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Unaudited Consolidated Schedule of Investments - Schedule Of Investments (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 2,448,935    
Fair value at ending balance $ 2,488,715 [1] $ 2,448,935  
Investment, interest rate, paid in kind [2],[3],[4],[5] 3.30%    
Jocassee Partners LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ownership percent 9.10% [4],[6],[7],[8] 9.10% [9],[10],[11]  
Sierra Senior Loan Strategy JV I, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ownership percent 89.01% [4],[6],[7],[12] 89.01% [9],[10],[11],[13]  
Thompson Rivers LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ownership percent 16.00% [6],[7],[14] 16.00% [9],[10],[11]  
Waccamaw River, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Ownership percent 20.00% [4],[6],[7],[14],[15] 20.00%  
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[16],[17],[18],[19] $ 0    
Fair value at ending balance [13],[16],[17],[18],[19]   $ 0  
Interest [13],[16],[17],[18],[19]   5.00%  
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[16],[17],[18],[19] 1,263    
Fair value at ending balance [13],[16],[17],[18],[19]   $ 1,263  
Interest   5.00%  
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Energy: Oil & Gas, Warrants      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] 0    
Fair value at ending balance [13],[19],[20]   $ 0  
Investment owned, balance (in shares) [9],[10],[13],[19],[20]   7,546.76  
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 [21] $ 0  
Gross Additions 41 [21],[22] 419  
Gross Reductions (41) [21],[23] 0  
Amount of Realized Gain (Loss) (418) [21] 0  
Amount of Unrealized Gain (Loss) 418 [21] (419)  
Fair value at ending balance [21] 0 0  
Amount of Interest or Dividends Credited to Income $ 67 [21],[24] $ 0  
Interest 5.00% 5.00%  
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 1,263 [21] $ 0  
Gross Additions 14 [21],[22] 1,498  
Gross Reductions (1,156) [21],[23] 0  
Amount of Realized Gain (Loss) (357) [21] 0  
Amount of Unrealized Gain (Loss) 236 [21] (235)  
Fair value at ending balance [21] 0 1,263  
Amount of Interest or Dividends Credited to Income $ 127 [21],[24] $ (12)  
Interest 5.00% 5.00%  
Investment, Identifier [Axis]: 1888 Industrial Services, LLC, Warrants      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 0 [21] $ 0  
Gross Additions 0 [21],[22] 0  
Gross Reductions 0 [21],[23] 0  
Amount of Realized Gain (Loss) 0 [21] 0  
Amount of Unrealized Gain (Loss) 0 [21] 0  
Fair value at ending balance [21] 0 0  
Amount of Interest or Dividends Credited to Income $ 0 [21],[24] $ 0  
Investment owned, balance (in shares) 7,546.76 7,546.76  
Investment, Identifier [Axis]: 1WorldSync, Inc., IT Consulting & Other Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 16,307    
Fair value at ending balance $ 7,124 [3],[5],[26] $ 16,307 [18],[19],[25]  
Interest 5.00% [3],[5],[26] 4.75% [18],[19],[25]  
Interest 10.40% [3],[5],[26] 8.80% [18],[19],[25]  
Investment, Identifier [Axis]: A.T. Holdings II LTD, Other Financial, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 12,500    
Fair value at ending balance $ 11,688 [4],[5] $ 12,500 [11],[19]  
Interest 14.30% [4],[5] 14.30% [11],[19]  
Investment, Identifier [Axis]: ADB Safegate, Aerospace & Defense, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 4,180    
Fair value at ending balance $ 5,392 [2],[3],[4],[5] $ 4,180 [11],[17],[18],[19]  
Interest 9.25% [2],[3],[4],[5] 9.25% [11],[17],[18],[19]  
Interest 14.60% [2],[3],[4],[5] 14.00% [11],[17],[18],[19]  
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 798    
Fair value at ending balance $ 537 [5],[14] $ 798 [19],[20]  
Investment owned, balance (in shares) 348.68 [5],[6],[7],[14],[15] 348.68 [9],[10],[19],[20]  
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 6,215    
Fair value at ending balance $ 6,402 [3],[5],[27] $ 6,215 [17],[18],[19]  
Interest 7.50% [3],[5],[27] 7.50% [17],[18],[19]  
Interest 13.00% [3],[5],[27] 12.20% [17],[18],[19]  
Investment, Identifier [Axis]: AMMC CLO 22, Limited Series 2018-22A, Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] $ 3,190    
Fair value at ending balance [11],[13]   $ 3,190  
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] 1,423    
Fair value at ending balance [11],[13]   1,423  
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[12] 2,468    
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[12] 1,476    
Investment, Identifier [Axis]: APC1 Holding, Diversified Manufacturing, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] 2,044    
Fair value at ending balance $ 2,505 [3],[4],[5],[29] $ 2,044 [11],[18],[19],[28]  
Interest 5.50% [3],[4],[5],[29] 6.00% [11],[18],[19],[28]  
Interest 9.40% [3],[4],[5],[29] 8.20% [11],[18],[19],[28]  
Investment, Identifier [Axis]: APOG Bidco Pty Ltd, Healthcare, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[30] $ 2,073    
Fair value at ending balance $ 2,086 [3],[4],[5],[31] $ 2,073 [11],[18],[19],[30]  
Interest 7.25% [3],[4],[5],[31] 7.25% [11],[18],[19],[30]  
Interest 11.60% [3],[4],[5],[31] 10.30% [11],[18],[19],[30]  
Investment, Identifier [Axis]: AQA Acquisition Holding, Inc., High Tech Industries, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 19,140    
Fair value at ending balance $ 19,938 [2],[3],[5] $ 19,140 [17],[18],[19]  
Interest 7.50% [2],[3],[5] 7.50% [17],[18],[19]  
Interest 13.00% [2],[3],[5] 12.20% [17],[18],[19]  
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Class A Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 620    
Fair value at ending balance $ 703 [5] $ 620 [19],[20]  
Investment owned, balance (in shares) 25,718.2 [5],[6],[7] 25,718.2 [9],[10],[19],[20]  
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 20,920    
Fair value at ending balance $ 9,035 [3],[5],[27] $ 20,920  
Interest 4.75% [3],[5],[27] 5.00%  
Interest 10.10% [3],[5],[27] 9.30%  
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ (9)    
Interest [3],[5],[8],[27] 4.75%    
Interest [3],[5],[8],[27] 10.10%    
Investment, Identifier [Axis]: ASPEQ Heating Group LLC, Building Products, Air & Heating, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 8,367    
Fair value at ending balance [17],[18],[19]   $ 8,367  
Interest [17],[18],[19]   4.25%  
Interest [17],[18],[19]   9.00%  
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[32] 8,125    
Fair value at ending balance $ 8,250 [2],[3],[5] $ 8,125 [18],[19],[32]  
Interest 5.50% [2],[3],[5] 6.00% [18],[19],[32]  
Interest 10.90% [2],[3],[5] 10.40% [18],[19],[32]  
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[32] $ (42)    
Fair value at ending balance $ 0 [2],[3],[5],[8] $ (42) [18],[19],[32]  
Interest 5.50% [2],[3],[5],[8] 6.00% [18],[19],[32]  
Interest 10.90% [2],[3],[5],[8] 10.40% [18],[19],[32]  
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[33] $ 4,416    
Fair value at ending balance [18],[33]   $ 4,416  
Interest [18],[33]   3.25%  
Interest [18],[33]   7.70%  
Investment, interest rate, paid in kind [18],[33]   0.30%  
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[33] 685    
Fair value at ending balance [18],[33]   $ 685  
Interest [18],[33]   4.50%  
Interest [18],[33]   8.70%  
Investment, interest rate, paid in kind [18],[33]   1.00%  
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 5,919    
Fair value at ending balance $ 6,332 $ 5,919  
Interest 5.00% 5.00%  
Investment, interest rate, paid in kind 10.00% 10.00%  
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class A Convertible Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 5,403    
Fair value at ending balance $ 5,858 [5],[14] $ 5,403 [19],[20]  
Investment owned, balance (in shares) 5,000 [5],[6],[7],[14],[15] 5,000 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class A Convertible Preferred Equity1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 1,667    
Fair value at ending balance [19],[20]   $ 1,667  
Investment owned, balance (in shares) [9],[10],[19],[20]   1,667  
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class B Convertible Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 1,950    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 1,651    
Investment, Identifier [Axis]: Accelerate Learning, Inc., Education Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 7,480    
Fair value at ending balance [17],[18],[19]   $ 7,480  
Interest [17],[18],[19]   4.50%  
Interest [17],[18],[19]   8.90%  
Investment, Identifier [Axis]: Acclime Holdings HK Limited, Business services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[34] 2,436    
Fair value at ending balance $ 2,461 [3],[4],[5],[26] $ 2,436 [11],[18],[19],[34]  
Interest 6.25% [3],[4],[5],[26] 6.50% [11],[18],[19],[34]  
Interest 11.60% [3],[4],[5],[26] 9.60% [11],[18],[19],[34]  
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 436    
Fair value at ending balance $ 512 [5],[14] $ 436 [19],[20]  
Investment owned, balance (in shares) 437,623.3 [5],[6],[7],[14],[15] 437,623.3 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 12,069    
Fair value at ending balance $ 11,768 [2],[3],[5] $ 12,069 [17],[18],[19]  
Interest 5.25% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 10.80% [2],[3],[5] 10.80% [17],[18],[19]  
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 1,116    
Fair value at ending balance $ 1,602 [2],[3],[5],[8] $ 1,116 [17],[18],[19]  
Interest 5.25% [2],[3],[5],[8] 5.75% [17],[18],[19]  
Interest 10.80% [2],[3],[5],[8] 10.80% [17],[18],[19]  
Investment, Identifier [Axis]: Acogroup, Business Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 7,276    
Fair value at ending balance $ 7,226 [3],[4],[5],[29] $ 7,276 [11],[18],[19],[35]  
Interest 4.65% [3],[4],[5],[29] 6.25% [11],[18],[19],[35]  
Interest 8.60% [3],[4],[5],[29] 6.80% [11],[18],[19],[35]  
Investment, interest rate, paid in kind [3],[4],[5],[29] 2.30%    
Investment, Identifier [Axis]: Adhefin International, Industrial Other, First Lien Senior Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[29] $ 1,778    
Interest [3],[4],[5],[8],[29] 6.50%    
Interest [3],[4],[5],[8],[29] 10.40%    
Investment, Identifier [Axis]: Adhefin International, Industrial Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[29] $ 300    
Interest [3],[4],[5],[29] 10.50%    
Investment, interest rate, paid in kind [3],[4],[5],[29] 14.40%    
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A1 Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 671    
Fair value at ending balance $ 697 [5],[14] $ 671 [19],[20]  
Investment owned, balance (in shares) 8,717.76 [5],[6],[7],[14] 8,717.76 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A2 Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 173    
Fair value at ending balance $ 180 [5],[14] $ 173 [19],[20]  
Investment owned, balance (in shares) 2,248.46 [5],[6],[7],[14] 2,248.46 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B1 Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 0    
Fair value at ending balance $ 0 [5],[14] $ 0 [19],[20]  
Investment owned, balance (in shares) 8,717.76 [5],[6],[7],[14] 8,717.76 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class B2 Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 0    
Fair value at ending balance $ 0 [5],[14] $ 0 [19],[20]  
Investment owned, balance (in shares) 2,248.46 [5],[6],[7],[14] 2,248.46 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Air Canada 2020-2 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 4,816    
Fair value at ending balance $ 3,587 $ 4,816  
Interest 9.00% 9.00%  
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 12,722    
Fair value at ending balance $ 7,633 [2],[3],[5] $ 12,722 [17],[18],[19]  
Interest 5.00% [2],[3],[5] 5.50% [17],[18],[19]  
Interest 10.30% [2],[3],[5] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan, 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 1,296    
Interest 6.25%    
Interest 11.70%    
Investment, Identifier [Axis]: AirX Climate Solutions, Inc,Diversified Manufacturing, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 3,226    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.70%    
Investment, Identifier [Axis]: AirX Climate Solutions, Inc,Diversified Manufacturing,Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (12)    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.70%    
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, Insurance, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[29] $ 3,443    
Interest [3],[4],[5],[8],[29] 6.25%    
Interest [3],[4],[5],[8],[29] 10.20%    
Investment, Identifier [Axis]: Alpine SG, LLC, High Tech Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[19],[36] $ 22,677    
Fair value at ending balance $ 22,792 [2],[3],[5],[12] $ 22,677 [13],[18],[19],[36]  
Interest 6.00% [2],[3],[5],[12] 6.00% [13],[18],[19],[36]  
Interest 11.50% [2],[3],[5],[12] 10.40% [13],[18],[19],[36]  
Investment, Identifier [Axis]: Alpine US Bidco LLC, Agricultural Products, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[33] $ 16,704    
Fair value at ending balance [18],[33]   $ 16,704  
Interest [18],[33]   9.00%  
Interest [18],[33]   13.30%  
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Class B Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] 1,121    
Fair value at ending balance $ 1,188 [4],[5],[14] $ 1,121 [11],[19],[20]  
Investment owned, balance (in shares) 93,165,208 [4],[5],[6],[7],[14],[15] 93,165,208 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Subordinated Loan Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[19] $ 4,303    
Fair value at ending balance $ 4,824 [4],[5] $ 4,303 [11],[17],[19]  
Interest 2.00% [4],[5] 2.00%  
Interest [11],[17],[19]   6.80%  
Investment, interest rate, paid in kind 9.00% [4],[5] 9.00% [11],[17],[19]  
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrant      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 426    
Fair value at ending balance $ 529 [4],[5],[14] $ 426 [11],[19],[20]  
Investment owned, balance (in shares) 380,385 [4],[5],[6],[7],[14],[15] 380,385 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 89    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 88,110    
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[27] $ 1,920    
Interest [3],[5],[27] 5.50%    
Interest [3],[5],[27] 10.90%    
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ (4)    
Interest [3],[5],[8],[27] 5.50%    
Interest [3],[5],[8],[27] 10.90%    
Investment, Identifier [Axis]: Amtech LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 2,222    
Fair value at ending balance $ 2,988 [2],[3],[5] $ 2,222 [18],[19],[33]  
Interest 5.50% [2],[3],[5] 5.50% [18],[19],[33]  
Interest 11.40% [2],[3],[5] 9.60% [18],[19],[33]  
Investment, Identifier [Axis]: Amtech LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 128    
Fair value at ending balance $ 242 [2],[3],[5],[8] $ 128 [18],[19],[33]  
Interest 5.50% [2],[3],[5],[8] 5.50% [18],[19],[33]  
Interest 11.40% [2],[3],[5],[8] 9.60% [18],[19],[33]  
Investment, Identifier [Axis]: Anagram Holdings, LLC, Chemicals, Plastics, & Rubber, First Lien Senior Secured Note      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 14,368    
Fair value at ending balance   $ 14,368  
Interest   10.00%  
Investment, interest rate, paid in kind   5.00%  
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] 2,330    
Fair value at ending balance $ 3,173 [3],[4],[5],[29] $ 2,330 [11],[18],[19],[28]  
Interest 6.25% [3],[4],[5],[29] 7.70% [11],[18],[19],[28]  
Interest 10.20% [3],[4],[5],[29] 6.00% [11],[18],[19],[28]  
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 723    
Fair value at ending balance $ 958 [3],[4],[5],[29] $ 723 [11],[18],[19],[28]  
Interest 6.25% [3],[4],[5],[29] 6.00% [11],[18],[19],[28]  
Interest 10.20% [3],[4],[5],[29] 7.70% [11],[18],[19],[28]  
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 5,623    
Fair value at ending balance $ 1,678 [3],[4],[5],[29] $ 5,623 [11],[18],[19],[28]  
Interest 7.00% [3],[4],[5],[29] 6.00% [11],[18],[19],[28]  
Interest 11.00% [3],[4],[5],[29] 7.70% [11],[18],[19],[28]  
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 997    
Fair value at ending balance $ 1,002 [2],[3],[4],[5] $ 997 [11],[17],[18],[19]  
Interest 6.25% [2],[3],[4],[5] 6.00% [11],[17],[18],[19]  
Interest 11.90% [2],[3],[4],[5] 10.80% [11],[17],[18],[19]  
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ (8)    
Fair value at ending balance [11],[18],[19],[28]   $ (8)  
Interest [11],[18],[19],[28]   6.00%  
Interest [11],[18],[19],[28]   7.70%  
Investment, Identifier [Axis]: Anju Software, Inc. Application Software, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[37] $ 9,404    
Investment, interest rate, paid in kind [3],[5],[37] 8.00%    
Investment, Identifier [Axis]: Anju Software, Inc. Application Software, Super Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8] $ 817    
Investment, interest rate, paid in kind [3],[5],[8] 10.00%    
Investment, Identifier [Axis]: Anju Software, Inc., Application Software, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 11,006    
Fair value at ending balance [18],[19],[33]   $ 11,006  
Interest [18],[19],[33]   7.25%  
Interest [18],[19],[33]   11.60%  
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] 1,753    
Fair value at ending balance $ 1,858 [3],[4],[5],[39] $ 1,753 [11],[18],[19],[38]  
Interest 5.75% [3],[4],[5],[39] 6.25% [11],[18],[19],[38]  
Interest 11.10% [3],[4],[5],[39] 9.70% [11],[18],[19],[38]  
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[39] $ 1,358    
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Interest [4],[39] 6.50%    
Interest [4],[39] 11.70%    
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, Subordinated Senior Unsecured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 266    
Fair value at ending balance $ 285 [4],[5] $ 266 [11],[19]  
Investment, interest rate, paid in kind 8.00% [4],[5] 8.00% [11],[19]  
Investment, Identifier [Axis]: Apidos CLO XXIV, Series 2016-24A, Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] $ 6,635    
Fair value at ending balance 5,885 [4],[12] $ 6,635 [11],[13]  
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] 6    
Fair value at ending balance $ 0 [4],[5],[14] $ 6 [11],[19],[20]  
Investment owned, balance (in shares) 48 [4],[5],[14] 48 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[40] $ 5,085    
Fair value at ending balance $ 1,982 [3],[4],[5],[41] $ 5,085 [11],[18],[19],[40]  
Interest 6.50% [3],[4],[5],[41] 7.00% [11],[18],[19],[40]  
Interest 10.40% [3],[4],[5],[41] 8.90% [11],[18],[19],[40]  
Investment, interest rate, paid in kind [3],[4],[5],[41] 1.50%    
Investment, Identifier [Axis]: Aptus 1829. GmbH, Chemicals, Plastics, and Rubber, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 110    
Fair value at ending balance $ 4 [4],[5],[14] $ 110 [11],[19],[20]  
Investment owned, balance (in shares) 13 [4],[5],[14] 13 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Apus Bidco Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] $ 3,344    
Fair value at ending balance $ 3,621 [3],[4],[5],[39] $ 3,344 [11],[18],[19],[42]  
Interest 5.50% [3],[4],[5],[39] 5.50% [11],[18],[19],[42]  
Interest 10.70% [3],[4],[5],[39] 7.20% [11],[18],[19],[42]  
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] $ 5,263    
Fair value at ending balance $ 5,839 [3],[4],[5],[8],[43] $ 5,263 [11],[18],[19],[42]  
Interest 6.00% [3],[4],[5],[8],[43] 6.00% [11],[18],[19],[42]  
Interest 11.20% [3],[4],[5],[8],[43] 8.90% [11],[18],[19],[42]  
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] $ 198    
Fair value at ending balance [11],[18],[19],[42]   $ 198  
Interest [11],[18],[19],[42]   6.00%  
Interest [11],[18],[19],[42]   8.90%  
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Transportation Services, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] 1,475    
Fair value at ending balance $ 1,706 [3],[4],[5],[43] $ 1,475 [11],[18],[19],[42]  
Interest 10.50% [3],[4],[5],[43] 10.50% [11],[18],[19],[42]  
Investment, interest rate, paid in kind [3],[4],[5],[43] 15.70%    
Investment, Identifier [Axis]: Arc Education, Consumer Cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 2,969    
Fair value at ending balance $ 3,791 [3],[4],[5],[8],[29] $ 2,969 [11],[18],[19],[28]  
Interest 5.75% [3],[4],[5],[8],[29] 5.75% [11],[18],[19],[28]  
Interest 9.70% [3],[4],[5],[8],[29] 8.00% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Arch Global Precision LLC, Industrial Machinery, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 9,094    
Fair value at ending balance $ 8,993 [2],[3],[5] $ 9,094 [17],[18],[19]  
Interest 4.75% [2],[3],[5] 4.75% [17],[18],[19]  
Interest 10.20% [2],[3],[5] 9.20% [17],[18],[19]  
Investment, Identifier [Axis]: Archimede, Consumer Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 6,164    
Fair value at ending balance $ 6,304 [3],[4],[5],[29] $ 6,164 [11],[18],[19],[28]  
Interest 6.50% [3],[4],[5],[29] 5.75% [11],[18],[19],[28]  
Interest 10.40% [3],[4],[5],[29] 7.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 0    
Fair value at ending balance $ 0 [4],[5],[14] $ 0 [11],[19],[20]  
Investment owned, balance (in shares) 464 [4],[5],[6],[7],[14],[15] 464 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Equity Loan Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 50    
Fair value at ending balance $ 42 [4],[5] $ 50 [11],[19]  
Investment, interest rate, paid in kind 10.00% [4],[5] 10.00% [11],[19]  
Investment owned, balance (in shares) 41,560 [4],[5],[6],[7],[15] 41,560 [9],[10],[11],[19]  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] $ 126    
Fair value at ending balance $ 125 [2],[3],[4],[5] $ 126 [11],[18],[19],[25]  
Interest 4.00% [2],[3],[4],[5] 5.75% [11],[18],[19],[25]  
Interest 9.30% [2],[3],[4],[5] 10.30% [11],[18],[19],[25]  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 1,536    
Fair value at ending balance $ 307 [3],[4],[5],[29] $ 1,536 [11],[18],[19],[38]  
Interest 4.00% [3],[4],[5],[29] 5.75% [11],[18],[19],[38]  
Interest 7.60% [3],[4],[5],[29] 9.20% [11],[18],[19],[38]  
Investment, interest rate, paid in kind [3],[4],[5],[29] 3.30%    
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 1,547    
Fair value at ending balance $ 1,408 [3],[4],[5],[29] $ 1,547 [11],[18],[19],[28]  
Interest 6.75% [3],[4],[5],[29] 5.75% [11],[18],[19],[28]  
Interest 10.70% [3],[4],[5],[29] 8.00% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[39] $ 1,632    
Interest [3],[4],[5],[39] 4.00%    
Interest [3],[4],[5],[39] 8.90%    
Investment, interest rate, paid in kind [3],[4],[5],[39] 3.30%    
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 5      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[39] $ (28)    
Interest [3],[4],[5],[8],[39] 6.50%    
Interest [3],[4],[5],[8],[39] 11.40%    
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 50    
Fair value at ending balance $ 42 [4],[5] $ 50 [11],[19]  
Investment, interest rate, paid in kind 10.00% [4],[5] 10.00% [11],[19]  
Investment owned, balance (in shares) 41,560 [4],[5],[6],[7],[15] 41,560 [9],[10],[11],[19]  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Second Lien Term Loan Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5] $ 734    
Investment, interest rate, paid in kind [4],[5] 10.50%    
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 487    
Fair value at ending balance [11],[19]   $ 487  
Investment, interest rate, paid in kind [11],[19]   10.50%  
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 3,896    
Fair value at ending balance $ 3,790 [2],[3],[5] $ 3,896 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 10.90% [2],[3],[5] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[32] $ 4,932    
Fair value at ending balance $ 4,709 [2],[3],[5] $ 4,932 [18],[19],[32]  
Interest 5.50% [3],[5] 5.50% [18],[19],[32]  
Interest 10.90% [3],[5] 9.70% [18],[19],[32]  
Investment, Identifier [Axis]: Astra Bidco Limited, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 1,886    
Fair value at ending balance $ 2,380 [3],[4],[5],[8],[39] $ 1,886 [11],[18],[19],[38]  
Interest 5.25% [3],[4],[5],[8],[39] 5.00% [11],[18],[19],[38]  
Interest 10.40% [3],[4],[5],[8],[39] 9.40% [11],[18],[19],[38]  
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 1,305    
Fair value at ending balance $ 1,427 [3],[4],[5],[41] $ 1,305 [11],[18],[19],[35]  
Interest 7.25% [3],[4],[5],[41] 6.25% [11],[18],[19],[35]  
Interest 11.30% [3],[4],[5],[41] 8.10% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 704    
Fair value at ending balance $ 788 [3],[4],[5],[43] $ 704 [11],[18],[19],[38]  
Interest 7.25% [3],[4],[5],[43] 7.25% [11],[18],[19],[38]  
Interest 12.40% [3],[4],[5],[43] 10.70% [11],[18],[19],[38]  
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[44] $ 2,298    
Fair value at ending balance $ 2,190 [3],[4],[5],[8],[45] $ 2,298 [11],[18],[19],[44]  
Interest 5.00% [3],[4],[5],[8],[45] 4.50% [11],[18],[19],[44]  
Interest 9.40% [3],[4],[5],[8],[45] 7.70% [11],[18],[19],[44]  
Investment, Identifier [Axis]: Aviation Technical Services, Inc., Aerospace & Defense, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[19],[33] $ 27,794    
Fair value at ending balance $ 29,162 [3],[5],[12],[27] $ 27,794 [13],[18],[19],[33]  
Interest 8.50% [3],[5],[12],[27] 2.00% [13],[18],[19],[33]  
Interest 14.00% [3],[5],[12],[27] 6.40% [13],[18],[19],[33]  
Investment, interest rate, paid in kind [13],[18],[19],[33]   6.50%  
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 183    
Fair value at ending balance $ 288 [5] $ 183 [19],[20]  
Investment owned, balance (in shares) 192,307.7 [5],[6],[7],[15] 192,307.7 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 4,489    
Fair value at ending balance $ 4,809 [2],[3],[5],[8] $ 4,489 [17],[18],[19]  
Interest 5.25% [2],[3],[5],[8] 5.25% [17],[18],[19]  
Interest 10.70% [2],[3],[5],[8] 10.00% [17],[18],[19]  
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (6)    
Fair value at ending balance $ (3) [2],[3],[5],[8] $ (6) [17],[18],[19]  
Interest 5.25% [2],[3],[5],[8] 5.25% [17],[18],[19]  
Interest 10.70% [2],[3],[5],[8] 10.00% [17],[18],[19]  
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 1,403    
Fair value at ending balance $ 1,529 [5] $ 1,403 [19]  
Investment, interest rate, paid in kind 12.00% [5] 12.00% [19]  
Investment, Identifier [Axis]: BPG Holdings IV Corp, Capital Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 13,401    
Interest [2],[3],[5] 6.00%    
Interest [2],[3],[5] 11.40%    
Investment, Identifier [Axis]: BVI Medical, Inc., Healthcare, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[28] $ 9,495    
Fair value at ending balance $ 9,541 [3],[5],[29] $ 9,495 [18],[19],[28]  
Interest 9.50% [3],[5],[29] 9.50% [18],[19],[28]  
Interest 13.40% [3],[5],[29] 11.60% [18],[19],[28]  
Investment, Identifier [Axis]: Bariacum S.A, Consumer Products, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 5,944    
Fair value at ending balance $ 3,314 [3],[4],[5],[41] $ 5,944 [11],[18],[19],[35]  
Interest 4.75% [3],[4],[5],[41] 5.50% [11],[18],[19],[35]  
Interest 8.60% [3],[4],[5],[41] 6.70% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Benify (Bennevis AB), High Tech Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[46] $ 1,060    
Fair value at ending balance $ 1,096 [3],[4],[5],[47] $ 1,060 [11],[18],[19],[46]  
Interest 5.25% [3],[4],[5],[47] 5.25% [11],[18],[19],[46]  
Interest 9.30% [3],[4],[5],[47] 7.90% [11],[18],[19],[46]  
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Other Financial, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 2,493    
Fair value at ending balance $ 2,944 [2],[3],[5],[8] $ 2,493 [18],[19],[33]  
Interest 4.50% [2],[3],[5],[8] 4.50% [18],[19],[33]  
Interest 10.00% [2],[3],[5],[8] 8.90% [18],[19],[33]  
Investment, Identifier [Axis]: Bidwax, Non-durable Consumer Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 7,254    
Fair value at ending balance $ 7,672 [3],[4],[5],[41] $ 7,254 [11],[18],[19],[35]  
Interest 6.50% [3],[4],[5],[41] 6.50% [11],[18],[19],[35]  
Interest 10.50% [3],[4],[5],[41] 8.60% [11],[18],[19],[35]  
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[26] $ 2,020    
Interest [3],[4],[5],[26] 5.50%    
Interest [3],[4],[5],[26] 10.80%    
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] $ 2,484    
Fair value at ending balance [11],[18],[19],[25]   $ 2,484  
Interest [11],[18],[19],[25]   5.50%  
Interest [11],[18],[19],[25]   9.80%  
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] 792    
Fair value at ending balance $ 353 [2],[3],[4],[5] $ 792 [11],[18],[19],[38]  
Interest 5.75% [2],[3],[4],[5] 5.50% [11],[18],[19],[38]  
Interest 11.10% [2],[3],[4],[5] 9.00% [11],[18],[19],[38]  
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[39] $ 801    
Interest [3],[4],[5],[39] 5.75%    
Interest [3],[4],[5],[39] 11.10%    
Investment, Identifier [Axis]: Biolam Group, Consumer Non-cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[28] $ 2,939    
Fair value at ending balance $ 2,266 [3],[4],[5],[8],[29] $ 2,939 [18],[19],[28]  
Interest 4.25% [3],[4],[5],[8],[29] 6.25%  
Interest 5.50% [3],[4],[5],[8],[29] 8.20%  
Investment, interest rate, paid in kind [3],[4],[5],[8],[29] 2.80%    
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 5,647 [48] $ 0  
Gross Additions 1,330 [48],[49] 5,647  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) 189 [48] 0  
Fair value at ending balance [48] 7,166 5,647  
Amount of Interest or Dividends Credited to Income $ 1,401 [48],[51] $ 544  
Interest 14.40% 13.50%  
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 9,147 [48] $ 0  
Gross Additions 0 [48],[49] 9,628  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) (4,278) [48] (481)  
Fair value at ending balance [48] 4,869 9,147  
Amount of Interest or Dividends Credited to Income $ 0 [48],[51] $ 0  
Investment, interest rate, paid in kind 10.00% 10.00%  
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[19],[33] $ 5,647    
Fair value at ending balance $ 7,166 [3],[5],[12],[27],[52] $ 5,647 [13],[18],[19],[33]  
Interest [13],[18],[19],[33]   9.10%  
Interest [13],[18],[19],[33]   13.50%  
Investment, interest rate, paid in kind [3],[5],[12],[27],[52] 14.40%    
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[16],[19] $ 9,147    
Fair value at ending balance $ 4,869 [5],[12],[37],[52] $ 9,147 [13],[16],[19]  
Investment, interest rate, paid in kind 10.00% [5],[12],[37],[52] 10.00% [13],[16],[19]  
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, Hotel, Gaming & Leisure, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 0    
Fair value at ending balance $ 0 [5],[14],[52] $ 0 [13],[19],[20]  
Investment owned, balance (in shares) 44.6 [5],[6],[7],[14],[52] 44.6 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 0 [48] $ 0  
Gross Additions 0 [48],[49] 0  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) 0 [48] 0  
Fair value at ending balance [48] 0 0  
Amount of Interest or Dividends Credited to Income $ 0 [48],[51] $ 0  
Investment owned, balance (in shares) 44.6 44.6  
Investment, Identifier [Axis]: Bounteous, Inc., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 1,735    
Fair value at ending balance $ 1,605 [2],[3],[5],[8] $ 1,735 [17],[18],[19]  
Interest 5.25% [2],[3],[5],[8] 5.25% [17],[18],[19]  
Interest 10.70% [2],[3],[5],[8] 10.00% [17],[18],[19]  
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Municipal Revenue Bond      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 28,300    
Fair value at ending balance $ 28,802 $ 28,300  
Interest 11.50% 11.50%  
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Preferred Stock- Series A      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 15,003    
Investment, interest rate, paid in kind [5] 7.00%    
Investment owned, balance (in shares) [5],[6],[7],[15] 14,618    
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Preferred Stock- Series C      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 14,731    
Fair value at ending balance [19]   $ 14,731  
Investment, interest rate, paid in kind [19]   7.00%  
Investment owned, balance (in shares) [9],[10],[19]   14,618  
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 4,724    
Fair value at ending balance $ 4,540 [2],[3],[5] $ 4,724 [17],[18],[19]  
Interest 5.75% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 11.20% [2],[3],[5] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 1,152    
Fair value at ending balance $ 930 [3],[5],[14] $ 1,152 [19],[20]  
Investment owned, balance (in shares) 1,107,492.71 [3],[5],[6],[7],[14],[15] 1,107,492.71 [9],[10],[19],[20]  
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (12)    
Fair value at ending balance $ 839 [2],[3],[5],[8] $ (12) [17],[18],[19]  
Interest 5.75% [2],[3],[5],[8] 5.75% [17],[18],[19]  
Interest 11.20% [2],[3],[5],[8] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: Brightline Trains Florida LLC, Transportation, Senior Secured Note      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 4,350    
Fair value at ending balance $ 4,750 [5] $ 4,350 [19]  
Interest 8.00% [5] 8.00% [19]  
Investment, Identifier [Axis]: Brightpay Limited, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 2,156    
Fair value at ending balance $ 2,250 [3],[4],[5],[8],[29] $ 2,156 [11],[18],[19],[28]  
Interest 5.00% [3],[4],[5],[8],[29] 5.00% [11],[18],[19],[28]  
Interest 9.00% [3],[4],[5],[8],[29] 6.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: British Airways 2020-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 692    
Fair value at ending balance $ 610 $ 692  
Interest 8.40% 8.40%  
Investment, Identifier [Axis]: British Engineering Services Holdco Limited, Commercial Services & Supplies, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 13,454    
Fair value at ending balance $ 14,403 [3],[4],[5],[43] $ 13,454 [11],[18],[19],[38]  
Interest 7.00% [3],[4],[5],[43] 7.00% [11],[18],[19],[38]  
Interest 11.90% [3],[4],[5],[43] 9.30% [11],[18],[19],[38]  
Investment, Identifier [Axis]: Brook & Whittle Holding Corp., Containers, Packaging & Glass, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[25] $ 2,478    
Fair value at ending balance $ 2,596 [2],[3],[5],[12] $ 2,478 [13],[18],[25]  
Interest 4.00% [2],[3],[5],[12] 4.00% [13],[18],[25]  
Interest 9.50% [2],[3],[5],[12] 8.50% [13],[18],[25]  
Investment, Identifier [Axis]: Brown Machine Group Holdings, LLC, Industrial Equipment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 6,281    
Fair value at ending balance $ 5,954 [3],[5],[27] $ 6,281 [17],[18],[19]  
Interest 5.75% [3],[5],[27] 5.25% [17],[18],[19]  
Interest 11.20% [3],[5],[27] 10.00% [17],[18],[19]  
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 446    
Fair value at ending balance $ 462 [5],[14] $ 446 [19],[20]  
Investment owned, balance (in shares) 455 [5],[6],[7],[14],[15] 455 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 4,390    
Fair value at ending balance $ 4,368 [3],[5],[27] $ 4,390 [18],[19],[36]  
Interest 9.00% [3],[5],[27] 9.00% [18],[19],[36]  
Interest 14.40% [3],[5],[27] 13.30% [18],[19],[36]  
Investment, Identifier [Axis]: CATAWBA RIVER LIMITED, Finance Companies, Structured - Junior Note      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 5,239    
Fair value at ending balance [11],[19]   $ 5,239  
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 1,341    
Fair value at ending balance $ 4,636 [2],[3],[5],[8] $ 1,341 [17],[18],[19]  
Interest 6.25% [2],[3],[5],[8] 6.25% [17],[18],[19]  
Interest 11.90% [2],[3],[5],[8] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 4,879    
Fair value at ending balance $ 1,275 [2],[3],[5],[8] $ 4,879 [17],[18],[19]  
Interest 6.25% [2],[3],[5],[8] 6.25% [17],[18],[19]  
Interest 11.90% [2],[3],[5],[8] 11.00% [17],[18],[19]  
Investment, Identifier [Axis]: CAi Software, LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (24)    
Fair value at ending balance $ (61) [2],[3],[5],[8] $ (24) [17],[18],[19]  
Interest 6.25% [2],[3],[5],[8] 6.25% [17],[18],[19]  
Interest 11.90% [2],[3],[5],[8] 11.00% [17],[18],[19]  
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 10,377    
Fair value at ending balance $ 12,968 [2],[3],[5] $ 10,377 [18],[19],[33]  
Interest 5.75% [2],[3],[5] 4.50% [18],[19],[33]  
Interest 11.30% [2],[3],[5] 8.80% [18],[19],[33]  
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 1,344    
Fair value at ending balance $ 1,344 [2],[3],[5] $ 1,344 [18],[19],[25]  
Interest 5.75% [2],[3],[5] 4.75% [18],[19],[25]  
Interest 11.30% [2],[3],[5] 9.30% [18],[19],[25]  
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 1,027    
Fair value at ending balance $ 1,190 [5],[14] $ 1,027 [19],[20]  
Investment owned, balance (in shares) 657 [5],[6],[7],[14],[15] 551 [9],[10],[19],[20]  
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ (49)    
Fair value at ending balance $ (33) [2],[3],[5],[8],[16] $ (49) [18],[19],[33]  
Interest 5.75% [2],[3],[5],[8],[16] 4.50% [18],[19],[33]  
Interest 11.30% [2],[3],[5],[8],[16] 8.80% [18],[19],[33]  
Investment, Identifier [Axis]: CM Acquisitions Holdings Inc., Internet & Direct Marketing, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 18,060    
Fair value at ending balance $ 13,399 [2],[3],[5] $ 18,060 [18],[19],[25]  
Interest 5.00% [2],[3],[5] 5.00% [18],[19],[25]  
Interest 10.20% [2],[3],[5] 9.00% [18],[19],[25]  
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 3,928    
Fair value at ending balance $ 3,742 [3],[5],[27] $ 3,928 [17],[18],[19]  
Interest 5.00% [3],[5],[27] 5.00% [17],[18],[19]  
Interest 10.40% [3],[5],[27] 9.20% [17],[18],[19]  
Investment, interest rate, paid in kind [3],[5],[27] 0.30%    
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[27] $ 609    
Interest [3],[5],[27] 5.00%    
Interest [3],[5],[27] 10.40%    
Investment, interest rate, paid in kind [3],[5],[27] 0.30%    
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 165    
Fair value at ending balance $ 59 [5],[14] $ 165 [19]  
Investment owned, balance (in shares) 12,635 [5],[6],[7],[14],[15] 8,782 [9],[10],[19]  
Investment, Identifier [Axis]: CSL DualCom, Tele-communications, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[53] $ 1,921    
Fair value at ending balance $ 2,052 [3],[4],[5],[8],[54] $ 1,921 [11],[18],[19],[53]  
Interest 5.25% [3],[4],[5],[8],[54] 5.25% [11],[18],[19],[53]  
Interest 10.50% [3],[4],[5],[8],[54] 8.70% [11],[18],[19],[53]  
Investment, Identifier [Axis]: CT Technologies Intermediate Holdings, Inc., Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[33] $ 4,505    
Fair value at ending balance $ 4,684 [3],[12],[27] $ 4,505 [13],[18],[33]  
Interest 4.25% [3],[12],[27] 4.25% [13],[18],[33]  
Interest 9.70% [3],[12],[27] 8.60% [13],[18],[33]  
Investment, Identifier [Axis]: CVL 3, Capital Equipment, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 891    
Fair value at ending balance [11],[18],[19],[28]   $ 891  
Interest [11],[18],[19],[28]   5.50%  
Interest [11],[18],[19],[28]   7.60%  
Investment, Identifier [Axis]: CVL 3, Capital Equipment, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] 1,122    
Fair value at ending balance [11],[18],[19],[25]   $ 1,122  
Interest [11],[18],[19],[25]   5.50%  
Interest [11],[18],[19],[25]   10.20%  
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 2,759    
Interest [2],[3],[5] 6.00%    
Interest [2],[3],[5] 11.40%    
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 204    
Fair value at ending balance $ 289 [5],[14] $ 204 [19],[20]  
Investment owned, balance (in shares) 161,290.32 [5],[6],[7],[14],[15] 161,290.32 [9],[10],[19],[20]  
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries,First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 2,766    
Fair value at ending balance [18],[19],[33]   $ 2,766  
Interest [18],[19],[33]   6.00%  
Interest [18],[19],[33]   10.40%  
Investment, Identifier [Axis]: Cadent, LLC (f/k/a Cross MediaWorks), Media & Entertainment, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 6,580    
Fair value at ending balance [17],[18],[19]   $ 6,580  
Interest [17],[18],[19]   6.50%  
Interest [17],[18],[19]   11.20%  
Investment, Identifier [Axis]: Cadent, LLC (f/k/a Cross MediaWorks), Media & Entertainment, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 11,080    
Fair value at ending balance [17],[18],[19]   $ 11,080  
Interest [17],[18],[19]   6.50%  
Interest [17],[18],[19]   11.20%  
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class A Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 292    
Fair value at ending balance [11],[19],[20]   $ 292  
Investment owned, balance (in shares) 500,000 [4],[5],[6],[7],[14],[15] 500,000 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class C - Warrants      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 0    
Fair value at ending balance [11],[19],[20]   $ 0  
Investment owned, balance (in shares) 257,127.45 [4],[5],[6],[7],[14],[15] 74,712.64 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[55] $ 1,468    
Fair value at ending balance $ 1,322 [3],[4],[5],[56] $ 1,468 [11],[18],[19],[55]  
Interest 3.50% [3],[4],[5],[56] 7.00% [11],[18],[19],[55]  
Interest 9.00% [3],[4],[5],[56] 11.90% [11],[18],[19],[55]  
Investment, interest rate, paid in kind [3],[4],[5],[56] 3.50%    
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] $ 4,269    
Fair value at ending balance $ 4,240 [2],[3],[4],[5] $ 4,269 [11],[18],[19],[25]  
Interest 7.64% [2],[3],[4],[5] 7.64% [11],[18],[19],[25]  
Interest 14.00% [2],[3],[4],[5] 12.50% [11],[18],[19],[25]  
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 627    
Fair value at ending balance $ 982 [4],[5],[14] $ 627 [11],[19],[20]  
Investment owned, balance (in shares) 681,818 [4],[5],[6],[7],[14],[15] 681,818 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units - Class X Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investment owned, balance (in shares) [4],[5],[6],[7],[14],[15] 45,604    
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [20] $ 1,339    
Fair value at ending balance [20]   $ 1,339  
Interest   8.50%  
Investment owned, balance (in shares) [9],[10],[20]   94,155  
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, First Lien Senior Secured Note      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 5,113    
Fair value at ending balance   $ 5,113  
Investment, Identifier [Axis]: Cascade Residential Services LLC, Electric, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8] $ (8)    
Interest [3],[5],[8] 10.40%    
Interest [3],[5],[8] 5.00%    
Investment, Identifier [Axis]: Cascade Residential Services LLC,Electric,First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8] $ 2,567    
Interest [3],[5],[8] 5.00%    
Interest [3],[5],[8] 10.40%    
Investment, Identifier [Axis]: Catawba River Limited, Finance Companies, Structured - Junior Note      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[8] $ 943    
Investment, Identifier [Axis]: Celebration Bidco, LLC, Chemicals, Plastics, & Rubber, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance $ 6,214    
Interest 8.00%    
Interest 13.30%    
Investment, Identifier [Axis]: Celebration Bidco, LLC, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] $ 0    
Gross Additions [21],[22] 12,177    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] 0    
Fair value at ending balance [21] 12,177 0  
Amount of Interest or Dividends Credited to Income [21],[24] $ 0    
Investment owned, balance (in shares) 1,243,071    
Investment, Identifier [Axis]: Celebration Bidco, LLC, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] $ 0    
Gross Additions [21],[22] 6,214    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] 0    
Fair value at ending balance [21] 6,214 0  
Amount of Interest or Dividends Credited to Income [21],[24] $ 0    
Interest 8.00%    
Interest 13.30%    
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Diversified Financial Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 820    
Fair value at ending balance $ 3,144 [3],[4],[5],[29] $ 820 [11],[18],[19],[28]  
Interest 5.25% [3],[4],[5],[29] 5.25% [11],[18],[19],[28]  
Interest 9.20% [3],[4],[5],[29] 7.10% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Diversified Financial Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 1,158    
Fair value at ending balance [11],[18],[19],[28]   $ 1,158  
Interest [11],[18],[19],[28]   5.75%  
Interest [11],[18],[19],[28]   7.60%  
Investment, Identifier [Axis]: Ceres Pharma NV, Pharma-ceuticals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] 3,139    
Fair value at ending balance $ 3,307 [3],[4],[5],[41] $ 3,139 [11],[18],[19],[35]  
Interest 6.00% [3],[4],[5],[41] 5.50% [11],[18],[19],[35]  
Interest 10.10% [3],[4],[5],[41] 7.10% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Charming Charlie LLC, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 0 $ 0  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Investment owned, balance (in shares)   34,923,249  
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 $ 0  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Interest   20.00%  
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 $ 0  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Interest   10.40%  
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 $ 0  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 35  
Interest   12.00%  
Interest   15.70%  
Investment, Identifier [Axis]: Charming Charlie LLC, First Lien Senior Secured Term Loan 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 $ 0  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Interest   5.00%  
Interest   8.70%  
Investment, Identifier [Axis]: Cineworld Group PLC, Leisure Products, Warrants      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] 0    
Fair value at ending balance [11],[19],[20]   $ 0  
Investment owned, balance (in shares) [9],[10],[11],[19],[20]   553,375  
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] 6,189    
Fair value at ending balance $ 6,602 [2],[3],[5],[8] $ 6,189 [18],[19],[33]  
Interest 5.75% [2],[3],[5],[8] 5.75% [18],[19],[33]  
Interest 11.30% [2],[3],[5],[8] 10.10% [18],[19],[33]  
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 599    
Interest [2],[3],[5] 5.75%    
Interest [2],[3],[5] 11.30%    
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers,First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 523    
Fair value at ending balance [18],[19],[33]   $ 523  
Interest [18],[19],[33]   5.75%  
Interest [18],[19],[33]   10.10%  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure ,LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Investment owned, balance (in shares) [5],[6],[7],[14] 2,407,825    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure ,LLC Units, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance $ 12,177    
Investment owned, balance (in shares) 1,243,071    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 6,868    
Interest [5] 8.00%    
Investment, interest rate, paid in kind [5] 10.00%    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 15,649    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] 0    
Gross Additions [21],[22] 12,732    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] (572)    
Fair value at ending balance [21] 12,160 [5],[14] $ 0  
Amount of Interest or Dividends Credited to Income [21],[24] $ 0    
Investment owned, balance (in shares) 2,407,825    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 10,729    
Fair value at ending balance [19],[20]   $ 10,729  
Investment owned, balance (in shares) [9],[10],[19],[20]   2,037,735  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, Subordinated Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] 6,036    
Fair value at ending balance [19]   $ 6,036  
Investment, interest rate, paid in kind [19]   10.00%  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, Subordinated Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] 15,528    
Fair value at ending balance [19]   $ 15,528  
Interest [19]   8.00%  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] 0    
Gross Additions [21],[22] 15,632    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] 17    
Fair value at ending balance [21] 15,649 $ 0  
Amount of Interest or Dividends Credited to Income [21],[24] $ 715    
Interest 8.00%    
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] $ 0    
Gross Additions [21],[22] 6,879    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] (11)    
Fair value at ending balance [21] 6,868 0  
Amount of Interest or Dividends Credited to Income [21],[24] $ 371    
Investment, interest rate, paid in kind 10.00%    
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, Diversified Manufacturing      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 1,270    
Fair value at ending balance [11],[17],[18],[19]   $ 1,270  
Interest [11],[17],[18],[19]   6.25%  
Interest [11],[17],[18],[19]   11.00%  
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[4],[5] $ 1,294    
Interest [2],[3],[4],[5] 6.25%    
Interest [2],[3],[4],[5] 11.60%    
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, Class B Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 196    
Fair value at ending balance $ 176 [5],[14] $ 196 [19],[20]  
Investment owned, balance (in shares) 33,324.69 [5],[6],[7],[14],[15] 33,324.69 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 13,302    
Fair value at ending balance $ 13,345 [3],[5],[27] $ 13,302 [18],[19],[36]  
Interest 6.75% [3],[5],[27] 7.75% [18],[19],[36]  
Interest 12.10% [3],[5],[27] 12.10% [18],[19],[36]  
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 159    
Fair value at ending balance $ 142 [5],[14] $ 159 [19],[20]  
Investment owned, balance (in shares) 46,085.6 [5],[6],[7],[14],[15] 46,085.6 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Compass Precision, LLC, Aerospace & Defense, Senior Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 369    
Fair value at ending balance $ 622 [5] $ 369 [19]  
Interest 11.00% [5] 11.00% [19]  
Investment, interest rate, paid in kind 1.00% [5] 1.00% [19]  
Investment, Identifier [Axis]: Comply365, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[32] $ 13,446    
Fair value at ending balance $ 5,525 [2],[3],[5] $ 13,446 [18],[19],[32]  
Interest 5.00% [2],[3],[5] 5.75% [18],[19],[32]  
Interest 10.40% [2],[3],[5] 10.60% [18],[19],[32]  
Investment, Identifier [Axis]: Comply365, LLC, Technology, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 12,997    
Interest [2],[3],[5] 5.00%    
Interest [2],[3],[5] 10.40%    
Investment, Identifier [Axis]: Comply365, LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[32] $ 148    
Fair value at ending balance $ (22) [2],[3],[5],[8] $ 148 [18],[19],[32]  
Interest 5.00% [2],[3],[5],[8] 5.75% [18],[19],[32]  
Interest 10.40% [2],[3],[5],[8] 10.60% [18],[19],[32]  
Investment, Identifier [Axis]: Contabo Finco S.À R.L, Internet Software & Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 4,845    
Fair value at ending balance $ 5,103 [3],[4],[5],[29] $ 4,845 [11],[18],[19],[28]  
Interest 5.25% [3],[4],[5],[29] 6.00% [11],[18],[19],[28]  
Interest 9.20% [3],[4],[5],[29] 7.60% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [20] $ 7    
Fair value at ending balance $ 133 [4],[14] $ 7 [20]  
Investment owned, balance (in shares) 91,504 [4],[6],[7],[14],[15] 91,504 [9],[10],[20]  
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Equipment Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[37] $ 22,976    
Interest [4],[5],[37] 9.80%    
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [16],[19] $ 11,118    
Fair value at ending balance [16],[19]   $ 11,118  
Interest [16],[19]   13.00%  
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class A Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] 196    
Fair value at ending balance $ 211 [4],[5],[14] $ 196 [11],[19],[20]  
Investment owned, balance (in shares) 440 [4],[5],[6],[7],[14],[15] 440 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class B Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 497    
Fair value at ending balance $ 505 [4],[5],[14] $ 497 [11],[19],[20]  
Investment owned, balance (in shares) 191 [4],[5],[6],[7],[14],[15] 191 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 4,233    
Fair value at ending balance $ 4,659 [3],[4],[5],[8],[29] $ 4,233 [11],[18],[19],[35]  
Interest 3.25% [3],[4],[5],[8],[29] 3.25% [11],[18],[19],[35]  
Interest 6.30% [3],[4],[5],[8],[29] 3.30% [11],[18],[19],[35]  
Investment, interest rate, paid in kind 3.40% [3],[4],[5],[8],[29] 3.50% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Custom Alloy Corporation, Manufacturer of Pipe Fittings & Forgings, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [16],[19],[57] $ 189    
Fair value at ending balance [16],[19],[57]   $ 189  
Investment, interest rate, paid in kind [16],[19],[57]   15.00%  
Investment, Identifier [Axis]: Custom Alloy Corporation, Manufacturer of Pipe Fittings & Forgings, Second Lien Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [16],[19],[57] 1,997    
Fair value at ending balance [16],[19],[57]   $ 1,997  
Investment, interest rate, paid in kind [16],[19],[57]   15.00%  
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] 5,491    
Fair value at ending balance $ 5,944 [3],[5],[8],[27] $ 5,491 [18],[19],[36]  
Interest 5.50% [3],[5],[8],[27] 5.50% [18],[19],[36]  
Interest 10.80% [3],[5],[8],[27] 9.80% [18],[19],[36]  
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 0    
Fair value at ending balance $ 90 [3],[5],[8],[27] $ 0 [18],[19],[36]  
Interest 5.50% [3],[5],[8],[27] 5.50% [18],[19],[36]  
Interest 10.80% [3],[5],[8],[27] 9.80% [18],[19],[36]  
Investment, Identifier [Axis]: DataOnline Corp., High Tech Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18],[19] $ 14,259    
Fair value at ending balance [13],[17],[18],[19]   $ 14,259  
Interest [13],[17],[18],[19]   6.25%  
Interest [13],[17],[18],[19]   11.00%  
Investment, Identifier [Axis]: DataOnline Corp., High Tech Industries, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18],[19] 2,100    
Fair value at ending balance [13],[17],[18],[19]   $ 2,100  
Interest [13],[17],[18],[19]   6.25%  
Interest [13],[17],[18],[19]   11.00%  
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] 1,875    
Fair value at ending balance $ 1,873 [2],[3],[5] $ 1,875 [18],[19],[25]  
Interest 5.75% [2],[3],[5] 6.00% [18],[19],[25]  
Interest 11.10% [2],[3],[5] 10.30% [18],[19],[25]  
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 96    
Fair value at ending balance $ 96 [5],[14] $ 96 [19],[20]  
Investment owned, balance (in shares) 96,153.85 [5],[6],[7],[14],[15] 96,153.85 [19],[20]  
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ (11)    
Fair value at ending balance $ (7) [2],[3],[5],[8] $ (11) [18],[19],[25]  
Interest 5.75% [2],[3],[5],[8] 6.00% [18],[19],[25]  
Interest 11.10% [2],[3],[5],[8] 10.30% [18],[19],[25]  
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 48    
Fair value at ending balance $ 41 [5],[14] $ 48 [19],[20]  
Investment owned, balance (in shares) 1,280.8 [5],[6],[7],[14],[15] 1,280.8 [9],[10],[19],[20]  
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 690    
Fair value at ending balance $ 1,638 [3],[5],[27] $ 690 [18],[19],[33]  
Interest 6.25% [3],[5],[27] 6.00% [18],[19],[33]  
Interest 11.70% [3],[5],[27] 10.40% [18],[19],[33]  
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ (3)    
Fair value at ending balance $ (9) [3],[5],[8],[27] $ (3) [18],[19],[33]  
Interest 6.25% [3],[5],[8],[27] 6.00% [18],[19],[33]  
Interest 11.70% [3],[5],[8],[27] 10.40% [18],[19],[33]  
Investment, Identifier [Axis]: Distinct Holdings, Inc., Systems Software, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 6,096    
Fair value at ending balance $ 6,416 [2],[3],[5] $ 6,096 [17],[18],[19]  
Interest 6.50% [2],[3],[5] 6.50% [17],[18],[19]  
Interest 12.00% [2],[3],[5] 10.70% [17],[18],[19]  
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[41] $ 2,734    
Interest [3],[4],[5],[41] 6.75%    
Interest [3],[4],[5],[41] 10.90%    
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 2,515    
Fair value at ending balance [11],[18],[19],[28]   $ 2,515  
Interest [11],[18],[19],[28]   6.50%  
Interest [11],[18],[19],[28]   8.10%  
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] 1,153    
Fair value at ending balance [11],[18],[19],[35]   $ 1,153  
Interest [11],[18],[19],[35]   6.75%  
Interest [11],[18],[19],[35]   8.90%  
Investment, Identifier [Axis]: DreamStart Bidco SAS (d/b/a SmartTrade), Diversified Financial Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] 2,247    
Fair value at ending balance $ 2,349 [3],[4],[5],[29] $ 2,247 [11],[18],[19],[28]  
Interest 5.25% [3],[4],[5],[29] 6.00% [11],[18],[19],[28]  
Interest 9.20% [3],[4],[5],[29] 8.20% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Dryden 43 Senior Loan Fund, Series 2016-43A, Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] $ 2,084    
Fair value at ending balance 1,647 [4],[12] $ 2,084 [11],[13]  
Investment, Identifier [Axis]: Dryden 49 Senior Loan Fund, Series 2017-49A, Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] 4,267    
Fair value at ending balance 3,319 [4],[12],[14] 4,267 [11],[13]  
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] 111    
Fair value at ending balance $ 115 [3],[4],[5],[8] $ 111 [11],[18],[19],[28]  
Interest 6.00% [3],[4],[5],[8] 5.75% [11],[18],[19],[28]  
Interest 10.00% [3],[4],[5],[8] 8.00% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 1,209    
Fair value at ending balance $ 1,401 [2],[3],[4],[5] $ 1,209 [11],[17],[18],[19]  
Interest 6.00% [2],[3],[4],[5] 5.75% [11],[17],[18],[19]  
Interest 11.30% [2],[3],[4],[5] 10.50% [11],[17],[18],[19]  
Investment, Identifier [Axis]: Dunlipharder B.V., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] $ 988    
Fair value at ending balance $ 993 [2],[3],[4],[5] $ 988 [11],[18],[19],[25]  
Interest 6.10% [2],[3],[4],[5] 6.50% [11],[18],[19],[25]  
Interest 11.50% [2],[3],[4],[5] 10.70% [11],[18],[19],[25]  
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 14,479    
Interest [2],[3],[5] 5.75%    
Interest [2],[3],[5] 11.20%    
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 25,287    
Fair value at ending balance [17],[18],[19]   $ 25,287  
Interest [17],[18],[19]   6.00%  
Interest [17],[18],[19]   10.70%  
Investment, Identifier [Axis]: EFC International, Automotive, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 301    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 163.83    
Investment, Identifier [Axis]: EFC International, Automotive, Senior Unsecured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 764    
Interest [5] 11.00%    
Investment, interest rate, paid in kind [5] 2.50%    
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 12,008    
Fair value at ending balance $ 11,155 [2],[3],[5] $ 12,008 [17],[18],[19]  
Interest 5.75% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 11.50% [2],[3],[5] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 1,409    
Fair value at ending balance $ 2,233 [2],[3],[5],[8] $ 1,409 [17],[18],[19]  
Interest 5.75% [2],[3],[5],[8] 5.75% [17],[18],[19]  
Interest 11.50% [2],[3],[5],[8] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Electrical Components & Equipment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 6,024    
Fair value at ending balance $ 5,740 [2],[3],[5] $ 6,024 [17],[18],[19]  
Interest 5.75% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 11.10% [2],[3],[5] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Partnership Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 933    
Fair value at ending balance $ 491 [5],[14] $ 933 [19],[20]  
Investment owned, balance (in shares) 530.92 [5],[6],[7],[14],[15] 530.92 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 9,100    
Fair value at ending balance $ 8,844 [2],[3],[5] $ 9,100 [17],[18],[19]  
Interest 7.00% [2],[3],[5] 7.00% [17],[18],[19]  
Interest 12.50% [2],[3],[5] 11.70% [17],[18],[19]  
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Revolver, Funded      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 5,300    
Fair value at ending balance 5,500 $ 5,300  
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] 135,066    
Fair value at ending balance $ 145,799 [5] $ 135,066 [19]  
Investment owned, balance (in shares) 89,447,396 [5],[6],[7] 89,447,396 [9],[10],[19]  
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[33] $ 5,273    
Fair value at ending balance $ 5,545 [5],[8],[27] $ 5,273 [19],[33]  
Interest 7.25% [5],[8],[27] 7.25% [19],[33]  
Interest [5],[8],[27] 12.60%    
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 4,545    
Fair value at ending balance $ 4,545 [5] $ 4,545 [19]  
Interest 7.50% [5] 7.50% [19]  
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, LLC units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 135,066 [21] $ 92,668  
Gross Additions 354 [21],[22] 3,380  
Gross Reductions (621) [21],[23] 0  
Amount of Realized Gain (Loss) 0 [21] 0  
Amount of Unrealized Gain (Loss) 11,000 [21] 39,018  
Fair value at ending balance [21] 145,799 135,066  
Amount of Interest or Dividends Credited to Income $ 14,498 [21],[24] $ 11,223  
Investment owned, balance (in shares) 89,447,396 89,447,396  
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 5,273 [21] $ 1,818  
Gross Additions 35,201 [21],[22] 5,292  
Gross Reductions (34,909) [21],[23] (1,818)  
Amount of Realized Gain (Loss) 0 [21] 0  
Amount of Unrealized Gain (Loss) (20) [21] (19)  
Fair value at ending balance [21] 5,545 5,273  
Amount of Interest or Dividends Credited to Income $ 408 [21],[24] $ 488  
Interest 7.25% 7.25%  
Interest 12.60%    
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 4,545 [21] $ 4,738  
Gross Additions 6 [21],[22] 5  
Gross Reductions 0 [21],[23] 0  
Amount of Realized Gain (Loss) 0 [21] 0  
Amount of Unrealized Gain (Loss) (6) [21] (198)  
Fair value at ending balance [21] 4,545 4,545  
Amount of Interest or Dividends Credited to Income $ 347 [21],[24] $ 343  
Interest 7.50% 7.50%  
Investment, Identifier [Axis]: Ellkay, LLC, Healthcare and Pharmaceuticals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 4,893    
Fair value at ending balance $ 4,430 [2],[3],[5] $ 4,893 [17],[18],[19]  
Interest 6.25% [2],[3],[5] 6.25% [17],[18],[19]  
Interest 11.50% [2],[3],[5] 11.00% [17],[18],[19]  
Investment, Identifier [Axis]: Entact Environmental Services, Inc., Environmental Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 5,529    
Fair value at ending balance $ 7,245 [2],[3],[5] $ 5,529 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 10.90% [2],[3],[5] 11.70% [17],[18],[19]  
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 1,352    
Fair value at ending balance $ 1,047 [3],[4],[5],[8],[29] $ 1,352 [11],[18],[19],[28]  
Interest 4.50% [3],[4],[5],[8],[29] 6.75% [11],[18],[19],[28]  
Interest 8.50% [3],[4],[5],[8],[29] 8.90% [11],[18],[19],[28]  
Investment, interest rate, paid in kind [3],[4],[5],[8],[29] 2.80%    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] $ 745    
Fair value at ending balance $ 700 [2],[3],[4],[5] $ 745 [11],[18],[19],[25]  
Interest 4.50% [2],[3],[4],[5] 6.75% [11],[18],[19],[25]  
Interest 9.80% [2],[3],[4],[5] 11.50% [11],[18],[19],[25]  
Investment, interest rate, paid in kind [2],[3],[4],[5] 2.80%    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 2,111    
Fair value at ending balance $ 2,096 [3],[4],[5],[39] $ 2,111 [11],[18],[19],[38]  
Interest 4.50% [3],[4],[5],[39] 6.75% [11],[18],[19],[38]  
Interest 9.50% [3],[4],[5],[39] 10.00% [11],[18],[19],[38]  
Investment, interest rate, paid in kind [3],[4],[5],[39] 2.80%    
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 4      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 513    
Fair value at ending balance [11],[19]   $ 513  
Investment, interest rate, paid in kind [11],[19]   11.50%  
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Senior Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5] $ 543    
Investment, interest rate, paid in kind [4],[5] 11.50%    
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[58] $ 1,573    
Fair value at ending balance $ 1,535 [3],[4],[5],[8],[45] $ 1,573 [11],[18],[19],[58]  
Interest 6.50% [3],[4],[5],[8],[45] 6.00% [11],[18],[19],[58]  
Interest 10.80% [3],[4],[5],[8],[45] 9.30% [11],[18],[19],[58]  
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[45] $ 20    
Interest [3],[4],[5],[45] 6.50%    
Interest [3],[4],[5],[45] 10.80%    
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 7,106    
Fair value at ending balance $ 6,324 [2],[3],[5] $ 7,106 [18],[19],[36]  
Interest 6.50% [2],[3],[5] 6.50% [18],[19],[36]  
Interest 12.20% [2],[3],[5] 10.30% [18],[19],[36]  
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 137    
Fair value at ending balance $ 138 [2],[3],[5],[8] $ 137 [18],[19],[36]  
Interest 6.50% [2],[3],[5],[8] 6.50% [18],[19],[36]  
Interest 12.20% [2],[3],[5],[8] 10.30% [18],[19],[36]  
Investment, Identifier [Axis]: F24 (Stairway BidCo Gmbh), Software Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 1,644    
Fair value at ending balance $ 1,933 [3],[4],[5],[29] $ 1,644 [11],[18],[19],[28]  
Interest 6.50% [3],[4],[5],[29] 6.25% [11],[18],[19],[28]  
Interest 10.50% [3],[4],[5],[29] 8.10% [11],[18],[19],[28]  
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 6,767    
Fair value at ending balance $ 4,768 [2],[3],[5] $ 6,767 [18],[19],[33]  
Interest 5.75% [2],[3],[5] 5.75% [18],[19],[33]  
Interest 11.10% [2],[3],[5] 10.10% [18],[19],[33]  
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 17    
Fair value at ending balance $ 16 [5],[14] $ 17 [19],[20]  
Investment owned, balance (in shares) 1,160.9 [5],[6],[7],[14],[15] 1,160.9 [9],[10],[19],[20]  
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 75    
Fair value at ending balance $ 72 [5],[14] $ 75 [19],[20]  
Investment owned, balance (in shares) 5,104.3 [5],[6],[7],[14],[15] 5,104.3 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Faraday, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[8] $ 1,632    
Interest [3],[4],[8] 6.25%    
Interest [3],[4],[8] 10.20%    
Investment, Identifier [Axis]: Ferrellgas L.P., Oil & Gas Equipment & Services, Opco Preferred Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 2,742    
Fair value at ending balance $ 2,670 [5] $ 2,742 [19]  
Investment owned, balance (in shares) 2,886 [5],[6],[7],[15] 2,886 [9],[10],[19]  
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings Inc., Business Equipment & Services, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 6,084    
Fair value at ending balance $ 5,266 [5] $ 6,084 [19]  
Investment, interest rate, paid in kind 11.00% [5] 11.00% [19]  
Investment owned, balance (in shares) 6,582.7 [5],[6],[7],[15] 6,582.7 [9],[10],[19]  
Investment, Identifier [Axis]: Finaxy Holding, Banking, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5] $ 2,009    
Investment, interest rate, paid in kind [4],[5] 10.30%    
Investment, Identifier [Axis]: Finaxy Holding,Banking,First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[29] $ 4,431    
Interest [3],[4],[5],[29] 6.25%    
Interest [3],[4],[5],[29] 10.20%    
Investment, Identifier [Axis]: Fineline Technologies, Inc, Consumer Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 1,275    
Interest [2],[3],[5] 4.75%    
Interest [2],[3],[5] 10.10%    
Investment, Identifier [Axis]: Fineline Technologies, Inc., Consumer Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 1,270    
Fair value at ending balance [17],[18],[19]   $ 1,270  
Interest [17],[18],[19]   4.75%  
Interest [17],[18],[19]   9.50%  
Investment, Identifier [Axis]: Finexvet, Consumer Cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] 2,329    
Fair value at ending balance $ 4,230 [3],[4],[5],[8],[41] $ 2,329 [11],[18],[19],[35]  
Interest 6.25% [3],[4],[5],[8],[41] 6.25% [11],[18],[19],[35]  
Interest 9.90% [3],[4],[5],[8],[41] 8.10% [11],[18],[19],[35]  
Investment, Identifier [Axis]: FitzMark Buyer, LLC, Cargo & Transportation, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 4,165    
Fair value at ending balance $ 4,073 [3],[5],[27] $ 4,165 [17],[18],[19]  
Interest 4.75% [3],[5],[27] 4.50% [17],[18],[19]  
Interest 10.10% [3],[5],[27] 8.90% [17],[18],[19]  
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 962    
Fair value at ending balance $ 855 [5],[14] $ 962 [19],[20]  
Investment owned, balance (in shares) 966.99 [5],[6],[7],[14],[15] 966.99 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 13,295    
Fair value at ending balance $ 13,404 [2],[3],[5] $ 13,295 [18],[19],[25]  
Interest 7.25% [2],[3],[5] 7.25% [18],[19],[25]  
Interest 12.60% [2],[3],[5] 12.00% [18],[19],[25]  
Investment, Identifier [Axis]: Flexential Issuer, LLC, Information Technology, Structured Secured Note - Class C      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 13,827    
Fair value at ending balance $ 13,187 $ 13,827  
Interest 6.90% 6.90%  
Investment, Identifier [Axis]: Flywheel Re Segregated Portfolio 2022-4, Investment Funds, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 1,932    
Fair value at ending balance $ 3,196 [4],[5],[14] $ 1,932 [11],[19],[20]  
Investment owned, balance (in shares) 2,828,286 [4],[5],[6],[7],[14],[15] 1,921,648 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Footco 40 Limited, Media & Entertainment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 1,437    
Fair value at ending balance $ 1,808 [3],[4],[5],[8],[39] $ 1,437 [11],[18],[19],[38]  
Interest 6.75% [3],[4],[5],[8],[39] 5.75% [11],[18],[19],[38]  
Interest 11.90% [3],[4],[5],[8],[39] 9.20% [11],[18],[19],[38]  
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Other Financial, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 1,513    
Fair value at ending balance $ 2,480 [2],[3],[5] $ 1,513 [18],[19],[36]  
Interest 5.25% [2],[3],[5] 5.25% [18],[19],[36]  
Interest 10.70% [2],[3],[5] 9.90% [18],[19],[36]  
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 4,638    
Fair value at ending balance $ 4,384 [2],[3],[5] $ 4,638 [17],[18],[19]  
Interest 5.75% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 11.40% [2],[3],[5] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 1,179    
Fair value at ending balance $ 632 [5],[14] $ 1,179 [19],[20]  
Investment owned, balance (in shares) 937.5 [5],[6],[7],[14],[15] 937.5 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [20] $ 158    
Fair value at ending balance [20]   $ 158  
Investment owned, balance (in shares) [9],[10],[20]   192,000  
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 4,871    
Fair value at ending balance [17],[18],[19]   $ 4,871  
Interest [17],[18],[19]   12.50%  
Interest [17],[18],[19]   17.20%  
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] 16,271    
Fair value at ending balance [18],[19],[25]   $ 16,271  
Interest [18],[19],[25]   6.50%  
Interest [18],[19],[25]   10.50%  
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] 687    
Fair value at ending balance [19],[20]   $ 687  
Investment owned, balance (in shares) [19],[20]   687  
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] (77)    
Fair value at ending balance [18],[19],[25]   $ (77)  
Interest [18],[19],[25]   6.50%  
Interest [18],[19],[25]   10.50%  
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 10,573    
Interest [2],[3],[5] 6.25%    
Interest [2],[3],[5] 11.60%    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 880    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 687    
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (15)    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.60%    
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[14] $ 0    
Investment owned, balance (in shares) [4],[5],[6],[7],[14],[15] 5,785    
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[59] $ 265    
Interest [3],[4],[5],[59] 10.00%    
Interest [3],[4],[5],[59] 13.80%    
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[8] $ 124    
Investment, interest rate, paid in kind [4],[5],[8] 10.00%    
Investment, Identifier [Axis]: GPZN II GmbH, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[40] $ 375    
Fair value at ending balance [11],[18],[19],[40]   $ 375  
Interest [11],[18],[19],[40]   5.50%  
Interest [11],[18],[19],[40]   7.40%  
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Second Lien Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[57] 10,442    
Fair value at ending balance [19],[57]   $ 10,442  
Interest [19],[57]   11.00%  
Investment, interest rate, paid in kind [19],[57]   1.00%  
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Series A Preferred Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20],[57] 2,252    
Fair value at ending balance [19],[20],[57]   $ 2,252  
Investment owned, balance (in shares) [9],[10],[19],[20],[57]   1,434,472.41  
Investment, Identifier [Axis]: GTM Intermediate Holdings, Inc., Medical Equipment Manufacturer, Series C Preferred Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20],[57] 2,158    
Fair value at ending balance [19],[20],[57]   $ 2,158  
Investment owned, balance (in shares) [9],[10],[19],[20],[57]   715,649.59  
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[58] 2,438    
Fair value at ending balance $ 2,478 [3],[4],[5],[60] $ 2,438 [11],[18],[19],[58]  
Interest 6.00% [3],[4],[5],[60] 6.00% [11],[18],[19],[58]  
Interest 10.30% [3],[4],[5],[60] 9.10% [11],[18],[19],[58]  
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[61] $ 4,242    
Fair value at ending balance $ 4,295 [3],[4],[5],[8],[62] $ 4,242 [11],[18],[19],[61]  
Interest 6.00% [3],[4],[5],[8],[62] 6.00% [11],[18],[19],[61]  
Interest 11.70% [3],[4],[5],[8],[62] 9.10% [11],[18],[19],[61]  
Investment, Identifier [Axis]: Gojo Industries, Inc. ,Industrial Other,First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 12,359    
Interest [2],[3],[5] 5.00%    
Interest [2],[3],[5] 10.40%    
Investment, interest rate, paid in kind [2],[3],[5] 4.50%    
Investment, Identifier [Axis]: Greenhill II BV, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 716    
Fair value at ending balance $ 894 [3],[4],[5],[8],[29] $ 716 [11],[18],[19],[28]  
Interest 5.25% [3],[4],[5],[8],[29] 5.75% [11],[18],[19],[28]  
Interest 9.20% [3],[4],[5],[8],[29] 7.10% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Groupe Guemas,Brokerage, Asset Managers & Exchanges ,First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5] $ 5,006    
Interest [3],[4],[5] 6.25%    
Interest [3],[4],[5] 10.10%    
Investment, Identifier [Axis]: Groupe Product Life, Consumer Non-cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 598    
Fair value at ending balance $ 1,059 [3],[4],[5],[29] $ 598 [11],[18],[19],[28]  
Interest 6.50% [3],[4],[5],[29] 6.25% [11],[18],[19],[28]  
Interest 10.40% [3],[4],[5],[29] 8.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Gulf Finance, LLC, Oil & Gas Exploration & Production, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[33] $ 772    
Fair value at ending balance $ 570 [2],[3] $ 772 [18],[33]  
Interest 6.75% [2],[3] 6.75% [18],[33]  
Interest 12.20% [2],[3] 11.00% [18],[33]  
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd., Consumer Non-Cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[44] $ 2,136    
Fair value at ending balance $ 2,235 [3],[4],[5],[8],[60] $ 2,136 [18],[19],[44]  
Interest 6.50% [3],[4],[5],[8],[60] 6.50% [18],[19],[44]  
Interest 10.90% [3],[4],[5],[8],[60] 10.20% [18],[19],[44]  
Investment, Identifier [Axis]: HEKA Invest, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 4,846    
Fair value at ending balance $ 5,080 [3],[4],[5],[8],[29] $ 4,846 [11],[18],[19],[28]  
Interest 6.50% [3],[4],[5],[8],[29] 6.50% [11],[18],[19],[28]  
Interest 10.40% [3],[4],[5],[8],[29] 8.70% [11],[18],[19],[28]  
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 11,355    
Interest [2],[3],[5],[8] 8.50%    
Interest [2],[3],[5],[8] 14.00%    
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ (18)    
Fair value at ending balance $ (7) [2],[3],[5],[8] $ (18) [18],[19],[25]  
Interest 8.50% [2],[3],[5],[8] 8.50% [18],[19],[25]  
Interest 14.00% [2],[3],[5],[8] 11.70% [18],[19],[25]  
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Second Lien Note      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 11,363    
Fair value at ending balance [18],[19],[25]   $ 11,363  
Interest [18],[19],[25]   8.50%  
Interest [18],[19],[25]   11.70%  
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 4,928    
Fair value at ending balance $ 10,816 [2],[3],[5] $ 4,928 [17],[18],[19]  
Interest 6.25% [2],[3],[5] 5.00% [17],[18],[19]  
Interest 11.80% [2],[3],[5] 6.00% [17],[18],[19]  
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 5,834    
Fair value at ending balance [18],[19],[33]   $ 5,834  
Interest [18],[19],[33]   5.00%  
Interest [18],[19],[33]   9.30%  
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[58] 598    
Fair value at ending balance $ 674 [3],[4],[5],[8],[60] $ 598 [11],[19],[58]  
Interest 4.75% [3],[4],[5],[8],[60] 5.25% [11],[19],[58]  
Interest 9.40% [3],[4],[5],[8],[60] 8.60% [11],[19],[58]  
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 1,151    
Fair value at ending balance $ 11,012 [5] $ 1,151 [19]  
Investment, interest rate, paid in kind 11.00% [5] 11.00% [19]  
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 9,183    
Fair value at ending balance [19]   $ 9,183  
Investment, interest rate, paid in kind [19]   11.00%  
Investment, Identifier [Axis]: Heartland, LLC, Business Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 13,795    
Fair value at ending balance [17],[18],[19]   $ 13,795  
Interest [17],[18],[19]   4.75%  
Interest [17],[18],[19]   9.50%  
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] 7,276    
Fair value at ending balance $ 7,295 [3],[5],[27] $ 7,276 [18],[19],[33]  
Interest 5.50% [3],[5],[27] 5.75% [18],[19],[33]  
Interest 10.90% [3],[5],[27] 9.90% [18],[19],[33]  
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ (33)    
Fair value at ending balance $ 0 [3],[5],[8],[27] $ (33) [18],[19],[33]  
Interest 5.50% [3],[5],[8],[27] 5.75% [18],[19],[33]  
Interest 10.90% [3],[5],[8],[27] 9.90% [18],[19],[33]  
Investment, Identifier [Axis]: Heilbron (f/k/a Sucsez (Bolt Bidco B.V.)), Insurance, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 3,148    
Fair value at ending balance $ 3,155 [3],[4],[5],[41] $ 3,148 [11],[18],[19],[28]  
Interest 5.00% [3],[4],[5],[41] 5.00% [11],[18],[19],[28]  
Interest 8.90% [3],[4],[5],[41] 6.90% [11],[18],[19],[28]  
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 101    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 101,080    
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 7,101    
Interest [2],[3],[5] 6.00%    
Interest [2],[3],[5] 11.40%    
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 342    
Interest [2],[3],[5],[8] 6.00%    
Interest [2],[3],[5],[8] 11.40%    
Investment, Identifier [Axis]: Holland Acquisition Corp., Energy: Oil & Gas, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[16],[18],[19],[34] $ 0    
Fair value at ending balance [13],[16],[18],[19],[34]   $ 0  
Interest [13],[16],[18],[19],[34]   9.00%  
Investment, Identifier [Axis]: Home Care Assistance, LLC, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] 3,621    
Fair value at ending balance $ 3,428 [2],[3],[5] $ 3,621 [18],[19],[36]  
Interest 5.00% [2],[3],[5] 5.00% [18],[19],[36]  
Interest 10.50% [2],[3],[5] 9.40% [18],[19],[36]  
Investment, Identifier [Axis]: HomeX Services Group LLC, Home Construction, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ 1,274    
Interest [3],[5],[8],[27] 5.50%    
Interest [3],[5],[8],[27] 10.90%    
Investment, Identifier [Axis]: HomeX Services Group LLC, Home Construction, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ (7)    
Interest [3],[5],[8],[27] 5.50%    
Interest [3],[5],[8],[27] 10.90%    
Investment, Identifier [Axis]: Honour Lane Logistics Holdings Limited, Transportation Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[32] $ 7,814    
Fair value at ending balance $ 6,160 [3],[4],[5],[27] $ 7,814 [11],[18],[19],[32]  
Interest 5.00% [3],[4],[5],[27] 5.25% [11],[18],[19],[32]  
Interest 10.50% [3],[4],[5],[27] 9.50% [11],[18],[19],[32]  
Investment, Identifier [Axis]: Hygie 31 Holding, Pharma-ceuticals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 1,665    
Fair value at ending balance $ 1,739 [3],[4],[5],[41] $ 1,665 [11],[18],[19],[28]  
Interest 6.25% [3],[4],[5],[41] 6.25% [11],[18],[19],[28]  
Interest 10.40% [3],[4],[5],[41] 8.40% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 4,496 [21] $ 0  
Gross Additions 0 [21],[22] 5,219  
Gross Reductions 0 [21],[23] 0  
Amount of Realized Gain (Loss) 0 [21] 0  
Amount of Unrealized Gain (Loss) (2,483) [21] (723)  
Fair value at ending balance [21] 2,013 4,496  
Amount of Interest or Dividends Credited to Income $ 0 [21],[24] $ 0  
Investment owned, balance (in shares) 102,144 102,144  
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 4,496    
Fair value at ending balance $ 2,013 [5],[14] $ 4,496 [19],[20]  
Investment owned, balance (in shares) 102,144 [5],[6],[7],[14] 102,144 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 3,917    
Fair value at ending balance $ 3,917 [2],[3],[5] $ 3,917 [18],[19],[25]  
Interest 8.00% [2],[3],[5] 8.00% [18],[19],[25]  
Interest 13.40% [2],[3],[5] 12.30% [18],[19],[25]  
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[21],[25] $ 4,098    
Gross Additions [21],[22] 421    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] 0    
Fair value at ending balance [21] 4,519 [2],[3],[5] $ 4,098 [18],[19],[25]  
Amount of Interest or Dividends Credited to Income [21],[24] $ 665    
Interest [2],[3],[5] 3.00%    
Interest 8.50% [2],[3],[5] 14.30% [18],[19],[25]  
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 3,917 [21] $ 0  
Gross Additions 75 [21],[22] 3,569  
Gross Reductions 0 [21],[23] 0  
Amount of Realized Gain (Loss) 0 [21] 101  
Amount of Unrealized Gain (Loss) (75) [21] 247  
Fair value at ending balance [21] 3,917 3,917  
Amount of Interest or Dividends Credited to Income $ 592 [21],[24] $ 380  
Interest 8.00% 8.00%  
Interest 13.40% 12.30%  
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 4,098 $ 0  
Gross Additions   4,098  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   4,098  
Amount of Interest or Dividends Credited to Income   $ 382  
Interest [18],[19],[25]   10.00%  
Interest   14.30%  
Investment, Identifier [Axis]: IM Analytics Holding, LLC (d/b/a NVT), Electronic Instruments & Components, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] 3,247    
Fair value at ending balance [18],[19],[33]   $ 3,247  
Interest [18],[19],[33]   8.00%  
Interest [18],[19],[33]   12.40%  
Investment, Identifier [Axis]: IM Analytics Holding, LLC (d/b/a NVT), Electronic Instruments & Components, Warrants      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] 0    
Fair value at ending balance [19],[20]   $ 0  
Investment owned, balance (in shares) [9],[10],[19],[20]   68,950  
Investment, Identifier [Axis]: IM Square, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] 2,583    
Fair value at ending balance $ 2,713 [3],[4],[5],[29] $ 2,583 [11],[18],[19],[28]  
Interest 5.50% [3],[4],[5],[29] 5.25% [11],[18],[19],[28]  
Interest 9.50% [3],[4],[5],[29] 7.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: INOS 19-090 GmbH, Aerospace & Defense, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 4,892    
Fair value at ending balance $ 5,711 [3],[4],[5],[8],[29] $ 4,892 [11],[18],[19],[28]  
Interest 5.37% [3],[4],[5],[8],[29] 5.40% [11],[18],[19],[28]  
Interest 9.30% [3],[4],[5],[8],[29] 7.40% [11],[18],[19],[28]  
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Healthcare First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 6,616    
Interest [2],[3],[5] 6.25%    
Interest [2],[3],[5] 11.60%    
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Healthcare, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (18)    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.60%    
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 127    
Fair value at ending balance $ 715 [5],[14] $ 127 [19],[20]  
Investment owned, balance (in shares) 7,500.4 [5],[6],[7],[8],[15] 1,433.37 [9],[10],[19],[20]  
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 703    
Fair value at ending balance $ 12,757 [2],[3],[5] $ 703 [18],[19],[33]  
Interest 6.50% [2],[3],[5] 4.75% [18],[19],[33]  
Interest 12.00% [2],[3],[5] 9.10% [18],[19],[33]  
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 5    
Fair value at ending balance $ 67 [2],[3],[5],[8] $ 5 [18],[19],[33]  
Interest 6.50% [2],[3],[5],[8] 4.75% [18],[19],[33]  
Interest 12.00% [2],[3],[5],[8] 9.10% [18],[19],[33]  
Investment, Identifier [Axis]: Infoniqa Holdings GmbH, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 2,729    
Fair value at ending balance $ 2,879 [3],[4],[5] $ 2,729 [11],[18],[19],[35]  
Interest 4.75% [3],[4],[5] 5.25% [11],[18],[19],[35]  
Interest 8.70% [3],[4],[5] 6.20% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 5,495    
Fair value at ending balance [11],[18],[19],[35]   $ 5,495  
Interest [11],[18],[19],[35]   6.50%  
Interest [11],[18],[19],[35]   9.30%  
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[41] $ 6,203    
Interest [3],[4],[5],[8],[41] 5.75%    
Interest [3],[4],[5],[8],[41] 9.60%    
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[63] $ 1,035    
Interest [3],[4],[5],[63] 5.75%    
Interest [3],[4],[5],[63] 7.50%    
Investment, Identifier [Axis]: Innovative XCessories & Services, LLC, Automotive, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[34] $ 2,277    
Fair value at ending balance $ 2,469 [3],[12],[26] $ 2,277 [13],[18],[34]  
Interest 4.25% [3],[12],[26] 4.25% [13],[18],[34]  
Interest 9.90% [3],[12],[26] 7.80% [13],[18],[34]  
Investment, Identifier [Axis]: Interstellar Group B.V., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 1,239    
Fair value at ending balance $ 1,676 [3],[4],[5],[8],[29] $ 1,239 [11],[18],[19],[28]  
Interest 5.50% [3],[4],[5],[8],[29] 5.25% [11],[18],[19],[28]  
Interest 9.40% [3],[4],[5],[8],[29] 7.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: InvoCare Limited, Consumer Cyclical Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[60] $ 2,051    
Interest [3],[4],[5],[8],[60] 6.25%    
Interest [3],[4],[5],[8],[60] 10.70%    
Investment, Identifier [Axis]: Iqor US Inc., Services: Business, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[33] $ 2,658    
Fair value at ending balance $ 2,622 [3],[12],[27] $ 2,658 [13],[18],[33]  
Interest 7.50% [3],[12],[27] 7.50% [13],[18],[33]  
Interest 13.00% [3],[12],[27] 11.90% [13],[18],[33]  
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 0    
Investment owned, balance (in shares) [5],[6],[14],[15] 58,538    
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[16],[17],[18],[19] $ 553    
Fair value at ending balance $ 718 [2],[3],[12] $ 553 [13],[16],[17],[18],[19]  
Interest 5.60% [2],[3],[12] 5.75% [13],[16],[17],[18],[19]  
Interest [2],[3],[12] 10.60%    
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Trading Companies & Distributors, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[40] $ 4,436    
Fair value at ending balance $ 4,778 [3],[4],[5],[8],[29] $ 4,436 [11],[18],[19],[40]  
Interest 6.50% [3],[4],[5],[8],[29] 6.50% [11],[18],[19],[40]  
Interest 10.50% [3],[4],[5],[8],[29] 8.10% [11],[18],[19],[40]  
Investment, Identifier [Axis]: Ivanti Software, Inc., High Tech Industries, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18] $ 3,383    
Fair value at ending balance $ 4,800 [2],[3],[12] $ 3,383 [17],[18]  
Interest 7.25% [2],[3],[12] 7.25% [17],[18]  
Interest 12.90% [2],[3],[12] 12.00% [17],[18]  
Investment, Identifier [Axis]: JF Acquisition, LLC, Automotive, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 3,575    
Fair value at ending balance $ 3,598 [2],[3],[5] $ 3,575 [18],[19],[33]  
Interest 5.50% [2],[3],[5] 5.50% [18],[19],[33]  
Interest 11.00% [2],[3],[5] 9.90% [18],[19],[33]  
Investment, Identifier [Axis]: JSC Tekers Holdings, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 0 $ 0  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Investment owned, balance (in shares)   3,201  
Investment, Identifier [Axis]: JSC Tekers Holdings, Common Stock, Controlled Investment      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 $ 0  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Investment owned, balance (in shares)   35,571  
Investment, Identifier [Axis]: JSC Tekers Holdings, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 $ 6,197  
Gross Additions   0  
Gross Reductions   (6,197)  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Investment owned, balance (in shares)   9,159,085  
Investment, Identifier [Axis]: JSC Tekers Holdings, Preferred Stock, Controlled Investment      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 $ 0  
Gross Additions   6,197  
Gross Reductions   (5,832)  
Amount of Realized Gain (Loss)   1,079  
Amount of Unrealized Gain (Loss)   (1,444)  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   0  
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), Aerospace & Defense, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] 4,009    
Fair value at ending balance $ 1,176 [3],[4],[5],[41] $ 4,009 [11],[18],[19],[35]  
Interest 5.25% [3],[4],[5],[41] 5.50% [11],[18],[19],[35]  
Interest 9.30% [3],[4],[5],[41] 7.90% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), Aerospace & Defense, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[32] $ 6,592    
Fair value at ending balance $ 6,648 [3],[4],[5],[26] $ 6,592 [11],[18],[19],[32]  
Interest 5.25% [3],[4],[5],[26] 5.50% [11],[18],[19],[32]  
Interest 10.60% [3],[4],[5],[26] 9.30% [11],[18],[19],[32]  
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Other Financial, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 7,617    
Fair value at ending balance [18],[19],[25]   $ 7,617  
Interest [18],[19],[25]   5.00%  
Interest [18],[19],[25]   9.50%  
Investment, Identifier [Axis]: Jaguar Merger Sub Inc., Other Financial, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] (2)    
Fair value at ending balance [18],[19],[25]   $ (2)  
Interest [18],[19],[25]   5.00%  
Interest [18],[19],[25]   9.50%  
Investment, Identifier [Axis]: Jedson Engineering, Inc., Engineering & Construction Management, First Lien Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[57] 2,650    
Fair value at ending balance [19],[57]   $ 2,650  
Interest [19],[57]   12.00%  
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 3,511    
Fair value at ending balance   $ 3,511  
Interest   8.00%  
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Structured Products, Structured Secured Note - Class B      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance $ 3,026    
Interest 8.00%    
Investment, Identifier [Axis]: Jocassee Partners LLC, Investment Funds & Vehicles, 9.1% Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11] $ 40,088    
Fair value at ending balance [11]   $ 40,088  
Investment, Identifier [Axis]: Jocassee Partners LLC, Investment Funds & Vehicles, Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[8] 41,053    
Investment, Identifier [Axis]: Jocassee Partners LLC, Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 40,088 37,601  
Gross Additions 0 [22] 5,000  
Gross Reductions 0 [23] 0  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) 965 (2,513)  
Fair value at ending balance 41,053 40,088  
Amount of Interest or Dividends Credited to Income 5,709 [24] 1,427  
Investment, Identifier [Axis]: Jon Bidco Limited, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[61] 3,477    
Fair value at ending balance $ 3,844 [3],[4],[5],[8],[62] $ 3,477 [11],[18],[19],[61]  
Interest 4.50% [3],[4],[5],[8],[62] 5.50% [11],[18],[19],[61]  
Interest 10.20% [3],[4],[5],[8],[62] 10.20% [11],[18],[19],[61]  
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 2,745    
Fair value at ending balance $ 3,414 [2],[3],[5] $ 2,745 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 11.00% [2],[3],[5] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 115    
Fair value at ending balance $ 228 [5] $ 115 [19],[20]  
Investment owned, balance (in shares) 1,018 [5],[6],[7],[15] 974.68 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (6)    
Fair value at ending balance $ (8) [2],[3],[5],[8] $ (6) [17],[18],[19]  
Interest 5.50% [2],[3],[5],[8] 5.75% [17],[18],[19]  
Interest 11.00% [2],[3],[5],[8] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[34] $ 5,545    
Fair value at ending balance $ 5,545 [2],[3],[5],[8] $ 5,545 [18],[19],[34]  
Interest 5.00% [2],[3],[5],[8] 5.00% [18],[19],[34]  
Interest 10.50% [2],[3],[5],[8] 10.10% [18],[19],[34]  
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, Partnership Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 191    
Fair value at ending balance $ 224 [5],[14] $ 191 [19],[20]  
Investment owned, balance (in shares) 203.2 [5],[6],[7],[14],[15] 203.2 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 1,181 [21] $ 0  
Gross Additions 0 [21],[22] 1,589  
Gross Reductions (2,300) [21],[23] 0  
Amount of Realized Gain (Loss) 711 [21] 0  
Amount of Unrealized Gain (Loss) 408 [21] (408)  
Fair value at ending balance [21] 0 1,181  
Amount of Interest or Dividends Credited to Income $ 0 [21],[24] $ 0  
Investment owned, balance (in shares) 6.78 6.78  
Investment, Identifier [Axis]: Kemmerer Operations, LLC, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 1,565 [21] $ 0  
Gross Additions 237 [21],[22] 2,785  
Gross Reductions (1,802) [21],[23] (1,220)  
Amount of Realized Gain (Loss) 0 [21] 0  
Amount of Unrealized Gain (Loss) 0 [21] 0  
Fair value at ending balance [21] 0 1,565  
Amount of Interest or Dividends Credited to Income $ 156 [21],[24] $ 307  
Investment, interest rate, paid in kind 15.00% 15.00%  
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Metals & Mining, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 1,181    
Fair value at ending balance [13],[19],[20]   $ 1,181  
Investment owned, balance (in shares) [9],[10],[13],[19],[20]   6.78  
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Metals & Mining, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19] 1,565    
Fair value at ending balance [13],[19]   $ 1,565  
Investment, interest rate, paid in kind [13],[19]   15.00%  
Investment, Identifier [Axis]: Kene Acquisition, Inc. (En Engineering), Oil & Gas Equipment & Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 7,027    
Fair value at ending balance $ 7,031 [2],[3],[5] $ 7,027 [17],[18],[19]  
Interest 4.25% [2],[3],[5] 4.25% [17],[18],[19]  
Interest 9.70% [2],[3],[5] 9.00% [17],[18],[19]  
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 9,125    
Fair value at ending balance $ 9,116 [2],[3],[5] $ 9,125 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 10.80% [2],[3],[5] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 577    
Fair value at ending balance $ 599 [5],[14] $ 577 [19],[20]  
Investment owned, balance (in shares) 637,677.11 [5],[6],[7],[14],[15] 637,677.11 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Kona Buyer, LLC, High Tech Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 8,623    
Fair value at ending balance $ 8,413 [2],[3],[5] $ 8,623 [18],[19],[25]  
Interest 4.75% [2],[3],[5] 4.75% [18],[19],[25]  
Interest 10.10% [2],[3],[5] 9.30% [18],[19],[25]  
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 4,397    
Fair value at ending balance $ 1,854 [3],[5],[8],[29] $ 4,397 [11],[18],[19],[28]  
Interest 6.25% [3],[5],[8],[29] 6.00% [11],[18],[19],[28]  
Interest 10.40% [3],[5],[8],[29] 8.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 1,409    
Fair value at ending balance $ 1,587 [4],[5] $ 1,409 [11],[19]  
Investment, interest rate, paid in kind 12.00% [4],[5] 12.00% [11],[19]  
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[32] $ 633    
Fair value at ending balance $ 659 [3],[4],[5],[8],[26] $ 633 [11],[18],[19],[32]  
Interest 5.75% [3],[4],[5],[8],[26] 5.25% [11],[18],[19],[32]  
Interest 11.10% [3],[4],[5],[8],[26] 8.30% [11],[18],[19],[32]  
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] $ 34    
Fair value at ending balance $ 16 [3],[4],[5],[8],[26] $ 34 [11],[18],[19],[25]  
Interest 5.75% [3],[4],[5],[8],[26] 5.25% [11],[18],[19],[25]  
Interest 11.10% [3],[4],[5],[8],[26] 9.80% [11],[18],[19],[25]  
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 10,150    
Fair value at ending balance $ 10,096 [2],[3],[5] $ 10,150 [17],[18],[19]  
Interest 5.75% [2],[3],[5] 4.75% [17],[18],[19]  
Interest 11.20% [2],[3],[5] 9.50% [17],[18],[19]  
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 65    
Fair value at ending balance $ 239 [5] $ 65 [19],[20]  
Investment owned, balance (in shares) 81,739 [5],[6],[7],[15] 52,493.44 [9],[10],[19],[20]  
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (32)    
Fair value at ending balance $ 400 [2],[3],[5],[8] $ (32) [17],[18],[19]  
Interest 5.75% [2],[3],[5],[8] 4.75% [17],[18],[19]  
Interest 11.20% [2],[3],[5],[8] 9.50% [17],[18],[19]  
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[33] $ 100    
Fair value at ending balance $ 5,311 [3],[27] $ 100 [18],[33]  
Interest 5.50% [3],[27] 3.25% [18],[33]  
Interest 10.90% [3],[27] 7.60% [18],[33]  
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17] $ 8,455    
Fair value at ending balance $ 4,037 [5],[14] $ 8,455 [17]  
Interest [17]   10.00%  
Interest [17]   3.00%  
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 94,441    
Investment, Identifier [Axis]: Legal Solutions Holdings, Business Services, Senior Subordinated Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [16],[19],[57] $ 0    
Fair value at ending balance $ 0 [5],[37],[64] $ 0 [16],[19],[57]  
Investment, interest rate, paid in kind 16.00% [5],[37],[64] 16.00% [16],[19],[57]  
Investment, Identifier [Axis]: Liberty Steel Holdings USA Inc., Industrial Other, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 19,846    
Fair value at ending balance [18],[19],[36]   $ 19,846  
Interest [18],[19],[36]   4.50%  
Interest [18],[19],[36]   8.80%  
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18],[19] 2,980    
Fair value at ending balance $ 2,675 [2],[3],[5],[12] $ 2,980 [13],[17],[18],[19]  
Interest 7.00% [2],[3],[5],[12] 7.00% [13],[17],[18],[19]  
Interest 12.70% [2],[3],[5],[12] 10.70% [13],[17],[18],[19]  
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18],[19] $ (168)    
Fair value at ending balance $ (275) [2],[3],[5],[8],[12] $ (168) [13],[17],[18],[19]  
Interest 7.00% [2],[3],[5],[8],[12] 7.00% [13],[17],[18],[19]  
Interest 12.70% [2],[3],[5],[8],[12] 10.70% [13],[17],[18],[19]  
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Business Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 837    
Fair value at ending balance $ 860 [2],[3],[5] $ 837 [17],[18],[19]  
Interest 5.00% [2],[3],[5] 5.00% [17],[18],[19]  
Interest 10.60% [2],[3],[5] 9.70% [17],[18],[19]  
Investment, Identifier [Axis]: LogMeIn, Inc., High Tech Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[33] $ 1,253    
Fair value at ending balance $ 1,274 [3],[12],[27] $ 1,253 [13],[18],[33]  
Interest 4.75% [3],[12],[27] 4.75% [13],[18],[33]  
Interest 10.30% [3],[12],[27] 9.10% [13],[18],[33]  
Investment, Identifier [Axis]: Long Term Care Group, Inc., Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 7,816    
Fair value at ending balance $ 6,308 [3],[5],[27] $ 7,816 [18],[19],[33]  
Interest 1.00% [3],[5],[27] 6.00% [18],[19],[33]  
Interest 6.30% [3],[5],[27] 10.30% [18],[19],[33]  
Investment, interest rate, paid in kind [3],[5],[27] 6.00%    
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 4,123    
Fair value at ending balance $ 4,133 [3],[5],[8] $ 4,123 [18],[19],[33]  
Interest 5.50% [3],[5],[8] 5.50% [18],[19],[33]  
Interest 11.00% [3],[5],[8] 9.90% [18],[19],[33]  
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 781    
Fair value at ending balance $ 778 [5],[14] $ 781 [19],[20]  
Investment owned, balance (in shares) 746.66 [5],[6],[7],[14],[15] 746.66 [9],[10],[19],[20]  
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction and Building, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 835    
Fair value at ending balance $ 901 [3],[5],[27] $ 835 [18],[19],[33]  
Interest 5.50% [3],[5],[27] 5.50% [18],[19],[33]  
Interest 11.00% [3],[5],[27] 9.90% [18],[19],[33]  
Investment, Identifier [Axis]: MNS Buyer, Inc., Construction and Building, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 54    
Fair value at ending balance $ 82 [5],[14] $ 54 [19],[20]  
Investment owned, balance (in shares) 76,923 [5],[6],[7],[14],[15] 76.92 [9],[10],[19],[20]  
Investment, Identifier [Axis]: MVC Automotive Group GmbH, Bridge Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 7,149 [48] $ 7,149  
Gross Additions 2,613 [48],[49] 0  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) 0 [48] 0  
Fair value at ending balance [48] 9,762 7,149  
Amount of Interest or Dividends Credited to Income $ 587 [48],[51] $ 435  
Interest 4.50%    
Investment, interest rate, paid in kind 1.50% 6.00%  
Investment, Identifier [Axis]: MVC Automotive Group GmbH, Common Equity Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 9,675 [48] $ 7,699  
Gross Additions 0 [48],[49] 0  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) 5,755 [48] 1,976  
Fair value at ending balance [48] 15,430 9,675  
Amount of Interest or Dividends Credited to Income $ 0 [48],[51] 0  
Investment owned, balance (in shares) 18,000   18,000
Investment, Identifier [Axis]: MVC Automotive Group Gmbh, Automotive, Bridge Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[57] $ 7,149    
Fair value at ending balance $ 9,762 [4],[5],[52],[64] $ 7,149 [11],[19],[57]  
Interest 4.50% [4],[5],[52],[64] 6.00% [9],[10],[11],[19],[57]  
Investment, interest rate, paid in kind [4],[5],[52],[64] 1.50%    
Investment, Identifier [Axis]: MVC Automotive Group Gmbh, Automotive, Common Equity interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20],[57] $ 9,675    
Fair value at ending balance $ 15,430 [4],[5],[14],[52],[64] $ 9,675 [11],[19],[20],[57]  
Investment owned, balance (in shares) 18,000 [4],[5],[6],[7],[14],[52],[64] 18,000 [9],[10],[11],[19],[20],[57]  
Investment, Identifier [Axis]: MVC Private Equity Fund LP, General Partnership Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 45    
Gross Additions [49] 0    
Gross Reductions [50] (24)    
Amount of Realized Gain (Loss) 0    
Amount of Unrealized Gain (Loss) 3    
Fair value at ending balance 24 $ 45  
Amount of Interest or Dividends Credited to Income [51] $ 95    
Investment owned, balance (in shares) 1,831.4   1,831.4
Investment, Identifier [Axis]: MVC Private Equity Fund LP, General Partnership Interest, Netting      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 45 188  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   (143)  
Fair value at ending balance   45  
Amount of Interest or Dividends Credited to Income   (831)  
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Investment Funds & Vehicles, General Partnership Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[57] 45    
Fair value at ending balance $ 24 [4],[14],[52],[64] $ 45 [11],[57]  
Investment owned, balance (in shares) 1,831.4 [4],[6],[7],[14],[52],[64] 1,831.4 [9],[10],[11],[57]  
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Investment Funds & Vehicles, Limited Partnership Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[57] $ 1,793    
Fair value at ending balance $ 981 [4],[14],[52],[64] $ 1,793 [11],[57]  
Investment owned, balance (in shares) 71,790.4 [4],[6],[7],[14],[52],[64] 71,790.4 [9],[10],[11],[57]  
Investment, Identifier [Axis]: MVC Private Equity Fund LP, Limited Partnership Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 1,793 $ 7,376  
Gross Additions 0 [49] 0  
Gross Reductions (940) [50] 0  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) 128 (5,583)  
Fair value at ending balance 981 1,793  
Amount of Interest or Dividends Credited to Income $ 0 [51] 0  
Investment owned, balance (in shares) 71,790.4   71,790.4
Investment, Identifier [Axis]: Magnetite XIX, Limited, Multi-Sector Holdings, Subordinated Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13],[17] $ 4,450    
Fair value at ending balance $ 5,067 [2],[4],[12] $ 4,450 [11],[13],[17]  
Interest 9.03% [2],[4],[12] 8.77% [11],[13],[17]  
Interest 14.40% [2],[4],[12] 12.80% [11],[13],[17]  
Investment, Identifier [Axis]: Magnetite XIX, Limited, Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] $ 7,992    
Fair value at ending balance 8,181 [4],[12] $ 7,992 [11],[13]  
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] 2,093    
Fair value at ending balance $ 1,777 [3],[4],[5],[8],[29] $ 2,093 [11],[18],[19],[35]  
Interest 6.75% [3],[4],[5],[8],[29] 6.00% [11],[18],[19],[35]  
Interest 3.90% [3],[4],[5],[8],[29] 8.80% [11],[18],[19],[35]  
Investment, interest rate, paid in kind [3],[4],[5],[8],[29] 6.80%    
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 40    
Fair value at ending balance $ 6 [3],[4],[5],[8],[29] $ 40 [11],[18],[19],[28]  
Interest 5.75% [3],[4],[5],[8],[29] 5.00% [11],[18],[19],[28]  
Interest 3.90% [3],[4],[5],[8],[29] 7.80% [11],[18],[19],[28]  
Investment, interest rate, paid in kind [3],[4],[5],[8],[29] 5.80%    
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 10,794    
Fair value at ending balance $ 10,462 [2],[3],[5] $ 10,794 [18],[19],[25]  
Interest 5.50% [2],[3],[5] 5.50% [18],[19],[25]  
Interest 11.00% [2],[3],[5] 9.80% [18],[19],[25]  
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[65] $ 1,217    
Fair value at ending balance $ 1,914 [2],[3],[5],[8] $ 1,217 [18],[19],[65]  
Interest 5.50% [2],[3],[5],[8] 4.50% [18],[19],[65]  
Interest 11.00% [2],[3],[5],[8] 11.50% [18],[19],[65]  
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 2,903    
Fair value at ending balance $ 2,764 [2],[3],[5] $ 2,903 [18],[19],[25]  
Interest 6.00% [2],[3],[5] 5.50% [18],[19],[25]  
Interest 11.60% [2],[3],[5] 10.30% [18],[19],[25]  
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[53] $ 3,894    
Fair value at ending balance $ 3,946 [3],[5],[39] $ 3,894 [18],[19],[53]  
Interest 6.00% [3],[5],[39] 6.00% [18],[19],[53]  
Interest 11.20% [3],[5],[39] 9.40% [18],[19],[53]  
Investment, Identifier [Axis]: Median B.V., Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[38] $ 7,449    
Fair value at ending balance $ 8,595 [3],[4],[43] $ 7,449 [11],[18],[38]  
Interest 6.00% [3],[4],[43] 6.00% [11],[18],[38]  
Interest 11.40% [3],[4],[43] 9.40% [11],[18],[38]  
Investment, Identifier [Axis]: Medical Solutions Parent Holdings, Inc., Healthcare, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[33] $ 4,067    
Fair value at ending balance $ 3,708 [2],[3] $ 4,067 [18],[33]  
Interest 7.00% [2],[3] 7.00% [18],[33]  
Interest 12.50% [2],[3] 11.40% [18],[33]  
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class A Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 116    
Fair value at ending balance $ 128 [4],[5],[14] $ 116 [11],[19],[20]  
Investment, interest rate, paid in kind [4],[5],[14] 9.00%    
Investment owned, balance (in shares) 114.4 [4],[5],[6],[7],[14],[15] 114.4 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class B Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 0    
Fair value at ending balance $ 51 [4],[5],[14] $ 0 [11],[19],[20]  
Investment owned, balance (in shares) 28,943.8 [4],[5],[6],[7],[14],[15] 28,943.8 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Mercell Holding AS, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[66] $ 3,102    
Fair value at ending balance $ 3,041 [3],[4],[8],[67] $ 3,102 [11],[18],[19],[66]  
Interest 5.50% [3],[4],[8],[67] 6.00% [11],[18],[19],[66]  
Interest 10.10% [3],[4],[8],[67] 9.10% [11],[18],[19],[66]  
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited., Non-durable Consumer Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[30] $ 7,634    
Fair value at ending balance $ 7,784 [3],[4],[5],[8],[45] $ 7,634 [11],[18],[19],[30]  
Interest 5.50% [3],[4],[5],[8],[45] 6.25% [11],[18],[19],[30]  
Interest 10.30% [3],[4],[5],[8],[45] 9.10% [11],[18],[19],[30]  
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[14] $ 1,380    
Investment owned, balance (in shares) [4],[5],[6],[7],[14],[15] 107,714    
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[39] $ 1,832    
Interest [3],[4],[5],[8],[39] 6.25%    
Interest [3],[4],[5],[8],[39] 11.60%    
Investment, Identifier [Axis]: Murphy Midco Limited, Media, Diversified & Production, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] $ 1,150    
Fair value at ending balance $ 1,670 [3],[4],[5],[43] $ 1,150 [11],[18],[19],[42]  
Interest 5.25% [3],[4],[5],[43] 5.00% [11],[18],[19],[42]  
Interest 10.70% [3],[4],[5],[43] 8.20% [11],[18],[19],[42]  
Investment, Identifier [Axis]: Music Reports, Inc., Media & Entertainment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 6,816    
Fair value at ending balance $ 6,884 [2],[3],[5] $ 6,816 [18],[19],[33]  
Interest 6.00% [2],[3],[5] 5.50% [18],[19],[33]  
Interest 11.50% [2],[3],[5] 9.80% [18],[19],[33]  
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Equity Co Invest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 473    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 472,512    
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 11,446    
Interest [2],[3],[5],[8] 5.75%    
Interest [2],[3],[5],[8] 11.10%    
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 335    
Interest [2],[3],[5],[8] 5.75%    
Interest [2],[3],[5],[8] 11.10%    
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 6,204    
Interest [2],[3],[5] 6.50%    
Interest [2],[3],[5] 11.80%    
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 633    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 639,510    
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 417    
Interest [2],[3],[5],[8] 6.50%    
Interest [2],[3],[5],[8] 11.80%    
Investment, Identifier [Axis]: NGS US Finco, LLC (f/k/a Dresser Natural Gas Solutions), Energy Equipment & Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 4,697    
Fair value at ending balance $ 4,655 [3],[5],[27] $ 4,697 [18],[19],[33]  
Interest 4.00% [3],[5],[27] 4.25% [18],[19],[33]  
Interest 9.50% [3],[5],[27] 8.60% [18],[19],[33]  
Investment, Identifier [Axis]: NPM Investments 28 B.V., Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 2,084    
Fair value at ending balance $ 2,175 [3],[4],[5],[8],[29] $ 2,084 [11],[18],[19],[28]  
Interest 6.00% [3],[4],[5],[8],[29] 6.25% [11],[18],[19],[28]  
Interest 9.90% [3],[4],[5],[8],[29] 8.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Napa Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[44] $ 16,963    
Fair value at ending balance $ 18,321 [3],[4],[5],[60] $ 16,963 [11],[18],[19],[44]  
Interest 5.50% [3],[4],[5],[60] 6.00% [11],[18],[19],[44]  
Interest 9.90% [3],[4],[5],[60] 9.60% [11],[18],[19],[44]  
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class A Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 300    
Fair value at ending balance $ 535 [5],[14] $ 300 [19],[20]  
Investment owned, balance (in shares) 4,587.38 [5],[6],[7],[14],[15] 4,587.38 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Class B Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 0    
Fair value at ending balance $ 229 [5],[14] $ 0 [19],[20]  
Investment owned, balance (in shares) 509.71 [5],[6],[7],[14],[15] 509.71 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 5,096    
Fair value at ending balance $ 5,562 [2],[3],[5] $ 5,096 [17],[18],[19]  
Interest 5.00% [2],[3],[5] 5.50% [17],[18],[19]  
Interest 10.50% [2],[3],[5] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 5    
Fair value at ending balance $ (8) [3],[5],[8] $ 5 [17],[18],[19]  
Interest 5.00% [3],[5],[8] 5.50% [17],[18],[19]  
Interest 10.50% [3],[5],[8] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 2,649    
Fair value at ending balance $ 2,918 [3],[5],[27] $ 2,649 [18],[19],[33]  
Interest 2.00% [3],[5],[27] 5.25% [18],[19],[33]  
Interest 7.40% [3],[5],[27] 9.60% [18],[19],[33]  
Investment, interest rate, paid in kind [3],[5],[27] 3.00%    
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 2,918    
Fair value at ending balance $ 2,620 [3],[5],[27] $ 2,918 [18],[19],[36]  
Interest 5.00% [3],[5],[27] 5.25% [18],[19],[36]  
Interest 10.40% [3],[5],[27] 9.60% [18],[19],[36]  
Investment, Identifier [Axis]: NeoxCo, Internet Software & Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[41] $ 2,090    
Interest [3],[4],[5],[8],[41] 6.50%    
Interest [3],[4],[5],[8],[41] 10.50%    
Investment, Identifier [Axis]: Next Holdco, LLC,Technology,First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ 7,236    
Interest [3],[5],[8],[27] 6.00%    
Interest [3],[5],[8],[27] 11.30%    
Investment, Identifier [Axis]: Next Holdco, LLC,Technology,Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ (11)    
Interest [3],[5],[8],[27] 6.00%    
Interest [3],[5],[8],[27] 11.30%    
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] $ 1,508    
Fair value at ending balance [11],[18],[19],[42]   $ 1,508  
Interest [11],[18],[19],[42]   5.25%  
Interest [11],[18],[19],[42]   7.40%  
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] 184    
Fair value at ending balance [11],[18],[19],[42]   $ 184  
Interest [11],[18],[19],[42]   5.25%  
Interest [11],[18],[19],[42]   7.40%  
Investment, Identifier [Axis]: Northstar Recycling, LLC, Environmental Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 2,446    
Fair value at ending balance $ 2,434 [2],[3],[5] $ 2,446 [17],[18],[19]  
Interest 4.75% [2],[3],[5] 4.75% [17],[18],[19]  
Interest 10.10% [2],[3],[5] 9.50% [17],[18],[19]  
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[44] $ 3,406    
Fair value at ending balance $ 3,984 [3],[4],[5],[8],[26] $ 3,406 [11],[18],[19],[44]  
Interest 5.25% [3],[4],[5],[8],[26] 5.25% [11],[18],[19],[44]  
Interest 11.10% [3],[4],[5],[8],[26] 8.80% [11],[18],[19],[44]  
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[32] $ 443    
Fair value at ending balance [11],[18],[19],[32]   $ 443  
Interest [11],[18],[19],[32]   5.75%  
Interest [11],[18],[19],[32]   9.60%  
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] 5,501    
Fair value at ending balance $ 5,485 [3],[5],[27] $ 5,501 [18],[19],[33]  
Interest 5.50% [3],[5],[27] 5.75% [18],[19],[33]  
Interest 10.90% [3],[5],[27] 10.10% [18],[19],[33]  
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 226    
Fair value at ending balance $ 276 [5],[14] $ 226 [19],[20]  
Investment owned, balance (in shares) 210,920.11 [5],[6],[7],[14],[15] 210,920.11 [9],[10],[19],[20]  
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ (21)    
Fair value at ending balance $ (12) [3],[5],[8],[27] $ (21) [18],[19],[33]  
Interest 5.50% [3],[5],[8],[27] 5.75% [18],[19],[33]  
Interest 10.90% [3],[5],[8],[27] 10.10% [18],[19],[33]  
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[32] $ 3,567    
Fair value at ending balance $ 3,454 [2],[3],[5] $ 3,567 [18],[19],[32]  
Interest 5.00% [2],[3],[5] 5.00% [18],[19],[32]  
Interest 10.50% [2],[3],[5] 10.00% [18],[19],[32]  
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[32] $ 743    
Fair value at ending balance $ (47) [2],[3],[5],[8] $ 743 [18],[19],[32]  
Interest 5.00% [2],[3],[5],[8] 5.00% [18],[19],[32]  
Interest 10.50% [2],[3],[5],[8] 10.00% [18],[19],[32]  
Investment, Identifier [Axis]: OG III B.V., Containers & Glass Products, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 3,310    
Fair value at ending balance $ 3,390 [3],[4],[5],[29] $ 3,310 [11],[18],[19],[28]  
Interest 5.75% [3],[4],[5],[29] 5.75% [11],[18],[19],[28]  
Interest 9.70% [3],[4],[5],[29] 7.90% [11],[18],[19],[28]  
Investment, Identifier [Axis]: ORTEC INTERNATIONAL NEWCO B.V. Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[29] $ 985    
Interest [3],[4],[5],[29] 5.75%    
Interest [3],[4],[5],[29] 9.70%    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 2,190    
Fair value at ending balance [17],[18],[19]   $ 2,190  
Interest [17],[18],[19]   6.00%  
Interest [17],[18],[19]   10.20%  
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 12,934    
Interest [2],[3],[5] 6.00%    
Interest [2],[3],[5] 11.50%    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (107)    
Interest [2],[3],[5],[8] 6.00%    
Interest [2],[3],[5],[8] 11.50%    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (22)    
Interest [2],[3],[5],[8] 6.00%    
Interest [2],[3],[5],[8] 11.50%    
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 2,206    
Fair value at ending balance [18],[19],[25]   $ 2,206  
Interest [18],[19],[25]   6.00%  
Interest [18],[19],[25]   10.50%  
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] 221    
Fair value at ending balance $ 174 [5] $ 221 [19],[20]  
Investment owned, balance (in shares) 173,749 [5],[6],[7],[15] 60,040 [9],[10],[19],[20]  
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (6)    
Fair value at ending balance [17],[18],[19]   $ (6)  
Interest [17],[18],[19]   6.00%  
Interest [17],[18],[19]   10.20%  
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 0    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 186.67    
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 2,085    
Investment, interest rate, paid in kind [5] 15.00%    
Investment owned, balance (in shares) [5],[6],[7],[15] 243.81    
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Super Senior Takeback Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 549    
Interest [5] 10.00%    
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Takeback Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 2,933    
Interest [5] 10.00%    
Investment, Identifier [Axis]: Ocular Therapeutix, Inc., Pharma-ceuticals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[27] $ 3,812    
Interest [3],[4],[5],[27] 6.75%    
Interest [3],[4],[5],[27] 12.10%    
Investment, Identifier [Axis]: Offen Inc., Transportation: Cargo, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[33] $ 3,627    
Fair value at ending balance $ 3,691 [5],[12],[26] $ 3,627 [13],[19],[33]  
Interest 5.00% [5],[12],[26] 5.00% [13],[19],[33]  
Interest 10.50% [5],[12],[26] 8.40% [13],[19],[33]  
Investment, Identifier [Axis]: Omni Intermediate Holdings, LLC, Transportation, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 5,995    
Fair value at ending balance $ 7,864 [2],[3],[5] $ 5,995 [18],[19],[25]  
Interest 5.00% [2],[3],[5] 5.00% [18],[19],[25]  
Interest 10.50% [2],[3],[5] 9.70% [18],[19],[25]  
Investment, Identifier [Axis]: Options Technology Ltd., Computer Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[34] $ 2,251    
Fair value at ending balance $ 2,249 [3],[4],[5],[26] $ 2,251 [11],[18],[19],[34]  
Interest 4.75% [3],[4],[5],[26] 4.75% [11],[18],[19],[34]  
Interest 10.20% [3],[4],[5],[26] 9.00% [11],[18],[19],[34]  
Investment, Identifier [Axis]: Oracle Vision Bidco Limited, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] $ 2,753    
Fair value at ending balance $ 2,918 [3],[4],[5],[43] $ 2,753 [11],[18],[19],[42]  
Interest 4.75% [3],[4],[5],[43] 4.75% [11],[18],[19],[42]  
Interest 9.90% [3],[4],[5],[43] 7.70% [11],[18],[19],[42]  
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 342    
Fair value at ending balance $ 326 [3],[4],[5],[29] $ 342 [11],[18],[19],[28]  
Interest 5.25% [3],[4],[5],[29] 5.75% [11],[18],[19],[28]  
Interest 9.20% [3],[4],[5],[29] 7.70% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 577    
Fair value at ending balance $ 531 [2],[3],[4],[5] $ 577 [11],[17],[18],[19]  
Interest 5.25% [2],[3],[4],[5] 5.75% [11],[17],[18],[19]  
Interest 10.70% [2],[3],[4],[5] 10.50% [11],[17],[18],[19]  
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, Class A-2 Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 41    
Fair value at ending balance $ 44 [5] $ 41 [19],[20]  
Investment owned, balance (in shares) 28.8 [5],[6],[7],[15] 28.8 [9],[10],[19],[20]  
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 8,172    
Fair value at ending balance $ 10,319 [2],[3],[5],[8] $ 8,172 [17],[18],[19]  
Interest 5.21% [2],[3],[5],[8] 4.75% [17],[18],[19]  
Interest 10.70% [2],[3],[5],[8] 9.40% [17],[18],[19]  
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 2,930    
Interest [2],[3],[5],[8] 5.75%    
Interest [2],[3],[5],[8] 11.20%    
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 829    
Fair value at ending balance $ 820 [3],[4],[5],[8],[59] $ 829 [11],[18],[19],[28]  
Interest 6.00% [3],[4],[5],[8],[59] 5.25% [11],[18],[19],[28]  
Interest 9.90% [3],[4],[5],[8],[59] 7.30% [11],[18],[19],[28]  
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 842    
Fair value at ending balance $ 1,305 [3],[4],[5],[27] $ 842 [11],[17],[18],[19]  
Interest 6.00% [3],[4],[5],[27] 5.25% [11],[17],[18],[19]  
Interest 11.40% [3],[4],[5],[27] 10.00% [11],[17],[18],[19]  
Investment, Identifier [Axis]: Panoche Energy Center LLC, Electric, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 4,628    
Fair value at ending balance $ 4,224 [5] $ 4,628 [19]  
Interest 6.90% [5] 6.90% [19]  
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), Health Care Equipment, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 2,638    
Fair value at ending balance $ 2,804 [3],[4],[5],[41] $ 2,638 [11],[18],[19],[35]  
Interest 5.25% [3],[4],[5],[41] 5.25%  
Interest 9.20% [3],[4],[5],[41] 7.10%  
Investment, interest rate, paid in kind 0.80% [3],[4],[5],[41] 0.75% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), Health Care Equipment, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] $ 1,455    
Fair value at ending balance $ 1,482 [2],[3],[4],[5] $ 1,455 [11],[18],[19],[25]  
Interest 5.25% [2],[3],[4],[5] 6.50% [11],[18],[19],[25]  
Interest 10.60% [2],[3],[4],[5] 9.60% [11],[18],[19],[25]  
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 605    
Interest [2],[3],[5],[8] 8.30%    
Interest [2],[3],[5],[8] 13.60%    
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 298    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 29,762    
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), Diversified Financial Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 2,702    
Fair value at ending balance $ 2,327 [3],[4],[5],[29] $ 2,702 [11],[18],[19],[28]  
Interest 6.75% [3],[4],[5],[29] 6.75% [11],[18],[19],[28]  
Interest 10.70% [3],[4],[5],[29] 8.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), Diversified Financial Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 3,159    
Fair value at ending balance $ 2,804 [2],[3],[4],[5] $ 3,159 [11],[17],[18],[19]  
Interest 6.75% [2],[3],[4],[5] 6.75% [11],[17],[18],[19]  
Interest 12.30% [2],[3],[4],[5] 11.40% [11],[17],[18],[19]  
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class A      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 165    
Fair value at ending balance $ 172 [4],[5] $ 165 [11],[19]  
Interest 4.70% [4],[5] 4.70% [11],[19]  
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class B      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 162    
Fair value at ending balance $ 173 [4],[5] $ 162 [11],[19]  
Interest 5.40% [4],[5] 5.40% [11],[19]  
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class C      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 157    
Fair value at ending balance $ 167 [4],[5] $ 157 [11],[19]  
Interest 5.90% [4],[5] 5.90% [11],[19]  
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class D      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 158    
Fair value at ending balance $ 166 [4],[5] $ 158 [11],[19]  
Interest 8.50% [4],[5] 8.50% [11],[19]  
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class E      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 8,154    
Fair value at ending balance $ 8,503 [4],[5] $ 8,154 [11],[19]  
Interest 11.40% [4],[5] 11.40% [11],[19]  
Investment, Identifier [Axis]: Permaconn BidCo Pty Ltd, Tele-communications, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[58] $ 2,728    
Fair value at ending balance $ 2,743 [3],[4],[5],[60] $ 2,728 [11],[18],[19],[58]  
Interest 6.25% [3],[4],[5],[60] 6.00% [11],[18],[19],[58]  
Interest 10.70% [3],[4],[5],[60] 9.10% [11],[18],[19],[58]  
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 1,210    
Fair value at ending balance $ 1,118 [2],[3],[5] $ 1,210 [17],[18],[19]  
Interest 4.75% [2],[3],[5] 4.75% [17],[18],[19]  
Interest 10.20% [2],[3],[5] 9.60% [17],[18],[19]  
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 823    
Fair value at ending balance $ 1,285 [5] $ 823 [19],[20]  
Investment owned, balance (in shares) 7,409 [5],[6],[7],[15] 7,408.6 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (9)    
Fair value at ending balance $ 0 [2],[3],[5],[8] $ (9) [17],[18],[19]  
Interest 4.75% [2],[3],[5],[8] 4.75% [17],[18],[19]  
Interest 10.20% [2],[3],[5],[8] 9.60% [17],[18],[19]  
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 48,490    
Fair value at ending balance $ 50,498 [2],[3],[5] $ 48,490 [17],[18],[19]  
Interest 6.00% [2],[3],[5] 6.00% [17],[18],[19]  
Interest 11.60% [2],[3],[5] 8.80% [17],[18],[19]  
Investment, interest rate, paid in kind 4.00% [2],[3],[5] 4.00% [17],[18],[19]  
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class A      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 438    
Fair value at ending balance $ 1,297 [5],[14] $ 438 [19],[20]  
Investment owned, balance (in shares) 2.55830 [5],[6],[7],[14],[15] 2.55830 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class B      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 148    
Fair value at ending balance $ 438 [5],[14] $ 148 [19],[20]  
Investment owned, balance (in shares) 0.86340 [5],[6],[7],[14],[15] 0.86340 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class CC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 0    
Fair value at ending balance $ 0 [5],[14] $ 0 [19],[20]  
Investment owned, balance (in shares) 0.08870 [5],[6],[7],[14],[15] 0.08870 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class D      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 42    
Fair value at ending balance $ 125 [5],[14] $ 42 [19],[20]  
Investment owned, balance (in shares) 0.24710 [5],[6],[7],[14],[15] 0.24710 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, Chemicals, Plastics & Rubber, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 0    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 74    
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[19],[33] $ 987    
Fair value at ending balance $ 936 [3],[5],[12],[27] $ 987 [13],[18],[19],[33]  
Interest 7.00% [3],[5],[12],[27] 7.00% [13],[18],[19],[33]  
Interest 12.40% [3],[5],[12],[27] 11.40% [13],[18],[19],[33]  
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, Research & Consulting Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 12,510    
Fair value at ending balance $ 7,511 [2],[3],[5] $ 12,510 [17],[18],[19]  
Interest 6.75% [2],[3],[5] 6.25% [17],[18],[19]  
Interest 12.50% [2],[3],[5] 9.90% [17],[18],[19]  
Investment, Identifier [Axis]: Premium Invest, Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 5,656    
Fair value at ending balance $ 9,031 [3],[4],[5],[8],[41] $ 5,656 [11],[18],[19],[35]  
Interest 6.50% [3],[4],[5],[8],[41] 5.75% [11],[18],[19],[35]  
Interest 10.50% [3],[4],[5],[8],[41] 8.50% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Preqin MC Limited, Banking, Finance, Insurance & Real Estate, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[34] $ 2,719    
Fair value at ending balance $ 2,778 [3],[4],[5],[26] $ 2,719 [11],[18],[19],[34]  
Interest 5.25% [3],[4],[5],[26] 5.25% [11],[18],[19],[34]  
Interest 11.00% [3],[4],[5],[26] 8.60% [11],[18],[19],[34]  
Investment, Identifier [Axis]: Process Equipment, Inc. (ProcessBarron), Industrial Air & Material Handling Equipment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 4,907    
Fair value at ending balance $ 5,462 [2],[3],[5] $ 4,907 [18],[19],[25]  
Interest 5.25% [2],[3],[5] 5.75% [18],[19],[25]  
Interest 11.00% [2],[3],[5] 10.30% [18],[19],[25]  
Investment, Identifier [Axis]: Process Equipment, Inc. (ProcessBarron), Industrial Air & Material Handling Equipment, First Lien Senior Secured Term Loan1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 304    
Fair value at ending balance [18],[19],[33]   $ 304  
Interest [18],[19],[33]   6.00%  
Interest [18],[19],[33]   10.40%  
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 340    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 281    
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 5,293    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.60%    
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (6)    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.60%    
Investment, Identifier [Axis]: Professional Datasolutions, Inc. (PDI), Application Software, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 1,751    
Fair value at ending balance $ 1,783 [2],[3],[5] $ 1,751 [17],[18],[19]  
Interest 4.50% [2],[3],[5] 4.50% [17],[18],[19]  
Interest 10.10% [2],[3],[5] 8.70% [17],[18],[19]  
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[34] $ 1,624    
Fair value at ending balance $ 1,635 [3],[5],[26] $ 1,624 [18],[19],[34]  
Interest 5.75% [3],[5],[26] 5.75% [18],[19],[34]  
Interest 11.50% [3],[5],[26] 9.60% [18],[19],[34]  
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 172    
Fair value at ending balance $ 220 [5],[14] $ 172 [19],[20]  
Investment owned, balance (in shares) 241,935.48 [5],[6],[7],[14],[15] 241,935.48 [9],[10],[19],[20]  
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[34] $ (7)    
Fair value at ending balance $ 274 [3],[5],[8],[26] $ (7) [18],[19],[34]  
Interest 5.75% [3],[5],[8],[26] 5.75% [18],[19],[34]  
Interest 11.50% [3],[5],[8],[26] 9.60% [18],[19],[34]  
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Second Lien Senior Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 74    
Fair value at ending balance $ 73 [5] $ 74 [19]  
Interest 8.00% [5] 8.00% [19]  
Investment, Identifier [Axis]: Proppants Holding, LLC, Energy: Oil & Gas, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 0    
Fair value at ending balance $ 0 [5],[12] $ 0 [13],[19],[20]  
Investment owned, balance (in shares) 1,668,106 [5],[6],[7],[12],[15] 1,668,106 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 1,365    
Fair value at ending balance $ 1,630 [3],[4],[5],[8],[41] $ 1,365 [11],[18],[19],[35]  
Interest 6.75% [3],[4],[5],[8],[41] 6.00% [11],[18],[19],[35]  
Interest 10.80% [3],[4],[5],[8],[41] 7.70% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Protego Bidco B.V., Aerospace & Defense, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 2,017    
Fair value at ending balance $ 2,110 [3],[4],[5],[41] $ 2,017 [11],[18],[19],[35]  
Interest 6.50% [3],[4],[5],[41] 5.25% [11],[18],[19],[35]  
Interest 10.50% [3],[4],[5],[41] 7.10% [11],[18],[19],[35]  
Investment, Identifier [Axis]: QPE7 SPV1 BidCo Pty Ltd, Consumer Cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[30] $ 1,821    
Fair value at ending balance $ 1,852 [3],[4],[5],[31] $ 1,821 [11],[18],[19],[30]  
Interest 4.50% [3],[4],[5],[31] 5.50% [11],[18],[19],[30]  
Interest 8.80% [3],[4],[5],[31] 8.60% [11],[18],[19],[30]  
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 64    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 303,030    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 592    
Interest [2],[3],[5] 5.75%    
Interest [2],[3],[5] 11.20%    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 159    
Investment, interest rate, paid in kind 10.00%    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 148    
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (2)    
Interest [2],[3],[5],[8] 5.75%    
Interest [2],[3],[5],[8] 11.20%    
Investment, Identifier [Axis]: Questel Unite, Business Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 6,692    
Fair value at ending balance $ 6,732 [2],[3],[4],[5] $ 6,692 [11],[17],[18],[19]  
Interest 6.25% [2],[3],[4],[5] 6.25% [11],[17],[18],[19]  
Interest 11.70% [2],[3],[4],[5] 11.00% [11],[17],[18],[19]  
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 9,873    
Fair value at ending balance $ 6,001 [3],[5],[8],[26] $ 9,873 [18],[19],[25]  
Interest 6.25% [3],[5],[8],[26] 6.25% [18],[19],[25]  
Interest 11.60% [3],[5],[8],[26] 10.80% [18],[19],[25]  
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 403    
Fair value at ending balance $ 80 [3],[5],[8],[26] $ 403 [18],[19],[25]  
Interest 6.25% [3],[5],[8],[26] 6.25% [18],[19],[25]  
Interest 11.60% [3],[5],[8],[26] 10.80% [18],[19],[25]  
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18],[19] $ 12,658    
Fair value at ending balance $ 12,723 [2],[3],[5],[12] $ 12,658 [13],[17],[18],[19]  
Interest 6.75% [2],[3],[5],[12] 6.75% [13],[17],[18],[19]  
Interest 12.00% [2],[3],[5],[12] 11.40% [13],[17],[18],[19]  
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18],[19] $ (25)    
Fair value at ending balance $ 778 [2],[3],[5],[8],[12] $ (25) [13],[17],[18],[19]  
Interest 6.75% [2],[3],[5],[8],[12] 6.75% [13],[17],[18],[19]  
Interest 12.00% [2],[3],[5],[8],[12] 11.40% [13],[17],[18],[19]  
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[40] $ 9,438    
Fair value at ending balance $ 9,498 [3],[5],[29] $ 9,438 [18],[19],[40]  
Interest 5.00% [3],[5],[29] 4.75% [18],[19],[40]  
Interest 8.90% [3],[5],[29] 6.60% [18],[19],[40]  
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 1,274    
Fair value at ending balance $ 1,949 [2],[3],[5] $ 1,274 [17],[18],[19]  
Interest 5.00% [2],[3],[5] 4.75% [17],[18],[19]  
Interest 10.40% [2],[3],[5] 9.50% [17],[18],[19]  
Investment, Identifier [Axis]: RPX Corporation, Research & Consulting Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 7,144    
Fair value at ending balance $ 4,732 [2],[3],[5] $ 7,144 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 5.50% [17],[18],[19]  
Interest 11.00% [2],[3],[5] 9.90% [17],[18],[19]  
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class A Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19] $ 1    
Fair value at ending balance $ 0 [5],[12],[14] $ 1 [13],[19]  
Investment owned, balance (in shares) 145.347 [5],[6],[7],[12],[14],[15] 145.347 [9],[10],[13],[19]  
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class B Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 0    
Fair value at ending balance $ 0 [5],[12],[14] $ 0 [13],[19],[20]  
Investment owned, balance (in shares) 145.347 [5],[6],[7],[12],[14],[15] 145.347 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class C Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 155    
Fair value at ending balance $ 73 [5],[12],[14] $ 155 [13],[19],[20]  
Investment owned, balance (in shares) 7,844.03 [5],[6],[7],[12],[14],[15] 7,844.03 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 0    
Fair value at ending balance $ 0 [5],[12],[14] $ 0 [13],[19],[20]  
Investment owned, balance (in shares) 153 [5],[6],[7],[12],[14],[15] 153 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[19],[36] $ 9,761    
Fair value at ending balance $ 8,717 [2],[3],[5],[12] $ 9,761 [13],[18],[19],[36]  
Interest 7.75% [2],[3],[5],[12] 7.75% [13],[18],[19],[36]  
Interest 13.10% [2],[3],[5],[12] 12.00% [13],[18],[19],[36]  
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[19],[36] $ 1,480    
Fair value at ending balance $ 524 [2],[3],[5],[8],[12] $ 1,480 [13],[18],[19],[36]  
Interest 7.75% [2],[3],[5],[8],[12] 7.75% [13],[18],[19],[36]  
Interest 13.10% [2],[3],[5],[8],[12] 12.00% [13],[18],[19],[36]  
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 12,708    
Fair value at ending balance $ 9,890 [2],[3],[5],[8] $ 12,708 [18],[19],[25]  
Interest 6.50% [2],[3],[5],[8] 6.50% [18],[19],[25]  
Interest 11.90% [2],[3],[5],[8] 10.60% [18],[19],[25]  
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 533    
Fair value at ending balance $ 570 [5],[14] $ 533 [19],[20]  
Investment owned, balance (in shares) 5,333 [5],[6],[7],[14],[15] 5,333 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 238    
Fair value at ending balance $ 505 [2],[3],[5],[8] $ 238 [18],[19],[25]  
Interest 6.50% [2],[3],[5],[8] 6.50% [18],[19],[25]  
Interest 11.90% [2],[3],[5],[8] 10.60% [18],[19],[25]  
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 11,392    
Fair value at ending balance $ 11,442 [2],[3],[5] $ 11,392 [17],[18],[19]  
Interest 6.00% [2],[3],[5] 6.50% [17],[18],[19]  
Interest 11.40% [2],[3],[5] 10.30% [17],[18],[19]  
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, Partnership Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 125    
Fair value at ending balance $ 103 [5],[14] $ 125 [19],[20]  
Investment owned, balance (in shares) 187,235 [5],[6],[7],[14],[15] 187,235 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 4,556    
Fair value at ending balance $ 4,167 [2],[3],[5] $ 4,556 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 5.50% [17],[18],[19]  
Interest 11.00% [2],[3],[5] 10.10% [17],[18],[19]  
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, Partnership Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 152    
Fair value at ending balance $ 67 [5],[14] $ 152 [19],[20]  
Investment owned, balance (in shares) 197,368.42 [5],[6],[7],[14],[15] 197,368.42 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18],[19] $ 4,243    
Fair value at ending balance $ 762 [2],[3],[5],[12] $ 4,243 [13],[17],[18],[19]  
Interest 8.00% [2],[3],[5],[12] 8.00% [13],[17],[18],[19]  
Interest 13.60% [2],[3],[5],[12] 12.40% [13],[17],[18],[19]  
Investment, Identifier [Axis]: Resonetics, LLC, Health Care Equipment, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 3,926    
Fair value at ending balance $ 3,991 [2],[3],[5] $ 3,926 [17],[18],[19]  
Interest 7.00% [2],[3],[5] 7.00% [17],[18],[19]  
Interest 12.60% [2],[3],[5] 11.70% [17],[18],[19]  
Investment, Identifier [Axis]: Reward Gateway (UK) Ltd, Precious Metals & Minerals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] $ 2,840    
Fair value at ending balance [11],[18],[19],[42]   $ 2,840  
Interest [11],[18],[19],[42]   6.25%  
Interest [11],[18],[19],[42]   8.40%  
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Finance Companies, Structured - Junior Note      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[8] 29,586    
Investment, Identifier [Axis]: Riedel Beheer B.V., Food & Beverage, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] 2,162    
Fair value at ending balance $ 2,078 [3],[4],[5],[29] $ 2,162 [11],[18],[19],[28]  
Interest 6.25% [3],[4],[5],[29] 6.25% [11],[18],[19],[28]  
Interest 10.20% [3],[4],[5],[29] 8.50% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Rocade Holdings LLC, Common LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] $ 0    
Gross Additions [21],[22] 0    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] 844    
Fair value at ending balance [21] 844 $ 0  
Amount of Interest or Dividends Credited to Income [21],[24] $ 0    
Investment owned, balance (in shares) 23.8    
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, Common LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 844    
Investment owned, balance (in shares) [5],[6],[7],[14] 23.8    
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, Preferred LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[5],[8] $ 73,113    
Interest [2],[5],[8] 6.00%    
Investment, interest rate, paid in kind [2],[5],[8] 11.30%    
Investment owned, balance (in shares) [2],[5],[6],[7],[8] 67,500    
Investment, Identifier [Axis]: Rocade Holdings LLC, Preferred LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] $ 0    
Gross Additions [21],[22] 73,113    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] 0    
Fair value at ending balance [21] 73,113 0  
Amount of Interest or Dividends Credited to Income [21],[24] $ 5,612    
Interest 6.00%    
Investment, interest rate, paid in kind 11.30%    
Investment owned, balance (in shares) 67,500    
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 1,534    
Investment owned, balance (in shares) [5],[6],[7],[15] 233,871    
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[27] $ 6,422    
Interest [3],[5],[27] 7.50%    
Interest [3],[5],[27] 12.90%    
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ (30)    
Interest [3],[5],[8],[27] 7.50%    
Interest [3],[5],[8],[27] 12.90%    
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 10,808    
Fair value at ending balance $ 7,164 [2],[3],[5],[8] $ 10,808 [18],[19],[25]  
Interest 5.50% [2],[3],[5],[8] 6.00% [18],[19],[25]  
Interest 10.90% [2],[3],[5],[8] 10.40% [18],[19],[25]  
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 377    
Fair value at ending balance $ 388 [2],[3],[5],[8] $ 377 [18],[19],[25]  
Interest 5.50% [2],[3],[5],[8] 6.00% [18],[19],[25]  
Interest 10.90% [2],[3],[5],[8] 10.40% [18],[19],[25]  
Investment, Identifier [Axis]: Ruffalo Noel Levitz, LLC, Media Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 9,238    
Fair value at ending balance $ 9,241 [2],[3],[5] $ 9,238 [17],[18],[19]  
Interest 6.00% [2],[3],[5] 6.00% [17],[18],[19]  
Interest 11.40% [2],[3],[5] 10.70% [17],[18],[19]  
Investment, interest rate, paid in kind [2],[3],[5] 0.50%    
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 13,442    
Interest [2],[3],[5],[8] 6.75%    
Interest [2],[3],[5],[8] 12.10%    
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (19)    
Interest [2],[3],[5],[8] 6.75%    
Interest [2],[3],[5],[8] 12.10%    
Investment, Identifier [Axis]: SISU ACQUISITIONCO., INC., Aerospace & Defense, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 6,376    
Fair value at ending balance $ 6,463 [3],[5],[8],[27] $ 6,376 [17],[18],[19]  
Interest 5.75% [3],[5],[8],[27] 5.50% [17],[18],[19]  
Interest 11.10% [3],[5],[8],[27] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: SMART Financial Operations, LLC, Banking, Finance, Insurance & Real Estate, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 110    
Fair value at ending balance [13],[19],[20]   $ 110  
Investment owned, balance (in shares) [9],[10],[13],[19],[20]   1,000,000  
Investment, Identifier [Axis]: SN BUYER, LLC, Health Care Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 10,951    
Fair value at ending balance $ 10,592 [2],[3],[5] $ 10,951 [17],[18],[19]  
Interest 5.75% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 11.20% [2],[3],[5] 10.00% [17],[18],[19]  
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 22,041    
Fair value at ending balance [18],[19],[25]   $ 22,041  
Interest [18],[19],[25]   6.25%  
Interest [18],[19],[25]   10.40%  
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] 516    
Fair value at ending balance [19],[20]   $ 516  
Investment owned, balance (in shares) [9],[10],[19],[20]   516,399  
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] (50)    
Fair value at ending balance [18],[19],[25]   $ (50)  
Interest [18],[19],[25]   6.25%  
Interest [18],[19],[25]   10.40%  
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] 2,383    
Fair value at ending balance $ 3,416 [3],[4],[5],[8],[39] $ 2,383 [11],[18],[19],[38]  
Interest 6.00% [3],[4],[5],[8],[39] 6.50% [11],[18],[19],[38]  
Interest 11.30% [3],[4],[5],[8],[39] 9.40% [11],[18],[19],[38]  
Investment, Identifier [Axis]: SSCP Spring Bidco 3 Limited, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[43] $ 947    
Interest [3],[4],[5],[43] 6.50%    
Interest [3],[4],[5],[43] 11.70%    
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 11,792    
Fair value at ending balance $ 11,567 [2],[3],[5] $ 11,792 [17],[18],[19]  
Interest 6.00% [2],[3],[5] 6.00% [17],[18],[19]  
Interest 11.50% [2],[3],[5] 11.20% [17],[18],[19]  
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, Preferred Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 460    
Fair value at ending balance $ 468 [5],[14] $ 460 [19],[20]  
Investment owned, balance (in shares) 378.7 [5],[6],[7],[14],[15] 372.1 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 1,939    
Fair value at ending balance $ 2,585 [3],[4],[5],[8],[29] $ 1,939 [11],[18],[19],[35]  
Interest 5.50% [3],[4],[5],[8],[29] 5.50% [11],[18],[19],[35]  
Interest 9.40% [3],[4],[5],[8],[29] 8.20% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[68] $ 3,886    
Fair value at ending balance $ 3,357 [3],[4],[5],[63] $ 3,886 [11],[18],[19],[68]  
Interest 5.50% [3],[4],[5],[63] 5.50% [11],[18],[19],[68]  
Interest 7.20% [3],[4],[5],[63] 5.90% [11],[18],[19],[68]  
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 1,716    
Fair value at ending balance $ 1,759 [2],[3],[5] $ 1,716 [18],[19],[25]  
Interest 5.50% [2],[3],[5] 5.50% [18],[19],[25]  
Interest 10.90% [2],[3],[5] 10.20% [18],[19],[25]  
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ (3)    
Fair value at ending balance $ 48 [2],[3],[5],[8] $ (3) [18],[19],[25]  
Interest 5.50% [2],[3],[5],[8] 5.50% [18],[19],[25]  
Interest 10.90% [2],[3],[5],[8] 10.20% [18],[19],[25]  
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 6,310    
Fair value at ending balance [11],[18],[19],[28]   $ 6,310  
Interest [11],[18],[19],[28]   6.00%  
Interest [11],[18],[19],[28]   8.00%  
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[29] $ 3,480    
Interest [3],[4],[5],[29] 5.75%    
Interest [3],[4],[5],[29] 9.70%    
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[4],[5] $ 437    
Interest [2],[3],[4],[5] 5.75%    
Interest [2],[3],[4],[5] 11.10%    
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ (21)    
Fair value at ending balance $ 410 [2],[3],[4],[5],[8],[29] $ (21) [11],[18],[19],[28]  
Interest 5.75% [2],[3],[4],[5],[8],[29] 6.00% [11],[18],[19],[28]  
Interest 9.70% [2],[3],[4],[5],[8],[29] 8.00% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 0 $ 5,451  
Gross Additions   0  
Gross Reductions   (5,451)  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Investment, interest rate, paid in kind   5.00%  
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan, 2023 Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [48] 0    
Gross Additions [48],[49] 3,840    
Gross Reductions [48],[50] (22)    
Amount of Realized Gain (Loss) [48] 0    
Amount of Unrealized Gain (Loss) [48] 48    
Fair value at ending balance [48] 3,866 $ 0  
Amount of Interest or Dividends Credited to Income [48],[51] $ 168    
Interest 6.00%    
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan, Controlled      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 6,020 [48] 0  
Gross Additions 308 [48],[49] 6,020  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) 0 [48] 0  
Fair value at ending balance [48] 6,328 6,020  
Amount of Interest or Dividends Credited to Income $ 309 [48],[51] $ 294  
Investment, interest rate, paid in kind 5.00% 5.00%  
Investment, Identifier [Axis]: Security Holdings B.V, Common Equity Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 0 $ 24,825  
Gross Additions   0  
Gross Reductions   (24,825)  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   0  
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series A, Controlled      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 575 [48] 0  
Gross Additions 0 [48],[49] 560  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) (264) [48] 15  
Fair value at ending balance [48] 311 575  
Amount of Interest or Dividends Credited to Income $ 0 [48],[51] $ 0  
Investment owned, balance (in shares) 17,100 17,100  
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series B, Controlled      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 53,728 [48] $ 0  
Gross Additions 0 [48],[49] 38,753  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) (24,648) [48] 14,975  
Fair value at ending balance [48] 29,080 53,728  
Amount of Interest or Dividends Credited to Income $ 0 [48],[51] $ 0  
Investment owned, balance (in shares) 1,236 1,236  
Investment, Identifier [Axis]: Security Holdings B.V, Senior Subordinated Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 0 $ 9,525  
Gross Additions   0  
Gross Reductions   (9,525)  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Investment, interest rate, paid in kind   3.10%  
Investment, Identifier [Axis]: Security Holdings B.V, Senior Subordinated Note, Controlled      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 $ 0  
Gross Additions   14,567  
Gross Reductions   (13,754)  
Amount of Realized Gain (Loss)   (813)  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 174  
Investment, interest rate, paid in kind   5.00%  
Investment, Identifier [Axis]: Security Holdings B.V, Senior Subordinated Term Loan, Controlled      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 10,534 [48] $ 0  
Gross Additions 333 [48],[49] 10,534  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) 0 [48] 0  
Fair value at ending balance [48] 10,867 10,534  
Amount of Interest or Dividends Credited to Income $ 379 [48],[51] $ 356  
Investment, interest rate, paid in kind 3.10% 3.10%  
Investment, Identifier [Axis]: Security Holdings B.V, Senior Unsecured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 0 $ 7,307  
Gross Additions   0  
Gross Reductions   (7,307)  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   $ 0  
Investment, interest rate, paid in kind   9.00%  
Investment, Identifier [Axis]: Security Holdings B.V, Senior Unsecured Term Loan, Controlled      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 2,015 [48] $ 0  
Gross Additions 154 [48],[49] 7,795  
Gross Reductions 0 [48],[50] (4,975)  
Amount of Realized Gain (Loss) 0 [48] (988)  
Amount of Unrealized Gain (Loss) 67 [48] 183  
Fair value at ending balance [48] 2,236 2,015  
Amount of Interest or Dividends Credited to Income $ 374 [48],[51] $ 825  
Interest 6.00% 6.00%  
Investment, interest rate, paid in kind 9.00% 9.00%  
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Bridge Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[57] $ 6,020    
Fair value at ending balance $ 6,328 [4],[5],[52],[64] $ 6,020 [11],[19],[57]  
Investment, interest rate, paid in kind 5.00% [4],[5],[8],[52],[64] 5.00% [11],[19],[57]  
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Common Stock Series A      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20],[57] $ 575    
Fair value at ending balance $ 311 [4],[5],[14],[52],[64] $ 575 [11],[19],[20],[57]  
Investment owned, balance (in shares) 17,100 [4],[5],[6],[7],[8],[14],[52],[64] 17,100 [9],[10],[11],[19],[20],[57]  
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Common Stock Series B      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20],[57] $ 53,728    
Fair value at ending balance $ 29,080 [4],[5],[14],[52],[64] $ 53,728 [11],[19],[20],[57]  
Investment owned, balance (in shares) 1,236 [4],[5],[6],[7],[8],[14],[52],[64] 1,236 [9],[10],[11],[19],[20],[57]  
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[8],[52],[64] $ 3,866    
Interest [4],[5],[8],[52],[64] 6.00%    
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[57] $ 10,534    
Fair value at ending balance $ 10,867 [4],[5],[52],[64] $ 10,534 [11],[19],[57]  
Investment, interest rate, paid in kind 3.10% [4],[5],[8],[52],[64] 3.10% [11],[19],[57]  
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Unsecured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[57] $ 2,015    
Fair value at ending balance [11],[19],[57]   $ 2,015  
Interest [11],[19],[57]   6.00%  
Investment, interest rate, paid in kind [11],[19],[57]   9.00%  
Investment, Identifier [Axis]: Security Holdings B.V.,Senior Unsecured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[8],[52],[64] $ 2,236    
Interest [4],[5],[8],[52],[64] 6.00%    
Investment, interest rate, paid in kind [4],[5],[8],[52],[64] 9.00%    
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 348    
Fair value at ending balance $ 2,522 [3],[4],[5],[41] $ 348 [11],[18],[19],[35]  
Interest 6.25% [3],[4],[5],[41] 5.75% [11],[18],[19],[35]  
Interest 10.30% [3],[4],[5],[41] 8.20% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 479    
Fair value at ending balance [11],[18],[19],[35]   $ 479  
Interest [11],[18],[19],[35]   5.75%  
Interest [11],[18],[19],[35]   8.20%  
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 791    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 109,127    
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Super Priority First Out      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18] $ 7,148    
Fair value at ending balance [17],[18]   $ 7,148  
Interest [17],[18]   7.50%  
Interest [17],[18]   12.30%  
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Super Priority Second Out      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18] 1,625    
Fair value at ending balance [17],[18]   $ 1,625  
Interest [17],[18]   7.50%  
Interest [17],[18]   12.30%  
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] 1,200    
Fair value at ending balance [11],[19],[20]   $ 1,200  
Investment owned, balance (in shares) [11],[19],[20]   1,200,000  
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[25] 33,720    
Fair value at ending balance [11],[18],[19],[25]   $ 33,720  
Interest [11],[18],[19],[25]   6.00%  
Interest [11],[18],[19],[25]   10.70%  
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[5],[14] $ 1,548    
Investment owned, balance (in shares) [4],[5],[6],[7],[14] 1,200,000    
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[4],[5] $ 34,019    
Interest [2],[3],[4],[5] 6.00%    
Interest [2],[3],[4],[5] 11.70%    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Joint Venture, 89.01% Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] $ 37,950    
Fair value at ending balance [11],[13]   $ 37,950  
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Joint Venture, Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[12] 39,172    
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 37,950 0  
Gross Additions 0 [22] 85,963  
Gross Reductions (1,780) [23] (35,742)  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) 3,002 (12,271)  
Fair value at ending balance 39,172 37,950  
Amount of Interest or Dividends Credited to Income 5,655 [24] 4,526  
Investment, Identifier [Axis]: Sinari Invest, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[41] $ 1,822    
Interest [3],[4],[5],[8],[41] 6.00%    
Interest [3],[4],[5],[8],[41] 9.90%    
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 288    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 275    
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 9,332    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.60%    
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ (38)    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.60%    
Investment, Identifier [Axis]: Smartling, Inc., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 13,393    
Fair value at ending balance $ 10,466 [3],[5],[27] $ 13,393 [18],[19],[33]  
Interest 4.50% [3],[5],[27] 5.75% [18],[19],[33]  
Interest 9.90% [3],[5],[27] 10.10% [18],[19],[33]  
Investment, Identifier [Axis]: Smartling, Inc., Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ (24)    
Fair value at ending balance $ (12) [3],[5],[8],[27] $ (24) [18],[19],[33]  
Interest 4.50% [3],[5],[8],[27] 5.75% [18],[19],[33]  
Interest 9.90% [3],[5],[8],[27] 10.10% [18],[19],[33]  
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[34] $ 4,196    
Fair value at ending balance $ 4,533 [2],[3],[5] $ 4,196 [18],[19],[34]  
Interest 4.50% [2],[3],[5] 4.50% [18],[19],[34]  
Interest 10.00% [2],[3],[5] 7.90% [18],[19],[34]  
Investment, interest rate, paid in kind [2],[3],[5] 1.00%    
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[34] $ 565    
Fair value at ending balance [18],[19],[34]   $ 565  
Interest [18],[19],[34]   4.50%  
Interest [18],[19],[34]   7.90%  
Investment, Identifier [Axis]: Soho Square III Debtco II SARL, Diversified Capital Markets, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] 5,616    
Fair value at ending balance $ 8,175 [4],[5] $ 5,616 [11],[19]  
Investment, interest rate, paid in kind 9.50% [4],[5] 9.50% [11],[19]  
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 15,140    
Interest [2],[3],[5] 6.25%    
Interest [2],[3],[5] 11.70%    
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 382    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 516,399    
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 615    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.70%    
Investment, Identifier [Axis]: Sound Point CLO XX, Ltd., Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] $ 1,192    
Fair value at ending balance 579 [4],[12],[14] $ 1,192 [11],[13]  
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] 1,621    
Fair value at ending balance $ 1,858 [2],[3],[5],[8] $ 1,621 [18],[19],[25]  
Interest 5.00% [2],[3],[5],[8] 5.00% [18],[19],[25]  
Interest 10.30% [2],[3],[5],[8] 9.60% [18],[19],[25]  
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ (4)    
Fair value at ending balance $ 62 [2],[3],[5],[8] $ (4) [18],[19],[25]  
Interest 5.00% [2],[3],[5],[8] 5.00% [18],[19],[25]  
Interest 10.30% [2],[3],[5],[8] 9.60% [18],[19],[25]  
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 5,754    
Fair value at ending balance $ 11,461 [3],[5],[8],[27] $ 5,754 [18],[19],[36]  
Interest 5.50% [3],[5],[8],[27] 5.50% [18],[19],[36]  
Interest 10.90% [3],[5],[8],[27] 9.70% [18],[19],[36]  
Investment, Identifier [Axis]: Spatial Business Systems LLC, Electric, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ (35)    
Fair value at ending balance $ (21) [3],[5],[8],[27] $ (35) [18],[19],[36]  
Interest 5.50% [3],[5],[8],[27] 5.50% [18],[19],[36]  
Interest 10.90% [3],[5],[8],[27] 9.70% [18],[19],[36]  
Investment, Identifier [Axis]: Springbrook Software (SBRK Intermediate, Inc.), Enterprise Software & Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 20,510    
Fair value at ending balance $ 13,719 [2],[3],[5] $ 20,510 [18],[19],[33]  
Interest 5.75% [2],[3],[5] 5.75% [18],[19],[33]  
Interest 11.00% [2],[3],[5] 10.10% [18],[19],[33]  
Investment, Identifier [Axis]: Springbrook Software (SBRK Intermediate, Inc.), Enterprise Software & Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 2,763    
Fair value at ending balance $ 2,791 [2],[3],[5] $ 2,763 [18],[19],[25]  
Interest 6.50% [2],[3],[5] 6.50% [18],[19],[25]  
Interest 12.00% [2],[3],[5] 11.10% [18],[19],[25]  
Investment, Identifier [Axis]: Starnmeer B.V., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 2,477    
Fair value at ending balance $ 2,490 [3],[4],[5],[26] $ 2,477 [11],[17],[18],[19]  
Interest 6.00% [3],[4],[5],[26] 6.30% [11],[17],[18],[19]  
Interest 11.50% [3],[4],[5],[26] 10.70% [11],[17],[18],[19]  
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 12,860    
Fair value at ending balance $ 12,825 [2],[3],[5] $ 12,860 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 10.90% [2],[3],[5] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (26)    
Fair value at ending balance $ 444 [2],[3],[5],[8] $ (26) [17],[18],[19]  
Interest 5.50% [2],[3],[5],[8] 5.75% [17],[18],[19]  
Interest 10.90% [2],[3],[5],[8] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: Syniverse Holdings, Inc., Technology Distributors, Series A Preferred Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 6,515    
Fair value at ending balance $ 8,788 [5] $ 6,515 [19]  
Investment, interest rate, paid in kind 12.50% [5] 12.50% [19]  
Investment owned, balance (in shares) 7,575,758 [5],[6],[7],[15] 7,575,758 [9],[10],[19]  
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[33] $ 1,812    
Fair value at ending balance $ 1,997 [3],[4],[5],[8],[27] $ 1,812 [11],[18],[19],[33]  
Interest 5.50% [3],[4],[5],[8],[27] 5.75% [11],[18],[19],[33]  
Interest 11.00% [3],[4],[5],[8],[27] 10.10% [11],[18],[19],[33]  
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[33] $ 622    
Fair value at ending balance $ 620 [3],[4],[5],[8],[27] $ 622 [11],[18],[19],[33]  
Interest 5.50% [3],[4],[5],[8],[27] 5.75% [11],[18],[19],[33]  
Interest 11.00% [3],[4],[5],[8],[27] 10.10% [11],[18],[19],[33]  
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 60    
Fair value at ending balance $ 73 [5],[14] $ 60 [19],[20]  
Investment owned, balance (in shares) 1,589 [5],[6],[7],[14],[15] 1,589 [9],[10],[19],[20]  
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Technology, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 2,110    
Fair value at ending balance $ 2,395 [5] $ 2,110 [19]  
Investment, interest rate, paid in kind 7.80% [5] 7.80% [19]  
Investment, Identifier [Axis]: TANQUERAY BIDCO LIMITED, Technology. First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 1,557    
Fair value at ending balance [11],[18],[19],[38]   $ 1,557  
Interest [11],[18],[19],[38]   6.25%  
Interest [11],[18],[19],[38]   8.40%  
Investment, Identifier [Axis]: TSM II Luxco 10 SARL, Chemical & Plastics, Senior Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19] 11,118    
Fair value at ending balance [11],[18],[19]   $ 11,118  
Investment, interest rate, paid in kind [11],[18],[19]   9.30%  
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] 591    
Fair value at ending balance $ 810 [2],[3],[5],[8] $ 591 [18],[19],[25]  
Interest 4.75% [2],[3],[5],[8] 4.75% [18],[19],[25]  
Interest 10.10% [2],[3],[5],[8] 9.20% [18],[19],[25]  
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 584    
Interest [2],[3],[5] 5.00%    
Interest [2],[3],[5] 10.40%    
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 5    
Fair value at ending balance $ 9 [5],[14] $ 5 [19],[20]  
Investment owned, balance (in shares) 4,673 [5],[6],[7],[14],[15] 4,673 [9],[10],[19],[20]  
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ (4)    
Fair value at ending balance $ (10) [2],[3],[5],[8] $ (4) [18],[19],[25]  
Interest 4.75% [2],[3],[5],[8] 4.75% [18],[19],[25]  
Interest 10.10% [2],[3],[5],[8] 9.20% [18],[19],[25]  
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 10,877    
Fair value at ending balance [18],[19],[36]   $ 10,877  
Interest [18],[19],[36]   5.75%  
Interest [18],[19],[36]   10.20%  
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[27] $ 7,915    
Interest [3],[5],[27] 5.75%    
Interest [3],[5],[27] 11.20%    
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ 2,430    
Interest [3],[5],[8],[27] 6.00%    
Interest [3],[5],[8],[27] 11.50%    
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 157    
Fair value at ending balance $ 223 [3],[5],[8],[27] $ 157 [18],[19],[36]  
Interest 5.75% [3],[5],[8],[27] 5.75% [18],[19],[36]  
Interest 11.20% [3],[5],[8],[27] 10.20% [18],[19],[36]  
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Technology. First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[39] $ 1,730    
Interest [3],[4],[5],[8],[39] 5.50%    
Interest [3],[4],[5],[8],[39] 10.70%    
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Partnership Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 420    
Investment owned, balance (in shares) [5],[6],[7],[14],[15] 400,000    
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 590    
Interest [5] 12.00%    
Investment, Identifier [Axis]: Team Car Care, LLC, Automotive, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18],[19] $ 11,970    
Fair value at ending balance $ 10,382 [2],[3],[5],[12] $ 11,970 [13],[17],[18],[19]  
Interest 7.50% [2],[3],[5],[12] 8.00% [13],[17],[18],[19]  
Interest 13.10% [2],[3],[5],[12] 11.80% [13],[17],[18],[19]  
Investment, Identifier [Axis]: Team Services Group, Services: Consumer, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[19],[34] $ 9,345    
Fair value at ending balance $ 9,646 [3],[12],[26] $ 9,345 [13],[18],[19],[34]  
Interest 5.00% [3],[12],[26] 5.00% [13],[18],[19],[34]  
Interest 10.90% [3],[12],[26] 9.90% [13],[18],[19],[34]  
Investment, Identifier [Axis]: Team Services Group, Services: Consumer, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[18],[19],[34] $ 4,700    
Fair value at ending balance $ 4,694 [3],[5],[12],[26] $ 4,700 [13],[18],[19],[34]  
Interest 9.00% [3],[5],[12],[26] 9.00% [13],[18],[19],[34]  
Interest 14.90% [3],[5],[12],[26] 13.90% [13],[18],[19],[34]  
Investment, Identifier [Axis]: Techone B.V., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 3,578    
Fair value at ending balance $ 3,814 [3],[4],[5],[29] $ 3,578 [11],[18],[19],[28]  
Interest 5.50% [3],[4],[5],[29] 5.50% [11],[18],[19],[28]  
Interest 9.30% [3],[4],[5],[29] 7.90% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Techone B.V., Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 281    
Fair value at ending balance $ 201 [3],[4],[5],[8],[29] $ 281 [11],[18],[19],[28]  
Interest 5.50% [3],[4],[5],[8],[29] 5.50% [11],[18],[19],[28]  
Interest 9.30% [3],[4],[5],[8],[29] 7.90% [11],[18],[19],[28]  
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 6,226    
Interest [2],[3],[5] 5.00%    
Interest [2],[3],[5] 10.60%    
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 871    
Fair value at ending balance [17],[18],[19]   $ 871  
Interest [17],[18],[19]   5.00%  
Interest [17],[18],[19]   9.70%  
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 5,368    
Fair value at ending balance [17],[18],[19]   $ 5,368  
Interest [17],[18],[19]   5.00%  
Interest [17],[18],[19]   9.70%  
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] (13)    
Fair value at ending balance $ (6) [2],[3],[5],[8] $ (13) [17],[18],[19]  
Interest 5.00% [2],[3],[5],[8] 5.00% [17],[18],[19]  
Interest 10.60% [2],[3],[5],[8] 9.70% [17],[18],[19]  
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Partnership Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 255    
Fair value at ending balance $ 115 [5],[14] $ 255 [19],[20]  
Investment owned, balance (in shares) 24,358.97 [5],[6],[7],[14],[15] 24,358.97 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 259    
Fair value at ending balance $ 260 [5] $ 259 [19]  
Interest 10.00% [5] 10.00% [19]  
Investment, interest rate, paid in kind 4.00% [5] 4.00% [19]  
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 798    
Fair value at ending balance $ 830 [2],[3],[5],[8] $ 798 [17],[18],[19]  
Interest 4.25% [2],[3],[5],[8] 4.25% [17],[18],[19]  
Interest 9.60% [2],[3],[5],[8] 9.00% [17],[18],[19]  
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (9)    
Fair value at ending balance $ 0 [2],[3],[5],[8] $ (9) [17],[18],[19]  
Interest 4.25% [2],[3],[5],[8] 4.25% [17],[18],[19]  
Interest 9.60% [2],[3],[5],[8] 9.00% [17],[18],[19]  
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[34] $ 3,380    
Fair value at ending balance $ 3,578 [3],[5],[26] $ 3,380 [18],[19],[34]  
Interest 7.75% [3],[5],[26] 7.75% [18],[19],[34]  
Interest 13.20% [3],[5],[26] 12.70% [18],[19],[34]  
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[27] $ 12,680    
Interest [3],[5],[27] 5.75%    
Interest [3],[5],[27] 11.10%    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ 0    
Interest [3],[5],[8],[27] 5.75%    
Interest [3],[5],[8],[27] 11.10%    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 4,882    
Investment, interest rate, paid in kind [5] 12.50%    
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[36] $ 25,979    
Fair value at ending balance [18],[19],[36]   $ 25,979  
Interest [18],[19],[36]   5.75%  
Interest [18],[19],[36]   10.10%  
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] 5,547    
Fair value at ending balance [19]   $ 5,547  
Investment, interest rate, paid in kind [19]   11.00%  
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ 11,317    
Interest [3],[5],[8],[27] 5.75%    
Interest [3],[5],[8],[27] 11.20%    
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 1,578    
Fair value at ending balance [18],[19],[33]   $ 1,578  
Interest [18],[19],[33]   5.50%  
Interest [18],[19],[33]   9.90%  
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] 5,560    
Fair value at ending balance [18],[19],[33]   $ 5,560  
Interest [18],[19],[33]   5.75%  
Interest [18],[19],[33]   10.10%  
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 3      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] 14,178    
Fair value at ending balance [18],[19],[33]   $ 14,178  
Interest [18],[19],[33]   5.75%  
Interest [18],[19],[33]   10.10%  
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Partnership Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] 1,019    
Fair value at ending balance $ 2,152 [5],[14] $ 1,019 [19],[20]  
Investment owned, balance (in shares) 676,880.98 [5],[6],[7],[14],[15] 676,880.98 [9],[10],[19],[20]  
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 12,322    
Fair value at ending balance $ 4,240 [2],[3],[5] $ 12,322 [18],[19],[25]  
Interest 7.50% [2],[3],[5] 7.50% [18],[19],[25]  
Interest 12.80% [2],[3],[5] 12.10% [18],[19],[25]  
Investment, Identifier [Axis]: Thompson Rivers LLC, Investment Funds & Vehicles, 16.0% Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11] $ 30,339    
Fair value at ending balance [11]   $ 30,339  
Investment, Identifier [Axis]: Thompson Rivers LLC, Investment Funds & Vehicles, Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [14] 13,365    
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 30,339 84,438  
Gross Additions 0 [22] 0  
Gross Reductions (17,733) [23] (32,793)  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) 759 (21,306)  
Fair value at ending balance 13,365 30,339  
Amount of Interest or Dividends Credited to Income 0 [24] 9,056  
Investment, Identifier [Axis]: Total Safety U.S. Inc., Diversified Support Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18] 5,801    
Fair value at ending balance $ 5,433 [3],[27] $ 5,801 [17],[18]  
Interest 6.00% [3],[27] 6.00% [17],[18]  
Interest 11.50% [3],[27] 10.70% [17],[18]  
Investment, Identifier [Axis]: Total Safety U.S. Inc., Diversified Support Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 3,561    
Fair value at ending balance $ 3,717 [3],[5],[27] $ 3,561 [17],[18],[19]  
Interest 6.00% [3],[5],[27] 6.00% [17],[18],[19]  
Interest 11.50% [3],[5],[27] 10.70% [17],[18],[19]  
Investment, interest rate, paid in kind 5.00% [3],[5],[27] 5.00% [17],[18],[19]  
Investment, Identifier [Axis]: Trader Corporation, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[69] $ 4,486    
Fair value at ending balance $ 4,617 [3],[4],[5],[70] $ 4,486 [11],[18],[19],[69]  
Interest 6.75% [3],[4],[5],[70] 6.75% [11],[18],[19],[69]  
Interest 12.20% [3],[4],[5],[70] 11.60% [11],[18],[19],[69]  
Investment, Identifier [Axis]: Trader Corporation, Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[69] $ (9)    
Fair value at ending balance $ (6) [3],[4],[5],[8] $ (9) [11],[18],[19],[69]  
Interest 6.75% [3],[4],[5],[8] 6.75% [11],[18],[19],[69]  
Interest 12.20% [3],[4],[5],[8] 11.60% [11],[18],[19],[69]  
Investment, Identifier [Axis]: Transit Technologies LLC, Software, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[34] $ 5,872    
Fair value at ending balance $ 6,035 [2],[3],[5] $ 5,872 [18],[19],[34]  
Interest 4.75% [2],[3],[5] 5.00% [18],[19],[34]  
Interest 10.30% [2],[3],[5] 7.90% [18],[19],[34]  
Investment, Identifier [Axis]: Transportation Insight, LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 11,032    
Fair value at ending balance $ 10,335 [3],[5],[26] $ 11,032 [17],[18],[19]  
Interest 4.50% [3],[5],[26] 4.25% [17],[18],[19]  
Interest 10.00% [3],[5],[26] 8.70% [17],[18],[19]  
Investment, Identifier [Axis]: Trident Maritime Systems, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 14,570    
Fair value at ending balance $ 15,409 [2],[3],[5] $ 14,570 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 4.75% [17],[18],[19]  
Interest 10.90% [2],[3],[5] 9.50% [17],[18],[19]  
Investment, Identifier [Axis]: Trintech, Inc., Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[27] $ 6,790    
Interest [3],[5],[27] 6.50%    
Interest [3],[5],[27] 11.90%    
Investment, Identifier [Axis]: Trintech, Inc., Technology, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ 140    
Interest [3],[5],[8],[27] 6.50%    
Interest [3],[5],[8],[27] 11.90%    
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Automotive Parts & Equipment, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 18,756    
Fair value at ending balance $ 18,967 [2],[3],[5] $ 18,756 [18],[19],[25]  
Interest 6.25% [2],[3],[5] 6.25% [18],[19],[25]  
Interest 11.70% [2],[3],[5] 11.10% [18],[19],[25]  
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 0    
Fair value at ending balance $ 0 [5],[12],[14] $ 0 [13],[19],[20]  
Investment owned, balance (in shares) 2.71 [5],[6],[7],[12],[14],[15] 2.71 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Preferred Unit      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 0    
Fair value at ending balance $ 0 [5],[12],[14] $ 0 [13],[19],[20]  
Investment owned, balance (in shares) 2.8 [5],[6],[7],[12],[14],[15] 2.8 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, Class A LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 512    
Fair value at ending balance [19],[20]   $ 512  
Investment owned, balance (in shares) [9],[10],[19],[20]   440.97  
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, Class A LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5] $ 1,323    
Investment owned, balance (in shares) [5],[6],[7],[15] 440.97    
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 6,739    
Interest [2],[3],[5] 5.25%    
Interest [2],[3],[5] 10.60%    
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[34] $ 3,075    
Fair value at ending balance [18],[19],[34]   $ 3,075  
Interest [18],[19],[34]   4.75%  
Interest [18],[19],[34]   9.90%  
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 3,750    
Fair value at ending balance [17],[18],[19]   $ 3,750  
Interest [17],[18],[19]   5.00%  
Interest [17],[18],[19]   9.60%  
Investment, Identifier [Axis]: Turbo Buyer, Inc., Finance Companies, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] 8,061    
Fair value at ending balance $ 7,939 [2],[3],[5],[8] $ 8,061 [17],[18],[19]  
Interest 6.00% [2],[3],[5],[8] 6.00% [17],[18],[19]  
Interest 11.50% [2],[3],[5],[8] 10.70% [17],[18],[19]  
Investment, Identifier [Axis]: Turnberry Solutions, Inc., Consumer Cyclical, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 4,900    
Fair value at ending balance $ 4,898 [2],[3],[5] $ 4,900 [18],[19],[25]  
Interest 6.00% [2],[3],[5] 6.25% [18],[19],[25]  
Interest 11.40% [2],[3],[5] 9.20% [18],[19],[25]  
Investment, Identifier [Axis]: U.S. Silica Company, Metal & Glass Containers, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[33] $ 1,439    
Fair value at ending balance [11],[18],[33]   $ 1,439  
Interest [11],[18],[33]   4.00%  
Interest [11],[18],[33]   8.40%  
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Financial Other, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[47] $ 1,529    
Interest [3],[4],[5],[8],[47] 5.25%    
Interest [3],[4],[5],[8],[47] 9.30%    
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Financial Other, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[47] $ 0    
Interest [3],[4],[5],[8],[47] 5.25%    
Interest [3],[4],[5],[8],[47] 9.30%    
Investment, Identifier [Axis]: UKFast Leaders Limited, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 9,677    
Fair value at ending balance $ 10,762 [3],[4],[5],[39] $ 9,677 [11],[18],[19],[38]  
Interest 4.50% [3],[4],[5],[39] 7.25% [11],[18],[19],[38]  
Interest 4.50% [3],[4],[5],[39] 10.80% [11],[18],[19],[38]  
Investment, interest rate, paid in kind [3],[4],[5],[39] 3.40%    
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), Legal Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[5],[8],[27] $ 9,883    
Interest [3],[5],[8],[27] 5.75%    
Interest [3],[5],[8],[27] 11.10%    
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), Legal Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 15,390    
Fair value at ending balance [18],[19],[25]   $ 15,390  
Interest [18],[19],[25]   5.75%  
Interest [18],[19],[25]   10.50%  
Investment, Identifier [Axis]: Union Bidco Limited, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] 847    
Fair value at ending balance $ 877 [3],[4],[5],[8],[39] $ 847 [11],[18],[19],[38]  
Interest 6.00% [3],[4],[5],[8],[39] 5.75% [11],[18],[19],[38]  
Interest 11.40% [3],[4],[5],[8],[39] 9.20% [11],[18],[19],[38]  
Investment, Identifier [Axis]: United Therapy Holding III GmbH, Healthcare, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[35] $ 1,180    
Fair value at ending balance $ 1,312 [3],[5],[8],[41] $ 1,180 [11],[18],[19],[35]  
Interest 5.75% [3],[5],[8],[41] 5.50% [11],[18],[19],[35]  
Interest 9.90% [3],[5],[8],[41] 8.30% [11],[18],[19],[35]  
Investment, Identifier [Axis]: Unither (Uniholding), Pharma-ceuticals, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [3],[4],[5],[8],[29] $ 2,037    
Interest [3],[4],[5],[8],[29] 6.25%    
Interest [3],[4],[5],[8],[29] 10.20%    
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[28] $ 1,585    
Fair value at ending balance $ 1,559 [3],[4],[5],[29] $ 1,585 [11],[18],[19],[28]  
Interest 6.65% [3],[4],[5],[29] 6.00% [11],[18],[19],[28]  
Interest 10.10% [3],[4],[5],[29] 8.20% [11],[18],[19],[28]  
Investment, interest rate, paid in kind [3],[4],[5],[29] 1.80%    
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[17],[18],[19] $ 3,483    
Fair value at ending balance $ 3,353 [2],[3],[4],[5] $ 3,483 [11],[17],[18],[19]  
Interest 6.65% [2],[3],[4],[5] 5.25% [11],[17],[18],[19]  
Interest 12.00% [2],[3],[4],[5] 8.90% [11],[17],[18],[19]  
Investment, interest rate, paid in kind [2],[3],[4],[5] 1.80%    
Investment, Identifier [Axis]: VOYA CLO 2015-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] $ 91    
Fair value at ending balance 91 [4],[12] $ 91 [11],[13]  
Investment, Identifier [Axis]: VOYA CLO 2016-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[13] 1,551    
Fair value at ending balance 943 [4],[12] 1,551 [11],[13]  
Investment, Identifier [Axis]: Validity, Inc., IT Consulting & Other Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] 4,673    
Fair value at ending balance $ 4,783 [3],[5],[27] $ 4,673 [18],[19],[33]  
Interest 5.25% [3],[5],[27] 4.75% [18],[19],[33]  
Interest 10.70% [3],[5],[27] 9.10% [18],[19],[33]  
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 2    
Fair value at ending balance $ 2 [5],[12],[14] $ 2 [13],[19],[20]  
Investment owned, balance (in shares) 4,676 [5],[6],[7],[12],[14],[15] 4,676 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Warrants      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] $ 3    
Fair value at ending balance $ 3 [5],[12],[14] $ 3 [13],[19],[20]  
Investment owned, balance (in shares) 5,591 [5],[6],[7],[12],[14],[15] 5,591 [9],[10],[13],[19],[20]  
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[42] $ 3,238    
Fair value at ending balance $ 3,573 [3],[4],[5],[39] $ 3,238 [11],[18],[19],[42]  
Interest 6.50% [3],[4],[5],[39] 6.50% [11],[18],[19],[42]  
Interest 11.40% [3],[4],[5],[39] 7.70% [11],[18],[19],[42]  
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 407    
Fair value at ending balance [11],[18],[19],[38]   $ 407  
Interest [11],[18],[19],[38]   6.50%  
Interest [11],[18],[19],[38]   8.70%  
Investment, Identifier [Axis]: Vision Solutions Inc., Business Equipment & Services, Second Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18] 4,771    
Fair value at ending balance $ 5,908 [2],[3],[12] $ 4,771 [13],[17],[18]  
Interest 7.25% [2],[3],[12] 7.25% [13],[17],[18]  
Interest 12.90% [2],[3],[12] 11.60% [13],[17],[18]  
Investment, Identifier [Axis]: VistaJet Pass Through Trust 2021-1B, Airlines, Structured Secured Note - Class B      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] $ 3,792    
Fair value at ending balance $ 3,262 [5] $ 3,792 [19]  
Interest 6.30% [5] 6.30% [19]  
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 7,645    
Fair value at ending balance $ 7,526 [2],[3],[5],[6],[7] $ 7,645 [17],[18],[19]  
Interest 5.50% [2],[3],[5] 5.50% [17],[18],[19]  
Interest 10.90% [2],[3],[5] 10.20% [17],[18],[19]  
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, Partnership Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 293    
Fair value at ending balance $ 434 [5],[14] $ 293 [19],[20]  
Investment owned, balance (in shares) 16,442.9 [5],[6],[7],[15] 16,442.9 [9],[10],[19],[20]  
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[5] $ 5,785    
Interest [2],[5] 5.25%    
Interest [2],[5] 10.60%    
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 3,302    
Fair value at ending balance [17],[18],[19]   $ 3,302  
Interest [17],[18],[19]   4.75%  
Interest [17],[18],[19]   9.50%  
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC,Insurance, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 2,403    
Interest [2],[3],[5],[8] 6.25%    
Interest [2],[3],[5],[8] 11.70%    
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] $ 13,937    
Fair value at ending balance [18],[19],[25]   $ 13,937  
Interest [18],[19],[25]   6.00%  
Interest [18],[19],[25]   10.60%  
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[25] 1,056    
Fair value at ending balance [18],[19],[25]   $ 1,056  
Interest [18],[19],[25]   6.00%  
Interest [18],[19],[25]   10.60%  
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 12,346    
Interest [2],[3],[5] 5.75%    
Interest [2],[3],[5] 11.10%    
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 466    
Interest [2],[3],[5],[8] 5.75%    
Interest [2],[3],[5],[8] 11.10%    
Investment, Identifier [Axis]: Waccamaw River LLC, Investment Funds & Vehicles, 20% Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11] $ 20,212    
Fair value at ending balance [11]   $ 20,212  
Investment, Identifier [Axis]: Waccamaw River LLC, Investment Funds & Vehicles, Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [4],[14] 15,470    
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 20,212 13,501  
Gross Additions 2,480 [22] 8,800  
Gross Reductions 0 [23] 0  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) (7,222) (2,089)  
Fair value at ending balance 15,470 20,212  
Amount of Interest or Dividends Credited to Income 1,460 [24] 1,850  
Investment, Identifier [Axis]: Walker Edison Furniture Company LLC, Consumer Goods: Durable, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] 0    
Fair value at ending balance [13],[19],[20]   $ 0  
Investment owned, balance (in shares) [9],[10],[13],[19],[20]   2,819.53  
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[12],[14] 0    
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity (1.62% Partnership Interest)      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[19],[20] 0    
Fair value at ending balance [13],[19],[20]   $ 0  
Investment, Identifier [Axis]: Wawona Delaware Holdings, LLC, Beverage & Food, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17] 33    
Fair value at ending balance [13],[17]   $ 33  
Interest [13],[17]   4.75%  
Interest [13],[17]   9.20%  
Investment, Identifier [Axis]: Wheels Up Experience Inc, Transportation Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19] 13,153    
Fair value at ending balance $ 9,884 [5] $ 13,153 [19]  
Interest 12.00% [5] 12.00% [19]  
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5] $ 8,345    
Interest [2],[3],[5] 7.00%    
Interest [2],[3],[5] 12.30%    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, LP Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [5],[14] $ 804    
Investment owned, balance (in shares) [5],[6],[7],[14] 63,087.1    
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[5],[8] $ 67    
Interest [2],[3],[5],[8] 7.00%    
Interest [2],[3],[5],[8] 12.30%    
Investment, Identifier [Axis]: White Bidco Limited, Technology, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance [2],[3],[4],[5],[8] $ 1,687    
Interest [2],[3],[4],[5],[8] 6.00%    
Interest [2],[3],[4],[5],[8] 11.40%    
Investment, Identifier [Axis]: Wok Holdings Inc., Retail, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [13],[17],[18] $ 41    
Fair value at ending balance $ 47 [2],[3],[12] $ 41 [13],[17],[18]  
Interest 6.25% [2],[3],[12] 6.50% [13],[17],[18]  
Interest 11.80% [2],[3],[12] 11.20% [13],[17],[18]  
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 1,012    
Fair value at ending balance $ 1,012 [5],[14] $ 1,012 [19],[20]  
Investment owned, balance (in shares) 1,663.3 [5],[6],[7],[14] 1,663.31 [9],[10],[19],[20]  
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 4,882    
Fair value at ending balance $ 4,946 [2],[3],[5] $ 4,882 [17],[18],[19]  
Interest 5.75% [2],[3],[5] 5.75% [17],[18],[19]  
Interest 11.40% [2],[3],[5] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 1,556    
Fair value at ending balance $ 1,378 [2],[3],[5],[8] $ 1,556 [17],[18],[19]  
Interest 5.75% [2],[3],[5],[8] 5.75% [17],[18],[19]  
Interest 11.40% [2],[3],[5],[8] 10.50% [17],[18],[19]  
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 1      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 8,821    
Fair value at ending balance $ 2,414 [2],[3],[5] $ 8,821 [18],[19],[33]  
Interest 4.50% [2],[3],[5] 4.75% [18],[19],[33]  
Interest 10.10% [2],[3],[5] 9.10% [18],[19],[33]  
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 2,428    
Fair value at ending balance $ 8,760 [2],[3],[5] $ 2,428 [18],[19],[33]  
Interest 4.50% [2],[3],[5] 5.25% [18],[19],[33]  
Interest 10.10% [2],[3],[5] 9.60% [18],[19],[33]  
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Common Stock      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19],[20] $ 549    
Fair value at ending balance $ 582 [4],[5],[14] $ 549 [11],[19],[20]  
Investment owned, balance (in shares) 45,665,825 [4],[5],[6],[7],[14] 45,665,825 [9],[10],[11],[19],[20]  
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[38] $ 5,446    
Fair value at ending balance $ 6,448 [3],[4],[5],[8],[39] $ 5,446 [11],[18],[19],[38]  
Interest 5.25% [3],[4],[5],[8],[39] 5.25% [11],[18],[19],[38]  
Interest 10.40% [3],[4],[5],[8],[39] 8.20% [11],[18],[19],[38]  
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Subordinated Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[19] $ 2,502    
Fair value at ending balance $ 3,241 [4],[5] $ 2,502 [11],[19]  
Investment, interest rate, paid in kind 11.00% [4],[5] 11.00% [11],[19]  
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ 2,628    
Fair value at ending balance $ 6,271 [2],[3],[5],[8] $ 2,628 [17],[18],[19]  
Interest 6.00% [2],[3],[5],[8] 4.75% [17],[18],[19]  
Interest 11.50% [2],[3],[5],[8] 9.50% [17],[18],[19]  
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, LLC Units      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [19],[20] $ 189    
Fair value at ending balance $ 172 [5] $ 189 [19],[20]  
Investment owned, balance (in shares) 152.69 [5],[6],[7] 152.69 [9],[10],[19],[20]  
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [17],[18],[19] $ (12)    
Fair value at ending balance $ (6) [2],[3],[5],[8] $ (12) [17],[18],[19]  
Interest 6.00% [2],[3],[5],[8] 4.75% [17],[18],[19]  
Interest 11.50% [2],[3],[5],[8] 9.50% [17],[18],[19]  
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Services: Business, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [11],[18],[19],[53] $ 5,162    
Fair value at ending balance $ 5,718 [3],[5] $ 5,162 [11],[18],[19],[53]  
Interest 6.00% [3],[5] 6.25% [11],[18],[19],[53]  
Interest 11.40% [3],[5] 9.20% [11],[18],[19],[53]  
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, First Lien Senior Secured Term Loan      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ 3,262    
Fair value at ending balance $ 3,473 [3],[5],[27] $ 3,262 [18],[19],[33]  
Interest 5.00% [3],[5],[27] 5.00% [18],[19],[33]  
Interest 10.50% [3],[5],[27] 9.40% [18],[19],[33]  
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, Revolver      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [18],[19],[33] $ (9)    
Fair value at ending balance $ 0 [3],[5],[8],[27] $ (9) [18],[19],[33]  
Interest 5.00% [3],[5],[27] 5.00% [18],[19],[33]  
Interest 10.50% [3],[5],[27] 9.40% [18],[19],[33]  
1888 Industrial Services, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 1,263    
Fair value at ending balance   $ 1,263  
Celebration Bidco, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance 18,391    
Coastal Marina Holdings, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 32,293    
Fair value at ending balance 34,677 32,293  
Eclipse Business Capital, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 144,884    
Fair value at ending balance 155,889 144,884  
Hylan Datacom And Electrical, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 12,511    
Fair value at ending balance 10,449 12,511  
Jocassee Partners LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 40,088    
Fair value at ending balance 41,053 40,088  
Kemmerer Operations LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 2,746    
Fair value at ending balance   2,746  
Rocade Holdings LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at ending balance 73,957    
Security Holdings B.V.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 72,872    
Fair value at ending balance 52,688 [52] 72,872  
Sierra Senior Loan Strategy JV I, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 37,950    
Fair value at ending balance 39,172 37,950  
Thompson Rivers LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 30,339    
Fair value at ending balance 13,365 30,339  
Waccamaw River, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 20,212    
Fair value at ending balance 15,470 20,212  
Black Angus Steakhouses, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 14,794    
Fair value at ending balance 12,035 [52] 14,794  
MVC Automotive Group GmbH      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 16,824    
Fair value at ending balance 25,192 [52] 16,824  
MVC Private Equity Fund LP      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 1,838    
Fair value at ending balance 1,005 [52] 1,838  
Affiliate investments      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 289,993 288,069  
Gross Additions 165,576 [22] 127,617  
Gross Reductions (60,342) [23] (124,878)  
Amount of Realized Gain (Loss) (64) 101  
Amount of Unrealized Gain (Loss) 7,260 (916)  
Fair value at ending balance 402,423 289,993  
Amount of Interest or Dividends Credited to Income 36,382 [24] 30,005  
Affiliate investments | 1888 Industrial Services, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 1,263 [21] 0  
Gross Additions 55 [21],[22] 1,917  
Gross Reductions (1,197) [21],[23] 0  
Amount of Realized Gain (Loss) (775) [21] 0  
Amount of Unrealized Gain (Loss) 654 [21] (654)  
Fair value at ending balance [21] 0 1,263  
Amount of Interest or Dividends Credited to Income [21],[24] 194    
Affiliate investments | Celebration Bidco, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] 0    
Gross Additions [21],[22] 18,391    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] 0    
Fair value at ending balance [21] 18,391 0  
Amount of Interest or Dividends Credited to Income [21],[24] 0    
Affiliate investments | Coastal Marina Holdings, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] 0    
Gross Additions [21],[22] 35,243    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] (566)    
Fair value at ending balance [21] 34,677 0  
Amount of Interest or Dividends Credited to Income [21],[24] 1,086    
Affiliate investments | Charming Charlie, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 0  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   35  
Affiliate investments | Eclipse Business Capital, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 144,884 [21] 99,224  
Gross Additions 35,561 [21],[22] 8,677  
Gross Reductions (35,530) [21],[23] (1,818)  
Amount of Realized Gain (Loss) 0 [21] 0  
Amount of Unrealized Gain (Loss) 10,974 [21] 38,801  
Fair value at ending balance [21] 155,889 144,884  
Amount of Interest or Dividends Credited to Income 15,253 [21],[24] 12,054  
Affiliate investments | Hylan Datacom And Electrical, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 12,511 [21] 0  
Gross Additions 496 [21],[22] 12,886  
Gross Reductions 0 [21],[23] 0  
Amount of Realized Gain (Loss) 0 [21] 101  
Amount of Unrealized Gain (Loss) (2,558) [21] (476)  
Fair value at ending balance [21] 10,449 12,511  
Amount of Interest or Dividends Credited to Income 1,257 [21],[24] 762  
Affiliate investments | Jocassee Partners LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 40,088 37,601  
Gross Additions 0 [22] 5,000  
Gross Reductions 0 [23] 0  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) 965 (2,513)  
Fair value at ending balance 41,053 40,088  
Amount of Interest or Dividends Credited to Income 5,709 [24] 1,427  
Affiliate investments | JSC Tekers Holdings      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 6,197  
Gross Additions   0  
Gross Reductions   (6,197)  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   0  
Affiliate investments | Kemmerer Operations LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 2,746 [21] 0  
Gross Additions 237 [21],[22] 4,374  
Gross Reductions (4,102) [21],[23] (1,220)  
Amount of Realized Gain (Loss) 711 [21] 0  
Amount of Unrealized Gain (Loss) 408 [21] (408)  
Fair value at ending balance [21] 0 2,746  
Amount of Interest or Dividends Credited to Income 156 [21],[24] 307  
Affiliate investments | Rocade Holdings LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance [21] 0    
Gross Additions [21],[22] 73,113    
Gross Reductions [21],[23] 0    
Amount of Realized Gain (Loss) [21] 0    
Amount of Unrealized Gain (Loss) [21] 844    
Fair value at ending balance [21] 73,957 0  
Amount of Interest or Dividends Credited to Income [21],[24] 5,612    
Affiliate investments | Security Holdings B.V.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 47,108  
Gross Additions   0  
Gross Reductions   (47,108)  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   0  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   0  
Affiliate investments | Sierra Senior Loan Strategy JV I, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 37,950 0  
Gross Additions 0 [22] 85,963  
Gross Reductions (1,780) [23] (35,742)  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) 3,002 (12,271)  
Fair value at ending balance 39,172 37,950  
Amount of Interest or Dividends Credited to Income 5,655 [24] 4,526  
Affiliate investments | Thompson Rivers LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 30,339 84,438  
Gross Additions 0 [22] 0  
Gross Reductions (17,733) [23] (32,793)  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) 759 (21,306)  
Fair value at ending balance 13,365 30,339  
Amount of Interest or Dividends Credited to Income 0 [24] 9,056  
Affiliate investments | Waccamaw River, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 20,212 13,501  
Gross Additions 2,480 [22] 8,800  
Gross Reductions 0 [23] 0  
Amount of Realized Gain (Loss) 0 0  
Amount of Unrealized Gain (Loss) (7,222) (2,089)  
Fair value at ending balance 15,470 20,212  
Amount of Interest or Dividends Credited to Income 1,460 [24] 1,850  
Affiliate investments | 1888 Industrial Services, LL, Netting      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Amount of Interest or Dividends Credited to Income   (12)  
Control investments      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 106,328 22,412  
Gross Additions 8,578 [49] 99,701  
Gross Reductions (986) [50] (24,561)  
Amount of Realized Gain (Loss) 0 (722)  
Amount of Unrealized Gain (Loss) (23,000) 9,498  
Fair value at ending balance 90,920 [52] 106,328  
Amount of Interest or Dividends Credited to Income 3,313 [51] 1,797  
Control investments | JSC Tekers Holdings      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 0 0  
Gross Additions   6,197  
Gross Reductions   (5,832)  
Amount of Realized Gain (Loss)   1,079  
Amount of Unrealized Gain (Loss)   (1,444)  
Fair value at ending balance   0  
Amount of Interest or Dividends Credited to Income   0  
Control investments | Security Holdings B.V.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 72,872 [48] 0  
Gross Additions 4,635 [48],[49] 78,229  
Gross Reductions (22) [48],[50] (18,729)  
Amount of Realized Gain (Loss) 0 [48] (1,801)  
Amount of Unrealized Gain (Loss) (24,797) [48] 15,173  
Fair value at ending balance [48] 52,688 72,872  
Amount of Interest or Dividends Credited to Income 1,230 [48],[51] 1,649  
Control investments | Black Angus Steakhouses, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 14,794 [48] 0  
Gross Additions 1,330 [48],[49] 15,275  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) (4,089) [48] (481)  
Fair value at ending balance [48] 12,035 14,794  
Amount of Interest or Dividends Credited to Income 1,401 [48],[51] 544  
Control investments | MVC Automotive Group GmbH      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 16,824 [48] 14,848  
Gross Additions 2,613 [48],[49] 0  
Gross Reductions 0 [48],[50] 0  
Amount of Realized Gain (Loss) 0 [48] 0  
Amount of Unrealized Gain (Loss) 5,755 [48] 1,976  
Fair value at ending balance [48] 25,192 16,824  
Amount of Interest or Dividends Credited to Income 587 [48],[51] 435  
Control investments | MVC Private Equity Fund LP      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance 1,838    
Gross Additions [49] 0    
Gross Reductions [50] (964)    
Amount of Realized Gain (Loss) 0    
Amount of Unrealized Gain (Loss) 131    
Fair value at ending balance 1,005 1,838  
Amount of Interest or Dividends Credited to Income [51] 95    
Control investments | MVC Private Equity Fund LP, Netting      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Fair value at beginning balance $ 1,838 7,564  
Gross Additions   0  
Gross Reductions   0  
Amount of Realized Gain (Loss)   0  
Amount of Unrealized Gain (Loss)   (5,726)  
Fair value at ending balance   1,838  
Amount of Interest or Dividends Credited to Income   $ (831)  
[1] Fair value as a percentage of net assets.
[2] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2023 was 5.33140%.
[3] Debt investment includes interest rate floor feature.
[4] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 28.8% of total investments at fair value as of December 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).
[5] The fair value of the investment was determined using significant unobservable inputs.
[6] All debt investments are income producing, unless otherwise noted. The Company’s external investment adviser, Barings, determines in good faith the fair value of the Company’s investments in accordance with a valuation policy and processes established by the Adviser, which have been approved by the Company’s board of directors (the “Board”), and the Investment Company Act of 1940, as amended (the “1940 Act”). In addition, all debt investments are variable rate investments unless otherwise noted. Index-based floating interest rates are generally subject to a contractual minimum interest rate. Variable rate loans to the Company’s portfolio companies bear interest at a rate that may be determined by reference to the Secured Overnight Financing Rate (“SOFR”), the Euro Interbank Offered Rate (“EURIBOR”), the Bank Bill Swap Bid Rate (“BBSY”), the Stockholm Interbank Offered Rate (“STIBOR”), the Canadian Dollar Offered Rate (“CDOR”), the Sterling Overnight Index Average (“SONIA”), the Swiss Average Rate Overnight (“SARON”), the Norwegian Interbank Offered Rate (“NIBOR”), the Bank Bill Market rate (“BKBM”) or an alternate base rate (commonly based on the Federal Funds Rate or the Prime Rate), at the borrower’s option, which reset annually, semi-annually, quarterly or monthly. For each such loan, the Company has provided the interest rate in effect on the date presented. SOFR-based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread. The borrower may also elect to have multiple interest reset periods for each loan.
[7] All of the Company’s portfolio company investments (including joint venture investments), which as of December 31, 2023 represented 208.0% 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.
[8] Position or portion thereof is an unfunded loan or equity commitment.
[9] All debt investments are income producing, unless otherwise noted. The Adviser 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 Board, and 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 LIBOR, SOFR, EURIBOR, BBSY, STIBOR, CDOR, SONIA, SARON, NIBOR, 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.
[10] All of the Company’s portfolio company investments (including joint venture investments), which as of December 31, 2022 represented 205.4% of the Company’s net assets, are subject to legal restrictions on sales. The acquisition date represents the date of the Company's initial investment in the relevant portfolio company.
[11] 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).
[12] 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.
[13] Investment was purchased as part of the Sierra Merger and is part of the Sierra Reference Portfolio for purposes of the Sierra Credit Support Agreement.
[14] Investment is non-income producing.
[15] A summary of the composition of the Company’s investment portfolio at cost and fair value, and as a percentage of total investments and net assets are as follows:
($ in thousands)CostPercent of
Total
Portfolio
Fair ValuePercent of
Total
Portfolio
Percent of
Total
Net Assets
December 31, 2023:
Senior debt and 1st lien notes
$1,705,353 67 %$1,670,300 67 %140 %
Subordinated debt and 2nd lien notes
256,850 10 238,215 10 20 
Structured products107,314 93,038 
Equity shares320,335 13 374,704 15 31 
Equity warrants76 — 2,392 — — 
Investments in joint ventures / PE fund145,648 110,066 
$2,535,576 100 %$2,488,715 100 %208 %
[16] Non-accrual investment.
[17] The interest rate on these loans is subject to 3 Month LIBOR, which as of December 31, 2022 was 4.76729%.
[18] Debt investment includes interest rate floor feature.
[19] The fair value of the investment was determined using significant unobservable inputs.
[20] Investment is non-income producing.
[21] The fair value of the investment was determined using significant unobservable inputs.
[22]     Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
[23] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[24] Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Affiliate category.
[25] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2022 was 4.58745%.
[26] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2023 was 5.15772%.
[27] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2023 was 5.35472%.
[28] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2022 was 2.13200%.
[29] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2023 was 3.90900%.
[30] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2022 was 3.01500%.
[31] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2023 was 4.31000%.
[32] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2022 was 4.78131%.
[33] The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.
[34] The interest rate on these loans is subject to 6 Month LIBOR, which as of December 31, 2022 was 5.13886%.
[35] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2023 was 2.69300%.
[36] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2022 was 4.35806%.
[37] Non-accrual investment.
[38] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2022 was 3.75470%.
[39] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2023 was 5.20530%.
[40] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2022 was 1.88400%.
[41] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2023 was 3.86100%.
[42] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2022 was 4.09490%.
[43] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2023 was 5.13220%.
[44] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2022 was 3.76500%.
[45] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2023 was 4.44500%.
[46] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2022 was 2.70100%.
[47] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2023 was 4.05200%.
[48] The fair value of the investment was determined using significant unobservable inputs.
[49] Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
[50] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[51] Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.
[52] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” and “control” the portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the year ended December 31, 2023 in which the portfolio company is deemed to be a “Control Investment” of the Company were as follows:
December 31, 2022
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)December 31, 2023
Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Black Angus Steakhouses, LLC(d)
First Lien Senior Secured Term Loan (14.4% PIK)
$5,647 $1,330 $— $— $189 $7,166 $1,401 
First Lien Senior Secured Term Loan (10.0% PIK)(e)
9,147 — — — (4,278)4,869 — 
LLC Units (44.6 units)
— — — — — — — 
14,794 1,330 — — (4,089)12,035 1,401 
MVC Automotive Group GmbH(d)
Bridge Loan (4.5% Cash, 1.5% PIK)
7,149 2,613 — — — 9,762 587 
Common Equity Interest (18,000 Shares)
9,675 — — — 5,755 15,430 — 
16,824 2,613 — — 5,755 25,192 587 
MVC Private Equity Fund LP
General Partnership Interest
(1,831.4 units)
45 — (24)— 24 95 
Limited Partnership Interest
(71,790.4 units)
1,793 — (940)— 128 981 — 
1,838 — (964)— 131 1,005 95 
Security Holdings B.V(d)
Bridge Loan (5.0% PIK,)
6,020 308 — — — 6,328 309 
2023 Revolver (6.0% Cash)
— 3,840 (22)— 48 3,866 168 
Senior Subordinated Term Loan (3.1% PIK)
10,534 333 — — — 10,867 379 
Senior Unsecured Term Loan (6.0% Cash, 9.0% PIK)
2,015 154 — — 67 2,236 374 
Common Stock Series A (17,100 shares)
575 — — — (264)311 — 
Common Stock Series B (1,236 shares)
53,728 — — — (24,648)29,080 — 
72,872 4,635 (22)— (24,797)52,688 1,230 
Total Control Investments$106,328 $8,578 $(986)$ $(23,000)$90,920 $3,313 
(a) Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)     Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c)    Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.
[53] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2022 was 3.43570%.
[54] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2023 was 5.19920%.
[55] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2022 was 4.93500%.
[56] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2023 was 5.44750%.
[57] 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.
[58] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2022 was 3.26470%.
[59] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2023 was 3.84500%.
[60] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2023 was 4.35750%.
[61] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2022 was 4.53000%.
[62] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2023 was 5.63000%.
[63] The interest rate on these loans is subject to 6 Month SARON, which as of December 31, 2023 was 1.69524%.
[64] 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.
[65] The interest rate on these loans is subject to Prime, which as of December 31, 2022 was 7.50000%.
[66] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2022 was 3.04000%.
[67] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2023 was 4.59000%.
[68] The interest rate on these loans is subject to 3 Month SARON, which as of December 31, 2022 was 0.94212%.
[69] The interest rate on these loans is subject to 1 Month CDOR, which as of December 31, 2022 was 4.73750%.
[70] The interest rate on these loans is subject to 1 Month CDOR, which as of December 31, 2023 was 5.45500%.