for purposes of the Sierra Credit Support Agreement.
[14] Investment is non-income producing.
[15] The interest rate on these loans is subject to 1 Month SOFR, which as of June 30, 2023 was 5.14078%.
[16] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2022 was 4.58745%.
[17] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 26.5% of total investments at fair value as of June 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).
[18] 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).
[19] The interest rate on these loans is subject to 1 Month LIBOR, which as of June 30, 2023 was 5.21771%.
[20] The interest rate on these loans is subject to 3 Month EURIBOR, which as of June 30, 2023 was 3.57700%.
[21] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2022 was 2.13200%.
[22] The interest rate on these loans is subject to 6 Month SONIA, which as of June 30, 2023 was 5.66650%.
[23] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2022 was 3.01500%.
[24] The interest rate on these loans is subject to 1 Month SOFR, which as of June 30, 2023 was 5.14078%.
[25] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2022 was 4.35806%.
[26] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2022 was 4.78131%.
[27] The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.
[28] The interest rate on these loans is subject to 6 Month LIBOR, which as of June 30, 2023 was 5.76229%.
[29] The interest rate on these loans is subject to 6 Month LIBOR, which as of December 31, 2022 was 5.13886%.
[30] The interest rate on these loans is subject to 6 Month EURIBOR, which as of June 30, 2023 was 3.90000%.
[31] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2022 was 2.69300%.
[32] The interest rate on these loans is subject to 1 Month SONIA, which as of June 30, 2023 was 4.93960%.
[33] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2022 was 3.75470%.
[34] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2022 was 1.88400%.
[35] The interest rate on these loans is subject to 3 Month SONIA, which as of June 30, 2023 was 5.27080%.
[36] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2022 was 4.09490%.
[37] The interest rate on these loans is subject to 6 Month SOFR, which as of June 30, 2023 was 5.39064%.
[38] The interest rate on these loans is subject to 3 Month SOFR, which as of June 30, 2023 was 5.26836%.
[39] The interest rate on these loans is subject to 1 Month BBSY, which as of June 30, 2023 was 4.14400%.
[40] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2022 was 3.76500%.
[41] The interest rate on these loans is subject to 3 Month CDOR, which as of June 30, 2023 was 5.39500%.
[42] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2022 was 2.70100%.
[43] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2022 was 3.43570%.
[44] The interest rate on these loans is subject to 1 Month CDOR, which as of June 30, 2023 was 5.27250%.
[45] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2022 was 4.93500%.
[46] 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.
[47] The interest rate on these loans is subject to 3 Month BBSY, which as of June 30, 2023 was 4.35070%.
[48] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2022 was 3.26470%.
[49] The interest rate on these loans is subject to 1 Month EURIBOR, which as of June 30, 2023 was 3.39900%.
[50] The interest rate on these loans is subject to 3 Month STIBOR, which as of June 30, 2023 was 3.81400%.
[51] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2022 was 4.53000%.
[52] The interest rate on these loans is subject to 3 Month BKBM, which as of June 30, 2023 was 5.68000%.
[53] Non-accrual investment.
[54] The interest rate on these loans is subject to Prime, which as of December 31, 2022 was 7.50000%.
[55] The interest rate on these loans is subject to 6 Month SARON, which as of June 30, 2023 was 1.70654%.
[56] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2022 was 3.04000%.
[57] The interest rate on these loans is subject to 3 Month SARON, which as of December 31, 2022 was 0.94212%.
[58] The interest rate on these loans is subject to 1 Month NIBOR, which as of June 30, 2023 was 4.01000%.
[59] The interest rate on these loans is subject to 6 Month BBSY, which as of June 30, 2023 was 4.70000%.
[60] The interest rate on these loans is subject to 1 Month CDOR, which as of December 31, 2022 was 4.73750%.