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INVESTMENTS - Additional Information (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
investment
loan
Dec. 31, 2022
USD ($)
loan
investment
Feb. 25, 2022
member
Mar. 31, 2023
USD ($)
investment
loan
Mar. 31, 2022
USD ($)
investment
Dec. 31, 2022
USD ($)
loan
investment
Feb. 01, 2023
USD ($)
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 ($)
Summary of Investment Holdings [Line Items]                            
Number of investments entered into | investment       11 22                  
Purchases of portfolio investments       $ 65,800,000 $ 229,300,000                  
Committed investment amount $ 371,795,000 $ 308,532,000   371,795,000   $ 308,532,000                
Total dividend income       7,874,000 7,693,000                  
Fair value 2,556,114,000 2,448,935,000   2,556,114,000   2,448,935,000                
Cost 2,658,484,000 2,562,398,000   2,658,484,000   2,562,398,000                
Borrowings under credit facilities $ 769,112,000 $ 729,144,000   $ 769,112,000   $ 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                    
Number of portfolio companies | investment 9 7   9   7                
Number of portfolio companies, initiated by the company | investment 2 1   2   1                
Investment, interest rate, paid in kind [1],[2],[3] 1.50%     1.50%                    
Single Portfolio Company | Fair Value | Portfolio Company Investment Risk                            
Summary of Investment Holdings [Line Items]                            
Concentration risk, percent 6.00% 5.90%                        
Fair Value, Inputs, Level 3                            
Summary of Investment Holdings [Line Items]                            
Unrealized gain (loss)       $ 9,600,000 21,000,000                  
Minimum | Rocade Holdings LLC                            
Summary of Investment Holdings [Line Items]                            
Investment, interest rate, paid in kind             10.00%              
Maximum | Rocade Holdings LLC                            
Summary of Investment Holdings [Line Items]                            
Investment, interest rate, paid in kind             25.00%              
Jocassee Partners LLC                            
Summary of Investment Holdings [Line Items]                            
Repayments received/sales of portfolio investments       875,900,000   $ 875,900,000                
Loss on sale of investments       0 200,000                  
Due from related parties $ 0 $ 18,200,000   0   18,200,000                
MassMutual Ascend Life Insurance Company                            
Summary of Investment Holdings [Line Items]                            
Number of members | member     2                      
Line of Credit                            
Summary of Investment Holdings [Line Items]                            
Long-term debt, gross 769,112,000 729,144,000   769,112,000   729,144,000                
SCRS                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount                           $ 500,000,000
Jocassee Partners LLC | Subscription Facility | Bank Of America Subscription Facility | Line of Credit                            
Summary of Investment Holdings [Line Items]                            
Borrowings under credit facilities 175,900,000 174,300,000   175,900,000   174,300,000                
Jocassee Partners LLC | Subscription Facility | Citibank N.A. Subscription Facility | Line of Credit                            
Summary of Investment Holdings [Line Items]                            
Borrowings under credit facilities 359,800,000 357,900,000   359,800,000   357,900,000                
Jocassee Partners LLC | Subscription Facility | Term Debt Securitization | Line of Credit                            
Summary of Investment Holdings [Line Items]                            
Borrowings under credit facilities 323,300,000 323,300,000   323,300,000   323,300,000                
Thompson Rivers LLC                            
Summary of Investment Holdings [Line Items]                            
Dividends       57,000,000 20,000,000                  
Total contributed capital 450,000,000     450,000,000                    
All Member Of Waccamaw River LLC                            
Summary of Investment Holdings [Line Items]                            
Total contributed capital 125,000,000     125,000,000                    
Waccamaw River, LLC                            
Summary of Investment Holdings [Line Items]                            
Dividends       3,600,000 1,500,000                  
Waccamaw River, LLC | JPMorgan Chase Bank N.A. Non-Recourse Loan | Secured Debt                            
Summary of Investment Holdings [Line Items]                            
Long-term debt, gross 76,500,000 72,300,000   76,500,000   72,300,000                
Waccamaw River, LLC | Barclay Bank PLC Non-Recourse Loan | Secured Debt                            
Summary of Investment Holdings [Line Items]                            
Long-term debt, gross 71,300,000 44,800,000   71,300,000   44,800,000                
All Members Of Sierra JV                            
Summary of Investment Holdings [Line Items]                            
Number of members | member     4                      
Sierra JV | Revolving Credit Facility | Line of Credit                            
Summary of Investment Holdings [Line Items]                            
Borrowings under credit facilities 77,000,000 75,000,000   77,000,000   75,000,000                
Jocassee Partners LLC                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount                 $ 50,000,000         $ 50,000,000
Dividends       15,700,000                    
Total dividend income       1,400,000                    
Fair value 1,212,132,000 1,209,063,000   $ 1,212,132,000   $ 1,209,063,000                
Interest-earning assets, average yield       9.20%   8.60%                
Thompson Rivers LLC                            
Summary of Investment Holdings [Line Items]                            
Total dividend income       $ 0 3,200,000                  
Fair value 664,111,000 890,911,000   664,111,000   $ 890,911,000                
Cost $ 696,008,000 $ 949,279,000   696,008,000   $ 949,279,000                
Distributions of realized gains       $ 9,100,000                    
Investment owned, outstanding loans | loan 4,028 5,414   4,028   5,414                
Investment owned, weighted average coupon rate 4.00% 4.00%   4.00%   4.00%                
Investment owned, average unpaid balance $ 200,000 $ 200,000   $ 200,000   $ 200,000                
Thompson Rivers LLC | JPMorgan Chase Bank                            
Summary of Investment Holdings [Line Items]                            
Repurchase agreement counterparty, amount at risk 171,300,000 224,200,000   171,300,000   224,200,000                
Thompson Rivers LLC | Bank of America N.A.,                            
Summary of Investment Holdings [Line Items]                            
Repurchase agreement counterparty, amount at risk 311,600,000 428,000,000   311,600,000   428,000,000                
Thompson Rivers LLC | Barclays Bank                            
Summary of Investment Holdings [Line Items]                            
Repurchase agreement counterparty, amount at risk $ 104,400,000 $ 184,200,000   104,400,000   $ 184,200,000                
Waccamaw River, LLC                            
Summary of Investment Holdings [Line Items]                            
Total dividend income       $ 700,000 300,000                  
Investment owned, outstanding loans | loan 20,755,000 18,335   20,755,000   18,335                
Investment company, remaining average life to maturity       43 months 10 days   44 months                
Average loan amount $ 11,329 $ 11,542   $ 11,329   $ 11,542                
Investment company, weighted average interest rate       12.30%   12.00%                
Sierra JV                            
Summary of Investment Holdings [Line Items]                            
Dividends       $ 1,400,000                    
Total dividend income       1,200,000                    
Fair value 106,251,000 110,047,000   106,251,000   $ 110,047,000                
Cost $ 119,673,000 $ 125,220,000   $ 119,673,000   $ 125,220,000                
Weighted average yield 9.60% 9.20%   9.60%   9.20%                
Rocade Holdings LLC                            
Summary of Investment Holdings [Line Items]                            
Fair value             $ 45,000,000              
Investment in joint ventures                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments         89,300,000                  
Investment in joint ventures | Jocassee Partners LLC                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 48,651,000 $ 61,028,000   $ 48,651,000   $ 61,028,000                
Cost 63,690,000 75,941,000   63,690,000   75,941,000                
Short-term investments                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments       179,634,000 335,519,000                  
Repayments received/sales of portfolio investments       69,515,000 210,493,000                  
Short-term investments | Jocassee Partners LLC                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,222,078,000 1,219,889,000   1,222,078,000   1,219,889,000                
Cost 1,282,251,000 1,296,355,000   1,282,251,000   1,296,355,000                
Ginnie Mae Early Buyout Loans | Thompson Rivers LLC                            
Summary of Investment Holdings [Line Items]                            
Fair value 664,100,000 890,900,000   664,100,000   890,900,000                
Cash and Cash Equivalents | Thompson Rivers LLC                            
Summary of Investment Holdings [Line Items]                            
Fair value 29,800,000 65,100,000   29,800,000   65,100,000                
Cash and Cash Equivalents | Waccamaw River, LLC                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,700,000 8,000,000   9,700,000   8,000,000                
Consumer Loan | Waccamaw River, LLC                            
Summary of Investment Holdings [Line Items]                            
Fair value 220,200,000 $ 200,500,000   220,200,000   $ 200,500,000                
Revolving Line Of Credit | Eclipse Business Capital Holdings LLC | Minimum                            
Summary of Investment Holdings [Line Items]                            
Investment owned, face amount 10,000,000     10,000,000                    
Revolving Line Of Credit | Eclipse Business Capital Holdings LLC | Maximum                            
Summary of Investment Holdings [Line Items]                            
Investment owned, face amount $ 125,000,000     125,000,000                    
Investment With Previous Commitment To Provide FInancing                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments       $ 16,700,000                    
Investment, Excluding Short Term Investment, With Previous Commitment To Provide Financing                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments         30,500,000                  
Investment Denominated In Canadian Dollars                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 2 2   2   2                
Investment Denominated In Danish Kroner                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 1 1   1   1                
Investment Denominated In Australian Dollars                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 11 11   11   11                
Investment Denominated In New Zealand Dollars                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 2 2   2   2                
Investment Denominated In Norwegian Krone                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 1 1   1   1                
Investment Denominated In Swiss Francs                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 1 1   1   1                
Investment Denominated In Swedish Krone                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 1 1   1   1                
Investment Denominated In Euros                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 63 58   63   58                
Investment Denominated In British Pounds Sterling                            
Summary of Investment Holdings [Line Items]                            
Number of investments | investment 29 28   29   28                
Investments With No Previous Contractual Commitment To Provide Financing                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments       $ 128,000,000 741,900,000                  
Additional Investments In Joint Ventures                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments         11,700,000                  
Equity Co-Investments                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments       45,000,000                    
Sierra Merger                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments       $ 33,900,000                    
Sierra Acquisition                            
Summary of Investment Holdings [Line Items]                            
Purchases of portfolio investments         $ 442,200,000                  
Number of portfolio companies | investment 5 4   5   4                
MVC Acquisition                            
Summary of Investment Holdings [Line Items]                            
Number of portfolio companies | investment 2 2   2   2                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 0 [1],[2],[4],[5],[6] $ 0 [7],[8],[9],[10],[11]   $ 0 [1],[2],[4],[5],[6]   $ 0 [7],[8],[9],[10],[11]                
Cost 419,000 [1],[2],[4],[5],[6] 419,000 [7],[8],[9],[10],[11]   419,000 [1],[2],[4],[5],[6]   419,000 [7],[8],[9],[10],[11]                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,104,000 [1],[2],[4],[5],[6] 1,263,000 [7],[8],[9],[10],[11]   1,104,000 [1],[2],[4],[5],[6]   1,263,000 [7],[8],[9],[10],[11]                
Cost 1,498,000 [1],[2],[4],[5],[6] 1,498,000 [7],[8],[9],[10],[11]   1,498,000 [1],[2],[4],[5],[6]   1,498,000 [7],[8],[9],[10],[11]                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, Warrants                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Cost 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 0   0   0       $ 0        
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,104,000 1,263,000   1,104,000   1,263,000       0        
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Warrants                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 0   0   0       0        
Investment, Identifier [Axis]: 1WorldSync, Inc., IT Consulting & Other Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 16,225,000 [1],[2],[3] 16,307,000 [7],[10],[14]   16,225,000 [1],[2],[3]   16,307,000 [7],[10],[14]                
Cost 16,059,000 [1],[2],[3] 16,124,000 [7],[10],[14]   16,059,000 [1],[2],[3]   16,124,000 [7],[10],[14]                
Investment, Identifier [Axis]: A.T. Holdings II LTD, Other Financial, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 12,500,000 [2],[15] 12,500,000 [10],[16]   12,500,000 [2],[15]   12,500,000 [10],[16]                
Cost 12,500,000 [2],[15] 12,500,000 [10],[16]   12,500,000 [2],[15]   12,500,000 [10],[16]                
Investment, Identifier [Axis]: ADB Safegate, Aerospace & Defense, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[6],[15] 4,721,000 4,180,000   4,721,000   4,180,000                
Cost [1],[2],[6],[15] 5,396,000 5,184,000   5,396,000   5,184,000                
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 557,000 [2],[12] 798,000 [10],[13]   557,000 [2],[12]   798,000 [10],[13]                
Cost 349,000 [2],[12] 349,000 [10],[13]   349,000 [2],[12]   349,000 [10],[13]                
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,260,000 [1],[2],[6] 6,215,000 [7],[10],[11]   6,260,000 [1],[2],[6]   6,215,000 [7],[10],[11]                
Cost 6,343,000 [1],[2],[6] 6,339,000 [7],[10],[11]   6,343,000 [1],[2],[6]   6,339,000 [7],[10],[11]                
Investment, Identifier [Axis]: AMMC CLO 22, Limited Series 2018-22A, Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,976,000 [4],[15] 3,190,000 [8],[16]   2,976,000 [4],[15]   3,190,000 [8],[16]                
Cost 4,421,000 [4],[15] 4,445,000 [8],[16]   4,421,000 [4],[15]   4,445,000 [8],[16]                
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,210,000 [4],[15] 1,423,000 [8],[16]   1,210,000 [4],[15]   1,423,000 [8],[16]                
Cost 1,843,000 [4],[15] 1,860,000 [8],[16]   1,843,000 [4],[15]   1,860,000 [8],[16]                
Investment, Identifier [Axis]: APC1 Holding, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 354,000   0   354,000                
Investment, Identifier [Axis]: APC1 Holding, Diversified Manufacturing, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,446,000 [1],[2],[15],[17] 2,044,000 [7],[10],[16],[18]   2,446,000 [1],[2],[15],[17]   2,044,000 [7],[10],[16],[18]                
Cost 2,306,000 [1],[2],[15],[17] 1,952,000 [7],[10],[16],[18]   2,306,000 [1],[2],[15],[17]   1,952,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: APOG Bidco Pty Ltd, Healthcare, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,020,000 [1],[2],[15],[19] 2,073,000 [7],[10],[16],[20]   2,020,000 [1],[2],[15],[19]   2,073,000 [7],[10],[16],[20]                
Cost 2,280,000 [1],[2],[15],[19] 2,279,000 [7],[10],[16],[20]   2,280,000 [1],[2],[15],[19]   2,279,000 [7],[10],[16],[20]                
Investment, Identifier [Axis]: AQA Acquisition Holding, Inc., High Tech Industries, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 19,400,000 [1],[2],[6] 19,140,000 [7],[10],[11]   19,400,000 [1],[2],[6]   19,140,000 [7],[10],[11]                
Cost 19,578,000 [1],[2],[6] 19,564,000 [7],[10],[11]   19,578,000 [1],[2],[6]   19,564,000 [7],[10],[11]                
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Class A Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 686,000 [2] 620,000 [10],[13]   686,000 [2]   620,000 [10],[13]                
Cost 539,000 [2] 539,000 [10],[13]   539,000 [2]   539,000 [10],[13]                
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 20,141,000 [1],[2],[21] 20,920,000 [7],[10],[22]   20,141,000 [1],[2],[21]   20,920,000 [7],[10],[22]                
Cost 20,101,000 [1],[2],[21] 20,920,000 [7],[10],[22]   20,101,000 [1],[2],[21]   20,920,000 [7],[10],[22]                
Investment, Identifier [Axis]: ASC Communications, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,322,000 [1],[2],[21] 8,367,000 [7],[10],[11]   8,322,000 [1],[2],[21]   8,367,000 [7],[10],[11]                
Cost 8,262,000 [1],[2],[21] 8,302,000 [7],[10],[11]   8,262,000 [1],[2],[21]   8,302,000 [7],[10],[11]                
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,146,000 [1],[2],[23] 8,125,000 [7],[10],[24]   8,146,000 [1],[2],[23]   8,125,000 [7],[10],[24]                
Cost 8,115,000 [1],[2],[23] 8,129,000 [7],[10],[24]   8,115,000 [1],[2],[23]   8,129,000 [7],[10],[24]                
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (33,000) [1],[2],[23] (42,000) [7],[10],[24]   (33,000) [1],[2],[23]   (42,000) [7],[10],[24]                
Cost (39,000) [1],[2],[23] (41,000) [7],[10],[24]   (39,000) [1],[2],[23]   (41,000) [7],[10],[24]                
Investment, Identifier [Axis]: ATL II MRO Holdings, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,615,000 [1],[6] 4,416,000 [7],[25]   4,615,000 [1],[6]   4,416,000 [7],[25]                
Cost $ 4,530,000 [1],[6] $ 4,505,000 [7],[25]   $ 4,530,000 [1],[6]   $ 4,505,000 [7],[25]                
Investment, interest rate, paid in kind 0.30% [1],[6] 0.30% [7],[25]   0.30% [1],[6]   0.30% [7],[25]                
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 724,000 [1],[26] $ 685,000 [7],[25]   $ 724,000 [1],[26]   $ 685,000 [7],[25]                
Cost $ 705,000 [1],[26] $ 700,000 [7],[25]   $ 705,000 [1],[26]   $ 700,000 [7],[25]                
Investment, interest rate, paid in kind 1.00% [1],[26] 1.00% [7],[25]   1.00% [1],[26]   1.00% [7],[25]                
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 3                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 6,040,000 $ 5,919,000   $ 6,040,000   $ 5,919,000                
Cost $ 5,710,000 $ 5,703,000   $ 5,710,000   $ 5,703,000                
Investment, interest rate, paid in kind 10.00% 10.00%   10.00%   10.00%                
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class A Convertible Preferred Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 5,523,000 [2],[12] $ 5,403,000 [10],[13]   $ 5,523,000 [2],[12]   $ 5,403,000 [10],[13]                
Cost 5,000,000 [2],[12] 5,000,000 [10],[13]   5,000,000 [2],[12]   5,000,000 [10],[13]                
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class B Convertible Preferred Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,735,000 [2],[12] 1,667,000 [10],[13]   1,735,000 [2],[12]   1,667,000 [10],[13]                
Cost 1,667,000 [2],[12] 1,667,000 [10],[13]   1,667,000 [2],[12]   1,667,000 [10],[13]                
Investment, Identifier [Axis]: Accelerate Learning, Inc., Education Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[11]   7,480,000       7,480,000                
Cost [7],[10],[11]   7,511,000       7,511,000                
Investment, Identifier [Axis]: Acclime Holdings HK Limited, Business services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [27] 2,442,000 [1],[2],[15] 2,436,000 [7],[10],[16]   2,442,000 [1],[2],[15]   2,436,000 [7],[10],[16]                
Cost [27] 2,450,000 [1],[2],[15] 2,447,000 [7],[10],[16]   2,450,000 [1],[2],[15]   2,447,000 [7],[10],[16]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 328,000 [2],[12] 436,000 [10],[13]   328,000 [2],[12]   436,000 [10],[13]                
Cost 438,000 [2],[12] 438,000 [10],[13]   438,000 [2],[12]   438,000 [10],[13]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,711,000 [1],[2],[6] 12,069,000 [7],[10],[11]   11,711,000 [1],[2],[6]   12,069,000 [7],[10],[11]                
Cost 12,065,000 [1],[2],[6] 12,099,000 [7],[10],[11]   12,065,000 [1],[2],[6]   12,099,000 [7],[10],[11]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,286,000 [1],[2],[26] 1,116,000 [7],[10],[11]   1,286,000 [1],[2],[26]   1,116,000 [7],[10],[11]                
Cost 1,354,000 [1],[2],[26] 1,122,000 [7],[10],[11]   1,354,000 [1],[2],[26]   1,122,000 [7],[10],[11]                
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 922,000 1,152,000   922,000   1,152,000                
Investment, Identifier [Axis]: Acogroup, Business Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,250,000 [1],[2],[15],[28] 7,276,000 [7],[10],[16],[29]   7,250,000 [1],[2],[15],[28]   7,276,000 [7],[10],[16],[29]                
Cost 7,791,000 [1],[2],[15],[28] 7,782,000 [7],[10],[16],[29]   7,791,000 [1],[2],[15],[28]   7,782,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A1 Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 671,000 [2],[12] 671,000 [10],[13]   671,000 [2],[12]   671,000 [10],[13]                
Cost 280,000 [2],[12] 280,000 [10],[13]   280,000 [2],[12]   280,000 [10],[13]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A2 Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 173,000 [2],[12] 173,000 [10],[13]   173,000 [2],[12]   173,000 [10],[13]                
Cost 72,000 [2],[12] 72,000 [10],[13]   72,000 [2],[12]   72,000 [10],[13]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B1 Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Cost 9,000 [2],[12] 9,000 [10],[13]   9,000 [2],[12]   9,000 [10],[13]                
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B2 Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Cost 2,000 [2],[12] 2,000 [10],[13]   2,000 [2],[12]   2,000 [10],[13]                
Investment, Identifier [Axis]: Air Canada 2020-2 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,920,000 4,816,000   4,920,000   4,816,000                
Cost 4,841,000 4,841,000   4,841,000   4,841,000                
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 12,711,000 [1],[2],[27] 12,722,000 [7],[10],[11]   12,711,000 [1],[2],[27]   12,722,000 [7],[10],[11]                
Cost 12,650,000 [1],[2],[27] 12,671,000 [7],[10],[11]   12,650,000 [1],[2],[27]   12,671,000 [7],[10],[11]                
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,055,000 0   2,055,000   0                
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Insurance, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[15],[17] 2,901,000     2,901,000                    
Cost [1],[2],[15],[17] 2,865,000     2,865,000                    
Investment, Identifier [Axis]: Alpine SG, LLC, High Tech Industries, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 22,677,000 [1],[2],[4],[21] 22,677,000 [7],[8],[10],[22]   22,677,000 [1],[2],[4],[21]   22,677,000 [7],[8],[10],[22]                
Cost 22,678,000 [1],[2],[4],[21] 22,678,000 [7],[8],[10],[22]   22,678,000 [1],[2],[4],[21]   22,678,000 [7],[8],[10],[22]                
Investment, Identifier [Axis]: Alpine US Bidco LLC, Agricultural Products, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 16,704,000 [1],[26] 16,704,000 [7],[25]   16,704,000 [1],[26]   16,704,000 [7],[25]                
Cost 17,705,000 [1],[26] 17,692,000 [7],[25]   17,705,000 [1],[26]   17,692,000 [7],[25]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Class B Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,152,000 [2],[12],[15] 1,121,000 [10],[13],[16]   1,152,000 [2],[12],[15]   1,121,000 [10],[13],[16]                
Cost 1,040,000 [2],[12],[15] 1,040,000 [10],[13],[16]   1,040,000 [2],[12],[15]   1,040,000 [10],[13],[16]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Subordinated Loan Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,322,000 [2],[6],[15] 4,303,000 [10],[11],[16]   4,322,000 [2],[6],[15]   4,303,000 [10],[11],[16]                
Cost $ 4,450,000 [2],[6],[15] $ 4,451,000 [10],[11],[16]   $ 4,450,000 [2],[6],[15]   $ 4,451,000 [10],[11],[16]                
Investment, interest rate, paid in kind 9.00% [2],[6],[15] 9.00% [10],[11],[16]   9.00% [2],[6],[15]   9.00% [10],[11],[16]                
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrant                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 621,000 [2],[12],[15] $ 426,000 [10],[13],[16]   $ 621,000 [2],[12],[15]   $ 426,000 [10],[13],[16]                
Cost 4,000 [2],[12],[15] 4,000 [10],[13],[16]   4,000 [2],[12],[15]   4,000 [10],[13],[16]                
Investment, Identifier [Axis]: Amtech LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,527,000 1,527,000   1,527,000   1,527,000                
Investment, Identifier [Axis]: Amtech LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 682,000 545,000   682,000   545,000                
Investment, Identifier [Axis]: Amtech LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,222,000 [1],[2],[26] 2,222,000 [7],[10],[25]   2,222,000 [1],[2],[26]   2,222,000 [7],[10],[25]                
Cost 2,203,000 [1],[2],[26] 2,205,000 [7],[10],[25]   2,203,000 [1],[2],[26]   2,205,000 [7],[10],[25]                
Investment, Identifier [Axis]: Amtech LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (7,000) [1],[2],[26] 128,000 [7],[10],[25]   (7,000) [1],[2],[26]   128,000 [7],[10],[25]                
Cost (10,000) [1],[2],[26] 125,000 [7],[10],[25]   (10,000) [1],[2],[26]   125,000 [7],[10],[25]                
Investment, Identifier [Axis]: Anagram Holdings, LLC, Chemicals, Plastics, & Rubber, First Lien Senior Secured Note                            
Summary of Investment Holdings [Line Items]                            
Fair value 15,037,000 14,368,000   15,037,000   14,368,000                
Cost $ 14,826,000 $ 14,392,000   $ 14,826,000   $ 14,392,000                
Investment, interest rate, paid in kind 5.00% 5.00%   5.00%   5.00%                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Bridge Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 373,000 $ 366,000   $ 373,000   $ 366,000                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,060,000 [1],[2],[15],[17] 2,330,000 [7],[10],[16],[18]   3,060,000 [1],[2],[15],[17]   2,330,000 [7],[10],[16],[18]                
Cost 3,174,000 [1],[2],[15],[17] 2,382,000 [7],[10],[16],[18]   3,174,000 [1],[2],[15],[17]   2,382,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,637,000 [1],[2],[15],[17] 723,000 [7],[10],[16],[18]   5,637,000 [1],[2],[15],[17]   723,000 [7],[10],[16],[18]                
Cost 5,750,000 [1],[2],[15],[17] 790,000 [7],[10],[16],[18]   5,750,000 [1],[2],[15],[17]   790,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,617,000 [1],[2],[15],[17] 5,623,000 [7],[10],[16],[18]   1,617,000 [1],[2],[15],[17]   5,623,000 [7],[10],[16],[18]                
Cost 1,579,000 [1],[2],[15],[17] 5,745,000 [7],[10],[16],[18]   1,579,000 [1],[2],[15],[17]   5,745,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 3                            
Summary of Investment Holdings [Line Items]                            
Fair value 982,000 [1],[2],[6],[15] 997,000 [7],[10],[11],[16]   982,000 [1],[2],[6],[15]   997,000 [7],[10],[11],[16]                
Cost 1,019,000 [1],[2],[6],[15] 1,019,000 [7],[10],[11],[16]   1,019,000 [1],[2],[6],[15]   1,019,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (13,000) [1],[2],[15],[17] (8,000) [7],[10],[16],[18]   (13,000) [1],[2],[15],[17]   (8,000) [7],[10],[16],[18]                
Cost (4,000) [1],[2],[15],[17] (5,000) [7],[10],[16],[18]   (4,000) [1],[2],[15],[17]   (5,000) [7],[10],[16],[18]                
Investment, Identifier [Axis]: Anju Software, Inc., Application Software, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,884,000 [1],[2],[26] 11,006,000 [7],[10],[25]   10,884,000 [1],[2],[26]   11,006,000 [7],[10],[25]                
Cost 13,248,000 [1],[2],[26] 13,269,000 [7],[10],[25]   13,248,000 [1],[2],[26]   13,269,000 [7],[10],[25]                
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,802,000 [1],[2],[15],[30] 1,753,000 [7],[10],[16],[31]   1,802,000 [1],[2],[15],[30]   1,753,000 [7],[10],[16],[31]                
Cost 1,878,000 [1],[2],[15],[30] 1,876,000 [7],[10],[16],[31]   1,878,000 [1],[2],[15],[30]   1,876,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, Subordinated Senior Unsecured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 264,000 [2],[15] 266,000 [10],[16]   264,000 [2],[15]   266,000 [10],[16]                
Cost $ 291,000 [2],[15] $ 285,000 [10],[16]   $ 291,000 [2],[15]   $ 285,000 [10],[16]                
Investment, interest rate, paid in kind 8.00% [2],[15] 8.00% [10],[16]   8.00% [2],[15]   8.00% [10],[16]                
Investment, Identifier [Axis]: Apidos CLO XXIV, Series 2016-24A, Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 6,035,000 [4],[15] $ 6,635,000 [8],[16]   $ 6,035,000 [4],[15]   $ 6,635,000 [8],[16]                
Cost 6,753,000 [4],[15] 6,934,000 [8],[16]   6,753,000 [4],[15]   6,934,000 [8],[16]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[12],[15] 6,000 [10],[13],[16]   0 [2],[12],[15]   6,000 [10],[13],[16]                
Cost 12,000 [2],[12],[15] 12,000 [10],[13],[16]   12,000 [2],[12],[15]   12,000 [10],[13],[16]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,104,000 [1],[2],[15],[28] 5,085,000 [7],[10],[16],[32]   2,104,000 [1],[2],[15],[28]   5,085,000 [7],[10],[16],[32]                
Cost 2,607,000 [1],[2],[15],[28] 5,466,000 [7],[10],[16],[32]   2,607,000 [1],[2],[15],[28]   5,466,000 [7],[10],[16],[32]                
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 21,000 [2],[12],[15] 110,000 [10],[13],[16]   21,000 [2],[12],[15]   110,000 [10],[13],[16]                
Cost 120,000 [2],[12],[15] 120,000 [10],[13],[16]   120,000 [2],[12],[15]   120,000 [10],[13],[16]                
Investment, Identifier [Axis]: Apus Bidco Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,480,000 [1],[2],[15],[33] 3,344,000 [7],[10],[16],[34]   3,480,000 [1],[2],[15],[33]   3,344,000 [7],[10],[16],[34]                
Cost 3,889,000 [1],[2],[15],[33] 3,886,000 [7],[10],[16],[34]   3,889,000 [1],[2],[15],[33]   3,886,000 [7],[10],[16],[34]                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Capex / Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,155,000 2,543,000   2,155,000   2,543,000                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,923,000 [1],[2],[15],[33] 5,263,000 [7],[10],[16],[34]   5,923,000 [1],[2],[15],[33]   5,263,000 [7],[10],[16],[34]                
Cost 6,451,000 [1],[2],[15],[33] 5,806,000 [7],[10],[16],[34]   6,451,000 [1],[2],[15],[33]   5,806,000 [7],[10],[16],[34]                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[16],[34]   198,000       198,000                
Cost [7],[10],[16],[34]   175,000       175,000                
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,478,000 [1],[2],[15],[33] 1,475,000 [7],[10],[16],[34]   1,478,000 [1],[2],[15],[33]   1,475,000 [7],[10],[16],[34]                
Cost 1,618,000 [1],[2],[15],[33] 1,617,000 [7],[10],[16],[34]   1,618,000 [1],[2],[15],[33]   1,617,000 [7],[10],[16],[34]                
Investment, Identifier [Axis]: Arc Education, Consumer Cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,033,000 [1],[2],[15],[17] 2,969,000 [7],[10],[16],[18]   3,033,000 [1],[2],[15],[17]   2,969,000 [7],[10],[16],[18]                
Cost 2,797,000 [1],[2],[15],[17] 2,794,000 [7],[10],[16],[18]   2,797,000 [1],[2],[15],[17]   2,794,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Arc Education, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,934,000 1,900,000   1,934,000   1,900,000                
Investment, Identifier [Axis]: Arch Global Precision LLC, Industrial Machinery, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,102,000 [1],[2],[6] 9,094,000 [7],[10],[11]   9,102,000 [1],[2],[6]   9,094,000 [7],[10],[11]                
Cost 9,151,000 [1],[2],[6] 9,151,000 [7],[10],[11]   9,151,000 [1],[2],[6]   9,151,000 [7],[10],[11]                
Investment, Identifier [Axis]: Archimede, Consumer Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,288,000 [1],[2],[15],[17] 6,164,000 [7],[10],[16],[18]   6,288,000 [1],[2],[15],[17]   6,164,000 [7],[10],[16],[18]                
Cost 6,479,000 [1],[2],[15],[17] 6,474,000 [7],[10],[16],[18]   6,479,000 [1],[2],[15],[17]   6,474,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Argus Bidco Limited, CAF Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 674,000 789,000   674,000   789,000                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value [12] 0 [2],[15] 0 [10],[16]   0 [2],[15]   0 [10],[16]                
Cost [12] 1,000 [2],[15] 1,000 [10],[16]   1,000 [2],[15]   1,000 [10],[16]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Equity Loan Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 53,000 [2],[15] 50,000 [10],[16]   53,000 [2],[15]   50,000 [10],[16]                
Cost $ 51,000 [2],[15] $ 51,000 [10],[16]   $ 51,000 [2],[15]   $ 51,000 [10],[16]                
Investment, interest rate, paid in kind 10.00% [2],[15] 10.00% [10],[16]   10.00% [2],[15]   10.00% [10],[16]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 126,000 [1],[2],[3],[15] $ 126,000 [7],[10],[14],[16]   $ 126,000 [1],[2],[3],[15]   $ 126,000 [7],[10],[14],[16]                
Cost 126,000 [1],[2],[3],[15] 126,000 [7],[10],[14],[16]   126,000 [1],[2],[3],[15]   126,000 [7],[10],[14],[16]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,582,000 [1],[2],[15],[30] 1,536,000 [7],[10],[16],[31]   1,582,000 [1],[2],[15],[30]   1,536,000 [7],[10],[16],[31]                
Cost 1,519,000 [1],[2],[15],[30] 1,514,000 [7],[10],[16],[31]   1,519,000 [1],[2],[15],[30]   1,514,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,708,000 [1],[2],[15],[17] 1,547,000 [7],[10],[16],[18]   1,708,000 [1],[2],[15],[17]   1,547,000 [7],[10],[16],[18]                
Cost 1,635,000 [1],[2],[15],[17] 1,502,000 [7],[10],[16],[18]   1,635,000 [1],[2],[15],[17]   1,502,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 53,000 [2],[15] 50,000 [10],[16]   53,000 [2],[15]   50,000 [10],[16]                
Cost $ 51,000 [2],[15] $ 51,000 [10],[16]   $ 51,000 [2],[15]   $ 51,000 [10],[16]                
Investment, interest rate, paid in kind 10.00% [2],[15] 10.00% [10],[16]   10.00% [2],[15]   10.00% [10],[16]                
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 535,000 [2],[15] $ 487,000 [10],[16]   $ 535,000 [2],[15]   $ 487,000 [10],[16]                
Cost $ 512,000 [2],[15] $ 480,000 [10],[16]   $ 512,000 [2],[15]   $ 480,000 [10],[16]                
Investment, interest rate, paid in kind 10.50% [2],[15] 10.50% [10],[16]   10.50% [2],[15]   10.50% [10],[16]                
Investment, Identifier [Axis]: Argus Bidco Limited, RCF Bridge Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 172,000 $ 168,000   $ 172,000   $ 168,000                
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,899,000 [1],[2],[6] 3,896,000 [7],[10],[11]   3,899,000 [1],[2],[6]   3,896,000 [7],[10],[11]                
Cost 3,936,000 [1],[2],[6] 3,950,000 [7],[10],[11]   3,936,000 [1],[2],[6]   3,950,000 [7],[10],[11]                
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,949,000 [1],[2],[23] 4,932,000 [7],[10],[24]   4,949,000 [1],[2],[23]   4,932,000 [7],[10],[24]                
Cost 4,962,000 [1],[2],[23] 4,946,000 [7],[10],[24]   4,962,000 [1],[2],[23]   4,946,000 [7],[10],[24]                
Investment, Identifier [Axis]: Astra Bidco Limited, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 901,000 876,000   901,000   876,000                
Investment, Identifier [Axis]: Astra Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,971,000 [1],[2],[15],[30] 1,886,000 [7],[10],[16],[31]   1,971,000 [1],[2],[15],[30]   1,886,000 [7],[10],[16],[31]                
Cost 2,106,000 [1],[2],[15],[30] 2,103,000 [7],[10],[16],[31]   2,106,000 [1],[2],[15],[30]   2,103,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,331,000 [1],[2],[15],[28] 1,305,000 [7],[10],[16],[29]   1,331,000 [1],[2],[15],[28]   1,305,000 [7],[10],[16],[29]                
Cost 1,528,000 [1],[2],[15],[28] 1,526,000 [7],[10],[16],[29]   1,528,000 [1],[2],[15],[28]   1,526,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 725,000 [1],[2],[15],[33] 704,000 [7],[10],[16],[31]   725,000 [1],[2],[15],[33]   704,000 [7],[10],[16],[31]                
Cost 902,000 [1],[2],[15],[33] 901,000 [7],[10],[16],[31]   902,000 [1],[2],[15],[33]   901,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,280,000 1,295,000   1,280,000   1,295,000                
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,292,000 [1],[2],[15],[35] 2,298,000 [7],[10],[16],[36]   2,292,000 [1],[2],[15],[35]   2,298,000 [7],[10],[16],[36]                
Cost 2,421,000 [1],[2],[15],[35] 2,417,000 [7],[10],[16],[36]   2,421,000 [1],[2],[15],[35]   2,417,000 [7],[10],[16],[36]                
Investment, Identifier [Axis]: Aviation Technical Services, Inc., Aerospace & Defense, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 28,398,000 [1],[2],[4],[26] 27,794,000 [7],[8],[10],[25]   28,398,000 [1],[2],[4],[26]   27,794,000 [7],[8],[10],[25]                
Cost $ 27,635,000 [1],[2],[4],[26] $ 27,165,000 [7],[8],[10],[25]   $ 27,635,000 [1],[2],[4],[26]   $ 27,165,000 [7],[8],[10],[25]                
Investment, interest rate, paid in kind 6.50% [1],[2],[4],[26] 6.50% [7],[8],[10],[25]   6.50% [1],[2],[4],[26]   6.50% [7],[8],[10],[25]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 962,000 $ 962,000   $ 962,000   $ 962,000                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 481,000 481,000   481,000   481,000                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 172,000 [2],[12] 183,000 [10],[13]   172,000 [2],[12]   183,000 [10],[13]                
Cost 192,000 [2],[12] 192,000 [10],[13]   192,000 [2],[12]   192,000 [10],[13]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,487,000 [1],[2],[6] 4,489,000 [7],[10],[11]   4,487,000 [1],[2],[6]   4,489,000 [7],[10],[11]                
Cost 4,460,000 [1],[2],[6] 4,467,000 [7],[10],[11]   4,460,000 [1],[2],[6]   4,467,000 [7],[10],[11]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (5,000) [1],[2],[6] (6,000) [7],[10],[11]   (5,000) [1],[2],[6]   (6,000) [7],[10],[11]                
Cost (8,000) [1],[2],[6] (8,000) [7],[10],[11]   (8,000) [1],[2],[6]   (8,000) [7],[10],[11]                
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,448,000 [2] 1,403,000 [10]   1,448,000 [2]   1,403,000 [10]                
Cost $ 1,453,000 [2] $ 1,409,000 [10]   $ 1,453,000 [2]   $ 1,409,000 [10]                
Investment, interest rate, paid in kind 12.00% [2] 12.00% [10]   12.00% [2]   12.00% [10]                
Investment, Identifier [Axis]: BPG Holdings IV Corp, Capital Goods, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] $ 13,536,000     $ 13,536,000                    
Cost [1],[2],[3] 13,538,000     13,538,000                    
Investment, Identifier [Axis]: BVI Medical, Inc., Healthcare, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,778,000 [1],[2],[17] $ 9,495,000 [7],[10],[18]   9,778,000 [1],[2],[17]   $ 9,495,000 [7],[10],[18]                
Cost 9,425,000 [1],[2],[17] 9,404,000 [7],[10],[18]   9,425,000 [1],[2],[17]   9,404,000 [7],[10],[18]                
Investment, Identifier [Axis]: Bariacum S.A, Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,064,000 2,028,000   2,064,000   2,028,000                
Investment, Identifier [Axis]: Bariacum S.A, Consumer Products, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,127,000 [1],[2],[15],[28] 5,944,000 [7],[10],[16],[29]   6,127,000 [1],[2],[15],[28]   5,944,000 [7],[10],[16],[29]                
Cost 6,271,000 [1],[2],[15],[28] 6,264,000 [7],[10],[16],[29]   6,271,000 [1],[2],[15],[28]   6,264,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Benify (Bennevis AB), High Tech Industries, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,065,000 [1],[2],[15],[37] 1,060,000 [7],[10],[16],[38]   1,065,000 [1],[2],[15],[37]   1,060,000 [7],[10],[16],[38]                
Cost 1,162,000 [1],[2],[15],[37] 1,161,000 [7],[10],[16],[38]   1,162,000 [1],[2],[15],[37]   1,161,000 [7],[10],[16],[38]                
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,495,000 [1],[2],[26] 2,493,000 [7],[10],[25]   2,495,000 [1],[2],[26]   2,493,000 [7],[10],[25]                
Cost 2,502,000 [1],[2],[26] 2,499,000 [7],[10],[25]   2,502,000 [1],[2],[26]   2,499,000 [7],[10],[25]                
Investment, Identifier [Axis]: Bidwax, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,445,000 [1],[2],[15],[28] 7,254,000 [7],[10],[16],[29]   7,445,000 [1],[2],[15],[28]   7,254,000 [7],[10],[16],[29]                
Cost 8,095,000 [1],[2],[15],[28] 8,089,000 [7],[10],[16],[29]   8,095,000 [1],[2],[15],[28]   8,089,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,504,000 [1],[2],[3],[15] 2,484,000 [7],[10],[14],[16]   2,504,000 [1],[2],[3],[15]   2,484,000 [7],[10],[14],[16]                
Cost 2,479,000 [1],[2],[3],[15] 2,476,000 [7],[10],[14],[16]   2,479,000 [1],[2],[3],[15]   2,476,000 [7],[10],[14],[16]                
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 820,000 [1],[2],[15],[30] 792,000 [7],[10],[16],[31]   820,000 [1],[2],[15],[30]   792,000 [7],[10],[16],[31]                
Cost 894,000 [1],[2],[15],[30] 893,000 [7],[10],[16],[31]   894,000 [1],[2],[15],[30]   893,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Biolam Group, Consumer Non-cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,732,000 [1],[2],[15],[17] 2,939,000 [7],[10],[16],[18]   3,732,000 [1],[2],[15],[17]   2,939,000 [7],[10],[16],[18]                
Cost 3,660,000 [1],[2],[15],[17] 2,956,000 [7],[10],[16],[18]   3,660,000 [1],[2],[15],[17]   2,956,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Biolam Group, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 4,152,000 4,783,000   4,152,000   4,783,000                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 417,000 417,000   417,000   417,000                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 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                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 8,808,000 $ 9,147,000   $ 8,808,000   $ 9,147,000       0        
Investment, interest rate, paid in kind 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                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 5,647,000 [1],[2],[4],[26] $ 5,647,000 [7],[8],[10],[25]   $ 5,647,000 [1],[2],[4],[26]   $ 5,647,000 [7],[8],[10],[25]                
Cost 5,647,000 [1],[2],[4],[26] 5,647,000 [7],[8],[10],[25]   5,647,000 [1],[2],[4],[26]   5,647,000 [7],[8],[10],[25]                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,808,000 [2],[4],[5] 9,147,000 [8],[9],[10]   8,808,000 [2],[4],[5]   9,147,000 [8],[9],[10]                
Cost $ 9,628,000 [2],[4],[5] $ 9,628,000 [8],[9],[10]   $ 9,628,000 [2],[4],[5]   $ 9,628,000 [8],[9],[10]                
Investment, interest rate, paid in kind 10.00% [2],[4],[5] 10.00% [8],[9],[10]   10.00% [2],[4],[5]   10.00% [8],[9],[10]                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 0 [2],[4],[12] $ 0 [8],[10],[13]   $ 0 [2],[4],[12]   $ 0 [8],[10],[13]                
Cost 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 0   0   0       0        
Investment, Identifier [Axis]: Bounteous, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,840,000 2,840,000   2,840,000   2,840,000                
Investment, Identifier [Axis]: Bounteous, Inc., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,529,000 [1],[2],[6] 1,735,000 [7],[10],[11]   1,529,000 [1],[2],[6]   1,735,000 [7],[10],[11]                
Cost 1,815,000 [1],[2],[6] 1,816,000 [7],[10],[11]   1,815,000 [1],[2],[6]   1,816,000 [7],[10],[11]                
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Municipal Revenue Bond                            
Summary of Investment Holdings [Line Items]                            
Fair value 28,525,000 28,300,000   28,525,000   28,300,000                
Cost 27,200,000 27,200,000   27,200,000   27,200,000                
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Preferred Stock- Series C                            
Summary of Investment Holdings [Line Items]                            
Fair value 14,854,000 [2] 14,731,000 [10]   14,854,000 [2]   14,731,000 [10]                
Cost $ 14,460,000 [2] $ 14,460,000 [10]   $ 14,460,000 [2]   $ 14,460,000 [10]                
Investment, interest rate, paid in kind 7.00% [2] 7.00% [10]   7.00% [2]   7.00% [10]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 4,701,000 [1],[2],[6] $ 4,724,000 [7],[10],[11]   $ 4,701,000 [1],[2],[6]   $ 4,724,000 [7],[10],[11]                
Cost 4,703,000 [1],[2],[6] 4,728,000 [7],[10],[11]   4,703,000 [1],[2],[6]   4,728,000 [7],[10],[11]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, LLC units                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,517,000 [2],[12] 1,152,000 [10],[13]   1,517,000 [2],[12]   1,152,000 [10],[13]                
Cost 1,107,000 [2],[12] 1,108,000 [10],[13]   1,107,000 [2],[12]   1,108,000 [10],[13]                
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,318,000 [1],[2],[6] (12,000) [7],[10],[11]   1,318,000 [1],[2],[6]   (12,000) [7],[10],[11]                
Cost 1,319,000 [1],[2],[6] (11,000) [7],[10],[11]   1,319,000 [1],[2],[6]   (11,000) [7],[10],[11]                
Investment, Identifier [Axis]: BrightSign LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 1,329,000   0   1,329,000                
Investment, Identifier [Axis]: Brightline Trains Florida LLC, Transportation, Senior Secured Note                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,400,000 [2] 4,350,000 [10]   4,400,000 [2]   4,350,000 [10]                
Cost 5,000,000 [2] 5,000,000 [10]   5,000,000 [2]   5,000,000 [10]                
Investment, Identifier [Axis]: Brightpay Limited, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 138,000 135,000   138,000   135,000                
Investment, Identifier [Axis]: Brightpay Limited, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,157,000 [1],[2],[15],[17] 2,156,000 [7],[10],[16],[18]   2,157,000 [1],[2],[15],[17]   2,156,000 [7],[10],[16],[18]                
Cost 2,298,000 [1],[2],[15],[17] 2,296,000 [7],[10],[16],[18]   2,298,000 [1],[2],[15],[17]   2,296,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: British Airways 2020-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                            
Summary of Investment Holdings [Line Items]                            
Fair value 691,000 692,000   691,000   692,000                
Cost 676,000 703,000   676,000   703,000                
Investment, Identifier [Axis]: British Engineering Services Holdco Limited, Commercial Services & Supplies, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 13,864,000 [1],[2],[15],[33] 13,454,000 [7],[10],[16],[31]   13,864,000 [1],[2],[15],[33]   13,454,000 [7],[10],[16],[31]                
Cost 15,146,000 [1],[2],[15],[33] 15,133,000 [7],[10],[16],[31]   15,146,000 [1],[2],[15],[33]   15,133,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Brook & Whittle Holding Corp., Containers, Packaging & Glass, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,568,000 [1],[3],[4] 2,478,000 [7],[8],[14]   2,568,000 [1],[3],[4]   2,478,000 [7],[8],[14]                
Cost 2,800,000 [1],[3],[4] 2,807,000 [7],[8],[14]   2,800,000 [1],[3],[4]   2,807,000 [7],[8],[14]                
Investment, Identifier [Axis]: Brown Machine Group Holdings, LLC, Industrial Equipment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,281,000 [1],[2],[6] 6,281,000 [7],[10],[11]   6,281,000 [1],[2],[6]   6,281,000 [7],[10],[11]                
Cost 6,256,000 [1],[2],[6] 6,252,000 [7],[10],[11]   6,256,000 [1],[2],[6]   6,252,000 [7],[10],[11]                
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, LP Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 478,000 [2],[12] 446,000 [10],[13]   478,000 [2],[12]   446,000 [10],[13]                
Cost 455,000 [2],[12] 455,000 [10],[13]   455,000 [2],[12]   455,000 [10],[13]                
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,405,000 [1],[2],[21] 4,390,000 [7],[10],[22]   4,405,000 [1],[2],[21]   4,390,000 [7],[10],[22]                
Cost 4,374,000 [1],[2],[21] 4,370,000 [7],[10],[22]   4,374,000 [1],[2],[21]   4,370,000 [7],[10],[22]                
Investment, Identifier [Axis]: CATAWBA RIVER LIMITED, Finance Companies, Structured - Junior Note                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,275,000 [2],[15] 5,239,000 [10],[16]   4,275,000 [2],[15]   5,239,000 [10],[16]                
Cost 4,883,000 [2],[15] 4,893,000 [10],[16]   4,883,000 [2],[15]   4,893,000 [10],[16]                
Investment, Identifier [Axis]: CAi Software, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 943,000 943,000   943,000   943,000                
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,330,000 [1],[2],[6] 1,341,000 [7],[10],[11]   1,330,000 [1],[2],[6]   1,341,000 [7],[10],[11]                
Cost 1,349,000 [1],[2],[6] 1,352,000 [7],[10],[11]   1,349,000 [1],[2],[6]   1,352,000 [7],[10],[11]                
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,837,000 [1],[2],[6] 4,879,000 [7],[10],[11]   4,837,000 [1],[2],[6]   4,879,000 [7],[10],[11]                
Cost 4,911,000 [1],[2],[6] 4,921,000 [7],[10],[11]   4,911,000 [1],[2],[6]   4,921,000 [7],[10],[11]                
Investment, Identifier [Axis]: CAi Software, LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (30,000) [1],[2],[6] (24,000) [7],[10],[11]   (30,000) [1],[2],[6]   (24,000) [7],[10],[11]                
Cost (15,000) [1],[2],[6] (16,000) [7],[10],[11]   (15,000) [1],[2],[6]   (16,000) [7],[10],[11]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,988,000 [1],[2],[26] 10,377,000 [7],[10],[25]   9,988,000 [1],[2],[26]   10,377,000 [7],[10],[25]                
Cost 10,098,000 [1],[2],[26] 10,510,000 [7],[10],[25]   10,098,000 [1],[2],[26]   10,510,000 [7],[10],[25]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,344,000 [1],[2],[3] 1,344,000 [7],[10],[14]   1,344,000 [1],[2],[3]   1,344,000 [7],[10],[14]                
Cost 1,342,000 [1],[2],[3] 1,344,000 [7],[10],[14]   1,342,000 [1],[2],[3]   1,344,000 [7],[10],[14]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,030,000 [2],[12] 1,027,000 [10],[13]   1,030,000 [2],[12]   1,027,000 [10],[13]                
Cost 551,000 [2],[12] 551,000 [10],[13]   551,000 [2],[12]   551,000 [10],[13]                
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (45,000) [1],[2],[26] (49,000) [7],[10],[25]   (45,000) [1],[2],[26]   (49,000) [7],[10],[25]                
Cost (28,000) [1],[2],[26] (29,000) [7],[10],[25]   (28,000) [1],[2],[26]   (29,000) [7],[10],[25]                
Investment, Identifier [Axis]: CGI Parent, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 18,220,000 [1],[2],[3] 18,060,000 [7],[10],[14]   18,220,000 [1],[2],[3]   18,060,000 [7],[10],[14]                
Cost 18,727,000 [1],[2],[3] 18,761,000 [7],[10],[14]   18,727,000 [1],[2],[3]   18,761,000 [7],[10],[14]                
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,951,000 [1],[2],[6] 3,928,000 [7],[10],[11]   3,951,000 [1],[2],[6]   3,928,000 [7],[10],[11]                
Cost 4,070,000 [1],[2],[6] 4,076,000 [7],[10],[11]   4,070,000 [1],[2],[6]   4,076,000 [7],[10],[11]                
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 104,000 [2],[12] 165,000 [10]   104,000 [2],[12]   165,000 [10]                
Cost 352,000 [2],[12] 352,000 [10]   352,000 [2],[12]   352,000 [10]                
Investment, Identifier [Axis]: CSL DualCom, Tele-communications, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,980,000 [1],[2],[15],[39] 1,921,000 [7],[10],[16],[40]   1,980,000 [1],[2],[15],[39]   1,921,000 [7],[10],[16],[40]                
Cost 1,907,000 [1],[2],[15],[39] 1,905,000 [7],[10],[16],[40]   1,907,000 [1],[2],[15],[39]   1,905,000 [7],[10],[16],[40]                
Investment, Identifier [Axis]: CSL Dualcom, Capex / Acquisition Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 146,000 142,000   146,000   142,000                
Investment, Identifier [Axis]: CT Technologies Intermediate Holdings, Inc., Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,676,000 [1],[4],[26] 4,505,000 [7],[8],[25]   4,676,000 [1],[4],[26]   4,505,000 [7],[8],[25]                
Cost 4,917,000 [1],[4],[26] 4,930,000 [7],[8],[25]   4,917,000 [1],[4],[26]   4,930,000 [7],[8],[25]                
Investment, Identifier [Axis]: CVL 3, Capital Equipment, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 909,000 [1],[2],[15],[17] 891,000 [7],[10],[16],[18]   909,000 [1],[2],[15],[17]   891,000 [7],[10],[16],[18]                
Cost 939,000 [1],[2],[15],[17] 938,000 [7],[10],[16],[18]   939,000 [1],[2],[15],[17]   938,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: CVL 3, Capital Equipment, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,124,000 [1],[2],[3],[15] 1,122,000 [7],[10],[14],[16]   1,124,000 [1],[2],[3],[15]   1,122,000 [7],[10],[14],[16]                
Cost 1,118,000 [1],[2],[3],[15] 1,117,000 [7],[10],[14],[16]   1,118,000 [1],[2],[3],[15]   1,117,000 [7],[10],[14],[16]                
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 243,000 [2],[12] 204,000 [10],[13]   243,000 [2],[12]   204,000 [10],[13]                
Cost 161,000 [2],[12] 161,000 [10],[13]   161,000 [2],[12]   161,000 [10],[13]                
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries,First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,765,000 [1],[2],[26] 2,766,000 [7],[10],[25]   2,765,000 [1],[2],[26]   2,766,000 [7],[10],[25]                
Cost 2,739,000 [1],[2],[26] 2,744,000 [7],[10],[25]   2,739,000 [1],[2],[26]   2,744,000 [7],[10],[25]                
Investment, Identifier [Axis]: Cadent, LLC (f/k/a Cross MediaWorks), Media & Entertainment, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,677,000 [1],[2],[6] 6,580,000 [7],[10],[11]   6,677,000 [1],[2],[6]   6,580,000 [7],[10],[11]                
Cost 6,744,000 [1],[2],[6] 6,741,000 [7],[10],[11]   6,744,000 [1],[2],[6]   6,741,000 [7],[10],[11]                
Investment, Identifier [Axis]: Cadent, LLC (f/k/a Cross MediaWorks), Media & Entertainment, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,080,000 [1],[2],[6] 11,080,000 [7],[10],[11]   11,080,000 [1],[2],[6]   11,080,000 [7],[10],[11]                
Cost 11,204,000 [1],[2],[6] 11,161,000 [7],[10],[11]   11,204,000 [1],[2],[6]   11,161,000 [7],[10],[11]                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 110,000   0   110,000                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class A Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[12],[15] 292,000 [10],[13],[16]   0 [2],[12],[15]   292,000 [10],[13],[16]                
Cost 389,000 [2],[12],[15] 389,000 [10],[13],[16]   389,000 [2],[12],[15]   389,000 [10],[13],[16]                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class C - Warrants                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[12],[15] 0 [10],[13],[16]   0 [2],[12],[15]   0 [10],[13],[16]                
Cost 0 [2],[12],[15] 0 [10],[13],[16]   0 [2],[12],[15]   0 [10],[13],[16]                
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,403,000 [1],[2],[15],[41] 1,468,000 [7],[10],[16],[42]   1,403,000 [1],[2],[15],[41]   1,468,000 [7],[10],[16],[42]                
Cost $ 1,732,000 [1],[2],[15],[41] 1,729,000 [7],[10],[16],[42]   $ 1,732,000 [1],[2],[15],[41]   1,729,000 [7],[10],[16],[42]                
Investment, interest rate, paid in kind [1],[2],[15],[41] 8.50%     8.50%                    
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 4,274,000 [1],[2],[3],[15] 4,269,000 [7],[10],[14],[16]   $ 4,274,000 [1],[2],[3],[15]   4,269,000 [7],[10],[14],[16]                
Cost 4,264,000 [1],[2],[3],[15] 4,261,000 [7],[10],[14],[16]   4,264,000 [1],[2],[3],[15]   4,261,000 [7],[10],[14],[16]                
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 655,000 [2],[12],[15] 627,000 [10],[13],[16]   655,000 [2],[12],[15]   627,000 [10],[13],[16]                
Cost 682,000 [2],[12],[15] 682,000 [10],[13],[16]   682,000 [2],[12],[15]   682,000 [10],[13],[16]                
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value [12] 1,838,000 1,339,000   1,838,000   1,339,000                
Cost [12] 4,194,000 4,194,000   4,194,000   4,194,000                
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, First Lien Senior Secured Note                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,719,000 5,113,000   4,719,000   5,113,000                
Cost 5,738,000 5,720,000   5,738,000   5,720,000                
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, Series A Convertible Preferred                            
Summary of Investment Holdings [Line Items]                            
Fair value [12] 914,000     914,000                    
Cost [12] $ 955,000     $ 955,000                    
Investment, interest rate, paid in kind [12] 15.00%     15.00%                    
Investment, Identifier [Axis]: Catawba River Limited, Structured Junior Note                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 12,999,000 12,635,000   $ 12,999,000   12,635,000                
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Diversified Financial Services, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,717,000 [1],[2],[15],[17] 820,000   1,717,000 [1],[2],[15],[17]   820,000                
Cost 1,649,000 [1],[2],[15],[17] 768,000   1,649,000 [1],[2],[15],[17]   768,000                
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Diversified Financial Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 430,000 [1],[2],[15],[17] 1,158,000   430,000 [1],[2],[15],[17]   1,158,000                
Cost 400,000 [1],[2],[15],[17] 1,151,000   400,000 [1],[2],[15],[17]   1,151,000                
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Incremental CAF Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 921,000 1,028,000   921,000   1,028,000                
Investment, Identifier [Axis]: Ceres Pharma NV, Pharma-ceuticals, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,274,000 [1],[2],[15],[28] 3,139,000 [7],[10],[16],[29]   3,274,000 [1],[2],[15],[28]   3,139,000 [7],[10],[16],[29]                
Cost 3,268,000 [1],[2],[15],[28] 3,264,000 [7],[10],[16],[29]   3,268,000 [1],[2],[15],[28]   3,264,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Charming Charlie LLC, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       0        
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       0        
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       0        
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 3                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       0        
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 4                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       0        
Investment, Identifier [Axis]: Cineworld Group PLC, Leisure Products, Warrants                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [12],[15] 0 [10],[13],[16]   0 [12],[15]   0 [10],[13],[16]                
Cost 102,000 [12],[15] 102,000 [10],[13],[16]   102,000 [12],[15]   102,000 [10],[13],[16]                
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,203,000 [1],[2],[3] 6,189,000 [7],[10],[25]   6,203,000 [1],[2],[3]   6,189,000 [7],[10],[25]                
Cost 6,188,000 [1],[2],[3] 6,182,000 [7],[10],[25]   6,188,000 [1],[2],[3]   6,182,000 [7],[10],[25]                
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 523,000     523,000                    
Cost [1],[2],[3] 521,000     521,000                    
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers,First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[25]   523,000       523,000                
Cost [7],[10],[25]   522,000       522,000                
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 78,000 78,000   78,000   78,000                
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,718,000 [2],[12] 10,729,000 [10],[13]   10,718,000 [2],[12]   10,729,000 [10],[13]                
Cost 9,093,000 [2],[12] 9,093,000 [10],[13]   9,093,000 [2],[12]   9,093,000 [10],[13]                
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, Subordinated Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,194,000 [2] 6,036,000 [10]   6,194,000 [2]   6,036,000 [10]                
Cost $ 6,217,000 [2] $ 6,054,000 [10]   $ 6,217,000 [2]   $ 6,054,000 [10]                
Investment, interest rate, paid in kind 10.00% [2] 10.00% [10]   10.00% [2]   10.00% [10]                
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, Subordinated Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 15,558,000 [2] $ 15,528,000 [10]   $ 15,558,000 [2]   $ 15,528,000 [10]                
Cost 15,530,000 [2] 15,509,000 [10]   15,530,000 [2]   15,509,000 [10]                
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, Diversified Manufacturing                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,285,000 [1],[2],[6],[15] 1,270,000 [7],[10],[11],[16]   1,285,000 [1],[2],[6],[15]   1,270,000 [7],[10],[11],[16]                
Cost 1,278,000 [1],[2],[6],[15] 1,276,000 [7],[10],[11],[16]   1,278,000 [1],[2],[6],[15]   1,276,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, Class B Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 208,000 [2],[12] 196,000 [10],[13]   208,000 [2],[12]   196,000 [10],[13]                
Cost 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 13,346,000 [1],[2],[21] 13,302,000 [7],[10],[22]   13,346,000 [1],[2],[21]   13,302,000 [7],[10],[22]                
Cost 13,295,000 [1],[2],[21] 13,316,000 [7],[10],[22]   13,295,000 [1],[2],[21]   13,316,000 [7],[10],[22]                
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 164,000 [2],[12] 159,000 [10],[13]   164,000 [2],[12]   159,000 [10],[13]                
Cost 125,000 [2],[12] 125,000 [10],[13]   125,000 [2],[12]   125,000 [10],[13]                
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, Senior Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 371,000 [2] 369,000 [10]   371,000 [2]   369,000 [10]                
Cost $ 373,000 [2] $ 371,000 [10]   $ 373,000 [2]   $ 371,000 [10]                
Investment, interest rate, paid in kind 1.00% [2] 1.00% [10]   1.00% [2]   1.00% [10]                
Investment, Identifier [Axis]: Comply365, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 1,101,000 $ 935,000   $ 1,101,000   $ 935,000                
Investment, Identifier [Axis]: Comply365, LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 13,434,000 [1],[2],[23] 13,446,000 [7],[10],[24]   13,434,000 [1],[2],[23]   13,446,000 [7],[10],[24]                
Cost 13,383,000 [1],[2],[23] 13,407,000 [7],[10],[24]   13,383,000 [1],[2],[23]   13,407,000 [7],[10],[24]                
Investment, Identifier [Axis]: Comply365, LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (15,000) [1],[2],[23] 148,000 [7],[10],[24]   (15,000) [1],[2],[23]   148,000 [7],[10],[24]                
Cost (19,000) [1],[2],[23] 146,000 [7],[10],[24]   (19,000) [1],[2],[23]   146,000 [7],[10],[24]                
Investment, Identifier [Axis]: Contabo Finco S.À R.L, Internet Software & Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,951,000 [1],[2],[15],[17] 4,845,000 [7],[10],[16],[18]   4,951,000 [1],[2],[15],[17]   4,845,000 [7],[10],[16],[18]                
Cost 4,527,000 [1],[2],[15],[17] 4,524,000 [7],[10],[16],[18]   4,527,000 [1],[2],[15],[17]   4,524,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 28,000 [12] 7,000 [13]   28,000 [12]   7,000 [13]                
Cost 296,000 [12] 296,000 [13]   296,000 [12]   296,000 [13]                
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 15,031,000 [2],[5] 11,118,000 [10]   15,031,000 [2],[5]   11,118,000 [10]                
Cost 29,619,000 [2],[5] 29,619,000 [10]   29,619,000 [2],[5]   29,619,000 [10]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 427,000 419,000   427,000   419,000                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class A Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 202,000 [2],[12],[15] 196,000 [10],[13],[16]   202,000 [2],[12],[15]   196,000 [10],[13],[16]                
Cost 205,000 [2],[12],[15] 205,000 [10],[13],[16]   205,000 [2],[12],[15]   205,000 [10],[13],[16]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class B Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 514,000 [2],[12],[15] 497,000 [10],[13],[16]   514,000 [2],[12],[15]   497,000 [10],[13],[16]                
Cost 446,000 [2],[12],[15] 446,000 [10],[13],[16]   446,000 [2],[12],[15]   446,000 [10],[13],[16]                
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,457,000 [1],[2],[15],[28] 4,233,000 [7],[10],[16],[29]   4,457,000 [1],[2],[15],[28]   4,233,000 [7],[10],[16],[29]                
Cost $ 4,714,000 [1],[2],[15],[28] $ 4,638,000 [7],[10],[16],[29]   $ 4,714,000 [1],[2],[15],[28]   $ 4,638,000 [7],[10],[16],[29]                
Investment, interest rate, paid in kind 3.50% [1],[2],[15],[28] 3.50% [7],[10],[16],[29]   3.50% [1],[2],[15],[28]   3.50% [7],[10],[16],[29]                
Investment, Identifier [Axis]: Custom Alloy Corporation, Manufacturer of Pipe Fittings & Forgings, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 80,000 [2],[5],[43] $ 189,000 [9],[10],[44]   $ 80,000 [2],[5],[43]   $ 189,000 [9],[10],[44]                
Cost $ 4,222,000 [2],[5],[43] $ 4,222,000 [9],[10],[44]   $ 4,222,000 [2],[5],[43]   $ 4,222,000 [9],[10],[44]                
Investment, interest rate, paid in kind 15.00% [2],[5],[43] 15.00% [9],[10],[44]   15.00% [2],[5],[43]   15.00% [9],[10],[44]                
Investment, Identifier [Axis]: Custom Alloy Corporation, Manufacturer of Pipe Fittings & Forgings, Second Lien Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 844,000 [2],[5],[43] $ 1,997,000 [9],[10],[44]   $ 844,000 [2],[5],[43]   $ 1,997,000 [9],[10],[44]                
Cost $ 42,162,000 [2],[5],[43] $ 42,162,000 [9],[10],[44]   $ 42,162,000 [2],[5],[43]   $ 42,162,000 [9],[10],[44]                
Investment, interest rate, paid in kind 15.00% [2],[5],[43] 15.00% [9],[10],[44]   15.00% [2],[5],[43]   15.00% [9],[10],[44]                
Investment, Identifier [Axis]: DISA Holdings Corp., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 1,368,000 $ 1,368,000   $ 1,368,000   $ 1,368,000                
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,507,000 [1],[2],[6] 5,491,000 [7],[10],[22]   5,507,000 [1],[2],[6]   5,491,000 [7],[10],[22]                
Cost 5,491,000 [1],[2],[6] 5,496,000 [7],[10],[22]   5,491,000 [1],[2],[6]   5,496,000 [7],[10],[22]                
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (11,000) [1],[2],[21] 0 [7],[10],[22]   (11,000) [1],[2],[21]   0 [7],[10],[22]                
Cost (12,000) [1],[2],[21] 0 [7],[10],[22]   (12,000) [1],[2],[21]   0 [7],[10],[22]                
Investment, Identifier [Axis]: DISA Holdings Corp., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 429,000 416,000   429,000   416,000                
Investment, Identifier [Axis]: DataOnline Corp., High Tech Industries, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 14,222,000 [1],[2],[4],[6] 14,259,000 [7],[8],[10],[11]   14,222,000 [1],[2],[4],[6]   14,259,000 [7],[8],[10],[11]                
Cost 14,513,000 [1],[2],[4],[6] 14,550,000 [7],[8],[10],[11]   14,513,000 [1],[2],[4],[6]   14,550,000 [7],[8],[10],[11]                
Investment, Identifier [Axis]: DataOnline Corp., High Tech Industries, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,100,000 [1],[2],[4],[6] 2,100,000 [7],[8],[10],[11]   2,100,000 [1],[2],[4],[6]   2,100,000 [7],[8],[10],[11]                
Cost 2,143,000 [1],[2],[4],[6] 2,143,000 [7],[8],[10],[11]   2,143,000 [1],[2],[4],[6]   2,143,000 [7],[8],[10],[11]                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 481,000 481,000   481,000   481,000                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,876,000 [1],[2],[3] 1,875,000 [7],[10],[14]   1,876,000 [1],[2],[3]   1,875,000 [7],[10],[14]                
Cost 1,873,000 [1],[2],[3] 1,876,000 [7],[10],[14]   1,873,000 [1],[2],[3]   1,876,000 [7],[10],[14]                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 100,000 [2],[12] 96,000 [10]   100,000 [2],[12]   96,000 [10]                
Cost 96,000 [2],[12] 96,000 [10]   96,000 [2],[12]   96,000 [10]                
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (9,000) [1],[2],[3] (11,000) [7],[10],[14]   (9,000) [1],[2],[3]   (11,000) [7],[10],[14]                
Cost (10,000) [1],[2],[3] (10,000) [7],[10],[14]   (10,000) [1],[2],[3]   (10,000) [7],[10],[14]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 51,000 [2],[12] 48,000 [10],[13]   51,000 [2],[12]   48,000 [10],[13]                
Cost 55,000 [2],[12] 55,000 [10],[13]   55,000 [2],[12]   55,000 [10],[13]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 674,000 [1],[2],[26] 690,000 [7],[10],[25]   674,000 [1],[2],[26]   690,000 [7],[10],[25]                
Cost 671,000 [1],[2],[26] 688,000 [7],[10],[25]   671,000 [1],[2],[26]   688,000 [7],[10],[25]                
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (3,000) [1],[2],[26] (3,000) [7],[10],[25]   (3,000) [1],[2],[26]   (3,000) [7],[10],[25]                
Cost (3,000) [1],[2],[26] (3,000) [7],[10],[25]   (3,000) [1],[2],[26]   (3,000) [7],[10],[25]                
Investment, Identifier [Axis]: DecksDirect, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 218,000 218,000   218,000   218,000                
Investment, Identifier [Axis]: Distinct Holdings, Inc., Systems Software, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,609,000 [1],[2],[3] 6,096,000   6,609,000 [1],[2],[3]   6,096,000                
Cost 6,891,000 [1],[2],[3] 6,860,000   6,891,000 [1],[2],[3]   6,860,000                
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,565,000 [1],[2],[15],[28] 2,515,000 [7],[10],[16],[18]   2,565,000 [1],[2],[15],[28]   2,515,000 [7],[10],[16],[18]                
Cost 2,830,000 [1],[2],[15],[28] 2,828,000 [7],[10],[16],[18]   2,830,000 [1],[2],[15],[28]   2,828,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,176,000 [1],[2],[15],[28] 1,153,000 [7],[10],[16],[29]   1,176,000 [1],[2],[15],[28]   1,153,000 [7],[10],[16],[29]                
Cost 1,171,000 [1],[2],[15],[28] 1,170,000 [7],[10],[16],[29]   1,171,000 [1],[2],[15],[28]   1,170,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: DreamStart Bidco SAS (d/b/a SmartTrade), Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 579,000   0   579,000                
Investment, Identifier [Axis]: DreamStart Bidco SAS (d/b/a SmartTrade), Diversified Financial Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,310,000 [1],[2],[15],[17] 2,247,000 [7],[10],[16],[18]   2,310,000 [1],[2],[15],[17]   2,247,000 [7],[10],[16],[18]                
Cost 2,317,000 [1],[2],[15],[17] 2,305,000 [7],[10],[16],[18]   2,317,000 [1],[2],[15],[17]   2,305,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Dryden 43 Senior Loan Fund, Series 2016-43A, Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,859,000 [4],[15] 2,084,000 [8],[16]   1,859,000 [4],[15]   2,084,000 [8],[16]                
Cost 2,305,000 [4],[15] 2,329,000 [8],[16]   2,305,000 [4],[15]   2,329,000 [8],[16]                
Investment, Identifier [Axis]: Dryden 49 Senior Loan Fund, Series 2017-49A, Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,789,000 [4],[15] 4,267,000 [8],[16]   3,789,000 [4],[15]   4,267,000 [8],[16]                
Cost 6,541,000 [4],[15] 6,790,000 [8],[16]   6,541,000 [4],[15]   6,790,000 [8],[16]                
Investment, Identifier [Axis]: Dune Group, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 635,000 624,000   635,000   624,000                
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 100,000 [1],[2],[15],[17] 111,000 [7],[10],[16],[18]   100,000 [1],[2],[15],[17]   111,000 [7],[10],[16],[18]                
Cost 110,000 [1],[2],[15],[17] 109,000 [7],[10],[16],[18]   110,000 [1],[2],[15],[17]   109,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,190,000 [1],[2],[6],[15] 1,209,000 [7],[10],[11],[16]   1,190,000 [1],[2],[6],[15]   1,209,000 [7],[10],[11],[16]                
Cost 1,213,000 [1],[2],[6],[15] 1,212,000 [7],[10],[11],[16]   1,213,000 [1],[2],[6],[15]   1,212,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: Dunlipharder B.V., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 989,000 [1],[2],[3],[15] 988,000 [7],[10],[14],[16]   989,000 [1],[2],[3],[15]   988,000 [7],[10],[14],[16]                
Cost 987,000 [1],[2],[3],[15] 986,000 [7],[10],[14],[16]   987,000 [1],[2],[3],[15]   986,000 [7],[10],[14],[16]                
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 5,165,000 5,164,000   5,165,000   5,164,000                
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 25,274,000 [1],[2],[6] 25,287,000 [7],[10],[11]   25,274,000 [1],[2],[6]   25,287,000 [7],[10],[11]                
Cost 25,222,000 [1],[2],[6] 25,257,000 [7],[10],[11]   25,222,000 [1],[2],[6]   25,257,000 [7],[10],[11]                
Investment, Identifier [Axis]: EFC International, Automotive, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value [2],[12] 231,000     231,000                    
Cost [2],[12] 231,000     231,000                    
Investment, Identifier [Axis]: EFC International, Automotive, Senior Unsecured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [2] 746,000     746,000                    
Cost [2] $ 746,000     $ 746,000                    
Investment, interest rate, paid in kind [2] 2.50%     2.50%                    
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,955,000 [1],[2],[6] 12,008,000 [7],[10],[11]   11,955,000 [1],[2],[6]   12,008,000 [7],[10],[11]                
Cost 12,256,000 [1],[2],[6] 12,272,000 [7],[10],[11]   12,256,000 [1],[2],[6]   12,272,000 [7],[10],[11]                
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,786,000 [1],[2],[6] 1,409,000 [7],[10],[11]   1,786,000 [1],[2],[6]   1,409,000 [7],[10],[11]                
Cost 1,828,000 [1],[2],[6] 1,446,000 [7],[10],[11]   1,828,000 [1],[2],[6]   1,446,000 [7],[10],[11]                
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,092,000 1,471,000   1,092,000   1,471,000                
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 257,000 257,000   257,000   257,000                
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Electrical Components & Equipment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,019,000 [1],[2],[6] 6,024,000 [7],[10],[11]   6,019,000 [1],[2],[6]   6,024,000 [7],[10],[11]                
Cost 5,966,000 [1],[2],[6] 5,978,000 [7],[10],[11]   5,966,000 [1],[2],[6]   5,978,000 [7],[10],[11]                
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Partnership Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 649,000 [2],[12] 933,000 [10],[13]   649,000 [2],[12]   933,000 [10],[13]                
Cost 531,000 [2],[12] 531,000 [10],[13]   531,000 [2],[12]   531,000 [10],[13]                
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,289,000 [1],[2],[26] 9,100,000 [7],[10],[11]   9,289,000 [1],[2],[26]   9,100,000 [7],[10],[11]                
Cost 9,324,000 [1],[2],[26] 9,320,000 [7],[10],[11]   9,324,000 [1],[2],[26]   9,320,000 [7],[10],[11]                
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value                     $ 4,500,000      
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Revolver, Funded                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,400,000 5,300,000   4,400,000   5,300,000                
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Revolver, Unfunded                            
Summary of Investment Holdings [Line Items]                            
Fair value               $ 22,700,000     13,600,000      
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Second Lien Senior Secured Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value                     $ 89,800,000      
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 143,116,000 [2] 135,066,000 [10]   143,116,000 [2]   135,066,000 [10]                
Cost 93,230,000 [2] 93,230,000 [10]   93,230,000 [2]   93,230,000 [10]                
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,364,000 [2],[26] 5,273,000 [10],[25]   4,364,000 [2],[26]   5,273,000 [10],[25]                
Cost 4,260,000 [2],[26] 5,165,000 [10],[25]   4,260,000 [2],[26]   5,165,000 [10],[25]                
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,545,000 [2] 4,545,000 [10]   4,545,000 [2]   4,545,000 [10]                
Cost 4,509,000 [2] 4,508,000 [10]   4,509,000 [2]   4,508,000 [10]                
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, LLC units                            
Summary of Investment Holdings [Line Items]                            
Fair value 143,116,000 135,066,000   143,116,000   135,066,000       92,668,000        
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 18,364,000 17,455,000   18,364,000   17,455,000                
Fair value 4,364,000 5,273,000   4,364,000   5,273,000       1,818,000        
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,877,000 [1],[2],[6] 4,893,000 [7],[10],[11]   4,877,000 [1],[2],[6]   4,893,000 [7],[10],[11]                
Cost 4,848,000 [1],[2],[6] 4,868,000 [7],[10],[11]   4,848,000 [1],[2],[6]   4,868,000 [7],[10],[11]                
Investment, Identifier [Axis]: Entact Environmental Services, Inc., Environmental Industries, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,498,000 [1],[2],[6] 5,529,000 [7],[10],[11]   5,498,000 [1],[2],[6]   5,529,000 [7],[10],[11]                
Cost 5,478,000 [1],[2],[6] 5,511,000 [7],[10],[11]   5,478,000 [1],[2],[6]   5,511,000 [7],[10],[11]                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Delayed Draw Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,686,000 2,639,000   2,686,000   2,639,000                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Delayed Draw Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 537,000 528,000   537,000   528,000                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,390,000 [1],[2],[15],[17] 1,352,000 [7],[10],[16],[18]   1,390,000 [1],[2],[15],[17]   1,352,000 [7],[10],[16],[18]                
Cost 1,348,000 [1],[2],[15],[17] 1,338,000 [7],[10],[16],[18]   1,348,000 [1],[2],[15],[17]   1,338,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 748,000 [1],[2],[3],[15] 745,000 [7],[10],[14],[16]   748,000 [1],[2],[3],[15]   745,000 [7],[10],[14],[16]                
Cost 746,000 [1],[2],[3],[15] 745,000 [7],[10],[14],[16]   746,000 [1],[2],[3],[15]   745,000 [7],[10],[14],[16]                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 3                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,176,000 [1],[2],[15],[30] 2,111,000 [7],[10],[16],[31]   2,176,000 [1],[2],[15],[30]   2,111,000 [7],[10],[16],[31]                
Cost 2,159,000 [1],[2],[15],[30] 2,158,000 [7],[10],[16],[31]   2,159,000 [1],[2],[15],[30]   2,158,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 4                            
Summary of Investment Holdings [Line Items]                            
Fair value 542,000 [2],[15] 513,000 [7],[10],[16]   542,000 [2],[15]   513,000 [7],[10],[16]                
Cost $ 525,000 [2],[15] $ 507,000 [7],[10],[16]   $ 525,000 [2],[15]   $ 507,000 [7],[10],[16]                
Investment, interest rate, paid in kind 11.50% [2],[15] 11.50% [7],[10],[16]   11.50% [2],[15]   11.50% [7],[10],[16]                
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 640,000 $ 640,000   $ 640,000   $ 640,000                
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,523,000 [1],[2],[15],[35] 1,573,000 [7],[10],[16],[45]   1,523,000 [1],[2],[15],[35]   1,573,000 [7],[10],[16],[45]                
Cost 1,856,000 [1],[2],[15],[35] 1,853,000 [7],[10],[16],[45]   1,856,000 [1],[2],[15],[35]   1,853,000 [7],[10],[16],[45]                
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,813,000 [1],[2],[21] 7,106,000 [7],[10],[22]   6,813,000 [1],[2],[21]   7,106,000 [7],[10],[22]                
Cost 7,079,000 [1],[2],[21] 7,092,000 [7],[10],[22]   7,079,000 [1],[2],[21]   7,092,000 [7],[10],[22]                
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 127,000 [1],[2],[21] 137,000 [7],[10],[22]   127,000 [1],[2],[21]   137,000 [7],[10],[22]                
Cost 136,000 [1],[2],[21] 136,000 [7],[10],[22]   136,000 [1],[2],[21]   136,000 [7],[10],[22]                
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 115,000 115,000   115,000   115,000                
Investment, Identifier [Axis]: F24 (Stairway BidCo GmbH), Acquisition Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 230,000 246,000   230,000   246,000                
Investment, Identifier [Axis]: F24 (Stairway BidCo Gmbh), Software Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,657,000 [1],[2],[15],[17] 1,644,000 [7],[10],[16],[18]   1,657,000 [1],[2],[15],[17]   1,644,000 [7],[10],[16],[18]                
Cost 1,814,000 [1],[2],[15],[17] 1,792,000 [7],[10],[16],[18]   1,814,000 [1],[2],[15],[17]   1,792,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,761,000 [1],[2],[26] 6,767,000 [7],[10],[25]   6,761,000 [1],[2],[26]   6,767,000 [7],[10],[25]                
Cost 6,716,000 [1],[2],[26] 6,728,000 [7],[10],[25]   6,716,000 [1],[2],[26]   6,728,000 [7],[10],[25]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 18,000 [2],[12] 17,000 [10],[13]   18,000 [2],[12]   17,000 [10],[13]                
Cost 12,000 [2],[12] 12,000 [10],[13]   12,000 [2],[12]   12,000 [10],[13]                
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 77,000 [2],[12] 75,000 [10],[13]   77,000 [2],[12]   75,000 [10],[13]                
Cost 51,000 [2],[12] 51,000 [10],[13]   51,000 [2],[12]   51,000 [10],[13]                
Investment, Identifier [Axis]: Faraday, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 974,000 0   974,000   0                
Investment, Identifier [Axis]: Faraday, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[15],[17] 1,583,000     1,583,000                    
Cost [1],[2],[15],[17] 1,585,000     1,585,000                    
Investment, Identifier [Axis]: Ferrellgas L.P., Oil & Gas Equipment & Services, Opco Preferred Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,597,000 [2] 2,742,000 [10]   2,597,000 [2]   2,742,000 [10]                
Cost 2,799,000 [2] 2,799,000 [10]   2,799,000 [2]   2,799,000 [10]                
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings Inc., Business Equipment & Services, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,686,000 [2] 6,084,000 [10]   6,686,000 [2]   6,084,000 [10]                
Cost $ 7,892,000 [2] $ 7,892,000 [10]   $ 7,892,000 [2]   $ 7,892,000 [10]                
Investment, interest rate, paid in kind 11.00% [2] 11.00% [10]   11.00% [2]   11.00% [10]                
Investment, Identifier [Axis]: Fineline Technologies, Inc., Consumer Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 1,267,000 [1],[2],[6] $ 1,270,000 [7],[10],[11]   $ 1,267,000 [1],[2],[6]   $ 1,270,000 [7],[10],[11]                
Cost 1,271,000 [1],[2],[6] 1,274,000 [7],[10],[11]   1,271,000 [1],[2],[6]   1,274,000 [7],[10],[11]                
Investment, Identifier [Axis]: Fineline Technologies, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 180,000   0   180,000                
Investment, Identifier [Axis]: Finexvet, Consumer Cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,383,000 [1],[2],[15],[28] 2,329,000 [7],[10],[16],[29]   2,383,000 [1],[2],[15],[28]   2,329,000 [7],[10],[16],[29]                
Cost 2,381,000 [1],[2],[15],[28] 2,379,000 [7],[10],[16],[29]   2,381,000 [1],[2],[15],[28]   2,379,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: FitzMark Buyer, LLC, Cargo & Transportation, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,154,000 [1],[2],[6] 4,165,000 [7],[10],[11]   4,154,000 [1],[2],[6]   4,165,000 [7],[10],[11]                
Cost 4,149,000 [1],[2],[6] 4,164,000 [7],[10],[11]   4,149,000 [1],[2],[6]   4,164,000 [7],[10],[11]                
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 962,000 [2],[12] 962,000 [10],[13]   962,000 [2],[12]   962,000 [10],[13]                
Cost 967,000 [2],[12] 967,000 [10],[13]   967,000 [2],[12]   967,000 [10],[13]                
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 13,501,000 [1],[2],[3] 13,295,000 [7],[10],[14]   13,501,000 [1],[2],[3]   13,295,000 [7],[10],[14]                
Cost 13,441,000 [1],[2],[3] 13,434,000 [7],[10],[14]   13,441,000 [1],[2],[3]   13,434,000 [7],[10],[14]                
Investment, Identifier [Axis]: Flexential Issuer, LLC, Information Technology, Structured Secured Note - Class C                            
Summary of Investment Holdings [Line Items]                            
Fair value 13,380,000 13,827,000   13,380,000   13,827,000                
Cost 14,845,000 14,839,000   14,845,000   14,839,000                
Investment, Identifier [Axis]: Flywheel Re Segregated Portfolio 2022-4, Investment Funds, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,941,000 [2],[12],[15] 1,932,000 [10],[13],[16]   1,941,000 [2],[12],[15]   1,932,000 [10],[13],[16]                
Cost 1,922,000 [2],[12],[15] 1,922,000 [10],[13],[16]   1,922,000 [2],[12],[15]   1,922,000 [10],[13],[16]                
Investment, Identifier [Axis]: Footco 40 Limited, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 556,000 766,000   556,000   766,000                
Investment, Identifier [Axis]: Footco 40 Limited, Media & Entertainment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,694,000 [1],[2],[15],[30] 1,437,000 [7],[10],[16],[31]   1,694,000 [1],[2],[15],[30]   1,437,000 [7],[10],[16],[31]                
Cost 1,792,000 [1],[2],[15],[30] 1,561,000 [7],[10],[16],[31]   1,792,000 [1],[2],[15],[30]   1,561,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 925,000 925,000   925,000   925,000                
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Other Financial, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,517,000 [1],[2],[21] 1,513,000 [7],[10],[22]   1,517,000 [1],[2],[21]   1,513,000 [7],[10],[22]                
Cost 1,518,000 [1],[2],[21] 1,516,000 [7],[10],[22]   1,518,000 [1],[2],[21]   1,516,000 [7],[10],[22]                
Investment, Identifier [Axis]: FragilePak LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,354,000 2,354,000   2,354,000   2,354,000                
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,626,000 [1],[2],[6] 4,638,000 [7],[10],[11]   4,626,000 [1],[2],[6]   4,638,000 [7],[10],[11]                
Cost 4,487,000 [1],[2],[6] 4,491,000 [7],[10],[11]   4,487,000 [1],[2],[6]   4,491,000 [7],[10],[11]                
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,179,000 [2],[12] 1,179,000 [10],[13]   1,179,000 [2],[12]   1,179,000 [10],[13]                
Cost 938,000 [2],[12] 938,000 [10],[13]   938,000 [2],[12]   938,000 [10],[13]                
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 117,000 [12] 158,000 [13]   117,000 [12]   158,000 [13]                
Cost 370,000 [12] 320,000 [13]   370,000 [12]   320,000 [13]                
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,828,000 [1],[2],[6] 4,871,000 [7],[10],[11]   4,828,000 [1],[2],[6]   4,871,000 [7],[10],[11]                
Cost 4,053,000 [1],[2],[6] 4,089,000 [7],[10],[11]   4,053,000 [1],[2],[6]   4,089,000 [7],[10],[11]                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 16,257,000 [1],[2],[3] 16,271,000 [7],[10],[14]   16,257,000 [1],[2],[3]   16,271,000 [7],[10],[14]                
Cost 16,251,000 [1],[2],[3] 16,276,000 [7],[10],[14]   16,251,000 [1],[2],[3]   16,276,000 [7],[10],[14]                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 686,000 687,000 [10],[13]   686,000   687,000 [10],[13]                
Cost 687,000 687,000 [10],[13]   687,000   687,000 [10],[13]                
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (73,000) [1],[2],[3] (77,000) [7],[10],[14]   (73,000) [1],[2],[3]   (77,000) [7],[10],[14]                
Cost (73,000) [1],[2],[3] (76,000) [7],[10],[14]   (73,000) [1],[2],[3]   (76,000) [7],[10],[14]                
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,581,000 2,581,000   2,581,000   2,581,000                
Investment, Identifier [Axis]: GPZN II GmbH, CAF Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 560,000   0   560,000                
Investment, Identifier [Axis]: GPZN II GmbH, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 426,000 [1],[2],[15],[32] 375,000 [7],[10],[16],[46]   426,000 [1],[2],[15],[32]   375,000 [7],[10],[16],[46]                
Cost $ 445,000 [1],[2],[15],[32] 429,000 [7],[10],[16],[46]   $ 445,000 [1],[2],[15],[32]   429,000 [7],[10],[16],[46]                
Investment, interest rate, paid in kind [1],[2],[15],[32] 1.00%     1.00%                    
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Second Lien Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [10],[44]   10,442,000       10,442,000                
Cost [10],[44]   $ 10,587,000       $ 10,587,000                
Investment, interest rate, paid in kind [10],[44]   1.00%       1.00%                
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Series A Preferred Units                            
Summary of Investment Holdings [Line Items]                            
Fair value [10],[13],[44]   $ 2,252,000       $ 2,252,000                
Cost [10],[13],[44]   2,166,000       2,166,000                
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Series C Preferred Units                            
Summary of Investment Holdings [Line Items]                            
Fair value   2,158,000       2,158,000                
Cost   1,081,000       1,081,000                
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 2,414,000 [1],[2],[15],[47] 2,438,000 [7],[10],[16],[45]   $ 2,414,000 [1],[2],[15],[47]   2,438,000 [7],[10],[16],[45]                
Cost 2,505,000 [1],[2],[15],[47] 2,502,000 [7],[10],[16],[45]   2,505,000 [1],[2],[15],[47]   2,502,000 [7],[10],[16],[45]                
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,208,000 [1],[2],[15],[48] 4,242,000 [7],[10],[16],[49]   4,208,000 [1],[2],[15],[48]   4,242,000 [7],[10],[16],[49]                
Cost 4,208,000 [1],[2],[15],[48] 4,202,000 [7],[10],[16],[49]   4,208,000 [1],[2],[15],[48]   4,202,000 [7],[10],[16],[49]                
Investment, Identifier [Axis]: Global Academic Group Limited, Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 446,000 451,000   446,000   451,000                
Investment, Identifier [Axis]: Greenhill II BV, Capex Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 260,000 255,000   260,000   255,000                
Investment, Identifier [Axis]: Greenhill II BV, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 731,000 [1],[2],[15],[17] 716,000 [7],[10],[16],[18]   731,000 [1],[2],[15],[17]   716,000 [7],[10],[16],[18]                
Cost 672,000 [1],[2],[15],[17] 672,000 [7],[10],[16],[18]   672,000 [1],[2],[15],[17]   672,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Groupe Product Life, Consumer Non-cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 613,000 [1],[2],[15],[17] 598,000 [7],[10],[16],[18]   613,000 [1],[2],[15],[17]   598,000 [7],[10],[16],[18]                
Cost 554,000 [1],[2],[15],[17] 553,000 [7],[10],[16],[18]   554,000 [1],[2],[15],[17]   553,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Groupe Product Life, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 449,000 441,000   449,000   441,000                
Investment, Identifier [Axis]: Gulf Finance, LLC, Oil & Gas Exploration & Production, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 795,000 [1],[21] 772,000 [7],[25]   795,000 [1],[21]   772,000 [7],[25]                
Cost 790,000 [1],[21] 797,000 [7],[25]   790,000 [1],[21]   797,000 [7],[25]                
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 220,000 223,000   220,000   223,000                
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd., Consumer Non-Cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,119,000 [1],[2],[15],[35] 2,136,000 [7],[10],[16],[36]   2,119,000 [1],[2],[15],[35]   2,136,000 [7],[10],[16],[36]                
Cost 2,018,000 [1],[2],[15],[35] 2,016,000 [7],[10],[16],[36]   2,018,000 [1],[2],[15],[35]   2,016,000 [7],[10],[16],[36]                
Investment, Identifier [Axis]: HEKA Invest, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 565,000 555,000   565,000   555,000                
Investment, Identifier [Axis]: HEKA Invest, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,957,000 [1],[2],[15],[17] 4,846,000 [7],[10],[16],[18]   4,957,000 [1],[2],[15],[17]   4,846,000 [7],[10],[16],[18]                
Cost 4,465,000 [1],[2],[15],[17] 4,461,000 [7],[10],[16],[18]   4,465,000 [1],[2],[15],[17]   4,461,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: HTI Technology & Industries, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,045,000 2,045,000   2,045,000   2,045,000                
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (41,000) [1],[2],[23] (18,000) [7],[10],[14]   (41,000) [1],[2],[23]   (18,000) [7],[10],[14]                
Cost (16,000) [1],[2],[23] (18,000) [7],[10],[14]   (16,000) [1],[2],[23]   (18,000) [7],[10],[14]                
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Second Lien Note                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,107,000 [1],[2],[23] 11,363,000 [7],[10],[14]   11,107,000 [1],[2],[23]   11,363,000 [7],[10],[14]                
Cost 11,353,000 [1],[2],[23] 11,361,000 [7],[10],[14]   11,353,000 [1],[2],[23]   11,361,000 [7],[10],[14]                
Investment, Identifier [Axis]: HTI Technology & Industries, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,263,000 [1],[2],[6] 4,928,000 [7],[10],[11]   5,263,000 [1],[2],[6]   4,928,000 [7],[10],[11]                
Cost 5,279,000 [1],[2],[6] 4,946,000 [7],[10],[11]   5,279,000 [1],[2],[6]   4,946,000 [7],[10],[11]                
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,800,000 [1],[2],[26] 5,834,000 [7],[10],[25]   5,800,000 [1],[2],[26]   5,834,000 [7],[10],[25]                
Cost 5,797,000 [1],[2],[26] 5,832,000 [7],[10],[25]   5,797,000 [1],[2],[26]   5,832,000 [7],[10],[25]                
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 556,000 913,000   556,000   913,000                
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 309,000 313,000   309,000   313,000                
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 593,000 [1],[2],[15],[47] 598,000 [7],[10],[16],[45]   593,000 [1],[2],[15],[47]   598,000 [7],[10],[16],[45]                
Cost 570,000 [1],[2],[15],[47] 569,000 [7],[10],[16],[45]   570,000 [1],[2],[15],[47]   569,000 [7],[10],[16],[45]                
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 267,000 267,000   267,000   267,000                
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,170,000 [2] 1,151,000 [10]   1,170,000 [2]   1,151,000 [10]                
Cost $ 1,162,000 [2] $ 1,161,000 [10]   $ 1,162,000 [2]   $ 1,161,000 [10]                
Investment, interest rate, paid in kind 11.00% [2] 11.00% [10]   11.00% [2]   11.00% [10]                
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 9,825,000 [2] $ 9,183,000 [10]   $ 9,825,000 [2]   $ 9,183,000 [10]                
Cost $ 9,776,000 [2] $ 9,238,000 [10]   $ 9,776,000 [2]   $ 9,238,000 [10]                
Investment, interest rate, paid in kind 11.00% [2] 11.00% [10]   11.00% [2]   11.00% [10]                
Investment, Identifier [Axis]: Heartland, LLC, Business Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 13,740,000 [1],[2],[6] $ 13,795,000 [7],[10],[11]   $ 13,740,000 [1],[2],[6]   $ 13,795,000 [7],[10],[11]                
Cost 13,835,000 [1],[2],[6] 13,884,000 [7],[10],[11]   13,835,000 [1],[2],[6]   13,884,000 [7],[10],[11]                
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,288,000 [1],[2],[26] 7,276,000 [7],[10],[25]   7,288,000 [1],[2],[26]   7,276,000 [7],[10],[25]                
Cost 7,250,000 [1],[2],[26] 7,244,000 [7],[10],[25]   7,250,000 [1],[2],[26]   7,244,000 [7],[10],[25]                
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (29,000) [1],[2],[26] (33,000) [7],[10],[25]   (29,000) [1],[2],[26]   (33,000) [7],[10],[25]                
Cost (41,000) [1],[2],[26] (43,000) [7],[10],[25]   (41,000) [1],[2],[26]   (43,000) [7],[10],[25]                
Investment, Identifier [Axis]: Heilbron (f/k/a Sucsez (Bolt Bidco B.V.)), Insurance, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,235,000 [1],[2],[15],[17] 3,148,000 [7],[10],[16],[18]   3,235,000 [1],[2],[15],[17]   3,148,000 [7],[10],[16],[18]                
Cost 3,676,000 [1],[2],[15],[17] 3,676,000 [7],[10],[16],[18]   3,676,000 [1],[2],[15],[17]   3,676,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Holland Acquisition Corp., Energy: Oil & Gas, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [1],[2],[4],[5],[27] 0 [7],[8],[9],[10],[50]   0 [1],[2],[4],[5],[27]   0 [7],[8],[9],[10],[50]                
Cost 0 [1],[2],[4],[5],[27] 0 [7],[8],[9],[10],[50]   0 [1],[2],[4],[5],[27]   0 [7],[8],[9],[10],[50]                
Investment, Identifier [Axis]: Home Care Assistance, LLC, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,460,000 [1],[2],[21] 3,621,000 [7],[10],[22]   3,460,000 [1],[2],[21]   3,621,000 [7],[10],[22]                
Cost 3,720,000 [1],[2],[21] 3,736,000 [7],[10],[22]   3,720,000 [1],[2],[21]   3,736,000 [7],[10],[22]                
Investment, Identifier [Axis]: Honour Lane Logistics Holdings Limited, Transportation Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,834,000 [1],[2],[15],[23] 7,814,000 [7],[10],[16],[24]   7,834,000 [1],[2],[15],[23]   7,814,000 [7],[10],[16],[24]                
Cost 7,790,000 [1],[2],[15],[23] 7,781,000 [7],[10],[16],[24]   7,790,000 [1],[2],[15],[23]   7,781,000 [7],[10],[16],[24]                
Investment, Identifier [Axis]: Hygie 31 Holding, Pharma-ceuticals, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,699,000 [1],[2],[15],[51] 1,665,000 [7],[10],[16],[18]   1,699,000 [1],[2],[15],[51]   1,665,000 [7],[10],[16],[18]                
Cost 1,500,000 [1],[2],[15],[51] 1,498,000 [7],[10],[16],[18]   1,500,000 [1],[2],[15],[51]   1,498,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,551,000 4,496,000   4,551,000   4,496,000       0        
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,551,000 [2],[12] 4,496,000 [10],[13]   4,551,000 [2],[12]   4,496,000 [10],[13]                
Cost 5,219,000 [2],[12] 5,219,000 [10],[13]   5,219,000 [2],[12]   5,219,000 [10],[13]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,917,000 [1],[2],[3] 3,917,000 [7],[10],[14]   3,917,000 [1],[2],[3]   3,917,000 [7],[10],[14]                
Cost 3,689,000 [1],[2],[3] 3,670,000 [7],[10],[14]   3,689,000 [1],[2],[3]   3,670,000 [7],[10],[14]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,239,000 [1],[2],[3] 4,098,000 [7],[10],[14]   4,239,000 [1],[2],[3]   4,098,000 [7],[10],[14]                
Cost 4,239,000 [1],[2],[3] 4,098,000 [7],[10],[14]   4,239,000 [1],[2],[3]   4,098,000 [7],[10],[14]                
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,239,000 4,098,000   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                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,333,000 [1],[2],[26] 3,247,000 [7],[10],[25]   3,333,000 [1],[2],[26]   3,247,000 [7],[10],[25]                
Cost 3,381,000 [1],[2],[26] 3,388,000 [7],[10],[25]   3,381,000 [1],[2],[26]   3,388,000 [7],[10],[25]                
Investment, Identifier [Axis]: IM Analytics Holding, LLC (d/b/a NVT), Electronic Instruments & Components, Warrants                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Cost 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Investment, Identifier [Axis]: IM Square, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,649,000 [1],[2],[15],[17] 2,583,000 [7],[10],[16],[18]   2,649,000 [1],[2],[15],[17]   2,583,000 [7],[10],[16],[18]                
Cost 2,940,000 [1],[2],[15],[17] 2,938,000 [7],[10],[16],[18]   2,940,000 [1],[2],[15],[17]   2,938,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: INOS 19-090 GmbH, Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,422,000 2,380,000   2,422,000   2,380,000                
Investment, Identifier [Axis]: INOS 19-090 GmbH, Aerospace & Defense, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,036,000 [1],[2],[15],[17] 4,892,000 [7],[10],[16],[18]   5,036,000 [1],[2],[15],[17]   4,892,000 [7],[10],[16],[18]                
Cost 5,520,000 [1],[2],[15],[17] 5,515,000 [7],[10],[16],[18]   5,520,000 [1],[2],[15],[17]   5,515,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Delayed Draw Term Loan1                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 103,000   0   103,000                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Delayed Draw Term Loan2                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 4,249,000 0   4,249,000   0                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 857,000 118,000   857,000   118,000                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 750,000 [2],[12],[52],[53] 127,000 [10],[13]   750,000 [2],[12],[52],[53]   127,000 [10],[13]                
Cost 750,000 [2],[12],[52],[53] 144,000 [10],[13]   750,000 [2],[12],[52],[53]   144,000 [10],[13]                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,467,000 [1],[2],[3] 703,000 [7],[10],[25]   8,467,000 [1],[2],[3]   703,000 [7],[10],[25]                
Cost 8,478,000 [1],[2],[3] 700,000 [7],[10],[25]   8,478,000 [1],[2],[3]   700,000 [7],[10],[25]                
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (4,000) [1],[2],[3] 5,000 [7],[10],[25]   (4,000) [1],[2],[3]   5,000 [7],[10],[25]                
Cost (3,000) [1],[2],[3] 4,000 [7],[10],[25]   (3,000) [1],[2],[3]   4,000 [7],[10],[25]                
Investment, Identifier [Axis]: Infoniqa Holdings GmbH, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,812,000 [1],[2],[15],[28] 2,729,000 [7],[10],[16],[29]   2,812,000 [1],[2],[15],[28]   2,729,000 [7],[10],[16],[29]                
Cost 2,904,000 [1],[2],[15],[28] 2,902,000 [7],[10],[16],[29]   2,904,000 [1],[2],[15],[28]   2,902,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,648,000 [1],[2],[15],[28] 5,495,000 [7],[10],[16],[29]   5,648,000 [1],[2],[15],[28]   5,495,000 [7],[10],[16],[29]                
Cost 6,797,000 [1],[2],[15],[28] 6,791,000 [7],[10],[16],[29]   6,797,000 [1],[2],[15],[28]   6,791,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Innovad Group II BV, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,284,000 1,261,000   1,284,000   1,261,000                
Investment, Identifier [Axis]: Innovative XCessories & Services, LLC, Automotive, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,386,000 [1],[4],[23] 2,277,000 [7],[8],[50]   2,386,000 [1],[4],[23]   2,277,000 [7],[8],[50]                
Cost 2,854,000 [1],[4],[23] 2,854,000 [7],[8],[50]   2,854,000 [1],[4],[23]   2,854,000 [7],[8],[50]                
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,334,000 1,310,000   1,334,000   1,310,000                
Investment, Identifier [Axis]: Interstellar Group B.V., Delayed Draw Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 56,000 55,000   56,000   55,000                
Investment, Identifier [Axis]: Interstellar Group B.V., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,276,000 [1],[2],[15],[17] 1,239,000 [7],[10],[16],[18]   1,276,000 [1],[2],[15],[17]   1,239,000 [7],[10],[16],[18]                
Cost 1,193,000 [1],[2],[15],[17] 1,191,000 [7],[10],[16],[18]   1,193,000 [1],[2],[15],[17]   1,191,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Iqor US Inc., Services: Business, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,654,000 [1],[4],[26] 2,658,000 [7],[8],[25]   2,654,000 [1],[4],[26]   2,658,000 [7],[8],[25]                
Cost 2,704,000 [1],[4],[26] 2,711,000 [7],[8],[25]   2,704,000 [1],[4],[26]   2,711,000 [7],[8],[25]                
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 509,000 [1],[2],[4],[5],[6] 553,000 [7],[8],[9],[10],[11]   509,000 [1],[2],[4],[5],[6]   553,000 [7],[8],[9],[10],[11]                
Cost 1,160,000 [1],[2],[4],[5],[6] 1,160,000 [7],[8],[9],[10],[11]   1,160,000 [1],[2],[4],[5],[6]   1,160,000 [7],[8],[9],[10],[11]                
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 757,000 744,000   757,000   744,000                
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Trading Companies & Distributors, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,539,000 [1],[2],[15],[32] 4,436,000 [7],[10],[16],[46]   4,539,000 [1],[2],[15],[32]   4,436,000 [7],[10],[16],[46]                
Cost 4,048,000 [1],[2],[15],[32] 4,044,000 [7],[10],[16],[46]   4,048,000 [1],[2],[15],[32]   4,044,000 [7],[10],[16],[46]                
Investment, Identifier [Axis]: Ivanti Software, Inc., High Tech Industries, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,528,000 [1],[4],[6] 3,383,000 [7],[8],[11]   3,528,000 [1],[4],[6]   3,383,000 [7],[8],[11]                
Cost 5,989,000 [1],[4],[6] 5,989,000 [7],[8],[11]   5,989,000 [1],[4],[6]   5,989,000 [7],[8],[11]                
Investment, Identifier [Axis]: JF Acquisition, LLC, Automotive, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,610,000 [1],[2],[26] 3,575,000 [7],[10],[25]   3,610,000 [1],[2],[26]   3,575,000 [7],[10],[25]                
Cost 3,733,000 [1],[2],[26] 3,747,000 [7],[10],[25]   3,733,000 [1],[2],[26]   3,747,000 [7],[10],[25]                
Investment, Identifier [Axis]: JSC Tekers Holdings, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       0        
Investment, Identifier [Axis]: JSC Tekers Holdings, Common Stock, Controlled Investment                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       0        
Investment, Identifier [Axis]: JSC Tekers Holdings, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       6,197,000        
Investment, Identifier [Axis]: JSC Tekers Holdings, Preferred Stock, Controlled Investment                            
Summary of Investment Holdings [Line Items]                            
Fair value   0       0       0        
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), Aerospace & Defense, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,089,000 [1],[2],[15],[28] 4,009,000 [7],[10],[16],[29]   4,089,000 [1],[2],[15],[28]   4,009,000 [7],[10],[16],[29]                
Cost 4,085,000 [1],[2],[15],[28] 4,082,000 [7],[10],[16],[29]   4,085,000 [1],[2],[15],[28]   4,082,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), Aerospace & Defense, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,606,000 [1],[2],[15],[23] 6,592,000 [7],[10],[16],[24]   6,606,000 [1],[2],[15],[23]   6,592,000 [7],[10],[16],[24]                
Cost 6,581,000 [1],[2],[15],[23] 6,576,000 [7],[10],[16],[24]   6,581,000 [1],[2],[15],[23]   6,576,000 [7],[10],[16],[24]                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 422,000   0   422,000                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Other Financial, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[14]   7,617,000       7,617,000                
Cost [7],[10],[14]   7,571,000       7,571,000                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Other Financial, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[14]   (2,000)       (2,000)                
Cost [7],[10],[14]   (4,000)       (4,000)                
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 490,000   0   490,000                
Investment, Identifier [Axis]: Jedson Engineering, Inc., Engineering & Construction Management, First Lien Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,650,000 [2],[43] 2,650,000 [10],[44]   2,650,000 [2],[43]   2,650,000 [10],[44]                
Cost 2,650,000 [2],[43] 2,650,000 [10],[44]   2,650,000 [2],[43]   2,650,000 [10],[44]                
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,608,000 3,511,000   3,608,000   3,511,000                
Cost 3,609,000 3,609,000   3,609,000   3,609,000                
Investment, Identifier [Axis]: Jocassee Partners LLC                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 65,000,000 65,000,000   65,000,000   65,000,000                
Total contributed capital 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 40,930,000 [15] 40,088,000 [16]   40,930,000 [15]   40,088,000 [16]                
Cost 35,158,000 [15] 35,158,000 [16]   35,158,000 [15]   35,158,000 [16]                
Investment, Identifier [Axis]: Jocassee Partners LLC, Joint Venture                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 65,000,000 65,000,000   65,000,000   65,000,000                
Investment, Identifier [Axis]: Jocassee Partners LLC, Member Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 40,930,000 40,088,000   40,930,000   40,088,000       37,601,000        
Investment, Identifier [Axis]: Jon Bidco Limited, Capex & Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,425,000 1,441,000   1,425,000   1,441,000                
Investment, Identifier [Axis]: Jon Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,451,000 [1],[2],[15],[48] 3,477,000 [7],[10],[16],[49]   3,451,000 [1],[2],[15],[48]   3,477,000 [7],[10],[16],[49]                
Cost 3,819,000 [1],[2],[15],[48] 3,813,000 [7],[10],[16],[49]   3,819,000 [1],[2],[15],[48]   3,813,000 [7],[10],[16],[49]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,680,000 [1],[2],[6] 2,745,000 [7],[10],[11]   2,680,000 [1],[2],[6]   2,745,000 [7],[10],[11]                
Cost 2,738,000 [1],[2],[6] 2,736,000 [7],[10],[11]   2,738,000 [1],[2],[6]   2,736,000 [7],[10],[11]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[23] 675,000     675,000                    
Cost [1],[2],[23] 675,000     675,000                    
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 162,000 [2],[12] 115,000 [10],[13]   162,000 [2],[12]   115,000 [10],[13]                
Cost 97,000 [2],[12] 97,000 [10],[13]   97,000 [2],[12]   97,000 [10],[13]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (16,000) [1],[2],[6] (6,000) [7],[10],[11]   (16,000) [1],[2],[6]   (6,000) [7],[10],[11]                
Cost (7,000) [1],[2],[6] (7,000) [7],[10],[11]   (7,000) [1],[2],[6]   (7,000) [7],[10],[11]                
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 418,000 418,000   418,000   418,000                
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,545,000 [1],[2],[27] 5,545,000 [7],[10],[50]   5,545,000 [1],[2],[27]   5,545,000 [7],[10],[50]                
Cost 5,527,000 [1],[2],[27] 5,535,000 [7],[10],[50]   5,527,000 [1],[2],[27]   5,535,000 [7],[10],[50]                
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, Partnership Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 191,000 [2],[12] 191,000 [10],[13]   191,000 [2],[12]   191,000 [10],[13]                
Cost 203,000 [2],[12] 203,000 [10],[13]   203,000 [2],[12]   203,000 [10],[13]                
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 153,000 153,000   153,000   153,000                
Investment, Identifier [Axis]: Kano Laboratories LLC, Delayed Draw Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,830,000 2,830,000   2,830,000   2,830,000                
Investment, Identifier [Axis]: Kemmerer Operations LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 908,000   0   908,000                
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,793,000 1,181,000   1,793,000   1,181,000       0        
Investment, Identifier [Axis]: Kemmerer Operations, LLC, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 1,715,000 $ 1,565,000   $ 1,715,000   $ 1,565,000       0        
Investment, interest rate, paid in kind 15.00% 15.00%   15.00%   15.00%                
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Metals & Mining, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 1,793,000 [2],[4],[12] $ 1,181,000 [8],[10],[13]   $ 1,793,000 [2],[4],[12]   $ 1,181,000 [8],[10],[13]                
Cost 1,589,000 [2],[4],[12] 1,589,000 [8],[10],[13]   1,589,000 [2],[4],[12]   1,589,000 [8],[10],[13]                
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Metals & Mining, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,715,000 [2],[4] 1,565,000 [8],[10]   1,715,000 [2],[4]   1,565,000 [8],[10]                
Cost $ 1,715,000 [2],[4] $ 1,565,000 [8],[10]   $ 1,715,000 [2],[4]   $ 1,565,000 [8],[10]                
Investment, interest rate, paid in kind 15.00% [2],[4] 15.00% [8],[10]   15.00% [2],[4]   15.00% [8],[10]                
Investment, Identifier [Axis]: Kene Acquisition, Inc. (En Engineering), Oil & Gas Equipment & Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 7,021,000 [1],[2],[6] $ 7,027,000 [7],[10],[11]   $ 7,021,000 [1],[2],[6]   $ 7,027,000 [7],[10],[11]                
Cost 7,058,000 [1],[2],[6] 7,071,000 [7],[10],[11]   7,058,000 [1],[2],[6]   7,071,000 [7],[10],[11]                
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,117,000 [1],[2],[6] 9,125,000 [7],[10],[11]   9,117,000 [1],[2],[6]   9,125,000 [7],[10],[11]                
Cost 9,064,000 [1],[2],[6] 9,080,000 [7],[10],[11]   9,064,000 [1],[2],[6]   9,080,000 [7],[10],[11]                
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 599,000 [2],[12] 577,000 [10],[13]   599,000 [2],[12]   577,000 [10],[13]                
Cost 638,000 [2],[12] 638,000 [10],[13]   638,000 [2],[12]   638,000 [10],[13]                
Investment, Identifier [Axis]: Kona Buyer, LLC, High Tech Industries, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,561,000 [1],[2],[3] 8,623,000 [7],[10],[14]   8,561,000 [1],[2],[3]   8,623,000 [7],[10],[14]                
Cost 8,547,000 [1],[2],[3] 8,615,000 [7],[10],[14]   8,547,000 [1],[2],[3]   8,615,000 [7],[10],[14]                
Investment, Identifier [Axis]: Lambir Bidco Limited, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,797,000 1,766,000   1,797,000   1,766,000                
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,562,000 [1],[2],[15],[17] 4,397,000 [7],[10],[16],[18]   4,562,000 [1],[2],[15],[17]   4,397,000 [7],[10],[16],[18]                
Cost 4,800,000 [1],[2],[15],[17] 4,794,000 [7],[10],[16],[18]   4,800,000 [1],[2],[15],[17]   4,794,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,414,000 [2],[15] 1,409,000 [10],[16]   1,414,000 [2],[15]   1,409,000 [10],[16]                
Cost $ 1,534,000 [2],[15] $ 1,533,000 [10],[16]   $ 1,534,000 [2],[15]   $ 1,533,000 [10],[16]                
Investment, interest rate, paid in kind 12.00% [2],[15] 12.00% [10],[16]   12.00% [2],[15]   12.00% [10],[16]                
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 255,000 $ 298,000   $ 255,000   $ 298,000                
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 674,000 [1],[2],[3],[15] 633,000 [7],[10],[16],[24]   674,000 [1],[2],[3],[15]   633,000 [7],[10],[16],[24]                
Cost 688,000 [1],[2],[3],[15] 645,000 [7],[10],[16],[24]   688,000 [1],[2],[3],[15]   645,000 [7],[10],[16],[24]                
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 34,000 [1],[2],[3],[15] 34,000 [7],[10],[14],[16]   34,000 [1],[2],[3],[15]   34,000 [7],[10],[14],[16]                
Cost 35,000 [1],[2],[3],[15] 35,000 [7],[10],[14],[16]   35,000 [1],[2],[3],[15]   35,000 [7],[10],[14],[16]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,139,000 [1],[2],[6] 10,150,000 [7],[10],[11]   10,139,000 [1],[2],[6]   10,150,000 [7],[10],[11]                
Cost 10,100,000 [1],[2],[6] 10,119,000 [7],[10],[11]   10,100,000 [1],[2],[6]   10,119,000 [7],[10],[11]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 72,000 [2] 65,000 [10],[13]   72,000 [2]   65,000 [10],[13]                
Cost 52,000 [2] 52,000 [10],[13]   52,000 [2]   52,000 [10],[13]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (28,000) [1],[2],[6] (32,000) [7],[10],[11]   (28,000) [1],[2],[6]   (32,000) [7],[10],[11]                
Cost (37,000) [1],[2],[6] (39,000) [7],[10],[11]   (37,000) [1],[2],[6]   (39,000) [7],[10],[11]                
Investment, Identifier [Axis]: LeadsOnline, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 93,000 [1],[26] 100,000 [7],[25]   93,000 [1],[26]   100,000 [7],[25]                
Cost 94,000 [1],[26] 94,000 [7],[25]   94,000 [1],[26]   94,000 [7],[25]                
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,305,000 [6] 8,455,000 [11]   8,305,000 [6]   8,455,000 [11]                
Cost 9,211,000 [6] 8,784,000 [11]   9,211,000 [6]   8,784,000 [11]                
Investment, Identifier [Axis]: Legal Solutions Holdings, Business Services, Senior Subordinated Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 39,000 [2],[5],[15],[43] 0 [9],[10],[44]   39,000 [2],[5],[15],[43]   0 [9],[10],[44]                
Cost $ 10,129,000 [2],[5],[15],[43] $ 10,129,000 [9],[10],[44]   $ 10,129,000 [2],[5],[15],[43]   $ 10,129,000 [9],[10],[44]                
Investment, interest rate, paid in kind 16.00% [2],[5],[43] 16.00% [9],[10],[44]   16.00% [2],[5],[43]   16.00% [9],[10],[44]                
Investment, Identifier [Axis]: Liberty Steel Holdings USA Inc., Industrial Other, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 19,863,000 [1],[2],[3] $ 19,846,000 [7],[10],[22]   $ 19,863,000 [1],[2],[3]   $ 19,846,000 [7],[10],[22]                
Cost 19,864,000 [1],[2],[3] 19,847,000 [7],[10],[22]   19,864,000 [1],[2],[3]   19,847,000 [7],[10],[22]                
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,958,000 [1],[2],[4],[6] 2,980,000 [7],[8],[10],[11]   2,958,000 [1],[2],[4],[6]   2,980,000 [7],[8],[10],[11]                
Cost 3,174,000 [1],[2],[4],[6] 3,194,000 [7],[8],[10],[11]   3,174,000 [1],[2],[4],[6]   3,194,000 [7],[8],[10],[11]                
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (170,000) [1],[2],[4],[6] (168,000) [7],[8],[10],[11]   (170,000) [1],[2],[4],[6]   (168,000) [7],[8],[10],[11]                
Cost 0 [1],[2],[4],[6] 0 [7],[8],[10],[11]   0 [1],[2],[4],[6]   0 [7],[8],[10],[11]                
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 848,000 [1],[2],[6] 837,000 [7],[10],[11]   848,000 [1],[2],[6]   837,000 [7],[10],[11]                
Cost 856,000 [1],[2],[6] 855,000 [7],[10],[11]   856,000 [1],[2],[6]   855,000 [7],[10],[11]                
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 138,000 138,000   138,000   138,000                
Investment, Identifier [Axis]: LogMeIn, Inc., High Tech Industries, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,109,000 [1],[4],[26] 1,253,000 [7],[8],[25]   1,109,000 [1],[4],[26]   1,253,000 [7],[8],[25]                
Cost 1,942,000 [1],[4],[26] 1,942,000 [7],[8],[25]   1,942,000 [1],[4],[26]   1,942,000 [7],[8],[25]                
Investment, Identifier [Axis]: Long Term Care Group, Inc., Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,505,000 [1],[2],[26] 7,816,000 [7],[10],[25]   6,505,000 [1],[2],[26]   7,816,000 [7],[10],[25]                
Cost 7,864,000 [1],[2],[26] 7,897,000 [7],[10],[25]   7,864,000 [1],[2],[26]   7,897,000 [7],[10],[25]                
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,121,000 [1],[2],[6] 4,123,000 [7],[10],[25]   4,121,000 [1],[2],[6]   4,123,000 [7],[10],[25]                
Cost 4,089,000 [1],[2],[6] 4,096,000 [7],[10],[25]   4,089,000 [1],[2],[6]   4,096,000 [7],[10],[25]                
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 906,000 [2],[12] 781,000 [10],[13]   906,000 [2],[12]   781,000 [10],[13]                
Cost 747,000 [2],[12] 747,000 [10],[13]   747,000 [2],[12]   747,000 [10],[13]                
Investment, Identifier [Axis]: MC Group Ventures Corporation, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 296,000 296,000   296,000   296,000                
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction and Building, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 792,000 [1],[2],[26] 835,000 [7],[10],[25]   792,000 [1],[2],[26]   835,000 [7],[10],[25]                
Cost 895,000 [1],[2],[26] 897,000 [7],[10],[25]   895,000 [1],[2],[26]   897,000 [7],[10],[25]                
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction and Building, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 25,000 [2],[12] 54,000 [10],[13]   25,000 [2],[12]   54,000 [10],[13]                
Cost 77,000 [2],[12] 77,000 [10],[13]   77,000 [2],[12]   77,000 [10],[13]                
Investment, Identifier [Axis]: MVC Automotive Group GmbH, Bridge Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 7,149,000 $ 7,149,000   $ 7,149,000   $ 7,149,000       7,149,000        
Investment, interest rate, paid in kind 1.50% 6.00%   1.50%   6.00%                
Investment, Identifier [Axis]: MVC Automotive Group GmbH, Common Equity Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 13,011,000 $ 9,675,000   $ 13,011,000   $ 9,675,000       7,699,000        
Investment, Identifier [Axis]: MVC Automotive Group Gmbh, Automotive, Bridge Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,149,000 [2],[15],[43] 7,149,000 [10],[16],[44]   7,149,000 [2],[15],[43]   7,149,000 [10],[16],[44]                
Cost $ 7,149,000 [2],[15],[43] 7,149,000 [10],[16],[44]   $ 7,149,000 [2],[15],[43]   7,149,000 [10],[16],[44]                
Investment, interest rate, paid in kind [2],[15],[43] 1.50%     1.50%                    
Investment, Identifier [Axis]: MVC Automotive Group Gmbh, Automotive, Common Equity interest                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 13,011,000 [2],[12],[15],[43] 9,675,000 [10],[13],[16],[44]   $ 13,011,000 [2],[12],[15],[43]   9,675,000 [10],[13],[16],[44]                
Cost 9,553,000 [2],[12],[15],[43] 9,553,000 [10],[13],[16],[44]   9,553,000 [2],[12],[15],[43]   9,553,000 [10],[13],[16],[44]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, General Partnership Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 42,000 45,000   42,000   45,000       188,000        
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Investment Funds & Vehicles, General Partnership Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 42,000 [12],[15],[43] 45,000 [16],[44]   42,000 [12],[15],[43]   45,000 [16],[44]                
Cost 225,000 [12],[15],[43] 225,000 [16],[44]   225,000 [12],[15],[43]   225,000 [16],[44]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Investment Funds & Vehicles, Limited Partnership Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,677,000 [12],[15],[43] 1,793,000 [16],[44]   1,677,000 [12],[15],[43]   1,793,000 [16],[44]                
Cost 8,899,000 [12],[15],[43] 8,899,000 [16],[44]   8,899,000 [12],[15],[43]   8,899,000 [16],[44]                
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Limited Partnership Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,677,000 1,793,000   1,677,000   1,793,000       7,376,000        
Investment, Identifier [Axis]: Magnetite XIX, Limited, Multi-Sector Holdings, Subordinated Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,453,000 [4],[6],[15] 4,450,000 [8],[16]   4,453,000 [4],[6],[15]   4,450,000 [8],[16]                
Cost 5,107,000 [4],[6],[15] 5,107,000 [8],[16]   5,107,000 [4],[6],[15]   5,107,000 [8],[16]                
Investment, Identifier [Axis]: Magnetite XIX, Limited, Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,301,000 [4],[15] 7,992,000 [8],[16]   8,301,000 [4],[15]   7,992,000 [8],[16]                
Cost 9,391,000 [4],[15] 9,377,000 [8],[16]   9,391,000 [4],[15]   9,377,000 [8],[16]                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,913,000 [1],[2],[15],[28] 2,093,000 [7],[10],[16],[29]   1,913,000 [1],[2],[15],[28]   2,093,000 [7],[10],[16],[29]                
Cost 2,221,000 [1],[2],[15],[28] 2,219,000 [7],[10],[16],[29]   2,221,000 [1],[2],[15],[28]   2,219,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 25,000 [1],[2],[15],[17] 40,000 [7],[10],[16],[18]   25,000 [1],[2],[15],[17]   40,000 [7],[10],[16],[18]                
Cost 42,000 [1],[2],[15],[17] 42,000 [7],[10],[16],[18]   42,000 [1],[2],[15],[17]   42,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 24,000 24,000   24,000   24,000                
Investment, Identifier [Axis]: Marmoutier Holding B.V., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 108,000 106,000   108,000   106,000                
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,756,000 [1],[2],[3] 10,794,000 [7],[10],[14]   10,756,000 [1],[2],[3]   10,794,000 [7],[10],[14]                
Cost 10,739,000 [1],[2],[3] 10,786,000 [7],[10],[14]   10,739,000 [1],[2],[3]   10,786,000 [7],[10],[14]                
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,577,000 [1],[2],[54] 1,217,000 [7],[10],[55]   1,577,000 [1],[2],[54]   1,217,000 [7],[10],[55]                
Cost 1,574,000 [1],[2],[54] 1,215,000 [7],[10],[55]   1,574,000 [1],[2],[54]   1,215,000 [7],[10],[55]                
Investment, Identifier [Axis]: Marshall Excelsior Co., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 55,000 413,000   55,000   413,000                
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,896,000 [1],[2],[3] 2,903,000 [7],[10],[14]   2,896,000 [1],[2],[3]   2,903,000 [7],[10],[14]                
Cost 2,868,000 [1],[2],[3] 2,872,000 [7],[10],[14]   2,868,000 [1],[2],[3]   2,872,000 [7],[10],[14]                
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,002,000 [1],[2],[39] 3,894,000 [7],[10],[40]   4,002,000 [1],[2],[39]   3,894,000 [7],[10],[40]                
Cost 4,260,000 [1],[2],[39] 4,257,000 [7],[10],[40]   4,260,000 [1],[2],[39]   4,257,000 [7],[10],[40]                
Investment, Identifier [Axis]: Median B.V., Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,666,000 [1],[15],[33] 7,449,000 [7],[16],[31]   7,666,000 [1],[15],[33]   7,449,000 [7],[16],[31]                
Cost 9,809,000 [1],[15],[33] 9,797,000 [7],[16],[31]   9,809,000 [1],[15],[33]   9,797,000 [7],[16],[31]                
Investment, Identifier [Axis]: Medical Solutions Parent Holdings, Inc., Healthcare, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,001,000 [1],[3] 4,067,000 [7],[25]   4,001,000 [1],[3]   4,067,000 [7],[25]                
Cost 4,383,000 [1],[3] 4,382,000 [7],[25]   4,383,000 [1],[3]   4,382,000 [7],[25]                
Investment, Identifier [Axis]: Mercell Holding AS, Capex Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 750,000 797,000   750,000   797,000                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class A Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 115,000 [2],[12],[15] 116,000 [10],[13],[16]   115,000 [2],[12],[15]   116,000 [10],[13],[16]                
Cost 111,000 [2],[12],[15] 111,000 [10],[13],[16]   111,000 [2],[12],[15]   111,000 [10],[13],[16]                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class B Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 54,000 [2],[12],[15] 0 [10],[13],[16]   54,000 [2],[12],[15]   0 [10],[13],[16]                
Cost 0 [2],[12],[15] 0 [10],[13],[16]   0 [2],[12],[15]   0 [10],[13],[16]                
Investment, Identifier [Axis]: Mercell Holding AS, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,925,000 [1],[2],[15],[56] 3,102,000 [7],[10],[16],[57]   2,925,000 [1],[2],[15],[56]   3,102,000 [7],[10],[16],[57]                
Cost 3,129,000 [1],[2],[15],[56] 3,124,000 [7],[10],[16],[57]   3,129,000 [1],[2],[15],[56]   3,124,000 [7],[10],[16],[57]                
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited, Capex Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 956,000 968,000   956,000   968,000                
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited., Non-durable Consumer Goods, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,586,000 [1],[2],[15],[19] 7,634,000 [7],[10],[16],[20]   7,586,000 [1],[2],[15],[19]   7,634,000 [7],[10],[16],[20]                
Cost 8,334,000 [1],[2],[15],[19] 8,324,000 [7],[10],[16],[20]   8,334,000 [1],[2],[15],[19]   8,324,000 [7],[10],[16],[20]                
Investment, Identifier [Axis]: Murphy Midco Limited, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 361,000 407,000   361,000   407,000                
Investment, Identifier [Axis]: Murphy Midco Limited, Media, Diversified & Production, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,224,000 [1],[2],[15],[33] 1,150,000 [7],[10],[16],[34]   1,224,000 [1],[2],[15],[33]   1,150,000 [7],[10],[16],[34]                
Cost 1,316,000 [1],[2],[15],[33] 1,258,000 [7],[10],[16],[34]   1,316,000 [1],[2],[15],[33]   1,258,000 [7],[10],[16],[34]                
Investment, Identifier [Axis]: Music Reports, Inc., Media & Entertainment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,849,000 [1],[2],[26] 6,816,000 [7],[10],[25]   6,849,000 [1],[2],[26]   6,816,000 [7],[10],[25]                
Cost 6,817,000 [1],[2],[26] 6,810,000 [7],[10],[25]   6,817,000 [1],[2],[26]   6,810,000 [7],[10],[25]                
Investment, Identifier [Axis]: NF Holdco, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,105,000 0   1,105,000   0                
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 6,203,000     6,203,000                    
Cost [1],[2],[3] 6,203,000     6,203,000                    
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] (33,000)     (33,000)                    
Cost [1],[2],[3] (33,000)     (33,000)                    
Investment, Identifier [Axis]: NGS US Finco, LLC (f/k/a Dresser Natural Gas Solutions), Energy Equipment & Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,687,000 [1],[2],[26] 4,697,000 [7],[10],[25]   4,687,000 [1],[2],[26]   4,697,000 [7],[10],[25]                
Cost 4,682,000 [1],[2],[26] 4,693,000 [7],[10],[25]   4,682,000 [1],[2],[26]   4,693,000 [7],[10],[25]                
Investment, Identifier [Axis]: NPM Investments 28 B.V., Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,121,000 [1],[2],[15],[17] 2,084,000 [7],[10],[16],[18]   2,121,000 [1],[2],[15],[17]   2,084,000 [7],[10],[16],[18]                
Cost 1,906,000 [1],[2],[15],[17] 1,904,000 [7],[10],[16],[18]   1,906,000 [1],[2],[15],[17]   1,904,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: NPM Investments 28 BV, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 471,000 463,000   471,000   463,000                
Investment, Identifier [Axis]: Napa Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 17,070,000 [1],[2],[15],[35] 16,963,000 [7],[10],[16],[36]   17,070,000 [1],[2],[15],[35]   16,963,000 [7],[10],[16],[36]                
Cost 19,549,000 [1],[2],[15],[35] 19,527,000 [7],[10],[16],[36]   19,549,000 [1],[2],[15],[35]   19,527,000 [7],[10],[16],[36]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class A Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 465,000 [2],[12] 300,000 [10],[13]   465,000 [2],[12]   300,000 [10],[13]                
Cost 459,000 [2],[12] 459,000 [10],[13]   459,000 [2],[12]   459,000 [10],[13]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class B Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,000 [2],[12] 0 [10],[13]   5,000 [2],[12]   0 [10],[13]                
Cost 51,000 [2],[12] 51,000 [10],[13]   51,000 [2],[12]   51,000 [10],[13]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,370,000 [1],[2],[26] 5,096,000 [7],[10],[11]   5,370,000 [1],[2],[26]   5,096,000 [7],[10],[11]                
Cost 5,543,000 [1],[2],[26] 5,553,000 [7],[10],[11]   5,543,000 [1],[2],[26]   5,553,000 [7],[10],[11]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 72,000 [1],[2],[6] 5,000 [7],[10],[11]   72,000 [1],[2],[6]   5,000 [7],[10],[11]                
Cost 113,000 [1],[2],[6] 112,000 [7],[10],[11]   113,000 [1],[2],[6]   112,000 [7],[10],[11]                
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,180,000 1,180,000   1,180,000   1,180,000                
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[25]   2,649,000       2,649,000                
Cost [7],[10],[25]   2,663,000       2,663,000                
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,312,000 [1],[2],[21] 2,918,000 [7],[10],[22]   2,312,000 [1],[2],[21]   2,918,000 [7],[10],[22]                
Cost 2,327,000 [1],[2],[21] 2,920,000 [7],[10],[22]   2,327,000 [1],[2],[21]   2,920,000 [7],[10],[22]                
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 329,000     329,000                    
Cost [1],[2],[3] 331,000     331,000                    
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 3                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 2,932,000     2,932,000                    
Cost [1],[2],[3] 2,928,000     2,928,000                    
Investment, Identifier [Axis]: NeoxCo, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 489,000 0   489,000   0                
Investment, Identifier [Axis]: NeoxCo, Internet Software & Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[15],[28] 2,031,000     2,031,000                    
Cost [1],[2],[15],[28] 2,035,000     2,035,000                    
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 374,000 443,000   374,000   443,000                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[15],[33] 1,631,000     1,631,000                    
Cost [1],[2],[15],[33] 1,766,000     1,766,000                    
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[16],[34]   1,508,000       1,508,000                
Cost [7],[10],[16],[34]   1,684,000       1,684,000                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[16],[34]   184,000       184,000                
Cost [7],[10],[16],[34]   202,000       202,000                
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[15],[33] 189,000     189,000                    
Cost [1],[2],[15],[33] 202,000     202,000                    
Investment, Identifier [Axis]: Northstar Recycling, LLC, Environmental Industries, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,443,000 [1],[2],[3] 2,446,000 [7],[10],[11]   2,443,000 [1],[2],[3]   2,446,000 [7],[10],[11]                
Cost 2,430,000 [1],[2],[3] 2,434,000 [7],[10],[11]   2,430,000 [1],[2],[3]   2,434,000 [7],[10],[11]                
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Capex & Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 809,000 809,000   809,000   809,000                
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,315,000 [1],[2],[15],[35] 3,406,000 [7],[10],[16],[36]   3,315,000 [1],[2],[15],[35]   3,406,000 [7],[10],[16],[36]                
Cost 3,669,000 [1],[2],[15],[35] 3,667,000 [7],[10],[16],[36]   3,669,000 [1],[2],[15],[35]   3,667,000 [7],[10],[16],[36]                
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 425,000 [1],[2],[15],[23] 443,000 [7],[10],[16],[24]   425,000 [1],[2],[15],[23]   443,000 [7],[10],[16],[24]                
Cost 450,000 [1],[2],[15],[23] 449,000 [7],[10],[16],[24]   450,000 [1],[2],[15],[23]   449,000 [7],[10],[16],[24]                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,496,000 [1],[2],[3] 5,501,000 [7],[10],[25]   5,496,000 [1],[2],[3]   5,501,000 [7],[10],[25]                
Cost 5,478,000 [1],[2],[3] 5,488,000 [7],[10],[25]   5,478,000 [1],[2],[3]   5,488,000 [7],[10],[25]                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 226,000 [2],[12] 226,000 [10],[13]   226,000 [2],[12]   226,000 [10],[13]                
Cost 211,000 [2],[12] 211,000 [10],[13]   211,000 [2],[12]   211,000 [10],[13]                
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (18,000) [1],[2],[3] (21,000) [7],[10],[25]   (18,000) [1],[2],[3]   (21,000) [7],[10],[25]                
Cost (22,000) [1],[2],[3] (23,000) [7],[10],[25]   (22,000) [1],[2],[3]   (23,000) [7],[10],[25]                
Investment, Identifier [Axis]: OA Buyer, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,555,000 [1],[2],[3] 3,567,000 [7],[10],[24]   3,555,000 [1],[2],[3]   3,567,000 [7],[10],[24]                
Cost 3,541,000 [1],[2],[3] 3,556,000 [7],[10],[24]   3,541,000 [1],[2],[3]   3,556,000 [7],[10],[24]                
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,097,000 [1],[2],[3] 743,000 [7],[10],[24]   1,097,000 [1],[2],[3]   743,000 [7],[10],[24]                
Cost 1,093,000 [1],[2],[3] 739,000 [7],[10],[24]   1,093,000 [1],[2],[3]   739,000 [7],[10],[24]                
Investment, Identifier [Axis]: OAC Holdings I Corp, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 254,000 607,000   254,000   607,000                
Investment, Identifier [Axis]: OG III B.V., Containers & Glass Products, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,243,000 [1],[2],[15],[17] 3,310,000 [7],[10],[16],[18]   3,243,000 [1],[2],[15],[17]   3,310,000 [7],[10],[16],[18]                
Cost 3,676,000 [1],[2],[15],[17] 3,674,000 [7],[10],[16],[18]   3,676,000 [1],[2],[15],[17]   3,674,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 384,000 187,000   384,000   187,000                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,190,000 [1],[2],[6] 2,190,000 [7],[10],[11]   2,190,000 [1],[2],[6]   2,190,000 [7],[10],[11]                
Cost 2,221,000 [1],[2],[6] 2,219,000 [7],[10],[11]   2,221,000 [1],[2],[6]   2,219,000 [7],[10],[11]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[14]   2,206,000       2,206,000                
Cost [7],[10],[14]   2,206,000       2,206,000                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan1                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 2,206,000     2,206,000                    
Cost [1],[2],[3] 2,209,000     2,209,000                    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan2                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 4,571,000     4,571,000                    
Cost [1],[2],[3] 4,572,000     4,572,000                    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, LP Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 360,000 [2],[12] 221,000 [10],[13]   360,000 [2],[12]   221,000 [10],[13]                
Cost 351,000 [2],[12] 208,000 [10],[13]   351,000 [2],[12]   208,000 [10],[13]                
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 43,000 [1],[2],[6] (6,000) [7],[10],[11]   43,000 [1],[2],[6]   (6,000) [7],[10],[11]                
Cost 45,000 [1],[2],[6] (3,000) [7],[10],[11]   45,000 [1],[2],[6]   (3,000) [7],[10],[11]                
Investment, Identifier [Axis]: Offen Inc., Transportation: Cargo, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,699,000 [2],[4],[26] 3,627,000 [8],[10],[25]   3,699,000 [2],[4],[26]   3,627,000 [8],[10],[25]                
Cost 3,699,000 [2],[4],[26] 3,702,000 [8],[10],[25]   3,699,000 [2],[4],[26]   3,702,000 [8],[10],[25]                
Investment, Identifier [Axis]: Omni Intermediate Holdings, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 2,289,000   0   2,289,000                
Investment, Identifier [Axis]: Omni Intermediate Holdings, LLC, Transportation, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,181,000 [1],[2],[3] 5,995,000 [7],[10],[14]   8,181,000 [1],[2],[3]   5,995,000 [7],[10],[14]                
Cost 8,374,000 [1],[2],[3] 6,098,000 [7],[10],[14]   8,374,000 [1],[2],[3]   6,098,000 [7],[10],[14]                
Investment, Identifier [Axis]: Options Technology Ltd., Computer Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,229,000 [1],[2],[15],[27] 2,251,000 [7],[10],[16],[50]   2,229,000 [1],[2],[15],[27]   2,251,000 [7],[10],[16],[50]                
Cost 2,262,000 [1],[2],[15],[27] 2,266,000 [7],[10],[16],[50]   2,262,000 [1],[2],[15],[27]   2,266,000 [7],[10],[16],[50]                
Investment, Identifier [Axis]: Oracle Vision Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,830,000 [1],[2],[15],[33] 2,753,000 [7],[10],[16],[34]   2,830,000 [1],[2],[15],[33]   2,753,000 [7],[10],[16],[34]                
Cost 3,154,000 [1],[2],[15],[33] 3,151,000 [7],[10],[16],[34]   3,154,000 [1],[2],[15],[33]   3,151,000 [7],[10],[16],[34]                
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 351,000 [1],[2],[15],[17] 342,000 [7],[10],[16],[18]   351,000 [1],[2],[15],[17]   342,000 [7],[10],[16],[18]                
Cost 395,000 [1],[2],[15],[17] 395,000 [7],[10],[16],[18]   395,000 [1],[2],[15],[17]   395,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 582,000 [1],[2],[6],[15] 577,000 [7],[10],[11],[16]   582,000 [1],[2],[6],[15]   577,000 [7],[10],[11],[16]                
Cost 584,000 [1],[2],[6],[15] 584,000 [7],[10],[11],[16]   584,000 [1],[2],[6],[15]   584,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, Class A-2 Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 45,000 [2],[12] 41,000 [10],[13]   45,000 [2],[12]   41,000 [10],[13]                
Cost 29,000 [2],[12] 29,000 [10],[13]   29,000 [2],[12]   29,000 [10],[13]                
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,162,000 [1],[2],[6] 8,172,000 [7],[10],[11]   8,162,000 [1],[2],[6]   8,172,000 [7],[10],[11]                
Cost 8,091,000 [1],[2],[6] 8,116,000 [7],[10],[11]   8,091,000 [1],[2],[6]   8,116,000 [7],[10],[11]                
Investment, Identifier [Axis]: PDQ.Com Corporation, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 6,885,000 6,885,000   6,885,000   6,885,000                
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 740,000 727,000   740,000   727,000                
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 825,000 [1],[2],[15],[17] 829,000 [7],[10],[16],[18]   825,000 [1],[2],[15],[17]   829,000 [7],[10],[16],[18]                
Cost 826,000 [1],[2],[15],[17] 825,000 [7],[10],[16],[18]   826,000 [1],[2],[15],[17]   825,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 832,000 [1],[2],[6],[15] 842,000 [7],[10],[11],[16]   832,000 [1],[2],[6],[15]   842,000 [7],[10],[11],[16]                
Cost 844,000 [1],[2],[6],[15] 844,000 [7],[10],[11],[16]   844,000 [1],[2],[6],[15]   844,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: Panoche Energy Center LLC, Electric, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,312,000 [2] 4,628,000 [10]   4,312,000 [2]   4,628,000 [10]                
Cost 4,185,000 [2] 4,430,000 [10]   4,185,000 [2]   4,430,000 [10]                
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), Health Care Equipment, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,708,000 [1],[2],[15],[28] 2,638,000 [7],[10],[16],[29]   2,708,000 [1],[2],[15],[28]   2,638,000 [7],[10],[16],[29]                
Cost $ 2,821,000 [1],[2],[15],[28] $ 2,807,000 [7],[10],[16],[29]   $ 2,821,000 [1],[2],[15],[28]   $ 2,807,000 [7],[10],[16],[29]                
Investment, interest rate, paid in kind 0.75% [1],[2],[15],[28] 0.75% [7],[10],[16],[29]   0.75% [1],[2],[15],[28]   0.75% [7],[10],[16],[29]                
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), Health Care Equipment, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 1,461,000 [1],[2],[3],[15] $ 1,455,000 [7],[10],[14],[16]   $ 1,461,000 [1],[2],[3],[15]   $ 1,455,000 [7],[10],[14],[16]                
Cost 1,500,000 [1],[2],[3],[15] 1,500,000 [7],[10],[14],[16]   1,500,000 [1],[2],[3],[15]   1,500,000 [7],[10],[14],[16]                
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), Diversified Financial Services, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,587,000 [1],[2],[15],[17] 2,702,000 [7],[10],[16],[18]   2,587,000 [1],[2],[15],[17]   2,702,000 [7],[10],[16],[18]                
Cost 2,676,000 [1],[2],[15],[17] 2,850,000 [7],[10],[16],[18]   2,676,000 [1],[2],[15],[17]   2,850,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), Diversified Financial Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,169,000 [1],[2],[6],[15] 3,159,000 [7],[10],[11],[16]   3,169,000 [1],[2],[6],[15]   3,159,000 [7],[10],[11],[16]                
Cost 3,268,000 [1],[2],[6],[15] 3,264,000 [7],[10],[11],[16]   3,268,000 [1],[2],[6],[15]   3,264,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class A                            
Summary of Investment Holdings [Line Items]                            
Fair value 177,000 [2],[15] 165,000 [10],[16]   177,000 [2],[15]   165,000 [10],[16]                
Cost 182,000 [2],[15] 182,000 [10],[16]   182,000 [2],[15]   182,000 [10],[16]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class B                            
Summary of Investment Holdings [Line Items]                            
Fair value 172,000 [2],[15] 162,000 [10],[16]   172,000 [2],[15]   162,000 [10],[16]                
Cost 182,000 [2],[15] 182,000 [10],[16]   182,000 [2],[15]   182,000 [10],[16]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class C                            
Summary of Investment Holdings [Line Items]                            
Fair value 166,000 [2],[15] 157,000 [10],[16]   166,000 [2],[15]   157,000 [10],[16]                
Cost 182,000 [2],[15] 182,000 [10],[16]   182,000 [2],[15]   182,000 [10],[16]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class D                            
Summary of Investment Holdings [Line Items]                            
Fair value 161,000 [2],[15] 158,000 [10],[16]   161,000 [2],[15]   158,000 [10],[16]                
Cost 182,000 [2],[15] 181,000 [10],[16]   182,000 [2],[15]   181,000 [10],[16]                
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class E                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,185,000 [2],[15] 8,154,000 [10],[16]   8,185,000 [2],[15]   8,154,000 [10],[16]                
Cost 9,274,000 [2],[15] 9,273,000 [10],[16]   9,274,000 [2],[15]   9,273,000 [10],[16]                
Investment, Identifier [Axis]: Permaconn BidCo Pty Ltd, Tele-communications, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,700,000 [1],[2],[15],[47] 2,728,000 [7],[10],[16],[45]   2,700,000 [1],[2],[15],[47]   2,728,000 [7],[10],[16],[45]                
Cost 2,867,000 [1],[2],[15],[47] 2,864,000 [7],[10],[16],[45]   2,867,000 [1],[2],[15],[47]   2,864,000 [7],[10],[16],[45]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,212,000 [1],[2],[23] 1,210,000 [7],[10],[11]   1,212,000 [1],[2],[23]   1,210,000 [7],[10],[11]                
Cost 1,210,000 [1],[2],[23] 1,209,000 [7],[10],[11]   1,210,000 [1],[2],[23]   1,209,000 [7],[10],[11]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 933,000 [2],[12] 823,000 [10],[13]   933,000 [2],[12]   823,000 [10],[13]                
Cost 741,000 [2],[12] 741,000 [10],[13]   741,000 [2],[12]   741,000 [10],[13]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (8,000) [1],[2],[23] (9,000) [7],[10],[11]   (8,000) [1],[2],[23]   (9,000) [7],[10],[11]                
Cost (9,000) [1],[2],[23] (9,000) [7],[10],[11]   (9,000) [1],[2],[23]   (9,000) [7],[10],[11]                
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 545,000 545,000   545,000   545,000                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 49,055,000 [1],[2],[6] 48,490,000 [7],[10],[11]   49,055,000 [1],[2],[6]   48,490,000 [7],[10],[11]                
Cost $ 49,056,000 [1],[2],[6] $ 48,487,000 [7],[10],[11]   $ 49,056,000 [1],[2],[6]   $ 48,487,000 [7],[10],[11]                
Investment, interest rate, paid in kind 4.00% [1],[2],[6] 4.00% [7],[10],[11]   4.00% [1],[2],[6]   4.00% [7],[10],[11]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class A                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 301,000 [2],[12] $ 438,000 [10],[13]   $ 301,000 [2],[12]   $ 438,000 [10],[13]                
Cost 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class B                            
Summary of Investment Holdings [Line Items]                            
Fair value 102,000 [2],[12] 148,000 [10],[13]   102,000 [2],[12]   148,000 [10],[13]                
Cost 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class CC                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Cost 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class D                            
Summary of Investment Holdings [Line Items]                            
Fair value 29,000 [2],[12] 42,000 [10],[13]   29,000 [2],[12]   42,000 [10],[13]                
Cost 0 [2],[12] 0 [10],[13]   0 [2],[12]   0 [10],[13]                
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 997,000 [1],[2],[4],[26] 987,000 [7],[8],[10],[25]   997,000 [1],[2],[4],[26]   987,000 [7],[8],[10],[25]                
Cost 997,000 [1],[2],[4],[26] 997,000 [7],[8],[10],[25]   997,000 [1],[2],[4],[26]   997,000 [7],[8],[10],[25]                
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, Research & Consulting Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 12,500,000 [1],[2],[6] 12,510,000 [7],[10],[11]   12,500,000 [1],[2],[6]   12,510,000 [7],[10],[11]                
Cost 12,473,000 [1],[2],[6] 12,496,000 [7],[10],[11]   12,473,000 [1],[2],[6]   12,496,000 [7],[10],[11]                
Investment, Identifier [Axis]: Premium Invest, Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,758,000 [1],[2],[15],[28] 5,656,000 [7],[10],[16],[29]   5,758,000 [1],[2],[15],[28]   5,656,000 [7],[10],[16],[29]                
Cost 5,812,000 [1],[2],[15],[28] 5,804,000 [7],[10],[16],[29]   5,812,000 [1],[2],[15],[28]   5,804,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Premium Invest, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,933,000 2,882,000   2,933,000   2,882,000                
Investment, Identifier [Axis]: Preqin MC Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,716,000 [1],[2],[15],[23] 2,719,000 [7],[10],[16],[50]   2,716,000 [1],[2],[15],[23]   2,719,000 [7],[10],[16],[50]                
Cost 2,722,000 [1],[2],[15],[23] 2,719,000 [7],[10],[16],[50]   2,722,000 [1],[2],[15],[23]   2,719,000 [7],[10],[16],[50]                
Investment, Identifier [Axis]: Process Equipment, Inc. (ProcessBarron), Industrial Air & Material Handling Equipment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 305,000 [1],[2],[3] 4,907,000 [7],[10],[14]   305,000 [1],[2],[3]   4,907,000 [7],[10],[14]                
Cost 329,000 [1],[2],[3] 5,430,000 [7],[10],[14]   329,000 [1],[2],[3]   5,430,000 [7],[10],[14]                
Investment, Identifier [Axis]: Process Equipment, Inc. (ProcessBarron), Industrial Air & Material Handling Equipment, First Lien Senior Secured Term Loan1                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,919,000 [1],[2],[23] 304,000 [7],[10],[25]   4,919,000 [1],[2],[23]   304,000 [7],[10],[25]                
Cost 5,307,000 [1],[2],[23] 337,000 [7],[10],[25]   5,307,000 [1],[2],[23]   337,000 [7],[10],[25]                
Investment, Identifier [Axis]: Professional Datasolutions, Inc. (PDI), Application Software, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,758,000 [1],[2],[6] 1,751,000 [7],[10],[11]   1,758,000 [1],[2],[6]   1,751,000 [7],[10],[11]                
Cost 1,812,000 [1],[2],[6] 1,821,000 [7],[10],[11]   1,812,000 [1],[2],[6]   1,821,000 [7],[10],[11]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 306,000 484,000   306,000   484,000                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,638,000 [1],[2],[27] 1,624,000 [7],[10],[50]   1,638,000 [1],[2],[27]   1,624,000 [7],[10],[50]                
Cost 1,620,000 [1],[2],[27] 1,619,000 [7],[10],[50]   1,620,000 [1],[2],[27]   1,619,000 [7],[10],[50]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 189,000 [2],[12] 172,000 [10],[13]   189,000 [2],[12]   172,000 [10],[13]                
Cost 161,000 [2],[12] 161,000 [10],[13]   161,000 [2],[12]   161,000 [10],[13]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 175,000 [1],[2],[27] (7,000) [7],[10],[50]   175,000 [1],[2],[27]   (7,000) [7],[10],[50]                
Cost 169,000 [1],[2],[27] (8,000) [7],[10],[50]   169,000 [1],[2],[27]   (8,000) [7],[10],[50]                
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Second Lien Senior Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 75,000 [2] 74,000 [10]   75,000 [2]   74,000 [10]                
Cost 81,000 [2] 81,000 [10]   81,000 [2]   81,000 [10]                
Investment, Identifier [Axis]: Proppants Holding, LLC, Energy: Oil & Gas, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Cost 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,406,000 [1],[2],[15],[28] 1,365,000 [7],[10],[16],[29]   1,406,000 [1],[2],[15],[28]   1,365,000 [7],[10],[16],[29]                
Cost 1,571,000 [1],[2],[15],[28] 1,569,000 [7],[10],[16],[29]   1,571,000 [1],[2],[15],[28]   1,569,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,049,000 [1],[2],[15],[28] 2,017,000 [7],[10],[16],[29]   2,049,000 [1],[2],[15],[28]   2,017,000 [7],[10],[16],[29]                
Cost 2,277,000 [1],[2],[15],[28] 2,275,000 [7],[10],[16],[29]   2,277,000 [1],[2],[15],[28]   2,275,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Protego Bidco B.V., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 807,000 792,000   807,000   792,000                
Investment, Identifier [Axis]: QPE7 SPV1 BidCo Pty Ltd, Consumer Cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,769,000 [1],[2],[15],[19] 1,821,000 [7],[10],[16],[20]   1,769,000 [1],[2],[15],[19]   1,821,000 [7],[10],[16],[20]                
Cost 1,966,000 [1],[2],[15],[19] 1,965,000 [7],[10],[16],[20]   1,966,000 [1],[2],[15],[19]   1,965,000 [7],[10],[16],[20]                
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value [2],[12] 3,000     3,000                    
Cost [2],[12] 3,000     3,000                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 588,000     588,000                    
Cost [1],[2],[3] 588,000     588,000                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value [2],[12] 144,000     144,000                    
Cost [2],[12] 144,000     144,000                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] (7,000)     (7,000)                    
Cost [1],[2],[3] (7,000)     (7,000)                    
Investment, Identifier [Axis]: Qualified Industries, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 242,000 0   242,000   0                
Investment, Identifier [Axis]: Questel Unite, Business Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,727,000 [1],[2],[6],[15] 6,692,000 [7],[10],[11],[16]   6,727,000 [1],[2],[6],[15]   6,692,000 [7],[10],[11],[16]                
Cost 6,818,000 [1],[2],[6],[15] 6,815,000 [7],[10],[11],[16]   6,818,000 [1],[2],[6],[15]   6,815,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: R1 Holdings, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,820,000 2,623,000   1,820,000   2,623,000                
Investment, Identifier [Axis]: R1 Holdings, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,601,000 1,601,000   1,601,000   1,601,000                
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,688,000 [1],[2],[23] 9,873,000 [7],[10],[14]   10,688,000 [1],[2],[23]   9,873,000 [7],[10],[14]                
Cost 10,665,000 [1],[2],[23] 9,873,000 [7],[10],[14]   10,665,000 [1],[2],[23]   9,873,000 [7],[10],[14]                
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 408,000 [1],[2],[23] 403,000 [7],[10],[14]   408,000 [1],[2],[23]   403,000 [7],[10],[14]                
Cost 405,000 [1],[2],[23] 403,000 [7],[10],[14]   405,000 [1],[2],[23]   403,000 [7],[10],[14]                
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 12,658,000 [1],[2],[3],[4] 12,658,000 [7],[8],[10],[11]   12,658,000 [1],[2],[3],[4]   12,658,000 [7],[8],[10],[11]                
Cost 12,658,000 [1],[2],[3],[4] 12,658,000 [7],[8],[10],[11]   12,658,000 [1],[2],[3],[4]   12,658,000 [7],[8],[10],[11]                
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 346,000 [1],[2],[3],[4] (25,000) [7],[8],[10],[11]   346,000 [1],[2],[3],[4]   (25,000) [7],[8],[10],[11]                
Cost 370,000 [1],[2],[3],[4] 0 [7],[8],[10],[11]   370,000 [1],[2],[3],[4]   0 [7],[8],[10],[11]                
Investment, Identifier [Axis]: RA Outdoors, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 864,000 1,235,000   864,000   1,235,000                
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,583,000 [1],[2],[28] 9,438,000 [7],[10],[46]   9,583,000 [1],[2],[28]   9,438,000 [7],[10],[46]                
Cost 9,255,000 [1],[2],[28] 9,245,000 [7],[10],[46]   9,255,000 [1],[2],[28]   9,245,000 [7],[10],[46]                
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,410,000 [1],[2],[26] 1,274,000 [7],[10],[11]   1,410,000 [1],[2],[26]   1,274,000 [7],[10],[11]                
Cost 1,407,000 [1],[2],[26] 1,264,000 [7],[10],[11]   1,407,000 [1],[2],[26]   1,264,000 [7],[10],[11]                
Investment, Identifier [Axis]: RPX Corporation, Research & Consulting Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,160,000 [1],[2],[26] 7,144,000 [7],[10],[11]   7,160,000 [1],[2],[26]   7,144,000 [7],[10],[11]                
Cost 7,136,000 [1],[2],[26] 7,174,000 [7],[10],[11]   7,136,000 [1],[2],[26]   7,174,000 [7],[10],[11]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class A Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 1,000 [8],[10]   0 [2],[4],[12]   1,000 [8],[10]                
Cost 4,000 [2],[4],[12] 4,000 [8],[10]   4,000 [2],[4],[12]   4,000 [8],[10]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class B Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Cost 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class C Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 62,000 [2],[4],[12] 155,000 [8],[10],[13]   62,000 [2],[4],[12]   155,000 [8],[10],[13]                
Cost 450,000 [2],[4],[12] 450,000 [8],[10],[13]   450,000 [2],[4],[12]   450,000 [8],[10],[13]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Cost 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,815,000 [1],[2],[4],[21] 9,761,000 [7],[8],[10],[22]   8,815,000 [1],[2],[4],[21]   9,761,000 [7],[8],[10],[22]                
Cost 9,279,000 [1],[2],[4],[21] 10,032,000 [7],[8],[10],[22]   9,279,000 [1],[2],[4],[21]   10,032,000 [7],[8],[10],[22]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,183,000 [1],[2],[4],[21] 1,480,000 [7],[8],[10],[22]   2,183,000 [1],[2],[4],[21]   1,480,000 [7],[8],[10],[22]                
Cost 2,381,000 [1],[2],[4],[21] 1,587,000 [7],[8],[10],[22]   2,381,000 [1],[2],[4],[21]   1,587,000 [7],[8],[10],[22]                
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,587,000 2,381,000   1,587,000   2,381,000                
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 12,749,000 [1],[2],[3] 12,708,000 [7],[10],[14]   12,749,000 [1],[2],[3]   12,708,000 [7],[10],[14]                
Cost 12,723,000 [1],[2],[3] 12,727,000 [7],[10],[14]   12,723,000 [1],[2],[3]   12,727,000 [7],[10],[14]                
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 532,000 [2],[12] 533,000 [10],[13]   532,000 [2],[12]   533,000 [10],[13]                
Cost 533,000 [2],[12] 533,000 [10],[13]   533,000 [2],[12]   533,000 [10],[13]                
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 304,000 [1],[2],[3] 238,000 [7],[10],[14]   304,000 [1],[2],[3]   238,000 [7],[10],[14]                
Cost 300,000 [1],[2],[3] 239,000 [7],[10],[14]   300,000 [1],[2],[3]   239,000 [7],[10],[14]                
Investment, Identifier [Axis]: Randys Holdings, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 4,412,000 4,412,000   4,412,000   4,412,000                
Investment, Identifier [Axis]: Randys Holdings, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,513,000 1,571,000   1,513,000   1,571,000                
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,501,000 [1],[2],[3] 11,392,000 [7],[10],[11]   11,501,000 [1],[2],[3]   11,392,000 [7],[10],[11]                
Cost 11,359,000 [1],[2],[3] 11,379,000 [7],[10],[11]   11,359,000 [1],[2],[3]   11,379,000 [7],[10],[11]                
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, Partnership Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 151,000 [2],[12] 125,000 [10],[13]   151,000 [2],[12]   125,000 [10],[13]                
Cost 187,000 [2],[12] 187,000 [10],[13]   187,000 [2],[12]   187,000 [10],[13]                
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,204,000 [1],[2],[6] 4,556,000 [7],[10],[11]   4,204,000 [1],[2],[6]   4,556,000 [7],[10],[11]                
Cost 4,698,000 [1],[2],[6] 4,706,000 [7],[10],[11]   4,698,000 [1],[2],[6]   4,706,000 [7],[10],[11]                
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, Partnership Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 65,000 [2],[12] 152,000 [10],[13]   65,000 [2],[12]   152,000 [10],[13]                
Cost 197,000 [2],[12] 197,000 [10],[13]   197,000 [2],[12]   197,000 [10],[13]                
Investment, Identifier [Axis]: Rep Seko Merger Sub LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 579,000 725,000   579,000   725,000                
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,049,000 [1],[2],[4],[6] 4,243,000 [7],[8],[10],[11]   3,049,000 [1],[2],[4],[6]   4,243,000 [7],[8],[10],[11]                
Cost 5,107,000 [1],[2],[4],[6] 5,107,000 [7],[8],[10],[11]   5,107,000 [1],[2],[4],[6]   5,107,000 [7],[8],[10],[11]                
Investment, Identifier [Axis]: Resonetics, LLC, Health Care Equipment, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,967,000 [1],[2],[6] 3,926,000 [7],[10],[11]   3,967,000 [1],[2],[6]   3,926,000 [7],[10],[11]                
Cost 3,944,000 [1],[2],[6] 3,942,000 [7],[10],[11]   3,944,000 [1],[2],[6]   3,942,000 [7],[10],[11]                
Investment, Identifier [Axis]: Reward Gateway (UK) Ltd, Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 617,000 600,000   617,000   600,000                
Investment, Identifier [Axis]: Reward Gateway (UK) Ltd, Precious Metals & Minerals, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,927,000 [1],[2],[15],[33] 2,840,000 [7],[10],[16],[34]   2,927,000 [1],[2],[15],[33]   2,840,000 [7],[10],[16],[34]                
Cost 3,233,000 [1],[2],[15],[33] 3,230,000 [7],[10],[16],[34]   3,233,000 [1],[2],[15],[33]   3,230,000 [7],[10],[16],[34]                
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Finance Companies, Structured - Junior Note                            
Summary of Investment Holdings [Line Items]                            
Fair value [2],[15] 9,378,000     9,378,000                    
Cost [2],[15] 9,382,000     9,382,000                    
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Structured Junior Note                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 22,914,000 0   22,914,000   0                
Investment, Identifier [Axis]: Riedel Beheer B.V., Food & Beverage, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,107,000 [1],[2],[15],[17] 2,162,000 [7],[10],[16],[18]   2,107,000 [1],[2],[15],[17]   2,162,000 [7],[10],[16],[18]                
Cost 2,250,000 [1],[2],[15],[17] 2,248,000 [7],[10],[16],[18]   2,250,000 [1],[2],[15],[17]   2,248,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Rocade Holdings LLC, LP Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 0   0   0                
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, LP Units                            
Summary of Investment Holdings [Line Items]                            
Fair value [2],[12] 0     0                    
Cost [2],[12] 0     0                    
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, Preferred LP Units                            
Summary of Investment Holdings [Line Items]                            
Fair value [2] 45,000,000     45,000,000                    
Cost [2] $ 45,000,000     $ 45,000,000                    
Investment, interest rate, paid in kind [2] 6.00%     6.00%                    
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred Equity                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 40,000,000 0   $ 40,000,000   0                
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred LP Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 45,000,000 0   45,000,000   0                
Investment, Identifier [Axis]: Royal Buyer, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,082,000 2,209,000   2,082,000   2,209,000                
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,930,000 [1],[2],[3] 10,808,000 [7],[10],[14]   10,930,000 [1],[2],[3]   10,808,000 [7],[10],[14]                
Cost 10,900,000 [1],[2],[3] 10,791,000 [7],[10],[14]   10,900,000 [1],[2],[3]   10,791,000 [7],[10],[14]                
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 380,000 [1],[2],[3] 377,000 [7],[10],[14]   380,000 [1],[2],[3]   377,000 [7],[10],[14]                
Cost 376,000 [1],[2],[3] 374,000 [7],[10],[14]   376,000 [1],[2],[3]   374,000 [7],[10],[14]                
Investment, Identifier [Axis]: Royal Buyer, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,171,000 [1],[2],[6] 9,238,000 [7],[10],[11]   9,171,000 [1],[2],[6]   9,238,000 [7],[10],[11]                
Cost 9,397,000 [1],[2],[6] 9,445,000 [7],[10],[11]   9,397,000 [1],[2],[6]   9,445,000 [7],[10],[11]                
Investment, Identifier [Axis]: SBP Holdings LP, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,469,000 0   1,469,000   0                
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 11,978,000     11,978,000                    
Cost [1],[2],[3] 11,979,000     11,979,000                    
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 140,000     140,000                    
Cost [1],[2],[3] 140,000     140,000                    
Investment, Identifier [Axis]: SBP Holdings LP, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 887,000 0   887,000   0                
Investment, Identifier [Axis]: SISU ACQUISITIONCO., INC., Aerospace & Defense, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,623,000 [1],[2],[6] 6,376,000 [7],[10],[11]   6,623,000 [1],[2],[6]   6,376,000 [7],[10],[11]                
Cost 6,828,000 [1],[2],[6] 6,840,000 [7],[10],[11]   6,828,000 [1],[2],[6]   6,840,000 [7],[10],[11]                
Investment, Identifier [Axis]: SMART Financial Operations, LLC, Banking, Finance, Insurance & Real Estate, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 110,000 [2],[4],[12] 110,000 [8],[10],[13]   110,000 [2],[4],[12]   110,000 [8],[10],[13]                
Cost 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Investment, Identifier [Axis]: SN BUYER, LLC, Health Care Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,938,000 [1],[2],[3] 10,951,000 [7],[10],[11]   10,938,000 [1],[2],[3]   10,951,000 [7],[10],[11]                
Cost 10,981,000 [1],[2],[3] 10,972,000 [7],[10],[11]   10,981,000 [1],[2],[3]   10,972,000 [7],[10],[11]                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 22,072,000 [1],[2],[3] 22,041,000 [7],[10],[14]   22,072,000 [1],[2],[3]   22,041,000 [7],[10],[14]                
Cost 22,060,000 [1],[2],[3] 22,046,000 [7],[10],[14]   22,060,000 [1],[2],[3]   22,046,000 [7],[10],[14]                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 519,000 [2],[12] 516,000 [10],[13]   519,000 [2],[12]   516,000 [10],[13]                
Cost 516,000 [2],[12] 516,000 [10],[13]   516,000 [2],[12]   516,000 [10],[13]                
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (47,000) [1],[2],[3] (50,000) [7],[10],[14]   (47,000) [1],[2],[3]   (50,000) [7],[10],[14]                
Cost (47,000) [1],[2],[3] (49,000) [7],[10],[14]   (47,000) [1],[2],[3]   (49,000) [7],[10],[14]                
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 4,794,000 4,664,000   4,794,000   4,664,000                
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,468,000 [1],[2],[15],[30] 2,383,000 [7],[10],[16],[31]   2,468,000 [1],[2],[15],[30]   2,383,000 [7],[10],[16],[31]                
Cost 2,574,000 [1],[2],[15],[30] 2,566,000 [7],[10],[16],[31]   2,574,000 [1],[2],[15],[30]   2,566,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,785,000 [1],[2],[6] 11,792,000 [7],[10],[11]   11,785,000 [1],[2],[6]   11,792,000 [7],[10],[11]                
Cost 11,742,000 [1],[2],[6] 11,762,000 [7],[10],[11]   11,742,000 [1],[2],[6]   11,762,000 [7],[10],[11]                
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, Preferred Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 491,000 [2],[12] 460,000 [10],[13]   491,000 [2],[12]   460,000 [10],[13]                
Cost 372,000 [2],[12] 372,000 [10],[13]   372,000 [2],[12]   372,000 [10],[13]                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Acquisition Capex Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 846,000 1,751,000   846,000   1,751,000                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., CAF Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 445,000 0   445,000   0                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,498,000 [1],[2],[15],[28] 1,939,000 [7],[10],[16],[29]   2,498,000 [1],[2],[15],[28]   1,939,000 [7],[10],[16],[29]                
Cost 2,332,000 [1],[2],[15],[28] 1,784,000 [7],[10],[16],[29]   2,332,000 [1],[2],[15],[28]   1,784,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,943,000 [1],[2],[15],[58] 3,886,000 [7],[10],[16],[59]   3,943,000 [1],[2],[15],[58]   3,886,000 [7],[10],[16],[59]                
Cost 3,740,000 [1],[2],[15],[58] 3,738,000 [7],[10],[16],[59]   3,740,000 [1],[2],[15],[58]   3,738,000 [7],[10],[16],[59]                
Investment, Identifier [Axis]: Scaled Agile, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 416,000 416,000   416,000   416,000                
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,706,000 [1],[2],[3] 1,716,000 [7],[10],[14]   1,706,000 [1],[2],[3]   1,716,000 [7],[10],[14]                
Cost 1,699,000 [1],[2],[3] 1,701,000 [7],[10],[14]   1,699,000 [1],[2],[3]   1,701,000 [7],[10],[14]                
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (4,000) [1],[2],[3] (3,000) [7],[10],[14]   (4,000) [1],[2],[3]   (3,000) [7],[10],[14]                
Cost (5,000) [1],[2],[3] (6,000) [7],[10],[14]   (5,000) [1],[2],[3]   (6,000) [7],[10],[14]                
Investment, Identifier [Axis]: Scaled Agile, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 336,000 336,000   336,000   336,000                
Investment, Identifier [Axis]: Scout Bidco B.V., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,311,000 2,270,000   2,311,000   2,270,000                
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,477,000 [1],[2],[15],[28] 6,310,000 [7],[10],[16],[18]   6,477,000 [1],[2],[15],[28]   6,310,000 [7],[10],[16],[18]                
Cost 6,293,000 [1],[2],[15],[28] 6,286,000 [7],[10],[16],[18]   6,293,000 [1],[2],[15],[28]   6,286,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (15,000) [1],[2],[15],[28] (21,000) [7],[10],[16],[18]   (15,000) [1],[2],[15],[28]   (21,000) [7],[10],[16],[18]                
Cost (23,000) [1],[2],[15],[28] (24,000) [7],[10],[16],[18]   (23,000) [1],[2],[15],[28]   (24,000) [7],[10],[16],[18]                
Investment, Identifier [Axis]: Scout Bidco B.V., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,049,000 1,030,000   1,049,000   1,030,000                
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan                            
Summary of Investment Holdings [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                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 6,020,000 $ 6,020,000   $ 6,020,000   $ 6,020,000       0        
Investment, interest rate, paid in kind 5.00% 5.00%   5.00%   5.00%                
Investment, Identifier [Axis]: Security Holdings B.V, Common Equity Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value   $ 0       $ 0       24,825,000        
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series A, Controlled                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 467,000 575,000   $ 467,000   575,000       0        
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series B, Controlled                            
Summary of Investment Holdings [Line Items]                            
Fair value 43,652,000 53,728,000   43,652,000   53,728,000       0        
Investment, Identifier [Axis]: Security Holdings B.V, Senior Subordinated Loan                            
Summary of Investment Holdings [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                            
Summary of Investment Holdings [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                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 10,680,000 $ 10,534,000   $ 10,680,000   $ 10,534,000       0        
Investment, interest rate, paid in kind 3.10% 3.10%   3.10%   3.10%                
Investment, Identifier [Axis]: Security Holdings B.V, Senior Unsecured Term Loan                            
Summary of Investment Holdings [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                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 2,052,000 $ 2,015,000   $ 2,052,000   $ 2,015,000       0        
Investment, interest rate, paid in kind 9.00% 9.00%   9.00%   9.00%                
Investment, Identifier [Axis]: Security Holdings B.V., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 2,173,000 $ 2,134,000   $ 2,173,000   $ 2,134,000                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Bridge Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,020,000 [2],[15],[43] 6,020,000 [10],[16],[44]   6,020,000 [2],[15],[43]   6,020,000 [10],[16],[44]                
Cost $ 6,020,000 [2],[15],[43] $ 6,020,000 [10],[16],[44]   $ 6,020,000 [2],[15],[43]   $ 6,020,000 [10],[16],[44]                
Investment, interest rate, paid in kind 5.00% [2],[15],[43] 5.00% [10],[16],[44]   5.00% [2],[15],[43]   5.00% [10],[16],[44]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Common Stock Series A                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 467,000 [2],[12],[15],[43] $ 575,000 [10],[13],[16],[44]   $ 467,000 [2],[12],[15],[43]   $ 575,000 [10],[13],[16],[44]                
Cost 560,000 [2],[12],[15],[43] 560,000 [10],[13],[16],[44]   560,000 [2],[12],[15],[43]   560,000 [10],[13],[16],[44]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Common Stock Series B                            
Summary of Investment Holdings [Line Items]                            
Fair value 43,652,000 [2],[12],[15],[43] 53,728,000 [10],[13],[16],[44]   43,652,000 [2],[12],[15],[43]   53,728,000 [10],[13],[16],[44]                
Cost 35,192,000 [2],[12],[15],[43] 35,192,000 [10],[13],[16],[44]   35,192,000 [2],[12],[15],[43]   35,192,000 [10],[13],[16],[44]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,680,000 [2],[15],[43] 10,534,000 [10],[16],[44]   10,680,000 [2],[15],[43]   10,534,000 [10],[16],[44]                
Cost $ 10,680,000 [2],[15],[43] $ 10,534,000 [10],[16],[44]   $ 10,680,000 [2],[15],[43]   $ 10,534,000 [10],[16],[44]                
Investment, interest rate, paid in kind 3.10% [2],[15],[43] 3.10% [10],[16],[44]   3.10% [2],[15],[43]   3.10% [10],[16],[44]                
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Unsecured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 2,052,000 [2],[15],[43] $ 2,015,000 [10],[16],[44]   $ 2,052,000 [2],[15],[43]   $ 2,015,000 [10],[16],[44]                
Cost $ 2,164,000 [2],[15],[43] $ 2,164,000 [10],[16],[44]   $ 2,164,000 [2],[15],[43]   $ 2,164,000 [10],[16],[44]                
Investment, interest rate, paid in kind 9.00% [2],[15],[43] 9.00% [10],[16],[44]   9.00% [2],[15],[43]   9.00% [10],[16],[44]                
Investment, Identifier [Axis]: Security Holdings B.V., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 1,086,000 $ 1,067,000   $ 1,086,000   $ 1,067,000                
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 406,000 [1],[2],[15],[28] 348,000 [7],[10],[16],[29]   406,000 [1],[2],[15],[28]   348,000 [7],[10],[16],[29]                
Cost 395,000 [1],[2],[15],[28] 331,000 [7],[10],[16],[29]   395,000 [1],[2],[15],[28]   331,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 476,000 [1],[2],[15],[28] 479,000 [7],[10],[16],[29]   476,000 [1],[2],[15],[28]   479,000 [7],[10],[16],[29]                
Cost 479,000 [1],[2],[15],[28] 479,000 [7],[10],[16],[29]   479,000 [1],[2],[15],[28]   479,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Sereni Capital NV, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,599,000 0   1,599,000   0                
Investment, Identifier [Axis]: Sereni Capital NV, Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 109,000   0   109,000                
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Super Priority First Out                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,105,000 [1],[6] 7,148,000 [7],[11]   7,105,000 [1],[6]   7,148,000 [7],[11]                
Cost 7,229,000 [1],[6] 7,228,000 [7],[11]   7,229,000 [1],[6]   7,228,000 [7],[11]                
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Super Priority Second Out                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,016,000 [1],[5],[6] 1,625,000 [7],[11]   2,016,000 [1],[5],[6]   1,625,000 [7],[11]                
Cost 3,372,000 [1],[5],[6] 3,372,000 [7],[11]   3,372,000 [1],[5],[6]   3,372,000 [7],[11]                
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value [10],[13],[16]   1,200,000       1,200,000                
Cost [10],[13],[16]   1,200,000       1,200,000                
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[14],[16]   33,720,000       33,720,000                
Cost [7],[10],[14],[16]   33,720,000       33,720,000                
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value [2],[12],[15] 1,200,000     1,200,000                    
Cost [2],[12],[15] 1,200,000     1,200,000                    
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3],[15] 33,759,000     33,759,000                    
Cost [1],[2],[3],[15] 33,746,000     33,746,000                    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Joint Venture, 89.01% Member Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 39,814,000 [4],[15] 37,950,000 [8],[16]   39,814,000 [4],[15]   37,950,000 [8],[16]                
Cost 50,221,000 [4],[15] 50,221,000 [8],[16]   50,221,000 [4],[15]   50,221,000 [8],[16]                
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Member Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 39,814,000 37,950,000   39,814,000   37,950,000       0        
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV LLC (Sierra JV)                            
Summary of Investment Holdings [Line Items]                            
Total contributed capital 110,100,000     110,100,000                    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV LLC (Sierra JV) | MMALIC                            
Summary of Investment Holdings [Line Items]                            
Total contributed capital 14,500,000     14,500,000                    
Investment, Identifier [Axis]: Smartling, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,978,000 1,978,000   1,978,000   1,978,000                
Investment, Identifier [Axis]: Smartling, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,176,000 1,176,000   1,176,000   1,176,000                
Investment, Identifier [Axis]: Smartling, Inc., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 13,297,000 [1],[2],[26] 13,393,000 [7],[10],[25]   13,297,000 [1],[2],[26]   13,393,000 [7],[10],[25]                
Cost 13,423,000 [1],[2],[26] 13,445,000 [7],[10],[25]   13,423,000 [1],[2],[26]   13,445,000 [7],[10],[25]                
Investment, Identifier [Axis]: Smartling, Inc., Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (28,000) [1],[2],[26] (24,000) [7],[10],[25]   (28,000) [1],[2],[26]   (24,000) [7],[10],[25]                
Cost (18,000) [1],[2],[26] (19,000) [7],[10],[25]   (18,000) [1],[2],[26]   (19,000) [7],[10],[25]                
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,131,000 [1],[2],[6] 4,196,000 [7],[10],[50]   4,131,000 [1],[2],[6]   4,196,000 [7],[10],[50]                
Cost 4,512,000 [1],[2],[6] 4,521,000 [7],[10],[50]   4,512,000 [1],[2],[6]   4,521,000 [7],[10],[50]                
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 560,000 [1],[2],[6] 565,000 [7],[10],[50]   560,000 [1],[2],[6]   565,000 [7],[10],[50]                
Cost 608,000 [1],[2],[6] 606,000 [7],[10],[50]   608,000 [1],[2],[6]   606,000 [7],[10],[50]                
Investment, Identifier [Axis]: Smile Brands Group, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 38,000   0   38,000                
Investment, Identifier [Axis]: Soho Square III Debtco II SARL, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 3,478,000 3,383,000   3,478,000   3,383,000                
Investment, Identifier [Axis]: Soho Square III Debtco II SARL, Diversified Capital Markets, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,777,000 [2] 5,616,000 [10],[16]   5,777,000 [2]   5,616,000 [10],[16]                
Cost $ 5,178,000 [2] $ 5,177,000 [10],[16]   $ 5,178,000 [2]   $ 5,177,000 [10],[16]                
Investment, interest rate, paid in kind 9.50% [2] 9.50% [10],[16]   9.50% [2]   9.50% [10],[16]                
Investment, Identifier [Axis]: Solo Buyer, L.P., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 1,995,000 $ 1,995,000   $ 1,995,000   $ 1,995,000                
Investment, Identifier [Axis]: Sound Point CLO XX, Ltd., Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 848,000 [4],[15] 1,192,000 [8],[16]   848,000 [4],[15]   1,192,000 [8],[16]                
Cost 2,190,000 [4],[15] 2,205,000 [8],[16]   2,190,000 [4],[15]   2,205,000 [8],[16]                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 399,000 666,000   399,000   666,000                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,889,000 [1],[2],[3] 1,621,000 [7],[10],[14]   1,889,000 [1],[2],[3]   1,621,000 [7],[10],[14]                
Cost 1,887,000 [1],[2],[3] 1,623,000 [7],[10],[14]   1,887,000 [1],[2],[3]   1,623,000 [7],[10],[14]                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 13,000 [1],[2],[54] (4,000) [7],[10],[14]   13,000 [1],[2],[54]   (4,000) [7],[10],[14]                
Cost 12,000 [1],[2],[54] (3,000) [7],[10],[14]   12,000 [1],[2],[54]   (3,000) [7],[10],[14]                
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 141,000 156,000   141,000   156,000                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,810,000 [1],[2],[21] 5,754,000 [7],[10],[22]   5,810,000 [1],[2],[21]   5,754,000 [7],[10],[22]                
Cost 5,779,000 [1],[2],[21] 5,766,000 [7],[10],[22]   5,779,000 [1],[2],[21]   5,766,000 [7],[10],[22]                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (29,000) [1],[2],[21] (35,000) [7],[10],[22]   (29,000) [1],[2],[21]   (35,000) [7],[10],[22]                
Cost (32,000) [1],[2],[21] (34,000) [7],[10],[22]   (32,000) [1],[2],[21]   (34,000) [7],[10],[22]                
Investment, Identifier [Axis]: Spatial Business Systems LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 20,493,000 [1],[2],[3] 20,510,000 [7],[10],[25]   20,493,000 [1],[2],[3]   20,510,000 [7],[10],[25]                
Cost 20,622,000 [1],[2],[3] 20,660,000 [7],[10],[25]   20,622,000 [1],[2],[3]   20,660,000 [7],[10],[25]                
Investment, Identifier [Axis]: Springbrook Software (SBRK Intermediate, Inc.), Enterprise Software & Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,761,000 [1],[2],[23] 2,763,000 [7],[10],[14]   2,761,000 [1],[2],[23]   2,763,000 [7],[10],[14]                
Cost 2,759,000 [1],[2],[23] 2,763,000 [7],[10],[14]   2,759,000 [1],[2],[23]   2,763,000 [7],[10],[14]                
Investment, Identifier [Axis]: Starnmeer B.V., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,480,000 [1],[2],[3],[15] 2,477,000 [7],[10],[11],[16]   2,480,000 [1],[2],[3],[15]   2,477,000 [7],[10],[11],[16]                
Cost 2,471,000 [1],[2],[3],[15] 2,469,000 [7],[10],[11],[16]   2,471,000 [1],[2],[3],[15]   2,469,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: Superjet Buyer, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 12,858,000 [1],[2],[6] 12,860,000 [7],[10],[11]   12,858,000 [1],[2],[6]   12,860,000 [7],[10],[11]                
Cost 12,795,000 [1],[2],[6] 12,818,000 [7],[10],[11]   12,795,000 [1],[2],[6]   12,818,000 [7],[10],[11]                
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (21,000) [1],[2],[6] (26,000) [7],[10],[11]   (21,000) [1],[2],[6]   (26,000) [7],[10],[11]                
Cost (29,000) [1],[2],[6] (31,000) [7],[10],[11]   (29,000) [1],[2],[6]   (31,000) [7],[10],[11]                
Investment, Identifier [Axis]: Syniverse Holdings, Inc., Technology Distributors, Series A Preferred Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,197,000 [2] 6,515,000 [10]   7,197,000 [2]   6,515,000 [10]                
Cost $ 7,945,000 [2] $ 7,945,000 [10]   $ 7,945,000 [2]   $ 7,945,000 [10]                
Investment, interest rate, paid in kind 12.50% [2] 12.50% [10]   12.50% [2]   12.50% [10]                
Investment, Identifier [Axis]: Syntax Systems Ltd, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 1,933,000 $ 1,933,000   $ 1,933,000   $ 1,933,000                
Investment, Identifier [Axis]: Syntax Systems Ltd, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 202,000 337,000   202,000   337,000                
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,819,000 [1],[2],[15],[26] 1,812,000 [7],[10],[16],[25]   1,819,000 [1],[2],[15],[26]   1,812,000 [7],[10],[16],[25]                
Cost 1,991,000 [1],[2],[15],[26] 1,992,000 [7],[10],[16],[25]   1,991,000 [1],[2],[15],[26]   1,992,000 [7],[10],[16],[25]                
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 759,000 [1],[2],[15],[26] 622,000 [7],[10],[16],[25]   759,000 [1],[2],[15],[26]   622,000 [7],[10],[16],[25]                
Cost 802,000 [1],[2],[15],[26] 666,000 [7],[10],[16],[25]   802,000 [1],[2],[15],[26]   666,000 [7],[10],[16],[25]                
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 61,000 [2],[12] 60,000 [10],[13]   61,000 [2],[12]   60,000 [10],[13]                
Cost 50,000 [2],[12] 50,000 [10],[13]   50,000 [2],[12]   50,000 [10],[13]                
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,233,000 [2] 2,110,000 [10]   2,233,000 [2]   2,110,000 [10]                
Cost $ 2,271,000 [2] $ 2,143,000 [10]   $ 2,271,000 [2]   $ 2,143,000 [10]                
Investment, interest rate, paid in kind 7.80% [2] 7.80% [10]   7.80% [2]   7.80% [10]                
Investment, Identifier [Axis]: TANQUERAY BIDCO LIMITED, Technology. First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 1,611,000 [1],[2],[15],[30] $ 1,557,000 [7],[10],[16],[31]   $ 1,611,000 [1],[2],[15],[30]   $ 1,557,000 [7],[10],[16],[31]                
Cost 1,490,000 [1],[2],[15],[30] 1,486,000 [7],[10],[16],[31]   1,490,000 [1],[2],[15],[30]   1,486,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: TSM II Luxco 10 SARL, Chemical & Plastics, Senior Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,700,000 [1],[2],[15] 11,118,000 [7],[10],[16]   11,700,000 [1],[2],[15]   11,118,000 [7],[10],[16]                
Cost $ 11,724,000 [1],[2],[15] $ 11,434,000 [7],[10],[16]   $ 11,724,000 [1],[2],[15]   $ 11,434,000 [7],[10],[16]                
Investment, interest rate, paid in kind 9.30% [1],[2],[15] 9.30% [7],[10],[16]   9.30% [1],[2],[15]   9.30% [7],[10],[16]                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 1,681,000 $ 1,681,000   $ 1,681,000   $ 1,681,000                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 177,000 177,000   177,000   177,000                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 595,000 [1],[2],[3] 591,000 [7],[10],[14]   595,000 [1],[2],[3]   591,000 [7],[10],[14]                
Cost 592,000 [1],[2],[3] 591,000 [7],[10],[14]   592,000 [1],[2],[3]   591,000 [7],[10],[14]                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,000 [2],[12] 5,000 [10],[13]   5,000 [2],[12]   5,000 [10],[13]                
Cost 5,000 [2],[12] 5,000 [10],[13]   5,000 [2],[12]   5,000 [10],[13]                
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (3,000) [1],[2],[3] (4,000) [7],[10],[14]   (3,000) [1],[2],[3]   (4,000) [7],[10],[14]                
Cost (3,000) [1],[2],[3] (4,000) [7],[10],[14]   (3,000) [1],[2],[3]   (4,000) [7],[10],[14]                
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 10,906,000 [1],[2],[21] 10,877,000 [7],[10],[22]   10,906,000 [1],[2],[21]   10,877,000 [7],[10],[22]                
Cost 10,857,000 [1],[2],[21] 10,876,000 [7],[10],[22]   10,857,000 [1],[2],[21]   10,876,000 [7],[10],[22]                
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 234,000 [1],[2],[21] 157,000 [7],[10],[22]   234,000 [1],[2],[21]   157,000 [7],[10],[22]                
Cost 231,000 [1],[2],[21] 157,000 [7],[10],[22]   231,000 [1],[2],[21]   157,000 [7],[10],[22]                
Investment, Identifier [Axis]: Tank Holding Corp, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 625,000 698,000   625,000   698,000                
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Capex Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,118,000 1,088,000   1,118,000   1,088,000                
Investment, Identifier [Axis]: Team Car Care, LLC, Automotive, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,598,000 [1],[2],[4],[6] 11,970,000 [7],[8],[10],[11]   11,598,000 [1],[2],[4],[6]   11,970,000 [7],[8],[10],[11]                
Cost 11,715,000 [1],[2],[4],[6] 12,104,000 [7],[8],[10],[11]   11,715,000 [1],[2],[4],[6]   12,104,000 [7],[8],[10],[11]                
Investment, Identifier [Axis]: Team Services Group, Services: Consumer, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,518,000 [1],[4],[27] 9,345,000 [7],[8],[10],[50]   9,518,000 [1],[4],[27]   9,345,000 [7],[8],[10],[50]                
Cost 9,812,000 [1],[4],[27] 9,837,000 [7],[8],[10],[50]   9,812,000 [1],[4],[27]   9,837,000 [7],[8],[10],[50]                
Investment, Identifier [Axis]: Team Services Group, Services: Consumer, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,700,000 [1],[2],[4],[27] 4,700,000 [7],[8],[10],[50]   4,700,000 [1],[2],[4],[27]   4,700,000 [7],[8],[10],[50]                
Cost 4,975,000 [1],[2],[4],[27] 4,975,000 [7],[8],[10],[50]   4,975,000 [1],[2],[4],[27]   4,975,000 [7],[8],[10],[50]                
Investment, Identifier [Axis]: Techone B.V., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 310,000 203,000   310,000   203,000                
Investment, Identifier [Axis]: Techone B.V., Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,695,000 [1],[2],[15],[17] 3,578,000 [7],[10],[16],[18]   3,695,000 [1],[2],[15],[17]   3,578,000 [7],[10],[16],[18]                
Cost 3,761,000 [1],[2],[15],[17] 3,788,000 [7],[10],[16],[18]   3,761,000 [1],[2],[15],[17]   3,788,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Techone B.V., Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 194,000 [1],[2],[15],[17] 281,000 [7],[10],[16],[18]   194,000 [1],[2],[15],[17]   281,000 [7],[10],[16],[18]                
Cost 189,000 [1],[2],[15],[17] 296,000 [7],[10],[16],[18]   189,000 [1],[2],[15],[17]   296,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 870,000 [1],[2],[6] 871,000 [7],[10],[11]   870,000 [1],[2],[6]   871,000 [7],[10],[11]                
Cost 867,000 [1],[2],[6] 869,000 [7],[10],[11]   867,000 [1],[2],[6]   869,000 [7],[10],[11]                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,363,000 [1],[2],[6] 5,368,000 [7],[10],[11]   5,363,000 [1],[2],[6]   5,368,000 [7],[10],[11]                
Cost 5,339,000 [1],[2],[6] 5,349,000 [7],[10],[11]   5,339,000 [1],[2],[6]   5,349,000 [7],[10],[11]                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (11,000) [1],[2],[6] (13,000) [7],[10],[11]   (11,000) [1],[2],[6]   (13,000) [7],[10],[11]                
Cost (16,000) [1],[2],[6] (16,000) [7],[10],[11]   (16,000) [1],[2],[6]   (16,000) [7],[10],[11]                
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,129,000 1,129,000   1,129,000   1,129,000                
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Partnership Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 230,000 [2],[12] 255,000 [10],[13]   230,000 [2],[12]   255,000 [10],[13]                
Cost 239,000 [2],[12] 239,000 [10],[13]   239,000 [2],[12]   239,000 [10],[13]                
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 262,000 [2] 259,000 [10]   262,000 [2]   259,000 [10]                
Cost $ 262,000 [2] $ 259,000 [10]   $ 262,000 [2]   $ 259,000 [10]                
Investment, interest rate, paid in kind 4.00% [2] 4.00% [10]   4.00% [2]   4.00% [10]                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 794,000 [1],[2],[6] $ 798,000 [7],[10],[11]   $ 794,000 [1],[2],[6]   $ 798,000 [7],[10],[11]                
Cost 780,000 [1],[2],[6] 779,000 [7],[10],[11]   780,000 [1],[2],[6]   779,000 [7],[10],[11]                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (10,000) [1],[2],[6] (9,000) [7],[10],[11]   (10,000) [1],[2],[6]   (9,000) [7],[10],[11]                
Cost (11,000) [1],[2],[6] (12,000) [7],[10],[11]   (11,000) [1],[2],[6]   (12,000) [7],[10],[11]                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,388,000 [1],[2],[27] 3,380,000 [7],[10],[50]   3,388,000 [1],[2],[27]   3,380,000 [7],[10],[50]                
Cost 3,368,000 [1],[2],[27] 3,366,000 [7],[10],[50]   3,368,000 [1],[2],[27]   3,366,000 [7],[10],[50]                
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 827,000 827,000   827,000   827,000                
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 25,512,000 [1],[2],[21] 25,979,000 [7],[10],[22]   25,512,000 [1],[2],[21]   25,979,000 [7],[10],[22]                
Cost 25,439,000 [1],[2],[21] 25,927,000 [7],[10],[22]   25,439,000 [1],[2],[21]   25,927,000 [7],[10],[22]                
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[21] (49,000)     (49,000)                    
Cost [1],[2],[21] (57,000)     (57,000)                    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,875,000 [2] 5,547,000 [10]   5,875,000 [2]   5,547,000 [10]                
Cost $ 5,862,000 [2] $ 5,536,000 [10]   $ 5,862,000 [2]   $ 5,536,000 [10]                
Investment, interest rate, paid in kind 11.00% [2] 11.00% [10]   11.00% [2]   11.00% [10]                
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 3,229,000 $ 2,826,000   $ 3,229,000   $ 2,826,000                
Investment, Identifier [Axis]: The Hilb Group, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 858,000 1,182,000   858,000   1,182,000                
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,911,000 [1],[2],[26] 1,578,000 [7],[10],[25]   1,911,000 [1],[2],[26]   1,578,000 [7],[10],[25]                
Cost 1,920,000 [1],[2],[26] 1,598,000 [7],[10],[25]   1,920,000 [1],[2],[26]   1,598,000 [7],[10],[25]                
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,558,000 [1],[2],[26] 5,560,000 [7],[10],[25]   5,558,000 [1],[2],[26]   5,560,000 [7],[10],[25]                
Cost 5,549,000 [1],[2],[26] 5,558,000 [7],[10],[25]   5,549,000 [1],[2],[26]   5,558,000 [7],[10],[25]                
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 3                            
Summary of Investment Holdings [Line Items]                            
Fair value 14,172,000 [1],[2],[26] 14,178,000 [7],[10],[25]   14,172,000 [1],[2],[26]   14,178,000 [7],[10],[25]                
Cost 14,159,000 [1],[2],[26] 14,183,000 [7],[10],[25]   14,159,000 [1],[2],[26]   14,183,000 [7],[10],[25]                
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Partnership Equity                            
Summary of Investment Holdings [Line Items]                            
Fair value 951,000 [2],[12] 1,019,000 [10],[13]   951,000 [2],[12]   1,019,000 [10],[13]                
Cost 677,000 [2],[12] 677,000 [10],[13]   677,000 [2],[12]   677,000 [10],[13]                
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 12,355,000 [1],[2],[3] 12,322,000 [7],[10],[14]   12,355,000 [1],[2],[3]   12,322,000 [7],[10],[14]                
Cost 12,295,000 [1],[2],[3] 12,289,000 [7],[10],[14]   12,295,000 [1],[2],[3]   12,289,000 [7],[10],[14]                
Investment, Identifier [Axis]: Thompson Rivers LLC                            
Summary of Investment Holdings [Line Items]                            
Total contributed capital                         $ 75,000,000  
Investment, Identifier [Axis]: Thompson Rivers LLC, Investment Funds & Vehicles, 16.0% Member Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 22,024,000 [12] 30,339,000   22,024,000 [12]   30,339,000                
Cost 37,515,000 [12] 46,622,000   37,515,000 [12]   46,622,000                
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 22,024,000 30,339,000   22,024,000   30,339,000       84,438,000        
Investment, Identifier [Axis]: Thompsonn Rivers LLC                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 0   0   0                
Total contributed capital 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,742,000 [1],[6] 5,801,000 [7],[11]   5,742,000 [1],[6]   5,801,000 [7],[11]                
Cost 5,918,000 [1],[6] 5,996,000 [7],[11]   5,918,000 [1],[6]   5,996,000 [7],[11]                
Investment, Identifier [Axis]: Total Safety U.S. Inc., Diversified Support Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,605,000 [1],[2],[6] 3,561,000 [7],[10],[11]   3,605,000 [1],[2],[6]   3,561,000 [7],[10],[11]                
Cost $ 3,605,000 [1],[2],[6] $ 3,561,000 [7],[10],[11]   $ 3,605,000 [1],[2],[6]   $ 3,561,000 [7],[10],[11]                
Investment, interest rate, paid in kind 5.00% [1],[2],[6] 5.00% [7],[10],[11]   5.00% [1],[2],[6]   5.00% [7],[10],[11]                
Investment, Identifier [Axis]: Trader Corporation, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 345,000 $ 345,000   $ 345,000   $ 345,000                
Investment, Identifier [Axis]: Trader Corporation, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,502,000 [1],[2],[15],[60] 4,486,000 [7],[10],[16],[61]   4,502,000 [1],[2],[15],[60]   4,486,000 [7],[10],[16],[61]                
Cost 4,453,000 [1],[2],[15],[60] 4,450,000 [7],[10],[16],[61]   4,453,000 [1],[2],[15],[60]   4,450,000 [7],[10],[16],[61]                
Investment, Identifier [Axis]: Trader Corporation, Technology, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (8,000) [1],[2],[15],[60] (9,000) [7],[10],[16],[61]   (8,000) [1],[2],[15],[60]   (9,000) [7],[10],[16],[61]                
Cost (8,000) [1],[2],[15],[60] (9,000) [7],[10],[16],[61]   (8,000) [1],[2],[15],[60]   (9,000) [7],[10],[16],[61]                
Investment, Identifier [Axis]: Transit Technologies LLC, Software, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 6,035,000 [1],[2],[23] 5,872,000 [7],[10],[50]   6,035,000 [1],[2],[23]   5,872,000 [7],[10],[50]                
Cost 5,993,000 [1],[2],[23] 5,987,000 [7],[10],[50]   5,993,000 [1],[2],[23]   5,987,000 [7],[10],[50]                
Investment, Identifier [Axis]: Transportation Insight, LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 11,026,000 [1],[2],[6] 11,032,000 [7],[10],[11]   11,026,000 [1],[2],[6]   11,032,000 [7],[10],[11]                
Cost 11,137,000 [1],[2],[6] 11,161,000 [7],[10],[11]   11,137,000 [1],[2],[6]   11,161,000 [7],[10],[11]                
Investment, Identifier [Axis]: Trident Maritime Systems, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 14,548,000 [1],[2],[6] 14,570,000 [7],[10]   14,548,000 [1],[2],[6]   14,570,000 [7],[10]                
Cost 14,566,000 [1],[2],[6] 14,597,000 [7],[10]   14,566,000 [1],[2],[6]   14,597,000 [7],[10]                
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Automotive Parts & Equipment, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 18,967,000 [1],[2],[3] 18,756,000 [7],[10],[14]   18,967,000 [1],[2],[3]   18,756,000 [7],[10],[14]                
Cost 18,971,000 [1],[2],[3] 19,017,000 [7],[10],[14]   18,971,000 [1],[2],[3]   19,017,000 [7],[10],[14]                
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 0 [8],[10]   0 [2],[4],[12]   0 [8],[10]                
Cost 0 [2],[4],[12] 0 [8],[10]   0 [2],[4],[12]   0 [8],[10]                
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Preferred Unit                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Cost 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, Class A LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 888,000 [2] 512,000 [10],[13]   888,000 [2]   512,000 [10],[13]                
Cost 481,000 [2] 481,000 [10],[13]   481,000 [2]   481,000 [10],[13]                
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,752,000 [1],[2],[6] 3,075,000 [7],[10],[50]   3,752,000 [1],[2],[6]   3,075,000 [7],[10],[50]                
Cost 3,770,000 [1],[2],[6] 3,094,000 [7],[10],[50]   3,770,000 [1],[2],[6]   3,094,000 [7],[10],[50]                
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,078,000 [1],[2],[6] 3,750,000 [7],[10],[11]   3,078,000 [1],[2],[6]   3,750,000 [7],[10],[11]                
Cost 3,099,000 [1],[2],[6] 3,765,000 [7],[10],[11]   3,099,000 [1],[2],[6]   3,765,000 [7],[10],[11]                
Investment, Identifier [Axis]: Turbo Buyer, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,170,000 [1],[2],[6] 8,061,000 [7],[10],[11]   8,170,000 [1],[2],[6]   8,061,000 [7],[10],[11]                
Cost 8,181,000 [1],[2],[6] 8,187,000 [7],[10],[11]   8,181,000 [1],[2],[6]   8,187,000 [7],[10],[11]                
Investment, Identifier [Axis]: Turnberry Solutions, Inc., Consumer Cyclical, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,899,000 [1],[2],[3] 4,900,000 [7],[10],[14]   4,899,000 [1],[2],[3]   4,900,000 [7],[10],[14]                
Cost 4,892,000 [1],[2],[3] 4,900,000 [7],[10],[14]   4,892,000 [1],[2],[3]   4,900,000 [7],[10],[14]                
Investment, Identifier [Axis]: U.S. Silica Company, Metal & Glass Containers, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[16],[25]   1,439,000       1,439,000                
Cost [7],[16],[25]   1,457,000       1,457,000                
Investment, Identifier [Axis]: UKFast Leaders Limited, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 9,958,000 [1],[2],[15],[30] 9,677,000 [7],[10],[16],[31]   9,958,000 [1],[2],[15],[30]   9,677,000 [7],[10],[16],[31]                
Cost $ 11,452,000 [1],[2],[15],[30] 11,441,000 [7],[10],[16],[31]   $ 11,452,000 [1],[2],[15],[30]   11,441,000 [7],[10],[16],[31]                
Investment, interest rate, paid in kind [1],[2],[15],[30] 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 1                            
Summary of Investment Holdings [Line Items]                            
Fair value $ 15,488,000 [1],[2],[3] 15,390,000 [7],[10],[14]   $ 15,488,000 [1],[2],[3]   15,390,000 [7],[10],[14]                
Cost 16,023,000 [1],[2],[3] 16,045,000 [7],[10],[14]   16,023,000 [1],[2],[3]   16,045,000 [7],[10],[14]                
Investment, Identifier [Axis]: USLS Acquisition, Inc.(f/k/a US Legal Support, Inc.), Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 3,629,000 3,629,000   3,629,000   3,629,000                
Investment, Identifier [Axis]: Union Bidco Limited, Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 80,000 78,000   80,000   78,000                
Investment, Identifier [Axis]: Union Bidco Limited, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 853,000 [1],[2],[15],[30] 847,000 [7],[10],[16],[31]   853,000 [1],[2],[15],[30]   847,000 [7],[10],[16],[31]                
Cost 871,000 [1],[2],[15],[30] 870,000 [7],[10],[16],[31]   871,000 [1],[2],[15],[30]   870,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 672,000 1,170,000   672,000   1,170,000                
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Healthcare, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,686,000 [1],[2],[15],[28] 1,180,000 [7],[10],[16],[29]   1,686,000 [1],[2],[15],[28]   1,180,000 [7],[10],[16],[29]                
Cost 1,698,000 [1],[2],[15],[28] 1,184,000 [7],[10],[16],[29]   1,698,000 [1],[2],[15],[28]   1,184,000 [7],[10],[16],[29]                
Investment, Identifier [Axis]: Unither (Uniholding), Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 471,000 0   471,000   0                
Investment, Identifier [Axis]: Unither (Uniholding), Pharma-ceuticals, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[15],[17] 1,983,000     1,983,000                    
Cost [1],[2],[15],[17] 1,950,000     1,950,000                    
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[15],[17] 1,584,000     1,584,000                    
Cost [1],[2],[15],[17] 1,713,000     1,713,000                    
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 943,000 [1],[2],[6],[15] 1,585,000 [7],[10],[16],[18]   943,000 [1],[2],[6],[15]   1,585,000 [7],[10],[16],[18]                
Cost 970,000 [1],[2],[6],[15] 1,712,000 [7],[10],[16],[18]   970,000 [1],[2],[6],[15]   1,712,000 [7],[10],[16],[18]                
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,476,000 [1],[2],[6],[15] 3,483,000 [7],[10],[11],[16]   2,476,000 [1],[2],[6],[15]   3,483,000 [7],[10],[11],[16]                
Cost 2,497,000 [1],[2],[6],[15] 3,465,000 [7],[10],[11],[16]   2,497,000 [1],[2],[6],[15]   3,465,000 [7],[10],[11],[16]                
Investment, Identifier [Axis]: VOYA CLO 2015-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 73,000 [4],[12],[15] 91,000 [8],[16]   73,000 [4],[12],[15]   91,000 [8],[16]                
Cost 2,583,000 [4],[12],[15] 2,930,000 [8],[16]   2,583,000 [4],[12],[15]   2,930,000 [8],[16]                
Investment, Identifier [Axis]: VOYA CLO 2016-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,085,000 [4],[15] 1,551,000 [8],[16]   1,085,000 [4],[15]   1,551,000 [8],[16]                
Cost 3,242,000 [4],[15] 3,301,000 [8],[16]   3,242,000 [4],[15]   3,301,000 [8],[16]                
Investment, Identifier [Axis]: Validity, Inc., IT Consulting & Other Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,716,000 [1],[2],[26] 4,673,000 [7],[10],[25]   4,716,000 [1],[2],[26]   4,673,000 [7],[10],[25]                
Cost 4,720,000 [1],[2],[26] 4,713,000 [7],[10],[25]   4,720,000 [1],[2],[26]   4,713,000 [7],[10],[25]                
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,000 [2],[4],[12] 2,000 [8],[10],[13]   2,000 [2],[4],[12]   2,000 [8],[10],[13]                
Cost 60,000 [2],[4],[12] 60,000 [8],[10],[13]   60,000 [2],[4],[12]   60,000 [8],[10],[13]                
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Warrants                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,000 [2],[4],[12] 3,000 [8],[10],[13]   3,000 [2],[4],[12]   3,000 [8],[10],[13]                
Cost 72,000 [2],[4],[12] 72,000 [8],[10],[13]   72,000 [2],[4],[12]   72,000 [8],[10],[13]                
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value [15] 3,646,000 [1],[2],[33] 3,238,000 [7],[10],[34]   3,646,000 [1],[2],[33]   3,238,000 [7],[10],[34]                
Cost [15] 4,054,000 [1],[2],[33] 3,640,000 [7],[10],[34]   4,054,000 [1],[2],[33]   3,640,000 [7],[10],[34]                
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value [7],[10],[16],[31]   407,000       407,000                
Cost [7],[10],[16],[31]   411,000       411,000                
Investment, Identifier [Axis]: Vision Solutions Inc., Business Equipment & Services, Second Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,121,000 [1],[4],[6] 4,771,000 [7],[8],[11]   5,121,000 [1],[4],[6]   4,771,000 [7],[8],[11]                
Cost 6,497,000 [1],[4],[6] 6,497,000 [7],[8],[11]   6,497,000 [1],[4],[6]   6,497,000 [7],[8],[11]                
Investment, Identifier [Axis]: VistaJet Pass Through Trust 2021-1B, Airlines, Structured Secured Note - Class B                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,602,000 [2] 3,792,000 [10]   3,602,000 [2]   3,792,000 [10]                
Cost 4,286,000 [2] 4,643,000 [10]   4,286,000 [2]   4,643,000 [10]                
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 7,377,000 [1],[2],[6] 7,645,000 [7],[10],[11]   7,377,000 [1],[2],[6]   7,645,000 [7],[10],[11]                
Cost 7,486,000 [1],[2],[6] 7,520,000 [7],[10],[11]   7,486,000 [1],[2],[6]   7,520,000 [7],[10],[11]                
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, Partnership Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 310,000 [2],[12] 293,000 [10],[13]   310,000 [2],[12]   293,000 [10],[13]                
Cost 164,000 [2],[12] 164,000 [10],[13]   164,000 [2],[12]   164,000 [10],[13]                
Investment, Identifier [Axis]: W2O Holdings, Inc., Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 0 2,622,000   0   2,622,000                
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,769,000 [1],[2],[6] 3,302,000 [7],[10],[11]   5,769,000 [1],[2],[6]   3,302,000 [7],[10],[11]                
Cost 5,934,000 [1],[2],[6] 3,301,000 [7],[10],[11]   5,934,000 [1],[2],[6]   3,301,000 [7],[10],[11]                
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 13,974,000 [1],[2],[3] 13,937,000 [7],[10],[14]   13,974,000 [1],[2],[3]   13,937,000 [7],[10],[14]                
Cost 13,939,000 [1],[2],[3] 13,956,000 [7],[10],[14]   13,939,000 [1],[2],[3]   13,956,000 [7],[10],[14]                
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,066,000 [1],[2],[3] 1,056,000 [7],[10],[14]   1,066,000 [1],[2],[3]   1,056,000 [7],[10],[14]                
Cost 1,062,000 [1],[2],[3] 1,059,000 [7],[10],[14]   1,062,000 [1],[2],[3]   1,059,000 [7],[10],[14]                
Investment, Identifier [Axis]: WWEC Holdings III Corp, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 3,106,000 3,106,000   3,106,000   3,106,000                
Investment, Identifier [Axis]: WWEC Holdings III Corp, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,367,000 1,366,000   1,367,000   1,366,000                
Investment, Identifier [Axis]: Waccamaw River LLC                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,480,000 2,480,000   2,480,000   2,480,000                
Total contributed capital 27,800,000 27,800,000   27,800,000   27,800,000           $ 25,000,000    
Total return of capital (recallable) 5,280,000 5,280,000   5,280,000   5,280,000           5,300,000    
Investment, Identifier [Axis]: Waccamaw River LLC Capital Commitment - Funded                            
Summary of Investment Holdings [Line Items]                            
Total contributed capital                       $ 22,500,000    
Investment, Identifier [Axis]: Waccamaw River LLC, Investment Funds & Vehicles, 20% Member Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 19,021,000 [15] 20,212,000 [16]   19,021,000 [15]   20,212,000 [16]                
Cost 22,520,000 [15] 22,520,000 [16]   22,520,000 [15]   22,520,000 [16]                
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest                            
Summary of Investment Holdings [Line Items]                            
Fair value 19,021,000 20,212,000   19,021,000   20,212,000       $ 13,501,000        
Investment, Identifier [Axis]: Waccamaw River, Joint Venture                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,480,000 2,480,000   2,480,000   2,480,000                
Investment, Identifier [Axis]: Walker Edison Furniture Company LLC, Consumer Goods: Durable, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Cost 3,598,000 [2],[4],[12] 3,598,000 [8],[10],[13]   3,598,000 [2],[4],[12]   3,598,000 [8],[10],[13]                
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity (1.62% Partnership Interest)                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Cost 0 [2],[4],[12] 0 [8],[10],[13]   0 [2],[4],[12]   0 [8],[10],[13]                
Investment, Identifier [Axis]: Wawona Delaware Holdings, LLC, Beverage & Food, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 30,000 [4],[5],[6] 33,000 [8],[11]   30,000 [4],[5],[6]   33,000 [8],[11]                
Cost 41,000 [4],[5],[6] 41,000 [8],[11]   41,000 [4],[5],[6]   41,000 [8],[11]                
Investment, Identifier [Axis]: Wheels Up Experience Inc, Transportation Services, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 12,967,000 [2] 13,153,000 [10]   12,967,000 [2]   13,153,000 [10]                
Cost 12,660,000 [2] 12,973,000 [10]   12,660,000 [2]   12,973,000 [10]                
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] 12,170,000     12,170,000                    
Cost [1],[2],[3] 12,177,000     12,177,000                    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, LP Units                            
Summary of Investment Holdings [Line Items]                            
Fair value [2],[12] 631,000     631,000                    
Cost [2],[12] 631,000     631,000                    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value [1],[2],[3] (75,000)     (75,000)                    
Cost [1],[2],[3] (74,000)     (74,000)                    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,886,000 0   1,886,000   0                
Investment, Identifier [Axis]: Wok Holdings Inc., Retail, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 43,000 [1],[4],[26] 41,000 [7],[8],[11]   43,000 [1],[4],[26]   41,000 [7],[8],[11]                
Cost 48,000 [1],[4],[26] 48,000 [7],[8],[11]   48,000 [1],[4],[26]   48,000 [7],[8],[11]                
Investment, Identifier [Axis]: Woodland Foods, Inc., Line of Credit                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 456,000 456,000   456,000   456,000                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 994,000 [2],[12] 1,012,000 [10],[13]   994,000 [2],[12]   1,012,000 [10],[13]                
Cost 1,663,000 [2],[12] 1,663,000 [10],[13]   1,663,000 [2],[12]   1,663,000 [10],[13]                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 4,880,000 [1],[2],[6] 4,882,000 [7],[10],[11]   4,880,000 [1],[2],[6]   4,882,000 [7],[10],[11]                
Cost 5,340,000 [1],[2],[6] 5,350,000 [7],[10],[11]   5,340,000 [1],[2],[6]   5,350,000 [7],[10],[11]                
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 1,560,000 [1],[2],[6] 1,556,000 [7],[10],[11]   1,560,000 [1],[2],[6]   1,556,000 [7],[10],[11]                
Cost 1,750,000 [1],[2],[6] 1,748,000 [7],[10],[11]   1,750,000 [1],[2],[6]   1,748,000 [7],[10],[11]                
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 1                            
Summary of Investment Holdings [Line Items]                            
Fair value 8,813,000 [1],[2],[26] 8,821,000 [7],[10],[25]   8,813,000 [1],[2],[26]   8,821,000 [7],[10],[25]                
Cost 8,781,000 [1],[2],[26] 8,795,000 [7],[10],[25]   8,781,000 [1],[2],[26]   8,795,000 [7],[10],[25]                
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 2                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,428,000 [1],[2],[26] 2,428,000 [7],[10],[25]   2,428,000 [1],[2],[26]   2,428,000 [7],[10],[25]                
Cost 2,420,000 [1],[2],[26] 2,423,000 [7],[10],[25]   2,420,000 [1],[2],[26]   2,423,000 [7],[10],[25]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, CAF Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 3,196,000 3,109,000   3,196,000   3,109,000                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Common Stock                            
Summary of Investment Holdings [Line Items]                            
Fair value 565,000 [2],[12],[15] 549,000 [10],[13],[16]   565,000 [2],[12],[15]   549,000 [10],[13],[16]                
Cost 565,000 [2],[12],[15] 565,000 [10],[13],[16]   565,000 [2],[12],[15]   565,000 [10],[13],[16]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,619,000 [1],[2],[15],[30] 5,446,000 [7],[10],[16],[31]   5,619,000 [1],[2],[15],[30]   5,446,000 [7],[10],[16],[31]                
Cost 5,620,000 [1],[2],[15],[30] 5,586,000 [7],[10],[16],[31]   5,620,000 [1],[2],[15],[30]   5,586,000 [7],[10],[16],[31]                
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Subordinated Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 2,891,000 [2],[15] 2,502,000 [10],[16]   2,891,000 [2],[15]   2,502,000 [10],[16]                
Cost $ 2,873,000 [2],[15] $ 2,553,000 [10],[16]   $ 2,873,000 [2],[15]   $ 2,553,000 [10],[16]                
Investment, interest rate, paid in kind 11.00% [2],[15] 11.00% [10],[16]   11.00% [2],[15]   11.00% [10],[16]                
Investment, Identifier [Axis]: ZB Holdco LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount $ 0 $ 1,352,000   $ 0   $ 1,352,000                
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,980,000 [1],[2],[6] 2,628,000 [7],[10],[11]   3,980,000 [1],[2],[6]   2,628,000 [7],[10],[11]                
Cost 3,974,000 [1],[2],[6] 2,623,000 [7],[10],[11]   3,974,000 [1],[2],[6]   2,623,000 [7],[10],[11]                
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, LLC Units                            
Summary of Investment Holdings [Line Items]                            
Fair value 198,000 [2],[12] 189,000 [10],[13]   198,000 [2],[12]   189,000 [10],[13]                
Cost 153,000 [2],[12] 153,000 [10],[13]   153,000 [2],[12]   153,000 [10],[13]                
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value (11,000) [1],[2],[6] (12,000) [7],[10],[11]   (11,000) [1],[2],[6]   (12,000) [7],[10],[11]                
Cost (14,000) [1],[2],[6] (14,000) [7],[10],[11]   (14,000) [1],[2],[6]   (14,000) [7],[10],[11]                
Investment, Identifier [Axis]: ZB Holdco LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 845,000 845,000   845,000   845,000                
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Capex / Acquisition Facility                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 2,587,000 2,516,000   2,587,000   2,516,000                
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Services: Business, First Lien Senior Secured Term Loan                            
Summary of Investment Holdings [Line Items]                            
Fair value 5,614,000 [1],[2],[15],[39] 5,162,000 [7],[10],[16],[40]   5,614,000 [1],[2],[15],[39]   5,162,000 [7],[10],[16],[40]                
Cost 6,160,000 [1],[2],[15],[39] 6,149,000 [7],[10],[16],[40]   6,160,000 [1],[2],[15],[39]   6,149,000 [7],[10],[16],[40]                
Investment, Identifier [Axis]: eShipping, LLC, Delayed Draw Term Loan                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 1,650,000 1,650,000   1,650,000   1,650,000                
Investment, Identifier [Axis]: eShipping, LLC, Revolver                            
Summary of Investment Holdings [Line Items]                            
Committed investment amount 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                            
Summary of Investment Holdings [Line Items]                            
Fair value 3,151,000 [1],[2],[26] 3,262,000 [7],[10],[25]   3,151,000 [1],[2],[26]   3,262,000 [7],[10],[25]                
Cost 3,066,000 [1],[2],[26] 3,209,000 [7],[10],[25]   3,066,000 [1],[2],[26]   3,209,000 [7],[10],[25]                
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, Revolver                            
Summary of Investment Holdings [Line Items]                            
Fair value 0 [1],[2],[26] (9,000) [7],[10],[25]   0 [1],[2],[26]   (9,000) [7],[10],[25]                
Cost $ (23,000) [1],[2],[26] $ (24,000) [7],[10],[25]   $ (23,000) [1],[2],[26]   $ (24,000) [7],[10],[25]                
[1] Debt investment includes interest rate floor feature.
[2] The fair value of the investment was determined using significant unobservable inputs.
[3] The interest rate on these loans is subject to 3 Month SOFR, which as of March 31, 2023 was 4.90855%.
[4] 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.
[5] Non-accrual investment.
[6] The interest rate on these loans is subject to 3 Month LIBOR, which as of March 31, 2023 was 5.19271%.
[7] Debt investment includes interest rate floor feature.
[8] 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.
[9] Non-accrual investment.
[10] The fair value of the investment was determined using significant unobservable inputs.
[11] The interest rate on these loans is subject to 3 Month LIBOR, which as of December 31, 2022 was 4.76729%.
[12] Investment is non-income producing.
[13] Investment is non-income producing.
[14] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2022 was 4.58745%.
[15] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 26.4% of total investments at fair value as of March 31, 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).
[16] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 25.9% of total investments at fair value as of 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).
[17] The interest rate on these loans is subject to 3 Month EURIBOR, which as of March 31, 2023 was 3.03800%.
[18] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2022 was 2.13200%.
[19] The interest rate on these loans is subject to 1 Month BBSY, which as of March 31, 2023 was 3.63340%.
[20] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2022 was 3.01500%.
[21] The interest rate on these loans is subject to 1 Month SOFR, which as of March 31, 2023 was 4.80247%.
[22] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2022 was 4.35806%.
[23] The interest rate on these loans is subject to 6 Month SOFR, which as of March 31, 2023 was 4.89968%.
[24] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2022 was 4.78131%.
[25] The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.
[26] The interest rate on these loans is subject to 1 Month LIBOR, which as of March 31, 2023 was 4.85771%.
[27] The interest rate on these loans is subject to 6 Month LIBOR, which as of March 31, 2023 was 5.31300%.
[28] The interest rate on these loans is subject to 6 Month EURIBOR, which as of March 31, 2023 was 3.34100%.
[29] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2022 was 2.69300%.
[30] The interest rate on these loans is subject to 3 Month SONIA, which as of March 31, 2023 was 4.29870%.
[31] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2022 was 3.75470%.
[32] The interest rate on these loans is subject to 1 Month EURIBOR, which as of March 31, 2023 was 2.91500%.
[33] The interest rate on these loans is subject to 6 Month SONIA, which as of March 31, 2023 was 4.46810%.
[34] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2022 was 4.09490%.
[35] The interest rate on these loans is subject to 6 Month BBSY, which as of March 31, 2023 was 3.78750%.
[36] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2022 was 3.76500%.
[37] The interest rate on these loans is subject to 3 Month STIBOR, which as of March 31, 2023 was 3.36400%.
[38] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2022 was 2.70100%.
[39] The interest rate on these loans is subject to 1 Month SONIA, which as of March 31, 2023 was 4.16870%.
[40] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2022 was 3.43570%.
[41] The interest rate on these loans is subject to 3 Month CDOR, which as of March 31, 2023 was 5.02750%.
[42] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2022 was 4.93500%.
[43] 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.
[44] 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.
[45] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2022 was 3.26470%.
[46] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2022 was 1.88400%.
[47] The interest rate on these loans is subject to 3 Month BBSY, which as of March 31, 2023 was 3.71500%.
[48] The interest rate on these loans is subject to 3 Month BKBM, which as of March 31, 2023 was 5.15000%.
[49] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2022 was 4.53000%.
[50] The interest rate on these loans is subject to 6 Month LIBOR, which as of December 31, 2022 was 5.13886%.
[51] The interest rate on these loans is subject to 12 Month EURIBOR, which as of March 31, 2023 was 3.62200%.
[52] All debt investments are income producing, unless otherwise noted. The Company’s external investment adviser, Barings, determines in good faith the fair value of the Company’s investments in accordance with a valuation policy and processes established by the Adviser, which have been approved by the Company’s board of directors (the “Board”), and the Investment Company Act of 1940, as amended (the “1940 Act”). In addition, all debt investments are variable rate investments unless otherwise noted. Index-based floating interest rates are generally subject to a contractual minimum interest rate. Variable rate loans to the Company’s portfolio companies bear interest at a rate that may be determined by reference to the London Interbank Offered Rate (“LIBOR”), the Secured Overnight Financing Rate (“SOFR”), the Euro Interbank Offered Rate (“EURIBOR”), the Bank Bill Swap Bid Rate (“BBSY”), the Stockholm Interbank Offered Rate (“STIBOR”), the Canadian Dollar Offered Rate (“CDOR”), the Sterling Overnight Index Average (“SONIA”), the Swiss Average Rate Overnight (“SARON”), the Norwegian Interbank Offered Rate (“NIBOR”), the Bank Bill Market rate (“BKBM”) or an alternate base rate (commonly based on the Federal Funds Rate or the Prime Rate), at the borrower’s option, which reset annually, semi-annually, quarterly or monthly. For each such loan, the Company has provided the interest rate in effect on the date presented. SOFR based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread. The borrower may also elect to have multiple interest reset periods for each loan.
[53] All of the Company’s portfolio company investments (including joint venture investments), which as of March 31, 2023 represented 212.1% of the Company’s net assets, are subject to legal restrictions on sales. The acquisition date represents the date of the Company's initial investment in the relevant portfolio company.
[54] The interest rate on these loans is subject to Prime, which as of March 31, 2023 was 8.00000%.
[55] The interest rate on these loans is subject to Prime, which as of December 31, 2022 was 7.50000%.
[56] The interest rate on these loans is subject to 1 Month NIBOR, which as of March 31, 2023 was 3.38000%.
[57] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2022 was 3.04000%.
[58] The interest rate on these loans is subject to 6 Month SARON, which as of March 31, 2023 was 1.41862%.
[59] The interest rate on these loans is subject to 3 Month SARON, which as of December 31, 2022 was 0.94212%.
[60] The interest rate on these loans is subject to 1 Month CDOR, which as of March 31, 2023 was 4.95000%.
[61] The interest rate on these loans is subject to 1 Month CDOR, which as of December 31, 2022 was 4.73750%.