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Unaudited Consolidated Schedule of Investments - Schedule Of Investments (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 2,448,935  
Fair value at ending balance $ 2,556,114 $ 2,448,935
Interest [1],[2],[3]   4.50%
Interest [1],[2],[3]   8.80%
Investment, interest rate, paid in kind [4],[5],[6] 1.50%  
Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 9.10% [7],[8],[9] 9.10% [10],[11],[12]
Sierra Senior Loan Strategy JV I, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 89.01% [7],[8],[9],[13] 89.01% [10],[11],[12],[14]
Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 16.00% [8],[9],[15] 16.00% [11],[12]
Waccamaw River, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 20.00% [7],[8],[9] 20.00% [10],[11],[12]
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 [1],[2],[14],[16],[17] $ 0  
Fair value at ending balance $ 0 [4],[5],[13],[18],[19] $ 0 [1],[2],[14],[16],[17]
Interest 5.00% [4],[5],[13],[18],[19] 5.00% [1],[2],[14],[16],[17]
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 [1],[2],[14],[16],[17] $ 1,263  
Fair value at ending balance $ 1,104 [4],[5],[13],[18],[19] $ 1,263 [1],[2],[14],[16],[17]
Interest 5.00% [4],[5],[13],[18],[19] 5.00% [1],[2],[14],[16],[17]
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 [2],[14],[20] $ 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14],[20]
Investment owned, balance (in shares) 7,546.76 [5],[8],[9],[13],[15] 7,546.76 [2],[11],[12],[14],[20]
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 $ 0
Gross Additions 0 419
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 (419)
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income $ 31 $ 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 $ 0
Gross Additions 0 1,498
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (159) (235)
Fair value at ending balance 1,104 1,263
Amount of Interest or Dividends Credited to Income $ 99 $ (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 $ 0
Gross Additions 0 0
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 0
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income $ 0 $ 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 [1],[2],[21] $ 16,307  
Fair value at ending balance $ 16,225 [4],[5],[6] $ 16,307 [1],[2],[21]
Interest 5.00% [4],[5],[6] 4.75% [1],[2],[21]
Interest 9.80% [4],[5],[6] 8.80% [1],[2],[21]
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 [2],[10] $ 12,500  
Fair value at ending balance $ 12,500 [5],[7] $ 12,500 [2],[10]
Interest 14.30% [5],[7] 14.30% [2],[10]
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 [4],[5],[7],[19] $ 4,180  
Fair value at ending balance [4],[5],[7],[19] $ 4,721 $ 4,180
Interest [4],[5],[7],[19] 9.25% 9.25%
Interest [4],[5],[7],[19] 14.20% 14.00%
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 [2],[20] $ 798  
Fair value at ending balance $ 557 [5],[15] $ 798 [2],[20]
Investment owned, balance (in shares) 348.68 [5],[8],[9],[15] 348.68 [2],[11],[12],[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 [1],[2],[17] $ 6,215  
Fair value at ending balance $ 6,260 [4],[5],[19] $ 6,215 [1],[2],[17]
Interest 7.50% [4],[5],[19] 7.50% [1],[2],[17]
Interest 12.70% [4],[5],[19] 12.20% [1],[2],[17]
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 [10],[14] $ 3,190  
Fair value at ending balance 2,976 [7],[13] $ 3,190 [10],[14]
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 [10],[14] 1,423  
Fair value at ending balance 1,210 [7],[13] 1,423 [10],[14]
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 [1],[2],[10],[22] 2,044  
Fair value at ending balance $ 2,446 [4],[5],[7],[23] $ 2,044 [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[23] 6.00% [1],[2],[10],[22]
Interest 9.00% [4],[5],[7],[23] 8.20% [1],[2],[10],[22]
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 [1],[2],[10],[24] $ 2,073  
Fair value at ending balance $ 2,020 [4],[5],[7],[25] $ 2,073 [1],[2],[10],[24]
Interest 7.25% [4],[5],[7],[25] 7.25% [1],[2],[10],[24]
Interest 10.90% [4],[5],[7],[25] 10.30% [1],[2],[10],[24]
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 [1],[2],[17] $ 19,140  
Fair value at ending balance $ 19,400 [4],[5],[19] $ 19,140 [1],[2],[17]
Interest 7.50% [4],[5],[19] 7.50% [1],[2],[17]
Interest 12.50% [4],[5],[19] 12.20% [1],[2],[17]
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 [2],[20] $ 620  
Fair value at ending balance $ 686 [5] $ 620 [2],[20]
Investment owned, balance (in shares) 25,718.2 [5],[8],[9] 25,718.2 [2],[11],[12],[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 [1],[2],[26] $ 20,920  
Fair value at ending balance $ 20,141 [4],[5],[27] $ 20,920 [1],[2],[26]
Interest 5.00% [4],[5],[27] 5.00% [1],[2],[26]
Interest 9.90% [4],[5],[27] 9.30% [1],[2],[26]
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 [1],[2],[17] $ 8,367  
Fair value at ending balance $ 8,322 [4],[5],[27] $ 8,367 [1],[2],[17]
Interest 4.25% [4],[5],[27] 4.25% [1],[2],[17]
Interest 9.20% [4],[5],[27] 9.00% [1],[2],[17]
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 [1],[2],[28] $ 8,125  
Fair value at ending balance $ 8,146 [4],[5],[29] $ 8,125 [1],[2],[28]
Interest 5.50% [4],[5],[29] 6.00% [1],[2],[28]
Interest 9.90% [4],[5],[29] 10.40% [1],[2],[28]
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 [1],[2],[28] $ (42)  
Fair value at ending balance $ (33) [4],[5],[29] $ (42) [1],[2],[28]
Interest 5.50% [4],[5],[29] 6.00% [1],[2],[28]
Interest 9.90% [4],[5],[29] 10.40% [1],[2],[28]
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 [1],[3] $ 4,416  
Fair value at ending balance $ 4,615 [4],[19] $ 4,416 [1],[3]
Interest 3.25% [4],[19] 3.25% [1],[3]
Interest 8.00% [4],[19] 7.70% [1],[3]
Investment, interest rate, paid in kind 0.30% [4],[19] 0.30% [1],[3]
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 [1],[3] $ 685  
Fair value at ending balance $ 724 [4],[30] $ 685 [1],[3]
Interest 4.50% [4],[30] 4.50% [1],[3]
Interest 9.30% [4],[30] 8.70% [1],[3]
Investment, interest rate, paid in kind 1.00% [4],[30] 1.00% [1],[3]
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 $ 6,040 $ 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 [2],[20] $ 5,403  
Fair value at ending balance $ 5,523 [5],[15] $ 5,403 [2],[20]
Investment owned, balance (in shares) 5,000 [5],[8],[9],[15] 5,000 [2],[11],[12],[20]
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 beginning balance [2],[20] $ 1,667  
Fair value at ending balance $ 1,735 [5],[15] $ 1,667 [2],[20]
Investment owned, balance (in shares) 1,667 [5],[8],[9],[15] 1,667 [2],[11],[12],[20]
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 [1],[2],[17] $ 7,480  
Fair value at ending balance [1],[2],[17]   $ 7,480
Interest [1],[2],[17]   4.50%
Interest [1],[2],[17]   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 [1],[2],[10],[31] 2,436  
Fair value at ending balance [31] $ 2,442 [4],[5],[7] $ 2,436 [1],[2],[10]
Interest [31] 6.75% [4],[5],[7] 6.50% [1],[2],[10]
Interest [31] 11.60% [4],[5],[7] 9.60% [1],[2],[10]
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 [2],[20] $ 436  
Fair value at ending balance $ 328 [5],[15] $ 436 [2],[20]
Investment owned, balance (in shares) 437,623.3 [5],[8],[9],[15] 437,623.3 [2],[11],[12],[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 [1],[2],[17] $ 12,069  
Fair value at ending balance $ 11,711 [4],[5],[19] $ 12,069 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.80% [4],[5],[19] 10.80% [1],[2],[17]
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 [1],[2],[17] $ 1,116  
Fair value at ending balance $ 1,286 [4],[5],[30] $ 1,116 [1],[2],[17]
Interest 5.75% [4],[5],[30] 5.75% [1],[2],[17]
Interest 10.50% [4],[5],[30] 10.80% [1],[2],[17]
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 [1],[2],[10],[32] $ 7,276  
Fair value at ending balance $ 7,250 [4],[5],[7],[33] $ 7,276 [1],[2],[10],[32]
Interest 4.75% [4],[5],[7],[33] 6.25% [1],[2],[10],[32]
Interest 7.50% [4],[5],[7],[33] 6.80% [1],[2],[10],[32]
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 [2],[20] $ 671  
Fair value at ending balance $ 671 [5],[15] $ 671 [2],[20]
Investment owned, balance (in shares) 8,717.76 [5],[8],[9],[15] 8,717.76 [2],[11],[12],[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 [2],[20] $ 173  
Fair value at ending balance $ 173 [5],[15] $ 173 [2],[20]
Investment owned, balance (in shares) 2,248.46 [5],[8],[9],[15] 2,248.46 [2],[11],[12],[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 [2],[20] $ 0  
Fair value at ending balance $ 0 [5],[15] $ 0 [2],[20]
Investment owned, balance (in shares) 8,717.76 [5],[8],[9],[15] 8,717.76 [2],[11],[12],[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 [2],[20] $ 0  
Fair value at ending balance $ 0 [5],[15] $ 0 [2],[20]
Investment owned, balance (in shares) 2,248.46 [5],[8],[9],[15] 2,248.46 [2],[11],[12],[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 $ 4,920 $ 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 [1],[2],[17] $ 12,722  
Fair value at ending balance $ 12,711 [4],[5],[31] $ 12,722 [1],[2],[17]
Interest 5.50% [4],[5],[31] 5.50% [1],[2],[17]
Interest 10.50% [4],[5],[31] 10.20% [1],[2],[17]
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 [4],[5],[7],[23] $ 2,901  
Interest [4],[5],[7],[23] 6.25%  
Interest [4],[5],[7],[23] 9.30%  
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 [1],[2],[14],[26] $ 22,677  
Fair value at ending balance $ 22,677 [4],[5],[13],[27] $ 22,677 [1],[2],[14],[26]
Interest 6.00% [4],[5],[13],[27] 6.00% [1],[2],[14],[26]
Interest 10.80% [4],[5],[13],[27] 10.40% [1],[2],[14],[26]
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 [1],[3] $ 16,704  
Fair value at ending balance $ 16,704 [4],[30] $ 16,704 [1],[3]
Interest 9.00% [4],[30] 9.00% [1],[3]
Interest 13.70% [4],[30] 13.30% [1],[3]
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 [2],[10],[20] $ 1,121  
Fair value at ending balance $ 1,152 [5],[7],[15] $ 1,121 [2],[10],[20]
Investment owned, balance (in shares) 93,165,208 [5],[7],[8],[9],[15] 93,165,208 [2],[10],[11],[12],[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 [2],[10],[17] $ 4,303  
Fair value at ending balance $ 4,322 [5],[7],[19] $ 4,303 [2],[10],[17]
Interest 2.00% [5],[7],[19] 2.00% [2],[10],[17]
Interest 7.00% [5],[7],[19] 6.80% [2],[10],[17]
Investment, interest rate, paid in kind 9.00% [5],[7],[19] 9.00% [2],[10],[17]
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrant    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[10],[20] $ 426  
Fair value at ending balance $ 621 [5],[7],[15] $ 426 [2],[10],[20]
Investment owned, balance (in shares) 380,385 [5],[7],[8],[9],[15] 380,385 [2],[10],[11],[12],[20]
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 [1],[2],[3] $ 2,222  
Fair value at ending balance $ 2,222 [4],[5],[30] $ 2,222 [1],[2],[3]
Interest 5.25% [4],[5],[30] 5.50% [1],[2],[3]
Interest 9.90% [4],[5],[30] 9.60% [1],[2],[3]
Investment, Identifier [Axis]: Amtech LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3] $ 128  
Fair value at ending balance $ (7) [4],[5],[30] $ 128 [1],[2],[3]
Interest 5.25% [4],[5],[30] 5.50% [1],[2],[3]
Interest 9.90% [4],[5],[30] 9.60% [1],[2],[3]
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 $ 15,037 $ 14,368
Interest 10.00% 10.00%
Investment, interest rate, paid in kind 5.00% 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 [1],[2],[10],[22] $ 2,330  
Fair value at ending balance $ 3,060 [4],[5],[7],[23] $ 2,330 [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[23] 6.00% [1],[2],[10],[22]
Interest 8.20% [4],[5],[7],[23] 7.70% [1],[2],[10],[22]
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 [1],[2],[10],[22] $ 723  
Fair value at ending balance $ 5,637 [4],[5],[7],[23] $ 723 [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[23] 6.00% [1],[2],[10],[22]
Interest 8.20% [4],[5],[7],[23] 7.70% [1],[2],[10],[22]
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 [1],[2],[10],[22] $ 5,623  
Fair value at ending balance $ 1,617 [4],[5],[7],[23] $ 5,623 [1],[2],[10],[22]
Interest 7.00% [4],[5],[7],[23] 6.00% [1],[2],[10],[22]
Interest 9.20% [4],[5],[7],[23] 7.70% [1],[2],[10],[22]
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 [1],[2],[10],[17] $ 997  
Fair value at ending balance $ 982 [4],[5],[7],[19] $ 997 [1],[2],[10],[17]
Interest 6.00% [4],[5],[7],[19] 6.00% [1],[2],[10],[17]
Interest 10.90% [4],[5],[7],[19] 10.80% [1],[2],[10],[17]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[10],[22] $ (8)  
Fair value at ending balance $ (13) [4],[5],[7],[23] $ (8) [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[23] 6.00% [1],[2],[10],[22]
Interest 8.20% [4],[5],[7],[23] 7.70% [1],[2],[10],[22]
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 [1],[2],[3] $ 11,006  
Fair value at ending balance $ 10,884 [4],[5],[30] $ 11,006 [1],[2],[3]
Interest 7.25% [4],[5],[30] 7.25% [1],[2],[3]
Interest 12.10% [4],[5],[30] 11.60% [1],[2],[3]
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 [1],[2],[10],[34] $ 1,753  
Fair value at ending balance $ 1,802 [4],[5],[7],[35] $ 1,753 [1],[2],[10],[34]
Interest 6.25% [4],[5],[7],[35] 6.25% [1],[2],[10],[34]
Interest 10.00% [4],[5],[7],[35] 9.70% [1],[2],[10],[34]
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 [2],[10] $ 266  
Fair value at ending balance $ 264 [5],[7] $ 266 [2],[10]
Investment, interest rate, paid in kind 8.00% [5],[7] 8.00% [2],[10]
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 [10],[14] $ 6,635  
Fair value at ending balance 6,035 [7],[13] $ 6,635 [10],[14]
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 [2],[10],[20] 6  
Fair value at ending balance $ 0 [5],[7],[15] $ 6 [2],[10],[20]
Investment owned, balance (in shares) 48 [5],[7],[8],[9],[15] 48 [2],[10],[11],[12],[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 [1],[2],[10],[36] $ 5,085  
Fair value at ending balance $ 2,104 [4],[5],[7],[33] $ 5,085 [1],[2],[10],[36]
Interest 6.50% [4],[5],[7],[33] 7.00% [1],[2],[10],[36]
Interest 9.30% [4],[5],[7],[33] 8.90% [1],[2],[10],[36]
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 [2],[10],[20] $ 110  
Fair value at ending balance $ 21 [5],[7],[15] $ 110 [2],[10],[20]
Investment owned, balance (in shares) 13 [5],[7],[8],[9],[15] 13 [2],[10],[11],[12],[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 [1],[2],[10],[37] $ 3,344  
Fair value at ending balance $ 3,480 [4],[5],[7],[38] $ 3,344 [1],[2],[10],[37]
Interest 5.50% [4],[5],[7],[38] 5.50% [1],[2],[10],[37]
Interest 9.70% [4],[5],[7],[38] 7.20% [1],[2],[10],[37]
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 [1],[2],[10],[37] $ 5,263  
Fair value at ending balance $ 5,923 [4],[5],[7],[38] $ 5,263 [1],[2],[10],[37]
Interest 6.00% [4],[5],[7],[38] 6.00% [1],[2],[10],[37]
Interest 8.90% [4],[5],[7],[38] 8.90% [1],[2],[10],[37]
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 [1],[2],[10],[37] $ 198  
Fair value at ending balance [1],[2],[10],[37]   $ 198
Interest [1],[2],[10],[37]   6.00%
Interest [1],[2],[10],[37]   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 [1],[2],[10],[37] 1,475  
Fair value at ending balance $ 1,478 [4],[5],[7],[38] $ 1,475 [1],[2],[10],[37]
Interest 10.50% [4],[5],[7],[38] 10.50% [1],[2],[10],[37]
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 [1],[2],[10],[22] $ 2,969  
Fair value at ending balance $ 3,033 [4],[5],[7],[23] $ 2,969 [1],[2],[10],[22]
Interest 5.75% [4],[5],[7],[23] 5.75% [1],[2],[10],[22]
Interest 8.80% [4],[5],[7],[23] 8.00% [1],[2],[10],[22]
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 [1],[2],[17] $ 9,094  
Fair value at ending balance $ 9,102 [4],[5],[19] $ 9,094 [1],[2],[17]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.60% [4],[5],[19] 9.20% [1],[2],[17]
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 [1],[2],[10],[22] $ 6,164  
Fair value at ending balance $ 6,288 [4],[5],[7],[23] $ 6,164 [1],[2],[10],[22]
Interest 5.75% [4],[5],[7],[23] 5.75% [1],[2],[10],[22]
Interest 8.30% [4],[5],[7],[23] 7.50% [1],[2],[10],[22]
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 [2],[10],[15] $ 0  
Fair value at ending balance [15] $ 0 [5],[7] $ 0 [2],[10]
Investment owned, balance (in shares) [15] 464 [5],[7],[8],[9] 464 [2],[10],[11],[12]
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 [2],[10] $ 50  
Fair value at ending balance $ 53 [5],[7] $ 50 [2],[10]
Investment, interest rate, paid in kind 10.00% [5],[7] 10.00% [2],[10]
Investment owned, balance (in shares) 41,560 [5],[7],[8],[9] 41,560 [2],[10],[11],[12]
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 [1],[2],[10],[21] $ 126  
Fair value at ending balance $ 126 [4],[5],[6],[7] $ 126 [1],[2],[10],[21]
Interest 6.50% [4],[5],[6],[7] 5.75% [1],[2],[10],[21]
Interest 11.30% [4],[5],[6],[7] 10.30% [1],[2],[10],[21]
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 [1],[2],[10],[34] $ 1,536  
Fair value at ending balance $ 1,582 [4],[5],[7],[35] $ 1,536 [1],[2],[10],[34]
Interest 6.50% [4],[5],[7],[35] 5.75% [1],[2],[10],[34]
Interest 10.70% [4],[5],[7],[35] 9.20% [1],[2],[10],[34]
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 [1],[2],[10],[22] $ 1,547  
Fair value at ending balance $ 1,708 [4],[5],[7],[23] $ 1,547 [1],[2],[10],[22]
Interest 6.50% [4],[5],[7],[23] 5.75% [1],[2],[10],[22]
Interest 9.50% [4],[5],[7],[23] 8.00% [1],[2],[10],[22]
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 [2],[10] $ 50  
Fair value at ending balance $ 53 [5],[7] $ 50 [2],[10]
Investment, interest rate, paid in kind 10.00% [5],[7] 10.00% [2],[10]
Investment owned, balance (in shares) 41,560 [5],[7],[8],[9] 41,560 [2],[10],[11],[12]
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 [2],[10] $ 487  
Fair value at ending balance $ 535 [5],[7] $ 487 [2],[10]
Investment, interest rate, paid in kind 10.50% [5],[7] 10.50% [2],[10]
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 [1],[2],[17] $ 3,896  
Fair value at ending balance $ 3,899 [4],[5],[19] $ 3,896 [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.00% [4],[5],[19] 10.20% [1],[2],[17]
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 [1],[2],[28] $ 4,932  
Fair value at ending balance $ 4,949 [4],[5],[29] $ 4,932 [1],[2],[28]
Interest 5.50% [4],[5],[29] 5.50% [1],[2],[28]
Interest 9.70% [4],[5],[29] 9.70% [1],[2],[28]
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 [1],[2],[10],[34] $ 1,886  
Fair value at ending balance $ 1,971 [4],[5],[7],[35] $ 1,886 [1],[2],[10],[34]
Interest 5.75% [4],[5],[7],[35] 5.00% [1],[2],[10],[34]
Interest 9.90% [4],[5],[7],[35] 9.40% [1],[2],[10],[34]
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 [1],[2],[10],[32] $ 1,305  
Fair value at ending balance $ 1,331 [4],[5],[7],[33] $ 1,305 [1],[2],[10],[32]
Interest 6.25% [4],[5],[7],[33] 6.25% [1],[2],[10],[32]
Interest 8.10% [4],[5],[7],[33] 8.10% [1],[2],[10],[32]
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 [1],[2],[10],[34] $ 704  
Fair value at ending balance $ 725 [4],[5],[7],[38] $ 704 [1],[2],[10],[34]
Interest 7.25% [4],[5],[7],[38] 7.25% [1],[2],[10],[34]
Interest 11.40% [4],[5],[7],[38] 10.70% [1],[2],[10],[34]
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 [1],[2],[10],[39] $ 2,298  
Fair value at ending balance $ 2,292 [4],[5],[7],[40] $ 2,298 [1],[2],[10],[39]
Interest 4.50% [4],[5],[7],[40] 4.50% [1],[2],[10],[39]
Interest 8.30% [4],[5],[7],[40] 7.70% [1],[2],[10],[39]
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 [1],[2],[3],[14] $ 27,794  
Fair value at ending balance $ 28,398 [4],[5],[13],[30] $ 27,794 [1],[2],[3],[14]
Interest 2.00% [4],[5],[13],[30] 2.00% [1],[2],[3],[14]
Interest 6.80% [4],[5],[13],[30] 6.40% [1],[2],[3],[14]
Investment, interest rate, paid in kind 6.50% [4],[5],[13],[30] 6.50% [1],[2],[3],[14]
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 [2],[20] $ 183  
Fair value at ending balance $ 172 [5],[15] $ 183 [2],[20]
Investment owned, balance (in shares) 192,307.7 [5],[8],[9],[15] 192,307.7 [2],[11],[12],[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 [1],[2],[17] $ 4,489  
Fair value at ending balance $ 4,487 [4],[5],[19] $ 4,489 [1],[2],[17]
Interest 5.25% [4],[5],[19] 5.25% [1],[2],[17]
Interest 10.10% [4],[5],[19] 10.00% [1],[2],[17]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[17] $ (6)  
Fair value at ending balance $ (5) [4],[5],[19] $ (6) [1],[2],[17]
Interest 5.25% [4],[5],[19] 5.25% [1],[2],[17]
Interest 10.10% [4],[5],[19] 10.00% [1],[2],[17]
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 [2] $ 1,403  
Fair value at ending balance $ 1,448 [5] $ 1,403 [2]
Investment, interest rate, paid in kind 12.00% [5] 12.00% [2]
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 [4],[5],[6] $ 13,536  
Interest [4],[5],[6] 6.00%  
Interest [4],[5],[6] 10.90%  
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 [1],[2],[22] $ 9,495  
Fair value at ending balance $ 9,778 [4],[5],[23] $ 9,495 [1],[2],[22]
Interest 9.50% [4],[5],[23] 9.50% [1],[2],[22]
Interest 12.50% [4],[5],[23] 11.60% [1],[2],[22]
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 [1],[2],[10],[32] $ 5,944  
Fair value at ending balance $ 6,127 [4],[5],[7],[33] $ 5,944 [1],[2],[10],[32]
Interest 5.00% [4],[5],[7],[33] 5.50% [1],[2],[10],[32]
Interest 7.80% [4],[5],[7],[33] 6.70% [1],[2],[10],[32]
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 [1],[2],[10],[41] $ 1,060  
Fair value at ending balance $ 1,065 [4],[5],[7],[42] $ 1,060 [1],[2],[10],[41]
Interest 5.25% [4],[5],[7],[42] 5.25% [1],[2],[10],[41]
Interest 8.50% [4],[5],[7],[42] 7.90% [1],[2],[10],[41]
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 [1],[2],[3] $ 2,493  
Fair value at ending balance $ 2,495 [4],[5],[30] $ 2,493 [1],[2],[3]
Interest 4.50% [4],[5],[30] 4.50% [1],[2],[3]
Interest 9.30% [4],[5],[30] 8.90% [1],[2],[3]
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 [1],[2],[10],[32] $ 7,254  
Fair value at ending balance $ 7,445 [4],[5],[7],[33] $ 7,254 [1],[2],[10],[32]
Interest 6.50% [4],[5],[7],[33] 6.50% [1],[2],[10],[32]
Interest 8.60% [4],[5],[7],[33] 8.60% [1],[2],[10],[32]
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 [1],[2],[10],[21] $ 2,484  
Fair value at ending balance $ 2,504 [4],[5],[6],[7] $ 2,484 [1],[2],[10],[21]
Interest 5.75% [4],[5],[6],[7] 5.50% [1],[2],[10],[21]
Interest 10.30% [4],[5],[6],[7] 9.80% [1],[2],[10],[21]
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 [1],[2],[10],[34] $ 792  
Fair value at ending balance $ 820 [4],[5],[7],[35] $ 792 [1],[2],[10],[34]
Interest 5.75% [4],[5],[7],[35] 5.50% [1],[2],[10],[34]
Interest 9.90% [4],[5],[7],[35] 9.00% [1],[2],[10],[34]
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 [1],[2],[10],[22] $ 2,939  
Fair value at ending balance $ 3,732 [4],[5],[7],[23] $ 2,939 [1],[2],[10],[22]
Interest 6.25% [4],[5],[7],[23] 6.25% [1],[2],[10],[22]
Interest 9.10% [4],[5],[7],[23] 8.20% [1],[2],[10],[22]
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 $ 0
Gross Additions 0 5,647
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 0
Fair value at ending balance 5,647 5,647
Amount of Interest or Dividends Credited to Income $ 191 $ 544
Interest 13.50% 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 $ 0
Gross Additions 0 9,628
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (339) (481)
Fair value at ending balance 8,808 9,147
Amount of Interest or Dividends Credited to Income $ 0 $ 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 [1],[2],[3],[14] $ 5,647  
Fair value at ending balance $ 5,647 [4],[5],[13],[30] $ 5,647 [1],[2],[3],[14]
Interest 9.10% [4],[5],[13],[30] 9.10% [1],[2],[3],[14]
Interest 14.20% [4],[5],[13],[30] 13.50% [1],[2],[3],[14]
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 [2],[14],[16] $ 9,147  
Fair value at ending balance $ 8,808 [5],[13],[18] $ 9,147 [2],[14],[16]
Investment, interest rate, paid in kind 10.00% [5],[13],[18] 10.00% [2],[14],[16]
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 [2],[14],[20] $ 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14],[20]
Investment owned, balance (in shares) 44.6 [5],[8],[9],[13],[15] 44.6 [2],[11],[12],[14],[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 $ 0
Gross Additions 0 0
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 0
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income $ 0 $ 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 [1],[2],[17] $ 1,735  
Fair value at ending balance $ 1,529 [4],[5],[19] $ 1,735 [1],[2],[17]
Interest 5.25% [4],[5],[19] 5.25% [1],[2],[17]
Interest 10.20% [4],[5],[19] 10.00% [1],[2],[17]
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 $ 28,525 $ 28,300
Interest 11.50% 11.50%
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 [2] $ 14,731  
Fair value at ending balance $ 14,854 [5] $ 14,731 [2]
Investment, interest rate, paid in kind 7.00% [5] 7.00% [2]
Investment owned, balance (in shares) 14,618 [5],[8],[9] 14,618 [2],[11],[12]
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 [1],[2],[17] $ 4,724  
Fair value at ending balance $ 4,701 [4],[5],[19] $ 4,724 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.90% [4],[5],[19] 10.50% [1],[2],[17]
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 [2],[20] $ 1,152  
Fair value at ending balance $ 1,517 [5],[15] $ 1,152 [2],[20]
Investment owned, balance (in shares) 1,107,492.71 [5],[8],[9],[15] 1,107,492.71 [2],[11],[12],[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 [1],[2],[17] $ (12)  
Fair value at ending balance $ 1,318 [4],[5],[19] $ (12) [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.70% [4],[5],[19] 10.50% [1],[2],[17]
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 [2] $ 4,350  
Fair value at ending balance $ 4,400 [5] $ 4,350 [2]
Interest 8.00% [5] 8.00% [2]
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 [1],[2],[10],[22] $ 2,156  
Fair value at ending balance $ 2,157 [4],[5],[7],[23] $ 2,156 [1],[2],[10],[22]
Interest 5.25% [4],[5],[7],[23] 5.00% [1],[2],[10],[22]
Interest 7.30% [4],[5],[7],[23] 6.50% [1],[2],[10],[22]
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 $ 691 $ 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 [1],[2],[10],[34] $ 13,454  
Fair value at ending balance $ 13,864 [4],[5],[7],[38] $ 13,454 [1],[2],[10],[34]
Interest 7.00% [4],[5],[7],[38] 7.00% [1],[2],[10],[34]
Interest 10.70% [4],[5],[7],[38] 9.30% [1],[2],[10],[34]
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 [1],[14],[21] $ 2,478  
Fair value at ending balance $ 2,568 [4],[6],[13] $ 2,478 [1],[14],[21]
Interest 4.00% [4],[6],[13] 4.00% [1],[14],[21]
Interest 9.00% [4],[6],[13] 8.50% [1],[14],[21]
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 [1],[2],[17] $ 6,281  
Fair value at ending balance $ 6,281 [4],[5],[19] $ 6,281 [1],[2],[17]
Interest 5.25% [4],[5],[19] 5.25% [1],[2],[17]
Interest 10.40% [4],[5],[19] 10.00% [1],[2],[17]
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 [2],[20] $ 446  
Fair value at ending balance $ 478 [5],[15] $ 446 [2],[20]
Investment owned, balance (in shares) 455 [5],[8],[9],[15] 455 [2],[11],[12],[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 [1],[2],[26] $ 4,390  
Fair value at ending balance $ 4,405 [4],[5],[27] $ 4,390 [1],[2],[26]
Interest 9.00% [4],[5],[27] 9.00% [1],[2],[26]
Interest 13.90% [4],[5],[27] 13.30% [1],[2],[26]
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 [2],[10] $ 5,239  
Fair value at ending balance 4,275 [5],[7] $ 5,239 [2],[10]
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 [1],[2],[17] 1,341  
Fair value at ending balance $ 1,330 [4],[5],[19] $ 1,341 [1],[2],[17]
Interest 6.25% [4],[5],[19] 6.25% [1],[2],[17]
Interest 11.40% [4],[5],[19] 10.20% [1],[2],[17]
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 [1],[2],[17] $ 4,879  
Fair value at ending balance $ 4,837 [4],[5],[19] $ 4,879 [1],[2],[17]
Interest 6.25% [4],[5],[19] 6.25% [1],[2],[17]
Interest 11.40% [4],[5],[19] 11.00% [1],[2],[17]
Investment, Identifier [Axis]: CAi Software, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[17] $ (24)  
Fair value at ending balance $ (30) [4],[5],[19] $ (24) [1],[2],[17]
Interest 6.25% [4],[5],[19] 6.25% [1],[2],[17]
Interest 11.40% [4],[5],[19] 11.00% [1],[2],[17]
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 [1],[2],[3] $ 10,377  
Fair value at ending balance $ 9,988 [4],[5],[30] $ 10,377 [1],[2],[3]
Interest 4.75% [4],[5],[30] 4.50% [1],[2],[3]
Interest 9.50% [4],[5],[30] 8.80% [1],[2],[3]
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 [1],[2],[21] $ 1,344  
Fair value at ending balance $ 1,344 [4],[5],[6] $ 1,344 [1],[2],[21]
Interest 4.75% [4],[5],[6] 4.75% [1],[2],[21]
Interest 9.70% [4],[5],[6] 9.30% [1],[2],[21]
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 [2],[20] $ 1,027  
Fair value at ending balance $ 1,030 [5],[15] $ 1,027 [2],[20]
Investment owned, balance (in shares) 551 [5],[8],[9],[15] 551 [2],[11],[12],[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 [1],[2],[3] $ (49)  
Fair value at ending balance $ (45) [4],[5],[30] $ (49) [1],[2],[3]
Interest [4],[5],[30] 4.75%  
Interest [4],[5],[30] 9.50%  
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 [1],[2],[21] $ 18,060  
Fair value at ending balance $ 18,220 [4],[5],[6] $ 18,060 [1],[2],[21]
Interest 5.00% [4],[5],[6] 5.00% [1],[2],[21]
Interest 9.80% [4],[5],[6] 9.00% [1],[2],[21]
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 [1],[2],[17] $ 3,928  
Fair value at ending balance $ 3,951 [4],[5],[19] $ 3,928 [1],[2],[17]
Interest 5.00% [4],[5],[19] 5.00% [1],[2],[17]
Interest 9.80% [4],[5],[19] 9.20% [1],[2],[17]
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 [2] $ 165  
Fair value at ending balance $ 104 [5],[15] $ 165 [2]
Investment owned, balance (in shares) 8,782 [5],[8],[9],[15] 8,782 [2],[11],[12]
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 [1],[2],[10],[43] $ 1,921  
Fair value at ending balance $ 1,980 [4],[5],[7],[44] $ 1,921 [1],[2],[10],[43]
Interest 5.50% [4],[5],[7],[44] 5.25% [1],[2],[10],[43]
Interest 9.70% [4],[5],[7],[44] 8.70% [1],[2],[10],[43]
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 [1],[3],[14] $ 4,505  
Fair value at ending balance $ 4,676 [4],[13],[30] $ 4,505 [1],[3],[14]
Interest 4.25% [4],[13],[30] 4.25% [1],[3],[14]
Interest 9.10% [4],[13],[30] 8.60% [1],[3],[14]
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 [1],[2],[10],[22] $ 891  
Fair value at ending balance $ 909 [4],[5],[7],[23] $ 891 [1],[2],[10],[22]
Interest 5.50% [4],[5],[7],[23] 5.50% [1],[2],[10],[22]
Interest 8.30% [4],[5],[7],[23] 7.60% [1],[2],[10],[22]
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 [1],[2],[10],[21] $ 1,122  
Fair value at ending balance $ 1,124 [4],[5],[6],[7] $ 1,122 [1],[2],[10],[21]
Interest 5.50% [4],[5],[6],[7] 5.50% [1],[2],[10],[21]
Interest 10.50% [4],[5],[6],[7] 10.20% [1],[2],[10],[21]
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 [2],[20] $ 204  
Fair value at ending balance $ 243 [5],[15] $ 204 [2],[20]
Investment owned, balance (in shares) 161,290.32 [5],[8],[9],[15] 161,290.32 [2],[11],[12],[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 [1],[2],[3] $ 2,766  
Fair value at ending balance $ 2,765 [4],[5],[30] $ 2,766 [1],[2],[3]
Interest 6.00% [4],[5],[30] 6.00% [1],[2],[3]
Interest 10.90% [4],[5],[30] 10.40% [1],[2],[3]
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 [1],[2],[17] $ 6,580  
Fair value at ending balance $ 6,677 [4],[5],[19] $ 6,580 [1],[2],[17]
Interest 6.25% [4],[5],[19] 6.50% [1],[2],[17]
Interest 11.40% [4],[5],[19] 11.20% [1],[2],[17]
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 [1],[2],[17] $ 11,080  
Fair value at ending balance $ 11,080 [4],[5],[19] $ 11,080 [1],[2],[17]
Interest 6.50% [4],[5],[19] 6.50% [1],[2],[17]
Interest 11.70% [4],[5],[19] 11.20% [1],[2],[17]
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 [2],[10],[20] $ 292  
Fair value at ending balance $ 0 [5],[7],[15] $ 292 [2],[10],[20]
Investment owned, balance (in shares) 500,000 [5],[7],[8],[9],[15] 500,000 [2],[10],[11],[12],[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 [2],[10],[20] $ 0  
Fair value at ending balance $ 0 [5],[7],[15] $ 0 [2],[10],[20]
Investment owned, balance (in shares) 74,712.64 [5],[7],[8],[9],[15] 74,712.64 [2],[10],[11],[12],[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 [1],[2],[10],[45] $ 1,468  
Fair value at ending balance $ 1,403 [4],[5],[7],[46] $ 1,468 [1],[2],[10],[45]
Interest 7.00% [4],[5],[7],[46] 7.00% [1],[2],[10],[45]
Interest 3.50% [4],[5],[7],[46] 11.90% [1],[2],[10],[45]
Investment, interest rate, paid in kind [4],[5],[7],[46] 8.50%  
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 [1],[2],[10],[21] $ 4,269  
Fair value at ending balance $ 4,274 [4],[5],[6],[7] $ 4,269 [1],[2],[10],[21]
Interest 7.64% [4],[5],[6],[7] 7.64% [1],[2],[10],[21]
Interest 12.50% [4],[5],[6],[7] 12.50% [1],[2],[10],[21]
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 [2],[10],[20] $ 627  
Fair value at ending balance $ 655 [5],[7],[15] $ 627 [2],[10],[20]
Investment owned, balance (in shares) 681,818 [5],[7],[8],[9],[15] 681,818 [2],[10],[11],[12],[20]
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 [15] $ 1,339  
Fair value at ending balance [15] $ 1,838 $ 1,339
Interest 8.50% 8.50%
Investment owned, balance (in shares) [15] 219,504 [8],[9] 94,155 [11],[12]
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 4,719 $ 5,113
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, Series A Convertible Preferred    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 914  
Investment, interest rate, paid in kind [15] 15.00%  
Investment owned, balance (in shares) [8],[9],[15] 10,980  
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 $ 820  
Fair value at ending balance $ 1,717 [4],[5],[7],[23] $ 820
Interest 5.25% [4],[5],[7],[23] 5.25%
Interest 7.80% [4],[5],[7],[23] 7.10%
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 $ 1,158  
Fair value at ending balance $ 430 [4],[5],[7],[23] $ 1,158
Interest 5.75% [4],[5],[7],[23] 5.75%
Interest 7.90% [4],[5],[7],[23] 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 [1],[2],[10],[32] $ 3,139  
Fair value at ending balance $ 3,274 [4],[5],[7],[33] $ 3,139 [1],[2],[10],[32]
Interest 5.50% [4],[5],[7],[33] 5.50% [1],[2],[10],[32]
Interest 7.10% [4],[5],[7],[33] 7.10% [1],[2],[10],[32]
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
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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 [2],[10],[20] 0  
Fair value at ending balance $ 0 [7],[15] $ 0 [2],[10],[20]
Investment owned, balance (in shares) 553,375 [7],[8],[9],[15] 553,375 [2],[10],[11],[12],[20]
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 [1],[2],[3] $ 6,189  
Fair value at ending balance $ 6,203 [4],[5],[6] $ 6,189 [1],[2],[3]
Interest 5.75% [4],[5],[6] 5.75% [1],[2],[3]
Interest 10.70% [4],[5],[6] 10.10% [1],[2],[3]
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 [4],[5],[6] $ 523  
Interest [4],[5],[6] 5.75%  
Interest [4],[5],[6] 10.70%  
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 [1],[2],[3] $ 523  
Fair value at ending balance [1],[2],[3]   $ 523
Interest [1],[2],[3]   5.75%
Interest [1],[2],[3]   10.10%
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 [2],[20] 10,729  
Fair value at ending balance $ 10,718 [5],[15] $ 10,729 [2],[20]
Investment owned, balance (in shares) 2,037,735 [5],[8],[9],[15] 2,037,735 [2],[11],[12],[20]
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 [2] $ 6,036  
Fair value at ending balance $ 6,194 [5] $ 6,036 [2]
Investment, interest rate, paid in kind 10.00% [5] 10.00% [2]
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 [2] $ 15,528  
Fair value at ending balance $ 15,558 [5] $ 15,528 [2]
Interest 8.00% [5] 8.00% [2]
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 [1],[2],[10],[17] $ 1,270  
Fair value at ending balance $ 1,285 [4],[5],[7],[19] $ 1,270 [1],[2],[10],[17]
Interest 6.25% [4],[5],[7],[19] 6.25% [1],[2],[10],[17]
Interest 11.40% [4],[5],[7],[19] 11.00% [1],[2],[10],[17]
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 [2],[20] $ 196  
Fair value at ending balance $ 208 [5],[15] $ 196 [2],[20]
Investment owned, balance (in shares) 33,324.69 [5],[8],[9],[15] 33,324.69 [2],[11],[12],[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 [1],[2],[26] $ 13,302  
Fair value at ending balance $ 13,346 [4],[5],[27] $ 13,302 [1],[2],[26]
Interest 7.75% [4],[5],[27] 7.75% [1],[2],[26]
Interest 12.60% [4],[5],[27] 12.10% [1],[2],[26]
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 [2],[20] $ 159  
Fair value at ending balance $ 164 [5],[15] $ 159 [2],[20]
Investment owned, balance (in shares) 46,085.6 [5],[8],[9],[15] 46,085.6 [2],[11],[12],[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 [2] $ 369  
Fair value at ending balance $ 371 [5] $ 369 [2]
Interest 11.00% [5] 11.00% [2]
Investment, interest rate, paid in kind 1.00% [5] 1.00% [2]
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 [1],[2],[28] $ 13,446  
Fair value at ending balance $ 13,434 [4],[5],[29] $ 13,446 [1],[2],[28]
Interest 5.75% [4],[5],[29] 5.75% [1],[2],[28]
Interest 10.60% [4],[5],[29] 10.60% [1],[2],[28]
Investment, Identifier [Axis]: Comply365, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[28] $ 148  
Fair value at ending balance $ (15) [4],[5],[29] $ 148 [1],[2],[28]
Interest 5.75% [4],[5],[29] 5.75% [1],[2],[28]
Interest 10.60% [4],[5],[29] 10.60% [1],[2],[28]
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 [1],[2],[10],[22] $ 4,845  
Fair value at ending balance $ 4,951 [4],[5],[7],[23] $ 4,845 [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[23] 6.00% [1],[2],[10],[22]
Interest 8.50% [4],[5],[7],[23] 7.60% [1],[2],[10],[22]
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 $ 28 [15] $ 7 [20]
Investment owned, balance (in shares) 91,504 [8],[9],[15] 91,504 [11],[12],[20]
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 [2] $ 11,118  
Fair value at ending balance $ 15,031 [5],[18] $ 11,118 [2]
Interest 13.00% [5],[18] 13.00% [2]
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 [2],[10],[20] $ 196  
Fair value at ending balance $ 202 [5],[7],[15] $ 196 [2],[10],[20]
Investment owned, balance (in shares) 440 [5],[7],[8],[9],[15] 440 [2],[10],[11],[12],[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 [2],[10],[20] $ 497  
Fair value at ending balance $ 514 [5],[7],[15] $ 497 [2],[10],[20]
Investment owned, balance (in shares) 191 [5],[7],[8],[9],[15] 191 [2],[10],[11],[12],[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 [1],[2],[10],[32] $ 4,233  
Fair value at ending balance $ 4,457 [4],[5],[7],[33] $ 4,233 [1],[2],[10],[32]
Interest 6.50% [4],[5],[7],[33] 3.25% [1],[2],[10],[32]
Interest 9.30% [4],[5],[7],[33] 3.30% [1],[2],[10],[32]
Investment, interest rate, paid in kind 3.50% [4],[5],[7],[33] 3.50% [1],[2],[10],[32]
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 [2],[16],[47] $ 189  
Fair value at ending balance $ 80 [5],[18],[48] $ 189 [2],[16],[47]
Investment, interest rate, paid in kind 15.00% [5],[18],[48] 15.00% [2],[16],[47]
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 [2],[16],[47] $ 1,997  
Fair value at ending balance $ 844 [5],[18],[48] $ 1,997 [2],[16],[47]
Investment, interest rate, paid in kind 15.00% [5],[18],[48] 15.00% [2],[16],[47]
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 [1],[2],[26] $ 5,491  
Fair value at ending balance $ 5,507 [4],[5],[19] $ 5,491 [1],[2],[26]
Interest 5.50% [4],[5],[19] 5.50% [1],[2],[26]
Interest 10.20% [4],[5],[19] 9.80% [1],[2],[26]
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 [1],[2],[26] $ 0  
Fair value at ending balance $ (11) [4],[5],[27] $ 0 [1],[2],[26]
Interest 5.50% [4],[5],[27] 5.50% [1],[2],[26]
Interest 10.20% [4],[5],[27] 9.80% [1],[2],[26]
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 [1],[2],[14],[17] $ 14,259  
Fair value at ending balance $ 14,222 [4],[5],[13],[19] $ 14,259 [1],[2],[14],[17]
Interest 6.25% [4],[5],[13],[19] 6.25% [1],[2],[14],[17]
Interest 10.90% [4],[5],[13],[19] 11.00% [1],[2],[14],[17]
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 [1],[2],[14],[17] $ 2,100  
Fair value at ending balance $ 2,100 [4],[5],[13],[19] $ 2,100 [1],[2],[14],[17]
Interest 6.25% [4],[5],[13],[19] 6.25% [1],[2],[14],[17]
Interest 10.90% [4],[5],[13],[19] 11.00% [1],[2],[14],[17]
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 [1],[2],[21] $ 1,875  
Fair value at ending balance $ 1,876 [4],[5],[6] $ 1,875 [1],[2],[21]
Interest 6.00% [4],[5],[6] 6.00% [1],[2],[21]
Interest 10.80% [4],[5],[6] 10.30% [1],[2],[21]
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 [2] $ 96  
Fair value at ending balance $ 100 [5],[15] $ 96 [2]
Investment owned, balance (in shares) 96,153.85 [5],[8],[9],[15] 96,153.85 [2],[11],[12]
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[21] $ (11)  
Fair value at ending balance $ (9) [4],[5],[6] $ (11) [1],[2],[21]
Interest 6.00% [4],[5],[6] 6.00% [1],[2],[21]
Interest 10.80% [4],[5],[6] 10.30% [1],[2],[21]
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 [2],[20] $ 48  
Fair value at ending balance $ 51 [5],[15] $ 48 [2],[20]
Investment owned, balance (in shares) 1,280.8 [5],[8],[9],[15] 1,280.8 [2],[11],[12],[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 [1],[2],[3] $ 690  
Fair value at ending balance $ 674 [4],[5],[30] $ 690 [1],[2],[3]
Interest 6.00% [4],[5],[30] 6.00% [1],[2],[3]
Interest 10.90% [4],[5],[30] 10.40% [1],[2],[3]
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3] $ (3)  
Fair value at ending balance $ (3) [4],[5],[30] $ (3) [1],[2],[3]
Interest 6.00% [4],[5],[30] 6.00% [1],[2],[3]
Interest 10.90% [4],[5],[30] 10.40% [1],[2],[3]
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 $ 6,096  
Fair value at ending balance $ 6,609 [4],[5],[6] $ 6,096
Interest 6.50% [4],[5],[6] 6.50%
Interest 11.30% [4],[5],[6] 10.70%
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 [1],[2],[10],[22] $ 2,515  
Fair value at ending balance $ 2,565 [4],[5],[7],[33] $ 2,515 [1],[2],[10],[22]
Interest 6.50% [4],[5],[7],[33] 6.50% [1],[2],[10],[22]
Interest 9.40% [4],[5],[7],[33] 8.10% [1],[2],[10],[22]
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 [1],[2],[10],[32] $ 1,153  
Fair value at ending balance $ 1,176 [4],[5],[7],[33] $ 1,153 [1],[2],[10],[32]
Interest 6.75% [4],[5],[7],[33] 6.75% [1],[2],[10],[32]
Interest 9.70% [4],[5],[7],[33] 8.90% [1],[2],[10],[32]
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 [1],[2],[10],[22] $ 2,247  
Fair value at ending balance $ 2,310 [4],[5],[7],[23] $ 2,247 [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[23] 6.00% [1],[2],[10],[22]
Interest 8.30% [4],[5],[7],[23] 8.20% [1],[2],[10],[22]
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 [10],[14] $ 2,084  
Fair value at ending balance 1,859 [7],[13] $ 2,084 [10],[14]
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 [10],[14] 4,267  
Fair value at ending balance 3,789 [7],[13] 4,267 [10],[14]
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 [1],[2],[10],[22] 111  
Fair value at ending balance $ 100 [4],[5],[7],[23] $ 111 [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[23] 5.75% [1],[2],[10],[22]
Interest 9.00% [4],[5],[7],[23] 8.00% [1],[2],[10],[22]
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 [1],[2],[10],[17] $ 1,209  
Fair value at ending balance $ 1,190 [4],[5],[7],[19] $ 1,209 [1],[2],[10],[17]
Interest 6.00% [4],[5],[7],[19] 5.75% [1],[2],[10],[17]
Interest 11.20% [4],[5],[7],[19] 10.50% [1],[2],[10],[17]
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 [1],[2],[10],[21] $ 988  
Fair value at ending balance $ 989 [4],[5],[6],[7] $ 988 [1],[2],[10],[21]
Interest 6.50% [4],[5],[6],[7] 6.50% [1],[2],[10],[21]
Interest 11.20% [4],[5],[6],[7] 10.70% [1],[2],[10],[21]
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Interest [4],[5],[19] 6.00%  
Interest [4],[5],[19] 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 [1],[2],[17] $ 25,287  
Fair value at ending balance 25,274 [4],[5],[19] $ 25,287 [1],[2],[17]
Interest [1],[2],[17]   6.00%
Interest [1],[2],[17]   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],[15] $ 231  
Investment owned, balance (in shares) [5],[8],[9],[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] $ 746  
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 [1],[2],[17] $ 12,008  
Fair value at ending balance $ 11,955 [4],[5],[19] $ 12,008 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 11.10% [4],[5],[19] 10.50% [1],[2],[17]
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 [1],[2],[17] $ 1,409  
Fair value at ending balance $ 1,786 [4],[5],[19] $ 1,409 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 11.10% [4],[5],[19] 10.50% [1],[2],[17]
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 [1],[2],[17] $ 6,024  
Fair value at ending balance $ 6,019 [4],[5],[19] $ 6,024 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.90% [4],[5],[19] 10.50% [1],[2],[17]
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 [2],[20] $ 933  
Fair value at ending balance $ 649 [5],[15] $ 933 [2],[20]
Investment owned, balance (in shares) 530.92 [5],[8],[9],[15] 530.92 [2],[11],[12],[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 [1],[2],[17] $ 9,100  
Fair value at ending balance $ 9,289 [4],[5],[30] $ 9,100 [1],[2],[17]
Interest 7.00% [4],[5],[30] 7.00% [1],[2],[17]
Interest 11.90% [4],[5],[30] 11.70% [1],[2],[17]
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 4,400 $ 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 [2] 135,066  
Fair value at ending balance $ 143,116 [5] $ 135,066 [2]
Investment owned, balance (in shares) 89,447,396 [5],[8],[9] 89,447,396 [2],[11],[12]
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 [2],[3] $ 5,273  
Fair value at ending balance $ 4,364 [5],[30] $ 5,273 [2],[3]
Interest 7.25% [5],[30] 7.25% [2],[3]
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 [2] $ 4,545  
Fair value at ending balance $ 4,545 [5] $ 4,545 [2]
Interest 7.50% [5] 7.50% [2]
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 $ 92,668
Gross Additions 0 3,380
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 8,050 39,018
Fair value at ending balance 143,116 135,066
Amount of Interest or Dividends Credited to Income $ 2,962 $ 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 $ 1,818
Gross Additions 0 5,292
Gross Reductions (905) (1,818)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (4) (19)
Fair value at ending balance 4,364 5,273
Amount of Interest or Dividends Credited to Income $ 162 $ 488
Interest 7.25% 7.25%
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 $ 4,738
Gross Additions 1 5
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (1) (198)
Fair value at ending balance 4,545 4,545
Amount of Interest or Dividends Credited to Income $ 86 $ 343
Interest 7.50% 7.50%
Investment, Identifier [Axis]: Ellkay, LLC, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Interest [4],[5],[19] 6.25%  
Interest [4],[5],[19] 11.40%  
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 [1],[2],[17] $ 4,893  
Fair value at ending balance 4,877 [4],[5],[19] $ 4,893 [1],[2],[17]
Interest [1],[2],[17]   6.25%
Interest [1],[2],[17]   11.00%
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 [1],[2],[17] 5,529  
Fair value at ending balance $ 5,498 [4],[5],[19] $ 5,529 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.90% [4],[5],[19] 11.70% [1],[2],[17]
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 [1],[2],[10],[22] $ 1,352  
Fair value at ending balance $ 1,390 [4],[5],[7],[23] $ 1,352 [1],[2],[10],[22]
Interest 6.75% [4],[5],[7],[23] 6.75% [1],[2],[10],[22]
Interest 9.70% [4],[5],[7],[23] 8.90% [1],[2],[10],[22]
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 [1],[2],[10],[21] $ 745  
Fair value at ending balance $ 748 [4],[5],[6],[7] $ 745 [1],[2],[10],[21]
Interest 7.00% [4],[5],[6],[7] 6.75% [1],[2],[10],[21]
Interest 12.10% [4],[5],[6],[7] 11.50% [1],[2],[10],[21]
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 [1],[2],[10],[34] $ 2,111  
Fair value at ending balance $ 2,176 [4],[5],[7],[35] $ 2,111 [1],[2],[10],[34]
Interest 6.75% [4],[5],[7],[35] 6.75% [1],[2],[10],[34]
Interest 10.80% [4],[5],[7],[35] 10.00% [1],[2],[10],[34]
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 [1],[2],[10] $ 513  
Fair value at ending balance $ 542 [5],[7] $ 513 [1],[2],[10]
Investment, interest rate, paid in kind 11.50% [5],[7] 11.50% [1],[2],[10]
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 [1],[2],[10],[49] $ 1,573  
Fair value at ending balance $ 1,523 [4],[5],[7],[40] $ 1,573 [1],[2],[10],[49]
Interest 6.50% [4],[5],[7],[40] 6.00% [1],[2],[10],[49]
Interest 10.30% [4],[5],[7],[40] 9.30% [1],[2],[10],[49]
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 [1],[2],[26] $ 7,106  
Fair value at ending balance $ 6,813 [4],[5],[27] $ 7,106 [1],[2],[26]
Interest 6.50% [4],[5],[27] 6.50% [1],[2],[26]
Interest 11.40% [4],[5],[27] 10.30% [1],[2],[26]
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 [1],[2],[26] $ 137  
Fair value at ending balance $ 127 [4],[5],[27] $ 137 [1],[2],[26]
Interest 6.50% [4],[5],[27] 6.50% [1],[2],[26]
Interest 11.40% [4],[5],[27] 10.30% [1],[2],[26]
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 [1],[2],[10],[22] $ 1,644  
Fair value at ending balance $ 1,657 [4],[5],[7],[23] $ 1,644 [1],[2],[10],[22]
Interest 6.25% [4],[5],[7],[23] 6.25% [1],[2],[10],[22]
Interest 9.00% [4],[5],[7],[23] 8.10% [1],[2],[10],[22]
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 [1],[2],[3] $ 6,767  
Fair value at ending balance $ 6,761 [4],[5],[30] $ 6,767 [1],[2],[3]
Interest 5.75% [4],[5],[30] 5.75% [1],[2],[3]
Interest 10.60% [4],[5],[30] 10.10% [1],[2],[3]
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 [2],[20] $ 17  
Fair value at ending balance $ 18 [5],[15] $ 17 [2],[20]
Investment owned, balance (in shares) 1,160.9 [5],[8],[9],[15] 1,160.9 [2],[11],[12],[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 [2],[20] $ 75  
Fair value at ending balance $ 77 [5],[15] $ 75 [2],[20]
Investment owned, balance (in shares) 5,104.3 [5],[8],[9],[15] 5,104.3 [2],[11],[12],[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 [4],[5],[7],[23] $ 1,583  
Interest [4],[5],[7],[23] 6.50%  
Interest [4],[5],[7],[23] 9.60%  
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 [2] $ 2,742  
Fair value at ending balance $ 2,597 [5] $ 2,742 [2]
Investment owned, balance (in shares) 2,886 [5],[8],[9] 2,886 [2],[11],[12]
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 [2] $ 6,084  
Fair value at ending balance $ 6,686 [5] $ 6,084 [2]
Investment, interest rate, paid in kind 11.00% [5] 11.00% [2]
Investment owned, balance (in shares) 6,582.7 [5],[8],[9] 6,582.7 [2],[11],[12]
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 [1],[2],[17] $ 1,270  
Fair value at ending balance $ 1,267 [4],[5],[19] $ 1,270 [1],[2],[17]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.90% [4],[5],[19] 9.50% [1],[2],[17]
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 [1],[2],[10],[32] $ 2,329  
Fair value at ending balance $ 2,383 [4],[5],[7],[33] $ 2,329 [1],[2],[10],[32]
Interest 6.25% [4],[5],[7],[33] 6.25% [1],[2],[10],[32]
Interest 9.50% [4],[5],[7],[33] 8.10% [1],[2],[10],[32]
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 [1],[2],[17] $ 4,165  
Fair value at ending balance $ 4,154 [4],[5],[19] $ 4,165 [1],[2],[17]
Interest 4.50% [4],[5],[19] 4.50% [1],[2],[17]
Interest 9.50% [4],[5],[19] 8.90% [1],[2],[17]
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 [2],[20] $ 962  
Fair value at ending balance $ 962 [5],[15] $ 962 [2],[20]
Investment owned, balance (in shares) 966.99 [5],[8],[9],[15] 966.99 [2],[11],[12],[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 [1],[2],[21] $ 13,295  
Fair value at ending balance $ 13,501 [4],[5],[6] $ 13,295 [1],[2],[21]
Interest 7.25% [4],[5],[6] 7.25% [1],[2],[21]
Interest 12.40% [4],[5],[6] 12.00% [1],[2],[21]
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 $ 13,380 $ 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 [2],[10],[20] $ 1,932  
Fair value at ending balance $ 1,941 [5],[7],[15] $ 1,932 [2],[10],[20]
Investment owned, balance (in shares) 1,921,648 [5],[7],[8],[9],[15] 1,921,648 [2],[10],[11],[12],[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 [1],[2],[10],[34] $ 1,437  
Fair value at ending balance $ 1,694 [4],[5],[7],[35] $ 1,437 [1],[2],[10],[34]
Interest 5.75% [4],[5],[7],[35] 5.75% [1],[2],[10],[34]
Interest 10.40% [4],[5],[7],[35] 9.20% [1],[2],[10],[34]
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 [1],[2],[26] $ 1,513  
Fair value at ending balance $ 1,517 [4],[5],[27] $ 1,513 [1],[2],[26]
Interest 5.25% [4],[5],[27] 5.25% [1],[2],[26]
Interest 10.20% [4],[5],[27] 9.90% [1],[2],[26]
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 [1],[2],[17] $ 4,638  
Fair value at ending balance $ 4,626 [4],[5],[19] $ 4,638 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.90% [4],[5],[19] 10.50% [1],[2],[17]
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 [2],[20] $ 1,179  
Fair value at ending balance $ 1,179 [5],[15] $ 1,179 [2],[20]
Investment owned, balance (in shares) 937.5 [5],[8],[9],[15] 937.5 [2],[11],[12],[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 $ 117 [15] $ 158 [20]
Investment owned, balance (in shares) 192,000 [8],[9],[15] 192,000 [11],[12],[20]
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 [1],[2],[17] $ 4,871  
Fair value at ending balance $ 4,828 [4],[5],[19] $ 4,871 [1],[2],[17]
Interest 12.50% [4],[5],[19] 12.50% [1],[2],[17]
Interest 17.40% [4],[5],[19] 17.20% [1],[2],[17]
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 [1],[2],[21] $ 16,271  
Fair value at ending balance $ 16,257 [4],[5],[6] $ 16,271 [1],[2],[21]
Interest 6.50% [4],[5],[6] 6.50% [1],[2],[21]
Interest 11.20% [4],[5],[6] 10.50% [1],[2],[21]
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 [2],[20] $ 687  
Fair value at ending balance $ 686 $ 687 [2],[20]
Investment owned, balance (in shares) 687 [8],[9] 687 [2],[11],[12],[20]
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 [1],[2],[21] $ (77)  
Fair value at ending balance $ (73) [4],[5],[6] $ (77) [1],[2],[21]
Interest 6.50% [4],[5],[6] 6.50% [1],[2],[21]
Interest 11.20% [4],[5],[6] 10.50% [1],[2],[21]
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 [1],[2],[10],[50] $ 375  
Fair value at ending balance $ 426 [4],[5],[7],[36] $ 375 [1],[2],[10],[50]
Interest 6.00% [4],[5],[7],[36] 5.50% [1],[2],[10],[50]
Interest 7.90% [4],[5],[7],[36] 7.40% [1],[2],[10],[50]
Investment, interest rate, paid in kind [4],[5],[7],[36] 1.00%  
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 [2],[47] $ 10,442  
Fair value at ending balance [2],[47]   $ 10,442
Interest [2],[47]   11.00%
Investment, interest rate, paid in kind [2],[47]   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 [2],[20],[47] 2,252  
Fair value at ending balance [2],[20],[47]   $ 2,252
Investment owned, balance (in shares) [2],[11],[12],[20],[47]   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 2,158  
Fair value at ending balance   $ 2,158
Investment owned, balance (in shares) [11],[12]   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 [1],[2],[10],[49] 2,438  
Fair value at ending balance $ 2,414 [4],[5],[7],[51] $ 2,438 [1],[2],[10],[49]
Interest 6.00% [4],[5],[7],[51] 6.00% [1],[2],[10],[49]
Interest 9.40% [4],[5],[7],[51] 9.10% [1],[2],[10],[49]
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 [1],[2],[10],[52] $ 4,242  
Fair value at ending balance $ 4,208 [4],[5],[7],[53] $ 4,242 [1],[2],[10],[52]
Interest 6.00% [4],[5],[7],[53] 6.00% [1],[2],[10],[52]
Interest 10.20% [4],[5],[7],[53] 9.10% [1],[2],[10],[52]
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 [1],[2],[10],[22] $ 716  
Fair value at ending balance $ 731 [4],[5],[7],[23] $ 716 [1],[2],[10],[22]
Interest 5.75% [4],[5],[7],[23] 5.75% [1],[2],[10],[22]
Interest 8.40% [4],[5],[7],[23] 7.10% [1],[2],[10],[22]
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 [1],[2],[10],[22] $ 598  
Fair value at ending balance $ 613 [4],[5],[7],[23] $ 598 [1],[2],[10],[22]
Interest 6.25% [4],[5],[7],[23] 6.25% [1],[2],[10],[22]
Interest 9.30% [4],[5],[7],[23] 8.50% [1],[2],[10],[22]
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 [1],[3] $ 772  
Fair value at ending balance $ 795 [4],[27] $ 772 [1],[3]
Interest 6.75% [4],[27] 6.75% [1],[3]
Interest 11.60% [4],[27] 11.00% [1],[3]
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 [1],[2],[10],[39] $ 2,136  
Fair value at ending balance $ 2,119 [4],[5],[7],[40] $ 2,136 [1],[2],[10],[39]
Interest 6.50% [4],[5],[7],[40] 6.50% [1],[2],[10],[39]
Interest 10.20% [4],[5],[7],[40] 10.20% [1],[2],[10],[39]
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 [1],[2],[10],[22] $ 4,846  
Fair value at ending balance $ 4,957 [4],[5],[7],[23] $ 4,846 [1],[2],[10],[22]
Interest 6.50% [4],[5],[7],[23] 6.50% [1],[2],[10],[22]
Interest 9.50% [4],[5],[7],[23] 8.70% [1],[2],[10],[22]
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 [1],[2],[21] $ (18)  
Fair value at ending balance $ (41) [4],[5],[29] $ (18) [1],[2],[21]
Interest 8.50% [4],[5],[29] 8.50% [1],[2],[21]
Interest 13.60% [4],[5],[29] 11.70% [1],[2],[21]
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 [1],[2],[21] $ 11,363  
Fair value at ending balance $ 11,107 [4],[5],[29] $ 11,363 [1],[2],[21]
Interest 8.50% [4],[5],[29] 8.50% [1],[2],[21]
Interest 13.60% [4],[5],[29] 11.70% [1],[2],[21]
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 [1],[2],[17] $ 4,928  
Fair value at ending balance $ 5,263 [4],[5],[19] $ 4,928 [1],[2],[17]
Interest 5.00% [4],[5],[19] 5.00% [1],[2],[17]
Interest 10.20% [4],[5],[19] 6.00% [1],[2],[17]
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 [1],[2],[3] $ 5,834  
Fair value at ending balance $ 5,800 [4],[5],[30] $ 5,834 [1],[2],[3]
Interest 5.00% [4],[5],[30] 5.00% [1],[2],[3]
Interest 9.80% [4],[5],[30] 9.30% [1],[2],[3]
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 [1],[2],[10],[49] $ 598  
Fair value at ending balance $ 593 [4],[5],[7],[51] $ 598 [1],[2],[10],[49]
Interest 4.75% [4],[5],[7],[51] 5.25% [1],[2],[10],[49]
Interest 8.50% [4],[5],[7],[51] 8.60% [1],[2],[10],[49]
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 [2] $ 1,151  
Fair value at ending balance $ 1,170 [5] $ 1,151 [2]
Investment, interest rate, paid in kind 11.00% [5] 11.00% [2]
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 [2] $ 9,183  
Fair value at ending balance $ 9,825 [5] $ 9,183 [2]
Investment, interest rate, paid in kind 11.00% [5] 11.00% [2]
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 [1],[2],[17] $ 13,795  
Fair value at ending balance $ 13,740 [4],[5],[19] $ 13,795 [1],[2],[17]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.90% [4],[5],[19] 9.50% [1],[2],[17]
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 [1],[2],[3] $ 7,276  
Fair value at ending balance $ 7,288 [4],[5],[30] $ 7,276 [1],[2],[3]
Interest 5.75% [4],[5],[30] 5.75% [1],[2],[3]
Interest 10.10% [4],[5],[30] 9.90% [1],[2],[3]
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 [1],[2],[3] $ (33)  
Fair value at ending balance $ (29) [4],[5],[30] $ (33) [1],[2],[3]
Interest 5.75% [4],[5],[30] 5.75% [1],[2],[3]
Interest 10.10% [4],[5],[30] 9.90% [1],[2],[3]
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 [1],[2],[10],[22] $ 3,148  
Fair value at ending balance $ 3,235 [4],[5],[7],[23] $ 3,148 [1],[2],[10],[22]
Interest 5.00% [4],[5],[7],[23] 5.00% [1],[2],[10],[22]
Interest 7.70% [4],[5],[7],[23] 6.90% [1],[2],[10],[22]
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 [1],[2],[14],[16],[54] $ 0  
Fair value at ending balance $ 0 [4],[5],[13],[18],[31] $ 0 [1],[2],[14],[16],[54]
Interest 9.00% [4],[5],[13],[18],[31] 9.00% [1],[2],[14],[16],[54]
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 [1],[2],[26] $ 3,621  
Fair value at ending balance $ 3,460 [4],[5],[27] $ 3,621 [1],[2],[26]
Interest 5.00% [4],[5],[27] 5.00% [1],[2],[26]
Interest 9.90% [4],[5],[27] 9.40% [1],[2],[26]
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 [1],[2],[10],[28] $ 7,814  
Fair value at ending balance $ 7,834 [4],[5],[7],[29] $ 7,814 [1],[2],[10],[28]
Interest 5.25% [4],[5],[7],[29] 5.25% [1],[2],[10],[28]
Interest 9.50% [4],[5],[7],[29] 9.50% [1],[2],[10],[28]
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 [1],[2],[10],[22] $ 1,665  
Fair value at ending balance $ 1,699 [4],[5],[7],[55] $ 1,665 [1],[2],[10],[22]
Interest 6.25% [4],[5],[7],[55] 6.25% [1],[2],[10],[22]
Interest 7.40% [4],[5],[7],[55] 8.40% [1],[2],[10],[22]
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 $ 0
Gross Additions 0 5,219
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 55 (723)
Fair value at ending balance 4,551 4,496
Amount of Interest or Dividends Credited to Income $ 0 $ 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 [2],[20] $ 4,496  
Fair value at ending balance $ 4,551 [5],[15] $ 4,496 [2],[20]
Investment owned, balance (in shares) 102,144 [5],[8],[9],[15] 102,144 [2],[11],[12],[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 [1],[2],[21] $ 3,917  
Fair value at ending balance $ 3,917 [4],[5],[6] $ 3,917 [1],[2],[21]
Interest 8.00% [4],[5],[6] 8.00% [1],[2],[21]
Interest 12.80% [4],[5],[6] 12.30% [1],[2],[21]
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 [1],[2],[21] $ 4,098  
Fair value at ending balance $ 4,239 [4],[5],[6] $ 4,098 [1],[2],[21]
Interest 10.00% [4],[5],[6] 10.00% [1],[2],[21]
Interest 14.80% [4],[5],[6] 14.30% [1],[2],[21]
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 $ 0
Gross Additions 18 3,569
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 101
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (18) 247
Fair value at ending balance 3,917 3,917
Amount of Interest or Dividends Credited to Income $ 149 $ 380
Interest 8.00% 8.00%
Interest 12.80% 12.30%
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 4,098 $ 0
Gross Additions 141 4,098
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 0
Fair value at ending balance 4,239 4,098
Amount of Interest or Dividends Credited to Income $ 162 $ 382
Interest 14.80% 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 [1],[2],[3] $ 3,247  
Fair value at ending balance $ 3,333 [4],[5],[30] $ 3,247 [1],[2],[3]
Interest 6.50% [4],[5],[30] 8.00% [1],[2],[3]
Interest 11.50% [4],[5],[30] 12.40% [1],[2],[3]
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 [2],[20] $ 0  
Fair value at ending balance $ 0 [5],[15] $ 0 [2],[20]
Investment owned, balance (in shares) 68,950 [5],[8],[9],[15] 68,950 [2],[11],[12],[20]
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 [1],[2],[10],[22] $ 2,583  
Fair value at ending balance $ 2,649 [4],[5],[7],[23] $ 2,583 [1],[2],[10],[22]
Interest 5.25% [4],[5],[7],[23] 5.25% [1],[2],[10],[22]
Interest 8.50% [4],[5],[7],[23] 7.50% [1],[2],[10],[22]
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 [1],[2],[10],[22] $ 4,892  
Fair value at ending balance $ 5,036 [4],[5],[7],[23] $ 4,892 [1],[2],[10],[22]
Interest 5.40% [4],[5],[7],[23] 5.40% [1],[2],[10],[22]
Interest 8.10% [4],[5],[7],[23] 7.40% [1],[2],[10],[22]
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 [2],[20] $ 127  
Fair value at ending balance $ 750 [5],[8],[9],[15] $ 127 [2],[20]
Investment owned, balance (in shares) 1,433.37 [5],[8],[9],[15] 1,433.37 [2],[11],[12],[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 [1],[2],[3] $ 703  
Fair value at ending balance $ 8,467 [4],[5],[6] $ 703 [1],[2],[3]
Interest 6.50% [4],[5],[6] 4.75% [1],[2],[3]
Interest 11.50% [4],[5],[6] 9.10% [1],[2],[3]
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 [1],[2],[3] $ 5  
Fair value at ending balance $ (4) [4],[5],[6] $ 5 [1],[2],[3]
Interest 6.50% [4],[5],[6] 4.75% [1],[2],[3]
Interest 11.50% [4],[5],[6] 9.10% [1],[2],[3]
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 [1],[2],[10],[32] $ 2,729  
Fair value at ending balance $ 2,812 [4],[5],[7],[33] $ 2,729 [1],[2],[10],[32]
Interest 5.00% [4],[5],[7],[33] 5.25% [1],[2],[10],[32]
Interest 8.20% [4],[5],[7],[33] 6.20% [1],[2],[10],[32]
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 [1],[2],[10],[32] $ 5,495  
Fair value at ending balance $ 5,648 [4],[5],[7],[33] $ 5,495 [1],[2],[10],[32]
Interest 6.50% [4],[5],[7],[33] 6.50% [1],[2],[10],[32]
Interest 9.30% [4],[5],[7],[33] 9.30% [1],[2],[10],[32]
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 [1],[14],[54] $ 2,277  
Fair value at ending balance $ 2,386 [4],[13],[29] $ 2,277 [1],[14],[54]
Interest 4.25% [4],[13],[29] 4.25% [1],[14],[54]
Interest 9.50% [4],[13],[29] 7.80% [1],[14],[54]
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 [1],[2],[10],[22] $ 1,239  
Fair value at ending balance $ 1,276 [4],[5],[7],[23] $ 1,239 [1],[2],[10],[22]
Interest 5.25% [4],[5],[7],[23] 5.25% [1],[2],[10],[22]
Interest 8.30% [4],[5],[7],[23] 7.50% [1],[2],[10],[22]
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 [1],[3],[14] $ 2,658  
Fair value at ending balance $ 2,654 [4],[13],[30] $ 2,658 [1],[3],[14]
Interest 7.50% [4],[13],[30] 7.50% [1],[3],[14]
Interest 12.30% [4],[13],[30] 11.90% [1],[3],[14]
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 [1],[2],[14],[16],[17] $ 553  
Fair value at ending balance $ 509 [4],[5],[13],[18],[19] $ 553 [1],[2],[14],[16],[17]
Interest 5.75% [4],[5],[13],[18],[19] 5.75% [1],[2],[14],[16],[17]
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 [1],[2],[10],[50] $ 4,436  
Fair value at ending balance $ 4,539 [4],[5],[7],[36] $ 4,436 [1],[2],[10],[50]
Interest 6.50% [4],[5],[7],[36] 6.50% [1],[2],[10],[50]
Interest 8.80% [4],[5],[7],[36] 8.10% [1],[2],[10],[50]
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 [1],[14],[17] $ 3,383  
Fair value at ending balance $ 3,528 [4],[13],[19] $ 3,383 [1],[14],[17]
Interest 7.25% [4],[13],[19] 7.25% [1],[14],[17]
Interest 12.20% [4],[13],[19] 12.00% [1],[14],[17]
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 [1],[2],[3] $ 3,575  
Fair value at ending balance $ 3,610 [4],[5],[30] $ 3,575 [1],[2],[3]
Interest 5.50% [4],[5],[30] 5.50% [1],[2],[3]
Interest 10.30% [4],[5],[30] 9.90% [1],[2],[3]
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
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   1,079
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   (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 [1],[2],[10],[32] 4,009  
Fair value at ending balance $ 4,089 [4],[5],[7],[33] $ 4,009 [1],[2],[10],[32]
Interest 5.50% [4],[5],[7],[33] 5.50% [1],[2],[10],[32]
Interest 7.90% [4],[5],[7],[33] 7.90% [1],[2],[10],[32]
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 [1],[2],[10],[28] $ 6,592  
Fair value at ending balance $ 6,606 [4],[5],[7],[29] $ 6,592 [1],[2],[10],[28]
Interest 5.50% [4],[5],[7],[29] 5.50% [1],[2],[10],[28]
Interest 9.30% [4],[5],[7],[29] 9.30% [1],[2],[10],[28]
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 [1],[2],[21] $ 7,617  
Fair value at ending balance [1],[2],[21]   $ 7,617
Interest [1],[2],[21]   5.00%
Interest [1],[2],[21]   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 [1],[2],[21] (2)  
Fair value at ending balance [1],[2],[21]   $ (2)
Interest [1],[2],[21]   5.00%
Interest [1],[2],[21]   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 [2],[47] 2,650  
Fair value at ending balance $ 2,650 [5],[48] $ 2,650 [2],[47]
Interest 12.00% [5],[48] 12.00% [2],[47]
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 $ 3,608 $ 3,511
Interest 8.00% 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 [10] $ 40,088  
Fair value at ending balance 40,930 [7] $ 40,088 [10]
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 5,000
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 842 (2,513)
Fair value at ending balance 40,930 40,088
Amount of Interest or Dividends Credited to Income 1,427 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 [1],[2],[10],[52] 3,477  
Fair value at ending balance $ 3,451 [4],[5],[7],[53] $ 3,477 [1],[2],[10],[52]
Interest 4.75% [4],[5],[7],[53] 5.50% [1],[2],[10],[52]
Interest 10.00% [4],[5],[7],[53] 10.20% [1],[2],[10],[52]
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 [1],[2],[17] $ 2,745  
Fair value at ending balance $ 2,680 [4],[5],[19] $ 2,745 [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.50% [4],[5],[19] 10.20% [1],[2],[17]
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[29] $ 675  
Interest [4],[5],[29] 5.75%  
Interest [4],[5],[29] 10.60%  
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 [2],[20] $ 115  
Fair value at ending balance $ 162 [5],[15] $ 115 [2],[20]
Investment owned, balance (in shares) 974.68 [5],[8],[9],[15] 974.68 [11],[12],[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 [1],[2],[17] $ (6)  
Fair value at ending balance $ (16) [4],[5],[19] $ (6) [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.50% [4],[5],[19] 10.20% [1],[2],[17]
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 [1],[2],[54] $ 5,545  
Fair value at ending balance $ 5,545 [4],[5],[31] $ 5,545 [1],[2],[54]
Interest 5.00% 5.00% [1],[2],[54]
Interest 10.10% 10.10% [1],[2],[54]
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 [2],[20] $ 191  
Fair value at ending balance $ 191 [5],[15] $ 191 [2],[20]
Investment owned, balance (in shares) 203.2 [8],[9] 203.2 [2],[11],[12],[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 $ 0
Gross Additions 0 1,589
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 612 (408)
Fair value at ending balance 1,793 1,181
Amount of Interest or Dividends Credited to Income $ 0 $ 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 $ 0
Gross Additions 150 2,785
Gross Reductions 0 (1,220)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 0
Fair value at ending balance 1,715 1,565
Amount of Interest or Dividends Credited to Income $ 62 $ 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 [2],[14],[20] $ 1,181  
Fair value at ending balance $ 1,793 [5],[13],[15] $ 1,181 [2],[14],[20]
Investment owned, balance (in shares) 6.78 [5],[8],[9],[13],[15] 6.78 [2],[11],[12],[14],[20]
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 [2],[14] $ 1,565  
Fair value at ending balance $ 1,715 [5],[13] $ 1,565 [2],[14]
Investment, interest rate, paid in kind 15.00% [5],[13] 15.00% [2],[14]
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 [1],[2],[17] $ 7,027  
Fair value at ending balance $ 7,021 [4],[5],[19] $ 7,027 [1],[2],[17]
Interest 4.25% 4.25% [1],[2],[17]
Interest 9.40% 9.00% [1],[2],[17]
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 [1],[2],[17] $ 9,125  
Fair value at ending balance $ 9,117 [4],[5],[19] $ 9,125 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.90% [4],[5],[19] 10.50% [1],[2],[17]
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 [2],[20] $ 577  
Fair value at ending balance $ 599 [5],[15] $ 577 [2],[20]
Investment owned, balance (in shares) 637,677.11 [5],[8],[9],[15] 637,677.11 [2],[11],[12],[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 [1],[2],[21] $ 8,623  
Fair value at ending balance $ 8,561 [4],[5],[6] $ 8,623 [1],[2],[21]
Interest 4.75% [4],[5],[6] 4.75% [1],[2],[21]
Interest 9.60% [4],[5],[6] 9.30% [1],[2],[21]
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 [1],[2],[10],[22] $ 4,397  
Fair value at ending balance $ 4,562 [4],[5],[7],[23] $ 4,397 [1],[2],[10],[22]
Interest 6.25% [4],[5],[7],[23] 6.00% [1],[2],[10],[22]
Interest 9.30% [4],[5],[7],[23] 8.50% [1],[2],[10],[22]
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 [2],[10] $ 1,409  
Fair value at ending balance $ 1,414 [5],[7] $ 1,409 [2],[10]
Investment, interest rate, paid in kind 12.00% [5],[7] 12.00% [2],[10]
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 [1],[2],[10],[28] $ 633  
Fair value at ending balance $ 674 [4],[5],[6],[7] $ 633 [1],[2],[10],[28]
Interest 5.75% [4],[5],[6],[7] 5.25% [1],[2],[10],[28]
Interest 9.90% [4],[5],[6],[7] 8.30% [1],[2],[10],[28]
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 [1],[2],[10],[21] $ 34  
Fair value at ending balance $ 34 [4],[5],[6],[7] $ 34 [1],[2],[10],[21]
Interest 5.75% [4],[5],[6],[7] 5.25% [1],[2],[10],[21]
Interest 10.10% [4],[5],[6],[7] 9.80% [1],[2],[10],[21]
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 [1],[2],[17] $ 10,150  
Fair value at ending balance $ 10,139 [4],[5],[19] $ 10,150 [1],[2],[17]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.50% [4],[5],[19] 9.50% [1],[2],[17]
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 [2],[20] $ 65  
Fair value at ending balance $ 72 [5] $ 65 [2],[20]
Investment owned, balance (in shares) 52,493.44 [5],[8],[9] 52,493.44 [2],[11],[12],[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 [1],[2],[17] $ (32)  
Fair value at ending balance $ (28) [4],[5],[19] $ (32) [1],[2],[17]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.50% [4],[5],[19] 9.50% [1],[2],[17]
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 [1],[3] $ 100  
Fair value at ending balance $ 93 [4],[30] $ 100 [1],[3]
Interest 3.25% [4],[30] 3.25% [1],[3]
Interest 8.10% [4],[30] 7.60% [1],[3]
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 $ 8,305 [19] $ 8,455 [17]
Interest 10.00% [19] 10.00% [17]
Interest 3.00% [19] 3.00% [17]
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 [2],[16],[47] $ 0  
Fair value at ending balance $ 39 [5],[7],[18],[48] $ 0 [2],[16],[47]
Investment, interest rate, paid in kind 16.00% [5],[18],[48] 16.00% [2],[16],[47]
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 [1],[2],[26] $ 19,846  
Fair value at ending balance $ 19,863 [4],[5],[6] $ 19,846 [1],[2],[26]
Interest 4.50% [4],[5],[6] 4.50% [1],[2],[26]
Interest 9.30% [4],[5],[6] 8.80% [1],[2],[26]
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 [1],[2],[14],[17] $ 2,980  
Fair value at ending balance $ 2,958 [4],[5],[13],[19] $ 2,980 [1],[2],[14],[17]
Interest 7.00% [4],[5],[13],[19] 7.00% [1],[2],[14],[17]
Interest 12.20% [4],[5],[13],[19] 10.70% [1],[2],[14],[17]
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 [1],[2],[14],[17] $ (168)  
Fair value at ending balance $ (170) [4],[5],[13],[19] $ (168) [1],[2],[14],[17]
Interest 7.00% [4],[5],[13],[19] 7.00% [1],[2],[14],[17]
Interest 12.20% [4],[5],[13],[19] 10.70% [1],[2],[14],[17]
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 [1],[2],[17] $ 837  
Fair value at ending balance $ 848 [4],[5],[19] $ 837 [1],[2],[17]
Interest 5.00% 5.00% [1],[2],[17]
Interest 9.90% 9.70% [1],[2],[17]
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 [1],[3],[14] $ 1,253  
Fair value at ending balance $ 1,109 [4],[13],[30] $ 1,253 [1],[3],[14]
Interest 4.75% [4],[13],[30] 4.75% [1],[3],[14]
Interest 9.60% [4],[13],[30] 9.10% [1],[3],[14]
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 [1],[2],[3] $ 7,816  
Fair value at ending balance $ 6,505 [4],[5],[30] $ 7,816 [1],[2],[3]
Interest 6.00% [4],[5],[30] 6.00% [1],[2],[3]
Interest 11.20% [4],[5],[30] 10.30% [1],[2],[3]
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 [1],[2],[3] $ 4,123  
Fair value at ending balance $ 4,121 [4],[5],[19] $ 4,123 [1],[2],[3]
Interest 5.50% [4],[5],[19] 5.50% [1],[2],[3]
Interest 10.30% [4],[5],[19] 9.90% [1],[2],[3]
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 [2],[20] $ 781  
Fair value at ending balance $ 906 [5],[15] $ 781 [2],[20]
Investment owned, balance (in shares) 746.66 [5],[8],[9],[15] 746.66 [2],[11],[12],[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 [1],[2],[3] $ 835  
Fair value at ending balance $ 792 [4],[5],[30] $ 835 [1],[2],[3]
Interest 5.50% [4],[5],[30] 5.50% [1],[2],[3]
Interest 10.50% [4],[5],[30] 9.90% [1],[2],[3]
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 [2],[20] $ 54  
Fair value at ending balance $ 25 [5],[15] $ 54 [2],[20]
Investment owned, balance (in shares) 76.92 [5],[8],[9],[15] 76.92 [2],[11],[12],[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 $ 7,149
Gross Additions 0 0
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 0
Fair value at ending balance 7,149 7,149
Amount of Interest or Dividends Credited to Income $ 107 $ 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 $ 7,699
Gross Additions 0 0
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 3,336 1,976
Fair value at ending balance 13,011 9,675
Amount of Interest or Dividends Credited to Income $ 0 $ 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 [2],[10],[47] $ 7,149  
Fair value at ending balance $ 7,149 [5],[7],[48] $ 7,149 [2],[10],[47]
Interest 4.50% [5],[7],[8],[9],[48] 6.00% [2],[10],[11],[12],[47]
Investment, interest rate, paid in kind [5],[7],[48] 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 [2],[10],[20],[47] $ 9,675  
Fair value at ending balance $ 13,011 [5],[7],[15],[48] $ 9,675 [2],[10],[20],[47]
Investment owned, balance (in shares) 18,000 [5],[7],[8],[9],[15],[48] 18,000 [2],[10],[11],[12],[20],[47]
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 $ 188
Gross Additions 0 0
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (3) (143)
Fair value at ending balance 42 45
Amount of Interest or Dividends Credited to Income $ 50 $ (831)
Investment owned, balance (in shares) 1,831.4 1,831.4
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 [10],[47] $ 45  
Fair value at ending balance $ 42 [7],[15],[48] $ 45 [10],[47]
Investment owned, balance (in shares) 1,831.4 [7],[8],[9],[15],[48] 1,831.4 [10],[11],[12],[47]
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 [10],[47] $ 1,793  
Fair value at ending balance $ 1,677 [7],[15],[48] $ 1,793 [10],[47]
Investment owned, balance (in shares) 71,790.4 [7],[8],[9],[15],[48] 71,790.4 [10],[11],[12],[47]
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 0
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (116) (5,583)
Fair value at ending balance 1,677 1,793
Amount of Interest or Dividends Credited to Income $ 0 $ 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 [10],[14] $ 4,450  
Fair value at ending balance $ 4,453 [7],[13],[19] $ 4,450 [10],[14]
Interest 8.77% [7],[13],[19] 8.77% [10],[14]
Interest 13.60% [7],[13],[19] 12.80% [10],[14]
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 [10],[14] $ 7,992  
Fair value at ending balance 8,301 [7],[13] $ 7,992 [10],[14]
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 [1],[2],[10],[32] 2,093  
Fair value at ending balance $ 1,913 [4],[5],[7],[33] $ 2,093 [1],[2],[10],[32]
Interest 6.00% [4],[5],[7],[33] 6.00% [1],[2],[10],[32]
Interest 8.80% [4],[5],[7],[33] 8.80% [1],[2],[10],[32]
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 [1],[2],[10],[22] $ 40  
Fair value at ending balance $ 25 [4],[5],[7],[23] $ 40 [1],[2],[10],[22]
Interest 5.00% [4],[5],[7],[23] 5.00% [1],[2],[10],[22]
Interest 7.80% [4],[5],[7],[23] 7.80% [1],[2],[10],[22]
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 [1],[2],[21] $ 10,794  
Fair value at ending balance $ 10,756 [4],[5],[6] $ 10,794 [1],[2],[21]
Interest 5.50% [4],[5],[6] 5.50% [1],[2],[21]
Interest 10.50% [4],[5],[6] 9.80% [1],[2],[21]
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 [1],[2],[56] $ 1,217  
Fair value at ending balance $ 1,577 [4],[5],[57] $ 1,217 [1],[2],[56]
Interest 5.50% [4],[5],[57] 4.50% [1],[2],[56]
Interest 13.50% [4],[5],[57] 11.50% [1],[2],[56]
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 [1],[2],[21] $ 2,903  
Fair value at ending balance $ 2,896 [4],[5],[6] $ 2,903 [1],[2],[21]
Interest 6.00% [4],[5],[6] 5.50% [1],[2],[21]
Interest 10.40% [4],[5],[6] 10.30% [1],[2],[21]
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 [1],[2],[43] $ 3,894  
Fair value at ending balance $ 4,002 [4],[5],[44] $ 3,894 [1],[2],[43]
Interest 6.00% [4],[5],[44] 6.00% [1],[2],[43]
Interest 10.20% [4],[5],[44] 9.40% [1],[2],[43]
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 [1],[10],[34] $ 7,449  
Fair value at ending balance $ 7,666 [4],[7],[38] $ 7,449 [1],[10],[34]
Interest 6.00% [4],[7],[38] 6.00% [1],[10],[34]
Interest 9.40% [4],[7],[38] 9.40% [1],[10],[34]
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 [1],[3] $ 4,067  
Fair value at ending balance $ 4,001 [4],[6] $ 4,067 [1],[3]
Interest 7.00% [4],[6] 7.00% [1],[3]
Interest 12.00% [4],[6] 11.40% [1],[3]
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 [2],[10],[20] $ 116  
Fair value at ending balance $ 115 [5],[7],[15] $ 116 [2],[10],[20]
Investment owned, balance (in shares) 114.4 [5],[7],[8],[9],[15] 114.4 [2],[10],[11],[12],[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 [2],[10],[20] $ 0  
Fair value at ending balance $ 54 [5],[7],[15] $ 0 [2],[10],[20]
Investment owned, balance (in shares) 28,943.8 [5],[7],[8],[9],[15] 28,943.8 [2],[10],[11],[12],[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 [1],[2],[10],[58] $ 3,102  
Fair value at ending balance $ 2,925 [4],[5],[7],[59] $ 3,102 [1],[2],[10],[58]
Interest 6.00% [4],[5],[7],[59] 6.00% [1],[2],[10],[58]
Interest 9.00% [4],[5],[7],[59] 9.10% [1],[2],[10],[58]
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 [1],[2],[10],[24] $ 7,634  
Fair value at ending balance $ 7,586 [4],[5],[7],[25] $ 7,634 [1],[2],[10],[24]
Interest 6.25% [4],[5],[7],[25] 6.25% [1],[2],[10],[24]
Interest 9.70% [4],[5],[7],[25] 9.10% [1],[2],[10],[24]
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 [1],[2],[10],[37] $ 1,150  
Fair value at ending balance $ 1,224 [4],[5],[7],[38] $ 1,150 [1],[2],[10],[37]
Interest 5.00% [4],[5],[7],[38] 5.00% [1],[2],[10],[37]
Interest 8.20% [4],[5],[7],[38] 8.20% [1],[2],[10],[37]
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 [1],[2],[3] $ 6,816  
Fair value at ending balance $ 6,849 [4],[5],[30] $ 6,816 [1],[2],[3]
Interest 5.50% [4],[5],[30] 5.50% [1],[2],[3]
Interest 10.20% [4],[5],[30] 9.80% [1],[2],[3]
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 [4],[5],[6] $ 6,203  
Interest [4],[5],[6] 6.50%  
Interest [4],[5],[6] 11.40%  
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[6] $ (33)  
Interest [4],[5],[6] 6.50%  
Interest [4],[5],[6] 11.40%  
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 [1],[2],[3] $ 4,697  
Fair value at ending balance $ 4,687 [4],[5],[30] $ 4,697 [1],[2],[3]
Interest 4.25% [4],[5],[30] 4.25% [1],[2],[3]
Interest 9.20% [4],[5],[30] 8.60% [1],[2],[3]
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 [1],[2],[10],[22] $ 2,084  
Fair value at ending balance $ 2,121 [4],[5],[7],[23] $ 2,084 [1],[2],[10],[22]
Interest 6.25% [4],[5],[7],[23] 6.25% [1],[2],[10],[22]
Interest 9.30% [4],[5],[7],[23] 8.50% [1],[2],[10],[22]
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 [1],[2],[10],[39] $ 16,963  
Fair value at ending balance $ 17,070 [4],[5],[7],[40] $ 16,963 [1],[2],[10],[39]
Interest 6.00% [4],[5],[7],[40] 6.00% [1],[2],[10],[39]
Interest 9.60% [4],[5],[7],[40] 9.60% [1],[2],[10],[39]
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 [2],[20] $ 300  
Fair value at ending balance $ 465 [5],[15] $ 300 [2],[20]
Investment owned, balance (in shares) 4,587.38 [5],[8],[9],[15] 4,587.38 [2],[11],[12],[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 [2],[20] $ 0  
Fair value at ending balance $ 5 [5],[15] $ 0 [2],[20]
Investment owned, balance (in shares) 509.71 [5],[8],[9],[15] 509.71 [2],[11],[12],[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 [1],[2],[17] $ 5,096  
Fair value at ending balance $ 5,370 [4],[5],[30] $ 5,096 [1],[2],[17]
Interest 5.50% [4],[5],[30] 5.50% [1],[2],[17]
Interest 10.70% [4],[5],[30] 10.20% [1],[2],[17]
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 [1],[2],[17] $ 5  
Fair value at ending balance $ 72 [4],[5],[19] $ 5 [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.50% [1],[2],[17]
Interest 10.30% [4],[5],[19] 10.20% [1],[2],[17]
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3] $ 2,649  
Fair value at ending balance [1],[2],[3]   $ 2,649
Interest [1],[2],[3]   5.25%
Interest [1],[2],[3]   9.60%
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 [1],[2],[26] 2,918  
Fair value at ending balance $ 2,312 [4],[5],[27] $ 2,918 [1],[2],[26]
Interest 5.75% [4],[5],[27] 5.25% [1],[2]
Interest 10.50% [4],[5],[27] 9.60% [1],[2]
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 ending balance [4],[5],[6] $ 329  
Interest [4],[5],[6] 6.00%  
Interest [4],[5],[6] 10.70%  
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[6] $ 2,932  
Interest [4],[5],[6] 6.50%  
Interest [4],[5],[6] 11.20%  
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 [4],[5],[7],[33] $ 2,031  
Interest [4],[5],[7],[33] 6.50%  
Interest [4],[5],[7],[33] 9.40%  
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 ending balance [4],[5],[7],[38] $ 1,631  
Interest 5.25% [4],[5],[7],[38] 5.25% [1],[2],[10],[37]
Interest 7.40% [4],[5],[7],[38] 7.40% [1],[2],[10],[37]
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[10],[37] $ 1,508  
Fair value at ending balance [1],[2],[10],[37]   $ 1,508
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[10],[37] 184  
Fair value at ending balance [1],[2],[10],[37]   $ 184
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[7],[38] $ 189  
Interest 5.25% [4],[5],[7],[38] 5.25% [1],[2],[10],[37]
Interest 7.40% [4],[5],[7],[38] 7.40% [1],[2],[10],[37]
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 [1],[2],[17] $ 2,446  
Fair value at ending balance $ 2,443 [4],[5],[6] $ 2,446 [1],[2],[17]
Interest 4.75% [4],[5],[6] 4.75% [1],[2],[17]
Interest 9.90% [4],[5],[6] 9.50% [1],[2],[17]
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 [1],[2],[10],[39] $ 3,406  
Fair value at ending balance $ 3,315 [4],[5],[7],[40] $ 3,406 [1],[2],[10],[39]
Interest 5.25% [4],[5],[7],[40] 5.25% [1],[2],[10],[39]
Interest 8.80% [4],[5],[7],[40] 8.80% [1],[2],[10],[39]
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 [1],[2],[10],[28] $ 443  
Fair value at ending balance $ 425 [4],[5],[7],[29] $ 443 [1],[2],[10],[28]
Interest 5.25% [4],[5],[7],[29] 5.75% [1],[2],[10],[28]
Interest 10.20% [4],[5],[7],[29] 9.60% [1],[2],[10],[28]
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 [1],[2],[3] $ 5,501  
Fair value at ending balance $ 5,496 [4],[5],[6] $ 5,501 [1],[2],[3]
Interest 5.75% [4],[5],[6] 5.75% [1],[2],[3]
Interest 10.60% [4],[5],[6] 10.10% [1],[2],[3]
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 [2],[20] $ 226  
Fair value at ending balance $ 226 [5],[15] $ 226 [2],[20]
Investment owned, balance (in shares) 210,920.11 [5],[8],[9],[15] 210,920.11 [2],[11],[12],[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 [1],[2],[3] $ (21)  
Fair value at ending balance $ (18) [4],[5],[6] $ (21) [1],[2],[3]
Interest 5.75% [4],[5],[6] 5.75% [1],[2],[3]
Interest 10.60% [4],[5],[6] 10.10% [1],[2],[3]
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 [1],[2],[28] $ 3,567  
Fair value at ending balance $ 3,555 [4],[5],[6] $ 3,567 [1],[2],[28]
Interest 5.00% [4],[5],[6] 5.00% [1],[2],[28]
Interest 9.80% [4],[5],[6] 10.00% [1],[2],[28]
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 [1],[2],[28] $ 743  
Fair value at ending balance $ 1,097 [4],[5],[6] $ 743 [1],[2],[28]
Interest 5.00% [4],[5],[6] 5.00% [1],[2],[28]
Interest 9.80% [4],[5],[6] 10.00% [1],[2],[28]
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 [1],[2],[10],[22] $ 3,310  
Fair value at ending balance $ 3,243 [4],[5],[7],[23] $ 3,310 [1],[2],[10],[22]
Interest 5.50% [4],[5],[7],[23] 5.75% [1],[2],[10],[22]
Interest 8.70% [4],[5],[7],[23] 7.90% [1],[2],[10],[22]
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 [1],[2],[17] $ 2,190  
Fair value at ending balance $ 2,190 [4],[5],[19] $ 2,190 [1],[2],[17]
Interest 6.00% [4],[5],[19] 6.00% [1],[2],[17]
Interest 11.00% [4],[5],[19] 10.20% [1],[2],[17]
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 beginning balance [1],[2],[21] $ 2,206  
Fair value at ending balance [1],[2],[21]   $ 2,206
Interest [1],[2],[21]   6.00%
Interest [1],[2],[21]   10.50%
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 ending balance [4],[5],[6] $ 2,206  
Interest [4],[5],[6] 6.00%  
Interest [4],[5],[6] 10.90%  
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[6] $ 4,571  
Interest [4],[5],[6] 6.25%  
Interest [4],[5],[6] 11.10%  
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 [2],[20] $ 221  
Fair value at ending balance $ 360 [5],[15] $ 221 [2],[20]
Investment owned, balance (in shares) 347,497 [5],[8],[9],[15] 60,040 [2],[11],[12],[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 [1],[2],[17] $ (6)  
Fair value at ending balance $ 43 [4],[5],[19] $ (6) [1],[2],[17]
Interest 6.00% [4],[5],[19] 6.00% [1],[2],[17]
Interest 11.00% [4],[5],[19] 10.20% [1],[2],[17]
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 [2],[3],[14] $ 3,627  
Fair value at ending balance $ 3,699 [5],[13],[30] $ 3,627 [2],[3],[14]
Interest 5.00% [5],[13],[30] 5.00% [2],[3],[14]
Interest 9.80% [5],[13],[30] 8.40% [2],[3],[14]
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 [1],[2],[21] $ 5,995  
Fair value at ending balance $ 8,181 [4],[5],[6] $ 5,995 [1],[2],[21]
Interest 5.00% [4],[5],[6] 5.00% [1],[2],[21]
Interest 9.90% [4],[5],[6] 9.70% [1],[2],[21]
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 [1],[2],[10],[54] $ 2,251  
Fair value at ending balance $ 2,229 [4],[5],[7],[31] $ 2,251 [1],[2],[10],[54]
Interest 4.75% [4],[5],[7],[31] 4.75% [1],[2],[10],[54]
Interest 9.00% [4],[5],[7],[31] 9.00% [1],[2],[10],[54]
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 [1],[2],[10],[37] $ 2,753  
Fair value at ending balance $ 2,830 [4],[5],[7],[38] $ 2,753 [1],[2],[10],[37]
Interest 4.75% [4],[5],[7],[38] 4.75% [1],[2],[10],[37]
Interest 7.70% [4],[5],[7],[38] 7.70% [1],[2],[10],[37]
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 [1],[2],[10],[22] $ 342  
Fair value at ending balance $ 351 [4],[5],[7],[23] $ 342 [1],[2],[10],[22]
Interest 5.75% [4],[5],[7],[23] 5.75% [1],[2],[10],[22]
Interest 8.40% [4],[5],[7],[23] 7.70% [1],[2],[10],[22]
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 [1],[2],[10],[17] $ 577  
Fair value at ending balance $ 582 [4],[5],[7],[19] $ 577 [1],[2],[10],[17]
Interest 5.75% [4],[5],[7],[19] 5.75% [1],[2],[10],[17]
Interest 10.70% [4],[5],[7],[19] 10.50% [1],[2],[10],[17]
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 [2],[20] $ 41  
Fair value at ending balance $ 45 [5],[15] $ 41 [2],[20]
Investment owned, balance (in shares) 28.8 [5],[8],[9],[15] 28.8 [2],[11],[12],[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 [1],[2],[17] $ 8,172  
Fair value at ending balance $ 8,162 [4],[5],[19] $ 8,172 [1],[2],[17]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.70% [4],[5],[19] 9.40% [1],[2],[17]
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 [1],[2],[10],[22] $ 829  
Fair value at ending balance $ 825 [4],[5],[7],[23] $ 829 [1],[2],[10],[22]
Interest 5.25% [4],[5],[7],[23] 5.25% [1],[2],[10],[22]
Interest 8.20% [4],[5],[7],[23] 7.30% [1],[2],[10],[22]
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 [1],[2],[10],[17] $ 842  
Fair value at ending balance $ 832 [4],[5],[7],[19] $ 842 [1],[2],[10],[17]
Interest 5.25% [4],[5],[7],[19] 5.25% [1],[2],[10],[17]
Interest 10.30% [4],[5],[7],[19] 10.00% [1],[2],[10],[17]
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 [2] $ 4,628  
Fair value at ending balance $ 4,312 [5] $ 4,628 [2]
Interest 6.90% [5] 6.90% [2]
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 [1],[2],[10],[32] $ 2,638  
Fair value at ending balance $ 2,708 [4],[5],[7],[33] $ 2,638 [1],[2],[10],[32]
Interest 6.50% [4],[5],[7],[33] 5.25% [1],[2],[10],[32]
Interest 8.60% [4],[5],[7],[33] 7.10% [1],[2],[10],[32]
Investment, interest rate, paid in kind 0.75% [4],[5],[7],[33] 0.75% [1],[2],[10],[32]
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 [1],[2],[10],[21] $ 1,455  
Fair value at ending balance $ 1,461 [4],[5],[6],[7] $ 1,455 [1],[2],[10],[21]
Interest 6.50% [4],[5],[6],[7] 6.50% [1],[2],[10],[21]
Interest 10.20% [4],[5],[6],[7] 9.60% [1],[2],[10],[21]
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 [1],[2],[10],[22] $ 2,702  
Fair value at ending balance $ 2,587 [4],[5],[7],[23] $ 2,702 [1],[2],[10],[22]
Interest 6.75% [4],[5],[7],[23] 6.75% [1],[2],[10],[22]
Interest 9.40% [4],[5],[7],[23] 8.50% [1],[2],[10],[22]
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 [1],[2],[10],[17] $ 3,159  
Fair value at ending balance $ 3,169 [4],[5],[7],[19] $ 3,159 [1],[2],[10],[17]
Interest 6.75% [4],[5],[7],[19] 6.75% [1],[2],[10],[17]
Interest 11.40% [4],[5],[7],[19] 11.40% [1],[2],[10],[17]
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 [2],[10] $ 165  
Fair value at ending balance $ 177 [5],[7] $ 165 [2],[10]
Interest 4.70% [5],[7] 4.70% [2],[10]
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 [2],[10] $ 162  
Fair value at ending balance $ 172 [5],[7] $ 162 [2],[10]
Interest 5.40% [5],[7] 5.40% [2],[10]
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 [2],[10] $ 157  
Fair value at ending balance $ 166 [5],[7] $ 157 [2],[10]
Interest 5.90% [5],[7] 5.90% [2],[10]
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 [2],[10] $ 158  
Fair value at ending balance $ 161 [5],[7] $ 158 [2],[10]
Interest 8.50% [5],[7] 8.50% [2],[10]
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 [2],[10] $ 8,154  
Fair value at ending balance $ 8,185 [5],[7] $ 8,154 [2],[10]
Interest 11.40% [5],[7] 11.40% [2],[10]
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 [1],[2],[10],[49] $ 2,728  
Fair value at ending balance $ 2,700 [4],[5],[7],[51] $ 2,728 [1],[2],[10],[49]
Interest 6.00% [4],[5],[7],[51] 6.00% [1],[2],[10],[49]
Interest 9.70% [4],[5],[7],[51] 9.10% [1],[2],[10],[49]
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 [1],[2],[17] $ 1,210  
Fair value at ending balance $ 1,212 [4],[5],[29] $ 1,210 [1],[2],[17]
Interest 4.75% [4],[5],[29] 4.75% [1],[2],[17]
Interest 9.80% [4],[5],[29] 9.60% [1],[2],[17]
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 [2],[20] $ 823  
Fair value at ending balance $ 933 [5],[15] $ 823 [2],[20]
Investment owned, balance (in shares) 7,408.6 [5],[8],[9],[15] 7,408.6 [2],[11],[12],[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 [1],[2],[17] $ (9)  
Fair value at ending balance $ (8) [4],[5],[29] $ (9) [1],[2],[17]
Interest 4.75% [4],[5],[29] 4.75% [1],[2],[17]
Interest 9.80% [4],[5],[29] 9.60% [1],[2],[17]
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 [1],[2],[17] $ 48,490  
Fair value at ending balance $ 49,055 [4],[5],[19] $ 48,490 [1],[2],[17]
Interest 6.00% [4],[5],[19] 6.00% [1],[2],[17]
Interest 10.80% [4],[5],[19] 8.80% [1],[2],[17]
Investment, interest rate, paid in kind 4.00% [4],[5],[19] 4.00% [1],[2],[17]
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 [2],[20] $ 438  
Fair value at ending balance $ 301 [5],[15] $ 438 [2],[20]
Investment owned, balance (in shares) 2.55830 [5],[8],[9],[15] 2.55830 [2],[11],[12],[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 [2],[20] $ 148  
Fair value at ending balance $ 102 [5],[15] $ 148 [2],[20]
Investment owned, balance (in shares) 0.86340 [5],[8],[9],[15] 0.86340 [2],[11],[12],[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 [2],[20] $ 0  
Fair value at ending balance $ 0 [5],[15] $ 0 [2],[20]
Investment owned, balance (in shares) 0.08870 [5],[8],[9],[15] 0.08870 [2],[11],[12],[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 [2],[20] $ 42  
Fair value at ending balance $ 29 [5],[15] $ 42 [2],[20]
Investment owned, balance (in shares) 0.24710 [5],[8],[9],[15] 0.24710 [2],[11],[12],[20]
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 [1],[2],[3],[14] $ 987  
Fair value at ending balance $ 997 [4],[5],[13],[30] $ 987 [1],[2],[3],[14]
Interest 7.00% [4],[5],[13],[30] 7.00% [1],[2],[3],[14]
Interest 11.90% [4],[5],[13],[30] 11.40% [1],[2],[3],[14]
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 [1],[2],[17] $ 12,510  
Fair value at ending balance $ 12,500 [4],[5],[19] $ 12,510 [1],[2],[17]
Interest 6.25% [4],[5],[19] 6.25% [1],[2]
Interest 11.10% [4],[5],[19] 9.90% [1],[2]
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 [1],[2],[10],[32] $ 5,656  
Fair value at ending balance $ 5,758 [4],[5],[7],[33] $ 5,656 [1],[2],[10],[32]
Interest 5.25% [4],[5],[7],[33] 5.75% [1],[2],[10],[32]
Interest 8.00% [4],[5],[7],[33] 8.50% [1],[2],[10],[32]
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 [1],[2],[10],[54] $ 2,719  
Fair value at ending balance $ 2,716 [4],[5],[7],[29] $ 2,719 [1],[2],[10],[54]
Interest 5.25% [4],[5],[7],[29] 5.25% [1],[2],[10],[54]
Interest 10.00% [4],[5],[7],[29] 8.60% [1],[2],[10],[54]
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 [1],[2],[21] $ 4,907  
Fair value at ending balance $ 305 [4],[5],[6] $ 4,907 [1],[2],[21]
Interest 5.75% [4],[5],[6] 5.75% [1],[2],[21]
Interest 10.60% [4],[5],[6] 10.30% [1],[2],[21]
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 [1],[2],[3] $ 304  
Fair value at ending balance $ 4,919 [4],[5],[29] $ 304 [1],[2],[3]
Interest 5.75% [4],[5],[29] 6.00% [1],[2],[3]
Interest 10.90% [4],[5],[29] 10.40% [1],[2],[3]
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 [1],[2],[17] $ 1,751  
Fair value at ending balance $ 1,758 [4],[5],[19] $ 1,751 [1],[2],[17]
Interest 4.50% [4],[5],[19] 4.50% [1],[2],[17]
Interest 9.30% [4],[5],[19] 8.70% [1],[2],[17]
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 [1],[2],[54] $ 1,624  
Fair value at ending balance $ 1,638 [4],[5],[31] $ 1,624 [1],[2],[54]
Interest 5.75% [4],[5],[31] 5.75% [1],[2],[54]
Interest 10.80% [4],[5],[31] 9.60% [1],[2],[54]
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[20] $ 172  
Fair value at ending balance $ 189 [5],[15] $ 172 [2],[20]
Investment owned, balance (in shares) 241,935.48 [5],[8],[9],[15] 241,935.48 [2],[11],[12],[20]
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[54] $ (7)  
Fair value at ending balance $ 175 [4],[5],[31] $ (7) [1],[2],[54]
Interest 5.75% [4],[5],[31] 5.75% [1],[2],[54]
Interest 10.80% [4],[5],[31] 9.60% [1],[2],[54]
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 [2] $ 74  
Fair value at ending balance $ 75 [5] $ 74 [2]
Interest 8.00% [5] 8.00% [2]
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 [2],[14],[20] $ 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14],[20]
Investment owned, balance (in shares) 1,668,106 [5],[8],[9],[13],[15] 1,668,106 [2],[11],[12],[14],[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 [1],[2],[10],[32] $ 1,365  
Fair value at ending balance $ 1,406 [4],[5],[7],[33] $ 1,365 [1],[2],[10],[32]
Interest 6.25% [4],[5],[7],[33] 6.00% [1],[2],[10],[32]
Interest 9.30% [4],[5],[7],[33] 7.70% [1],[2],[10],[32]
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 [1],[2],[10],[32] $ 2,017  
Fair value at ending balance $ 2,049 [4],[5],[7],[33] $ 2,017 [1],[2],[10],[32]
Interest 5.25% [4],[5],[7],[33] 5.25% [1],[2],[10],[32]
Interest 8.30% [4],[5],[7],[33] 7.10% [1],[2],[10],[32]
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 [1],[2],[10],[24] $ 1,821  
Fair value at ending balance $ 1,769 [4],[5],[7],[25] $ 1,821 [1],[2],[10],[24]
Interest 3.75% [4],[5],[7],[25] 5.50% [1],[2],[10],[24]
Interest 7.40% [4],[5],[7],[25] 8.60% [1],[2],[10],[24]
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],[15] $ 3  
Investment owned, balance (in shares) [5],[8],[9],[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 [4],[5],[6] $ 588  
Interest [4],[5],[6] 5.75%  
Interest [4],[5],[6] 10.40%  
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],[15] $ 144  
Investment owned, balance (in shares) [5],[8],[9],[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 [4],[5],[6] $ (7)  
Interest [4],[5],[6] 5.75%  
Interest [4],[5],[6] 10.40%  
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 [1],[2],[10],[17] $ 6,692  
Fair value at ending balance $ 6,727 [4],[5],[7],[19] $ 6,692 [1],[2],[10],[17]
Interest 6.25% [4],[5],[7],[19] 6.25% [1],[2],[10],[17]
Interest 11.30% [4],[5],[7],[19] 11.00% [1],[2],[10],[17]
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 [1],[2],[21] $ 9,873  
Fair value at ending balance $ 10,688 [4],[5],[29] $ 9,873 [1],[2],[21]
Interest 6.25% [4],[5],[29] 6.25% [1],[2],[21]
Interest 11.10% [4],[5],[29] 10.80% [1],[2],[21]
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[21] $ 403  
Fair value at ending balance $ 408 [4],[5],[29] $ 403 [1],[2],[21]
Interest 6.25% [4],[5],[29] 6.25% [1],[2],[21]
Interest 11.10% [4],[5],[29] 10.80% [1],[2],[21]
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 [1],[2],[14],[17] $ 12,658  
Fair value at ending balance $ 12,658 [4],[5],[6],[13] $ 12,658 [1],[2],[14],[17]
Interest 6.75% [4],[5],[6],[13] 6.75% [1],[2],[14],[17]
Interest 11.40% [4],[5],[6],[13] 11.40% [1],[2],[14],[17]
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 [1],[2],[14],[17] $ (25)  
Fair value at ending balance $ 346 [4],[5],[6],[13] $ (25) [1],[2],[14],[17]
Interest 6.75% [4],[5],[6],[13] 6.75% [1],[2],[14],[17]
Interest 11.40% [4],[5],[6],[13] 11.40% [1],[2],[14],[17]
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 [1],[2],[50] $ 9,438  
Fair value at ending balance $ 9,583 [4],[5],[33] $ 9,438 [1],[2],[50]
Interest 4.75% [4],[5],[33] 4.75% [1],[50]
Interest 8.00% [4],[5],[33] 6.60% [1],[50]
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 [1],[2],[17] $ 1,274  
Fair value at ending balance $ 1,410 [4],[5],[30] $ 1,274 [1],[2],[17]
Interest 4.75% [4],[5],[30] 4.75% [1],[2],[17]
Interest 9.90% [4],[5],[30] 9.50% [1],[2],[17]
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 [1],[2],[17] $ 7,144  
Fair value at ending balance $ 7,160 [4],[5],[30] $ 7,144 [1],[2],[17]
Interest 5.50% [4],[5],[30] 5.50% [1],[2],[17]
Interest 10.30% [4],[5],[30] 9.90% [1],[2],[17]
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 [2],[14] $ 1  
Fair value at ending balance $ 0 [5],[13],[15] $ 1 [2],[14]
Investment owned, balance (in shares) 145.347 [5],[8],[9],[13],[15] 145.347 [2],[11],[12],[14]
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 [2],[14],[20] $ 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14],[20]
Investment owned, balance (in shares) 145.347 [5],[8],[9],[13],[15] 145.347 [2],[11],[12],[14],[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 [2],[14],[20] $ 155  
Fair value at ending balance $ 62 [5],[13],[15] $ 155 [2],[14],[20]
Investment owned, balance (in shares) 7,844.03 [5],[8],[9],[13],[15] 7,844.03 [2],[11],[12],[14],[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 [2],[14],[20] $ 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14],[20]
Investment owned, balance (in shares) 153 [5],[8],[9],[13],[15] 153 [2],[11],[12],[14],[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 [1],[2],[14],[26] $ 9,761  
Fair value at ending balance $ 8,815 [4],[5],[13],[27] $ 9,761 [1],[2],[14],[26]
Interest 7.75% [4],[5],[13],[27] 7.75% [1],[2],[14],[26]
Interest 12.10% [4],[5],[13],[27] 12.00% [1],[2],[14],[26]
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 [1],[2],[14],[26] $ 1,480  
Fair value at ending balance $ 2,183 [4],[5],[13],[27] $ 1,480 [1],[2],[14],[26]
Interest 7.75% [4],[5],[13],[27] 7.75% [1],[2],[14],[26]
Interest 12.10% [4],[5],[13],[27] 12.00% [1],[2],[14],[26]
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 [1],[2],[21] $ 12,708  
Fair value at ending balance $ 12,749 [4],[5],[6] $ 12,708 [1],[2],[21]
Interest 6.50% [4],[5],[6] 6.50% [1],[2],[21]
Interest 11.40% [4],[5],[6] 10.60% [1],[2],[21]
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 [2],[20] $ 533  
Fair value at ending balance $ 532 [5],[15] $ 533 [2],[20]
Investment owned, balance (in shares) 5,333 [5],[8],[9],[15] 5,333 [2],[11],[12],[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 [1],[2],[21] $ 238  
Fair value at ending balance $ 304 [4],[5],[6] $ 238 [1],[2],[21]
Interest 6.50% [4],[5],[6] 6.50% [1],[2],[21]
Interest 11.40% [4],[5],[6] 10.60% [1],[2],[21]
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 [1],[2],[17] $ 11,392  
Fair value at ending balance $ 11,501 [4],[5],[6] $ 11,392 [1],[2],[17]
Interest 6.50% [4],[5],[6] 6.50% [1],[2],[17]
Interest 11.30% [4],[5],[6] 10.30% [1],[2],[17]
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 [2],[20] $ 125  
Fair value at ending balance $ 151 [5],[15] $ 125 [2],[20]
Investment owned, balance (in shares) 187,235 [5],[8],[9],[15] 187,235 [2],[11],[12],[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 [1],[2],[17] $ 4,556  
Fair value at ending balance $ 4,204 [4],[5],[19] $ 4,556 [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.50% [1],[2],[17]
Interest 10.40% [4],[5],[19] 10.10% [1],[2],[17]
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 [2],[20] $ 152  
Fair value at ending balance $ 65 [5],[15] $ 152 [2],[20]
Investment owned, balance (in shares) 197,368.42 [5],[8],[9],[15] 197,368.42 [2],[11],[12],[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 [1],[2],[14],[17] $ 4,243  
Fair value at ending balance $ 3,049 [4],[5],[13],[19] $ 4,243 [1],[2],[14],[17]
Interest 8.00% [4],[5],[13],[19] 8.00% [1],[2],[14],[17]
Interest 12.80% [4],[5],[13],[19] 12.40% [1],[2],[14],[17]
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 [1],[2],[17] $ 3,926  
Fair value at ending balance $ 3,967 [4],[5],[19] $ 3,926 [1],[2],[17]
Interest 7.00% [4],[5],[19] 7.00% [1],[2],[17]
Interest 12.30% [4],[5],[19] 11.70% [1],[2],[17]
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 [1],[2],[10],[37] $ 2,840  
Fair value at ending balance $ 2,927 [4],[5],[7],[38] $ 2,840 [1],[2],[10],[37]
Interest 6.25% [4],[5],[7],[38] 6.25% [1],[2],[10],[37]
Interest 8.40% [4],[5],[7],[38] 8.40% [1],[2],[10],[37]
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 [5],[7] $ 9,378  
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 [1],[2],[10],[22] 2,162  
Fair value at ending balance $ 2,107 [4],[5],[7],[23] $ 2,162 [1],[2],[10],[22]
Interest 6.25% [4],[5],[7],[23] 6.25% [1],[2],[10],[22]
Interest 9.30% [4],[5],[7],[23] 8.50% [1],[2],[10],[22]
Investment, Identifier [Axis]: Rocade Holdings LLC, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions 0  
Gross Reductions 0  
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0  
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0  
Fair value at ending balance 0 $ 0
Amount of Interest or Dividends Credited to Income $ 0  
Investment owned, balance (in shares) 23.8  
Investment, Identifier [Axis]: Rocade Holdings LLC, Other Financial, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[15] $ 0  
Investment owned, balance (in shares) [5],[8],[9],[15] 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 [5] $ 45,000  
Investment, interest rate, paid in kind [5] 6.00%  
Investment owned, balance (in shares) [5],[8],[9] 45,000  
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 $ 0  
Gross Additions 45,000  
Gross Reductions 0  
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0  
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0  
Fair value at ending balance 45,000 0
Amount of Interest or Dividends Credited to Income $ 734  
Investment owned, balance (in shares) 45,000  
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 [1],[2],[21] $ 10,808  
Fair value at ending balance $ 10,930 [4],[5],[6] $ 10,808 [1],[2],[21]
Interest 6.00% [4],[5],[6] 6.00% [1],[2],[21]
Interest 10.60% [4],[5],[6] 10.40% [1],[2],[21]
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 [1],[2],[21] $ 377  
Fair value at ending balance $ 380 [4],[5],[6] $ 377 [1],[2],[21]
Interest 6.00% [4],[5],[6] 6.00% [1],[2],[21]
Interest 10.60% [4],[5],[6] 10.40% [1],[2],[21]
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 [1],[2],[17] $ 9,238  
Fair value at ending balance $ 9,171 [4],[5],[19] $ 9,238 [1],[2],[17]
Interest 6.00% [4],[5],[19] 6.00%
Interest 11.20% [4],[5],[19] 10.70%
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 [4],[5],[6] $ 11,978  
Interest [4],[5],[6] 6.75%  
Interest [4],[5],[6] 11.60%  
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 [4],[5],[6] $ 140  
Interest [4],[5],[6] 6.75%  
Interest [4],[5],[6] 11.60%  
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 [1],[2],[17] $ 6,376  
Fair value at ending balance $ 6,623 [4],[5],[19] $ 6,376 [1],[2],[17]
Interest 5.25% [4],[5],[19] 5.50% [1],[2],[17]
Interest 10.40% [4],[5],[19] 10.20% [1],[2],[17]
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 [2],[14],[20] $ 110  
Fair value at ending balance $ 110 [5],[13],[15] $ 110 [2],[14],[20]
Investment owned, balance (in shares) 1,000,000 [5],[8],[9],[13],[15] 1,000,000 [2],[11],[12],[14],[20]
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 [1],[2],[17] $ 10,951  
Fair value at ending balance $ 10,938 [4],[5],[6] $ 10,951 [1],[2],[17]
Interest 5.75% [4],[5],[6] 5.75% [1],[2],[17]
Interest 10.50% [4],[5],[6] 10.00% [1],[2],[17]
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 [1],[2],[21] $ 22,041  
Fair value at ending balance $ 22,072 [4],[5],[6] $ 22,041 [1],[2],[21]
Interest 6.25% [4],[5],[6] 6.25% [1],[2],[21]
Interest 11.40% [4],[5],[6] 10.40% [1],[2],[21]
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 [2],[20] $ 516  
Fair value at ending balance $ 519 [5],[15] $ 516 [2],[20]
Investment owned, balance (in shares) 516,399 [5],[8],[9],[15] 516,399 [2],[11],[12],[20]
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 [1],[2],[21] $ (50)  
Fair value at ending balance $ (47) [4],[5],[6] $ (50) [1],[2],[21]
Interest 6.25% [4],[5],[6] 6.25% [1],[2],[21]
Interest 11.40% [4],[5],[6] 10.40% [1],[2],[21]
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 [1],[2],[10],[34] $ 2,383  
Fair value at ending balance $ 2,468 [4],[5],[7],[35] $ 2,383 [1],[2],[10],[34]
Interest 6.25% [4],[5],[7],[35] 6.50% [1],[2],[10],[34]
Interest 10.20% [4],[5],[7],[35] 9.40% [1],[2],[10],[34]
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 [1],[2],[17] $ 11,792  
Fair value at ending balance $ 11,785 [4],[5],[19] $ 11,792 [1],[2],[17]
Interest 6.00% [4],[5],[19] 6.00% [1],[2],[17]
Interest 11.20% [4],[5],[19] 11.20% [1],[2],[17]
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 [2],[20] $ 460  
Fair value at ending balance $ 491 [5],[15] $ 460 [2],[20]
Investment owned, balance (in shares) 372.1 [5],[8],[9],[15] 372.1 [2],[11],[12],[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 [1],[2],[10],[32] $ 1,939  
Fair value at ending balance $ 2,498 [4],[5],[7],[33] $ 1,939 [1],[2],[10],[32]
Interest 5.50% [4],[5],[7],[33] 5.50% [1],[2],[10],[32]
Interest 8.50% [4],[5],[7],[33] 8.20% [1],[2],[10],[32]
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 [1],[2],[10],[60] $ 3,886  
Fair value at ending balance $ 3,943 [4],[5],[7],[61] $ 3,886 [1],[2],[10],[60]
Interest 5.50% [4],[5],[7],[61] 5.50% [1],[2],[10],[60]
Interest 5.90% [4],[5],[7],[61] 5.90% [1],[2],[10],[60]
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 [1],[2],[21] $ 1,716  
Fair value at ending balance $ 1,706 [4],[5],[6] $ 1,716 [1],[2],[21]
Interest 5.50% [4],[5],[6] 5.50% [1],[2],[21]
Interest 10.50% [4],[5],[6] 10.20% [1],[2],[21]
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 [1],[2],[21] $ (3)  
Fair value at ending balance $ (4) [4],[5],[6] $ (3) [1],[2],[21]
Interest 5.50% [4],[5],[6] 5.50% [1],[2],[21]
Interest 10.50% [4],[5],[6] 10.20% [1],[2],[21]
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 [1],[2],[10],[22] $ 6,310  
Fair value at ending balance $ 6,477 [4],[5],[7],[33] $ 6,310 [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[33] 6.00% [1],[2],[10]
Interest 9.20% [4],[5],[7],[33] 8.00% [1],[2],[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 [1],[2],[10],[22] $ (21)  
Fair value at ending balance $ (15) [4],[5],[7],[33] $ (21) [1],[2],[10],[22]
Interest 6.00% [4],[5],[7],[33] 6.00% [1],[2],[10]
Interest 9.20% [4],[5],[7],[33] 8.00% [1],[2],[10]
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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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, Controlled    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 6,020 $ 0
Gross Additions 0 6,020
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 0
Fair value at ending balance 6,020 6,020
Amount of Interest or Dividends Credited to Income $ 75 $ 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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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 0
Gross Additions 0 560
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (108) 15
Fair value at ending balance 467 575
Amount of Interest or Dividends Credited to Income $ 0 $ 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 $ 0
Gross Additions 0 38,753
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (10,076) 14,975
Fair value at ending balance 43,652 53,728
Amount of Interest or Dividends Credited to Income $ 0 $ 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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   (813)
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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 $ 0
Gross Additions 146 10,534
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0 0
Fair value at ending balance 10,680 10,534
Amount of Interest or Dividends Credited to Income $ 93 $ 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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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 $ 0
Gross Additions 0 7,795
Gross Reductions 0 (4,975)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 (988)
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 37 183
Fair value at ending balance 2,052 2,015
Amount of Interest or Dividends Credited to Income $ 81 $ 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 [2],[10],[47] $ 6,020  
Fair value at ending balance $ 6,020 [5],[7],[48] $ 6,020 [2],[10],[47]
Investment, interest rate, paid in kind 5.00% [5],[7],[48] 5.00% [2],[10],[47]
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 [2],[10],[20],[47] $ 575  
Fair value at ending balance $ 467 [5],[7],[15],[48] $ 575 [2],[10],[20],[47]
Investment owned, balance (in shares) 17,100 [5],[7],[8],[9],[15],[48] 17,100 [2],[10],[11],[12],[20],[47]
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 [2],[10],[20],[47] $ 53,728  
Fair value at ending balance $ 43,652 [5],[7],[15],[48] $ 53,728 [2],[10],[20],[47]
Investment owned, balance (in shares) 1,236 [5],[7],[8],[9],[15],[48] 1,236 [2],[10],[11],[12],[20],[47]
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 [2],[10],[47] $ 10,534  
Fair value at ending balance $ 10,680 [5],[7],[48] $ 10,534 [2],[10],[47]
Investment, interest rate, paid in kind 3.10% [5],[7],[48] 3.10% [2],[10],[47]
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 [2],[10],[47] $ 2,015  
Fair value at ending balance $ 2,052 [5],[7],[48] $ 2,015 [2],[10],[47]
Interest 6.00% [5],[7],[48] 6.00% [2],[10],[47]
Investment, interest rate, paid in kind 9.00% [5],[7],[48] 9.00% [2],[10],[47]
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 [1],[2],[10],[32] $ 348  
Fair value at ending balance $ 406 [4],[5],[7],[33] $ 348 [1],[2],[10],[32]
Interest 5.75% [4],[5],[7],[33] 5.75% [1],[2],[10],[32]
Interest 8.20% [4],[5],[7],[33] 8.20% [1],[2],[10],[32]
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 [1],[2],[10],[32] $ 479  
Fair value at ending balance $ 476 [4],[5],[7],[33] $ 479 [1],[2],[10],[32]
Interest 5.75% [4],[5],[7],[33] 5.75% [1],[2],[10],[32]
Interest 8.20% [4],[5],[7],[33] 8.20% [1],[2],[10],[32]
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 [1],[17] $ 7,148  
Fair value at ending balance $ 7,105 [4],[19] $ 7,148 [1],[17]
Interest 7.50% [4],[19] 7.50% [1],[17]
Interest 12.30% [4],[19] 12.30% [1],[17]
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 [1],[17] $ 1,625  
Fair value at ending balance $ 2,016 [4],[18],[19] $ 1,625 [1],[17]
Interest 7.50% [4],[18],[19] 7.50% [1],[17]
Interest [1],[17]   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 [2],[10],[20] $ 1,200  
Fair value at ending balance [2],[10],[20]   $ 1,200
Investment owned, balance (in shares) [2],[10],[11],[12],[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 [1],[2],[10],[21] 33,720  
Fair value at ending balance [1],[2],[10],[21]   $ 33,720
Interest [1],[2],[10],[21]   6.00%
Interest [1],[2],[10],[21]   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 [5],[7],[15] $ 1,200  
Investment owned, balance (in shares) [5],[7],[8],[9],[15] 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 [4],[5],[6],[7] $ 33,759  
Interest [4],[5],[6],[7] 6.00%  
Interest [4],[5],[6],[7] 10.70%  
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 [10],[14] $ 37,950  
Fair value at ending balance 39,814 [7],[13] $ 37,950 [10],[14]
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 85,963
Gross Reductions 0 (35,742)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 1,864 (12,271)
Fair value at ending balance 39,814 37,950
Amount of Interest or Dividends Credited to Income 1,204 4,526
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 [1],[2],[3] 13,393  
Fair value at ending balance $ 13,297 [4],[5],[30] $ 13,393 [1],[2],[3]
Interest 5.75% [4],[5],[30] 5.75% [1],[2],[3]
Interest 10.60% [4],[5],[30] 10.10% [1],[2],[3]
Investment, Identifier [Axis]: Smartling, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3] $ (24)  
Fair value at ending balance $ (28) [4],[5],[30] $ (24) [1],[2],[3]
Interest 5.75% [4],[5],[30] 5.75% [1],[2],[3]
Interest 10.60% [4],[5],[30] 10.10% [1],[2],[3]
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 [1],[2],[54] $ 4,196  
Fair value at ending balance $ 4,131 [4],[5],[19] $ 4,196 [1],[2],[54]
Interest 4.50% [4],[5],[19] 4.50% [1],[2],[54]
Interest 9.30% [4],[5],[19] 7.90% [1],[2],[54]
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 [1],[2],[54] $ 565  
Fair value at ending balance $ 560 [4],[5],[19] $ 565 [1],[2],[54]
Interest 4.50% [4],[5],[19] 4.50% [1],[2],[54]
Interest 9.30% [4],[5],[19] 7.90% [1],[2],[54]
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 [2],[10] $ 5,616  
Fair value at ending balance $ 5,777 [5] $ 5,616 [2],[10]
Investment, interest rate, paid in kind 9.50% [5] 9.50% [2],[10]
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 [10],[14] $ 1,192  
Fair value at ending balance 848 [7],[13] $ 1,192 [10],[14]
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 [1],[2],[21] 1,621  
Fair value at ending balance $ 1,889 [4],[5],[6] $ 1,621 [1],[2],[21]
Interest 5.00% [4],[5],[6] 5.00% [1],[2],[21]
Interest 9.90% [4],[5],[6] 9.60% [1],[2],[21]
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 [1],[2],[21] $ (4)  
Fair value at ending balance $ 13 [4],[5],[57] $ (4) [1],[2],[21]
Interest 4.00% [4],[5],[57] 5.00% [1],[2],[21]
Interest 12.00% [4],[5],[57] 9.60% [1],[2],[21]
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 [1],[2],[26] $ 5,754  
Fair value at ending balance $ 5,810 [4],[5],[27] $ 5,754 [1],[2],[26]
Interest 5.00% [4],[5],[27] 5.50% [1],[2],[26]
Interest 9.80% [4],[5],[27] 9.70% [1],[2],[26]
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 [1],[2],[26] $ (35)  
Fair value at ending balance $ (29) [4],[5],[27] $ (35) [1],[2],[26]
Interest 5.00% [4],[5],[27] 5.50% [1],[2],[26]
Interest 9.80% [4],[5],[27] 9.70% [1],[2],[26]
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 [1],[2],[3] $ 20,510  
Fair value at ending balance $ 20,493 [4],[5],[6] $ 20,510 [1],[2],[3]
Interest 5.75% [4],[5],[6] 5.75% [1],[2],[3]
Interest 10.70% [4],[5],[6] 10.10% [1],[2],[3]
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 [1],[2],[21] $ 2,763  
Fair value at ending balance $ 2,761 [4],[5],[29] $ 2,763 [1],[2],[21]
Interest 6.50% [4],[5],[29] 6.50% [1],[2],[21]
Interest 11.30% [4],[5],[29] 11.10% [1],[2],[21]
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 [1],[2],[10],[17] $ 2,477  
Fair value at ending balance $ 2,480 [4],[5],[6],[7] $ 2,477 [1],[2],[10],[17]
Interest 6.40% [4],[5],[6],[7] 6.30% [1],[2],[10],[17]
Interest 11.20% [4],[5],[6],[7] 10.70% [1],[2],[10],[17]
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 [1],[2],[17] $ 12,860  
Fair value at ending balance $ 12,858 [4],[5],[19] $ 12,860 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.70% [4],[5],[19] 10.50% [1],[2],[17]
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[17] $ (26)  
Fair value at ending balance $ (21) [4],[5],[19] $ (26) [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.70% [4],[5],[19] 10.50% [1],[2],[17]
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 [2] $ 6,515  
Fair value at ending balance $ 7,197 [5] $ 6,515 [2]
Investment, interest rate, paid in kind 12.50% [5] 12.50% [2]
Investment owned, balance (in shares) 7,575,758 [5],[8],[9] 7,575,758 [2],[11],[12]
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 [1],[2],[3],[10] $ 1,812  
Fair value at ending balance $ 1,819 [4],[5],[7],[30] $ 1,812 [1],[2],[3],[10]
Interest 5.75% [4],[5],[7],[30] 5.75% [1],[2],[3],[10]
Interest 10.60% [4],[5],[7],[30] 10.10% [1],[2],[3],[10]
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[10] $ 622  
Fair value at ending balance $ 759 [4],[5],[7],[30] $ 622 [1],[2],[3],[10]
Interest 5.75% [4],[5],[7],[30] 5.75% [1],[2],[3],[10]
Interest 10.60% [4],[5],[7],[30] 10.10% [1],[2],[3],[10]
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 [2],[20] $ 60  
Fair value at ending balance $ 61 [5],[15] $ 60 [2],[20]
Investment owned, balance (in shares) 1,589 [5],[8],[9],[15] 1,589 [2],[11],[12],[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 [2] $ 2,110  
Fair value at ending balance $ 2,233 [5] $ 2,110 [2]
Investment, interest rate, paid in kind 7.80% [5] 7.80% [2]
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 [1],[2],[10],[34] $ 1,557  
Fair value at ending balance $ 1,611 [4],[5],[7],[35] $ 1,557 [1],[2],[10],[34]
Interest 6.25% [4],[5],[7],[35] 6.25% [1],[2],[10],[34]
Interest 9.70% [4],[5],[7],[35] 8.40% [1],[2],[10],[34]
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 [1],[2],[10] $ 11,118  
Fair value at ending balance $ 11,700 [4],[5],[7] $ 11,118 [1],[2],[10]
Investment, interest rate, paid in kind 9.30% [4],[5],[7] 9.30% [1],[2],[10]
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 [1],[2],[21] $ 591  
Fair value at ending balance $ 595 [4],[5],[6] $ 591 [1],[2],[21]
Interest 4.75% [4],[5],[6] 4.75% [1],[21],[52]
Interest 10.40% [4],[5],[6] 9.20% [1],[21],[52]
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 [2],[20] $ 5  
Fair value at ending balance $ 5 [5],[15] $ 5 [2],[20]
Investment owned, balance (in shares) 4,673 [5],[8],[9],[15] 4,673 [2],[11],[12],[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 [1],[2],[21] $ (4)  
Fair value at ending balance $ (3) [4],[5],[6] $ (4) [1],[2],[21]
Interest 4.75% [4],[5],[6] 4.75% [1],[21],[52]
Interest 10.40% [4],[5],[6] 9.20% [1],[21],[52]
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 [1],[2],[26] $ 10,877  
Fair value at ending balance $ 10,906 [4],[5],[27] $ 10,877 [1],[2],[26]
Interest 5.75% [4],[5],[27] 5.75% [1],[2],[26]
Interest 10.70% [4],[5],[27] 10.20% [1],[2],[26]
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 [1],[2],[26] $ 157  
Fair value at ending balance $ 234 [4],[5],[27] $ 157 [1],[2],[26]
Interest 5.75% [4],[5],[27] 5.75% [1],[2],[26]
Interest 10.70% [4],[5],[27] 10.20% [1],[2],[26]
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 [1],[2],[14],[17] $ 11,970  
Fair value at ending balance $ 11,598 [4],[5],[13],[19] $ 11,970 [1],[2],[14],[17]
Interest 7.50% [4],[5],[13],[19] 8.00% [1],[2],[14],[17]
Interest 12.30% [4],[5],[13],[19] 11.80% [1],[2],[14],[17]
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 [1],[2],[14],[54] $ 9,345  
Fair value at ending balance $ 9,518 [4],[13],[31] $ 9,345 [1],[2],[14],[54]
Interest 5.00% [4],[13],[31] 5.00% [1],[2],[14],[54]
Interest 9.90% [4],[13],[31] 9.90% [1],[2],[14],[54]
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 [1],[2],[14],[54] $ 4,700  
Fair value at ending balance $ 4,700 [4],[5],[13],[31] $ 4,700 [1],[2],[14],[54]
Interest 9.00% [4],[5],[13],[31] 9.00% [1],[2],[14],[54]
Interest 13.90% [4],[5],[13],[31] 13.90% [1],[2],[14],[54]
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 [1],[2],[10],[22] $ 3,578  
Fair value at ending balance $ 3,695 [4],[5],[7],[23] $ 3,578 [1],[2],[10],[22]
Interest 5.50% [4],[5],[7],[23] 5.50% [1],[2],[10],[22]
Interest 8.70% [4],[5],[7],[23] 7.90% [1],[2],[10],[22]
Investment, Identifier [Axis]: Techone B.V., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[10],[22] $ 281  
Fair value at ending balance $ 194 [4],[5],[7],[23] $ 281 [1],[2],[10],[22]
Interest 5.50% [4],[5],[7],[23] 5.50% [1],[2],[10],[22]
Interest 8.70% [4],[5],[7],[23] 7.90% [1],[2],[10],[22]
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 [1],[2],[17] $ 871  
Fair value at ending balance $ 870 [4],[5],[19] $ 871 [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.00% [1],[2],[17]
Interest 10.20% [4],[5],[19] 9.70% [1],[2],[17]
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 [1],[2],[17] $ 5,368  
Fair value at ending balance $ 5,363 [4],[5],[19] $ 5,368 [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.00% [1],[2],[17]
Interest 10.20% [4],[5],[19] 9.70% [1],[2],[17]
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 [1],[2],[17] $ (13)  
Fair value at ending balance $ (11) [4],[5],[19] $ (13) [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.00% [1],[2],[17]
Interest 10.20% [4],[5],[19] 9.70% [1],[2],[17]
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 [2],[20] $ 255  
Fair value at ending balance $ 230 [5],[15] $ 255 [2],[20]
Investment owned, balance (in shares) 24,358.97 [5],[8],[9],[15] 24,358.97 [2],[11],[12],[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 [2] $ 259  
Fair value at ending balance $ 262 [5] $ 259 [2]
Interest 10.00% [5] 10.00% [2]
Investment, interest rate, paid in kind 4.00% [5] 4.00% [2]
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 [1],[2],[17] $ 798  
Fair value at ending balance $ 794 [4],[5],[19] $ 798 [1],[2],[17]
Interest 4.25% [4],[5],[19] 4.25% [1],[2],[17]
Interest 9.20% [4],[5],[19] 9.00% [1],[2],[17]
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 [1],[2],[17] $ (9)  
Fair value at ending balance $ (10) [4],[5],[19] $ (9) [1],[2],[17]
Interest 4.25% [4],[5],[19] 4.25% [1],[2],[17]
Interest 9.20% [4],[5],[19] 9.00% [1],[2],[17]
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 [1],[2],[54] $ 3,380  
Fair value at ending balance $ 3,388 [4],[5],[31] $ 3,380 [1],[2],[54]
Interest 7.75% [4],[5],[31] 7.75% [1],[2],[54]
Interest 12.70% [4],[5],[31] 12.70% [1],[2],[54]
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 [1],[2],[26] $ 25,979  
Fair value at ending balance $ 25,512 [4],[5],[27] $ 25,979 [1],[2],[26]
Interest 5.50% [4],[5],[27] 5.75% [1],[2],[26]
Interest 10.40% [4],[5],[27] 10.10% [1],[2],[26]
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[27] $ (49)  
Interest [4],[5],[27] 5.50%  
Interest [4],[5],[27] 10.40%  
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 [2] $ 5,547  
Fair value at ending balance $ 5,875 [5] $ 5,547 [2]
Investment, interest rate, paid in kind 11.00% [5] 11.00% [2]
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 [1],[2],[3] $ 1,578  
Fair value at ending balance $ 1,911 [4],[5],[30] $ 1,578 [1],[2],[3]
Interest 5.50% [4],[5],[30] 5.50% [1],[2],[3]
Interest 10.30% [4],[5],[30] 9.90% [1],[2],[3]
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 [1],[2],[3] $ 5,560  
Fair value at ending balance $ 5,558 [4],[5],[30] $ 5,560 [1],[2],[3]
Interest 5.75% [4],[5],[30] 5.75% [1],[2],[3]
Interest 10.60% [4],[5],[30] 10.10% [1],[2],[3]
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 [1],[2],[3] $ 14,178  
Fair value at ending balance $ 14,172 [4],[5],[30] $ 14,178 [1],[2],[3]
Interest 5.75% [4],[5],[30] 5.75% [1],[2],[3]
Interest 10.60% [4],[5],[30] 10.10% [1],[2],[3]
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 [2],[20] $ 1,019  
Fair value at ending balance $ 951 [5],[15] $ 1,019 [2],[20]
Investment owned, balance (in shares) 676,880.98 [5],[8],[9],[15] 676,880.98 [2],[11],[12],[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 [1],[2],[21] $ 12,322  
Fair value at ending balance $ 12,355 [4],[5],[6] $ 12,322 [1],[2],[21]
Interest 7.50% [4],[5],[6] 7.50% [1],[2],[21]
Interest 12.40% [4],[5],[6] 12.10% [1],[2],[21]
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 $ 30,339  
Fair value at ending balance 22,024 [15] $ 30,339
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 0
Gross Reductions (9,106) (32,793)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 791 (21,306)
Fair value at ending balance 22,024 30,339
Amount of Interest or Dividends Credited to Income 0 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 [1],[17] 5,801  
Fair value at ending balance $ 5,742 [4],[19] $ 5,801 [1],[17]
Interest 6.00% [4],[19] 6.00% [1],[17]
Interest 11.00% [4],[19] 10.70% [1],[17]
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 [1],[2],[17] $ 3,561  
Fair value at ending balance $ 3,605 [4],[5],[19] $ 3,561 [1],[2],[17]
Interest 6.00% [4],[5],[19] 6.00% [1],[2],[17]
Interest 11.00% [4],[5],[19] 10.70% [1],[2],[17]
Investment, interest rate, paid in kind 5.00% [4],[5],[19] 5.00% [1],[2],[17]
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 [1],[2],[10],[62] $ 4,486  
Fair value at ending balance $ 4,502 [4],[5],[7],[63] $ 4,486 [1],[2],[10],[62]
Interest 6.75% [4],[5],[7],[63] 6.75% [1],[2],[10],[62]
Interest 11.70% [4],[5],[7],[63] 11.60% [1],[2],[10],[62]
Investment, Identifier [Axis]: Trader Corporation, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[10],[62] $ (9)  
Fair value at ending balance $ (8) [4],[5],[7],[63] $ (9) [1],[2],[10],[62]
Interest 6.75% [4],[5],[7],[63] 6.75% [1],[2],[10],[62]
Interest 11.70% [4],[5],[7],[63] 11.60% [1],[2],[10],[62]
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 [1],[2],[54] $ 5,872  
Fair value at ending balance $ 6,035 [4],[5],[29] $ 5,872 [1],[2],[54]
Interest 4.75% [4],[5],[29] 5.00% [1],[2],[54]
Interest 9.30% [4],[5],[29] 7.90% [1],[2],[54]
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 [1],[2],[17] $ 11,032  
Fair value at ending balance $ 11,026 [4],[5],[19] $ 11,032 [1],[2],[17]
Interest 4.25% [4],[5],[19] 4.25% [1],[2],[17]
Interest 9.20% [4],[5],[19] 8.70% [1],[2],[17]
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 [1],[2] $ 14,570  
Fair value at ending balance $ 14,548 [4],[5],[19] $ 14,570 [1],[2]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.90% [4],[5],[19] 9.50% [1],[2],[17]
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 [1],[2],[21] $ 18,756  
Fair value at ending balance $ 18,967 [4],[5],[6] $ 18,756 [1],[2],[21]
Interest 6.25% [4],[5],[6] 6.25% [1],[2],[21]
Interest 11.10% [4],[5],[6] 11.10% [1],[2],[21]
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 [2],[14] $ 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14]
Investment owned, balance (in shares) 2.71 [5],[8],[9],[13],[15] 2.71 [2],[11],[12],[14]
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 [2],[14],[20] $ 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14],[20]
Investment owned, balance (in shares) 2.8 [5],[8],[9],[13],[15] 2.8 [2],[11],[12],[14],[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 [2],[20] $ 512  
Fair value at ending balance $ 888 [5] $ 512 [2],[20]
Investment owned, balance (in shares) 440.97 [5],[8],[9] 440.97 [2],[11],[12],[20]
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 [1],[2],[54] $ 3,075  
Fair value at ending balance $ 3,752 [4],[5],[19] $ 3,075 [1],[2],[54]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[54]
Interest 9.50% [4],[5],[19] 9.90% [1],[2],[54]
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 [1],[2],[17] $ 3,750  
Fair value at ending balance $ 3,078 [4],[5],[19] $ 3,750 [1],[2],[17]
Interest 5.00% [4],[5],[19] 5.00% [1],[2],[17]
Interest 9.70% [4],[5],[19] 9.60% [1],[2],[17]
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 [1],[2],[17] $ 8,061  
Fair value at ending balance $ 8,170 [4],[5],[19] $ 8,061 [1],[2],[17]
Interest 6.00% [4],[5],[19] 6.00% [1],[2],[17]
Interest 11.20% [4],[5],[19] 10.70% [1],[2],[17]
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 [1],[2],[21] $ 4,900  
Fair value at ending balance $ 4,899 [4],[5],[6] $ 4,900 [1],[2],[21]
Interest 5.75% [4],[5],[6] 6.25% [1],[2],[21]
Interest 10.60% [4],[5],[6] 9.20% [1],[2],[21]
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 [1],[3],[10] $ 1,439  
Fair value at ending balance [1],[3],[10]   $ 1,439
Interest [1],[3],[10]   4.00%
Interest [1],[3],[10]   8.40%
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 [1],[2],[10],[34] 9,677  
Fair value at ending balance $ 9,958 [4],[5],[7],[35] $ 9,677 [1],[2],[10],[34]
Interest 4.50% [4],[5],[7],[35] 7.25% [1],[2],[10],[34]
Interest 4.50% [4],[5],[7],[35] 10.80% [1],[2],[10],[34]
Investment, interest rate, paid in kind [4],[5],[7],[35] 3.40%  
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 [1],[2],[21] $ 15,390  
Fair value at ending balance $ 15,488 [4],[5],[6] $ 15,390 [1],[2],[21]
Interest 5.75% [4],[5],[6] 5.75% [1],[2],[21]
Interest 10.70% [4],[5],[6] 10.50% [1],[2],[21]
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 [1],[2],[10],[34] $ 847  
Fair value at ending balance $ 853 [4],[5],[7],[35] $ 847 [1],[2],[10],[34]
Interest 5.75% [4],[5],[7],[35] 5.75% [1],[2],[10],[34]
Interest 10.00% [4],[5],[7],[35] 9.20% [1],[2],[10],[34]
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 [1],[2],[10],[32] $ 1,180  
Fair value at ending balance $ 1,686 [4],[5],[7],[33] $ 1,180 [1],[2],[10],[32]
Interest 5.50% [4],[5],[7],[33] 5.50% [1],[2],[10],[32]
Interest 8.20% [4],[5],[7],[33] 8.30% [1],[2],[10],[32]
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 [4],[5],[7],[23] $ 1,983  
Interest [4],[5],[7],[23] 6.25%  
Interest [4],[5],[7],[23] 9.20%  
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[7],[23] $ 1,584  
Interest [4],[5],[7],[23] 4.50%  
Interest [4],[5],[7],[23] 7.50%  
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 [1],[2],[10],[22] $ 1,585  
Fair value at ending balance $ 943 [4],[5],[7],[19] $ 1,585 [1],[2],[10],[22]
Interest 5.25% [4],[5],[7],[19] 6.00% [1],[2],[10],[22]
Interest 10.40% [4],[5],[7],[19] 8.20% [1],[2],[10],[22]
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 [1],[2],[10],[17] $ 3,483  
Fair value at ending balance $ 2,476 [4],[5],[7],[19] $ 3,483 [1],[2],[10],[17]
Interest 6.00% [4],[5],[7],[19] 5.25% [1],[2],[10],[17]
Interest 11.20% [4],[5],[7],[19] 8.90% [1],[2],[10],[17]
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 [10],[14] $ 91  
Fair value at ending balance 73 [7],[13],[15] $ 91 [10],[14]
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 [10],[14] 1,551  
Fair value at ending balance 1,085 [7],[13] 1,551 [10],[14]
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 [1],[2],[3] 4,673  
Fair value at ending balance $ 4,716 [4],[5],[30] $ 4,673 [1],[2],[3]
Interest 4.75% [4],[5],[30] 4.75% [1],[2],[3]
Interest 9.60% [4],[5],[30] 9.10% [1],[2],[3]
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 [2],[14],[20] $ 2  
Fair value at ending balance $ 2 [5],[13],[15] $ 2 [2],[14],[20]
Investment owned, balance (in shares) 4,676 [5],[8],[9],[13],[15] 4,676 [2],[11],[12],[14],[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 [2],[14],[20] $ 3  
Fair value at ending balance $ 3 [5],[13],[15] $ 3 [2],[14],[20]
Investment owned, balance (in shares) 5,591 [5],[8],[9],[13],[15] 5,591 [2],[11],[12],[14],[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 [1],[2],[7],[37] $ 3,238  
Fair value at ending balance [7] $ 3,646 [4],[5],[38] $ 3,238 [1],[2],[37]
Interest [7] 6.50% [4],[5],[38] 6.50% [1],[2],[37]
Interest [7] 9.90% [4],[5],[38] 7.70% [1],[2],[37]
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 [1],[2],[10],[34] $ 407  
Fair value at ending balance [1],[2],[10],[34]   $ 407
Interest [1],[2],[10],[34]   6.50%
Interest [1],[2],[10],[34]   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 [1],[14],[17] 4,771  
Fair value at ending balance $ 5,121 [4],[13],[19] $ 4,771 [1],[14],[17]
Interest 7.25% [4],[13],[19] 7.25% [1],[14],[17]
Interest 12.10% [4],[13],[19] 11.60% [1],[14],[17]
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 [2] $ 3,792  
Fair value at ending balance $ 3,602 [5] $ 3,792 [2]
Interest 6.30% [5] 6.30% [2]
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 [1],[2],[17] $ 7,645  
Fair value at ending balance $ 7,377 [4],[5],[19] $ 7,645 [1],[2],[17]
Interest 5.50% [4],[5],[19] 5.50% [1],[2],[17]
Interest 10.50% [4],[5],[19] 10.20% [1],[2],[17]
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 [2],[20] $ 293  
Fair value at ending balance $ 310 [5],[15] $ 293 [2],[20]
Investment owned, balance (in shares) 16,442.9 [5],[8],[9],[15] 16,442.9 [2],[11],[12],[20]
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 [1],[2],[17] $ 3,302  
Fair value at ending balance $ 5,769 [4],[5],[19] $ 3,302 [1],[2],[17]
Interest 5.25% [4],[5],[19] 4.75% [1],[2],[17]
Interest 10.20% [4],[5],[19] 9.50% [1],[2],[17]
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 [1],[2],[21] $ 13,937  
Fair value at ending balance $ 13,974 [4],[5],[6] $ 13,937 [1],[2],[21]
Interest 6.00% [4],[5],[6] 6.00% [1],[2],[21]
Interest 10.80% [4],[5],[6] 10.60% [1],[2],[21]
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 [1],[2],[21] $ 1,056  
Fair value at ending balance $ 1,066 [4],[5],[6] $ 1,056 [1],[2],[21]
Interest 6.00% [4],[5],[6] 6.00% [1],[2],[21]
Interest 10.80% [4],[5],[6] 10.60% [1],[2],[21]
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 [10] $ 20,212  
Fair value at ending balance 19,021 [7] $ 20,212 [10]
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 0 8,800
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (1,191) (2,089)
Fair value at ending balance 19,021 20,212
Amount of Interest or Dividends Credited to Income 720 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 [2],[14],[20] 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14],[20]
Investment owned, balance (in shares) 2,819.53 [5],[8],[9],[13],[15] 2,819.53 [2],[11],[12],[14],[20]
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 [2],[14],[20] $ 0  
Fair value at ending balance $ 0 [5],[13],[15] $ 0 [2],[14],[20]
Investment owned, balance (in shares) [5],[8],[9],[13],[15] 0.0162  
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 [14],[17] $ 33  
Fair value at ending balance $ 30 [13],[18],[19] $ 33 [14],[17]
Interest 4.75% [13],[18],[19] 4.75% [14],[17]
Interest [14],[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 [2] $ 13,153  
Fair value at ending balance $ 12,967 [5] $ 13,153 [2]
Interest 12.00% [5] 12.00% [2]
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 [4],[5],[6] $ 12,170  
Interest [4],[5],[6] 7.00%  
Interest [4],[5],[6] 11.90%  
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],[15] $ 631  
Investment owned, balance (in shares) [5],[8],[9],[15] 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 [4],[5],[6] $ (75)  
Interest [4],[5],[6] 7.00%  
Interest [4],[5],[6] 11.90%  
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 [1],[14],[17] $ 41  
Fair value at ending balance $ 43 [4],[13],[30] $ 41 [1],[14],[17]
Interest 6.50% [4],[13],[30] 6.50% [1],[14],[17]
Interest 11.30% [4],[13],[30] 11.20% [1],[14],[17]
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 [2],[20] $ 1,012  
Fair value at ending balance $ 994 [5],[15] $ 1,012 [2],[20]
Investment owned, balance (in shares) 1,663.31 [5],[8],[9],[15] 1,663.31 [2],[11],[12],[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 [1],[2],[17] $ 4,882  
Fair value at ending balance $ 4,880 [4],[5],[19] $ 4,882 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.90% [4],[5],[19] 10.50% [1],[2],[17]
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 [1],[2],[17] $ 1,556  
Fair value at ending balance $ 1,560 [4],[5],[19] $ 1,556 [1],[2],[17]
Interest 5.75% [4],[5],[19] 5.75% [1],[2],[17]
Interest 10.90% [4],[5],[19] 10.50% [1],[2],[17]
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 [1],[2],[3] $ 8,821  
Fair value at ending balance $ 8,813 [4],[5],[30] $ 8,821 [1],[2],[3]
Interest 4.75% [4],[5],[30] 4.75% [1],[2],[3]
Interest 9.60% [4],[5],[30] 9.10% [1],[2],[3]
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 [1],[2],[3] $ 2,428  
Fair value at ending balance $ 2,428 [4],[5],[30] $ 2,428 [1],[2],[3]
Interest 5.25% [4],[5],[30] 5.25% [1],[2],[3]
Interest 10.10% [4],[5],[30] 9.60% [1],[2],[3]
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 [2],[10],[20] $ 549  
Fair value at ending balance $ 565 [5],[7],[15] $ 549 [2],[10],[20]
Investment owned, balance (in shares) 45,665,825 [5],[7],[8],[9],[15] 45,665,825 [2],[10],[11],[12],[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 [1],[2],[10],[34] $ 5,446  
Fair value at ending balance $ 5,619 [4],[5],[7],[35] $ 5,446 [1],[2],[10],[34]
Interest 5.25% [4],[5],[7],[35] 5.25% [1],[2],[10],[34]
Interest 9.20% [4],[5],[7],[35] 8.20% [1],[2],[10],[34]
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 [2],[10] $ 2,502  
Fair value at ending balance $ 2,891 [5],[7] $ 2,502 [2],[10]
Investment, interest rate, paid in kind 11.00% [5],[7] 11.00% [2],[10]
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 [1],[2],[17] $ 2,628  
Fair value at ending balance $ 3,980 [4],[5],[19] $ 2,628 [1],[2],[17]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.90% [4],[5],[19] 9.50% [1],[2],[17]
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 [2],[20] $ 189  
Fair value at ending balance $ 198 [5],[15] $ 189 [2],[20]
Investment owned, balance (in shares) 152.69 [5],[8],[9],[15] 152.69 [2],[11],[12],[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 [1],[2],[17] $ (12)  
Fair value at ending balance $ (11) [4],[5],[19] $ (12) [1],[2],[17]
Interest 4.75% [4],[5],[19] 4.75% [1],[2],[17]
Interest 9.90% [4],[5],[19] 9.50% [1],[2],[17]
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 [1],[2],[10],[43] $ 5,162  
Fair value at ending balance $ 5,614 [4],[5],[7],[44] $ 5,162 [1],[2],[10],[43]
Interest 6.25% [4],[5],[7],[44] 6.25% [1],[2],[10],[43]
Interest 10.40% [4],[5],[7],[44] 9.20% [1],[2],[10],[43]
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 [1],[2],[3] $ 3,262  
Fair value at ending balance $ 3,151 [4],[5],[30] $ 3,262 [1],[2],[3]
Interest 5.00% [4],[5],[30] 5.00% [1],[2],[3]
Interest 9.80% [4],[5],[30] 9.40% [1],[2],[3]
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3] $ (9)  
Fair value at ending balance $ 0 [4],[5],[30] $ (9) [1],[2],[3]
Interest 5.00% [4],[5],[30] 5.00% [1],[2],[3]
Interest 9.80% [4],[5],[30] 9.40% [1],[2],[3]
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 1,104 $ 1,263
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 152,025 144,884
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 12,707 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 40,930 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 3,508 2,746
Rocade Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance 45,000  
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 62,871 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 39,814 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 22,024 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 19,021 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 14,455 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 20,160 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 1,719 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 45,310 127,617
Gross Reductions (10,011) (124,878)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 101
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 10,841 (916)
Fair value at ending balance 336,133 289,993
Amount of Interest or Dividends Credited to Income 7,798 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 0
Gross Additions 0 1,917
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (159) (654)
Fair value at ending balance 1,104 1,263
Amount of Interest or Dividends Credited to Income 130 (12)
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
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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 99,224
Gross Additions 1 8,677
Gross Reductions (905) (1,818)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 8,045 38,801
Fair value at ending balance 152,025 144,884
Amount of Interest or Dividends Credited to Income 3,210 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 0
Gross Additions 159 12,886
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 101
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 37 (476)
Fair value at ending balance 12,707 12,511
Amount of Interest or Dividends Credited to Income 311 762
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 5,000
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 842 (2,513)
Fair value at ending balance 40,930 40,088
Amount of Interest or Dividends Credited to Income 1,427 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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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 0
Gross Additions 150 4,374
Gross Reductions 0 (1,220)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 612 (408)
Fair value at ending balance 3,508 2,746
Amount of Interest or Dividends Credited to Income 62 307
Affiliate investments | Rocade Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 0  
Gross Additions 45,000  
Gross Reductions 0  
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0  
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 0  
Fair value at ending balance 45,000 0
Amount of Interest or Dividends Credited to Income 734  
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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   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 85,963
Gross Reductions 0 (35,742)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 1,864 (12,271)
Fair value at ending balance 39,814 37,950
Amount of Interest or Dividends Credited to Income 1,204 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 0
Gross Reductions (9,106) (32,793)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 791 (21,306)
Fair value at ending balance 22,024 30,339
Amount of Interest or Dividends Credited to Income 0 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 0 8,800
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (1,191) (2,089)
Fair value at ending balance 19,021 20,212
Amount of Interest or Dividends Credited to Income 720 1,850
Control investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 106,328 22,412
Gross Additions 146 99,701
Gross Reductions 0 (24,561)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 (722)
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (7,269) 9,498
Fair value at ending balance 99,205 106,328
Amount of Interest or Dividends Credited to Income 597 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)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax   1,079
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax   (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 0
Gross Additions 146 78,229
Gross Reductions 0 (18,729)
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 (1,801)
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (10,147) 15,173
Fair value at ending balance 62,871 72,872
Amount of Interest or Dividends Credited to Income 249 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 0
Gross Additions 0 15,275
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (339) (481)
Fair value at ending balance 14,455 14,794
Amount of Interest or Dividends Credited to Income 191 544
Control investments | MVC Automotive Group GmbH    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 16,824 14,848
Gross Additions 0 0
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax 3,336 1,976
Fair value at ending balance 20,160 16,824
Amount of Interest or Dividends Credited to Income 107 435
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 7,564
Gross Additions 0 0
Gross Reductions 0 0
Derivative and Foreign Currency Transaction Price Change, Realized Gain (Loss), Operating, before Tax 0 0
Derivative and Foreign Currency Transaction Price Change, Unrealized Gain (Loss), Operating, before Tax (119) (5,726)
Fair value at ending balance 1,719 1,838
Amount of Interest or Dividends Credited to Income $ 50 $ (831)
[1] Debt investment includes interest rate floor feature.
[2] The fair value of the investment was determined using significant unobservable inputs.
[3] The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.
[4] Debt investment includes interest rate floor feature.
[5] The fair value of the investment was determined using significant unobservable inputs.
[6] The interest rate on these loans is subject to 3 Month SOFR, which as of March 31, 2023 was 4.90855%.
[7] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 26.4% of total investments at fair value as of March 31, 2023. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets. If at any time qualifying assets do not represent at least 70% of the Company’s total assets, the Company will be precluded from acquiring any additional non-qualifying asset until such time as it complies with the requirements of Section 55(a).
[8] All debt investments are income producing, unless otherwise noted. The Company’s external investment adviser, Barings, determines in good faith the fair value of the Company’s investments in accordance with a valuation policy and processes established by the Adviser, which have been approved by the Company’s board of directors (the “Board”), and the Investment Company Act of 1940, as amended (the “1940 Act”). In addition, all debt investments are variable rate investments unless otherwise noted. Index-based floating interest rates are generally subject to a contractual minimum interest rate. Variable rate loans to the Company’s portfolio companies bear interest at a rate that may be determined by reference to the London Interbank Offered Rate (“LIBOR”), the Secured Overnight Financing Rate (“SOFR”), the Euro Interbank Offered Rate (“EURIBOR”), the Bank Bill Swap Bid Rate (“BBSY”), the Stockholm Interbank Offered Rate (“STIBOR”), the Canadian Dollar Offered Rate (“CDOR”), the Sterling Overnight Index Average (“SONIA”), the Swiss Average Rate Overnight (“SARON”), the Norwegian Interbank Offered Rate (“NIBOR”), the Bank Bill Market rate (“BKBM”) or an alternate base rate (commonly based on the Federal Funds Rate or the Prime Rate), at the borrower’s option, which reset annually, semi-annually, quarterly or monthly. For each such loan, the Company has provided the interest rate in effect on the date presented. SOFR based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread. The borrower may also elect to have multiple interest reset periods for each loan.
[9] All of the Company’s portfolio company investments (including joint venture investments), which as of March 31, 2023 represented 212.1% of the Company’s net assets, are subject to legal restrictions on sales. The acquisition date represents the date of the Company's initial investment in the relevant portfolio company.
[10] 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).
[11] 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.
[12] 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.
[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 was purchased as part of the Sierra Merger and is part of the Sierra Reference Portfolio for purposes of the Sierra Credit Support Agreement.
[15] Investment is non-income producing.
[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] Non-accrual investment.
[19] The interest rate on these loans is subject to 3 Month LIBOR, which as of March 31, 2023 was 5.19271%.
[20] Investment is non-income producing.
[21] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2022 was 4.58745%.
[22] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2022 was 2.13200%.
[23] The interest rate on these loans is subject to 3 Month EURIBOR, which as of March 31, 2023 was 3.03800%.
[24] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2022 was 3.01500%.
[25] The interest rate on these loans is subject to 1 Month BBSY, which as of March 31, 2023 was 3.63340%.
[26] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2022 was 4.35806%.
[27] The interest rate on these loans is subject to 1 Month SOFR, which as of March 31, 2023 was 4.80247%.
[28] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2022 was 4.78131%.
[29] The interest rate on these loans is subject to 6 Month SOFR, which as of March 31, 2023 was 4.89968%.
[30] The interest rate on these loans is subject to 1 Month LIBOR, which as of March 31, 2023 was 4.85771%.
[31] The interest rate on these loans is subject to 6 Month LIBOR, which as of March 31, 2023 was 5.31300%.
[32] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2022 was 2.69300%.
[33] The interest rate on these loans is subject to 6 Month EURIBOR, which as of March 31, 2023 was 3.34100%.
[34] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2022 was 3.75470%.
[35] The interest rate on these loans is subject to 3 Month SONIA, which as of March 31, 2023 was 4.29870%.
[36] The interest rate on these loans is subject to 1 Month EURIBOR, which as of March 31, 2023 was 2.91500%.
[37] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2022 was 4.09490%.
[38] The interest rate on these loans is subject to 6 Month SONIA, which as of March 31, 2023 was 4.46810%.
[39] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2022 was 3.76500%.
[40] The interest rate on these loans is subject to 6 Month BBSY, which as of March 31, 2023 was 3.78750%.
[41] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2022 was 2.70100%.
[42] The interest rate on these loans is subject to 3 Month STIBOR, which as of March 31, 2023 was 3.36400%.
[43] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2022 was 3.43570%.
[44] The interest rate on these loans is subject to 1 Month SONIA, which as of March 31, 2023 was 4.16870%.
[45] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2022 was 4.93500%.
[46] The interest rate on these loans is subject to 3 Month CDOR, which as of March 31, 2023 was 5.02750%.
[47] Investment was purchased as part of the MVC Acquisition and is part of the MVC Reference Portfolio for purposes of the MVC Credit Support Agreement.
[48] 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.
[49] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2022 was 3.26470%.
[50] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2022 was 1.88400%.
[51] The interest rate on these loans is subject to 3 Month BBSY, which as of March 31, 2023 was 3.71500%.
[52] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2022 was 4.53000%.
[53] The interest rate on these loans is subject to 3 Month BKBM, which as of March 31, 2023 was 5.15000%.
[54] The interest rate on these loans is subject to 6 Month LIBOR, which as of December 31, 2022 was 5.13886%.
[55] The interest rate on these loans is subject to 12 Month EURIBOR, which as of March 31, 2023 was 3.62200%.
[56] The interest rate on these loans is subject to Prime, which as of December 31, 2022 was 7.50000%.
[57] The interest rate on these loans is subject to Prime, which as of March 31, 2023 was 8.00000%.
[58] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2022 was 3.04000%.
[59] The interest rate on these loans is subject to 1 Month NIBOR, which as of March 31, 2023 was 3.38000%.
[60] The interest rate on these loans is subject to 3 Month SARON, which as of December 31, 2022 was 0.94212%.
[61] The interest rate on these loans is subject to 6 Month SARON, which as of March 31, 2023 was 1.41862%.
[62] The interest rate on these loans is subject to 1 Month CDOR, which as of December 31, 2022 was 4.73750%.
[63] The interest rate on these loans is subject to 1 Month CDOR, which as of March 31, 2023 was 4.95000%.