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Unaudited Consolidated Schedule of Investments - Schedule Of Investments (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] $ 2,448,935  
Fair value at ending balance $ 2,521,635 $ 2,448,935 [1]
Interest 12.50% [2],[3],[4] 4.50% [1],[5],[6],[7]
Interest 18.10% [2],[3],[4] 8.80% [1],[5],[6],[7]
Investment, interest rate, paid in kind [4] 3.30%  
Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 9.10% [8],[9],[10],[11] 9.10% [1],[12],[13],[14]
Sierra Senior Loan Strategy JV I, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 89.01% [8],[9],[10],[11],[15] 89.01% [1],[12],[13],[14],[16]
Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 16.00% [9],[10],[11],[17] 16.00% [1],[13],[14]
Waccamaw River, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 20.00% [8],[9],[10] 20.00% [1],[12],[13],[14]
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],[5],[6],[16],[18],[19] $ 0  
Fair value at ending balance $ 0 [2],[3],[4],[11],[15],[20] $ 0 [1],[5],[6],[16],[18],[19]
Interest 5.00% [2],[3],[4],[11],[15],[20] 5.00% [1],[5],[6],[16],[18],[19]
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],[5],[6],[16],[18],[19] $ 1,263  
Fair value at ending balance $ 1,127 [2],[3],[4],[11],[15],[20] $ 1,263 [1],[5],[6],[16],[18],[19]
Interest 5.00% [2],[3],[4],[11],[15],[20] 5.00% [1],[5],[6],[16],[18],[19]
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 [1],[6],[16],[21] $ 0  
Fair value at ending balance $ 0 [3],[11],[15],[17] $ 0 [1],[6],[16],[21]
Investment owned, balance (in shares) 7,546.76 [3],[9],[10],[11],[15],[17] 7,546.76 [1],[6],[13],[14],[16],[21]
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 20 419
Gross Reductions (22) 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 2 (419)
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income $ 50 $ 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 (15) 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 (121) (235)
Fair value at ending balance 1,127 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],[5],[6],[22] $ 16,307  
Fair value at ending balance $ 15,859 [2],[3],[4] $ 16,307 [1],[5],[6],[22]
Interest 4.75% [2],[3],[4] 4.75% [1],[5],[6],[22]
Interest 10.40% [2],[3],[4] 8.80% [1],[5],[6],[22]
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 [1],[6],[12] $ 12,500  
Fair value at ending balance $ 11,850 [3],[8] $ 12,500 [1],[6],[12]
Interest 14.30% [3],[8] 14.30% [1],[6],[12]
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 [1],[5],[6],[12],[19] $ 4,180  
Fair value at ending balance $ 5,199 [2],[3],[4],[8] $ 4,180 [1],[5],[6],[12],[19]
Interest 9.25% [2],[3],[4],[8] 9.25% [1],[5],[6],[12],[19]
Interest 14.50% [2],[3],[4],[8] 14.00% [1],[5],[6],[12],[19]
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Transportation Services, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 798  
Fair value at ending balance $ 538 [3],[17] $ 798 [1],[6],[21]
Investment owned, balance (in shares) 348.68 [3],[9],[10],[17] 348.68 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 6,215  
Fair value at ending balance $ 6,305 [2],[3],[23] $ 6,215 [1],[5],[6],[19]
Interest 7.50% [2],[3],[23] 7.50% [1],[5],[6],[19]
Interest 12.90% [2],[3],[23] 12.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: AMMC CLO 22, Limited Series 2018-22A, Multi-Sector Holdings, Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[12],[16] $ 3,190  
Fair value at ending balance [1],[12],[16]   $ 3,190
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[12],[16] 1,423  
Fair value at ending balance [1],[12],[16]   1,423
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[15] 2,653  
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[15] 1,337  
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],[5],[6],[12],[24] 2,044  
Fair value at ending balance $ 2,395 [2],[3],[8],[25] $ 2,044 [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25] 6.00% [1],[5],[6],[12],[24]
Interest 9.40% [2],[3],[8],[25] 8.20% [1],[5],[6],[12],[24]
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],[5],[6],[12],[26] $ 2,073  
Fair value at ending balance $ 1,975 [2],[3],[8],[27] $ 2,073 [1],[5],[6],[12],[26]
Interest 7.25% [2],[3],[8],[27] 7.25% [1],[5],[6],[12],[26]
Interest 11.40% [2],[3],[8],[27] 10.30% [1],[5],[6],[12],[26]
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],[5],[6],[19] $ 19,140  
Fair value at ending balance $ 19,660 [2],[3],[4] $ 19,140 [1],[5],[6],[19]
Interest 7.50% [2],[3],[4] 7.50% [1],[5],[6],[19]
Interest 13.00% [2],[3],[4] 12.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 620  
Fair value at ending balance $ 697 [3] $ 620 [1],[6],[21]
Investment owned, balance (in shares) 25,718.2 [3],[9],[10] 25,718.2 [1],[6],[13],[14],[21]
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],[5],[6],[28] $ 20,920  
Fair value at ending balance $ 9,241 [2],[3],[23] $ 20,920 [1],[5],[6],[28]
Interest 4.75% [2],[3],[23] 5.00% [1],[5],[6],[28]
Interest 10.20% [2],[3],[23] 9.30% [1],[5],[6],[28]
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23],[29] $ (10)  
Interest [2],[3],[23],[29] 4.75%  
Interest [2],[3],[23],[29] 10.20%  
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],[5],[6],[19] $ 8,367  
Fair value at ending balance [1],[5],[6],[19]   $ 8,367
Interest [1],[5],[6],[19]   4.25%
Interest [1],[5],[6],[19]   9.00%
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[30] 8,125  
Fair value at ending balance $ 8,271 [2],[3],[4] $ 8,125 [1],[5],[6],[30]
Interest 5.50% [2],[3],[4] 6.00% [1],[5],[6],[30]
Interest 10.90% [2],[3],[4] 10.40% [1],[5],[6],[30]
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],[5],[6],[30] $ (42)  
Fair value at ending balance $ 0 [2],[3],[4],[29] $ (42) [1],[5],[6],[30]
Interest 5.50% [2],[3],[4],[29] 6.00% [1],[5],[6],[30]
Interest 10.90% [2],[3],[4],[29] 10.40% [1],[5],[6],[30]
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],[5],[7] $ 4,416  
Fair value at ending balance $ 4,601 [2],[23] $ 4,416 [1],[5],[7]
Interest 3.25% [2],[23] 3.25% [1],[5],[7]
Interest 8.60% [2],[23] 7.70% [1],[5],[7]
Investment, interest rate, paid in kind 0.30% [2],[23] 0.30% [1],[5],[7]
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],[5],[7] $ 685  
Fair value at ending balance $ 722 [2],[23] $ 685 [1],[5],[7]
Interest 5.50% [2],[23] 4.50% [1],[5],[7]
Interest 10.80% [2],[23] 8.70% [1],[5],[7]
Investment, interest rate, paid in kind 1.00% [2],[23] 1.00% [1],[5],[7]
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 [1] $ 5,919  
Fair value at ending balance $ 6,243 $ 5,919 [1]
Interest 5.00% 5.00% [1]
Investment, interest rate, paid in kind 10.00% 10.00% [1]
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 [1],[6],[21] $ 5,403  
Fair value at ending balance $ 5,743 [3],[17] $ 5,403 [1],[6],[21]
Investment owned, balance (in shares) 5,000 [3],[9],[10],[17] 5,000 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 1,667  
Fair value at ending balance $ 1,875 [3],[17] $ 1,667 [1],[6],[21]
Investment owned, balance (in shares) 1,651 [3],[9],[10],[17] 1,667 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 7,480  
Fair value at ending balance [1],[5],[6],[19]   $ 7,480
Interest [1],[5],[6],[19]   4.50%
Interest [1],[5],[6],[19]   8.90%
Investment, Identifier [Axis]: Acclime Holdings HK Limited, Business services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[31] 2,436  
Fair value at ending balance $ 2,428 [2],[3],[8],[32] $ 2,436 [1],[5],[6],[12],[31]
Interest 6.75% [2],[3],[8],[32] 6.50% [1],[5],[6],[12],[31]
Interest 12.60% [2],[3],[8],[32] 9.60% [1],[5],[6],[12],[31]
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 [1],[6],[21] $ 436  
Fair value at ending balance $ 384 [3],[17] $ 436 [1],[6],[21]
Investment owned, balance (in shares) 437,623.3 [3],[9],[10],[17] 437,623.3 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 12,069  
Fair value at ending balance $ 11,469 [2],[3],[4] $ 12,069 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.30% [2],[3],[4] 10.80% [1],[5],[6],[19]
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 1,116  
Fair value at ending balance $ 1,655 [2],[3],[4],[29] $ 1,116 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4],[29] 5.75% [1],[5],[6],[19]
Interest 11.30% [2],[3],[4],[29] 10.80% [1],[5],[6],[19]
Investment, Identifier [Axis]: Acogroup, Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[33] $ 7,276  
Fair value at ending balance $ 7,191 [2],[3],[8] $ 7,276 [1],[5],[6],[12],[33]
Interest 4.65% [2],[3],[8] 6.25% [1],[5],[6],[12],[33]
Interest 8.60% [2],[3],[8] 6.80% [1],[5],[6],[12],[33]
Investment, interest rate, paid in kind [2],[3],[8] 2.30%  
Investment, Identifier [Axis]: Adhefin International, Industrial Other, First Lien Senior Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[25],[29] $ 1,699  
Interest [2],[3],[8],[25],[29] 6.50%  
Interest [2],[3],[8],[25],[29] 10.50%  
Investment, Identifier [Axis]: Adhefin International, Industrial Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[25] $ 287  
Interest [2],[3],[8],[25] 10.50%  
Investment, interest rate, paid in kind [2],[3],[8],[25] 14.50%  
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 [1],[6],[21] $ 671  
Fair value at ending balance $ 739 [3],[17] $ 671 [1],[6],[21]
Investment owned, balance (in shares) 8,717.76 [3],[9],[10],[17] 8,717.76 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 173  
Fair value at ending balance $ 191 [3],[17] $ 173 [1],[6],[21]
Investment owned, balance (in shares) 2,248.46 [3],[9],[10],[17] 2,248.46 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 0  
Fair value at ending balance $ 0 [3],[17] $ 0 [1],[6],[21]
Investment owned, balance (in shares) 8,717.76 [3],[9],[10],[17] 8,717.76 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 0  
Fair value at ending balance $ 0 [3],[17] $ 0 [1],[6],[21]
Investment owned, balance (in shares) 2,248.46 [3],[9],[10],[17] 2,248.46 [1],[6],[13],[14],[21]
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 [1] $ 4,816  
Fair value at ending balance $ 4,199 $ 4,816 [1]
Interest 9.00% 9.00% [1]
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],[5],[6],[19] $ 12,722  
Fair value at ending balance $ 12,445 [2],[3],[4],[29] $ 12,722 [1],[5],[6],[19]
Interest 5.00% [2],[3],[4],[29] 5.50% [1],[5],[6],[19]
Interest 10.40% [2],[3],[4],[29] 10.20% [1],[5],[6],[19]
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 [2],[3],[8],[25],[29] $ 3,149  
Interest [2],[3],[8],[25],[29] 6.25%  
Interest [2],[3],[8],[25],[29] 10.20%  
Investment, Identifier [Axis]: Alpine SG, LLC, High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[16],[28] $ 22,677  
Fair value at ending balance $ 22,792 [2],[3],[4],[15] $ 22,677 [1],[5],[6],[16],[28]
Interest 6.00% [2],[3],[4],[15] 6.00% [1],[5],[6],[16],[28]
Interest 11.50% [2],[3],[4],[15] 10.40% [1],[5],[6],[16],[28]
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],[5],[7] $ 16,704  
Fair value at ending balance $ 17,158 [2],[3],[23] $ 16,704 [1],[5],[7]
Interest 9.00% [2],[3],[23] 9.00% [1],[5],[7]
Interest 14.40% [2],[3],[23] 13.30% [1],[5],[7]
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 [1],[6],[12],[21] $ 1,121  
Fair value at ending balance $ 1,137 [3],[8],[17] $ 1,121 [1],[6],[12],[21]
Investment owned, balance (in shares) 93,165,208 [3],[8],[9],[10],[17] 93,165,208 [1],[6],[12],[13],[14],[21]
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 [1],[6],[12],[19] $ 4,303  
Fair value at ending balance $ 4,467 [3],[8] $ 4,303 [1],[6],[12],[19]
Interest 2.00% [3],[8] 2.00% [1],[6],[12],[19]
Interest [1],[6],[12],[19]   6.80%
Investment, interest rate, paid in kind 9.00% [3],[8] 9.00% [1],[6],[12],[19]
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrant    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[12],[21] $ 426  
Fair value at ending balance $ 506 [3],[8],[17] $ 426 [1],[6],[12],[21]
Investment owned, balance (in shares) 380,385 [3],[8],[9],[10],[17] 380,385 [1],[6],[12],[13],[14],[21]
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 85  
Investment owned, balance (in shares) [3],[9],[10],[17] 88,110  
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23] $ 1,898  
Interest [2],[3],[23] 5.50%  
Interest [2],[3],[23] 10.80%  
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23],[29] $ (10)  
Interest [2],[3],[23],[29] 5.50%  
Interest [2],[3],[23],[29] 10.80%  
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],[5],[6],[7] $ 2,222  
Fair value at ending balance $ 2,980 [2],[3],[4],[29] $ 2,222 [1],[5],[6],[7]
Interest 6.00% [2],[3],[4],[29] 5.50% [1],[5],[6],[7]
Interest 11.40% [2],[3],[4],[29] 9.60% [1],[5],[6],[7]
Investment, Identifier [Axis]: Amtech LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] $ 128  
Fair value at ending balance $ 198 [2],[3],[4],[29] $ 128 [1],[5],[6],[7]
Interest 6.00% [2],[3],[4],[29] 5.50% [1],[5],[6],[7]
Interest 11.40% [2],[3],[4],[29] 9.60% [1],[5],[6],[7]
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 [1] $ 14,368  
Fair value at ending balance $ 14,801 $ 14,368 [1]
Interest 5.00% 10.00% [1]
Investment, interest rate, paid in kind 10.00% 5.00% [1]
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],[5],[6],[12],[24] $ 2,330  
Fair value at ending balance $ 3,029 [2],[3],[8],[25] $ 2,330 [1],[5],[6],[12],[24]
Interest 6.00% [2],[3],[8],[25] 6.00% [1],[5],[6],[12],[24]
Interest 9.60% [2],[3],[8],[25] 7.70% [1],[5],[6],[12],[24]
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],[5],[6],[12],[24] $ 723  
Fair value at ending balance $ 5,579 [2],[3],[8],[25] $ 723 [1],[5],[6],[12],[24]
Interest 6.00% [2],[3],[8],[25] 6.00% [1],[5],[6],[12],[24]
Interest 9.60% [2],[3],[8],[25] 7.70% [1],[5],[6],[12],[24]
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],[5],[6],[12],[24] $ 5,623  
Fair value at ending balance $ 1,624 [2],[3],[8],[25] $ 5,623 [1],[5],[6],[12],[24]
Interest 7.00% [2],[3],[8],[25] 6.00% [1],[5],[6],[12],[24]
Interest 10.60% [2],[3],[8],[25] 7.70% [1],[5],[6],[12],[24]
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],[5],[6],[12],[19] $ 997  
Fair value at ending balance $ 997 [2],[3],[4],[8] $ 997 [1],[5],[6],[12],[19]
Interest 6.00% [2],[3],[4],[8] 6.00% [1],[5],[6],[12],[19]
Interest 11.70% [2],[3],[4],[8] 10.80% [1],[5],[6],[12],[19]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[24] $ (8)  
Fair value at ending balance $ (8) [2],[3],[8],[25],[29] $ (8) [1],[5],[6],[12],[24]
Interest 6.00% [2],[3],[8],[25],[29] 6.00% [1],[5],[6],[12],[24]
Interest 9.60% [2],[3],[8],[25],[29] 7.70% [1],[5],[6],[12],[24]
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],[5],[6],[7] $ 11,006  
Fair value at ending balance $ 9,883 [2],[3],[20],[23] $ 11,006 [1],[5],[6],[7]
Interest 7.25% [2],[3],[20],[23] 7.25% [1],[5],[6],[7]
Interest [1],[5],[6],[7]   11.60%
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[34] $ 1,753  
Fair value at ending balance $ 1,779 [2],[3],[8],[35] $ 1,753 [1],[5],[6],[12],[34]
Interest 5.75% [2],[3],[8],[35] 6.25% [1],[5],[6],[12],[34]
Interest 10.90% [2],[3],[8],[35] 9.70% [1],[5],[6],[12],[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 [1],[6],[12] $ 266  
Fair value at ending balance $ 271 [3],[8] $ 266 [1],[6],[12]
Investment, interest rate, paid in kind 8.00% 8.00% [1],[6],[12]
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 [1],[12],[16] $ 6,635  
Fair value at ending balance 7,353 [8],[15] $ 6,635 [1],[12],[16]
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 [1],[6],[12],[21] 6  
Fair value at ending balance $ 0 [3],[8],[17] $ 6 [1],[6],[12],[21]
Investment owned, balance (in shares) 48 [3],[8],[9],[10],[17] 48 [1],[6],[12],[13],[14],[21]
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],[5],[6],[12],[36] $ 5,085  
Fair value at ending balance $ 2,022 [2],[3],[8],[37] $ 5,085 [1],[5],[6],[12],[36]
Interest 6.50% [2],[3],[8],[37] 7.00% [1],[5],[6],[12],[36]
Interest 10.40% [2],[3],[8],[37] 8.90% [1],[5],[6],[12],[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 [1],[6],[12],[21] $ 110  
Fair value at ending balance $ 3 [3],[8],[17] $ 110 [1],[6],[12],[21]
Investment owned, balance (in shares) 13 [3],[8],[9],[10],[17] 13 [1],[6],[12],[13],[14],[21]
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],[5],[6],[12],[38] $ 3,344  
Fair value at ending balance $ 3,439 [2],[3],[8],[35] $ 3,344 [1],[5],[6],[12],[38]
Interest 5.50% [2],[3],[8],[35] 5.50% [1],[5],[6],[12],[38]
Interest 10.70% [2],[3],[8],[35] 7.20% [1],[5],[6],[12],[38]
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],[5],[6],[12],[38] $ 5,263  
Fair value at ending balance $ 5,673 [2],[3],[8],[39] $ 5,263 [1],[5],[6],[12],[38]
Interest 6.00% [2],[3],[8],[39] 6.00% [1],[5],[6],[12],[38]
Interest 11.00% [2],[3],[8],[39] 8.90% [1],[5],[6],[12],[38]
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],[5],[6],[12],[38] $ 198  
Fair value at ending balance [1],[5],[6],[12],[38]   $ 198
Interest [1],[5],[6],[12],[38]   6.00%
Interest [1],[5],[6],[12],[38]   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],[5],[6],[12],[38] 1,475  
Fair value at ending balance $ 1,520 [2],[3],[8],[39] $ 1,475 [1],[5],[6],[12],[38]
Interest 10.50% [2],[3],[8],[39] 10.50% [1],[5],[6],[12],[38]
Investment, interest rate, paid in kind [2],[3],[8],[39] 15.90%  
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],[5],[6],[12],[24] $ 2,969  
Fair value at ending balance $ 3,416 [2],[3],[8],[25],[29] $ 2,969 [1],[5],[6],[12],[24]
Interest 5.75% [2],[3],[8],[25],[29] 5.75% [1],[5],[6],[12],[24]
Interest 9.50% [2],[3],[8],[25],[29] 8.00% [1],[5],[6],[12],[24]
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],[5],[6],[19] $ 9,094  
Fair value at ending balance $ 8,993 [2],[3],[4] $ 9,094 [1],[5],[6],[19]
Interest 4.75% [2],[3],[4] 4.75% [1],[5],[6],[19]
Interest 10.20% [2],[3],[4] 9.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: Archimede, Consumer Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[24] $ 6,164  
Fair value at ending balance $ 6,003 [2],[3],[8],[25] $ 6,164 [1],[5],[6],[12],[24]
Interest 5.75% [2],[3],[8],[25] 5.75% [1],[5],[6],[12],[24]
Interest 9.70% [2],[3],[8],[25] 7.50% [1],[5],[6],[12],[24]
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 [1],[6],[12],[21] $ 0  
Fair value at ending balance $ 0 [3],[8],[17] $ 0 [1],[6],[12],[21]
Investment owned, balance (in shares) 464 [3],[8],[9],[10],[17] 464 [1],[6],[12],[13],[14],[21]
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 [1],[6],[12] $ 50  
Fair value at ending balance $ 45 [3],[8] $ 50 [1],[6],[12]
Investment, interest rate, paid in kind 10.00% [3],[8] 10.00% [1],[6],[12]
Investment owned, balance (in shares) 41,560 [3],[8],[9],[10] 41,560 [1],[6],[12],[13],[14]
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],[5],[6],[12],[22] $ 126  
Fair value at ending balance $ 125 [2],[3],[4],[8] $ 126 [1],[5],[6],[12],[22]
Interest 4.00% [2],[3],[4],[8] 5.75% [1],[5],[6],[12],[22]
Interest 9.30% [2],[3],[4],[8] 10.30% [1],[5],[6],[12],[22]
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],[5],[6],[12],[34] $ 1,536  
Fair value at ending balance $ 293 [2],[3],[8],[25] $ 1,536 [1],[5],[6],[12],[34]
Interest 4.00% [2],[3],[8],[25] 5.75% [1],[5],[6],[12],[34]
Interest 7.60% [2],[3],[8],[25] 9.20% [1],[5],[6],[12],[34]
Investment, interest rate, paid in kind 3.30%  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[24] $ 1,547  
Fair value at ending balance $ 1,336 [2],[3],[8],[25] $ 1,547 [1],[5],[6],[12],[24]
Interest 6.75% [2],[3],[8],[25] 5.75% [1],[5],[6],[12],[24]
Interest 10.70% [2],[3],[8],[25] 8.00% [1],[5],[6],[12],[24]
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 4    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[35] $ 1,559  
Interest [2],[3],[8],[35] 4.00%  
Interest [2],[3],[8],[35] 8.90%  
Investment, interest rate, paid in kind [2],[3],[8],[35] 3.30%  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 5    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[29],[35] $ (28)  
Interest [2],[3],[8],[29],[35] 6.50%  
Interest [2],[3],[8],[29],[35] 11.40%  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[12] $ 50  
Fair value at ending balance $ 45 [3],[8] $ 50 [1],[6],[12]
Investment, interest rate, paid in kind 10.00% [3],[8] 10.00% [1],[6],[12]
Investment owned, balance (in shares) 41,560 [3],[8],[9],[10] 41,560 [1],[6],[12],[13],[14]
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Second Lien Term Loan Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8] $ 667  
Investment, interest rate, paid in kind [3],[8] 10.50%  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[12] $ 487  
Fair value at ending balance [1],[6],[12]   $ 487
Investment, interest rate, paid in kind [1],[6],[12]   10.50%
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 3,896  
Fair value at ending balance $ 3,839 [2],[3],[32] $ 3,896 [1],[5],[6],[19]
Interest 5.50% [2],[3],[32] 5.75% [1],[5],[6],[19]
Interest 10.50% [2],[3],[32] 10.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[30] $ 4,932  
Fair value at ending balance $ 4,758 [2],[3],[32] $ 4,932 [1],[5],[6],[30]
Interest 5.50% [2],[3],[32] 5.50% [1],[5],[6],[30]
Interest 10.50% [2],[3],[32] 9.70% [1],[5],[6],[30]
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],[5],[6],[12],[34] $ 1,886  
Fair value at ending balance $ 2,272 [2],[3],[8],[39] $ 1,886 [1],[5],[6],[12],[34]
Interest 5.50% [2],[3],[8],[39] 5.00% [1],[5],[6],[12],[34]
Interest 10.70% [2],[3],[8],[39] 9.40% [1],[5],[6],[12],[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],[5],[6],[12],[33] $ 1,305  
Fair value at ending balance $ 1,364 [2],[3],[8],[37] $ 1,305 [1],[5],[6],[12],[33]
Interest 7.25% [2],[3],[8],[37] 6.25% [1],[5],[6],[12],[33]
Interest 11.30% [2],[3],[8],[37] 8.10% [1],[5],[6],[12],[33]
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],[5],[6],[12],[34] $ 704  
Fair value at ending balance $ 752 [2],[3],[8],[39] $ 704 [1],[5],[6],[12],[34]
Interest 7.25% [2],[3],[8],[39] 7.25% [1],[5],[6],[12],[34]
Interest 12.40% [2],[3],[8],[39] 10.70% [1],[5],[6],[12],[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],[5],[6],[12],[40] $ 2,298  
Fair value at ending balance $ 2,068 [2],[3],[8],[41] $ 2,298 [1],[5],[6],[12],[40]
Interest 4.50% [2],[3],[8],[41] 4.50% [1],[5],[6],[12],[40]
Interest 9.40% [2],[3],[8],[41] 7.70% [1],[5],[6],[12],[40]
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],[5],[6],[7],[16] $ 27,794  
Fair value at ending balance $ 28,956 [2],[3],[15],[23] $ 27,794 [1],[5],[6],[7],[16]
Interest 2.00% [2],[3],[15],[23] 2.00% [1],[5],[6],[7],[16]
Interest 7.30% [2],[3],[15],[23] 6.40% [1],[5],[6],[7],[16]
Investment, interest rate, paid in kind 6.50% [2],[3],[15],[23] 6.50% [1],[5],[6],[7],[16]
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 [1],[6],[21] $ 183  
Fair value at ending balance $ 227 [3],[17] $ 183 [1],[6],[21]
Investment owned, balance (in shares) 192,307.7 [3],[9],[10],[17] 192,307.7 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 4,489  
Fair value at ending balance $ 4,800 [2],[3],[4] $ 4,489 [1],[5],[6],[19]
Interest 5.25% [2],[3],[4] 5.25% [1],[5],[6],[19]
Interest 10.70% [2],[3],[4] 10.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ (6)  
Fair value at ending balance $ (4) [2],[3],[4],[29] $ (6) [1],[5],[6],[19]
Interest 5.25% [2],[3],[4],[29] 5.25% [1],[5],[6],[19]
Interest 10.70% [2],[3],[4],[29] 10.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] $ 1,403  
Fair value at ending balance $ 1,510 [3] $ 1,403 [1],[6]
Investment, interest rate, paid in kind 12.00% [3] 12.00% [1],[6]
Investment, Identifier [Axis]: BPG Holdings IV Corp, Capital Goods, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 13,434  
Interest [2],[3],[4] 6.00%  
Interest [2],[3],[4] 11.40%  
Investment, Identifier [Axis]: BVI Medical, Inc., Healthcare, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[24] $ 9,495  
Fair value at ending balance $ 9,213 [2],[3],[25] $ 9,495 [1],[5],[6],[24]
Interest 9.50% [2],[3],[25] 9.50% [1],[5],[6],[24]
Interest 13.40% [2],[3],[25] 11.60% [1],[5],[6],[24]
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],[5],[6],[12],[33] $ 5,944  
Fair value at ending balance $ 2,223 [2],[3],[8],[37] $ 5,944 [1],[5],[6],[12],[33]
Interest 5.00% [2],[3],[8],[37] 5.50% [1],[5],[6],[12],[33]
Interest 8.90% [2],[3],[8],[37] 6.70% [1],[5],[6],[12],[33]
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],[5],[6],[12],[42] $ 1,060  
Fair value at ending balance $ 1,016 [2],[3],[8],[43] $ 1,060 [1],[5],[6],[12],[42]
Interest 5.25% [2],[3],[8],[43] 5.25% [1],[5],[6],[12],[42]
Interest 9.40% [2],[3],[8],[43] 7.90% [1],[5],[6],[12],[42]
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],[5],[6],[7] $ 2,493  
Fair value at ending balance $ 2,498 [2],[3],[4] $ 2,493 [1],[5],[6],[7]
Interest 4.50% [2],[3],[4] 4.50% [1],[5],[6],[7]
Interest 9.90% [2],[3],[4] 8.90% [1],[5],[6],[7]
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],[5],[6],[12],[33] $ 7,254  
Fair value at ending balance $ 7,336 [2],[3],[8],[37] $ 7,254 [1],[5],[6],[12],[33]
Interest 6.50% [2],[3],[8],[37] 6.50% [1],[5],[6],[12],[33]
Interest 10.10% [2],[3],[8],[37] 8.60% [1],[5],[6],[12],[33]
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],[5],[6],[12],[22] $ 2,484  
Fair value at ending balance $ 2,401 [2],[3],[4],[8] $ 2,484 [1],[5],[6],[12],[22]
Interest 5.50% [2],[3],[4],[8] 5.50% [1],[5],[6],[12],[22]
Interest 10.80% [2],[3],[4],[8] 9.80% [1],[5],[6],[12],[22]
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],[5],[6],[12],[34] $ 792  
Fair value at ending balance $ 776 [2],[3],[8],[35] $ 792 [1],[5],[6],[12],[34]
Interest 5.75% [2],[3],[8],[35] 5.50% [1],[5],[6],[12],[34]
Interest 11.10% [2],[3],[8],[35] 9.00% [1],[5],[6],[12],[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],[5],[6],[12],[24] $ 2,939  
Fair value at ending balance $ 2,298 [2],[3],[8],[25] $ 2,939 [1],[5],[6],[12],[24]
Interest 6.25% [2],[3],[8],[25] 6.25% [1],[5],[6],[12],[24]
Interest 7.60% [2],[3],[8],[25] 8.20% [1],[5],[6],[12],[24]
Investment, interest rate, paid in kind [2],[3],[8],[25] 2.50%  
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 417 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 6,064 5,647
Amount of Interest or Dividends Credited to Income $ 688 $ 544
Interest 14.30% 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 (3,007) (481)
Fair value at ending balance 6,140 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],[5],[6],[7],[16] $ 5,647  
Fair value at ending balance $ 6,064 [2],[3],[15],[23],[44] $ 5,647 [1],[5],[6],[7],[16]
Interest 9.00% [2],[3],[15],[23],[44] 9.10% [1],[5],[6],[7],[16]
Interest 14.30% [2],[3],[15],[23],[44] 13.50% [1],[5],[6],[7],[16]
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 [1],[6],[16],[18] $ 9,147  
Fair value at ending balance $ 6,140 [3],[15],[20],[44] $ 9,147 [1],[6],[16],[18]
Investment, interest rate, paid in kind 10.00% [3],[15],[20],[44] 10.00% [1],[6],[16],[18]
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 [1],[6],[16],[21] $ 0  
Fair value at ending balance $ 0 [3],[15],[17],[44] $ 0 [1],[6],[16],[21]
Investment owned, balance (in shares) 44.6 [3],[9],[10],[15],[17],[44] 44.6 [1],[6],[13],[14],[16],[21]
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],[5],[6],[19] $ 1,735  
Fair value at ending balance $ 1,671 [2],[3],[4] $ 1,735 [1],[5],[6],[19]
Interest 5.25% [2],[3],[4] 5.25% [1],[5],[6],[19]
Interest 10.60% [2],[3],[4] 10.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Municipal Revenue Bond    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] $ 28,300  
Fair value at ending balance $ 28,425 $ 28,300 [1]
Interest 11.50% 11.50% [1]
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 [1],[6] $ 14,731  
Fair value at ending balance $ 15,414 [3] $ 14,731 [1],[6]
Investment, interest rate, paid in kind 7.00% [3] 7.00% [1],[6]
Investment owned, balance (in shares) 14,618 [3],[9],[10] 14,618 [1],[6],[13],[14]
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],[5],[6],[19] $ 4,724  
Fair value at ending balance $ 4,538 [2],[3],[4] $ 4,724 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.30% [2],[3],[4] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, LLC units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 1,152  
Fair value at ending balance $ 930 [3],[17] $ 1,152 [1],[6],[21]
Investment owned, balance (in shares) 1,107,492.71 [3],[9],[10],[17] 1,107,492.71 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ (12)  
Fair value at ending balance $ 835 [2],[3],[4] $ (12) [1],[5],[6],[19]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.30% [2],[3],[4] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Brightline Trains Florida LLC, Transportation, Senior Secured Note    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] $ 4,350  
Fair value at ending balance $ 4,525 [3] $ 4,350 [1],[6]
Interest 8.00% [3] 8.00% [1],[6]
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],[5],[6],[12],[24] $ 2,156  
Fair value at ending balance $ 2,152 [2],[3],[8],[25] $ 2,156 [1],[5],[6],[12],[24]
Interest 5.00% [2],[3],[8],[25] 5.00% [1],[5],[6],[12],[24]
Interest 8.70% [2],[3],[8],[25] 6.50% [1],[5],[6],[12],[24]
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 [1] $ 692  
Fair value at ending balance $ 633 $ 692 [1]
Interest 8.40% 8.40% [1]
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],[5],[6],[12],[34] $ 13,454  
Fair value at ending balance $ 13,755 [2],[3],[8],[39] $ 13,454 [1],[5],[6],[12],[34]
Interest 7.00% [2],[3],[8],[39] 7.00% [1],[5],[6],[12],[34]
Interest 11.90% [2],[3],[8],[39] 9.30% [1],[5],[6],[12],[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],[5],[16],[22] $ 2,478  
Fair value at ending balance $ 2,512 [2],[4],[15] $ 2,478 [1],[5],[16],[22]
Interest 4.00% [2],[4],[15] 4.00% [1],[5],[16],[22]
Interest 9.60% [2],[4],[15] 8.50% [1],[5],[16],[22]
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],[5],[6],[19] $ 6,281  
Fair value at ending balance $ 6,155 [2],[3],[4] $ 6,281 [1],[5],[6],[19]
Interest 5.25% [2],[3],[4] 5.25% [1],[5],[6],[19]
Interest 11.20% [2],[3],[4] 10.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Auto Parts & Equipment, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 446  
Fair value at ending balance $ 498 [3],[17] $ 446 [1],[6],[21]
Investment owned, balance (in shares) 455 [3],[9],[10],[17] 455 [1],[6],[13],[14],[21]
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],[5],[6],[28] $ 4,390  
Fair value at ending balance $ 4,550 [2],[3],[23] $ 4,390 [1],[5],[6],[28]
Interest 9.00% [2],[3],[23] 9.00% [1],[5],[6],[28]
Interest 14.30% [2],[3],[23] 13.30% [1],[5],[6],[28]
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 [1],[6],[12] $ 5,239  
Fair value at ending balance [1],[6],[12]   $ 5,239
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 1,341  
Fair value at ending balance $ 4,638 [2],[3],[4] $ 1,341 [1],[5],[6],[19]
Interest 6.25% [2],[3],[4] 6.25% [1],[5],[6],[19]
Interest 11.90% [2],[3],[4] 10.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 4,879  
Fair value at ending balance $ 1,275 [2],[3],[4] $ 4,879 [1],[5],[6],[19]
Interest 6.25% [2],[3],[4] 6.25% [1],[5],[6],[19]
Interest 11.90% [2],[3],[4] 11.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: CAi Software, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ (24)  
Fair value at ending balance $ (63) [2],[3],[4],[29] $ (24) [1],[5],[6],[19]
Interest 6.25% [2],[3],[4],[29] 6.25% [1],[5],[6],[19]
Interest 11.90% [2],[3],[4],[29] 11.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] $ 10,377  
Fair value at ending balance $ 20,869 [2],[3],[4] $ 10,377 [1],[5],[6],[7]
Interest 5.75% [2],[3],[4] 4.50% [1],[5],[6],[7]
Interest 11.30% [2],[3],[4] 8.80% [1],[5],[6],[7]
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],[5],[6],[22] $ 1,344  
Fair value at ending balance $ 1,341 [2],[3],[4] $ 1,344 [1],[5],[6],[22]
Interest 5.75% [2],[3],[4] 4.75% [1],[5],[6],[22]
Interest 11.30% [2],[3],[4] 9.30% [1],[5],[6],[22]
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 [1],[6],[21] $ 1,027  
Fair value at ending balance $ 1,164 [3],[17] $ 1,027 [1],[6],[21]
Investment owned, balance (in shares) 657 [3],[9],[10],[17] 551 [1],[6],[13],[14],[21]
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],[5],[6],[7] $ (49)  
Fair value at ending balance $ (41) [2],[3],[4],[29] $ (49) [1],[5],[6],[7]
Interest [4],[29] 5.75%  
Interest [4],[29] 11.30%  
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],[5],[6],[22] $ 18,060  
Fair value at ending balance $ 18,314 [2],[3],[4] $ 18,060 [1],[5],[6],[22]
Interest 4.75% [2],[3],[4] 5.00% [1],[5],[6],[22]
Interest 10.30% [2],[3],[4] 9.00% [1],[5],[6],[22]
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],[5],[6],[19] $ 3,928  
Fair value at ending balance $ 3,727 [2],[3],[23] $ 3,928 [1],[5],[6],[19]
Interest 5.00% [2],[3],[23] 5.00% [1],[5],[6],[19]
Interest 10.30% [2],[3],[23] 9.20% [1],[5],[6],[19]
Investment, interest rate, paid in kind [2],[3],[23] 0.30%  
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23] $ 659  
Interest [2],[3],[23] 5.00%  
Interest [2],[3],[23] 10.30%  
Investment, interest rate, paid in kind [2],[3],[23] 0.30%  
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, Incremental Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 154  
Investment owned, balance (in shares) [3],[9],[10],[17] 3,853  
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 [1],[6] $ 165  
Fair value at ending balance $ 38 [3],[17] $ 165 [1],[6]
Investment owned, balance (in shares) 8,782 [3],[9],[10],[17] 8,782 [1],[6],[13],[14]
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],[5],[6],[12],[45] $ 1,921  
Fair value at ending balance $ 1,964 [2],[3],[8],[46] $ 1,921 [1],[5],[6],[12],[45]
Interest 5.25% [2],[3],[8],[46] 5.25% [1],[5],[6],[12],[45]
Interest 10.50% [2],[3],[8],[46] 8.70% [1],[5],[6],[12],[45]
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],[5],[7],[16] $ 4,505  
Fair value at ending balance $ 4,675 [2],[15],[23] $ 4,505 [1],[5],[7],[16]
Interest 4.25% [2],[15],[23] 4.25% [1],[5],[7],[16]
Interest 9.70% [2],[15],[23] 8.60% [1],[5],[7],[16]
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],[5],[6],[12],[24] $ 891  
Fair value at ending balance $ 900 [2],[3],[8],[25] $ 891 [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25] 5.50% [1],[5],[6],[12],[24]
Interest 9.10% [2],[3],[8],[25] 7.60% [1],[5],[6],[12],[24]
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],[5],[6],[12],[22] $ 1,122  
Fair value at ending balance $ 1,142 [2],[3],[4],[8] $ 1,122 [1],[5],[6],[12],[22]
Interest 5.50% [2],[3],[4],[8] 5.50% [1],[5],[6],[12],[22]
Interest 10.70% [2],[3],[4],[8] 10.20% [1],[5],[6],[12],[22]
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23] $ 2,761  
Interest [2],[3],[23] 6.00%  
Interest [2],[3],[23] 11.40%  
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 204  
Fair value at ending balance $ 301 [3],[17] $ 204 [1],[6],[21]
Investment owned, balance (in shares) 161,290.32 [3],[9],[10],[17] 161,290.32 [1],[6],[13],[14],[21]
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],[5],[6],[7] $ 2,766  
Fair value at ending balance [1],[5],[6],[7]   $ 2,766
Interest [1],[5],[6],[7]   6.00%
Interest [1],[5],[6],[7]   10.40%
Investment, Identifier [Axis]: Cadent, LLC (f/k/a Cross MediaWorks), Media & Entertainment, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 6,580  
Fair value at ending balance [1],[5],[6],[19]   $ 6,580
Interest [1],[5],[6],[19]   6.50%
Interest [1],[5],[6],[19]   11.20%
Investment, Identifier [Axis]: Cadent, LLC (f/k/a Cross MediaWorks), Media & Entertainment, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 11,080  
Fair value at ending balance [1],[5],[6],[19]   $ 11,080
Interest [1],[5],[6],[19]   6.50%
Interest [1],[5],[6],[19]   11.20%
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class A Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[12],[21] $ 292  
Fair value at ending balance [1],[6],[12],[21]   $ 292
Investment owned, balance (in shares) 500,000 [3],[8],[9],[10],[17] 500,000 [1],[6],[12],[13],[14],[21]
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 [1],[6],[12],[21] $ 0  
Fair value at ending balance [1],[6],[12],[21]   $ 0
Investment owned, balance (in shares) 74,712.64 [3],[8],[9],[10],[17] 74,712.64 [1],[6],[12],[13],[14],[21]
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],[5],[6],[12],[47] $ 1,468  
Fair value at ending balance $ 1,423 [2],[3],[8],[48] $ 1,468 [1],[5],[6],[12],[47]
Interest 3.50% [2],[3],[8],[48] 7.00% [1],[5],[6],[12],[47]
Interest 3.50% [2],[3],[8],[48] 11.90% [1],[5],[6],[12],[47]
Investment, interest rate, paid in kind [2],[3],[8],[48] 9.00%  
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],[5],[6],[12],[22] $ 4,269  
Fair value at ending balance $ 4,210 [2],[3],[4],[8] $ 4,269 [1],[5],[6],[12],[22]
Interest 7.64% [2],[3],[4],[8] 7.64% [1],[5],[6],[12],[22]
Interest 13.60% [2],[3],[4],[8] 12.50% [1],[5],[6],[12],[22]
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 [1],[6],[12],[21] $ 627  
Fair value at ending balance $ 644 [3],[8],[17] $ 627 [1],[6],[12],[21]
Investment owned, balance (in shares) 681,818 [3],[8],[9],[10],[17] 681,818 [1],[6],[12],[13],[14],[21]
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units - Class X Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8],[17] $ 35  
Investment owned, balance (in shares) [3],[8],[9],[10],[17] 45,604  
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[21] $ 1,339  
Fair value at ending balance [1],[21]   $ 1,339
Investment owned, balance (in shares) [1],[13],[14],[21]   94,155
Investment, Identifier [Axis]: Carlson Travel, Inc, Business Travel Management, First Lien Senior Secured Note    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 5,113  
Fair value at ending balance [1]   $ 5,113
Interest [1]   8.50%
Investment, Identifier [Axis]: Catawba River Limited, Finance Companies, Structured - Junior Note    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8] 3,390  
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 [1],[5],[6],[12],[24] 820  
Fair value at ending balance $ 3,057 [2],[3],[8],[25] $ 820 [1],[5],[6],[12],[24]
Interest 5.25% [2],[3],[8],[25] 5.25% [1],[5],[6],[12],[24]
Interest 9.10% [2],[3],[8],[25] 7.10% [1],[5],[6],[12],[24]
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],[5],[6],[12],[24] $ 1,158  
Fair value at ending balance [1],[5],[6],[12],[24]   $ 1,158
Interest [1],[5],[6],[12],[24]   5.75%
Interest [1],[5],[6],[12],[24]   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],[5],[6],[12],[33] 3,139  
Fair value at ending balance $ 3,206 [2],[3],[8],[37] $ 3,139 [1],[5],[6],[12],[33]
Interest 6.00% [2],[3],[8],[37] 5.50% [1],[5],[6],[12],[33]
Interest 9.60% [2],[3],[8],[37] 7.10% [1],[5],[6],[12],[33]
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 [1],[6],[12],[21] $ 0  
Fair value at ending balance [1],[6],[12],[21]   $ 0
Investment owned, balance (in shares) 553,375 [3],[8],[9],[10],[17] 553,375 [1],[6],[12],[13],[14],[21]
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],[5],[6],[7] $ 6,189  
Fair value at ending balance $ 5,991 [2],[3],[32] $ 6,189 [1],[5],[6],[7]
Interest 5.75% [2],[3],[32] 5.75% [1],[5],[6],[7]
Interest 11.30% [2],[3],[32] 10.10% [1],[5],[6],[7]
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[32] $ 587  
Interest [2],[3],[32] 5.75%  
Interest [2],[3],[32] 11.30%  
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers,First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] $ 523  
Fair value at ending balance [1],[5],[6],[7]   $ 523
Interest [1],[5],[6],[7]   5.75%
Interest [1],[5],[6],[7]   10.10%
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[11] $ 15,618  
Interest [3],[11] 8.00%  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions 12,732  
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 29  
Fair value at ending balance 12,761 [3],[9],[10],[11],[17] $ 0
Amount of Interest or Dividends Credited to Income $ 0  
Investment owned, balance (in shares) [3],[9],[10],[11],[17] 2,407,825  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 10,729  
Fair value at ending balance [1],[6],[21]   $ 10,729
Investment owned, balance (in shares) [1],[6],[13],[14],[21]   2,037,735
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, Subordinated Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] 6,036  
Fair value at ending balance [1],[6]   $ 6,036
Investment, interest rate, paid in kind [1],[6]   10.00%
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Other Financial, Subordinated Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] 15,528  
Fair value at ending balance [1],[6]   $ 15,528
Interest [1],[6]   8.00%
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[11] $ 6,526  
Investment, interest rate, paid in kind [3],[11] 10.00%  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions 15,610  
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 8  
Fair value at ending balance 15,618 $ 0
Amount of Interest or Dividends Credited to Income $ 350  
Interest 8.00%  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Subordinated Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions 6,521  
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 5  
Fair value at ending balance 6,526 0
Amount of Interest or Dividends Credited to Income $ 179  
Investment, interest rate, paid in kind 10.00%  
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, Diversified Manufacturing    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[19] $ 1,270  
Fair value at ending balance [1],[5],[6],[12],[19]   $ 1,270
Interest [1],[5],[6],[12],[19]   6.25%
Interest [1],[5],[6],[12],[19]   11.00%
Investment, Identifier [Axis]: Cobham Slip Rings SAS, Diversified Manufacturing, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[8] $ 1,292  
Interest [2],[3],[4],[8] 6.25%  
Interest [2],[3],[4],[8] 11.60%  
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, Class B Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 196  
Fair value at ending balance $ 223 [3],[17] $ 196 [1],[6],[21]
Investment owned, balance (in shares) 33,324.69 [3],[9],[10],[17] 33,324.69 [1],[6],[13],[14],[21]
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],[5],[6],[28] $ 13,302  
Fair value at ending balance $ 13,345 [2],[3],[23] $ 13,302 [1],[5],[6],[28]
Interest 6.75% [2],[3],[23] 7.75% [1],[5],[6],[28]
Interest 12.10% [2],[3],[23] 12.10% [1],[5],[6],[28]
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 [1],[6],[21] $ 159  
Fair value at ending balance $ 140 [3],[17] $ 159 [1],[6],[21]
Investment owned, balance (in shares) 46,085.6 [3],[9],[10],[17] 46,085.6 [1],[6],[13],[14],[21]
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 [1],[6] $ 369  
Fair value at ending balance $ 619 [3] $ 369 [1],[6]
Interest 11.00% [3] 11.00% [1],[6]
Investment, interest rate, paid in kind 1.00% [3] 1.00% [1],[6]
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],[5],[6],[30] $ 13,446  
Fair value at ending balance $ 13,126 [2],[3],[4] $ 13,446 [1],[5],[6],[30]
Interest 5.00% [2],[3],[4] 5.75% [1],[5],[6],[30]
Interest 10.30% [2],[3],[4] 10.60% [1],[5],[6],[30]
Investment, Identifier [Axis]: Comply365, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[30] $ 148  
Fair value at ending balance $ (11) [2],[3],[4],[29] $ 148 [1],[5],[6],[30]
Interest 5.00% [2],[3],[4],[29] 5.75% [1],[5],[6],[30]
Interest 10.30% [2],[3],[4],[29] 10.60% [1],[5],[6],[30]
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],[5],[6],[12],[24] $ 4,845  
Fair value at ending balance $ 4,851 [2],[3],[8],[25] $ 4,845 [1],[5],[6],[12],[24]
Interest 5.25% [2],[3],[8],[25] 6.00% [1],[5],[6],[12],[24]
Interest 9.00% [2],[3],[8],[25] 7.60% [1],[5],[6],[12],[24]
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 [1],[21] $ 7  
Fair value at ending balance $ 66 [17] $ 7 [1],[21]
Investment owned, balance (in shares) 91,504 [9],[10],[17] 91,504 [1],[13],[14],[21]
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 [1],[6],[18] $ 11,118  
Fair value at ending balance $ 22,976 [3],[20] $ 11,118 [1],[6],[18]
Interest 9.80% [3],[20] 13.00% [1],[6],[18]
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 [1],[6],[12],[21] $ 196  
Fair value at ending balance $ 201 [3],[8],[17] $ 196 [1],[6],[12],[21]
Investment owned, balance (in shares) 440 [3],[8],[9],[10],[17] 440 [1],[6],[12],[13],[14],[21]
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 [1],[6],[12],[21] $ 497  
Fair value at ending balance $ 538 [3],[8],[17] $ 497 [1],[6],[12],[21]
Investment owned, balance (in shares) 191 [3],[8],[9],[10],[17] 191 [1],[6],[12],[13],[14],[21]
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],[5],[6],[12],[33] $ 4,233  
Fair value at ending balance $ 4,276 [2],[3],[8],[37] $ 4,233 [1],[5],[6],[12],[33]
Interest 3.25% [2],[3],[8],[37] 3.25% [1],[5],[6],[12],[33]
Interest 6.30% [2],[3],[8],[37] 3.30% [1],[5],[6],[12],[33]
Investment, interest rate, paid in kind 3.50% [2],[3],[8],[37] 3.50% [1],[5],[6],[12],[33]
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 [1],[6],[18],[49] $ 189  
Fair value at ending balance [1],[6],[18],[49]   $ 189
Investment, interest rate, paid in kind [1],[6],[18],[49]   15.00%
Investment, Identifier [Axis]: Custom Alloy Corporation, Manufacturer of Pipe Fittings & Forgings, Second Lien Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[18],[49] 1,997  
Fair value at ending balance [1],[6],[18],[49]   $ 1,997
Investment, interest rate, paid in kind [1],[6],[18],[49]   15.00%
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[28] 5,491  
Fair value at ending balance $ 5,743 [2],[3],[23] $ 5,491 [1],[5],[6],[28]
Interest 5.50% [2],[3],[23] 5.50% [1],[5],[6],[28]
Interest 10.80% [2],[3],[23] 9.80% [1],[5],[6],[28]
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],[5],[6],[28] $ 0  
Fair value at ending balance $ 64 [2],[3],[23] $ 0 [1],[5],[6],[28]
Interest 5.50% [2],[3],[23] 5.50% [1],[5],[6],[28]
Interest 10.80% [2],[3],[23] 9.80% [1],[5],[6],[28]
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],[5],[6],[16],[19] $ 14,259  
Fair value at ending balance $ 14,293 [2],[3],[4],[15] $ 14,259 [1],[5],[6],[16],[19]
Interest 5.50% [2],[3],[4],[15] 6.25% [1],[5],[6],[16],[19]
Interest 11.10% [2],[3],[4],[15] 11.00% [1],[5],[6],[16],[19]
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],[5],[6],[16],[19] $ 2,100  
Fair value at ending balance $ 2,121 [2],[3],[4],[15] $ 2,100 [1],[5],[6],[16],[19]
Interest 5.50% [2],[3],[4],[15] 6.25% [1],[5],[6],[16],[19]
Interest 11.10% [2],[3],[4],[15] 11.00% [1],[5],[6],[16],[19]
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],[5],[6],[22] $ 1,875  
Fair value at ending balance $ 1,874 [2],[3],[4] $ 1,875 [1],[5],[6],[22]
Interest 6.00% [2],[3],[4] 6.00% [1],[5],[6],[22]
Interest 11.40% [2],[3],[4] 10.30% [1],[5],[6],[22]
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 [1],[6],[21] $ 96  
Fair value at ending balance $ 96 [3],[17] $ 96 [1],[6],[21]
Investment owned, balance (in shares) 96,153.85 [3],[9],[10],[17] 96,153.85 [1],[6],[13],[14],[21]
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],[5],[6],[22] $ (11)  
Fair value at ending balance $ (8) [2],[3],[4],[29] $ (11) [1],[5],[6],[22]
Interest 6.00% [2],[3],[4],[29] 6.00% [1],[5],[6],[22]
Interest 11.40% [2],[3],[4],[29] 10.30% [1],[5],[6],[22]
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 [1],[6],[21] $ 48  
Fair value at ending balance $ 41 [3],[17] $ 48 [1],[6],[21]
Investment owned, balance (in shares) 1,280.8 [3],[9],[10],[17] 1,280.8 [1],[6],[13],[14],[21]
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],[5],[6],[7] $ 690  
Fair value at ending balance $ 1,122 [2],[3],[23] $ 690 [1],[5],[6],[7]
Interest 6.25% [2],[3],[23] 6.00% [1],[5],[6],[7]
Interest 11.70% [2],[3],[23] 10.40% [1],[5],[6],[7]
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],[5],[6],[7] $ (3)  
Fair value at ending balance $ (10) [2],[3],[23],[29] $ (3) [1],[5],[6],[7]
Interest 6.25% [2],[3],[23],[29] 6.00% [1],[5],[6],[7]
Interest 11.70% [2],[3],[23],[29] 10.40% [1],[5],[6],[7]
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 [1],[5],[6],[19] $ 6,096  
Fair value at ending balance $ 6,599 [2],[3],[4] $ 6,096 [1],[5],[6],[19]
Interest 6.50% [2],[3],[4] 6.50% [1],[5],[6],[19]
Interest 12.00% [2],[3],[4] 10.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[37] $ 2,615  
Interest [2],[3],[8],[37] 6.25%  
Interest [2],[3],[8],[37] 10.20%  
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],[5],[6],[12],[24] $ 2,515  
Fair value at ending balance [1],[5],[6],[12],[24]   $ 2,515
Interest [1],[5],[6],[12],[24]   6.50%
Interest [1],[5],[6],[12],[24]   8.10%
Investment, Identifier [Axis]: Dragon Bidco, Technology, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[33] 1,153  
Fair value at ending balance [1],[5],[6],[12],[33]   $ 1,153
Interest [1],[5],[6],[12],[33]   6.75%
Interest [1],[5],[6],[12],[33]   8.90%
Investment, Identifier [Axis]: DreamStart Bidco SAS (d/b/a SmartTrade), Diversified Financial Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[24] 2,247  
Fair value at ending balance $ 2,252 [2],[3],[8],[25] $ 2,247 [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25] 6.00% [1],[5],[6],[12],[24]
Interest 9.50% [2],[3],[8],[25] 8.20% [1],[5],[6],[12],[24]
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 [1],[12],[16] $ 2,084  
Fair value at ending balance 1,672 [8],[15] $ 2,084 [1],[12],[16]
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 [1],[12],[16] 4,267  
Fair value at ending balance 2,764 [8],[15] 4,267 [1],[12],[16]
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],[5],[6],[12],[24] 111  
Fair value at ending balance $ 98 [2],[3],[8],[25] $ 111 [1],[5],[6],[12],[24]
Interest 6.00% [2],[3],[8],[25] 5.75% [1],[5],[6],[12],[24]
Interest 10.00% [2],[3],[8],[25] 8.00% [1],[5],[6],[12],[24]
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],[5],[6],[12],[19] $ 1,209  
Fair value at ending balance $ 1,370 [2],[3],[4],[8] $ 1,209 [1],[5],[6],[12],[19]
Interest 6.00% [2],[3],[4],[8] 5.75% [1],[5],[6],[12],[19]
Interest 11.30% [2],[3],[4],[8] 10.50% [1],[5],[6],[12],[19]
Investment, Identifier [Axis]: Dunlipharder B.V., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[22] $ 988  
Fair value at ending balance $ 992 [2],[3],[4],[8] $ 988 [1],[5],[6],[12],[22]
Interest 6.10% [2],[3],[4],[8] 6.50% [1],[5],[6],[12],[22]
Interest 11.50% [2],[3],[4],[8] 10.70% [1],[5],[6],[12],[22]
Investment, Identifier [Axis]: Dwyer Instruments, Inc., Electric, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 9,457  
Interest [2],[3],[4] 5.75%  
Interest [2],[3],[4] 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],[5],[6],[19] $ 25,287  
Fair value at ending balance [1],[5],[6],[19]   $ 25,287
Interest [1],[5],[6],[19]   6.00%
Interest [1],[5],[6],[19]   10.70%
Investment, Identifier [Axis]: EFC International, Automotive, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 264  
Investment owned, balance (in shares) [3],[9],[10],[17] 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 [3] $ 757  
Interest [3] 11.00%  
Investment, interest rate, paid in kind [3] 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],[5],[6],[19] $ 12,008  
Fair value at ending balance $ 10,623 [2],[3],[32] $ 12,008 [1],[5],[6],[19]
Interest 5.75% [2],[3],[32] 5.75% [1],[5],[6],[19]
Interest 11.50% [2],[3],[32] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 1,409  
Fair value at ending balance $ 1,996 [2],[3],[32] $ 1,409 [1],[5],[6],[19]
Interest 5.75% [2],[3],[32] 5.75% [1],[5],[6],[19]
Interest 11.50% [2],[3],[32] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Electrical Components & Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 6,024  
Fair value at ending balance $ 5,858 [2],[3],[4] $ 6,024 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.30% [2],[3],[4] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 933  
Fair value at ending balance $ 576 [3],[17] $ 933 [1],[6],[21]
Investment owned, balance (in shares) 530.92 [3],[9],[10],[17] 530.92 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 9,100  
Fair value at ending balance $ 9,261 [2],[3],[23] $ 9,100 [1],[5],[6],[19]
Interest 8.00% [2],[3],[23] 7.00% [1],[5],[6],[19]
Interest 13.40% [2],[3],[23] 11.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: Eclipse Business Capital Holdings LLC, Revolver, Funded    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 5,300  
Fair value at ending balance 4,700 $ 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 [1],[6] 135,066  
Fair value at ending balance $ 147,054 [3],[11] $ 135,066 [1],[6]
Investment owned, balance (in shares) 89,447,396 [3],[11] 89,447,396 [1],[6],[13],[14]
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 [1],[6],[7] $ 5,273  
Fair value at ending balance $ 4,728 [3],[11],[23] $ 5,273 [1],[6],[7]
Interest 7.25% [3],[11],[23] 7.25% [1],[6],[7]
Interest [3],[11],[23] 12.60%  
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] $ 4,545  
Fair value at ending balance $ 4,545 [3],[11] $ 4,545 [1],[6]
Interest 7.50% [3],[11] 7.50% [1],[6]
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 354 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 11,634 39,018
Fair value at ending balance 147,054 135,066
Amount of Interest or Dividends Credited to Income $ 10,629 $ 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 20,924 5,292
Gross Reductions (21,454) (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 (15) (19)
Fair value at ending balance 4,728 5,273
Amount of Interest or Dividends Credited to Income $ 350 $ 488
Interest 7.25% 7.25%
Interest 12.60%  
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 4,545 $ 4,738
Gross Additions 4 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 (4) (198)
Fair value at ending balance 4,545 4,545
Amount of Interest or Dividends Credited to Income $ 259 $ 343
Interest 7.50% 7.50%
Investment, Identifier [Axis]: Ellkay, LLC, Healthcare and Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 4,893  
Fair value at ending balance $ 4,572 [2],[3],[4] $ 4,893 [1],[5],[6],[19]
Interest 6.25% [2],[3],[4] 6.25% [1],[5],[6],[19]
Interest 11.80% [2],[3],[4] 11.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: Entact Environmental Services, Inc., Environmental Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 5,529  
Fair value at ending balance $ 7,111 [2],[3],[4] $ 5,529 [1],[5],[6],[19]
Interest 5.50% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.00% [2],[3],[4] 11.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[24] $ 1,352  
Fair value at ending balance $ 1,126 [2],[3],[8],[25] $ 1,352 [1],[5],[6],[12],[24]
Interest 4.50% [2],[3],[8],[25] 6.75% [1],[5],[6],[12],[24]
Interest 8.00% [2],[3],[8],[25] 8.90% [1],[5],[6],[12],[24]
Investment, interest rate, paid in kind 2.80%  
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[22] $ 745  
Fair value at ending balance $ 721 [2],[3],[4],[8] $ 745 [1],[5],[6],[12],[22]
Interest 4.50% [2],[3],[4],[8] 6.75% [1],[5],[6],[12],[22]
Interest 9.90% [2],[3],[4],[8] 11.50% [1],[5],[6],[12],[22]
Investment, interest rate, paid in kind [4] 2.80%  
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[34] $ 2,111  
Fair value at ending balance $ 2,069 [2],[3],[8],[35] $ 2,111 [1],[5],[6],[12],[34]
Interest 4.50% [2],[3],[8],[35] 6.75% [1],[5],[6],[12],[34]
Interest 9.50% [2],[3],[8],[35] 10.00% [1],[5],[6],[12],[34]
Investment, interest rate, paid in kind [35] 2.80%  
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12] $ 513  
Fair value at ending balance [1],[5],[6],[12]   $ 513
Investment, interest rate, paid in kind [1],[5],[6],[12]   11.50%
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8] $ 531  
Investment, interest rate, paid in kind [3],[8] 11.50%  
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[50] $ 1,573  
Fair value at ending balance $ 1,467 [2],[3],[8],[51] $ 1,573 [1],[5],[6],[12],[50]
Interest 6.50% [2],[3],[8],[51] 6.00% [1],[5],[6],[12],[50]
Interest 10.80% [2],[3],[8],[51] 9.30% [1],[5],[6],[12],[50]
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[51] $ 19  
Interest [2],[3],[8],[51] 6.50%  
Interest [2],[3],[8],[51] 10.80%  
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[28] $ 7,106  
Fair value at ending balance $ 6,321 [2],[3],[4] $ 7,106 [1],[5],[6],[28]
Interest 6.50% [2],[3],[4] 6.50% [1],[5],[6],[28]
Interest 12.00% [2],[3],[4] 10.30% [1],[5],[6],[28]
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],[5],[6],[28] $ 137  
Fair value at ending balance $ 138 [2],[3],[4] $ 137 [1],[5],[6],[28]
Interest 6.50% [2],[3],[4] 6.50% [1],[5],[6],[28]
Interest 12.00% [2],[3],[4] 10.30% [1],[5],[6],[28]
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],[5],[6],[12],[24] $ 1,644  
Fair value at ending balance $ 1,849 [2],[3],[8],[25] $ 1,644 [1],[5],[6],[12],[24]
Interest 6.50% [2],[3],[8],[25] 6.25% [1],[5],[6],[12],[24]
Interest 10.30% [2],[3],[8],[25] 8.10% [1],[5],[6],[12],[24]
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],[5],[6],[7] $ 6,767  
Fair value at ending balance $ 4,772 [2],[3],[4] $ 6,767 [1],[5],[6],[7]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[7]
Interest 11.20% [2],[3],[4] 10.10% [1],[5],[6],[7]
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 [1],[6],[21] $ 17  
Fair value at ending balance $ 14 [3],[17] $ 17 [1],[6],[21]
Investment owned, balance (in shares) 1,160.9 [3],[9],[10],[17] 1,160.9 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 75  
Fair value at ending balance $ 63 [3],[17] $ 75 [1],[6],[21]
Investment owned, balance (in shares) 5,104.3 [3],[9],[10],[17] 5,104.3 [1],[6],[13],[14],[21]
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 [2],[3],[8],[25] $ 1,558  
Interest [2],[3],[8],[25] 6.50%  
Interest [2],[3],[8],[25] 10.20%  
Investment, Identifier [Axis]: Ferrellgas L.P., Oil & Gas Equipment & Services, Opco Preferred Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] $ 2,742  
Fair value at ending balance $ 2,597 [3] $ 2,742 [1],[6]
Investment owned, balance (in shares) 2,886 [3],[9],[10] 2,886 [1],[6],[13],[14]
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 [1],[6] $ 6,084  
Fair value at ending balance $ 6,589 [3] $ 6,084 [1],[6]
Investment, interest rate, paid in kind 11.00% [3] 11.00% [1],[6]
Investment owned, balance (in shares) 6,582.7 [3],[9],[10] 6,582.7 [1],[6],[13],[14]
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],[5],[6],[19] $ 1,270  
Fair value at ending balance $ 1,280 [2],[3],[4] $ 1,270 [1],[5],[6],[19]
Interest 4.75% [2],[3],[4] 4.75% [1],[5],[6],[19]
Interest 10.10% [2],[3],[4] 9.50% [1],[5],[6],[19]
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],[5],[6],[12],[33] $ 2,329  
Fair value at ending balance $ 4,042 [2],[3],[8],[37] $ 2,329 [1],[5],[6],[12],[33]
Interest 5.50% [2],[3],[8],[37] 6.25% [1],[5],[6],[12],[33]
Interest 9.60% [2],[3],[8],[37] 8.10% [1],[5],[6],[12],[33]
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],[5],[6],[19] $ 4,165  
Fair value at ending balance $ 4,147 [2],[3],[4] $ 4,165 [1],[5],[6],[19]
Interest 4.50% [2],[3],[4] 4.50% [1],[5],[6],[19]
Interest 10.10% [2],[3],[4] 8.90% [1],[5],[6],[19]
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 962  
Fair value at ending balance $ 1,097 [3],[17] $ 962 [1],[6],[21]
Investment owned, balance (in shares) 966.99 [3],[9],[10],[17] 966.99 [1],[6],[13],[14],[21]
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],[5],[6],[22] $ 13,295  
Fair value at ending balance $ 13,555 [2],[3],[4] $ 13,295 [1],[5],[6],[22]
Interest 7.25% [2],[3],[4] 7.25% [1],[5],[6],[22]
Interest 12.80% [2],[3],[4] 12.00% [1],[5],[6],[22]
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 [1] $ 13,827  
Fair value at ending balance $ 13,522 $ 13,827 [1]
Interest 6.90% 6.90% [1]
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 [1],[6],[12],[21] $ 1,932  
Fair value at ending balance $ 3,026 [3],[8],[17] $ 1,932 [1],[6],[12],[21]
Investment owned, balance (in shares) 2,828,286 [3],[8],[9],[10],[17] 1,921,648 [1],[6],[12],[13],[14],[21]
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],[5],[6],[12],[34] $ 1,437  
Fair value at ending balance $ 1,726 [2],[3],[8],[35] $ 1,437 [1],[5],[6],[12],[34]
Interest 6.75% [2],[3],[8],[35] 5.75% [1],[5],[6],[12],[34]
Interest 11.90% [2],[3],[8],[35] 9.20% [1],[5],[6],[12],[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],[5],[6],[28] $ 1,513  
Fair value at ending balance $ 2,262 [2],[3],[4] $ 1,513 [1],[5],[6],[28]
Interest 5.25% [2],[3],[4] 5.25% [1],[5],[6],[28]
Interest 10.60% [2],[3],[4] 9.90% [1],[5],[6],[28]
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],[5],[6],[19] $ 4,638  
Fair value at ending balance $ 4,584 [2],[3],[4] $ 4,638 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.40% [2],[3],[4] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 1,179  
Fair value at ending balance $ 871 [3],[17] $ 1,179 [1],[6],[21]
Investment owned, balance (in shares) 937.5 [3],[9],[10],[17] 937.5 [1],[6],[13],[14],[21]
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 [1],[21] $ 158  
Fair value at ending balance $ 3 [17] $ 158 [1],[21]
Investment owned, balance (in shares) 20,000 [9],[10],[17] 192,000 [1],[13],[14],[21]
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],[5],[6],[19] $ 4,871  
Fair value at ending balance 4,339 [2],[3],[4] $ 4,871 [1],[5],[6],[19]
Interest [1],[5],[6],[19]   12.50%
Interest [1],[5],[6],[19]   17.20%
Investment, Identifier [Axis]: Front Line Power Construction LLC, Construction Machinery, Super Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3] $ 190  
Interest [3] 10.00%  
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],[5],[6],[22] $ 16,271  
Fair value at ending balance [1],[5],[6],[22]   $ 16,271
Interest [1],[5],[6],[22]   6.50%
Interest [1],[5],[6],[22]   10.50%
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] 687  
Fair value at ending balance [1],[6],[21]   $ 687
Investment owned, balance (in shares) [1],[6],[13],[14],[21]   687
Investment, Identifier [Axis]: GB EAGLE BUYER, INC., Capital Goods, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] (77)  
Fair value at ending balance [1],[5],[6],[22]   $ (77)
Interest [1],[5],[6],[22]   6.50%
Interest [1],[5],[6],[22]   10.50%
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 10,399  
Interest [2],[3],[4] 6.50%  
Interest [2],[3],[4] 11.90%  
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 633  
Investment owned, balance (in shares) [3],[9],[10],[17] 687  
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ (60)  
Interest [2],[3],[4],[29] 6.50%  
Interest [2],[3],[4],[29] 11.90%  
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8],[17] $ 0  
Investment owned, balance (in shares) [3],[8],[17] 5,785  
Investment, Identifier [Axis]: GPNZ 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],[5],[6],[12],[36] $ 375  
Fair value at ending balance [1],[5],[6],[12],[36]   $ 375
Interest [1],[5],[6],[12],[36]   5.50%
Interest [1],[5],[6],[12],[36]   7.40%
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[52] $ 325  
Interest [2],[3],[8],[52] 6.00%  
Interest [2],[3],[8],[52] 9.90%  
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8] $ 34  
Investment, interest rate, paid in kind [3],[8] 10.00%  
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 [1],[6],[49] $ 10,442  
Fair value at ending balance [1],[6],[49]   $ 10,442
Interest [1],[6],[49]   11.00%
Investment, interest rate, paid in kind [1],[6],[49]   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 [1],[6],[21],[49] 2,252  
Fair value at ending balance [1],[6],[21],[49]   $ 2,252
Investment owned, balance (in shares) [1],[6],[13],[14],[21],[49]   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 [1],[6],[21],[49] 2,158  
Fair value at ending balance [1],[6],[21],[49]   $ 2,158
Investment owned, balance (in shares) [1],[6],[13],[14],[21],[49]   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],[5],[6],[12],[50] 2,438  
Fair value at ending balance $ 2,372 [2],[3],[8],[41] $ 2,438 [1],[5],[6],[12],[50]
Interest 6.00% [2],[3],[8],[41] 6.00% [1],[5],[6],[12],[50]
Interest 10.20% [2],[3],[8],[41] 9.10% [1],[5],[6],[12],[50]
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],[5],[6],[12],[53] $ 4,242  
Fair value at ending balance $ 4,065 [2],[3],[8],[54] $ 4,242 [1],[5],[6],[12],[53]
Interest 6.00% [2],[3],[8],[54] 6.00% [1],[5],[6],[12],[53]
Interest 11.70% [2],[3],[8],[54] 9.10% [1],[5],[6],[12],[53]
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],[5],[6],[12],[24] $ 716  
Fair value at ending balance $ 854 [2],[3],[8],[25] $ 716 [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25] 5.75% [1],[5],[6],[12],[24]
Interest 9.20% [2],[3],[8],[25] 7.10% [1],[5],[6],[12],[24]
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],[5],[6],[12],[24] $ 598  
Fair value at ending balance $ 1,039 [2],[3],[8],[25] $ 598 [1],[5],[6],[12],[24]
Interest 6.50% [2],[3],[8],[25] 6.25% [1],[5],[6],[12],[24]
Interest 10.50% [2],[3],[8],[25] 8.50% [1],[5],[6],[12],[24]
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],[5],[7] $ 772  
Fair value at ending balance $ 820 [2],[23] $ 772 [1],[5],[7]
Interest 6.75% [2],[23] 6.75% [1],[5],[7]
Interest 12.40% [2],[23] 11.00% [1],[5],[7]
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],[5],[6],[12],[40] $ 2,136  
Fair value at ending balance $ 2,054 [2],[3],[8],[41] $ 2,136 [1],[5],[6],[12],[40]
Interest 6.50% [2],[3],[8],[41] 6.50% [1],[5],[6],[12],[40]
Interest 10.70% [2],[3],[8],[41] 10.20% [1],[5],[6],[12],[40]
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],[5],[6],[12],[24] $ 4,846  
Fair value at ending balance $ 4,860 [2],[3],[8],[25] $ 4,846 [1],[5],[6],[12],[24]
Interest 6.50% [2],[3],[8],[25] 6.50% [1],[5],[6],[12],[24]
Interest 10.50% [2],[3],[8],[25] 8.70% [1],[5],[6],[12],[24]
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 11,475  
Interest [2],[3],[4] 8.50%  
Interest [2],[3],[4] 14.00%  
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] $ (18)  
Fair value at ending balance $ 0 [2],[3],[4],[29] $ (18) [1],[5],[6],[22]
Interest 8.50% [2],[3],[4],[29] 8.50% [1],[5],[6],[22]
Interest 14.00% [2],[3],[4],[29] 11.70% [1],[5],[6],[22]
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],[5],[6],[22] $ 11,363  
Fair value at ending balance [1],[5],[6],[22]   $ 11,363
Interest [1],[5],[6],[22]   8.50%
Interest [1],[5],[6],[22]   11.70%
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 4,928  
Fair value at ending balance $ 10,906 [2],[3],[4] $ 4,928 [1],[5],[6],[19]
Interest 6.25% [2],[3],[4] 5.00% [1],[5],[6],[19]
Interest 11.70% [2],[3],[4] 6.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] $ 5,834  
Fair value at ending balance [1],[5],[6],[7]   $ 5,834
Interest [1],[5],[6],[7]   5.00%
Interest [1],[5],[6],[7]   9.30%
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[50] 598  
Fair value at ending balance $ 585 [2],[3],[8],[41] $ 598 [1],[5],[6],[12],[50]
Interest 4.75% [2],[3],[8],[41] 5.25% [1],[5],[6],[12],[50]
Interest 8.90% [2],[3],[8],[41] 8.60% [1],[5],[6],[12],[50]
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 [1],[6] $ 1,151  
Fair value at ending balance $ 10,681 [3] $ 1,151 [1],[6]
Investment, interest rate, paid in kind 11.00% [3] 11.00% [1],[6]
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 [1],[6] $ 9,183  
Fair value at ending balance [1],[6]   $ 9,183
Investment, interest rate, paid in kind [1],[6]   11.00%
Investment, Identifier [Axis]: Heartland, LLC, Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 13,795  
Fair value at ending balance $ 13,680 [2],[3],[23] $ 13,795 [1],[5],[6],[19]
Interest 4.75% [2],[3],[23] 4.75% [1],[5],[6],[19]
Interest 10.20% [2],[3],[23] 9.50% [1],[5],[6],[19]
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],[5],[6],[7] $ 7,276  
Fair value at ending balance $ 7,313 [2],[3],[23] $ 7,276 [1],[5],[6],[7]
Interest 5.50% [2],[3],[23] 5.75% [1],[5],[6],[7]
Interest 10.80% [2],[3],[23] 9.90% [1],[5],[6],[7]
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],[5],[6],[7] $ (33)  
Fair value at ending balance $ 0 [2],[3],[23],[29] $ (33) [1],[5],[6],[7]
Interest 5.50% [2],[3],[23],[29] 5.75% [1],[5],[6],[7]
Interest 10.80% [2],[3],[23],[29] 9.90% [1],[5],[6],[7]
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],[5],[6],[12],[24] $ 3,148  
Fair value at ending balance $ 3,078 [2],[3],[8],[37] $ 3,148 [1],[5],[6],[12],[24]
Interest 5.00% [2],[3],[8],[37] 5.00% [1],[5],[6],[12],[24]
Interest 8.90% [2],[3],[8],[37] 6.90% [1],[5],[6],[12],[24]
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 101  
Investment owned, balance (in shares) [3],[17] 101,080  
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 7,382  
Interest [2],[3],[4] 6.00%  
Interest [2],[3],[4] 11.40%  
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ (45)  
Interest [2],[3],[4],[29] 6.00%  
Interest [2],[3],[4],[29] 11.40%  
Investment, Identifier [Axis]: Holland Acquisition Corp., Energy: Oil & Gas, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[16],[18],[31] $ 0  
Fair value at ending balance $ 0 [2],[3],[15],[20],[32] $ 0 [1],[5],[6],[16],[18],[31]
Interest 9.00% [2],[3],[15],[20],[32] 9.00% [1],[5],[6],[16],[18],[31]
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],[5],[6],[28] $ 3,621  
Fair value at ending balance $ 3,441 [2],[3],[4] $ 3,621 [1],[5],[6],[28]
Interest 5.00% [2],[3],[4] 5.00% [1],[5],[6],[28]
Interest 10.50% [2],[3],[4] 9.40% [1],[5],[6],[28]
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],[5],[6],[12],[30] $ 7,814  
Fair value at ending balance $ 6,407 [2],[3],[8],[32] $ 7,814 [1],[5],[6],[12],[30]
Interest 4.85% [2],[3],[8],[32] 5.25% [1],[5],[6],[12],[30]
Interest 10.40% [2],[3],[8],[32] 9.50% [1],[5],[6],[12],[30]
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],[5],[6],[12],[24] $ 1,665  
Fair value at ending balance $ 1,663 [2],[3],[8],[37] $ 1,665 [1],[5],[6],[12],[24]
Interest 6.25% [2],[3],[8],[37] 6.25% [1],[5],[6],[12],[24]
Interest 10.40% [2],[3],[8],[37] 8.40% [1],[5],[6],[12],[24]
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 (910) (723)
Fair value at ending balance 3,586 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 [1],[6],[21] $ 4,496  
Fair value at ending balance $ 3,586 [3],[11],[17] $ 4,496 [1],[6],[21]
Investment owned, balance (in shares) 102,144 [3],[9],[10],[11],[17] 102,144 [1],[6],[13],[14],[21]
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],[5],[6],[22] $ 3,917  
Fair value at ending balance $ 3,917 [2],[3],[4],[11] $ 3,917 [1],[5],[6],[22]
Interest 8.00% [2],[3],[4],[11] 8.00% [1],[5],[6],[22]
Interest 13.10% [2],[3],[4],[11] 12.30% [1],[5],[6],[22]
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],[5],[6],[22] $ 4,098  
Fair value at ending balance $ 4,441 [2],[3],[4],[11] $ 4,098 [1],[5],[6],[22]
Interest 10.00% [2],[3],[4],[11] 10.00% [1],[5],[6],[22]
Interest 15.30% [2],[3],[4],[11] 14.30% [1],[5],[6],[22]
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 56 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 (56) 247
Fair value at ending balance 3,917 3,917
Amount of Interest or Dividends Credited to Income $ 441 $ 380
Interest 8.00% 8.00%
Interest 13.10% 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 343 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 4,441 4,098
Amount of Interest or Dividends Credited to Income $ 491 $ 382
Interest 15.30% 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],[5],[6],[7] $ 3,247  
Fair value at ending balance $ 3,328 [2],[3],[32] $ 3,247 [1],[5],[6],[7]
Interest 6.50% [2],[3],[32] 8.00% [1],[5],[6],[7]
Interest 12.10% [2],[3],[32] 12.40% [1],[5],[6],[7]
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 [1],[6],[21] $ 0  
Fair value at ending balance $ 0 [3],[17] $ 0 [1],[6],[21]
Investment owned, balance (in shares) 68,950 [3],[9],[10],[17] 68,950 [1],[6],[13],[14],[21]
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],[5],[6],[12],[24] $ 2,583  
Fair value at ending balance $ 2,594 [2],[3],[8],[25] $ 2,583 [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25] 5.25% [1],[5],[6],[12],[24]
Interest 9.50% [2],[3],[8],[25] 7.50% [1],[5],[6],[12],[24]
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],[5],[6],[12],[24] $ 4,892  
Fair value at ending balance $ 5,474 [2],[3],[8],[25] $ 4,892 [1],[5],[6],[12],[24]
Interest 5.37% [2],[3],[8],[25] 5.40% [1],[5],[6],[12],[24]
Interest 9.30% [2],[3],[8],[25] 7.40% [1],[5],[6],[12],[24]
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 [1],[6],[21] $ 127  
Fair value at ending balance $ 772 [3],[17] $ 127 [1],[6],[21]
Investment owned, balance (in shares) 7,500.4 [3],[9],[10],[17] 1,433.37 [1],[6],[13],[14],[21]
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],[5],[6],[7] $ 703  
Fair value at ending balance $ 12,842 [2],[3],[4] $ 703 [1],[5],[6],[7]
Interest 6.50% [2],[3],[4] 4.75% [1],[5],[6],[7]
Interest 11.90% [2],[3],[4] 9.10% [1],[5],[6],[7]
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],[5],[6],[7] $ 5  
Fair value at ending balance $ 29 [2],[3],[4] $ 5 [1],[5],[6],[7]
Interest 6.50% [2],[3],[4] 4.75% [1],[5],[6],[7]
Interest 11.90% [2],[3],[4] 9.10% [1],[5],[6],[7]
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],[5],[6],[12],[33] $ 2,729  
Fair value at ending balance $ 2,753 [2],[3],[8],[37] $ 2,729 [1],[5],[6],[12],[33]
Interest 4.75% [2],[3],[8],[37] 5.25% [1],[5],[6],[12],[33]
Interest 8.70% [2],[3],[8],[37] 6.20% [1],[5],[6],[12],[33]
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],[5],[6],[12],[33] $ 5,495  
Fair value at ending balance [1],[5],[6],[12],[33]   $ 5,495
Interest [1],[5],[6],[12],[33]   6.50%
Interest [1],[5],[6],[12],[33]   9.30%
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[37] $ 5,912  
Interest [2],[3],[8],[37] 6.50%  
Interest [2],[3],[8],[37] 10.40%  
Investment, Identifier [Axis]: Innovad Group II BV, Beverage, Food & Tobacco, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[55] $ 947  
Interest [2],[3],[8],[55] 6.50%  
Interest [2],[3],[8],[55] 8.20%  
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],[5],[16],[31] $ 2,277  
Fair value at ending balance $ 2,353 [2],[15],[32] $ 2,277 [1],[5],[16],[31]
Interest 4.25% [2],[15],[32] 4.25% [1],[5],[16],[31]
Interest 9.90% [2],[15],[32] 7.80% [1],[5],[16],[31]
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],[5],[6],[12],[24] $ 1,239  
Fair value at ending balance $ 1,450 [2],[3],[8],[25] $ 1,239 [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25] 5.25% [1],[5],[6],[12],[24]
Interest 9.40% [2],[3],[8],[25] 7.50% [1],[5],[6],[12],[24]
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],[5],[7],[16] $ 2,658  
Fair value at ending balance $ 2,624 [2],[15],[23] $ 2,658 [1],[5],[7],[16]
Interest 7.50% [2],[15],[23] 7.50% [1],[5],[7],[16]
Interest 12.90% [2],[15],[23] 11.90% [1],[5],[7],[16]
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17],[56] $ 0  
Investment owned, balance (in shares) [3],[9],[10],[17],[56] 58,538  
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[16],[18],[19] $ 553  
Fair value at ending balance $ 707 [2],[3],[4],[15] $ 553 [1],[5],[6],[16],[18],[19]
Interest 5.60% [2],[3],[4],[15] 5.75% [1],[5],[6],[16],[18],[19]
Interest [2],[3],[4],[15] 10.60%  
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), Trading Companies & Distributors, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[36] $ 4,436  
Fair value at ending balance $ 4,458 [2],[3],[8],[25] $ 4,436 [1],[5],[6],[12],[36]
Interest 6.50% [2],[3],[8],[25] 6.50% [1],[5],[6],[12],[36]
Interest 10.20% [2],[3],[8],[25] 8.10% [1],[5],[6],[12],[36]
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],[5],[16],[19] $ 3,383  
Fair value at ending balance $ 4,270 [2],[4],[15] $ 3,383 [1],[5],[16],[19]
Interest 7.25% [2],[4],[15] 7.25% [1],[5],[16],[19]
Interest 12.80% [2],[4],[15] 12.00% [1],[5],[16],[19]
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],[5],[6],[7] $ 3,575  
Fair value at ending balance $ 3,729 [2],[3],[4] $ 3,575 [1],[5],[6],[7]
Interest 5.50% [2],[3],[4] 5.50% [1],[5],[6],[7]
Interest 11.00% [2],[3],[4] 9.90% [1],[5],[6],[7]
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],[5],[6],[12],[33] 4,009  
Fair value at ending balance $ 1,125 [2],[3],[8],[37] $ 4,009 [1],[5],[6],[12],[33]
Interest 5.25% [2],[3],[8],[37] 5.50% [1],[5],[6],[12],[33]
Interest 9.00% [2],[3],[8],[37] 7.90% [1],[5],[6],[12],[33]
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],[5],[6],[12],[30] $ 6,592  
Fair value at ending balance $ 6,634 [2],[3],[8],[32] $ 6,592 [1],[5],[6],[12],[30]
Interest 5.25% [2],[3],[8],[32] 5.50% [1],[5],[6],[12],[30]
Interest 10.30% [2],[3],[8],[32] 9.30% [1],[5],[6],[12],[30]
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],[5],[6],[22] $ 7,617  
Fair value at ending balance [1],[5],[6],[22]   $ 7,617
Interest [1],[5],[6],[22]   5.00%
Interest [1],[5],[6],[22]   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],[5],[6],[22] (2)  
Fair value at ending balance [1],[5],[6],[22]   $ (2)
Interest [1],[5],[6],[22]   5.00%
Interest [1],[5],[6],[22]   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 [1],[6],[49] 2,650  
Fair value at ending balance [1],[6],[49]   $ 2,650
Interest [1],[6],[49]   12.00%
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 3,511  
Fair value at ending balance [1]   $ 3,511
Interest [1]   8.00%
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Structured Products, Structured Secured Note - Class B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance $ 3,367  
Interest 8.00%  
Investment, Identifier [Axis]: Jocassee Partners LLC, Investment Funds & Vehicles, 9.1% Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[12] $ 40,088  
Fair value at ending balance [1],[12]   $ 40,088
Investment, Identifier [Axis]: Jocassee Partners LLC, Investment Funds & Vehicles, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[11] 41,233  
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 1,145 (2,513)
Fair value at ending balance 41,233 40,088
Amount of Interest or Dividends Credited to Income 4,282 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],[5],[6],[12],[53] 3,477  
Fair value at ending balance $ 3,637 [2],[3],[8],[29],[54] $ 3,477 [1],[5],[6],[12],[53]
Interest 4.50% [2],[3],[8],[29],[54] 5.50% [1],[5],[6],[12],[53]
Interest 10.30% [2],[3],[8],[29],[54] 10.20% [1],[5],[6],[12],[53]
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],[5],[6],[19] $ 2,745  
Fair value at ending balance $ 2,715 [2],[3],[4] $ 2,745 [1],[5],[6],[19]
Interest 5.50% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 10.80% [2],[3],[4] 10.20% [1],[5],[6],[19]
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 [2],[3],[4] $ 679  
Interest [2],[3],[4] 5.50%  
Interest [2],[3],[4] 10.80%  
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 [1],[6],[21] $ 115  
Fair value at ending balance $ 221 [3] $ 115 [1],[6],[21]
Investment owned, balance (in shares) 1,018 [3],[9],[10] 974.68 [1],[13],[14],[21]
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],[5],[6],[19] $ (6)  
Fair value at ending balance $ (10) [2],[3],[4],[29] $ (6) [1],[5],[6],[19]
Interest 5.50% [2],[3],[4],[29] 5.75% [1],[5],[6],[19]
Interest 10.80% [2],[3],[4],[29] 10.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[31] $ 5,545  
Fair value at ending balance $ 5,545 [2],[3],[4],[29] $ 5,545 [1],[5],[6],[31]
Interest 5.00% [4],[29] 5.00% [1],[5],[6],[31]
Interest 10.50% [4],[29] 10.10% [1],[5],[6],[31]
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 [1],[6],[21] $ 191  
Fair value at ending balance $ 226 [3],[17] $ 191 [1],[6],[21]
Investment owned, balance (in shares) 203.2 [9],[10],[17] 203.2 [1],[6],[13],[14],[21]
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 1,155 (408)
Fair value at ending balance 2,336 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 198 2,785
Gross Reductions (1,051) (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 712 1,565
Amount of Interest or Dividends Credited to Income $ 149 $ 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 [1],[6],[16],[21] $ 1,181  
Fair value at ending balance $ 2,336 [3],[11],[15],[17] $ 1,181 [1],[6],[16],[21]
Investment owned, balance (in shares) 6.78 [3],[9],[10],[11],[15],[17] 6.78 [1],[6],[13],[14],[16],[21]
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 [1],[6],[16] $ 1,565  
Fair value at ending balance $ 712 [3],[11],[15] $ 1,565 [1],[6],[16]
Investment, interest rate, paid in kind 15.00% [3],[11],[15] 15.00% [1],[6],[16]
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],[5],[6],[19] $ 7,027  
Fair value at ending balance $ 7,031 [2],[3],[4] $ 7,027 [1],[5],[6],[19]
Interest 4.25% [4] 4.25% [1],[5],[6],[19]
Interest 9.60% [4] 9.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 9,125  
Fair value at ending balance $ 9,101 [2],[3],[4] $ 9,125 [1],[5],[6],[19]
Interest 5.50% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.00% [2],[3],[4] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 577  
Fair value at ending balance $ 658 [3],[17] $ 577 [1],[6],[21]
Investment owned, balance (in shares) 637,677.11 [3],[9],[10],[17] 637,677.11 [1],[6],[13],[14],[21]
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],[5],[6],[22] $ 8,623  
Fair value at ending balance $ 8,626 [2],[3],[4] $ 8,623 [1],[5],[6],[22]
Interest 4.75% [2],[3],[4] 4.75% [1],[5],[6],[22]
Interest 10.10% [2],[3],[4] 9.30% [1],[5],[6],[22]
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],[5],[6],[12],[24] $ 4,397  
Fair value at ending balance $ 1,737 [2],[3],[8],[25],[29] $ 4,397 [1],[5],[6],[12],[24]
Interest 6.50% [2],[3],[8],[25],[29] 6.00% [1],[5],[6],[12],[24]
Interest 10.50% [2],[3],[8],[25],[29] 8.50% [1],[5],[6],[12],[24]
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 [1],[6],[12] $ 1,409  
Fair value at ending balance $ 1,386 [3],[8] $ 1,409 [1],[6],[12]
Investment, interest rate, paid in kind 12.00% [3],[8] 12.00% [1],[6],[12]
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],[5],[6],[12],[30] $ 633  
Fair value at ending balance $ 655 [2],[3],[8],[29],[32] $ 633 [1],[5],[6],[12],[30]
Interest 5.75% [2],[3],[8],[29],[32] 5.25% [1],[5],[6],[12],[30]
Interest 10.60% [2],[3],[8],[29],[32] 8.30% [1],[5],[6],[12],[30]
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],[5],[6],[12],[22] $ 34  
Fair value at ending balance $ 16 [2],[3],[8],[29],[32] $ 34 [1],[5],[6],[12],[22]
Interest 5.75% [2],[3],[8],[29],[32] 5.25% [1],[5],[6],[12],[22]
Interest 10.60% [2],[3],[8],[29],[32] 9.80% [1],[5],[6],[12],[22]
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],[5],[6],[19] $ 10,150  
Fair value at ending balance $ 9,945 [2],[3],[4] $ 10,150 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4] 4.75% [1],[5],[6],[19]
Interest 11.10% [2],[3],[4] 9.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 65  
Fair value at ending balance $ 184 [3] $ 65 [1],[6],[21]
Investment owned, balance (in shares) 81,664.1 [3],[9],[10] 52,493.44 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ (32)  
Fair value at ending balance $ (65) [2],[3],[4],[29] $ (32) [1],[5],[6],[19]
Interest 5.75% [2],[3],[4],[29] 4.75% [1],[5],[6],[19]
Interest 11.10% [2],[3],[4],[29] 9.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[7] $ 100  
Fair value at ending balance $ 5,352 [2],[23] $ 100 [1],[5],[7]
Interest 5.50% [2],[23] 3.25% [1],[5],[7]
Interest 10.80% [2],[23] 7.60% [1],[5],[7]
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 [1],[19] $ 8,455  
Fair value at ending balance $ 3,589 [3],[17] $ 8,455 [1],[19]
Interest [1],[19]   10.00%
Interest [1],[19]   3.00%
Investment owned, balance (in shares) [3],[9],[10],[17] 94,441  
Investment, Identifier [Axis]: Legal Solutions Holdings, Business Services, Senior Subordinated Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[18],[49] $ 0  
Fair value at ending balance $ 0 [3],[20],[57] $ 0 [1],[6],[18],[49]
Investment, interest rate, paid in kind 16.00% [3],[20],[57] 16.00% [1],[6],[18],[49]
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],[5],[6],[28] $ 19,846  
Fair value at ending balance $ 19,960 [2],[3],[4] $ 19,846 [1],[5],[6],[28]
Interest 4.50% [2],[3],[4] 4.50% [1],[5],[6],[28]
Interest 9.80% [2],[3],[4] 8.80% [1],[5],[6],[28]
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],[5],[6],[16],[19] $ 2,980  
Fair value at ending balance $ 2,795 [2],[3],[4],[15] $ 2,980 [1],[5],[6],[16],[19]
Interest 7.00% [2],[3],[4],[15] 7.00% [1],[5],[6],[16],[19]
Interest 12.50% [2],[3],[4],[15] 10.70% [1],[5],[6],[16],[19]
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[16],[19] $ (168)  
Fair value at ending balance $ (175) [2],[3],[4],[15],[29] $ (168) [1],[5],[6],[16],[19]
Interest 7.00% [2],[3],[4],[15],[29] 7.00% [1],[5],[6],[16],[19]
Interest 12.50% [2],[3],[4],[15],[29] 10.70% [1],[5],[6],[16],[19]
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 837  
Fair value at ending balance $ 859 [2],[3],[4] $ 837 [1],[5],[6],[19]
Interest 5.00% [4] 5.00% [1],[5],[6],[19]
Interest 10.50% [4] 9.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: LogMeIn, Inc., High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[7],[16] $ 1,253  
Fair value at ending balance $ 1,282 [2],[15],[23] $ 1,253 [1],[5],[7],[16]
Interest 4.75% [2],[15],[23] 4.75% [1],[5],[7],[16]
Interest 10.30% [2],[15],[23] 9.10% [1],[5],[7],[16]
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],[5],[6],[7] $ 7,816  
Fair value at ending balance $ 6,328 [2],[3],[23] $ 7,816 [1],[5],[6],[7]
Interest 1.00% [2],[3],[23] 6.00% [1],[5],[6],[7]
Interest 6.30% [2],[3],[23] 10.30% [1],[5],[6],[7]
Investment, interest rate, paid in kind [23] 6.00%  
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] $ 4,123  
Fair value at ending balance $ 4,135 [2],[3],[4] $ 4,123 [1],[5],[6],[7]
Interest 5.50% [2],[3],[4] 5.50% [1],[5],[6],[7]
Interest 11.00% [2],[3],[4] 9.90% [1],[5],[6],[7]
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 [1],[6],[21] $ 781  
Fair value at ending balance $ 829 [3],[17] $ 781 [1],[6],[21]
Investment owned, balance (in shares) 746.66 [3],[9],[10],[17] 746.66 [1],[6],[13],[14],[21]
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],[5],[6],[7] $ 835  
Fair value at ending balance $ 904 [2],[3],[23] $ 835 [1],[5],[6],[7]
Interest 5.50% [2],[3],[23] 5.50% [1],[5],[6],[7]
Interest 10.90% [2],[3],[23] 9.90% [1],[5],[6],[7]
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 [1],[6],[21] $ 54  
Fair value at ending balance $ 72 [3],[17] $ 54 [1],[6],[21]
Investment owned, balance (in shares) 76,923 [3],[9],[10],[17] 76.92 [1],[6],[13],[14],[21]
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 2,467 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 9,616 7,149
Amount of Interest or Dividends Credited to Income $ 439 $ 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 4,863 1,976
Fair value at ending balance 14,538 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 [1],[6],[12],[49] $ 7,149  
Fair value at ending balance $ 9,616 [3],[8],[44],[57] $ 7,149 [1],[6],[12],[49]
Interest 4.50% [3],[8],[44],[57] 6.00% [1],[6],[12],[13],[14],[49]
Investment, interest rate, paid in kind [3],[8],[44],[57] 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 [1],[6],[12],[21],[49] $ 9,675  
Fair value at ending balance $ 14,538 [3],[8],[17],[44],[57] $ 9,675 [1],[6],[12],[21],[49]
Investment owned, balance (in shares) 18,000 [3],[8],[9],[10],[17],[44],[57] 18,000 [1],[6],[12],[13],[14],[21],[49]
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 (15) 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 (6) (143)
Fair value at ending balance 24 45
Amount of Interest or Dividends Credited to Income $ 80 $ (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 [1],[12],[49] $ 45  
Fair value at ending balance $ 24 [8],[44],[57] $ 45 [1],[12],[49]
Investment owned, balance (in shares) 1,831.4 [8],[9],[10],[44],[57] 1,831.4 [1],[12],[13],[14],[49]
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 [1],[12],[49] $ 1,793  
Fair value at ending balance $ 981 [8],[17],[44],[57] $ 1,793 [1],[12],[49]
Investment owned, balance (in shares) 71,790.4 [8],[9],[10],[17],[44],[57] 71,790.4 [1],[12],[13],[14],[49]
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 (580) 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 (232) (5,583)
Fair value at ending balance 981 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 [1],[12],[16] $ 4,450  
Fair value at ending balance $ 4,987 [4],[8],[15] $ 4,450 [1],[12],[16]
Interest 9.03% [4],[8],[15] 8.77% [1],[12],[16]
Interest 14.30% [4],[8],[15] 12.80% [1],[12],[16]
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 [1],[12],[16] $ 7,992  
Fair value at ending balance 9,283 [8],[15] $ 7,992 [1],[12],[16]
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],[5],[6],[12],[33] 2,093  
Fair value at ending balance $ 1,913 [2],[3],[8],[25] $ 2,093 [1],[5],[6],[12],[33]
Interest 6.75% [2],[3],[8],[25] 6.00% [1],[5],[6],[12],[33]
Interest 3.90% [2],[3],[8],[25] 8.80% [1],[5],[6],[12],[33]
Investment, interest rate, paid in kind [2],[3],[8],[25] 6.80%  
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[24] $ 40  
Fair value at ending balance $ 25 [2],[3],[8],[25] $ 40 [1],[5],[6],[12],[24]
Interest 3.20% [2],[3],[8],[25] 5.00% [1],[5],[6],[12],[24]
Interest 5.80% [2],[3],[8],[25] 7.80% [1],[5],[6],[12],[24]
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],[5],[6],[22] $ 10,794  
Fair value at ending balance $ 10,591 [2],[3],[4] $ 10,794 [1],[5],[6],[22]
Interest 5.50% [2],[3],[4] 5.50% [1],[5],[6],[22]
Interest 11.00% [2],[3],[4] 9.80% [1],[5],[6],[22]
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],[5],[6],[58] $ 1,217  
Fair value at ending balance $ 1,599 [2],[3],[4] $ 1,217 [1],[5],[6],[58]
Interest 5.50% [2],[3],[4] 4.50% [1],[5],[6],[58]
Interest 11.00% [2],[3],[4] 11.50% [1],[5],[6],[58]
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],[5],[6],[22] $ 2,903  
Fair value at ending balance $ 2,826 [2],[3],[4] $ 2,903 [1],[5],[6],[22]
Interest 6.00% [2],[3],[4] 5.50% [1],[5],[6],[22]
Interest 11.70% [2],[3],[4] 10.30% [1],[5],[6],[22]
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],[5],[6],[45] $ 3,894  
Fair value at ending balance $ 3,853 [2],[3],[35] $ 3,894 [1],[5],[6],[45]
Interest 6.00% [2],[3],[35] 6.00% [1],[5],[6],[45]
Interest 11.20% [2],[3],[35] 9.40% [1],[5],[6],[45]
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],[5],[12],[34] $ 7,449  
Fair value at ending balance $ 8,075 [2],[8],[39] $ 7,449 [1],[5],[12],[34]
Interest 6.00% [2],[8],[39] 6.00% [1],[5],[12],[34]
Interest 11.40% [2],[8],[39] 9.40% [1],[5],[12],[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],[5],[7] $ 4,067  
Fair value at ending balance $ 3,946 [2],[4] $ 4,067 [1],[5],[7]
Interest 7.00% [2],[4] 7.00% [1],[5],[7]
Interest 12.50% [2],[4] 11.40% [1],[5],[7]
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 [1],[6],[12],[21] $ 116  
Fair value at ending balance $ 119 [3],[8],[17] $ 116 [1],[6],[12],[21]
Investment owned, balance (in shares) 114.4 [3],[8],[9],[10],[17] 114.4 [1],[6],[12],[13],[14],[21]
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 [1],[6],[12],[21] $ 0  
Fair value at ending balance $ 48 [3],[8],[17] $ 0 [1],[6],[12],[21]
Investment owned, balance (in shares) 28,943.8 [3],[8],[9],[10],[17] 28,943.8 [1],[6],[12],[13],[14],[21]
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],[5],[6],[12],[59] $ 3,102  
Fair value at ending balance $ 2,895 [2],[3],[8],[60] $ 3,102 [1],[5],[6],[12],[59]
Interest 5.50% [2],[3],[8],[60] 6.00% [1],[5],[6],[12],[59]
Interest 10.00% [2],[3],[8],[60] 9.10% [1],[5],[6],[12],[59]
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],[5],[6],[12],[26] $ 7,634  
Fair value at ending balance $ 7,211 [2],[3],[8],[27],[29] $ 7,634 [1],[5],[6],[12],[26]
Interest 5.50% [2],[3],[8],[27],[29] 6.25% [1],[5],[6],[12],[26]
Interest 9.60% [2],[3],[8],[27],[29] 9.10% [1],[5],[6],[12],[26]
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8],[17] $ 131  
Investment owned, balance (in shares) [3],[8],[9],[10],[17] 107,714  
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[29],[35] $ 1,743  
Interest [2],[3],[8],[29],[35] 6.25%  
Interest [2],[3],[8],[29],[35] 11.70%  
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],[5],[6],[12],[38] $ 1,150  
Fair value at ending balance $ 1,233 [2],[3],[8],[29],[39] $ 1,150 [1],[5],[6],[12],[38]
Interest 5.50% [2],[3],[8],[29],[39] 5.00% [1],[5],[6],[12],[38]
Interest 10.20% [2],[3],[8],[29],[39] 8.20% [1],[5],[6],[12],[38]
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],[5],[6],[7] $ 6,816  
Fair value at ending balance $ 6,872 [2],[3],[4] $ 6,816 [1],[5],[6],[7]
Interest 6.00% [2],[3],[4] 5.50% [1],[5],[6],[7]
Interest 11.50% [2],[3],[4] 9.80% [1],[5],[6],[7]
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Equity Co Invest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 473  
Investment owned, balance (in shares) [9],[10],[17] 472,512  
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ 14,583  
Interest [2],[3],[4],[29] 5.75%  
Interest [2],[3],[4],[29] 11.20%  
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ (47)  
Interest [2],[3],[4],[29] 5.75%  
Interest [2],[3],[4],[29] 11.20%  
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 6,220  
Interest [2],[3],[4] 6.50%  
Interest [2],[3],[4] 11.90%  
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 659  
Investment owned, balance (in shares) [3],[9],[10],[17] 639,510  
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 414  
Interest [2],[3],[4] 6.50%  
Interest [2],[3],[4] 11.90%  
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],[5],[6],[7] $ 4,697  
Fair value at ending balance $ 4,666 [2],[3],[23] $ 4,697 [1],[5],[6],[7]
Interest 4.00% [2],[3],[23] 4.25% [1],[5],[6],[7]
Interest 9.40% [2],[3],[23] 8.60% [1],[5],[6],[7]
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],[5],[6],[12],[24] $ 2,084  
Fair value at ending balance $ 2,079 [2],[3],[8],[25] $ 2,084 [1],[5],[6],[12],[24]
Interest 6.00% [2],[3],[8],[25] 6.25% [1],[5],[6],[12],[24]
Interest 10.00% [2],[3],[8],[25] 8.50% [1],[5],[6],[12],[24]
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],[5],[6],[12],[40] $ 16,963  
Fair value at ending balance $ 16,772 [2],[3],[8],[51] $ 16,963 [1],[5],[6],[12],[40]
Interest 6.50% [2],[3],[8],[51] 6.00% [1],[5],[6],[12],[40]
Interest 10.00% [2],[3],[8],[51] 9.60% [1],[5],[6],[12],[40]
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 [1],[6],[21] $ 300  
Fair value at ending balance $ 525 [3],[17] $ 300 [1],[6],[21]
Investment owned, balance (in shares) 4,587.38 [3],[9],[10],[17] 4,587.38 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 0  
Fair value at ending balance $ 123 [3],[17] $ 0 [1],[6],[21]
Investment owned, balance (in shares) 509.71 [3],[9],[10],[17] 509.71 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 5,096  
Fair value at ending balance $ 5,568 [2],[3],[4] $ 5,096 [1],[5],[6],[19]
Interest 5.00% [2],[3],[4] 5.50% [1],[5],[6],[19]
Interest 10.50% [2],[3],[4] 10.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 5  
Fair value at ending balance $ (10) [2],[3],[4],[29] $ 5 [1],[5],[6],[19]
Interest 5.00% [2],[3],[4],[29] 5.50% [1],[5],[6],[19]
Interest 10.50% [2],[3],[4],[29] 10.20% [1],[5],[6],[19]
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],[5],[6],[7] $ 2,649  
Fair value at ending balance [1],[5],[6],[7]   $ 2,649
Interest [1],[5],[6],[7]   5.25%
Interest [1],[5],[6],[7]   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],[5],[6],[28] 2,918  
Fair value at ending balance $ 2,640 [2],[3],[23] $ 2,918 [1],[5],[6],[28]
Interest 5.25% [2],[3],[23] 5.25% [1],[5],[6]
Interest 10.60% [2],[3],[23] 9.60% [1],[5],[6]
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 [2],[3],[23] $ 2,947  
Interest [2],[3],[23] 2.25%  
Interest [2],[3],[23] 7.60%  
Investment, interest rate, paid in kind [2],[3],[23] 3.00%  
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 [2],[3],[8],[37] $ 1,997  
Interest [2],[3],[8],[37] 6.50%  
Interest [2],[3],[8],[37] 10.50%  
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[38] $ 1,508  
Fair value at ending balance [1],[5],[6],[12],[38]   $ 1,508
Interest [1],[5],[6],[12],[38]   5.25%
Interest [1],[5],[6],[12],[38]   7.40%
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 ending balance [2],[3],[8],[32] $ 126  
Interest [2],[3],[8],[32] 5.25%  
Interest [2],[3],[8],[32] 10.70%  
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 ending balance [39] $ 1,642  
Interest [39] 5.00%  
Interest [39] 9.20%  
Investment, Identifier [Axis]: Nexus Underwriting Management Limited, Other Financial, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[38] $ 184  
Fair value at ending balance $ 93 [2],[3],[8],[39] $ 184 [1],[5],[6],[12],[38]
Interest 5.00% [2],[3],[8],[39] 5.25% [1],[5],[6],[12],[38]
Interest 9.20% [2],[3],[8],[39] 7.40% [1],[5],[6],[12],[38]
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],[5],[6],[19] $ 2,446  
Fair value at ending balance $ 2,437 [2],[3],[4] $ 2,446 [1],[5],[6],[19]
Interest 4.75% [2],[3],[4] 4.75% [1],[5],[6],[19]
Interest 10.00% [2],[3],[4] 9.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Novotech Aus Bidco Pty Ltd, Healthcare, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[40] $ 3,406  
Fair value at ending balance $ 3,975 [2],[3],[8],[32] $ 3,406 [1],[5],[6],[12],[40]
Interest 5.25% [2],[3],[8],[32] 5.25% [1],[5],[6],[12],[40]
Interest 10.70% [2],[3],[8],[32] 8.80% [1],[5],[6],[12],[40]
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],[5],[6],[12],[30] $ 443  
Fair value at ending balance [1],[5],[6],[12],[30]   $ 443
Interest [1],[5],[6],[12],[30]   5.75%
Interest [1],[5],[6],[12],[30]   9.60%
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] 5,501  
Fair value at ending balance $ 5,498 [2],[3],[23] $ 5,501 [1],[5],[6],[7]
Interest 5.50% [2],[3],[23] 5.75% [1],[5],[6],[7]
Interest 10.80% [2],[3],[23] 10.10% [1],[5],[6],[7]
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 [1],[6],[21] $ 226  
Fair value at ending balance $ 297 [3],[17] $ 226 [1],[6],[21]
Investment owned, balance (in shares) 210,920.11 [3],[9],[10],[17] 210,920.11 [1],[6],[13],[14],[21]
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],[5],[6],[7] $ (21)  
Fair value at ending balance $ (14) [2],[3],[23],[29] $ (21) [1],[5],[6],[7]
Interest 5.50% [2],[3],[23],[29] 5.75% [1],[5],[6],[7]
Interest 10.80% [2],[3],[23],[29] 10.10% [1],[5],[6],[7]
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],[5],[6],[30] $ 3,567  
Fair value at ending balance $ 3,360 [2],[3],[4] $ 3,567 [1],[5],[6],[30]
Interest 5.00% [2],[3],[4] 5.00% [1],[5],[6],[30]
Interest 10.30% [2],[3],[4] 10.00% [1],[5],[6],[30]
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],[5],[6],[30] $ 743  
Fair value at ending balance $ (89) [2],[3],[4],[29] $ 743 [1],[5],[6],[30]
Interest 5.00% [2],[3],[4],[29] 5.00% [1],[5],[6],[30]
Interest 10.30% [2],[3],[4],[29] 10.00% [1],[5],[6],[30]
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],[5],[6],[12],[24] $ 3,310  
Fair value at ending balance $ 3,313 [2],[3],[8],[25] $ 3,310 [1],[5],[6],[12],[24]
Interest 5.75% [2],[3],[8],[25] 5.75% [1],[5],[6],[12],[24]
Interest 9.70% [2],[3],[8],[25] 7.90% [1],[5],[6],[12],[24]
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],[5],[6],[19] $ 2,190  
Fair value at ending balance [1],[5],[6],[19]   $ 2,190
Interest [1],[5],[6],[19]   6.00%
Interest [1],[5],[6],[19]   10.20%
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] 2,206  
Fair value at ending balance $ 2,204 [2],[3],[4] $ 2,206 [1],[5],[6],[22]
Interest 6.00% [2],[3],[4] 6.00% [1],[5],[6],[22]
Interest 11.50% [2],[3],[4] 10.50% [1],[5],[6],[22]
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 2,220  
Interest [2],[3],[4] 6.00%  
Interest [2],[3],[4] 11.50%  
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 4,612  
Interest [2],[3],[4] 6.25%  
Interest [2],[3],[4] 11.70%  
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 [1],[6],[21] $ 221  
Fair value at ending balance $ 554 [3],[17] $ 221 [1],[6],[21]
Investment owned, balance (in shares) 347,497 [3],[9],[10],[17] 60,040 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ (6)  
Fair value at ending balance $ (5) [2],[3],[4],[29] $ (6) [1],[5],[6],[19]
Interest 6.00% [2],[3],[4],[29] 6.00% [1],[5],[6],[19]
Interest 11.50% [2],[3],[4],[29] 10.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: Ocular Therapeutix, Inc., Pharma-ceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[23] $ 3,812  
Interest [2],[23] 6.75%  
Interest [2],[23] 12.10%  
Investment, Identifier [Axis]: Offen Inc., Transportation: Cargo, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[7],[16] $ 3,627  
Fair value at ending balance $ 3,694 [3],[15],[32] $ 3,627 [1],[6],[7],[16]
Interest 5.00% [3],[15],[32] 5.00% [1],[6],[7],[16]
Interest 10.50% [3],[15],[32] 8.40% [1],[6],[7],[16]
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],[5],[6],[22] $ 5,995  
Fair value at ending balance $ 8,318 [2],[3],[4] $ 5,995 [1],[5],[6],[22]
Interest 5.00% [2],[3],[4] 5.00% [1],[5],[6],[22]
Interest 10.40% [2],[3],[4] 9.70% [1],[5],[6],[22]
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],[5],[6],[12],[31] $ 2,251  
Fair value at ending balance $ 2,256 [2],[3],[4],[8] $ 2,251 [1],[5],[6],[12],[31]
Interest 4.75% [2],[3],[4],[8] 4.75% [1],[5],[6],[12],[31]
Interest 10.00% [2],[3],[4],[8] 9.00% [1],[5],[6],[12],[31]
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],[5],[6],[12],[38] $ 2,753  
Fair value at ending balance $ 2,794 [2],[3],[8],[39] $ 2,753 [1],[5],[6],[12],[38]
Interest 4.75% [2],[3],[8],[39] 4.75% [1],[5],[6],[12],[38]
Interest 9.20% [2],[3],[8],[39] 7.70% [1],[5],[6],[12],[38]
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],[5],[6],[12],[24] $ 342  
Fair value at ending balance $ 349 [2],[3],[8],[25] $ 342 [1],[5],[6],[12],[24]
Interest 5.25% [2],[3],[8],[25] 5.75% [1],[5],[6],[12],[24]
Interest 9.10% [2],[3],[8],[25] 7.70% [1],[5],[6],[12],[24]
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],[5],[6],[12],[19] $ 577  
Fair value at ending balance $ 593 [2],[3],[4],[8] $ 577 [1],[5],[6],[12],[19]
Interest 5.25% [2],[3],[4],[8] 5.75% [1],[5],[6],[12],[19]
Interest 10.80% [2],[3],[4],[8] 10.50% [1],[5],[6],[12],[19]
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, Class A-2 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 41  
Fair value at ending balance $ 56 [3],[17] $ 41 [1],[6],[21]
Investment owned, balance (in shares) 28.8 [3],[9],[10],[17] 28.8 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 8,172  
Fair value at ending balance $ 9,595 [2],[3],[4] $ 8,172 [1],[5],[6],[19]
Interest 4.75% [2],[3],[4] 4.75% [1],[5],[6],[19]
Interest 10.10% [2],[3],[4] 9.40% [1],[5],[6],[19]
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],[5],[6],[12],[24] $ 829  
Fair value at ending balance $ 740 [2],[3],[8],[25],[29] $ 829 [1],[5],[6],[12],[24]
Interest 6.25% [2],[3],[8],[25],[29] 5.25% [1],[5],[6],[12],[24]
Interest 9.90% [2],[3],[8],[25],[29] 7.30% [1],[5],[6],[12],[24]
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],[5],[6],[12],[19] $ 842  
Fair value at ending balance $ 797 [2],[3],[8],[23] $ 842 [1],[5],[6],[12],[19]
Interest 6.25% [2],[3],[8],[23] 5.25% [1],[5],[6],[12],[19]
Interest 11.70% [2],[3],[8],[23] 10.00% [1],[5],[6],[12],[19]
Investment, Identifier [Axis]: Panoche Energy Center LLC, Electric, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] $ 4,628  
Fair value at ending balance $ 4,115 [3] $ 4,628 [1],[6]
Interest 6.90% [3] 6.90% [1],[6]
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],[5],[6],[12],[33] $ 2,638  
Fair value at ending balance $ 2,665 [2],[3],[8],[37] $ 2,638 [1],[5],[6],[12],[33]
Interest 6.50% [2],[3],[8],[37] 5.25% [1],[5],[6],[12],[33]
Interest 9.90% [2],[3],[8],[37] 7.10% [1],[5],[6],[12],[33]
Investment, interest rate, paid in kind [1],[5],[6],[12],[33]   0.75%
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],[5],[6],[12],[22] $ 1,455  
Fair value at ending balance $ 1,470 [2],[3],[4],[8] $ 1,455 [1],[5],[6],[12],[22]
Interest 6.50% [2],[3],[4],[8] 6.50% [1],[5],[6],[12],[22]
Interest 11.90% [2],[3],[4],[8] 9.60% [1],[5],[6],[12],[22]
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],[5],[6],[12],[24] $ 2,702  
Fair value at ending balance $ 2,351 [2],[3],[8],[25] $ 2,702 [1],[5],[6],[12],[24]
Interest 6.75% [2],[3],[8],[25] 6.75% [1],[5],[6],[12],[24]
Interest 10.50% [2],[3],[8],[25] 8.50% [1],[5],[6],[12],[24]
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],[5],[6],[12],[19] $ 3,159  
Fair value at ending balance $ 2,955 [2],[3],[4],[8] $ 3,159 [1],[5],[6],[12],[19]
Interest 6.75% [2],[3],[4],[8] 6.75% [1],[5],[6],[12],[19]
Interest 12.30% [2],[3],[4],[8] 11.40% [1],[5],[6],[12],[19]
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Credit Card ABS, Structured Secured Note - Class A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[12] $ 165  
Fair value at ending balance $ 166 [3],[8] $ 165 [1],[6],[12]
Interest 4.70% [3],[8] 4.70% [1],[6],[12]
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 [1],[6],[12] $ 162  
Fair value at ending balance $ 167 [3],[8] $ 162 [1],[6],[12]
Interest 5.40% [3],[8] 5.40% [1],[6],[12]
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 [1],[6],[12] $ 157  
Fair value at ending balance $ 163 [3],[8] $ 157 [1],[6],[12]
Interest 5.90% [3],[8] 5.90% [1],[6],[12]
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 [1],[6],[12] $ 158  
Fair value at ending balance $ 160 [3],[8] $ 158 [1],[6],[12]
Interest 8.50% [3],[8] 8.50% [1],[6],[12]
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 [1],[6],[12] $ 8,154  
Fair value at ending balance $ 8,288 [3],[8] $ 8,154 [1],[6],[12]
Interest 11.40% [3],[8] 11.40% [1],[6],[12]
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],[5],[6],[12],[50] $ 2,728  
Fair value at ending balance $ 2,585 [2],[3],[8],[41] $ 2,728 [1],[5],[6],[12],[50]
Interest 6.25% [2],[3],[8],[41] 6.00% [1],[5],[6],[12],[50]
Interest 10.40% [2],[3],[8],[41] 9.10% [1],[5],[6],[12],[50]
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],[5],[6],[19] $ 1,210  
Fair value at ending balance $ 1,207 [2],[3],[4] $ 1,210 [1],[5],[6],[19]
Interest 4.75% [2],[3],[4] 4.75% [1],[5],[6],[19]
Interest 10.30% [2],[3],[4] 9.60% [1],[5],[6],[19]
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 823  
Fair value at ending balance $ 1,203 [3],[17] $ 823 [1],[6],[21]
Investment owned, balance (in shares) 7,409 [3],[9],[10],[17] 7,408.6 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ (9)  
Fair value at ending balance $ (6) [2],[3],[4],[29] $ (9) [1],[5],[6],[19]
Interest 4.75% [2],[3],[4],[29] 4.75% [1],[5],[6],[19]
Interest 10.30% [2],[3],[4],[29] 9.60% [1],[5],[6],[19]
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 48,490  
Fair value at ending balance $ 49,900 [2],[3] $ 48,490 [1],[5],[6],[19]
Interest 6.00% [2],[3] 6.00% [1],[5],[6],[19]
Interest 11.60% [2],[3] 8.80% [1],[5],[6],[19]
Investment, interest rate, paid in kind 4.00% [2],[3] 4.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 438  
Fair value at ending balance $ 514 [3],[17] $ 438 [1],[6],[21]
Investment owned, balance (in shares) 2.55830 [3],[9],[10],[17] 2.55830 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 148  
Fair value at ending balance $ 173 [3],[17] $ 148 [1],[6],[21]
Investment owned, balance (in shares) 0.86340 [3],[9],[10],[17] 0.86340 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 0  
Fair value at ending balance $ 0 [3],[17] $ 0 [1],[6],[21]
Investment owned, balance (in shares) 0.08870 [3],[9],[10],[17] 0.08870 [1],[6],[13],[14],[21]
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 [1],[6],[21] $ 42  
Fair value at ending balance $ 50 [3],[17] $ 42 [1],[6],[21]
Investment owned, balance (in shares) 0.24710 [3],[9],[10],[17] 0.24710 [1],[6],[13],[14],[21]
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, Chemicals, Plastics & Rubber, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 0  
Investment owned, balance (in shares) [3],[17] 10,000  
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],[5],[6],[7],[16] $ 987  
Fair value at ending balance $ 929 [2],[3],[15],[23] $ 987 [1],[5],[6],[7],[16]
Interest 7.00% [2],[3],[15],[23] 7.00% [1],[5],[6],[7],[16]
Interest 12.30% [2],[3],[15],[23] 11.40% [1],[5],[6],[7],[16]
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],[5],[6],[19] $ 12,510  
Fair value at ending balance $ 12,509 [2],[3],[4] $ 12,510 [1],[5],[6],[19]
Interest 6.75% [2],[3],[4] 6.25% [1],[5],[6]
Interest 12.50% [2],[3],[4] 9.90% [1],[5],[6]
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],[5],[6],[12],[33] $ 5,656  
Fair value at ending balance $ 5,611 [2],[3],[8],[29],[37] $ 5,656 [1],[5],[6],[12],[33]
Interest 5.25% [2],[3],[8],[29],[37] 5.75% [1],[5],[6],[12],[33]
Interest 9.20% [2],[3],[8],[29],[37] 8.50% [1],[5],[6],[12],[33]
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],[5],[6],[12],[31] $ 2,719  
Fair value at ending balance $ 2,739 [2],[3],[8],[32] $ 2,719 [1],[5],[6],[12],[31]
Interest 5.25% [2],[3],[8],[32] 5.25% [1],[5],[6],[12],[31]
Interest 11.00% [2],[3],[8],[32] 8.60% [1],[5],[6],[12],[31]
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],[5],[6],[22] $ 4,907  
Fair value at ending balance $ 5,302 [2],[3],[4] $ 4,907 [1],[5],[6],[22]
Interest 5.25% [2],[3],[4] 5.75% [1],[5],[6],[22]
Interest 11.00% [2],[3],[4] 10.30% [1],[5],[6],[22]
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],[5],[6],[7] $ 304  
Fair value at ending balance [1],[5],[6],[7]   $ 304
Interest [1],[5],[6],[7]   6.00%
Interest [1],[5],[6],[7]   10.40%
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 281  
Investment owned, balance (in shares) [3],[17] 281  
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ 5,174  
Interest [2],[3],[4],[29] 6.25%  
Interest [2],[3],[4],[29] 11.60%  
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ (25)  
Interest [2],[3],[4],[29] 6.25%  
Interest [2],[3],[4],[29] 11.60%  
Investment, Identifier [Axis]: Professional Datasolutions, Inc. (PDI), Application Software, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 1,751  
Fair value at ending balance $ 1,775 [2],[3],[4] $ 1,751 [1],[5],[6],[19]
Interest 4.50% [2],[3],[4] 4.50% [1],[5],[6],[19]
Interest 10.00% [2],[3],[4] 8.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[31] $ 1,624  
Fair value at ending balance $ 1,621 [2],[3],[32] $ 1,624 [1],[5],[6],[31]
Interest 5.75% [2],[3],[32] 5.75% [1],[5],[6],[31]
Interest 11.50% [2],[3],[32] 9.60% [1],[5],[6],[31]
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 172  
Fair value at ending balance $ 182 [3],[17] $ 172 [1],[6],[21]
Investment owned, balance (in shares) 241,935.48 [3],[9],[10],[17] 241,935.48 [1],[6],[13],[14],[21]
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[31] $ (7)  
Fair value at ending balance $ 188 [2],[3],[29],[32] $ (7) [1],[5],[6],[31]
Interest 5.75% [2],[3],[29],[32] 5.75% [1],[5],[6],[31]
Interest 11.50% [2],[3],[29],[32] 9.60% [1],[5],[6],[31]
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 [1],[6] $ 74  
Fair value at ending balance $ 72 [3] $ 74 [1],[6]
Interest 8.00% [3] 8.00% [1],[6]
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 [1],[6],[16],[21] $ 0  
Fair value at ending balance $ 0 [3],[15],[17] $ 0 [1],[6],[16],[21]
Investment owned, balance (in shares) 1,668,106 [3],[9],[10],[15],[17] 1,668,106 [1],[6],[13],[14],[16],[21]
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],[5],[6],[12],[33] $ 1,365  
Fair value at ending balance $ 1,531 [2],[3],[8],[29],[37] $ 1,365 [1],[5],[6],[12],[33]
Interest 6.75% [2],[3],[8],[29],[37] 6.00% [1],[5],[6],[12],[33]
Interest 10.80% [2],[3],[8],[29],[37] 7.70% [1],[5],[6],[12],[33]
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],[5],[6],[12],[33] $ 2,017  
Fair value at ending balance $ 1,987 [2],[3],[8],[37] $ 2,017 [1],[5],[6],[12],[33]
Interest 6.50% [2],[3],[8],[37] 5.25% [1],[5],[6],[12],[33]
Interest 10.50% [2],[3],[8],[37] 7.10% [1],[5],[6],[12],[33]
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],[5],[6],[12],[26] $ 1,821  
Fair value at ending balance $ 1,736 [2],[3],[8],[27] $ 1,821 [1],[5],[6],[12],[26]
Interest 4.50% [2],[3],[8],[27] 5.50% [1],[5],[6],[12],[26]
Interest 8.60% [2],[3],[8],[27] 8.60% [1],[5],[6],[12],[26]
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 [3],[17] $ 49  
Investment owned, balance (in shares) [3],[9],[10],[17] 303,030  
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 588  
Interest [2],[3],[4] 5.75%  
Interest [2],[3],[4] 11.20%  
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 156  
Investment owned, balance (in shares) [3],[9],[10],[17] 148  
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ (6)  
Interest [2],[3],[4],[29] 5.75%  
Interest [2],[3],[4],[29] 11.20%  
Investment, Identifier [Axis]: Questel Unite, Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[19] $ 6,692  
Fair value at ending balance $ 6,768 [2],[3],[4],[8] $ 6,692 [1],[5],[6],[12],[19]
Interest 6.25% [2],[3],[4],[8] 6.25% [1],[5],[6],[12],[19]
Interest 11.80% [2],[3],[4],[8] 11.00% [1],[5],[6],[12],[19]
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] $ 9,873  
Fair value at ending balance $ 5,988 [2],[3],[29],[32] $ 9,873 [1],[5],[6],[22]
Interest 6.25% [2],[3],[29],[32] 6.25% [1],[5],[6],[22]
Interest 11.10% [2],[3],[29],[32] 10.80% [1],[5],[6],[22]
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],[5],[6],[22] $ 403  
Fair value at ending balance $ 110 [2],[3],[29],[32] $ 403 [1],[5],[6],[22]
Interest 6.25% [2],[3],[29],[32] 6.25% [1],[5],[6],[22]
Interest 11.10% [2],[3],[29],[32] 10.80% [1],[5],[6],[22]
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],[5],[6],[16],[19] $ 12,658  
Fair value at ending balance $ 12,723 [2],[3],[4],[15] $ 12,658 [1],[5],[6],[16],[19]
Interest 6.75% [2],[3],[4],[15] 6.75% [1],[5],[6],[16],[19]
Interest 12.00% [2],[3],[4],[15] 11.40% [1],[5],[6],[16],[19]
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[16],[19] $ (25)  
Fair value at ending balance $ 469 [2],[3],[4],[15],[29] $ (25) [1],[5],[6],[16],[19]
Interest 6.75% [2],[3],[4],[15],[29] 6.75% [1],[5],[6],[16],[19]
Interest 12.00% [2],[3],[4],[15],[29] 11.40% [1],[5],[6],[16],[19]
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[36] $ 9,438  
Fair value at ending balance $ 9,323 [2],[3],[25] $ 9,438 [1],[5],[6],[36]
Interest 4.75% [2],[3],[25] 4.75% [1],[5],[36]
Interest 8.70% [2],[3],[25] 6.60% [1],[5],[36]
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],[5],[6],[19] $ 1,274  
Fair value at ending balance $ 1,987 [2],[3],[32] $ 1,274 [1],[5],[6],[19]
Interest 4.75% [2],[3],[32] 4.75% [1],[5],[6],[19]
Interest 10.50% [2],[3],[32] 9.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: RPX Corporation, Research & Consulting Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 7,144  
Fair value at ending balance $ 6,708 [2],[3],[4] $ 7,144 [1],[5],[6],[19]
Interest 5.50% [2],[3],[4] 5.50% [1],[5],[6],[19]
Interest 10.80% [2],[3],[4] 9.90% [1],[5],[6],[19]
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Class A Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[16] $ 1  
Fair value at ending balance $ 0 [3],[15],[17] $ 1 [1],[6],[16]
Investment owned, balance (in shares) 145.347 [3],[9],[10],[15],[17] 145.347 [1],[6],[13],[14],[16]
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 [1],[6],[16],[21] $ 0  
Fair value at ending balance $ 0 [3],[15],[17] $ 0 [1],[6],[16],[21]
Investment owned, balance (in shares) 145.347 [3],[9],[10],[15],[17] 145.347 [1],[6],[13],[14],[16],[21]
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 [1],[6],[16],[21] $ 155  
Fair value at ending balance $ 38 [3],[15],[17] $ 155 [1],[6],[16],[21]
Investment owned, balance (in shares) 7,844.03 [3],[9],[10],[15],[17] 7,844.03 [1],[6],[13],[14],[16],[21]
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 [1],[6],[16],[21] $ 0  
Fair value at ending balance $ 0 [3],[15],[17] $ 0 [1],[6],[16],[21]
Investment owned, balance (in shares) 153 [3],[9],[10],[15],[17] 153 [1],[6],[13],[14],[16],[21]
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],[5],[6],[16],[28] $ 9,761  
Fair value at ending balance $ 8,695 [2],[3],[4],[15] $ 9,761 [1],[5],[6],[16],[28]
Interest 7.75% [2],[3],[4],[15] 7.75% [1],[5],[6],[16],[28]
Interest 13.00% [2],[3],[4],[15] 12.00% [1],[5],[6],[16],[28]
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],[5],[6],[16],[28] $ 1,480  
Fair value at ending balance $ 1,925 [2],[3],[4],[15] $ 1,480 [1],[5],[6],[16],[28]
Interest 7.75% [2],[3],[4],[15] 7.75% [1],[5],[6],[16],[28]
Interest 13.00% [2],[3],[4],[15] 12.00% [1],[5],[6],[16],[28]
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],[5],[6],[22] $ 12,708  
Fair value at ending balance $ 12,772 [2],[3],[4] $ 12,708 [1],[5],[6],[22]
Interest 6.50% [2],[3],[4] 6.50% [1],[5],[6],[22]
Interest 11.80% [2],[3],[4] 10.60% [1],[5],[6],[22]
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 [1],[6],[21] $ 533  
Fair value at ending balance $ 566 [3],[17] $ 533 [1],[6],[21]
Investment owned, balance (in shares) 5,333 [3],[9],[10],[17] 5,333 [1],[6],[13],[14],[21]
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],[5],[6],[22] $ 238  
Fair value at ending balance $ 500 [2],[3],[4] $ 238 [1],[5],[6],[22]
Interest 6.50% [2],[3],[4] 6.50% [1],[5],[6],[22]
Interest 11.80% [2],[3],[4] 10.60% [1],[5],[6],[22]
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],[5],[6],[19] $ 11,392  
Fair value at ending balance $ 11,442 [2],[3],[4] $ 11,392 [1],[5],[6],[19]
Interest 6.00% [2],[3],[4] 6.50% [1],[5],[6],[19]
Interest 11.40% [2],[3],[4] 10.30% [1],[5],[6],[19]
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 125  
Fair value at ending balance $ 125 [3],[17] $ 125 [1],[6],[21]
Investment owned, balance (in shares) 187,235 [3],[9],[10],[17] 187,235 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 4,556  
Fair value at ending balance $ 4,173 [2],[3],[4] $ 4,556 [1],[5],[6],[19]
Interest 5.50% [2],[3],[4] 5.50% [1],[5],[6],[19]
Interest 11.00% [2],[3],[4] 10.10% [1],[5],[6],[19]
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 152  
Fair value at ending balance $ 65 [3],[17] $ 152 [1],[6],[21]
Investment owned, balance (in shares) 197,368.42 [3],[9],[10],[17] 197,368.42 [1],[6],[13],[14],[21]
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],[5],[6],[16],[19] $ 4,243  
Fair value at ending balance $ 2,032 [2],[3],[4],[15] $ 4,243 [1],[5],[6],[16],[19]
Interest 8.00% [2],[3],[4],[15] 8.00% [1],[5],[6],[16],[19]
Interest 13.60% [2],[3],[4],[15] 12.40% [1],[5],[6],[16],[19]
Investment, Identifier [Axis]: Resonetics, LLC, Health Care Equipment, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 3,926  
Fair value at ending balance $ 3,886 [2],[3],[4] $ 3,926 [1],[5],[6],[19]
Interest 7.00% [2],[3],[4] 7.00% [1],[5],[6],[19]
Interest 12.70% [2],[3],[4] 11.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: Reward Gateway (UK) Ltd, Precious Metals & Minerals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[38] $ 2,840  
Fair value at ending balance [1],[5],[6],[12],[38]   $ 2,840
Interest [1],[5],[6],[12],[38]   6.25%
Interest [1],[5],[6],[12],[38]   8.40%
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Finance Companies, Structured - Junior Note    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8],[29] 20,129  
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],[5],[6],[12],[24] 2,162  
Fair value at ending balance $ 2,035 [2],[3],[8],[25] $ 2,162 [1],[5],[6],[12],[24]
Interest 6.25% [2],[3],[8],[25] 6.25% [1],[5],[6],[12],[24]
Interest 10.20% [2],[3],[8],[25] 8.50% [1],[5],[6],[12],[24]
Investment, Identifier [Axis]: Rocade Holdings LLC, Common LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 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 504  
Fair value at ending balance 504 $ 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, Common LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[11],[17] $ 504  
Investment owned, balance (in shares) [3],[9],[10],[11],[17] 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 [3],[4],[11] $ 58,850  
Interest [3],[4],[11] 6.00%  
Investment, interest rate, paid in kind [3],[4] 11.40%  
Investment owned, balance (in shares) [3],[4],[9],[10],[11] 55,000  
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 58,841  
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 9  
Fair value at ending balance 58,850 0
Amount of Interest or Dividends Credited to Income $ 3,841  
Interest 6.00%  
Investment, interest rate, paid in kind 11.40%  
Investment owned, balance (in shares) 55,000  
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production,    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Investment owned, balance (in shares) [3],[9],[10],[17] 233,871  
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[9],[10],[17] $ 1,251  
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23] $ 6,422  
Interest [2],[3],[23] 7.75%  
Interest [2],[3],[23] 13.10%  
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23],[29] $ (33)  
Interest [2],[3],[23],[29] 7.75%  
Interest [2],[3],[23],[29] 13.10%  
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],[5],[6],[22] $ 10,808  
Fair value at ending balance $ 6,737 [2],[3],[4],[29] $ 10,808 [1],[5],[6],[22]
Interest 5.50% [2],[3],[4],[29] 6.00% [1],[5],[6],[22]
Interest 10.90% [2],[3],[4],[29] 10.40% [1],[5],[6],[22]
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],[5],[6],[22] $ 377  
Fair value at ending balance $ 387 [2],[3],[4],[29] $ 377 [1],[5],[6],[22]
Interest 5.50% [2],[3],[4],[29] 6.00% [1],[5],[6],[22]
Interest 10.90% [2],[3],[4],[29] 10.40% [1],[5],[6],[22]
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],[5],[6],[19] $ 9,238  
Fair value at ending balance $ 9,111 [2],[3],[4] $ 9,238 [1],[5],[6],[19]
Interest 3.00% [2],[3],[4] 6.00% [1],[5],[6],[19]
Interest 8.40% [2],[3],[4] 10.70% [1],[5],[6],[19]
Investment, interest rate, paid in kind [4] 4.00%  
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ 12,682  
Interest [2],[3],[4],[29] 6.75%  
Interest [2],[3],[4],[29] 12.10%  
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ (30)  
Interest [2],[3],[4],[29] 6.75%  
Interest [2],[3],[4],[29] 12.10%  
Investment, Identifier [Axis]: SISU ACQUISITIONCO., INC., Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 6,376  
Fair value at ending balance $ 6,837 [2],[3],[23] $ 6,376 [1],[5],[6],[19]
Interest 5.25% [2],[3],[23] 5.50% [1],[5],[6],[19]
Interest 10.60% [2],[3],[23] 10.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: SMART Financial Operations, LLC, Banking, Finance, Insurance & Real Estate, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[16],[21] $ 110  
Fair value at ending balance $ 1,400 [3],[15],[17] $ 110 [1],[6],[16],[21]
Investment owned, balance (in shares) 1,000,000 [3],[9],[10],[15],[17] 1,000,000 [1],[6],[13],[14],[16],[21]
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],[5],[6],[19] $ 10,951  
Fair value at ending balance $ 10,996 [2],[3],[4] $ 10,951 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.20% [2],[3],[4] 10.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] $ 22,041  
Fair value at ending balance [1],[5],[6],[22]   $ 22,041
Interest [1],[5],[6],[22]   6.25%
Interest [1],[5],[6],[22]   10.40%
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] 516  
Fair value at ending balance [1],[6],[21]   $ 516
Investment owned, balance (in shares) [1],[6],[13],[14],[21]   516,399
Investment, Identifier [Axis]: SOLO Buyer, L.P., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] (50)  
Fair value at ending balance [1],[5],[6],[22]   $ (50)
Interest [1],[5],[6],[22]   6.25%
Interest [1],[5],[6],[22]   10.40%
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[34] 2,383  
Fair value at ending balance $ 3,261 [2],[3],[8],[29],[35] $ 2,383 [1],[5],[6],[12],[34]
Interest 6.00% [2],[3],[8],[29],[35] 6.50% [1],[5],[6],[12],[34]
Interest 11.30% [2],[3],[8],[29],[35] 9.40% [1],[5],[6],[12],[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],[5],[6],[19] $ 11,792  
Fair value at ending balance $ 11,443 [2],[3],[4] $ 11,792 [1],[5],[6],[19]
Interest 6.00% [2],[3],[4] 6.00% [1],[5],[6],[19]
Interest 11.60% [2],[3],[4] 11.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 460  
Fair value at ending balance $ 445 [3],[17] $ 460 [1],[6],[21]
Investment owned, balance (in shares) 378.7 [3],[9],[10],[17] 372.1 [1],[6],[13],[14],[21]
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],[5],[6],[12],[33] $ 1,939  
Fair value at ending balance $ 2,298 [2],[3],[8],[25] $ 1,939 [1],[5],[6],[12],[33]
Interest 5.25% [2],[3],[8],[25] 5.50% [1],[5],[6],[12],[33]
Interest 8.80% [2],[3],[8],[25] 8.20% [1],[5],[6],[12],[33]
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],[5],[6],[12],[61] $ 3,886  
Fair value at ending balance $ 3,099 [2],[3],[8],[55] $ 3,886 [1],[5],[6],[12],[61]
Interest 5.25% [2],[3],[8],[55] 5.50% [1],[5],[6],[12],[61]
Interest 7.00% [2],[3],[8],[55] 5.90% [1],[5],[6],[12],[61]
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],[5],[6],[22] $ 1,716  
Fair value at ending balance $ 1,764 [2],[3],[4],[29] $ 1,716 [1],[5],[6],[22]
Interest 5.50% [2],[3],[4],[29] 5.50% [1],[5],[6],[22]
Interest 11.00% [2],[3],[4],[29] 10.20% [1],[5],[6],[22]
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],[5],[6],[22] $ (3)  
Fair value at ending balance $ (7) [2],[3],[4],[29] $ (3) [1],[5],[6],[22]
Interest 5.50% [2],[3],[4],[29] 5.50% [1],[5],[6],[22]
Interest 11.00% [2],[3],[4],[29] 10.20% [1],[5],[6],[22]
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],[5],[6],[12],[24] $ 6,310  
Fair value at ending balance [1],[5],[6],[12],[24]   $ 6,310
Interest [1],[5],[6],[12]   6.00%
Interest [1],[5],[6],[12]   8.00%
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[25] $ 3,271  
Interest [2],[3],[8],[25] 5.50%  
Interest [2],[3],[8],[25] 9.30%  
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[8] $ 428  
Interest [2],[3],[4],[8] 6.00%  
Interest [2],[3],[4],[8] 11.30%  
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],[5],[6],[12],[24] $ (21)  
Fair value at ending balance $ (34) [2],[3],[8],[25],[29] $ (21) [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25],[29] 6.00% [1],[5],[6],[12]
Interest 9.30% [2],[3],[8],[25],[29] 8.00% [1],[5],[6],[12]
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, 2023 Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 0  
Gross Additions 3,293  
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 (117)  
Fair value at ending balance 3,176 $ 0
Amount of Interest or Dividends Credited to Income $ 71  
Interest 6.00%  
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan, Controlled    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 6,020 0
Gross Additions 152 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 6,172 6,020
Amount of Interest or Dividends Credited to Income $ 230 $ 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 (202) 15
Fair value at ending balance 373 575
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 (18,938) 14,975
Fair value at ending balance 34,790 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 313 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 10,847 10,534
Amount of Interest or Dividends Credited to Income $ 283 $ 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 153 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 (26) 183
Fair value at ending balance 2,142 2,015
Amount of Interest or Dividends Credited to Income $ 266 $ 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 [1],[6],[12],[49] $ 6,020  
Fair value at ending balance $ 6,172 [3],[8],[44],[57] $ 6,020 [1],[6],[12],[49]
Investment, interest rate, paid in kind 5.00% [3],[8],[44],[57] 5.00% [1],[6],[12],[49]
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 [1],[6],[12],[21],[49] $ 575  
Fair value at ending balance $ 373 [3],[8],[17],[44],[57] $ 575 [1],[6],[12],[21],[49]
Investment owned, balance (in shares) 17,100 [3],[8],[9],[10],[17],[44],[57] 17,100 [1],[6],[12],[13],[14],[21],[49]
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 [1],[6],[12],[21],[49] $ 53,728  
Fair value at ending balance $ 34,790 [3],[8],[17],[44],[57] $ 53,728 [1],[6],[12],[21],[49]
Investment owned, balance (in shares) 1,236 [3],[8],[9],[10],[17],[44],[57] 1,236 [1],[6],[12],[13],[14],[21],[49]
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8],[29],[44],[57] $ 3,176  
Investment, interest rate, paid in kind [3],[8],[29],[44],[57] 6.00%  
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[12],[49] $ 10,534  
Fair value at ending balance $ 10,847 [3],[8],[44],[57] $ 10,534 [1],[6],[12],[49]
Investment, interest rate, paid in kind 3.10% [3],[8],[44],[57] 3.10% [1],[6],[12],[49]
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 [1],[6],[12],[49] $ 2,015  
Fair value at ending balance [1],[6],[12],[49]   $ 2,015
Interest [1],[6],[12],[49]   6.00%
Investment, interest rate, paid in kind [1],[6],[12],[49]   9.00%
Investment, Identifier [Axis]: Security Holdings B.V.,Senior Unsecured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[8],[29],[44],[57] $ 2,142  
Interest [3],[8],[29],[44],[57] 6.00%  
Investment, interest rate, paid in kind [3],[8],[29],[44],[57] 9.00%  
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[33] $ 348  
Fair value at ending balance $ 474 [2],[3],[8],[37] $ 348 [1],[5],[6],[12],[33]
Interest 6.25% [2],[3],[8],[37] 5.75% [1],[5],[6],[12],[33]
Interest 10.00% [2],[3],[8],[37] 8.20% [1],[5],[6],[12],[33]
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],[5],[6],[12],[33] $ 479  
Fair value at ending balance $ 452 [2],[3],[8],[37] $ 479 [1],[5],[6],[12],[33]
Interest 6.25% [2],[3],[8],[37] 5.75% [1],[5],[6],[12],[33]
Interest 10.30% [2],[3],[8],[37] 8.20% [1],[5],[6],[12],[33]
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[29],[37] $ 849  
Interest [2],[3],[8],[29],[37] 6.25%  
Interest [2],[3],[8],[29],[37] 10.60%  
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 1,519  
Investment owned, balance (in shares) [3],[9],[10],[17] 109,127  
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[4] $ 34  
Interest [2],[4] 7.50%  
Interest [2],[4] 12.90%  
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],[5],[19] $ 7,148  
Fair value at ending balance [1],[5],[19]   $ 7,148
Interest [1],[5],[19]   7.50%
Interest [1],[5],[19]   12.30%
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Super Priority Second Out    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[19] 1,625  
Fair value at ending balance [1],[5],[19]   $ 1,625
Interest [1],[5],[19]   7.50%
Interest [1],[5],[19]   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 [1],[6],[12],[21] 1,200  
Fair value at ending balance [1],[6],[12],[21]   $ 1,200
Investment owned, balance (in shares) [1],[6],[12],[13],[14],[21]   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],[5],[6],[12],[22] 33,720  
Fair value at ending balance [1],[5],[6],[12],[22]   $ 33,720
Interest [1],[5],[6],[12],[22]   6.00%
Interest [1],[5],[6],[12],[22]   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 [3],[8],[17] $ 1,140  
Investment owned, balance (in shares) [3],[8],[9],[10],[17] 1,200,000  
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[8] $ 33,836  
Interest [2],[3],[4],[8] 6.00%  
Interest [2],[3],[4],[8] 11.70%  
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Joint Venture, 89.01% Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[12],[16] $ 37,950  
Fair value at ending balance [1],[12],[16]   $ 37,950
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Joint Venture, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[11],[15] 42,088  
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 4,138 (12,271)
Fair value at ending balance 42,088 37,950
Amount of Interest or Dividends Credited to Income 3,873 4,526
Investment, Identifier [Axis]: Sinari Invest, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[29],[37] $ 1,663  
Interest [2],[3],[8],[29],[37] 6.00%  
Interest [2],[3],[8],[29],[37] 9.90%  
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 275  
Investment owned, balance (in shares) [3],[9],[10],[17] 275  
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ 9,306  
Interest [2],[3],[4],[29] 6.25%  
Interest [2],[3],[4],[29] 11.70%  
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ (41)  
Interest [2],[3],[4],[29] 6.25%  
Interest [2],[3],[4],[29] 11.70%  
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],[5],[6],[7] $ 13,393  
Fair value at ending balance $ 15,458 [2],[3],[23] $ 13,393 [1],[5],[6],[7]
Interest 5.75% [2],[3],[23] 5.75% [1],[5],[6],[7]
Interest 11.20% [2],[3],[23] 10.10% [1],[5],[6],[7]
Investment, Identifier [Axis]: Smartling, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] $ (24)  
Fair value at ending balance $ (9) [2],[3],[23],[29] $ (24) [1],[5],[6],[7]
Interest 5.75% [2],[3],[23],[29] 5.75% [1],[5],[6],[7]
Interest 11.20% [2],[3],[23],[29] 10.10% [1],[5],[6],[7]
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],[5],[6],[31] $ 4,196  
Fair value at ending balance $ 4,138 [2],[3],[4] $ 4,196 [1],[5],[6],[31]
Interest 4.50% [2],[3],[4] 4.50% [1],[5],[6],[31]
Interest 10.00% [2],[3],[4] 7.90% [1],[5],[6],[31]
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],[5],[6],[31] $ 565  
Fair value at ending balance $ 560 [2],[3],[4] $ 565 [1],[5],[6],[31]
Interest 4.50% [2],[3],[4] 4.50% [1],[5],[6],[31]
Interest 10.00% [2],[3],[4] 7.90% [1],[5],[6],[31]
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 [1],[6],[12] $ 5,616  
Fair value at ending balance $ 4,297 [3],[8],[29] $ 5,616 [1],[6],[12]
Investment, interest rate, paid in kind 9.50% [3],[8],[29] 9.50% [1],[6],[12]
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 15,094  
Interest [2],[3],[4] 6.25%  
Interest [2],[3],[4] 11.70%  
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 380  
Investment owned, balance (in shares) [3],[9],[10],[17] 516,399  
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 343  
Interest [2],[3],[4] 6.25%  
Interest [2],[3],[4] 11.70%  
Investment, Identifier [Axis]: Sound Point CLO XX, Ltd., Multi-Sector Holdings, Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[12],[16] $ 1,192  
Fair value at ending balance 871 [8],[15] $ 1,192 [1],[12],[16]
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],[5],[6],[22] 1,621  
Fair value at ending balance $ 1,890 [2],[3],[4],[29] $ 1,621 [1],[5],[6],[22]
Interest 5.00% [2],[3],[4],[29] 5.00% [1],[5],[6],[22]
Interest 10.40% [2],[3],[4],[29] 9.60% [1],[5],[6],[22]
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],[5],[6],[22] $ (4)  
Fair value at ending balance $ 56 [2],[3],[4],[29] $ (4) [1],[5],[6],[22]
Interest 5.00% [2],[3],[4],[29] 5.00% [1],[5],[6],[22]
Interest 10.30% [2],[3],[4],[29] 9.60% [1],[5],[6],[22]
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],[5],[6],[28] $ 5,754  
Fair value at ending balance $ 11,461 [2],[3],[23],[29] $ 5,754 [1],[5],[6],[28]
Interest 5.00% [2],[3],[23],[29] 5.50% [1],[5],[6],[28]
Interest 10.30% [2],[3],[23],[29] 9.70% [1],[5],[6],[28]
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],[5],[6],[28] $ (35)  
Fair value at ending balance $ (24) [2],[3],[23],[29] $ (35) [1],[5],[6],[28]
Interest 5.00% [2],[3],[23],[29] 5.50% [1],[5],[6],[28]
Interest 10.30% [2],[3],[23],[29] 9.70% [1],[5],[6],[28]
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],[5],[6],[7] $ 20,510  
Fair value at ending balance $ 13,727 [2],[3],[4] $ 20,510 [1],[5],[6],[7]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[7]
Interest 11.10% [2],[3],[4] 10.10% [1],[5],[6],[7]
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],[5],[6],[22] $ 2,763  
Fair value at ending balance $ 2,805 [2],[3],[4] $ 2,763 [1],[5],[6],[22]
Interest 6.50% [2],[3],[4] 6.50% [1],[5],[6],[22]
Interest 11.90% [2],[3],[4] 11.10% [1],[5],[6],[22]
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],[5],[6],[12],[19] $ 2,477  
Fair value at ending balance $ 2,487 [2],[3],[8],[32] $ 2,477 [1],[5],[6],[12],[19]
Interest 6.00% [2],[3],[8],[32] 6.30% [1],[5],[6],[12],[19]
Interest 11.30% [2],[3],[8],[32] 10.70% [1],[5],[6],[12],[19]
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 12,860  
Fair value at ending balance $ 12,836 [2],[3],[4] $ 12,860 [1],[5],[6],[19]
Interest 5.50% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.20% [2],[3],[4] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ (26)  
Fair value at ending balance $ 441 [2],[3],[4],[29] $ (26) [1],[5],[6],[19]
Interest 5.50% [2],[3],[4],[29] 5.75% [1],[5],[6],[19]
Interest 11.20% [2],[3],[4],[29] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Syniverse Holdings, Inc., Technology Distributors, Series A Preferred Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] $ 6,515  
Fair value at ending balance $ 8,518 [3] $ 6,515 [1],[6]
Investment, interest rate, paid in kind 12.50% [3] 12.50% [1],[6]
Investment owned, balance (in shares) 7,575,758 [3],[9],[10] 7,575,758 [1],[6],[13],[14]
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],[5],[6],[7],[12] $ 1,812  
Fair value at ending balance $ 1,896 [2],[3],[8],[23] $ 1,812 [1],[5],[6],[7],[12]
Interest 5.75% [2],[3],[8],[23] 5.75% [1],[5],[6],[7],[12]
Interest 11.20% [2],[3],[8],[23] 10.10% [1],[5],[6],[7],[12]
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],[5],[6],[7],[12] $ 622  
Fair value at ending balance $ 647 [2],[3],[8],[23] $ 622 [1],[5],[6],[7],[12]
Interest 5.75% [2],[3],[8],[23] 5.75% [1],[5],[6],[7],[12]
Interest 11.20% [2],[3],[8],[23] 10.10% [1],[5],[6],[7],[12]
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 [1],[6],[21] $ 60  
Fair value at ending balance $ 69 [3],[17] $ 60 [1],[6],[21]
Investment owned, balance (in shares) 1,589 [3],[9],[10],[17] 1,589 [1],[6],[13],[14],[21]
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 [1],[6] $ 2,110  
Fair value at ending balance $ 2,385 [3] $ 2,110 [1],[6]
Investment, interest rate, paid in kind 7.80% [3] 7.80% [1],[6]
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],[5],[6],[12],[34] $ 1,557  
Fair value at ending balance [1],[5],[6],[12],[34]   $ 1,557
Interest [1],[5],[6],[12],[34]   6.25%
Interest [1],[5],[6],[12],[34]   8.40%
Investment, Identifier [Axis]: TSM II Luxco 10 SARL, Chemical & Plastics, Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12] 11,118  
Fair value at ending balance [1],[5],[6],[12]   $ 11,118
Investment, interest rate, paid in kind [1],[5],[6],[12]   9.30%
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] 591  
Fair value at ending balance $ 600 [2],[3],[4] $ 591 [1],[5],[6],[22]
Interest 4.75% [2],[3],[4] 4.75% [1],[5],[22]
Interest 10.90% [2],[3],[4] 9.20% [1],[5],[22]
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 [1],[6],[21] $ 5  
Fair value at ending balance $ 5 [3],[17] $ 5 [1],[6],[21]
Investment owned, balance (in shares) 4,673 [9],[10],[17] 4,673 [1],[6],[13],[14],[21]
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],[5],[6],[22] $ (4)  
Fair value at ending balance $ (3) [2],[3],[4],[29] $ (4) [1],[5],[6],[22]
Interest 4.75% [2],[3],[4],[29] 4.75% [1],[5],[22]
Interest 10.90% [2],[3],[4],[29] 9.20% [1],[5],[22]
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],[5],[6],[28] $ 10,877  
Fair value at ending balance [1],[5],[6],[28]   $ 10,877
Interest [1],[5],[6],[28]   5.75%
Interest [1],[5],[6],[28]   10.20%
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23] $ 7,811  
Interest [2],[3],[23] 5.75%  
Interest [2],[3],[23] 11.20%  
Investment, Identifier [Axis]: Tank Holding Corp, Metal & Glass Containers, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23],[29] $ 2,102  
Interest [2],[3],[23],[29] 6.00%  
Interest [2],[3],[23],[29] 11.40%  
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],[5],[6],[28] $ 157  
Fair value at ending balance $ 663 [2],[3],[23],[29] $ 157 [1],[5],[6],[28]
Interest 5.75% [2],[3],[23],[29] 5.75% [1],[5],[6],[28]
Interest 11.20% [2],[3],[23],[29] 10.20% [1],[5],[6],[28]
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Technology. First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[8],[35] $ 1,603  
Interest [2],[3],[8],[35] 6.25%  
Interest [2],[3],[8],[35] 11.20%  
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 401  
Investment owned, balance (in shares) [3],[9],[10],[17] 400,000  
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3] $ 589  
Interest 12.00%  
Investment, Identifier [Axis]: Team Car Care, LLC, Automotive, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[16],[19] $ 11,970  
Fair value at ending balance $ 10,565 [2],[3],[4],[15] $ 11,970 [1],[5],[6],[16],[19]
Interest 7.50% [2],[3],[4],[15] 8.00% [1],[5],[6],[16],[19]
Interest 13.00% [2],[3],[4],[15] 11.80% [1],[5],[6],[16],[19]
Investment, Identifier [Axis]: Team Services Group, Services: Consumer, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[16],[31] $ 9,345  
Fair value at ending balance $ 9,543 [2],[15],[32] $ 9,345 [1],[5],[6],[16],[31]
Interest 5.00% [2],[15],[32] 5.00% [1],[5],[6],[16],[31]
Interest 10.90% [2],[15],[32] 9.90% [1],[5],[6],[16],[31]
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],[5],[6],[16],[31] $ 4,700  
Fair value at ending balance $ 4,500 [2],[3],[15],[32] $ 4,700 [1],[5],[6],[16],[31]
Interest 9.00% [2],[3],[15],[32] 9.00% [1],[5],[6],[16],[31]
Interest 14.90% [2],[3],[15],[32] 13.90% [1],[5],[6],[16],[31]
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],[5],[6],[12],[24] $ 3,578  
Fair value at ending balance $ 3,647 [2],[3],[8],[25] $ 3,578 [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25] 5.50% [1],[5],[6],[12],[24]
Interest 9.40% [2],[3],[8],[25] 7.90% [1],[5],[6],[12],[24]
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],[5],[6],[12],[24] $ 281  
Fair value at ending balance $ 191 [2],[3],[8],[25] $ 281 [1],[5],[6],[12],[24]
Interest 5.50% [2],[3],[8],[25] 5.50% [1],[5],[6],[12],[24]
Interest 9.40% [2],[3],[8],[25] 7.90% [1],[5],[6],[12],[24]
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 6,220  
Interest [2],[3],[4] 5.50%  
Interest [2],[3],[4] 10.70%  
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],[5],[6],[19] $ 871  
Fair value at ending balance [1],[5],[6],[19]   $ 871
Interest [1],[5],[6],[19]   5.00%
Interest [1],[5],[6],[19]   9.70%
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 5,368  
Fair value at ending balance [1],[5],[6],[19]   $ 5,368
Interest [1],[5],[6],[19]   5.00%
Interest [1],[5],[6],[19]   9.70%
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] (13)  
Fair value at ending balance $ (8) [2],[3],[4],[29] $ (13) [1],[5],[6],[19]
Interest 5.50% [2],[3],[4],[29] 5.00% [1],[5],[6],[19]
Interest 10.70% [2],[3],[4],[29] 9.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: Terrybear, Inc., Consumer Products, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 255  
Fair value at ending balance $ 141 [3],[17] $ 255 [1],[6],[21]
Investment owned, balance (in shares) 24,358.97 [3],[9],[10],[17] 24,358.97 [1],[6],[13],[14],[21]
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 [1],[6] $ 259  
Fair value at ending balance $ 264 [3] $ 259 [1],[6]
Interest 10.00% [3] 10.00% [1],[6]
Investment, interest rate, paid in kind 4.00% [3] 4.00% [1],[6]
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],[5],[6],[19] $ 798  
Fair value at ending balance $ 832 [2],[3],[4],[29] $ 798 [1],[5],[6],[19]
Interest 4.25% [2],[3],[4],[29] 4.25% [1],[5],[6],[19]
Interest 9.80% [2],[3],[4],[29] 9.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ (9)  
Fair value at ending balance $ 0 [2],[3],[4],[29] $ (9) [1],[5],[6],[19]
Interest 4.25% [2],[3],[4],[29] 4.25% [1],[5],[6],[19]
Interest 9.80% [2],[3],[4],[29] 9.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[31] $ 3,380  
Fair value at ending balance $ 3,452 [2],[3],[32] $ 3,380 [1],[5],[6],[31]
Interest 7.75% [2],[3],[32] 7.75% [1],[5],[6],[31]
Interest 12.90% [2],[3],[32] 12.70% [1],[5],[6],[31]
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23] $ 16,613  
Interest [2],[3],[23] 5.75%  
Interest [2],[3],[23] 11.20%  
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23],[29] $ (13)  
Interest [2],[3],[23],[29] 5.75%  
Interest [2],[3],[23],[29] 11.20%  
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3] $ 4,724  
Investment, interest rate, paid in kind [3] 12.50%  
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[28] $ 25,979  
Fair value at ending balance [1],[5],[6],[28]   $ 25,979
Interest [1],[5],[6],[28]   5.75%
Interest [1],[5],[6],[28]   10.10%
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Industrial Equipment, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6] 5,547  
Fair value at ending balance [1],[6]   $ 5,547
Investment, interest rate, paid in kind [1],[6]   11.00%
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23],[29] $ 14,102  
Interest [2],[3],[23],[29] 5.75%  
Interest [2],[3],[23],[29] 11.20%  
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] $ 1,578  
Fair value at ending balance [1],[5],[6],[7]   $ 1,578
Interest [1],[5],[6],[7]   5.50%
Interest [1],[5],[6],[7]   9.90%
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] 5,560  
Fair value at ending balance [1],[5],[6],[7]   $ 5,560
Interest [1],[5],[6],[7]   5.75%
Interest [1],[5],[6],[7]   10.10%
Investment, Identifier [Axis]: The Hilb Group, LLC, Insurance Brokerage, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] 14,178  
Fair value at ending balance [1],[5],[6],[7]   $ 14,178
Interest [1],[5],[6],[7]   5.75%
Interest [1],[5],[6],[7]   10.10%
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] 1,019  
Fair value at ending balance $ 1,212 [3],[17] $ 1,019 [1],[6],[21]
Investment owned, balance (in shares) 676,880.98 [3],[9],[10],[17] 676,880.98 [1],[6],[13],[14],[21]
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],[5],[6],[22] $ 12,322  
Fair value at ending balance $ 12,397 [2],[3],[4] $ 12,322 [1],[5],[6],[22]
Interest 7.50% [2],[3],[4] 7.50% [1],[5],[6],[22]
Interest 12.90% [2],[3],[4] 12.10% [1],[5],[6],[22]
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 [1] $ 30,339  
Fair value at ending balance [1]   $ 30,339
Investment, Identifier [Axis]: Thompson Rivers LLC, Investment Funds & Vehicles, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[17] 13,557  
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 (16,933) (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 151 (21,306)
Fair value at ending balance 13,557 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],[5],[19] 5,801  
Fair value at ending balance $ 5,539 [2],[4] $ 5,801 [1],[5],[19]
Interest 6.00% [2],[4] 6.00% [1],[5],[19]
Interest 11.70% [2],[4] 10.70% [1],[5],[19]
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],[5],[6],[19] $ 3,561  
Fair value at ending balance $ 3,679 [2],[3],[4] $ 3,561 [1],[5],[6],[19]
Interest 6.00% [2],[3],[4] 6.00% [1],[5],[6],[19]
Interest 11.70% [2],[3],[4] 10.70% [1],[5],[6],[19]
Investment, interest rate, paid in kind 5.00% [2],[3],[4] 5.00% [1],[5],[6],[19]
Investment, Identifier [Axis]: Trader Corporation, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[62] $ 4,486  
Fair value at ending balance $ 4,542 [2],[3],[8],[63] $ 4,486 [1],[5],[6],[12],[62]
Interest 6.75% [2],[3],[8],[63] 6.75% [1],[5],[6],[12],[62]
Interest 12.10% [2],[3],[8],[63] 11.60% [1],[5],[6],[12],[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],[5],[6],[12],[62] $ (9)  
Fair value at ending balance $ (3) [2],[3],[8],[29],[63] $ (9) [1],[5],[6],[12],[62]
Interest 6.75% [2],[3],[8],[29],[63] 6.75% [1],[5],[6],[12],[62]
Interest 12.10% [2],[3],[8],[29],[63] 11.60% [1],[5],[6],[12],[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],[5],[6],[31] $ 5,872  
Fair value at ending balance $ 6,035 [2],[3],[4] $ 5,872 [1],[5],[6],[31]
Interest 4.75% [2],[3],[4] 5.00% [1],[5],[6],[31]
Interest 9.80% [2],[3],[4] 7.90% [1],[5],[6],[31]
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],[5],[6],[19] $ 11,032  
Fair value at ending balance $ 10,562 [2],[3],[32] $ 11,032 [1],[5],[6],[19]
Interest 4.50% [2],[3],[32] 4.25% [1],[5],[6],[19]
Interest 9.90% [2],[3],[32] 8.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: Trident Maritime Systems, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6] $ 14,570  
Fair value at ending balance $ 13,255 [2],[3],[4] $ 14,570 [1],[5],[6]
Interest 5.50% [2],[3],[4] 4.75% [1],[5],[6],[19]
Interest 11.00% [2],[3],[4] 9.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Trintech, Inc., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23] $ 6,755  
Interest [2],[3],[23] 6.50%  
Interest [2],[3],[23] 11.80%  
Investment, Identifier [Axis]: Trintech, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23],[29] $ 137  
Interest [2],[3],[23],[29] 6.50%  
Interest [2],[3],[23],[29] 11.80%  
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],[5],[6],[22] $ 18,756  
Fair value at ending balance $ 18,983 [2],[3],[4] $ 18,756 [1],[5],[6],[22]
Interest 6.25% [2],[3],[4] 6.25% [1],[5],[6],[22]
Interest 12.10% [2],[3],[4] 11.10% [1],[5],[6],[22]
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 [1],[6],[16] $ 0  
Fair value at ending balance $ 0 [3],[15],[17] $ 0 [1],[6],[16]
Investment owned, balance (in shares) 2.71 [3],[9],[10],[15],[17] 2.71 [1],[6],[13],[14],[16]
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 [1],[6],[16],[21] $ 0  
Fair value at ending balance $ 0 [3],[15],[17] $ 0 [1],[6],[16],[21]
Investment owned, balance (in shares) 2.8 [3],[9],[10],[15],[17] 2.8 [1],[6],[13],[14],[16],[21]
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 [1],[6],[21] $ 512  
Fair value at ending balance [1],[6],[21]   $ 512
Investment owned, balance (in shares) [1],[6],[13],[14],[21]   440.97
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, Class A LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3] $ 1,192  
Investment owned, balance (in shares) [3],[9],[10] 440.97  
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 6,758  
Interest [2],[3],[4] 5.50%  
Interest [2],[3],[4] 10.90%  
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],[5],[6],[31] $ 3,075  
Fair value at ending balance [1],[5],[6],[31]   $ 3,075
Interest [1],[5],[6],[31]   4.75%
Interest [1],[5],[6],[31]   9.90%
Investment, Identifier [Axis]: Trystar, LLC, Power Distribution Solutions, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 3,750  
Fair value at ending balance [1],[5],[6],[19]   $ 3,750
Interest [1],[5],[6],[19]   5.00%
Interest [1],[5],[6],[19]   9.60%
Investment, Identifier [Axis]: Turbo Buyer, Inc., Finance Companies, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] 8,061  
Fair value at ending balance $ 7,970 [2],[3],[4] $ 8,061 [1],[5],[6],[19]
Interest 6.00% [2],[3],[4] 6.00% [1],[5],[6],[19]
Interest 11.60% [2],[3],[4] 10.70% [1],[5],[6],[19]
Investment, Identifier [Axis]: Turnberry Solutions, Inc., Consumer Cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] $ 4,900  
Fair value at ending balance $ 4,890 [2],[3],[4] $ 4,900 [1],[5],[6],[22]
Interest 5.75% [2],[3],[4] 6.25% [1],[5],[6],[22]
Interest 11.40% [2],[3],[4] 9.20% [1],[5],[6],[22]
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],[5],[7],[12] $ 1,439  
Fair value at ending balance [1],[5],[7],[12]   $ 1,439
Interest [1],[5],[7],[12]   4.00%
Interest [1],[5],[7],[12]   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],[5],[6],[12],[34] 9,677  
Fair value at ending balance $ 10,304 [2],[3],[8],[35] $ 9,677 [1],[5],[6],[12],[34]
Interest 4.50% [2],[3],[8],[35] 7.25% [1],[5],[6],[12],[34]
Interest 4.50% [2],[3],[8],[35] 10.80% [1],[5],[6],[12],[34]
Investment, interest rate, paid in kind [2],[3],[8],[35] 3.40%  
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), Legal Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[23] $ 9,932  
Interest [2],[3],[23] 5.75%  
Interest [2],[3],[23] 11.10%  
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), Legal Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] $ 15,390  
Fair value at ending balance [1],[5],[6],[22]   $ 15,390
Interest [1],[5],[6],[22]   5.75%
Interest [1],[5],[6],[22]   10.50%
Investment, Identifier [Axis]: Union Bidco Limited, Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[34] 847  
Fair value at ending balance $ 828 [2],[3],[8],[35] $ 847 [1],[5],[6],[12],[34]
Interest 6.00% [2],[3],[8],[35] 5.75% [1],[5],[6],[12],[34]
Interest 11.20% [2],[3],[8],[35] 9.20% [1],[5],[6],[12],[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],[5],[6],[12],[33] $ 1,180  
Fair value at ending balance $ 1,303 [2],[3],[8],[25] $ 1,180 [1],[5],[6],[12],[33]
Interest 5.75% [2],[3],[8],[25] 5.50% [1],[5],[6],[12],[33]
Interest 9.20% [2],[3],[8],[25] 8.30% [1],[5],[6],[12],[33]
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 [2],[3],[8],[25] $ 1,947  
Interest [2],[3],[8],[25] 6.25%  
Interest [2],[3],[8],[25] 10.20%  
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[24] $ 1,585  
Fair value at ending balance $ 1,513 [2],[3],[8],[25] $ 1,585 [1],[5],[6],[12],[24]
Interest 4.75% [2],[3],[8],[25] 6.00% [1],[5],[6],[12],[24]
Interest 8.40% [2],[3],[8],[25] 8.20% [1],[5],[6],[12],[24]
Investment, interest rate, paid in kind [25] 1.80%  
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[19] $ 3,483  
Fair value at ending balance $ 3,352 [2],[3],[4],[8] $ 3,483 [1],[5],[6],[12],[19]
Interest 4.75% [2],[3],[4],[8] 5.25% [1],[5],[6],[12],[19]
Interest 10.40% [2],[3],[4],[8] 8.90% [1],[5],[6],[12],[19]
Investment, interest rate, paid in kind [4] 1.80%  
Investment, Identifier [Axis]: VOYA CLO 2015-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[12],[16] $ 91  
Fair value at ending balance 91 [8],[15] $ 91 [1],[12],[16]
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 [1],[12],[16] 1,551  
Fair value at ending balance 1,398 [8],[15] 1,551 [1],[12],[16]
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],[5],[6],[7] 4,673  
Fair value at ending balance $ 4,783 [2],[3],[32] $ 4,673 [1],[5],[6],[7]
Interest 5.25% [2],[3],[32] 4.75% [1],[5],[6],[7]
Interest 10.90% [2],[3],[32] 9.10% [1],[5],[6],[7]
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 [1],[6],[16],[21] $ 2  
Fair value at ending balance $ 2 [3],[15],[17] $ 2 [1],[6],[16],[21]
Investment owned, balance (in shares) 4,676 [3],[9],[10],[15],[17] 4,676 [1],[6],[13],[14],[16],[21]
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 [1],[6],[16],[21] $ 3  
Fair value at ending balance $ 3 [3],[15],[17] $ 3 [1],[6],[16],[21]
Investment owned, balance (in shares) 5,591 [3],[9],[10],[15],[17] 5,591 [1],[6],[13],[14],[16],[21]
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],[5],[6],[12],[38] $ 3,238  
Fair value at ending balance $ 3,474 [2],[3],[8],[35] $ 3,238 [1],[5],[6],[12],[38]
Interest 6.50% [2],[3],[8],[35] 6.50% [1],[5],[6],[12],[38]
Interest 11.40% [2],[3],[8],[35] 7.70% [1],[5],[6],[12],[38]
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],[5],[6],[12],[34] $ 407  
Fair value at ending balance [1],[5],[6],[12],[34]   $ 407
Interest [1],[5],[6],[12],[34]   6.50%
Interest [1],[5],[6],[12],[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],[5],[16],[19] 4,771  
Fair value at ending balance $ 5,820 [2],[4],[15] $ 4,771 [1],[5],[16],[19]
Interest 7.25% [2],[4],[15] 7.25% [1],[5],[16],[19]
Interest 12.90% [2],[4],[15] 11.60% [1],[5],[16],[19]
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 [1],[6] $ 3,792  
Fair value at ending balance $ 3,136 [3] $ 3,792 [1],[6]
Interest 6.30% [3] 6.30% [1],[6]
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],[5],[6],[19] $ 7,645  
Fair value at ending balance $ 7,558 [2],[3],[4] $ 7,645 [1],[5],[6],[19]
Interest 5.50% [2],[3],[4] 5.50% [1],[5],[6],[19]
Interest 10.90% [2],[3],[4] 10.20% [1],[5],[6],[19]
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 293  
Fair value at ending balance $ 298 [3],[17] $ 293 [1],[6],[21]
Investment owned, balance (in shares) 16,442.9 [3],[9],[10],[17] 16,442.9 [1],[6],[13],[14],[21]
Investment, Identifier [Axis]: W2O Holdings, Inc., Healthcare Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[32] $ 5,823  
Interest [3],[32] 5.25%  
Interest [3],[32] 10.80%  
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],[5],[6],[19] $ 3,302  
Fair value at ending balance [1],[5],[6],[19]   $ 3,302
Interest [1],[5],[6],[19]   4.75%
Interest [1],[5],[6],[19]   9.50%
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC,Insurance, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 2,400  
Interest [2],[3],[4] 6.25%  
Interest [2],[3],[4] 11.70%  
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] $ 13,937  
Fair value at ending balance [1],[5],[6],[22]   $ 13,937
Interest [1],[5],[6],[22]   6.00%
Interest [1],[5],[6],[22]   10.60%
Investment, Identifier [Axis]: WWEC Holdings III CORP, Capital Goods, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[22] 1,056  
Fair value at ending balance [1],[5],[6],[22]   $ 1,056
Interest [1],[5],[6],[22]   6.00%
Interest [1],[5],[6],[22]   10.60%
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ 14,266  
Interest [2],[3],[4],[29] 6.00%  
Interest [2],[3],[4],[29] 11.40%  
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ 373  
Interest [2],[3],[4],[29] 6.00%  
Interest [2],[3],[4],[29] 11.40%  
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 [1],[12] $ 20,212  
Fair value at ending balance [1],[12]   $ 20,212
Investment, Identifier [Axis]: Waccamaw River LLC, Investment Funds & Vehicles, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8] 18,763  
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 20,212 13,501
Gross Additions 2,480 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 (3,929) (2,089)
Fair value at ending balance 18,763 20,212
Amount of Interest or Dividends Credited to Income 1,460 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 [1],[6],[16],[21] 0  
Fair value at ending balance [1],[6],[16],[21]   $ 0
Investment owned, balance (in shares) [1],[6],[13],[14],[16],[21]   2,819.53
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[15],[17] 0  
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity (1.62% Partnership Interest)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[16],[21] 0  
Fair value at ending balance [1],[6],[16],[21]   $ 0
Investment, Identifier [Axis]: Wawona Delaware Holdings, LLC, Beverage & Food, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[16],[19] 33  
Fair value at ending balance $ 9 [4],[15],[20] $ 33 [1],[16],[19]
Interest 4.75% [4],[15],[20] 4.75% [1],[16],[19]
Interest [1],[16],[19]   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 [1],[6] $ 13,153  
Fair value at ending balance $ 11,096 [3] $ 13,153 [1],[6]
Interest 12.00% [3] 12.00% [1],[6]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4] $ 8,337  
Interest [2],[3],[4] 7.00%  
Interest [2],[3],[4] 12.30%  
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [3],[17] $ 630  
Investment owned, balance (in shares) [3],[9],[10],[17] 63,087.1  
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[3],[4],[29] $ (65)  
Interest [2],[3],[4],[29] 7.00%  
Interest [2],[3],[4],[29] 12.30%  
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],[5],[16],[19] $ 41  
Fair value at ending balance $ 45 [2],[4],[15] $ 41 [1],[5],[16],[19]
Interest 6.25% [2],[4],[15] 6.50% [1],[5],[16],[19]
Interest 11.80% [2],[4],[15] 11.20% [1],[5],[16],[19]
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 [1],[6],[21] $ 1,012  
Fair value at ending balance $ 1,082 [3],[17] $ 1,012 [1],[6],[21]
Investment owned, balance (in shares) 1,663.31 [3],[9],[10],[17] 1,663.31 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ 4,882  
Fair value at ending balance $ 5,007 [2],[3],[4] $ 4,882 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4] 5.75% [1],[5],[6],[19]
Interest 11.30% [2],[3],[4] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[19] $ 1,556  
Fair value at ending balance $ 1,062 [2],[3],[4],[29] $ 1,556 [1],[5],[6],[19]
Interest 5.75% [2],[3],[4],[29] 5.75% [1],[5],[6],[19]
Interest 11.30% [2],[3],[4],[29] 10.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[7] $ 8,821  
Fair value at ending balance $ 8,767 [2],[3],[23] $ 8,821 [1],[5],[6],[7]
Interest 4.75% [2],[3],[23] 4.75% [1],[5],[6],[7]
Interest 10.40% [2],[3],[23] 9.10% [1],[5],[6],[7]
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],[5],[6],[7] $ 2,428  
Fair value at ending balance $ 2,414 [2],[3],[23] $ 2,428 [1],[5],[6],[7]
Interest 5.25% [2],[3],[23] 5.25% [1],[5],[6],[7]
Interest 10.60% [2],[3],[23] 9.60% [1],[5],[6],[7]
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 [1],[6],[12],[21] $ 549  
Fair value at ending balance $ 557 [3],[8],[17] $ 549 [1],[6],[12],[21]
Investment owned, balance (in shares) 45,665,825 [3],[8],[9],[10],[17] 45,665,825 [1],[6],[12],[13],[14],[21]
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],[5],[6],[12],[34] $ 5,446  
Fair value at ending balance $ 6,153 [2],[3],[8],[29],[35] $ 5,446 [1],[5],[6],[12],[34]
Interest 5.25% [2],[3],[8],[29],[35] 5.25% [1],[5],[6],[12],[34]
Interest 10.40% [2],[3],[8],[29],[35] 8.20% [1],[5],[6],[12],[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 [1],[6],[12] $ 2,502  
Fair value at ending balance $ 3,095 [3],[8] $ 2,502 [1],[6],[12]
Investment, interest rate, paid in kind 11.00% [3],[8] 11.00% [1],[6],[12]
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],[5],[6],[19] $ 2,628  
Fair value at ending balance $ 6,146 [2],[3],[4],[29] $ 2,628 [1],[5],[6],[19]
Interest 6.00% [2],[3],[4],[29] 4.75% [1],[5],[6],[19]
Interest 11.40% [2],[3],[4],[29] 9.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[6],[21] $ 189  
Fair value at ending balance $ 153 [3] $ 189 [1],[6],[21]
Investment owned, balance (in shares) 152.69 [3],[9],[10] 152.69 [1],[6],[13],[14],[21]
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],[5],[6],[19] $ (12)  
Fair value at ending balance $ 15 [2],[3],[4],[29] $ (12) [1],[5],[6],[19]
Interest 6.00% [2],[3],[4],[29] 4.75% [1],[5],[6],[19]
Interest 11.40% [2],[3],[4],[29] 9.50% [1],[5],[6],[19]
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Services: Business, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[5],[6],[12],[45] $ 5,162  
Fair value at ending balance $ 5,415 [2],[3],[8],[29],[35] $ 5,162 [1],[5],[6],[12],[45]
Interest 6.25% [2],[3],[8],[29],[35] 6.25% [1],[5],[6],[12],[45]
Interest 11.40% [2],[3],[8],[29],[35] 9.20% [1],[5],[6],[12],[45]
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],[5],[6],[7] $ 3,262  
Fair value at ending balance $ 3,475 [2],[3],[23] $ 3,262 [1],[5],[6],[7]
Interest 5.00% [2],[3],[23] 5.00% [1],[5],[6],[7]
Interest 10.30% [2],[3],[23] 9.40% [1],[5],[6],[7]
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],[5],[6],[7] $ (9)  
Fair value at ending balance $ 0 [2],[3],[23],[29] $ (9) [1],[5],[6],[7]
Interest 5.00% [2],[3],[23],[29] 5.00% [1],[5],[6],[7]
Interest 10.30% [2],[3],[23],[29] 9.40% [1],[5],[6],[7]
1888 Industrial Services, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] $ 1,263  
Fair value at ending balance 1,127 [11] $ 1,263 [1]
Eclipse Business Capital, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 144,884  
Fair value at ending balance 156,327 144,884 [1]
Hylan Datacom And Electrical, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 12,511  
Fair value at ending balance 11,944 [11] 12,511 [1]
Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 40,088  
Fair value at ending balance 41,233 [11] 40,088 [1]
Kemmerer Operations LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 2,746  
Fair value at ending balance 3,048 [11] 2,746 [1]
Rocade Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11] 59,354  
Security Holdings B.V.    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 72,872  
Fair value at ending balance 57,500 [44] 72,872 [1]
Sierra Senior Loan Strategy JV I, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 37,950  
Fair value at ending balance 42,088 [11] 37,950 [1]
Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 30,339  
Fair value at ending balance 13,557 [11] 30,339 [1]
Waccamaw River, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 20,212  
Fair value at ending balance 18,763 20,212 [1]
Black Angus Steakhouses, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 14,794  
Fair value at ending balance 12,204 [44] 14,794 [1]
MVC Automotive Group GmbH    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 16,824  
Fair value at ending balance 24,154 [44] 16,824 [1]
MVC Private Equity Fund LP    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 1,838  
Fair value at ending balance 1,005 [44] 1,838 [1]
Coastal Marina Holdings, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] 32,293  
Fair value at ending balance 34,905 [11] 32,293 [1]
Affiliate investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 289,993 [1] 288,069
Gross Additions 118,083 127,617
Gross Reductions (39,475) (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 13,745 (916)
Fair value at ending balance 382,346 289,993 [1]
Amount of Interest or Dividends Credited to Income 26,453 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 20 1,917
Gross Reductions (37) 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) (654)
Fair value at ending balance 1,127 1,263
Amount of Interest or Dividends Credited to Income 149 (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 21,282 8,677
Gross Reductions (21,454) (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 11,615 38,801
Fair value at ending balance 156,327 144,884
Amount of Interest or Dividends Credited to Income 11,238 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 399 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 (966) (476)
Fair value at ending balance 11,944 12,511
Amount of Interest or Dividends Credited to Income 932 762
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 1,145 (2,513)
Fair value at ending balance 41,233 40,088
Amount of Interest or Dividends Credited to Income 4,282 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 198 4,374
Gross Reductions (1,051) (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 1,155 (408)
Fair value at ending balance 3,048 2,746
Amount of Interest or Dividends Credited to Income 149 307
Affiliate investments | Rocade Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 0  
Gross Additions 58,841  
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 513  
Fair value at ending balance 59,354 0
Amount of Interest or Dividends Credited to Income 3,841  
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 4,138 (12,271)
Fair value at ending balance 42,088 37,950
Amount of Interest or Dividends Credited to Income 3,873 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 (16,933) (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 151 (21,306)
Fair value at ending balance 13,557 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 2,480 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 (3,929) (2,089)
Fair value at ending balance 18,763 20,212
Amount of Interest or Dividends Credited to Income 1,460 1,850
Affiliate investments | Coastal Marina Holdings, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 0  
Gross Additions 34,863  
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 42  
Fair value at ending balance 34,905 0
Amount of Interest or Dividends Credited to Income 529  
Control investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 106,328 [1] 22,412
Gross Additions 6,795 99,701
Gross Reductions (595) (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 (17,665) 9,498
Fair value at ending balance 94,863 [44] 106,328 [1]
Amount of Interest or Dividends Credited to Income 2,057 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 3,911 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 (19,283) 15,173
Fair value at ending balance 57,500 72,872
Amount of Interest or Dividends Credited to Income 850 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 417 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 (3,007) (481)
Fair value at ending balance 12,204 14,794
Amount of Interest or Dividends Credited to Income 688 544
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 2,467 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 4,863 1,976
Fair value at ending balance 24,154 16,824
Amount of Interest or Dividends Credited to Income 439 435
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 (595) 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 (238) (5,726)
Fair value at ending balance 1,005 1,838
Amount of Interest or Dividends Credited to Income $ 80 $ (831)
[1] All of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.
[2] Debt investment includes interest rate floor feature.
[3] The fair value of the investment was determined using significant unobservable inputs.
[4] The interest rate on these loans is subject to 3 Month SOFR, which as of September 30, 2023 was 5.39550%.
[5] Debt investment includes interest rate floor feature.
[6] The fair value of the investment was determined using significant unobservable inputs.
[7] The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.
[8] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 25.9% of total investments at fair value as of September 30, 2023. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets. If at any time qualifying assets do not represent at least 70% of the Company’s total assets, the Company will be precluded from acquiring any additional non-qualifying asset until such time as it complies with the requirements of Section 55(a).
[9] All debt investments are income producing, unless otherwise noted. The Company’s external investment adviser, Barings, determines in good faith the fair value of the Company’s investments in accordance with a valuation policy and processes established by the Adviser, which have been approved by the Company’s board of directors (the “Board”), and the Investment Company Act of 1940, as amended (the “1940 Act”). In addition, all debt investments are variable rate investments unless otherwise noted. Index-based floating interest rates are generally subject to a contractual minimum interest rate. Variable rate loans to the Company’s portfolio companies bear interest at a rate that may be determined by reference to the Secured Overnight Financing Rate (“SOFR”), the Euro Interbank Offered Rate (“EURIBOR”), the Bank Bill Swap Bid Rate (“BBSY”), the Stockholm Interbank Offered Rate (“STIBOR”), the Canadian Dollar Offered Rate (“CDOR”), the Sterling Overnight Index Average (“SONIA”), the Swiss Average Rate Overnight (“SARON”), the Norwegian Interbank Offered Rate (“NIBOR”), the Bank Bill Market rate (“BKBM”) or an alternate base rate (commonly based on the Federal Funds Rate or the Prime Rate), at the borrower’s option, which reset annually, semi-annually, quarterly or monthly. For each such loan, the Company has provided the interest rate in effect on the date presented. SOFR-based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread. The borrower may also elect to have multiple interest reset periods for each loan.
[10] All of the Company’s portfolio company investments (including joint venture investments), which as of September 30, 2023 represented 210.4% of the Company’s net assets, are subject to legal restrictions on sales. The acquisition date represents the date of the Company's initial investment in the relevant portfolio company.
[11] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of the portfolio company as the Company owns between 5% or more, up to 25% (inclusive), of the portfolio company’s voting securities (“non-controlled affiliate”). Transactions related to investments in non-controlled “Affiliate Investments” for the nine months ended September 30, 2023 were as follows:
December 31, 2022
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)September 30, 2023
 Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
1888 Industrial Services, LLC(d)
First Lien Senior Secured Term Loan (SOFR + 5.00%)(e)
$— $20 $(22)$— $$— $50 
Revolver (SOFR + 5.00%)(e)
1,263 — (15)— (121)1,127 99 
Warrants (7,546.76 units)
— — — — — — — 
1,263 20 (37)— (119)1,127 149 
Coastal Marina Holdings, LLC
(d)
Subordinated Term Loan (8.0% Cash)
— 15,610 — — 15,618 350 
Subordinated Term Loan (10.0% PIK)
— 6,521 — — 6,526 179 
LLC Units (2,407,825 units)
— 12,732 — — 29 12,761 — 
— 34,863 — — 42 34,905 529 
Eclipse Business Capital, LLC(d)
Revolver (SOFR + 7.25%, 12.6%, Cash)
5,273 20,924 (21,454)— (15)4,728 350 
Second Lien Senior Secured Term Loan (7.5% Cash)
4,545 — — (4)4,545 259 
LLC units (89,447,396 units)
135,066 354 — — 11,634 147,054 10,629 
144,884 21,282 (21,454)— 11,615 156,327 11,238 
Hylan Datacom & Electrical LLC(d)
First Lien Senior Secured Term Loan (SOFR + 8.00%, 13.1% Cash)
3,917 56 — — (56)3,917 441 
Second Lien Senior Secured Term Loan (SOFR + 10.00%, 15.3% Cash)
4,098 343 — — — 4,441 491 
Common Stock (102,144 shares)
4,496 — — — (910)3,586 — 
12,511 399 — — (966)11,944 932 
Jocassee Partners LLC
9.1% Member Interest
40,088 — — — 1,145 41,233 4,282 
40,088 — — — 1,145 41,233 4,282 
Kemmerer Operations, LLC(d)
First Lien Senior Secured Term Loan (15.0% PIK)
1,565 198 (1,051)— — 712 149 
Common Stock (6.78 shares)
1,181 — — — 1,155 2,336 — 
2,746 198 (1,051)— 1,155 3,048 149 
Rocade Holdings LLC(d)
Preferred LP Units (55,000 units) (SOFR + 6.0% PIK, 11.4% PIK)
— 58,841 — — 58,850 3,841 
Common LP Units (23.8 units)
— — — — 504 504 — 
— 58,841 — — 513 59,354 3,841 
Sierra Senior Loan Strategy JV I LLC
89.01% Member Interest
37,950 — — — 4,138 42,088 3,873 
37,950 — — — 4,138 42,088 3,873 
Thompson Rivers LLC
16.0% Member Interest
30,339 — (16,933)— 151 13,557 — 
30,339 — (16,933)— 151 13,557 — 
Waccamaw River LLC
20% Member Interest
20,212 2,480 — — (3,929)18,763 1,460 
20,212 2,480 — — (3,929)18,763 1,460 
Total Affiliate Investments$289,993 $118,083 $(39,475)$ $13,745 $382,346 $26,453 
(a)     Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)    Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c) Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Affiliate category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.
[12] 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).
[13] 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.
[14] 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.
[15] 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.
[16] 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.
[17] Investment is non-income producing.
[18] Non-accrual investment.
[19] The interest rate on these loans is subject to 3 Month LIBOR, which as of December 31, 2022 was 4.76729%.
[20] Non-accrual investment.
[21] Investment is non-income producing.
[22] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2022 was 4.58745%.
[23] The interest rate on these loans is subject to 1 Month SOFR, which as of September 30, 2023 was 5.31899%.
[24] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2022 was 2.13200%.
[25] The interest rate on these loans is subject to 3 Month EURIBOR, which as of September 30, 2023 was 3.95200%.
[26] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2022 was 3.01500%.
[27] The interest rate on these loans is subject to 1 Month BBSY, which as of September 30, 2023 was 4.05130%.
[28] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2022 was 4.35806%.
[29] Position or portion thereof is an unfunded loan or equity commitment.
[30] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2022 was 4.78131%.
[31] The interest rate on these loans is subject to 6 Month LIBOR, which as of December 31, 2022 was 5.13886%.
[32] The interest rate on these loans is subject to 6 Month SOFR, which as of September 30, 2023 was 5.46727%.
[33] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2022 was 2.69300%.
[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 September 30, 2023 was 5.28980%.
[36] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2022 was 1.88400%.
[37] The interest rate on these loans is subject to 6 Month EURIBOR, which as of September 30, 2023 was 4.12500%.
[38] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2022 was 4.09490%.
[39] The interest rate on these loans is subject to 6 Month SONIA, which as of September 30, 2023 was 5.38530%.
[40] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2022 was 3.76500%.
[41] The interest rate on these loans is subject to 3 Month BBSY, which as of September 30, 2023 was 4.14000%.
[42] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2022 was 2.70100%.
[43] The interest rate on these loans is subject to 3 Month STIBOR, which as of September 30, 2023 was 4.06200%.
[44] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” and “control” the portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the nine months ended September 30, 2023 in which the portfolio company is deemed to be a “Control Investment” of the Company were as follows:
December 31, 2022
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)September 30, 2023
Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Black Angus Steakhouses, LLC(d)
First Lien Senior Secured Term Loan (SOFR + 9.00%, 14.3% Cash)
$5,647 $417 $— $— $— $6,064 $688 
First Lien Senior Secured Term Loan (10.0% PIK)(e)
9,147 — — — (3,007)6,140 — 
LLC Units (44.6 units)
— — — — — — — 
14,794 417 — — (3,007)12,204 688 
MVC Automotive Group GmbH(d)
Bridge Loan (4.5% Cash, 1.5% PIK)
7,149 2,467 — — — 9,616 439 
Common Equity Interest (18,000 Shares)
9,675 — — — 4,863 14,538 — 
16,824 2,467 — — 4,863 24,154 439 
MVC Private Equity Fund LP
General Partnership Interest
(1,831.4 units)
45 — (15)— (6)24 80 
Limited Partnership Interest
(71,790.4 units)
1,793 — (580)— (232)981 — 
1,838 — (595)— (238)1,005 80 
Security Holdings B.V(d)
Bridge Loan (5.0% PIK,)
6,020 152 — — — 6,172 230 
2023 Revolver (6.0% Cash)
— 3,293 — — (117)3,176 71 
Senior Subordinated Term Loan (3.1% PIK)
10,534 313 — — — 10,847 283 
Senior Unsecured Term Loan (6.0% Cash, 9.0% PIK)
2,015 153 — — (26)2,142 266 
Common Stock Series A (17,100 shares)
575 — — — (202)373 — 
Common Stock Series B (1,236 shares)
53,728 — — — (18,938)34,790 — 
72,872 3,911 — — (19,283)57,500 850 
Total Control Investments$106,328 $6,795 $(595)$ $(17,665)$94,863 $2,057 
(a) Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)     Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c)    Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.
[45] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2022 was 3.43570%.
[46] The interest rate on these loans is subject to 1 Month SONIA, which as of September 30, 2023 was 5.19860%.
[47] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2022 was 4.93500%.
[48] The interest rate on these loans is subject to 1 Month NIBOR, which as of September 30, 2023 was 4.49000%.
[49] 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.
[50] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2022 was 3.26470%.
[51] The interest rate on these loans is subject to 6 Month BBSY, which as of September 30, 2023 was 4.40460%.
[52] The interest rate on these loans is subject to 1 Month EURIBOR, which as of September 30, 2023 was 3.84700%.
[53] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2022 was 4.53000%.
[54] The interest rate on these loans is subject to 3 Month BKBM, which as of September 30, 2023 was 5.68000%.
[55] The interest rate on these loans is subject to 6 Month SARON, which as of September 30, 2023 was 1.71489%.
[56] Fair value as a percentage of net assets.
[57] Investment was purchased as part of the MVC Acquisition and is part of the MVC Reference Portfolio for purposes of the MVC Credit Support Agreement.
[58] The interest rate on these loans is subject to Prime, which as of December 31, 2022 was 7.50000%.
[59] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2022 was 3.04000%.
[60] The interest rate on these loans is subject to 3 Month CDOR, which as of September 30, 2023 was 5.51250%.
[61] The interest rate on these loans is subject to 3 Month SARON, which as of December 31, 2022 was 0.94212%.
[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 September 30, 2023 was 5.38500%.