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Unaudited Consolidated Schedule of Investments - Schedule Of Investments (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 2,488,715  
Fair value at ending balance $ 2,416,714 $ 2,488,715
Investment, interest rate, paid in kind [1],[2],[3],[4]   3.30%
Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 9.10% [5],[6],[7],[8],[9] 9.10% [3],[10],[11],[12],[13]
Sierra Senior Loan Strategy JV I, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 89.01% [5],[7],[8],[9],[14],[15] 89.01% [3],[10],[12],[13],[16]
Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 16.00% [5],[7],[8],[15],[17] 16.00% [10],[12],[13],[18]
Waccamaw River, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 20.00% [5],[7],[8],[9],[15] 20.00% [3],[10],[12],[13],[18]
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 [19] $ 0 $ 0
Gross Additions [19],[20]   41
Gross Reductions [19],[21]   (41)
Amount of Realized Gain (Loss) [19]   (418)
Amount of Unrealized Gain (Loss) [19]   418
Fair value at ending balance [19]   0
Amount of Interest or Dividends Credited to Income [19],[22]   $ 67
Interest   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 [19] 0 $ 1,263
Gross Additions [19],[20]   14
Gross Reductions [19],[21]   (1,156)
Amount of Realized Gain (Loss) [19]   (357)
Amount of Unrealized Gain (Loss) [19]   236
Fair value at ending balance [19]   0
Amount of Interest or Dividends Credited to Income [19],[22]   $ 127
Interest   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 [19] 0 $ 0
Gross Additions [19],[20]   0
Gross Reductions [19],[21]   0
Amount of Realized Gain (Loss) [19]   0
Amount of Unrealized Gain (Loss) [19]   0
Fair value at ending balance [19]   0
Amount of Interest or Dividends Credited to Income [19],[22]   $ 0
Investment owned, balance (in shares)   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 ending balance [15],[23],[24] $ 7,067  
Interest [15],[23],[24] 4.75%  
Interest [15],[23],[24] 10.20%  
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 [2],[4],[25] $ 7,124  
Fair value at ending balance [2],[4],[25]   $ 7,124
Interest [2],[4],[25]   5.00%
Interest [2],[4],[25]   10.40%
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 ending balance [9],[15],[26] $ 8,367  
Interest [9],[15],[26] 7.10%  
Interest [9],[15],[26] 7.10%  
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 [3],[4] $ 11,688  
Fair value at ending balance [3],[4]   $ 11,688
Interest [3],[4]   14.30%
Investment, Identifier [Axis]: AD Bidco, Inc., Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 9,918  
Interest [6],[15],[23],[24] 6.25%  
Interest [6],[15],[23],[24] 11.20%  
Investment, Identifier [Axis]: AD Bidco, Inc., Technology, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ (72)  
Interest [15],[23],[24] 6.25%  
Interest [15],[23],[24] 11.20%  
Investment, Identifier [Axis]: AD Bidco, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (27)  
Interest [6],[15],[23],[24] 6.25%  
Interest [6],[15],[23],[24] 11.20%  
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],[2],[3],[4] $ 5,392  
Fair value at ending balance $ 6,296 [9],[15],[23],[24] $ 5,392 [1],[2],[3],[4]
Interest 9.25% [9],[15],[23],[24] 9.25% [1],[2],[3],[4]
Interest 14.10% [9],[15],[23],[24] 14.60% [1],[2],[3],[4]
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 [4],[18] $ 537  
Fair value at ending balance [4],[18]   $ 537
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   348.68
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 ending balance [15],[17] $ 510  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 348.68  
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 [2],[4],[27] $ 6,402  
Fair value at ending balance $ 6,460 [15],[23],[24] $ 6,402 [2],[4],[27]
Interest 7.50% [15],[23],[24] 7.50% [2],[4],[27]
Interest 12.90% [15],[23],[24] 13.00% [2],[4],[27]
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 ending balance [9],[14] $ 2,542  
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 ending balance [9],[14] 1,348  
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 beginning balance [3],[16],[18] 2,468  
Fair value at ending balance [3],[16],[18]   $ 2,468
Investment, Identifier [Axis]: AMMC CLO 23, Ltd. Series 2020-23A, Multi-Sector Holdings, Subordinated Structured Notes 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[16] 1,476  
Fair value at ending balance [3],[16]   1,476
Investment, Identifier [Axis]: APC1 Holding, Diversified Manufacturing, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[28] 2,505  
Fair value at ending balance $ 2,548 [9],[15],[24],[29] $ 2,505 [2],[3],[4],[28]
Interest 5.15% [9],[15],[24],[29] 5.50% [2],[3],[4],[28]
Interest 8.50% [9],[15],[24],[29] 9.40% [2],[3],[4],[28]
Investment, Identifier [Axis]: APOG Bidco Pty Ltd, Healthcare, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[30] $ 2,086  
Fair value at ending balance $ 968 [9],[15],[24],[31] $ 2,086 [2],[3],[4],[30]
Interest 7.30% [9],[15],[24],[31] 7.25% [2],[3],[4],[30]
Interest 11.80% [9],[15],[24],[31] 11.60% [2],[3],[4],[30]
Investment, Identifier [Axis]: AQA Acquisition Holding, Inc., High Tech Industries, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 19,938  
Fair value at ending balance $ 20,000 [15],[23],[24] $ 19,938 [1],[2],[4]
Interest 7.50% [15],[23],[24] 7.50% [1],[2],[4]
Interest 12.90% [15],[23],[24] 13.00% [1],[2],[4]
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 [4] $ 703  
Fair value at ending balance [4]   $ 703
Investment owned, balance (in shares) [4],[10],[12],[13]   25,718.2
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 ending balance [15] $ 861  
Investment owned, balance (in shares) [5],[7],[8],[15] 25,718.2  
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 [2],[4],[27] $ 9,035  
Fair value at ending balance $ 7,530 [15],[24],[32] $ 9,035 [2],[4],[27]
Interest 4.75% [15],[24],[32] 4.75% [2],[4],[27]
Interest 10.10% [15],[24],[32] 10.10% [2],[4],[27]
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 [6],[15],[24],[32] $ 0  
Interest [6],[15],[24],[32] 4.75%  
Interest [6],[15],[24],[32] 10.10%  
Investment, Identifier [Axis]: ASC Communications, LLC, Media & Entertainment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ (9)  
Fair value at ending balance [2],[4],[11],[27]   $ (9)
Interest [2],[4],[11],[27]   4.75%
Interest [2],[4],[11],[27]   10.10%
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 8,250  
Fair value at ending balance [1],[2],[4]   $ 8,250
Interest [1],[2],[4]   5.50%
Interest [1],[2],[4]   10.90%
Investment, Identifier [Axis]: ATL II MRO Holdings Inc, Transportation, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 0  
Fair value at ending balance [1],[2],[4],[11]   $ 0
Interest [1],[2],[4],[11]   5.50%
Interest [1],[2],[4],[11]   10.90%
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 ending balance [15],[23],[24] $ 8,196  
Interest [15],[23],[24] 5.50%  
Interest [15],[23],[24] 10.70%  
Investment, Identifier [Axis]: ATL II MRO Holdings Inc., Transportation, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (15)  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.70%  
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance $ 7,045  
Interest 5.00%  
Investment, interest rate, paid in kind 10.00%  
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 ending balance [23],[24] $ 1  
Interest [23],[24] 3.25%  
Interest [23],[24] 8.40%  
Investment, interest rate, paid in kind [23],[24] 0.30%  
Investment, Identifier [Axis]: AVSC Holding Corp., Advertising, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [23],[24] $ 2  
Interest [23],[24] 4.50%  
Interest [23],[24] 9.40%  
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 $ 6,332  
Fair value at ending balance   $ 6,332
Interest   5.00%
Investment, interest rate, paid in kind   10.00%
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class A Convertible Preferred Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] 5,858  
Fair value at ending balance [4],[18]   $ 5,858
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   5,000
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 ending balance [15],[17] $ 6,220  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 5,000  
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 [4],[18] $ 1,950  
Fair value at ending balance [4],[18]   $ 1,950
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   1,651
Investment, Identifier [Axis]: Accelerant Holdings, Banking, Finance, Insurance & Real Estate, Class B Convertible Preferred Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 2,196  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 1,651  
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 ending balance [9],[15],[24],[33] $ 2,447  
Interest [9],[15],[24],[33] 6.75%  
Interest [9],[15],[24],[33] 11.80%  
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 [2],[3],[4],[25] $ 2,461  
Fair value at ending balance [2],[3],[4],[25]   $ 2,461
Interest [2],[3],[4],[25]   6.25%
Interest [2],[3],[4],[25]   11.60%
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 [4],[18] 512  
Fair value at ending balance [4],[18]   $ 512
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   437,623.3
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 411  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 437,623.3  
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 11,768  
Fair value at ending balance $ 11,919 [15],[23],[24] $ 11,768 [1],[2],[4]
Interest 5.25% [15],[23],[24] 5.25% [1],[2],[4]
Interest 10.30% [15],[23],[24] 10.80% [1],[2],[4]
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Aerospace & Defense, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 1,602  
Fair value at ending balance $ 1,821 [6],[15],[23],[24] $ 1,602 [1],[2],[4],[11]
Interest 5.25% [6],[15],[23],[24] 5.25% [1],[2],[4],[11]
Interest 10.30% [6],[15],[23],[24] 10.80% [1],[2],[4],[11]
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 [2],[3],[4],[28] $ 7,226  
Fair value at ending balance $ 6,414 [9],[15],[24],[34] $ 7,226 [2],[3],[4],[28]
Interest 4.00% [9],[15],[24],[34] 4.65% [2],[3],[4],[28]
Interest 2.90% [9],[15],[24],[34] 8.60% [2],[3],[4],[28]
Investment, interest rate, paid in kind 6.60% [9],[15],[24],[34] 2.30% [2],[3],[4],[28]
Investment, Identifier [Axis]: Adhefin International, Industrial Other, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ 1,444  
Interest [6],[9],[15],[24],[29] 6.00%  
Interest [6],[9],[15],[24],[29] 9.30%  
Investment, Identifier [Axis]: Adhefin International, Industrial Other, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 401  
Interest [9],[15],[24],[29] 6.25%  
Interest [9],[15],[24],[29] 9.60%  
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 beginning balance [2],[3],[4],[11],[28] $ 1,778  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 1,778
Interest [2],[3],[4],[11],[28]   6.50%
Interest [2],[3],[4],[11],[28]   10.40%
Investment, Identifier [Axis]: Adhefin International, Industrial Other, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 350  
Interest [9],[15],[24],[29] 10.50%  
Investment, interest rate, paid in kind [9],[15],[24],[29] 13.80%  
Investment, Identifier [Axis]: Adhefin International, Industrial Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[28] $ 300  
Fair value at ending balance [2],[3],[4],[28]   $ 300
Interest [2],[3],[4],[28]   10.50%
Investment, interest rate, paid in kind [2],[3],[4],[28]   14.40%
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]    
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 2,248.46  
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 [4],[18] $ 697  
Fair value at ending balance [4],[18]   $ 697
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   8,717.76
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 ending balance [15],[17] $ 561  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 8,717.76  
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A1 Partnership Units Class A2 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 145  
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A1 Partnership Units Class B1 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] 0  
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Advertising, Printing & Publishing, Class A1 Partnership Units Class B2 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] 0  
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 [4],[18] $ 180  
Fair value at ending balance [4],[18]   $ 180
Investment owned, balance (in shares) 2,248.46 [5],[7],[8],[15],[17] 2,248.46 [4],[10],[12],[13],[18]
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 [4],[18] $ 0  
Fair value at ending balance [4],[18]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   8,717.76
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]    
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 8,717.76  
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 [4],[18] $ 0  
Fair value at ending balance [4],[18]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   2,248.46
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 3,587  
Fair value at ending balance   $ 3,587
Interest   9.00%
Investment, Identifier [Axis]: Air Canada 2020-2 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 $ 3,014  
Interest 9.00%  
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 7,633  
Fair value at ending balance [1],[2],[4]   $ 7,633
Interest [1],[2],[4]   5.00%
Interest [1],[2],[4]   10.30%
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 7,606  
Interest [15],[23],[24] 5.00%  
Interest [15],[23],[24] 9.60%  
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 1,283  
Interest [15],[23],[24] 6.25%  
Interest [15],[23],[24] 11.90%  
Investment, Identifier [Axis]: Air Comm Corporation, LLC, Aerospace & Defense, First Lien Senior Secured Term Loan, 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 1,296  
Fair value at ending balance [1],[2],[4]   $ 1,296
Interest [1],[2],[4]   6.25%
Interest [1],[2],[4]   11.70%
Investment, Identifier [Axis]: AirX Climate Solutions, Inc,Diversified Manufacturing, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 3,226  
Fair value at ending balance [1],[2],[4],[11]   $ 3,226
Interest [1],[2],[4],[11]   6.25%
Interest [1],[2],[4],[11]   11.70%
Investment, Identifier [Axis]: AirX Climate Solutions, Inc,Diversified Manufacturing,Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] (12)  
Fair value at ending balance [1],[2],[4],[11]   $ (12)
Interest [1],[2],[4],[11]   6.25%
Interest [1],[2],[4],[11]   11.70%
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., Diversified Manufacturing, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 2,710  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 10.20%  
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., 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 [6],[15],[23],[24] $ (37)  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 11.00%  
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., 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 [6],[15],[23],[24] $ 3,304  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 11.00%  
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., Diversified Manufacturing, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 0  
Interest [6],[15],[24],[32] 5.75%  
Interest [6],[15],[24],[32] 11.00%  
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 beginning balance [2],[3],[4],[11],[28] $ 3,443  
Fair value at ending balance $ 4,588 [6],[9],[15],[24],[34] $ 3,443 [2],[3],[4],[11],[28]
Interest 5.75% [6],[9],[15],[24],[34] 6.25% [2],[3],[4],[11],[28]
Interest 8.90% [6],[9],[15],[24],[34] 10.20% [2],[3],[4],[11],[28]
Investment, Identifier [Axis]: Alpine SG, LLC, High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[16] $ 22,792  
Fair value at ending balance $ 23,024 [14],[15],[23],[24] $ 22,792 [1],[2],[4],[16]
Interest 6.00% [14],[15],[23],[24] 6.00% [1],[2],[4],[16]
Interest 11.90% [14],[15],[23],[24] 11.50% [1],[2],[4],[16]
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 [3],[4],[18] $ 1,188  
Fair value at ending balance $ 1,327 [9],[15],[17] $ 1,188 [3],[4],[18]
Investment owned, balance (in shares) 98,906,608 [5],[7],[8],[9],[15],[17] 93,165,208 [3],[4],[10],[12],[13],[18]
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15] $ 310  
Interest [9],[15] 15.50%  
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 [3],[4] $ 4,824  
Fair value at ending balance $ 5,536 [9],[15] $ 4,824 [3],[4]
Interest 2.00% [9],[15] 2.00% [3],[4]
Investment, interest rate, paid in kind 9.00% [9],[15] 9.00% [3],[4]
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrant    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[18] $ 529  
Fair value at ending balance [3],[4],[18]   $ 529
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   380,385
Investment, Identifier [Axis]: Amalfi Midco, Healthcare, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[17] $ 811  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 380,385  
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Chemicals, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 113  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 88,110  
Investment, Identifier [Axis]: Americo Chemical 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 [15],[24],[32] $ 1,706  
Interest [15],[24],[32] 5.25%  
Interest [15],[24],[32] 10.10%  
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Chemicals, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 0  
Interest [6],[15],[24],[32] 5.25%  
Interest [6],[15],[24],[32] 10.10%  
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 89  
Fair value at ending balance [4],[18]   $ 89
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   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 beginning balance [2],[4],[27] 1,920  
Fair value at ending balance [2],[4],[27]   $ 1,920
Interest [2],[4],[27]   5.50%
Interest [2],[4],[27]   10.90%
Investment, Identifier [Axis]: Americo Chemicals Products, LLC, Chemicals, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] (4)  
Fair value at ending balance [2],[4],[11],[27]   $ (4)
Interest [2],[4],[11],[27]   5.50%
Interest [2],[4],[11],[27]   10.90%
Investment, Identifier [Axis]: Amtech LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 2,988  
Fair value at ending balance [1],[2],[4]   $ 2,988
Interest [1],[2],[4]   5.50%
Interest [1],[2],[4]   11.40%
Investment, Identifier [Axis]: Amtech LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 242  
Fair value at ending balance [1],[2],[4],[11]   $ 242
Interest [1],[2],[4],[11]   5.50%
Interest [1],[2],[4],[11]   11.40%
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 [2],[3],[4],[28] 3,173  
Fair value at ending balance $ 3,219 [9],[15],[24],[29] $ 3,173 [2],[3],[4],[28]
Interest 6.00% [9],[15],[24],[29] 6.25% [2],[3],[4],[28]
Interest 9.60% [9],[15],[24],[29] 10.20% [2],[3],[4],[28]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[28] $ 958  
Fair value at ending balance $ 972 [9],[15],[24],[29] $ 958 [2],[3],[4],[28]
Interest 6.00% [9],[15],[24],[29] 6.25% [2],[3],[4],[28]
Interest 9.60% [9],[15],[24],[29] 10.20% [2],[3],[4],[28]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[28] $ 1,678  
Fair value at ending balance $ 1,705 [9],[15],[24],[29] $ 1,678 [2],[3],[4],[28]
Interest 7.00% [9],[15],[24],[29] 7.00% [2],[3],[4],[28]
Interest 10.70% [9],[15],[24],[29] 11.00% [2],[3],[4],[28]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, Chemicals, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 1,002  
Fair value at ending balance $ 1,006 [9],[15],[23],[24] $ 1,002 [1],[2],[3],[4]
Interest 6.25% [9],[15],[23],[24] 6.25% [1],[2],[3],[4]
Interest 12.00% [9],[15],[23],[24] 11.90% [1],[2],[3],[4]
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 [2],[4],[35] $ 9,404  
Fair value at ending balance [2],[4],[35]   $ 9,404
Investment, interest rate, paid in kind [2],[4],[35]   8.00%
Investment, Identifier [Axis]: Anju Software, Inc. Application Software, Super Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11] 817  
Fair value at ending balance [2],[4],[11]   $ 817
Investment, interest rate, paid in kind [2],[4],[11]   10.00%
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 [2],[3],[4],[36] 1,858  
Fair value at ending balance $ 1,947 [9],[15],[24],[37] $ 1,858 [2],[3],[4],[36]
Interest 6.25% [9],[15],[24],[37] 5.75% [2],[3],[4],[36]
Interest 11.30% [9],[15],[24],[37] 11.10% [2],[3],[4],[36]
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[37] $ 1,473  
Interest [9],[15],[24],[37] 6.25%  
Interest [9],[15],[24],[37] 11.30%  
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, First Lien Senior Secured Term Loan1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[36] $ 1,358  
Fair value at ending balance [2],[3],[4],[36]   $ 1,358
Interest [2],[3],[4],[36]   6.50%
Interest [2],[3],[4],[36]   11.70%
Investment, Identifier [Axis]: Apex Bidco Limited, Business Equipment & Services, Subordinated Senior Unsecured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4] 285  
Fair value at ending balance $ 321 [9],[15] $ 285 [3],[4]
Investment, interest rate, paid in kind 8.00% [9],[15] 8.00% [3],[4]
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 [3],[16] $ 5,885  
Fair value at ending balance 3,953 [9],[14] $ 5,885 [3],[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 [3],[4],[18] 0  
Fair value at ending balance [3],[4],[18]   $ 0
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   48
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 ending balance [9],[15],[17] $ 16  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 48  
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 [2],[3],[4],[38] $ 1,982  
Fair value at ending balance $ 2,043 [9],[15],[24],[34] $ 1,982 [2],[3],[4],[38]
Interest 6.00% [9],[15],[24],[34] 6.50% [2],[3],[4],[38]
Interest 8.40% [9],[15],[24],[34] 10.40% [2],[3],[4],[38]
Investment, interest rate, paid in kind 1.50% [9],[15],[24],[34] 1.50% [2],[3],[4],[38]
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 [3],[4],[18] $ 4  
Fair value at ending balance [3],[4],[18]   $ 4
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   13
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 ending balance [9],[15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 13  
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 [2],[3],[4],[36] $ 3,621  
Fair value at ending balance $ 3,864 [9],[15],[24],[39] $ 3,621 [2],[3],[4],[36]
Interest 5.50% [9],[15],[24],[39] 5.50% [2],[3],[4],[36]
Interest 10.70% [9],[15],[24],[39] 10.70% [2],[3],[4],[36]
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 [2],[3],[4],[11],[40] $ 5,839  
Fair value at ending balance $ 6,426 [6],[9],[15],[24],[39] $ 5,839 [2],[3],[4],[11],[40]
Interest 6.00% [6],[9],[15],[24],[39] 6.00% [2],[3],[4],[11],[40]
Interest 11.20% [6],[9],[15],[24],[39] 11.20% [2],[3],[4],[11],[40]
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 [2],[3],[4],[40] $ 1,706  
Fair value at ending balance [2],[3],[4],[40]   $ 1,706
Interest [2],[3],[4],[40]   10.50%
Investment, interest rate, paid in kind [2],[3],[4],[40]   15.70%
Investment, Identifier [Axis]: Arc Education, Consumer Cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[28] 3,791  
Fair value at ending balance $ 3,865 [6],[9],[15],[24],[29] $ 3,791 [2],[3],[4],[11],[28]
Interest 5.75% [6],[9],[15],[24],[29] 5.75% [2],[3],[4],[11],[28]
Interest 9.10% [6],[9],[15],[24],[29] 9.70% [2],[3],[4],[11],[28]
Investment, Identifier [Axis]: Arch Global Precision LLC, Industrial Machinery, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 8,993  
Fair value at ending balance $ 8,720 [15],[23],[24] $ 8,993 [1],[2],[4]
Interest 4.75% [15],[23],[24] 4.75% [1],[2],[4]
Interest 9.40% [15],[23],[24] 10.20% [1],[2],[4]
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 [2],[3],[4],[28] $ 6,304  
Fair value at ending balance $ 6,170 [9],[15],[24],[29] $ 6,304 [2],[3],[4],[28]
Interest 6.50% [9],[15],[24],[29] 6.50% [2],[3],[4],[28]
Interest 9.80% [9],[15],[24],[29] 10.40% [2],[3],[4],[28]
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[18] $ 0  
Fair value at ending balance $ 0 [9],[15],[17] $ 0 [3],[4],[18]
Investment owned, balance (in shares) 464 [5],[7],[8],[9],[15],[17] 464 [3],[4],[10],[12],[13],[18]
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 [3],[4] $ 42  
Fair value at ending balance [3],[4]   $ 42
Investment owned, balance (in shares) [3],[4],[10],[12],[13]   41,560
Investment, interest rate, paid in kind [3],[4]   10.00%
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 ending balance [9],[15] $ 40  
Investment owned, balance (in shares) [5],[7],[8],[9],[15] 41,560  
Investment, interest rate, paid in kind [9],[15] 10.00%  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 1,905  
Interest [9],[15],[24],[29] 4.00%  
Interest [9],[15],[24],[29] 7.70%  
Investment, interest rate, paid in kind [9],[15],[24],[29] 3.40%  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 125  
Fair value at ending balance $ 127 [9],[15],[23],[24] $ 125 [1],[2],[3],[4]
Interest 4.00% [9],[15],[23],[24] 4.00% [1],[2],[3],[4]
Interest 9.30% [9],[15],[23],[24] 9.30% [1],[2],[3],[4]
Investment, interest rate, paid in kind [9],[15],[23],[24] 3.40%  
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 [2],[3],[4],[28] $ 307  
Fair value at ending balance $ 1,698 [6],[9],[15],[24],[37] $ 307 [2],[3],[4],[28]
Interest 4.00% [6],[9],[15],[24],[37] 4.00% [2],[3],[4],[28]
Interest 8.90% [6],[9],[15],[24],[37] 7.60% [2],[3],[4],[28]
Investment, interest rate, paid in kind 3.40% [6],[9],[15],[24],[37] 3.30% [2],[3],[4],[28]
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 [2],[3],[4],[28] $ 1,408  
Fair value at ending balance [2],[3],[4],[28]   $ 1,408
Interest [2],[3],[4],[28]   6.75%
Interest [2],[3],[4],[28]   10.70%
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 beginning balance [2],[3],[4],[36] 1,632  
Fair value at ending balance [2],[3],[4],[36]   $ 1,632
Interest [2],[3],[4],[36]   4.00%
Interest [2],[3],[4],[36]   8.90%
Investment, interest rate, paid in kind [2],[3],[4],[36]   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 beginning balance [2],[3],[4],[11],[36] (28)  
Fair value at ending balance [2],[3],[4],[11],[36]   $ (28)
Interest [2],[3],[4],[11],[36]   6.50%
Interest [2],[3],[4],[11],[36]   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 [3],[4] 42  
Fair value at ending balance [3],[4]   $ 42
Investment owned, balance (in shares) [3],[4],[10],[12],[13]   41,560
Investment, interest rate, paid in kind [3],[4]   10.00%
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 ending balance [9],[15] $ 40  
Investment owned, balance (in shares) [5],[7],[8],[9],[15] 41,560  
Investment, interest rate, paid in kind [9],[15] 10.00%  
Investment, Identifier [Axis]: Argus Bidco Limited, High Tech Industries, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15] $ 789  
Investment, interest rate, paid in kind [9],[15] 10.50%  
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 beginning balance [3],[4] $ 734  
Fair value at ending balance [3],[4]   $ 734
Investment, interest rate, paid in kind [3],[4]   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],[2],[4] 3,790  
Fair value at ending balance [1],[2],[4]   $ 3,790
Interest [1],[2],[4]   5.50%
Interest [1],[2],[4]   10.90%
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC ), Air Freight & Logistics, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 4,709  
Fair value at ending balance [1],[2],[4]   $ 4,709
Interest [1],[2],[4]   5.50%
Interest [1],[2],[4]   10.90%
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC), Air Freight & Logistics, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 2,546  
Interest [15],[23],[24] 5.50%  
Interest [15],[23],[24] 10.80%  
Investment, interest rate, paid in kind [15],[23],[24] 0.50%  
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 ending balance [15],[23],[24] $ 3,172  
Interest [15],[23],[24] 5.50%  
Interest [15],[23],[24] 10.80%  
Investment, interest rate, paid in kind [15],[23],[24] 0.50%  
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 [2],[3],[4],[11],[36] $ 2,380  
Fair value at ending balance $ 2,596 [6],[9],[15],[24],[37] $ 2,380 [2],[3],[4],[11],[36]
Interest 5.50% [6],[9],[15],[24],[37] 5.25% [2],[3],[4],[11],[36]
Interest 10.50% [6],[9],[15],[24],[37] 10.40% [2],[3],[4],[11],[36]
Investment, Identifier [Axis]: Astra Bidco Limited, Healthcare, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ 239  
Interest [6],[9],[15],[24],[29] 5.25%  
Interest [6],[9],[15],[24],[29] 8.80%  
Investment, Identifier [Axis]: Astra Bidco Limited, Healthcare, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 85  
Interest [9],[15],[24],[29] 5.25%  
Interest [9],[15],[24],[29] 8.80%  
Investment, Identifier [Axis]: Auxi International, Commercial Finance, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34] $ 1,466  
Interest [9],[15],[24],[34] 7.25%  
Interest [9],[15],[24],[34] 10.40%  
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 [2],[3],[4],[38] $ 1,427  
Fair value at ending balance $ 843 [9],[15],[24],[39] $ 1,427 [2],[3],[4],[38]
Interest 6.25% [9],[15],[24],[39] 7.25% [2],[3],[4],[38]
Interest 11.20% [9],[15],[24],[39] 11.30% [2],[3],[4],[38]
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 [2],[3],[4],[40] $ 788  
Fair value at ending balance [2],[3],[4],[40]   $ 788
Interest [2],[3],[4],[40]   7.25%
Interest [2],[3],[4],[40]   12.40%
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 [2],[3],[4],[11],[41] 2,190  
Fair value at ending balance $ 2,199 [6],[9],[15],[24],[42] $ 2,190 [2],[3],[4],[11],[41]
Interest 4.50% [6],[9],[15],[24],[42] 5.00% [2],[3],[4],[11],[41]
Interest 8.90% [6],[9],[15],[24],[42] 9.40% [2],[3],[4],[11],[41]
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 [2],[4],[16],[27] $ 29,162  
Fair value at ending balance [2],[4],[16],[27]   $ 29,162
Interest [2],[4],[16],[27]   8.50%
Interest [2],[4],[16],[27]   14.00%
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 [4],[18] 288  
Fair value at ending balance [4],[18]   $ 288
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   192,307.7
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 254  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 192,307.7  
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 4,809  
Fair value at ending balance $ 4,796 [6],[15],[23],[24] $ 4,809 [1],[2],[4],[11]
Interest 5.25% [6],[15],[23],[24] 5.25% [1],[2],[4],[11]
Interest 10.20% [6],[15],[23],[24] 10.70% [1],[2],[4],[11]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (3)  
Fair value at ending balance $ 0 [6],[15],[23],[24] $ (3) [1],[2],[4],[11]
Interest 5.25% [6],[15],[23],[24] 5.25% [1],[2],[4],[11]
Interest 10.20% [6],[15],[23],[24] 10.70% [1],[2],[4],[11]
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 [4] $ 1,529  
Fair value at ending balance $ 1,749 [15] $ 1,529 [4]
Investment, interest rate, paid in kind 12.00% [15] 12.00% [4]
Investment, Identifier [Axis]: BKF Buyer, Inc., Construction and Building, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 1,004  
Investment owned, balance (in shares) [5],[7],[8],[15] 1,004,467  
Investment, Identifier [Axis]: BKF 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 ending balance [15],[24],[32] $ 8,015  
Interest [15],[24],[32] 5.21%  
Interest [15],[24],[32] 10.00%  
Investment, Identifier [Axis]: BKF Buyer, Inc., Construction and Building, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24],[32] $ (59)  
Interest [15],[24],[32] 5.21%  
Interest [15],[24],[32] 10.00%  
Investment, Identifier [Axis]: BNI Global, LLC, Other Industrial, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24],[43] $ 10,008  
Interest [15],[24],[43] 5.50%  
Interest [15],[24],[43] 8.90%  
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 beginning balance [1],[2],[4] $ 13,401  
Fair value at ending balance [1],[2],[4]   $ 13,401
Interest [1],[2],[4]   6.00%
Interest [1],[2],[4]   11.40%
Investment, Identifier [Axis]: BPG Holdings IV Corp, Diversified Manufacturing, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 12,978  
Interest [15],[23],[24] 6.00%  
Interest [15],[23],[24] 11.60%  
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 [2],[4],[28] $ 9,541  
Fair value at ending balance $ 10,395 [15],[24],[29] $ 9,541 [2],[4],[28]
Interest 9.50% [15],[24],[29] 9.50% [2],[4],[28]
Interest 12.80% [15],[24],[29] 13.40% [2],[4],[28]
Investment, Identifier [Axis]: Bariacum S.A, Consumer Products, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[38] $ 3,314  
Fair value at ending balance $ 3,348 [9],[15],[24],[34] $ 3,314 [2],[3],[4],[38]
Interest 4.75% [9],[15],[24],[34] 4.75% [2],[3],[4],[38]
Interest 8.40% [9],[15],[24],[34] 8.60% [2],[3],[4],[38]
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 [2],[3],[4],[44] $ 1,096  
Fair value at ending balance $ 931 [9],[15],[24],[45] $ 1,096 [2],[3],[4],[44]
Interest 5.25% [9],[15],[24],[45] 5.25% [2],[3],[4],[44]
Interest 8.40% [9],[15],[24],[45] 9.30% [2],[3],[4],[44]
Investment, Identifier [Axis]: Beyond Risk Management, Inc., Other Financial, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 2,944  
Fair value at ending balance $ 5,176 [6],[15],[23],[24] $ 2,944 [1],[2],[4],[11]
Interest 4.50% [6],[15],[23],[24] 4.50% [1],[2],[4],[11]
Interest 9.90% [6],[15],[23],[24] 10.00% [1],[2],[4],[11]
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 [2],[3],[4],[38] $ 7,672  
Fair value at ending balance $ 7,621 [9],[15],[24],[34] $ 7,672 [2],[3],[4],[38]
Interest 6.50% [9],[15],[24],[34] 6.50% [2],[3],[4],[38]
Interest 10.20% [9],[15],[24],[34] 10.50% [2],[3],[4],[38]
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[25] $ 2,020  
Fair value at ending balance [2],[3],[4],[25]   $ 2,020
Interest [2],[3],[4],[25]   5.50%
Interest [2],[3],[4],[25]   10.80%
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] 353  
Fair value at ending balance [1],[2],[3],[4]   $ 353
Interest [1],[2],[3],[4]   5.75%
Interest [1],[2],[3],[4]   11.10%
Investment, Identifier [Axis]: BigHand UK Bidco Limited, High Tech Industries, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[36] 801  
Fair value at ending balance [2],[3],[4],[36]   $ 801
Interest [2],[3],[4],[36]   5.75%
Interest [2],[3],[4],[36]   11.10%
Investment, Identifier [Axis]: Biolam Group, Consumer Non-cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[28] 2,266  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 2,266
Interest [2],[3],[4],[11],[28]   4.25%
Interest [2],[3],[4],[11],[28]   5.50%
Investment, interest rate, paid in kind [2],[3],[4],[11],[28]   2.80%
Investment, Identifier [Axis]: Biolam Group, ConsumerNon-cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[34],[46] $ 1,656  
Interest [6],[9],[15],[24],[34],[46] 4.25%  
Interest [6],[9],[15],[24],[34],[46] 5.50%  
Investment, interest rate, paid in kind [6],[9],[15],[24],[34],[46] 2.80%  
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [47] $ 7,166 $ 5,647
Gross Additions [47],[48] 926 1,330
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 0 189
Fair value at ending balance [47] 8,092 7,166
Amount of Interest or Dividends Credited to Income [47],[50] $ 837 $ 1,401
Interest 14.40% 14.40%
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 [47] $ 4,869 $ 9,147
Gross Additions [47],[48] 0 0
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] (3,488) (4,278)
Fair value at ending balance [47] 1,381 4,869
Amount of Interest or Dividends Credited to Income [47],[50] $ 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    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [14],[15],[46] $ 1,381  
Investment, interest rate, paid in kind [14],[15],[46] 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 [2],[4],[16],[27] $ 7,166  
Fair value at ending balance $ 8,092 [14],[15] $ 7,166 [2],[4],[16],[27]
Investment, interest rate, paid in kind 14.40% [14],[15] 14.40% [2],[4],[16],[27]
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 [4],[16],[35] $ 4,869  
Fair value at ending balance [4],[16],[35]   $ 4,869
Investment, interest rate, paid in kind [4],[16],[35]   10.00%
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 [4],[16],[18] 0  
Fair value at ending balance [4],[16],[18]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[16],[18]   44.6
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 ending balance [14],[15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 44.6  
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 [47] $ 0 $ 0
Gross Additions [47],[48] 0 0
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 0 0
Fair value at ending balance [47] 0 0
Amount of Interest or Dividends Credited to Income [47],[50] $ 0 $ 0
Investment owned, balance (in shares) 44.6 44.6
Investment, Identifier [Axis]: Bounteous, Inc., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 1,605  
Fair value at ending balance $ 4,116 [15],[23],[24] $ 1,605 [1],[2],[4],[11]
Interest 4.75% [15],[23],[24] 5.25% [1],[2],[4],[11]
Interest 9.90% [15],[23],[24] 10.70% [1],[2],[4],[11]
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Municipal Revenue Bond    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 28,802  
Fair value at ending balance $ 28,347 [15] $ 28,802
Interest 11.50% [15] 11.50%
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Preferred Stock- Series A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4] $ 15,003  
Fair value at ending balance [4]   $ 15,003
Investment owned, balance (in shares) [4],[10],[12],[13]   14,618
Investment, interest rate, paid in kind [4]   7.00%
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Environmental Industries, Preferred Stock- Series A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance $ 14,431  
Investment owned, balance (in shares) [5],[7],[8] 14,618  
Investment, interest rate, paid in kind 7.00%  
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,540  
Fair value at ending balance $ 4,669 [15],[24],[32] $ 4,540 [1],[2],[4]
Interest 5.75% [15],[24],[32] 5.75% [1],[2],[4]
Interest 10.40% [15],[24],[32] 11.20% [1],[2],[4]
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 [4],[18] $ 930  
Fair value at ending balance [4],[18]   $ 930
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   1,107,492.71
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, LLC units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 1,174  
Investment owned, balance (in shares) [5],[7],[8],[15] 1,107,492.71  
Investment, Identifier [Axis]: BrightSign LLC, Media & Entertainment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 839  
Fair value at ending balance $ 1,019 [6],[15],[24],[32] $ 839 [1],[2],[4],[11]
Interest 5.75% [6],[15],[24],[32] 5.75% [1],[2],[4],[11]
Interest 10.40% [6],[15],[24],[32] 11.20% [1],[2],[4],[11]
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 [4] $ 4,750  
Fair value at ending balance [4]   $ 4,750
Interest [4]   8.00%
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 [2],[3],[4],[11],[28] 2,250  
Fair value at ending balance $ 2,284 [6],[9],[15],[24],[34] $ 2,250 [2],[3],[4],[11],[28]
Interest 5.00% [6],[9],[15],[24],[34] 5.00% [2],[3],[4],[11],[28]
Interest 8.60% [6],[9],[15],[24],[34] 9.00% [2],[3],[4],[11],[28]
Investment, Identifier [Axis]: British Airways 2020-1 Class B Pass Through Trust, Airlines, Structured Secured Note - Class B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 610  
Fair value at ending balance   $ 610
Interest   8.40%
Investment, Identifier [Axis]: British Airways 2020-1 Class B Pass Through Trust, Structured Products, First Lien Senior Secured Bond    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance $ 539  
Interest 8.40%  
Investment, Identifier [Axis]: British Engineering Services Holdco Limited, Commercial Services & Supplies, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[40] $ 14,403  
Fair value at ending balance $ 15,670 [9],[15],[24],[39] $ 14,403 [2],[3],[4],[40]
Interest 6.75% [9],[15],[24],[39] 7.00% [2],[3],[4],[40]
Interest 12.70% [9],[15],[24],[39] 11.90% [2],[3],[4],[40]
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],[2],[4],[16] $ 2,596  
Fair value at ending balance $ 2,542 [14],[23],[24] $ 2,596 [1],[2],[4],[16]
Interest 4.00% [14],[23],[24] 4.00% [1],[2],[4],[16]
Interest 9.20% [14],[23],[24] 9.50% [1],[2],[4],[16]
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 [2],[4],[27] $ 5,954  
Fair value at ending balance $ 5,747 [15],[23],[24] $ 5,954 [2],[4],[27]
Interest 6.00% [15],[23],[24] 5.75% [2],[4],[27]
Interest 10.90% [15],[23],[24] 11.20% [2],[4],[27]
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 [4],[18] $ 462  
Fair value at ending balance $ 441 [15],[17] $ 462 [4],[18]
Investment owned, balance (in shares) 455 [5],[7],[8],[15],[17] 455 [4],[10],[12],[13],[18]
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 [2],[4],[27] $ 4,368  
Fair value at ending balance $ 4,545 [15],[24],[33] $ 4,368 [2],[4],[27]
Interest 9.00% [15],[24],[33] 9.00% [2],[4],[27]
Interest 14.20% [15],[24],[33] 14.40% [2],[4],[27]
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 11,032  
Interest [15],[23],[24] 5.25%  
Interest [15],[23],[24] 10.10%  
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,636  
Fair value at ending balance $ 1,331 [15],[23],[24] $ 4,636 [1],[2],[4]
Interest 5.25% [15],[23],[24] 6.25% [1],[2],[4]
Interest 10.10% [15],[23],[24] 11.90% [1],[2],[4]
Investment, Identifier [Axis]: CAi Software, LLC, Technology, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 1,275  
Fair value at ending balance [1],[2],[4]   $ 1,275
Interest [1],[2],[4]   6.25%
Interest [1],[2],[4]   11.90%
Investment, Identifier [Axis]: CAi Software, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] (61)  
Fair value at ending balance $ 1,222 [6],[15],[23],[24] $ (61) [1],[2],[4],[11]
Interest 5.25% [6],[15],[23],[24] 6.25% [1],[2],[4],[11]
Interest 10.10% [6],[15],[23],[24] 11.90% [1],[2],[4],[11]
Investment, Identifier [Axis]: CCFF Buyer, LLC, Food & Beverage, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 3,766  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 10.80%  
Investment, Identifier [Axis]: CCFF Buyer, LLC, Food & Beverage, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 287  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 233  
Investment, Identifier [Axis]: CCFF Buyer, LLC, Food & Beverage, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (10)  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 10.80%  
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 12,822  
Interest [15],[23],[24] 4.50%  
Interest [15],[23],[24] 9.40%  
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 12,968  
Fair value at ending balance $ 1,361 [15],[23],[24] $ 12,968 [1],[2],[4]
Interest 4.50% [15],[23],[24] 5.75% [1],[2],[4]
Interest 9.40% [15],[23],[24] 11.30% [1],[2],[4]
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 1,344  
Fair value at ending balance [1],[2],[4]   $ 1,344
Interest [1],[2],[4]   5.75%
Interest [1],[2],[4]   11.30%
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 [4],[18] 1,190  
Fair value at ending balance [4],[18]   $ 1,190
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   657
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 ending balance [15],[17] $ 1,546  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 657  
Investment, Identifier [Axis]: CGI Parent, LLC, Business Equipment & Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (33)  
Fair value at ending balance $ 0 [6],[15],[23],[24] $ (33) [1],[2],[4],[11]
Interest 4.50% [6],[15],[23],[24] 5.75% [1],[2],[4],[11]
Interest 9.40% [6],[15],[23],[24] 11.30% [1],[2],[4],[11]
Investment, Identifier [Axis]: CM Acquisitions Holdings Inc., Internet & Direct Marketing, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 9,777  
Interest [15],[23],[24] 6.00%  
Interest [15],[23],[24] 8.20%  
Investment, interest rate, paid in kind 2.50%  
Investment, Identifier [Axis]: CM Acquisitions Holdings Inc., Internet & Direct Marketing, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 13,399  
Fair value at ending balance $ 3,641 [15],[23],[24] $ 13,399 [1],[2],[4]
Interest 6.00% [15],[23],[24] 5.00% [1],[2],[4]
Interest 8.20% [15],[23],[24] 10.20% [1],[2],[4]
Investment, interest rate, paid in kind [15],[23],[24] 2.50%  
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 [2],[4],[27] $ 3,742  
Fair value at ending balance $ 3,797 [15],[23],[24] $ 3,742 [2],[4],[27]
Interest 5.00% [15],[23],[24] 5.00% [2],[4],[27]
Interest 10.10% [15],[23],[24] 10.40% [2],[4],[27]
Investment, interest rate, paid in kind 0.30% [15],[23],[24] 0.30% [2],[4],[27]
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 beginning balance [2],[4],[27] $ 609  
Fair value at ending balance [2],[4],[27]   $ 609
Interest [2],[4],[27]   5.00%
Interest [2],[4],[27]   10.40%
Investment, interest rate, paid in kind [2],[4],[27]   0.30%
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), Distributors, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] 59  
Fair value at ending balance [4],[18]   $ 59
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   12,635
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 ending balance [15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 12,635  
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 [2],[3],[4],[11],[51] $ 2,052  
Fair value at ending balance $ 2,159 [6],[9],[15],[24],[52] $ 2,052 [2],[3],[4],[11],[51]
Interest 4.75% [6],[9],[15],[24],[52] 5.25% [2],[3],[4],[11],[51]
Interest 9.70% [6],[9],[15],[24],[52] 10.50% [2],[3],[4],[11],[51]
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 [2],[16],[27] $ 4,684  
Fair value at ending balance [2],[16],[27]   $ 4,684
Interest [2],[16],[27]   4.25%
Interest [2],[16],[27]   9.70%
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, 2024 LIFO Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 4,051  
Interest [15],[23],[24] 10.00%  
Investment, interest rate, paid in kind [15],[23],[24] 15.30%  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 581  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 19,376  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, First Out Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 2,758  
Interest [15],[23],[24] 10.00%  
Investment, interest rate, paid in kind [15],[23],[24] 15.30%  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Food & Beverage, Second Out Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 576  
Interest [15],[23],[24] 12.00%  
Investment, interest rate, paid in kind [15],[23],[24] 17.30%  
Investment, Identifier [Axis]: CW Group Holdings, LLC, High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 2,759  
Fair value at ending balance $ 2,739 [15],[23],[24] $ 2,759 [1],[2],[4]
Interest 5.50% [15],[23],[24] 6.00% [1],[2],[4]
Interest 10.30% [15],[23],[24] 11.40% [1],[2],[4]
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 [4],[18] $ 289  
Fair value at ending balance [4],[18]   $ 289
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   161,290.32
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 ending balance [15] $ 303  
Investment owned, balance (in shares) [5],[7],[8],[15] 161,290.32  
Investment, Identifier [Axis]: Caldwell & Gregory LLC, Services: Business, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 18,413  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 9.60%  
Investment, Identifier [Axis]: Caldwell & Gregory LLC, Services: Business, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (38)  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 9.60%  
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 [3],[4],[18] $ 0  
Fair value at ending balance $ 0 [9],[15],[17] $ 0 [3],[4],[18]
Investment owned, balance (in shares) 500,000 [5],[7],[8],[9],[15],[17] 500,000 [3],[4],[10],[12],[13],[18]
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 [3],[4],[18] $ 0  
Fair value at ending balance $ 0 [9],[15],[17] $ 0 [3],[4],[18]
Investment owned, balance (in shares) 74,712.64 [5],[7],[8],[9],[15],[17] 257,127.45 [3],[4],[10],[12],[13],[18]
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Class X Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 45,604  
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[9],[15] 14.37  
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 [2],[3],[4],[53] $ 1,322  
Fair value at ending balance $ 332 [9],[15],[24],[46],[54] $ 1,322 [2],[3],[4],[53]
Interest 7.00% [9],[15],[24],[46],[54] 3.50% [2],[3],[4],[53]
Interest [2],[3],[4],[53]   9.00%
Investment, interest rate, paid in kind 11.80% [9],[15],[24],[46],[54] 3.50% [2],[3],[4],[53]
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Healthcare, Super Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15] $ 157  
Investment, interest rate, paid in kind [6],[9],[15] 15.00%  
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[17] $ 770  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 681,818  
Investment, Identifier [Axis]: Caribou Holding Company, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 4,240  
Fair value at ending balance $ 4,266 [9],[15],[23],[24] $ 4,240 [1],[2],[3],[4]
Interest 7.64% [9],[15],[23],[24] 7.64% [1],[2],[3],[4]
Interest 13.10% [9],[15],[23],[24] 14.00% [1],[2],[3],[4]
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 [3],[4],[18] $ 982  
Fair value at ending balance [3],[4],[18]   $ 982
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   681,818
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 beginning balance [3],[4],[18] 0  
Fair value at ending balance [3],[4],[18]   $ 0
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   45,604
Investment, Identifier [Axis]: Cascade Residential Services LLC, Electric, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 3,941  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.80%  
Investment, Identifier [Axis]: Cascade Residential Services LLC, Electric, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (8)  
Fair value at ending balance $ 61 [6],[15],[23],[24] $ (8) [1],[2],[4],[11]
Interest 5.50% [6],[15],[23],[24] 10.40% [1],[2],[4],[11]
Interest 10.80% [6],[15],[23],[24] 5.00% [1],[2],[4],[11]
Investment, Identifier [Axis]: Cascade Residential Services LLC,Electric,First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 2,567  
Fair value at ending balance [1],[2],[4],[11]   $ 2,567
Interest [1],[2],[4],[11]   5.00%
Interest [1],[2],[4],[11]   10.40%
Investment, Identifier [Axis]: Catawba River Limited, Finance Companies, Structured - Junior Note    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[11] 943  
Fair value at ending balance 2,977 [9],[15] $ 943 [3],[4],[11]
Investment, Identifier [Axis]: Celebration Bidco, LLC, Chemicals, Plastics, & Rubber, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 12,692  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 1,243,071  
Investment, Identifier [Axis]: Celebration Bidco, LLC, Chemicals, Plastics, & Rubber, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[4] $ 6,214  
Fair value at ending balance $ 6,214 [15],[23] $ 6,214 [1],[4]
Interest 8.00% [15],[23] 8.00% [1],[4]
Interest 12.60% [15],[23] 13.30% [1],[4]
Investment, Identifier [Axis]: Celebration Bidco, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] $ 12,177 $ 0
Gross Additions [19],[20] 0 12,177
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] 515 0
Fair value at ending balance [19] 12,692 12,177
Amount of Interest or Dividends Credited to Income [19],[22] $ 0 $ 0
Investment owned, balance (in shares) 1,243,071 1,243,071
Investment, Identifier [Axis]: Celebration Bidco, LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] $ 6,214 $ 0
Gross Additions [19],[20] 0 6,214
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] 0 0
Fair value at ending balance [19] 6,214 6,214
Amount of Interest or Dividends Credited to Income [19],[22] $ 637 $ 0
Interest 8.00% 8.00%
Interest 13.30% 13.30%
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., Diversified Financial Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 3,177  
Interest [9],[15],[24],[29] 5.25%  
Interest [9],[15],[24],[29] 8.80%  
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 [2],[3],[4],[28] $ 3,144  
Fair value at ending balance [2],[3],[4],[28]   $ 3,144
Interest [2],[3],[4],[28]   5.25%
Interest [2],[3],[4],[28]   9.20%
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 [2],[3],[4],[38] 3,307  
Fair value at ending balance [2],[3],[4],[38]   $ 3,307
Interest [2],[3],[4],[38]   6.00%
Interest [2],[3],[4],[38]   10.10%
Investment, Identifier [Axis]: Ceres Pharma NV, Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34] $ 3,379  
Interest [9],[15],[24],[34] 6.00%  
Interest [9],[15],[24],[34] 9.80%  
Investment, Identifier [Axis]: Classic Collision (Summit Buyer, LLC), Auto Collision Repair Centers, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 6,602  
Fair value at ending balance [1],[2],[4],[11]   $ 6,602
Interest [1],[2],[4],[11]   5.75%
Interest [1],[2],[4],[11]   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],[2],[4] 599  
Fair value at ending balance [1],[2],[4]   $ 599
Interest [1],[2],[4]   5.75%
Interest [1],[2],[4]   11.30%
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure ,LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   2,407,825
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure ,LLC Units, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] 12,177  
Fair value at ending balance [4],[18]   $ 12,177
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   1,243,071
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 15,678  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 3,148,007  
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 beginning balance [4] $ 6,868  
Fair value at ending balance $ 7,444 [15] $ 6,868 [4]
Interest [4]   8.00%
Investment, interest rate, paid in kind 10.00% [15] 10.00% [4]
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 15,741  
Interest [15] 8.00%  
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, Hotel, Gaming & Leisure, Subordinated Term Loan2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4] $ 15,649  
Fair value at ending balance [4]   $ 15,649
Investment, Identifier [Axis]: Coastal Marina Holdings, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 12,160 [4],[18] 0
Gross Additions [19],[20] 3,701 12,732
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] (183) (572)
Fair value at ending balance [19] 15,678 12,160 [4],[18]
Amount of Interest or Dividends Credited to Income [19],[22] $ 0 $ 0
Investment owned, balance (in shares) 2,407,825 2,407,825
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 [19] $ 15,649 $ 0
Gross Additions [19],[20] 70 15,632
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] 22 17
Fair value at ending balance [19] 15,741 15,649
Amount of Interest or Dividends Credited to Income [19],[22] $ 1,068 $ 715
Interest 8.00%  
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 [19] $ 6,868 $ 0
Gross Additions [19],[20] 591 6,879
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] (15) (11)
Fair value at ending balance [19] 7,444 6,868
Amount of Interest or Dividends Credited to Income [19],[22] $ 587 $ 371
Investment, interest rate, paid in kind 10.00% 10.00%
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 beginning balance [1],[2],[3],[4] $ 1,294  
Fair value at ending balance $ 1,303 [9],[15],[23],[24] $ 1,294 [1],[2],[3],[4]
Interest 6.25% [9],[15],[23],[24] 6.25% [1],[2],[3],[4]
Interest 10.90% [9],[15],[23],[24] 11.60% [1],[2],[3],[4]
Investment, Identifier [Axis]: Coherus Biosciences, Inc., Biotechnology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 3,895  
Interest [15],[23],[24] 8.00%  
Interest [15],[23],[24] 12.60%  
Investment, Identifier [Axis]: Coherus Biosciences, Inc., Biotechnology, Royalty Rights    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 3,819  
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 [4],[18] 176  
Fair value at ending balance [4],[18]   $ 176
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   33,324.69
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Software, Class B Partnership Units (33,324.69 units)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 190  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 33,324.69  
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 [2],[4],[27] $ 13,345  
Fair value at ending balance [2],[4],[27]   $ 13,345
Interest [2],[4],[27]   6.75%
Interest [2],[4],[27]   12.10%
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 [4],[18] 142  
Fair value at ending balance $ 146 [15],[17] $ 142 [4],[18]
Investment owned, balance (in shares) 46,085.6 [5],[7],[8],[15],[17] 46,085.6 [4],[10],[12],[13],[18]
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 [4] $ 622  
Fair value at ending balance $ 637 [15] $ 622 [4]
Interest 11.00% [15] 11.00% [4]
Investment, interest rate, paid in kind 1.00% [15] 1.00% [4]
Investment, Identifier [Axis]: Comply365, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 5,525  
Fair value at ending balance $ 13,129 [15],[24],[32] $ 5,525 [1],[2],[4]
Interest 5.00% [15],[24],[32] 5.00% [1],[2],[4]
Interest 10.00% [15],[24],[32] 10.40% [1],[2],[4]
Investment, Identifier [Axis]: Comply365, LLC, Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 12,997  
Fair value at ending balance $ 5,581 [15],[24],[32] $ 12,997 [1],[2],[4]
Interest 5.00% [15],[24],[32] 5.00% [1],[2],[4]
Interest 10.00% [15],[24],[32] 10.40% [1],[2],[4]
Investment, Identifier [Axis]: Comply365, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (22)  
Fair value at ending balance $ 0 [6],[15],[24],[32] $ (22) [1],[2],[4],[11]
Interest 5.00% [6],[15],[24],[32] 5.00% [1],[2],[4],[11]
Interest 10.00% [6],[15],[24],[32] 10.40% [1],[2],[4],[11]
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 [2],[3],[4],[28] $ 5,103  
Fair value at ending balance $ 5,150 [9],[15],[24],[29] $ 5,103 [2],[3],[4],[28]
Interest 5.15% [9],[15],[24],[29] 5.25% [2],[3],[4],[28]
Interest 8.80% [9],[15],[24],[29] 9.20% [2],[3],[4],[28]
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[18] $ 133  
Fair value at ending balance [3],[18]   $ 133
Investment owned, balance (in shares) [3],[10],[12],[13],[18]   91,504
Investment, Identifier [Axis]: Core Scientific, Inc., Technology, Equipment Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[35] 22,976  
Fair value at ending balance [3],[4],[35]   $ 22,976
Interest [3],[4],[35]   9.80%
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 [3],[4],[18] 211  
Fair value at ending balance [3],[4],[18]   $ 211
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   440
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[17] $ 220  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 440  
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 [3],[4],[18] $ 505  
Fair value at ending balance [3],[4],[18]   $ 505
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   191
Investment, Identifier [Axis]: Coyo Uprising GmbH, Technology, Class B Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[17] $ 400  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 191  
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 [2],[3],[4],[11],[28] $ 4,659  
Fair value at ending balance $ 4,810 [6],[9],[15],[24],[29] $ 4,659 [2],[3],[4],[11],[28]
Interest 6.50% [6],[9],[15],[24],[29] 3.25% [2],[3],[4],[11],[28]
Interest 9.70% [6],[9],[15],[24],[29] 6.30% [2],[3],[4],[11],[28]
Investment, interest rate, paid in kind 0.50% [6],[9],[15],[24],[29] 3.40% [2],[3],[4],[11],[28]
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 [2],[4],[11],[27] $ 5,944  
Fair value at ending balance $ 6,968 [15],[23],[24] $ 5,944 [2],[4],[11],[27]
Interest 5.00% [15],[23],[24] 5.50% [2],[4],[11],[27]
Interest 10.00% [15],[23],[24] 10.80% [2],[4],[11],[27]
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 [2],[4],[11],[27] $ 90  
Fair value at ending balance [2],[4],[11],[27]   $ 90
Interest [2],[4],[11],[27]   5.50%
Interest [2],[4],[11],[27]   10.80%
Investment, Identifier [Axis]: DISA Holdings Corp., Other Industrial, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 10.00%  
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 1,873  
Fair value at ending balance $ 1,866 [15],[24],[32] $ 1,873 [1],[2],[4]
Interest 5.50% [15],[24],[32] 5.75% [1],[2],[4]
Interest 10.80% [15],[24],[32] 11.10% [1],[2],[4]
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 [4],[18] $ 96  
Fair value at ending balance $ 113 [15],[17] $ 96 [4],[18]
Investment owned, balance (in shares) 96,153.85 [5],[7],[8],[15],[17] 96,153.85 [4],[10],[12],[13],[18]
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (7)  
Fair value at ending balance [1],[2],[4],[11]   $ (7)
Interest [1],[2],[4],[11]   5.75%
Interest [1],[2],[4],[11]   11.10%
Investment, Identifier [Axis]: DataServ Integrations, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 0  
Interest [6],[15],[24],[32] 5.50%  
Interest [6],[15],[24],[32] 10.80%  
Investment, Identifier [Axis]: David Wood Baking UK Ltd, Food Products, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[37] $ 1,491  
Interest [9],[15],[24],[37] 4.00%  
Interest [9],[15],[24],[37] 9.10%  
Investment, interest rate, paid in kind [9],[15],[24],[37] 7.00%  
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 18  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 1,016.1  
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 [4],[18] $ 41  
Fair value at ending balance [4],[18]   $ 41
Investment owned, balance (in shares) [4],[18]   1,280.8
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 22  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 1,280.8  
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 [2],[4],[27] $ 1,638  
Fair value at ending balance $ 1,539 [15],[23],[24] $ 1,638 [2],[4],[27]
Interest 6.25% [15],[23],[24] 6.25% [2],[4],[27]
Interest 11.50% [15],[23],[24] 11.70% [2],[4],[27]
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ (9)  
Fair value at ending balance [2],[4],[11],[27]   $ (9)
Interest [2],[4],[11],[27]   6.25%
Interest [2],[4],[11],[27]   11.70%
Investment, Identifier [Axis]: DecksDirect, LLC, Building Materials, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 332  
Interest [6],[15],[23],[24] 6.25%  
Interest [6],[15],[23],[24] 11.50%  
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],[2],[4] $ 6,416  
Fair value at ending balance [1],[2],[4]   $ 6,416
Interest [1],[2],[4]   6.50%
Interest [1],[2],[4]   12.00%
Investment, Identifier [Axis]: Diversified Packaging Holdings LLC, Business Equipment & Services, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 285  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 2,769  
Investment, Identifier [Axis]: Diversified Packaging Holdings LLC, Business Equipment & Services, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 713  
Interest [15] 11.00%  
Interest [15] 1.50%  
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 beginning balance [2],[3],[4],[38] $ 2,734  
Fair value at ending balance $ 2,790 [9],[15],[24],[29] $ 2,734 [2],[3],[4],[38]
Interest 6.50% [9],[15],[24],[29] 6.75% [2],[3],[4],[38]
Interest 10.10% [9],[15],[24],[29] 10.90% [2],[3],[4],[38]
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 [2],[3],[4],[28] $ 2,349  
Fair value at ending balance $ 2,373 [9],[15],[24],[29] $ 2,349 [2],[3],[4],[28]
Interest 5.25% [9],[15],[24],[29] 5.25% [2],[3],[4],[28]
Interest 8.60% [9],[15],[24],[29] 9.20% [2],[3],[4],[28]
Investment, Identifier [Axis]: Dryden 43 Senior Loan Fund, Series 2016-43A, Multi-Sector Holdings, Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[16] $ 1,647  
Fair value at ending balance 1,411 [9],[14] $ 1,647 [3],[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 [3],[16],[18] 3,319  
Fair value at ending balance 984 [9],[14],[17] 3,319 [3],[16],[18]
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ 85  
Interest [6],[9],[15],[24],[29] 4.00%  
Interest [6],[9],[15],[24],[29] 7.40%  
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 [2],[3],[4],[11],[28] $ 115  
Fair value at ending balance $ 1,324 [9],[15],[23],[24] $ 115 [2],[3],[4],[11],[28]
Interest 4.00% [9],[15],[23],[24] 6.00% [2],[3],[4],[11],[28]
Interest 8.80% [9],[15],[23],[24] 10.00% [2],[3],[4],[11],[28]
Investment, Identifier [Axis]: Dune Group, Health Care Equipment, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 1,401  
Fair value at ending balance [1],[2],[3],[4]   $ 1,401
Interest [1],[2],[3],[4]   6.00%
Interest [1],[2],[3],[4]   11.30%
Investment, Identifier [Axis]: Dunlipharder B.V., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] 993  
Fair value at ending balance $ 997 [9],[15],[23],[24] $ 993 [1],[2],[3],[4]
Interest 5.25% [9],[15],[23],[24] 6.10% [1],[2],[3],[4]
Interest 10.60% [9],[15],[23],[24] 11.50% [1],[2],[3],[4]
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 beginning balance [1],[2],[4] $ 14,479  
Fair value at ending balance $ 14,627 [15],[23],[24] $ 14,479 [1],[2],[4]
Interest 5.75% [15],[23],[24] 5.75% [1],[2],[4]
Interest 10.50% [15],[23],[24] 11.20% [1],[2],[4]
Investment, Identifier [Axis]: EFC International, Automotive, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 301  
Fair value at ending balance $ 396 [15],[17] $ 301 [4],[18]
Investment owned, balance (in shares) 163.83 [5],[7],[8],[15],[17] 163.83 [4],[18]
Investment, Identifier [Axis]: EFC International, Automotive, Senior Unsecured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4] $ 764  
Fair value at ending balance $ 784 [15] $ 764 [4]
Interest 11.00% [15] 11.00% [4]
Investment, interest rate, paid in kind 2.50% [15] 2.50% [4]
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 11,155  
Fair value at ending balance $ 11,597 [15],[23],[24] $ 11,155 [1],[2],[4]
Interest 5.75% [15],[23],[24] 5.75% [1],[2],[4]
Interest 10.90% [15],[23],[24] 11.50% [1],[2],[4]
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 2,233  
Fair value at ending balance [1],[2],[4],[11]   $ 2,233
Interest [1],[2],[4],[11]   5.75%
Interest [1],[2],[4],[11]   11.50%
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Diversified Manufacturing, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 160  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 10.90%  
Investment, Identifier [Axis]: EPS NASS Parent, Inc., Electrical Components & Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 5,740  
Fair value at ending balance [1],[2],[4]   $ 5,740
Interest [1],[2],[4]   5.75%
Interest [1],[2],[4]   11.10%
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 [4],[18] 491  
Fair value at ending balance [4],[18]   $ 491
Investment owned, balance (in shares) [4],[18]   530.92
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 ending balance [15],[17] $ 376  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 530.92  
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Air Transportation, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 8,844  
Fair value at ending balance $ 9,461 [15],[24],[32] $ 8,844 [1],[2],[4]
Interest 7.00% [15],[24],[32] 7.00% [1],[2],[4]
Interest 11.90% [15],[24],[32] 12.50% [1],[2],[4]
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 $ 5,500  
Fair value at ending balance 6,800 $ 5,500
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 [4] 145,799  
Fair value at ending balance [4]   $ 145,799
Investment owned, balance (in shares) [4],[10],[12],[13]   89,447,396
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 ending balance [15] $ 136,854  
Investment owned, balance (in shares) [5],[7],[8],[15] 89,447,396  
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 [4],[11],[27] $ 5,545  
Fair value at ending balance $ 6,818 [6],[15],[32] $ 5,545 [4],[11],[27]
Interest 7.25% [6],[15],[32] 7.25% [4],[11],[27]
Interest 12.20% [6],[15],[32] 12.60% [4],[11],[27]
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 [4] $ 4,545  
Fair value at ending balance $ 4,545 [15] $ 4,545 [4]
Interest 7.50% [15] 7.50% [4]
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 [19] $ 145,799 $ 135,066
Gross Additions [19],[20] 0 354
Gross Reductions [19],[21] 0 (621)
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] (8,945) 11,000
Fair value at ending balance [19] 136,854 145,799
Amount of Interest or Dividends Credited to Income [19],[22] $ 10,906 $ 14,498
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 [19] $ 5,545 $ 5,273
Gross Additions [19],[20] 20,742 35,201
Gross Reductions [19],[21] (19,455) (34,909)
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] (14) (20)
Fair value at ending balance [19] 6,818 5,545
Amount of Interest or Dividends Credited to Income [19],[22] $ 590 $ 408
Interest 7.25% 7.25%
Interest 12.60% 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 [19] $ 4,545 $ 4,545
Gross Additions [19],[20] 5 6
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] (5) (6)
Fair value at ending balance [19] 4,545 4,545
Amount of Interest or Dividends Credited to Income [19],[22] $ 260 $ 347
Interest 7.50% 7.50%
Investment, Identifier [Axis]: Electrical Components International, Inc., Electrical Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[33] $ 10,451  
Interest [6],[15],[24],[33] 6.50%  
Interest [6],[15],[24],[33] 11.20%  
Investment, Identifier [Axis]: Ellkay, LLC, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,430  
Fair value at ending balance [1],[2],[4]   $ 4,430
Interest [1],[2],[4]   6.25%
Interest [1],[2],[4]   11.50%
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 ending balance [15],[24],[33] $ 4,277  
Interest [15],[24],[33] 7.50%  
Interest [15],[24],[33] 12.60%  
Investment, interest rate, paid in kind [15],[24],[33] 2.00%  
Investment, Identifier [Axis]: Entact Environmental Services, Inc., Environmental Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 7,245  
Fair value at ending balance $ 6,618 [15],[23],[24] $ 7,245 [1],[2],[4]
Interest 5.75% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.40% [15],[23],[24] 10.90% [1],[2],[4]
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34],[46] $ 791  
Interest [9],[15],[24],[34],[46] 7.00%  
Interest [9],[15],[24],[34],[46] 8.10%  
Investment, interest rate, paid in kind [9],[15],[24],[34],[46] 2.80%  
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 [2],[3],[4],[11],[28] $ 1,047  
Fair value at ending balance $ (1,410) [6],[9],[15],[24],[34],[46] $ 1,047 [2],[3],[4],[11],[28]
Interest 7.00% [6],[9],[15],[24],[34],[46] 4.50% [2],[3],[4],[11],[28]
Interest 10.90% [6],[9],[15],[24],[34],[46] 8.50% [2],[3],[4],[11],[28]
Investment, interest rate, paid in kind [2],[3],[4],[11],[28]   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],[2],[3],[4] $ 700  
Fair value at ending balance $ 391 [9],[15],[23],[24],[46] $ 700 [1],[2],[3],[4]
Interest 4.50% [9],[15],[23],[24],[46] 4.50% [1],[2],[3],[4]
Interest 9.80% [9],[15],[23],[24],[46] 9.80% [1],[2],[3],[4]
Investment, interest rate, paid in kind 2.80% [9],[15],[23],[24],[46] 2.80% [1],[2],[3],[4]
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 [2],[3],[4],[36] $ 2,096  
Fair value at ending balance $ 1,231 [9],[15],[24],[39],[46] $ 2,096 [2],[3],[4],[36]
Interest 4.50% [9],[15],[24],[39],[46] 4.50% [2],[3],[4],[36]
Interest 9.70% [9],[15],[24],[39],[46] 9.50% [2],[3],[4],[36]
Investment, interest rate, paid in kind 2.80% [9],[15],[24],[39],[46] 2.80% [2],[3],[4],[36]
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 beginning balance [3],[4] $ 543  
Fair value at ending balance $ 0 [9],[15],[46] $ 543 [3],[4]
Investment, interest rate, paid in kind 11.50% [9],[15],[46] 11.50% [3],[4]
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 [2],[3],[4],[11],[41] $ 1,535  
Fair value at ending balance $ 1,550 [6],[9],[15],[24],[42] $ 1,535 [2],[3],[4],[11],[41]
Interest 6.50% [6],[9],[15],[24],[42] 6.50% [2],[3],[4],[11],[41]
Interest 11.00% [6],[9],[15],[24],[42] 10.80% [2],[3],[4],[11],[41]
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 beginning balance [2],[3],[4],[41] $ 20  
Fair value at ending balance [2],[3],[4],[41]   $ 20
Interest [2],[3],[4],[41]   6.50%
Interest [2],[3],[4],[41]   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 ending balance [15],[23],[24] $ 6,092  
Interest [15],[23],[24] 6.50%  
Interest [15],[23],[24] 12.10%  
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 6,324  
Fair value at ending balance [1],[2],[4]   $ 6,324
Interest [1],[2],[4]   6.50%
Interest [1],[2],[4]   12.20%
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Consumer Cyclical, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 138  
Fair value at ending balance [1],[2],[4],[11]   $ 138
Interest [1],[2],[4],[11]   6.50%
Interest [1],[2],[4],[11]   12.20%
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 ending balance [6],[15],[23],[24] $ 129  
Interest [6],[15],[23],[24] 6.50%  
Interest [6],[15],[23],[24] 12.10%  
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 [2],[3],[4],[28] $ 1,933  
Fair value at ending balance $ 1,988 [9],[15],[24],[43] $ 1,933 [2],[3],[4],[28]
Interest 6.25% [9],[15],[24],[43] 6.50% [2],[3],[4],[28]
Interest 9.60% [9],[15],[24],[43] 10.50% [2],[3],[4],[28]
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,768  
Fair value at ending balance $ 4,752 [15],[24],[32] $ 4,768 [1],[2],[4]
Interest 5.00% [15],[24],[32] 5.75% [1],[2],[4]
Interest 9.80% [15],[24],[32] 11.10% [1],[2],[4]
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 [4],[18] $ 16  
Fair value at ending balance [4],[18]   $ 16
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   1,160.9
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 15  
Investment owned, balance (in shares) [5],[7],[8],[15] 1,160.9  
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 [4],[18] $ 72  
Fair value at ending balance [4],[18]   $ 72
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   5,104.3
Investment, Identifier [Axis]: FSS Buyer LLC, Technology, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 65  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 5,104.3  
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 beginning balance [2],[3],[4],[11],[28] $ 1,632  
Fair value at ending balance $ 1,667 [6],[9],[15],[24],[29] $ 1,632 [2],[3],[4],[11],[28]
Interest 6.00% [6],[9],[15],[24],[29] 6.25% [2],[3],[4],[11],[28]
Interest 9.30% [6],[9],[15],[24],[29] 10.20% [2],[3],[4],[11],[28]
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 [4] $ 2,670  
Fair value at ending balance [4]   $ 2,670
Investment owned, balance (in shares) [4],[10],[12],[13]   2,886
Investment, Identifier [Axis]: Ferrellgas L.P., Oil & Gas Equipment & Services, Opco Preferred Units (2,886 units)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 2,857  
Investment owned, balance (in shares) [5],[7],[8],[15] 2,886  
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 [4] $ 5,266  
Fair value at ending balance [4]   $ 5,266
Investment owned, balance (in shares) [4],[10],[12],[13]   6,582.7
Investment, interest rate, paid in kind [4]   11.00%
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings Inc., Business Equipment & Services, Preferred Stock (6,582.7 shares)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 4,805  
Investment owned, balance (in shares) [5],[7],[8],[15] 6,582.7  
Investment, interest rate, paid in kind [15] 11.00%  
Investment, Identifier [Axis]: Finaxy Holding, Banking, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34] $ 4,564  
Interest [9],[15],[24],[34] 6.25%  
Interest [9],[15],[24],[34] 9.90%  
Investment, Identifier [Axis]: Finaxy Holding, Banking, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15] $ 2,071  
Investment, interest rate, paid in kind [9],[15] 10.30%  
Investment, Identifier [Axis]: Finaxy Holding, Banking, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4] $ 2,009  
Fair value at ending balance [3],[4]   $ 2,009
Investment, interest rate, paid in kind [3],[4]   10.30%
Investment, Identifier [Axis]: Finaxy Holding,Banking,First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[28] 4,431  
Fair value at ending balance [2],[3],[4],[28]   $ 4,431
Interest [2],[3],[4],[28]   6.25%
Interest [2],[3],[4],[28]   10.20%
Investment, Identifier [Axis]: Fineline Technologies, Inc, Consumer Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 1,275  
Fair value at ending balance [1],[2],[4]   $ 1,275
Interest [1],[2],[4]   4.75%
Interest [1],[2],[4]   10.10%
Investment, Identifier [Axis]: Fineline Technologies, Inc., Consumer Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 1,263  
Interest [15],[23],[24] 4.75%  
Interest [15],[23],[24] 9.40%  
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 [2],[3],[4],[11],[38] $ 4,230  
Fair value at ending balance $ 4,934 [9],[15],[24],[34] $ 4,230 [2],[3],[4],[11],[38]
Interest 6.50% [9],[15],[24],[34] 6.25% [2],[3],[4],[11],[38]
Interest 10.20% [9],[15],[24],[34] 9.90% [2],[3],[4],[11],[38]
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 [2],[4],[27] $ 4,073  
Fair value at ending balance $ 4,132 [15],[24],[32] $ 4,073 [2],[4],[27]
Interest 4.75% [15],[24],[32] 4.75% [2],[4],[27]
Interest 9.70% [15],[24],[32] 10.10% [2],[4],[27]
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 [4],[18] $ 855  
Fair value at ending balance [4],[18]   $ 855
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   966.99
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 551  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 966.99  
Investment, Identifier [Axis]: Five Star Holding LLC, Packaging, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 13,404  
Fair value at ending balance $ 12,761 [15],[23],[24] $ 13,404 [1],[2],[4]
Interest 7.25% [15],[23],[24] 7.25% [1],[2],[4]
Interest 12.30% [15],[23],[24] 12.60% [1],[2],[4]
Investment, Identifier [Axis]: Flexential Issuer, LLC, Information Technology, Structured Secured Note - Class C    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 13,187  
Fair value at ending balance $ 15,337 $ 13,187
Interest 6.90% 6.90%
Investment, Identifier [Axis]: Flywheel Re Segregated Portfolio 2022-4, Investment Funds, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[18] $ 3,196  
Fair value at ending balance [3],[4],[18]   $ 3,196
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   2,828,286
Investment, Identifier [Axis]: Flywheel Re Segregated Portfolio 2022-4, Investment Funds, Preferred Stock (2,828,286 shares)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[17] $ 3,648  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 2,828,286  
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 [2],[3],[4],[11],[36] $ 1,808  
Fair value at ending balance $ 230 [6],[9],[15],[24],[29] $ 1,808 [2],[3],[4],[11],[36]
Interest 6.50% [6],[9],[15],[24],[29] 6.75% [2],[3],[4],[11],[36]
Interest 10.20% [6],[9],[15],[24],[29] 11.90% [2],[3],[4],[11],[36]
Investment, Identifier [Axis]: Footco 40 Limited, Media & Entertainment, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[37] $ 1,665  
Interest [6],[9],[15],[24],[37] 6.50%  
Interest [6],[9],[15],[24],[37] 11.50%  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, Class A LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 127  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 122  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, Class B LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 97  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 122  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 491  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.10%  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 5,609  
Interest [15],[23],[24] 5.50%  
Interest [15],[23],[24] 10.10%  
Investment, Identifier [Axis]: Forest Buyer, LLC, Healthcare, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.10%  
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Other Financial, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 2,480  
Fair value at ending balance $ 8,727 [6],[15],[23],[24] $ 2,480 [1],[2],[4]
Interest 5.75% [6],[15],[23],[24] 5.25% [1],[2],[4]
Interest 10.00% [6],[15],[23],[24] 10.70% [1],[2],[4]
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Other Financial, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (10)  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 10.00%  
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,384  
Fair value at ending balance $ 4,510 [15],[23],[24] $ 4,384 [1],[2],[4]
Interest 5.75% [15],[23],[24] 5.75% [1],[2],[4]
Interest 10.00% [15],[23],[24] 11.40% [1],[2],[4]
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 [4],[18] $ 632  
Fair value at ending balance [4],[18]   $ 632
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   937.5
Investment, Identifier [Axis]: FragilePak LLC, Transportation Services, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 673  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 937.5  
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 10,573  
Fair value at ending balance $ 10,450 [15],[23],[24] $ 10,573 [1],[2],[4]
Interest 6.25% [15],[23],[24] 6.25% [1],[2],[4]
Interest 10.90% [15],[23],[24] 11.60% [1],[2],[4]
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 [4],[18] $ 880  
Fair value at ending balance $ 1,222 [15],[17] $ 880 [4],[18]
Investment owned, balance (in shares) 687 [5],[7],[8],[15],[17] 687 [4],[10],[12],[13],[18]
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Capital Goods, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (15)  
Fair value at ending balance [1],[2],[4],[11]   $ (15)
Interest [1],[2],[4],[11]   6.25%
Interest [1],[2],[4],[11]   11.60%
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 [6],[15],[23],[24] $ (26)  
Interest [6],[15],[23],[24] 6.25%  
Interest [6],[15],[23],[24] 10.90%  
Investment, Identifier [Axis]: GCDL LLC, Healthcare, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 243  
Investment owned, balance (in shares) [5],[7],[8],[15] 243,243.24  
Investment, Identifier [Axis]: GCDL LLC, Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 529  
Interest [15],[23],[24] 6.00%  
Interest [15],[23],[24] 10.40%  
Investment, Identifier [Axis]: GCDL LLC, Healthcare, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ (2)  
Interest [15],[23],[24] 6.00%  
Interest [15],[23],[24] 10.40%  
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[18] $ 0  
Fair value at ending balance $ 0 [9],[15],[17] $ 0 [3],[4],[18]
Investment owned, balance (in shares) 5,785 [5],[7],[8],[9],[15],[17] 5,785 [3],[4],[10],[12],[13],[18]
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 ending balance [9],[15],[24],[43],[46] $ 141  
Interest [9],[15],[24],[43],[46] 6.00%  
Interest [9],[15],[24],[43],[46] 9.90%  
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 beginning balance [2],[3],[4],[55] $ 265  
Fair value at ending balance $ 272 [6],[9],[15] $ 265 [2],[3],[4],[55]
Interest 10.00% [6],[9],[15] 10.00% [2],[3],[4],[55]
Interest [2],[3],[4],[55]   13.80%
Investment, Identifier [Axis]: GPNZ II GmbH, Healthcare, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[11] $ 124  
Fair value at ending balance [3],[4],[11]   $ 124
Investment, interest rate, paid in kind [3],[4],[11]   10.00%
Investment, Identifier [Axis]: Global Academic Group Limited, Industrial Other, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[42] $ 2,538  
Interest [9],[15],[24],[42] 5.50%  
Interest [9],[15],[24],[42] 9.40%  
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 [2],[3],[4],[56] $ 2,478  
Fair value at ending balance $ 4,352 [6],[9],[15],[24],[57] $ 2,478 [2],[3],[4],[56]
Interest 5.50% [6],[9],[15],[24],[57] 6.00% [2],[3],[4],[56]
Interest 10.20% [6],[9],[15],[24],[57] 10.30% [2],[3],[4],[56]
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 [2],[3],[4],[11],[58] $ 4,295  
Fair value at ending balance [2],[3],[4],[11],[58]   $ 4,295
Interest [2],[3],[4],[11],[58]   6.00%
Interest [2],[3],[4],[11],[58]   11.70%
Investment, Identifier [Axis]: Gojo Industries, Inc. ,Industrial Other,First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 12,359  
Fair value at ending balance [1],[2],[4]   $ 12,359
Interest [1],[2],[4]   5.00%
Interest [1],[2],[4]   10.40%
Investment, interest rate, paid in kind [1],[2],[4]   4.50%
Investment, Identifier [Axis]: Gojo Industries, Inc., Industrial Other, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24],[32] $ 12,997  
Interest [15],[24],[32] 9.50%  
Interest [15],[24],[32] 9.90%  
Investment, interest rate, paid in kind [15],[24],[32] 4.50%  
Investment, Identifier [Axis]: Graphpad Software, LLC, 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 [6],[15],[23],[24] $ 9,481  
Interest [6],[15],[23],[24] 4.75%  
Interest [6],[15],[23],[24] 9.40%  
Investment, Identifier [Axis]: Graphpad Software, LLC, Internet Software & Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (4)  
Interest [6],[15],[23],[24] 4.75%  
Interest [6],[15],[23],[24] 9.40%  
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 ending balance [6],[9],[15],[24],[29] $ 1,009  
Interest [6],[9],[15],[24],[29] 5.10%  
Interest [6],[9],[15],[24],[29] 8.80%  
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 [2],[3],[4],[11],[28] $ 894  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 894
Interest [2],[3],[4],[11],[28]   5.25%
Interest [2],[3],[4],[11],[28]   9.20%
Investment, Identifier [Axis]: Groupe Guemas, Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34] $ 5,107  
Interest [9],[15],[24],[34] 6.25%  
Interest [9],[15],[24],[34] 9.90%  
Investment, Identifier [Axis]: Groupe Guemas,Brokerage, Asset Managers & Exchanges ,First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[38] $ 5,006  
Fair value at ending balance [2],[3],[4],[38]   $ 5,006
Interest [2],[3],[4],[38]   6.25%
Interest [2],[3],[4],[38]   10.10%
Investment, Identifier [Axis]: Groupe Product Life, Consumer Non-cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[28] 1,059  
Fair value at ending balance [2],[3],[4],[28]   $ 1,059
Interest [2],[3],[4],[28]   6.50%
Interest [2],[3],[4],[28]   10.40%
Investment, Identifier [Axis]: Groupe Product Life, ConsumerNon-cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ 932  
Interest [6],[9],[15],[24],[29] 6.25%  
Interest [6],[9],[15],[24],[29] 9.60%  
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],[2] $ 570  
Fair value at ending balance [1],[2]   $ 570
Interest [1],[2]   6.75%
Interest [1],[2]   12.20%
Investment, Identifier [Axis]: Gusto Aus BidCo Pty Ltd, ConsumerNon-Cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[42] $ 2,316  
Interest [6],[9],[15],[24],[42] 6.50%  
Interest [6],[9],[15],[24],[42] 11.00%  
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 [2],[3],[4],[11],[56] $ 2,235  
Fair value at ending balance [2],[3],[4],[11],[56]   $ 2,235
Interest [2],[3],[4],[11],[56]   6.50%
Interest [2],[3],[4],[11],[56]   10.90%
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 ending balance [6],[9],[15],[24],[29] $ 5,227  
Interest [6],[9],[15],[24],[29] 6.25%  
Interest [6],[9],[15],[24],[29] 9.60%  
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 [2],[3],[4],[11],[28] $ 5,080  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 5,080
Interest [2],[3],[4],[11],[28]   6.50%
Interest [2],[3],[4],[11],[28]   10.40%
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 beginning balance [1],[2],[4],[11] 11,355  
Fair value at ending balance $ 10,434 [6],[15],[23],[24] $ 11,355 [1],[2],[4],[11]
Interest 8.50% [6],[15],[23],[24] 8.50% [1],[2],[4],[11]
Interest 13.50% [6],[15],[23],[24] 14.00% [1],[2],[4],[11]
Investment, Identifier [Axis]: HTI Technology & Industries, Electronic Component Manufacturing, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (7)  
Fair value at ending balance [1],[2],[4],[11]   $ (7)
Interest [1],[2],[4],[11]   8.50%
Interest [1],[2],[4],[11]   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 ending balance [6],[15],[23],[24] $ (68)  
Interest [6],[15],[23],[24] 8.50%  
Interest [6],[15],[23],[24] 13.50%  
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 11,059  
Interest [15],[23],[24] 5.75%  
Interest [15],[23],[24] 11.20%  
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), Advertising, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 10,816  
Fair value at ending balance [1],[2],[4]   $ 10,816
Interest [1],[2],[4]   6.25%
Interest [1],[2],[4]   11.80%
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 ending balance [6],[9],[15],[24],[42] $ 642  
Interest [6],[9],[15],[24],[42] 5.25%  
Interest [6],[9],[15],[24],[42] 9.70%  
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 [2],[3],[4],[11],[56] $ 674  
Fair value at ending balance [2],[3],[4],[11],[56]   $ 674
Interest [2],[3],[4],[11],[56]   4.75%
Interest [2],[3],[4],[11],[56]   9.40%
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Healthcare, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 12,371  
Investment, interest rate, paid in kind [15] 11.00%  
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 [4] $ 11,012  
Fair value at ending balance [4]   $ 11,012
Investment, interest rate, paid in kind [4]   11.00%
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 [2],[4],[27] 7,295  
Fair value at ending balance $ 7,239 [15],[23],[24] $ 7,295 [2],[4],[27]
Interest 5.50% [15],[23],[24] 5.50% [2],[4],[27]
Interest 10.10% [15],[23],[24] 10.90% [2],[4],[27]
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 [2],[4],[11],[27] $ 0  
Fair value at ending balance [2],[4],[11],[27]   $ 0
Interest [2],[4],[11],[27]   5.50%
Interest [2],[4],[11],[27]   10.90%
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.10%  
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 [2],[3],[4],[38] $ 3,155  
Fair value at ending balance $ 3,265 [9],[15],[24],[34] $ 3,155 [2],[3],[4],[38]
Interest 5.50% [9],[15],[24],[34] 5.00% [2],[3],[4],[38]
Interest 9.10% [9],[15],[24],[34] 8.90% [2],[3],[4],[38]
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 118  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 [15],[24],[32] $ 7,238  
Interest [15],[24],[32] 6.00%  
Interest [15],[24],[32] 10.90%  
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ (7)  
Interest [6],[15],[24],[32] 6.00%  
Interest [6],[15],[24],[32] 10.90%  
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 101  
Fair value at ending balance [4],[18]   $ 101
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   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 beginning balance [1],[2],[4] 7,101  
Fair value at ending balance [1],[2],[4]   $ 7,101
Interest [1],[2],[4]   6.00%
Interest [1],[2],[4]   11.40%
Investment, Identifier [Axis]: HemaSource, Inc., Healthcare., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 342  
Fair value at ending balance [1],[2],[4],[11]   $ 342
Interest [1],[2],[4],[11]   6.00%
Interest [1],[2],[4],[11]   11.40%
Investment, Identifier [Axis]: Herbalife Ltd., Food Products, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[24],[32] $ 3,188  
Interest [9],[24],[32] 11.60%  
Interest [9],[24],[32] 6.75%  
Investment, Identifier [Axis]: Home Care Assistance, LLC, Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 3,428  
Fair value at ending balance $ 3,520 [15],[23],[24] $ 3,428 [1],[2],[4]
Interest 5.00% [15],[23],[24] 5.00% [1],[2],[4]
Interest 10.40% [15],[23],[24] 10.50% [1],[2],[4]
Investment, Identifier [Axis]: HomeX Services Group LLC, Home Construction, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ 1,274  
Fair value at ending balance $ 1,502 [6],[15],[23],[24] $ 1,274 [2],[4],[11],[27]
Interest 5.50% [6],[15],[23],[24] 5.50% [2],[4],[11],[27]
Interest 10.10% [6],[15],[23],[24] 10.90% [2],[4],[11],[27]
Investment, Identifier [Axis]: HomeX Services Group LLC, Home Construction, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ (7)  
Fair value at ending balance [2],[4],[11],[27]   $ (7)
Interest [2],[4],[11],[27]   5.50%
Interest [2],[4],[11],[27]   10.90%
Investment, Identifier [Axis]: HomeX Services Group LLC, Home Construction, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.10%  
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 [2],[3],[4],[27] $ 6,160  
Fair value at ending balance $ 6,629 [9],[15],[24],[33] $ 6,160 [2],[3],[4],[27]
Interest 5.00% [9],[15],[24],[33] 5.00% [2],[3],[4],[27]
Interest 10.30% [9],[15],[24],[33] 10.50% [2],[3],[4],[27]
Investment, Identifier [Axis]: Hydratech Holdings, Inc., Distributors, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 4,175  
Interest [15],[23],[24] 5.00%  
Interest [15],[23],[24] 9.60%  
Investment, Identifier [Axis]: Hydratech Holdings, Inc., Distributors, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 62  
Interest [15],[23],[24] 5.00%  
Interest [15],[23],[24] 9.60%  
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 [2],[3],[4],[38] $ 1,739  
Fair value at ending balance [2],[3],[4],[38]   $ 1,739
Interest [2],[3],[4],[38]   6.25%
Interest [2],[3],[4],[38]   10.40%
Investment, Identifier [Axis]: Hygie 31 Holding, Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34] $ 1,615  
Interest [9],[15],[24],[34] 5.63%  
Interest [9],[15],[24],[34] 8.90%  
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 [19] $ 2,013 $ 4,496
Gross Additions [19],[20] 0 0
Gross Reductions [19],[21] (1,040) 0
Amount of Realized Gain (Loss) [19] (4,179) 0
Amount of Unrealized Gain (Loss) [19] 3,206 (2,483)
Fair value at ending balance [19] 0 2,013
Amount of Interest or Dividends Credited to Income [19],[22] $ 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 [4],[18] $ 2,013  
Fair value at ending balance [4],[18]   $ 2,013
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   102,144
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Construction & Building, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 3,917  
Fair value at ending balance [1],[2],[4]   $ 3,917
Interest [1],[2],[4]   8.00%
Interest [1],[2],[4]   13.40%
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 [19] 4,519 [1],[2],[4] $ 4,098
Gross Additions [19],[20] 161 421
Gross Reductions [19],[21] (4,680) 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] 0 0
Fair value at ending balance [19] 0 4,519 [1],[2],[4]
Amount of Interest or Dividends Credited to Income [19],[22] $ 181 $ 665
Interest 3.00% [15],[23],[24] 3.00% [1],[2],[4]
Interest 8.30% 8.50% [1],[2],[4]
Investment, interest rate, paid in kind [19] 7.00%  
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 [19] $ 3,917 $ 3,917
Gross Additions [19],[20] 172 75
Gross Reductions [19],[21] (3,917) 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] (172) (75)
Fair value at ending balance [19] 0 3,917
Amount of Interest or Dividends Credited to Income [19],[22] $ 311 $ 592
Interest 8.00% 8.00%
Interest 13.40% 13.40%
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 [2],[3],[4],[28] $ 2,713  
Fair value at ending balance $ 2,723 [9],[15],[24],[29] $ 2,713 [2],[3],[4],[28]
Interest 5.55% [9],[15],[24],[29] 5.50% [2],[3],[4],[28]
Interest 8.80% [9],[15],[24],[29] 9.50% [2],[3],[4],[28]
Investment, Identifier [Axis]: INOS 19-090 GmbH, Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[28] $ 5,711  
Fair value at ending balance $ 5,173 [9],[15],[24],[29] $ 5,711 [2],[3],[4],[11],[28]
Interest 5.38% [9],[15],[24],[29] 5.37% [2],[3],[4],[11],[28]
Interest 8.80% [9],[15],[24],[29] 9.30% [2],[3],[4],[11],[28]
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Healthcare First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 6,616  
Fair value at ending balance [1],[2],[4]   $ 6,616
Interest [1],[2],[4]   6.25%
Interest [1],[2],[4]   11.60%
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24],[33] $ 6,735  
Interest [15],[24],[33] 6.00%  
Interest [15],[24],[33] 10.20%  
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Healthcare, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (18)  
Fair value at ending balance [1],[2],[4],[11]   $ (18)
Interest [1],[2],[4],[11]   6.25%
Interest [1],[2],[4],[11]   11.60%
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Healthcare, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[33] $ 0  
Interest [6],[15],[24],[33] 6.00%  
Interest [6],[15],[24],[33] 10.20%  
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 [4],[18] $ 715  
Fair value at ending balance [4],[18]   $ 715
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   7,500.4
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 727  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 7,500.4  
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 12,757  
Fair value at ending balance $ 785 [15],[24],[33] $ 12,757 [1],[2],[4]
Interest 6.25% [15],[24],[33] 6.50% [1],[2],[4]
Interest 10.60% [15],[24],[33] 12.00% [1],[2],[4]
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24],[33] $ 11,915  
Interest [15],[24],[33] 6.50%  
Interest [15],[24],[33] 10.80%  
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 67  
Fair value at ending balance [1],[2],[4],[11]   $ 67
Interest [1],[2],[4],[11]   6.50%
Interest [1],[2],[4],[11]   12.00%
Investment, Identifier [Axis]: ITI Intermodal, Inc., Transportation Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[33] $ 197  
Interest [6],[15],[24],[33] 6.50%  
Interest [6],[15],[24],[33] 10.80%  
Investment, Identifier [Axis]: Ice House America, L.L.C., Consumer Products, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 4,049  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.80%  
Investment, Identifier [Axis]: Ice House America, L.L.C., Consumer Products, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 287  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 2,703  
Investment, Identifier [Axis]: Ice House America, L.L.C., Consumer Products, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 142  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.80%  
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 [2],[3],[4],[38] $ 2,879  
Fair value at ending balance $ 2,933 [9],[15],[24],[34] $ 2,879 [2],[3],[4],[38]
Interest 4.75% [9],[15],[24],[34] 4.75% [2],[3],[4],[38]
Interest 8.10% [9],[15],[24],[34] 8.70% [2],[3],[4],[38]
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 ending balance [9],[15],[24],[34] $ 6,783  
Interest [9],[15],[24],[34] 5.50%  
Interest [9],[15],[24],[34] 9.20%  
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 beginning balance [2],[3],[4],[11],[38] $ 6,203  
Fair value at ending balance $ 1,072 [9],[15],[24],[59] $ 6,203 [2],[3],[4],[11],[38]
Interest 5.50% [9],[15],[24],[59] 5.75% [2],[3],[4],[11],[38]
Interest 6.70% [9],[15],[24],[59] 9.60% [2],[3],[4],[11],[38]
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 beginning balance [2],[3],[4],[60] $ 1,035  
Fair value at ending balance [2],[3],[4],[60]   $ 1,035
Interest [2],[3],[4],[60]   5.75%
Interest [2],[3],[4],[60]   7.50%
Investment, Identifier [Axis]: Innovative XCessories & Services, LLC, Automotive, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[16],[25] 2,469  
Fair value at ending balance $ 2,789 [14],[23],[24] $ 2,469 [2],[16],[25]
Interest 4.25% [14],[23],[24] 4.25% [2],[16],[25]
Interest 9.00% [14],[23],[24] 9.90% [2],[16],[25]
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 [2],[3],[4],[11],[28] $ 1,676  
Fair value at ending balance $ 64 [9],[15],[24],[29] $ 1,676 [2],[3],[4],[11],[28]
Interest 6.25% [9],[15],[24],[29] 5.50% [2],[3],[4],[11],[28]
Interest 9.60% [9],[15],[24],[29] 9.40% [2],[3],[4],[11],[28]
Investment, Identifier [Axis]: Interstellar Group B.V., Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ 1,549  
Interest [6],[9],[15],[24],[29] 6.25%  
Interest [6],[9],[15],[24],[29] 9.60%  
Investment, Identifier [Axis]: InvoCare Limited, Consumer Cyclical Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[56] $ 2,051  
Fair value at ending balance $ 2,108 [6],[9],[15],[24],[42] $ 2,051 [2],[3],[4],[11],[56]
Interest 6.25% [6],[9],[15],[24],[42] 6.25% [2],[3],[4],[11],[56]
Interest 10.60% [6],[9],[15],[24],[42] 10.70% [2],[3],[4],[11],[56]
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 [2],[16],[27] $ 2,622  
Fair value at ending balance [2],[16],[27]   $ 2,622
Interest [2],[16],[27]   7.50%
Interest [2],[16],[27]   13.00%
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] 0  
Fair value at ending balance $ 0 [14],[15],[17] $ 0 [4],[18]
Investment owned, balance (in shares) 58,538 [5],[7],[8],[14],[15],[17] 58,538 [4],[10],[12],[13],[18]
Investment, Identifier [Axis]: Isagenix International, LLC, Wholesale, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[16] $ 718  
Fair value at ending balance $ 223 [14],[15],[23],[24] $ 718 [1],[2],[16]
Interest 6.50% [14],[15],[23],[24] 5.60% [1],[2],[16]
Interest 8.90% [14],[15],[23],[24] 10.60% [1],[2],[16]
Investment, interest rate, paid in kind [14],[15],[23],[24] 3.00%  
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 [2],[3],[4],[11],[28] $ 4,778  
Fair value at ending balance $ 5,459 [9],[15],[24],[29] $ 4,778 [2],[3],[4],[11],[28]
Interest 6.50% [9],[15],[24],[29] 6.50% [2],[3],[4],[11],[28]
Interest 10.20% [9],[15],[24],[29] 10.50% [2],[3],[4],[11],[28]
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],[2],[16] $ 4,800  
Fair value at ending balance $ 3,740 [14],[23],[24] $ 4,800 [1],[2],[16]
Interest 7.25% [14],[23],[24] 7.25% [1],[2],[16]
Interest 12.80% [14],[23],[24] 12.90% [1],[2],[16]
Investment, Identifier [Axis]: JF Acquisition, LLC, Automotive, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 3,598  
Fair value at ending balance $ 3,712 [15],[23],[24] $ 3,598 [1],[2],[4]
Interest 5.50% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.90% [15],[23],[24] 11.00% [1],[2],[4]
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34] $ 1,200  
Interest [9],[15],[24],[34] 5.25%  
Interest [9],[15],[24],[34] 9.00%  
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 [2],[3],[4],[38] $ 1,176  
Fair value at ending balance $ 1,957 [9],[15],[24],[33] $ 1,176 [2],[3],[4],[38]
Interest 5.25% [9],[15],[24],[33] 5.25% [2],[3],[4],[38]
Interest 7.00% [9],[15],[24],[33] 9.30% [2],[3],[4],[38]
Investment, interest rate, paid in kind [9],[15],[24],[33] 2.00%  
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 [2],[3],[4],[25] $ 6,648  
Fair value at ending balance $ 4,632 [9],[15],[24],[33] $ 6,648 [2],[3],[4],[25]
Interest 5.25% [9],[15],[24],[33] 5.25% [2],[3],[4],[25]
Interest 10.60% [9],[15],[24],[33] 10.60% [2],[3],[4],[25]
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 beginning balance $ 3,026  
Fair value at ending balance $ 2,825 $ 3,026
Interest 8.00% 8.00%
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 beginning balance [3],[11] $ 41,053  
Fair value at ending balance 40,871 [6],[9] $ 41,053 [3],[11]
Investment, Identifier [Axis]: Jocassee Partners LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 41,053 40,088
Gross Additions [20] 0 0 [19]
Gross Reductions [21] 0 0 [19]
Amount of Realized Gain (Loss) 0 0 [19]
Amount of Unrealized Gain (Loss) (182) 965 [19]
Fair value at ending balance 40,871 41,053 [19]
Amount of Interest or Dividends Credited to Income [22] 4,282 5,709 [19]
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 [2],[3],[4],[11],[58] 3,844  
Fair value at ending balance $ 3,920 [6],[9],[15],[24],[57] $ 3,844 [2],[3],[4],[11],[58]
Interest 4.50% [6],[9],[15],[24],[57] 4.50% [2],[3],[4],[11],[58]
Interest 10.20% [6],[9],[15],[24],[57] 10.20% [2],[3],[4],[11],[58]
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 3,414  
Fair value at ending balance $ 3,481 [15],[23],[24] $ 3,414 [1],[2],[4]
Interest 5.50% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.90% [15],[23],[24] 11.00% [1],[2],[4]
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 [4] $ 228  
Fair value at ending balance [4]   $ 228
Investment owned, balance (in shares) [4],[10],[12],[13]   1,018
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 ending balance [15] $ 278  
Investment owned, balance (in shares) [5],[7],[8],[15] 1,018  
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Consumer Products, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (8)  
Fair value at ending balance [1],[2],[4],[11]   $ (8)
Interest [1],[2],[4],[11]   5.50%
Interest [1],[2],[4],[11]   11.00%
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 ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.90%  
Investment, Identifier [Axis]: Kano Laboratories LLC, Chemicals, Plastics & Rubber, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 5,545  
Fair value at ending balance $ 8,388 [15],[23],[24] $ 5,545 [1],[2],[4],[11]
Interest 5.00% [15],[23],[24] 5.00% [1],[2],[4],[11]
Interest 10.40% [15],[23],[24] 10.50% [1],[2],[4],[11]
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 [4],[18] $ 224  
Fair value at ending balance [4],[18]   $ 224
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   203.2
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 ending balance [15],[17] $ 211  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 203.2  
Investment, Identifier [Axis]: Kemmerer Operations, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] $ 0 $ 1,181
Gross Additions [19],[20]   0
Gross Reductions [19],[21]   (2,300)
Amount of Realized Gain (Loss) [19]   711
Amount of Unrealized Gain (Loss) [19]   408
Fair value at ending balance [19]   0
Amount of Interest or Dividends Credited to Income [19],[22]   $ 0
Investment owned, balance (in shares)   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 [19] 0 $ 1,565
Gross Additions [19],[20]   237
Gross Reductions [19],[21]   (1,802)
Amount of Realized Gain (Loss) [19]   0
Amount of Unrealized Gain (Loss) [19]   0
Fair value at ending balance [19]   0
Amount of Interest or Dividends Credited to Income [19],[22]   $ 156
Investment, interest rate, paid in kind   15.00%
Investment, Identifier [Axis]: Kene Acquisition, Inc. (En Engineering), Oil & Gas Equipment & Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 7,031  
Fair value at ending balance [1],[2],[4]   $ 7,031
Interest [1],[2],[4]   4.25%
Interest [1],[2],[4]   9.70%
Investment, Identifier [Axis]: Keystone Bidco B.V., Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 732  
Interest [9],[15],[24],[29] 5.25%  
Interest [9],[15],[24],[29] 8.80%  
Investment, Identifier [Axis]: Keystone Bidco B.V., Pharmaceuticals, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ (4)  
Interest [9],[15],[24],[29] 5.25%  
Interest [9],[15],[24],[29] 8.80%  
Investment, Identifier [Axis]: Keystone Bidco B.V., Pharmaceuticals, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[23],[24] $ 0  
Interest [9],[15],[23],[24] 5.25%  
Interest [9],[15],[23],[24] 8.80%  
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, Media & Entertainment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 9,116  
Fair value at ending balance $ 13,190 [15],[23],[24] $ 9,116 [1],[2],[4]
Interest 4.75% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.20% [15],[23],[24] 10.80% [1],[2],[4]
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 [4],[18] $ 599  
Fair value at ending balance [4],[18]   $ 599
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   637,677.11
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 ending balance [15],[17] $ 721  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 637,677.11  
Investment, Identifier [Axis]: Kona Buyer, LLC, High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 8,413  
Fair value at ending balance [1],[2],[4]   $ 8,413
Interest [1],[2],[4]   4.75%
Interest [1],[2],[4]   10.10%
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 [2],[3],[4],[11],[28] 1,854  
Fair value at ending balance $ 1,891 [6],[9],[15],[24],[34] $ 1,854 [2],[3],[4],[11],[28]
Interest 6.25% [6],[9],[15],[24],[34] 6.25% [2],[3],[4],[11],[28]
Interest 10.30% [6],[9],[15],[24],[34] 10.40% [2],[3],[4],[11],[28]
Investment, Identifier [Axis]: Lambir Bidco Limited, Healthcare, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4] $ 1,587  
Fair value at ending balance $ 1,718 [9],[15] $ 1,587 [3],[4]
Investment, interest rate, paid in kind 12.00% [9],[15] 12.00% [3],[4]
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 [2],[3],[4],[11],[25] $ 659  
Fair value at ending balance $ 703 [6],[9],[15],[24],[33] $ 659 [2],[3],[4],[11],[25]
Interest 5.75% [6],[9],[15],[24],[33] 5.75% [2],[3],[4],[11],[25]
Interest 10.60% [6],[9],[15],[24],[33] 11.10% [2],[3],[4],[11],[25]
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 [2],[3],[4],[11],[25] $ 16  
Fair value at ending balance [2],[3],[4],[11],[25]   $ 16
Interest [2],[3],[4],[11],[25]   5.75%
Interest [2],[3],[4],[11],[25]   11.10%
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[33] $ 35  
Interest [9],[15],[24],[33] 5.75%  
Interest [9],[15],[24],[33] 10.60%  
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 10,096  
Fair value at ending balance $ 10,050 [15],[23],[24] $ 10,096 [1],[2],[4]
Interest 4.75% [15],[23],[24] 5.75% [1],[2],[4]
Interest 9.40% [15],[23],[24] 11.20% [1],[2],[4]
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 [4] $ 239  
Fair value at ending balance [4]   $ 239
Investment owned, balance (in shares) [4],[10],[12],[13]   81,739
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 179  
Investment owned, balance (in shares) [5],[7],[8],[15] 81,739.2  
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 400  
Fair value at ending balance [1],[2],[4],[11]   $ 400
Interest [1],[2],[4],[11]   5.75%
Interest [1],[2],[4],[11]   11.20%
Investment, Identifier [Axis]: LeadsOnline, LLC, Business Equipment & Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (11)  
Interest [6],[15],[23],[24] 6.00%  
Interest [6],[15],[23],[24] 11.50%  
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [17] $ 3,712  
Investment owned, balance (in shares) [5],[7],[8],[17] 55,198  
Investment, Identifier [Axis]: Learfield Communications, LLC, Broadcasting, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [24],[32] $ 5,456  
Interest [24],[32] 5.50%  
Interest [24],[32] 10.30%  
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 [2],[27] $ 5,311  
Fair value at ending balance [2],[27]   $ 5,311
Interest [2],[27]   5.50%
Interest [2],[27]   10.90%
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 [4],[18] 4,037  
Fair value at ending balance [4],[18]   $ 4,037
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   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 [4],[35],[61] 0  
Fair value at ending balance $ 0 [15],[46],[62] $ 0 [4],[35],[61]
Investment, interest rate, paid in kind 16.00% [15],[46],[62] 16.00% [4],[35],[61]
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[16] $ 2,675  
Fair value at ending balance $ 2,765 [14],[15],[23],[24] $ 2,675 [1],[2],[4],[16]
Interest 7.00% [14],[15],[23],[24] 7.00% [1],[2],[4],[16]
Interest 12.60% [14],[15],[23],[24] 12.70% [1],[2],[4],[16]
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Consumer Goods: Durable, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11],[16] $ (275)  
Fair value at ending balance [1],[2],[4],[11],[16]   $ (275)
Interest [1],[2],[4],[11],[16]   7.00%
Interest [1],[2],[4],[11],[16]   12.70%
Investment, Identifier [Axis]: LivTech Purchaser, Inc., Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 860  
Fair value at ending balance $ 862 [15],[23],[24] $ 860 [1],[2],[4]
Interest 5.00% [15],[23],[24] 5.00% [1],[2],[4]
Interest 10.40% [15],[23],[24] 10.60% [1],[2],[4]
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 [2],[16],[27] $ 1,274  
Fair value at ending balance [2],[16],[27]   $ 1,274
Interest [2],[16],[27]   4.75%
Interest [2],[16],[27]   10.30%
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 [2],[4],[27] 6,308  
Fair value at ending balance $ 7,572 [15],[23],[24] $ 6,308 [2],[4],[27]
Interest 1.00% [15],[23],[24] 1.00% [2],[4],[27]
Interest 6.50% [15],[23],[24] 6.30% [2],[4],[27]
Investment, interest rate, paid in kind 6.00% [15],[23],[24] 6.00% [2],[4],[27]
Investment, Identifier [Axis]: MB Purchaser, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 2,196  
Interest [6],[15],[24],[32] 4.75%  
Interest [6],[15],[24],[32] 9.90%  
Investment, Identifier [Axis]: MB Purchaser, LLC, Technology, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 68  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 66  
Investment, Identifier [Axis]: MB Purchaser, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ (5)  
Interest [6],[15],[24],[32] 4.75%  
Interest [6],[15],[24],[32] 9.90%  
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 4,133  
Fair value at ending balance $ 5,019 [6],[15],[23],[24] $ 4,133 [1],[2],[4],[11]
Interest 5.25% [6],[15],[23],[24] 5.50% [1],[2],[4],[11]
Interest 10.60% [6],[15],[23],[24] 11.00% [1],[2],[4],[11]
Investment, Identifier [Axis]: MC Group Ventures Corporation, Business Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[33] $ 4,094  
Interest [6],[15],[24],[33] 5.50%  
Interest [6],[15],[24],[33] 10.90%  
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 [4],[18] $ 778  
Fair value at ending balance $ 835 [15],[17] $ 778 [4],[18]
Investment owned, balance (in shares) 746.66 [5],[7],[8],[15],[17] 746.66 [4],[10],[12],[13],[18]
Investment, Identifier [Axis]: MI OpCo Holdings, Inc., Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [24],[32] $ 6,243  
Interest [24],[32] 7.25%  
Interest [24],[32] 11.80%  
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 [2],[4],[27] $ 901  
Fair value at ending balance $ 895 [15],[24],[32] $ 901 [2],[4],[27]
Interest 5.00% [15],[24],[32] 5.50% [2],[4],[27]
Interest 9.50% [15],[24],[32] 11.00% [2],[4],[27]
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 [4],[18] $ 82  
Fair value at ending balance $ 104 [15],[17] $ 82 [4],[18]
Investment owned, balance (in shares) 76,923 [5],[7],[8],[15],[17] 76,923 [4],[10],[12],[13],[18]
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 [47] $ 9,762 $ 7,149
Gross Additions [47],[48] 0 2,613
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 0 0
Fair value at ending balance [47] 9,762 9,762
Amount of Interest or Dividends Credited to Income [47],[50] $ 444 $ 587
Interest 4.50% 4.50%
Investment, interest rate, paid in kind 1.50% 1.50%
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 [47] $ 15,430 $ 9,675
Gross Additions [47],[48] 0 0
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] (8,396) 5,755
Fair value at ending balance [47] 7,034 15,430
Amount of Interest or Dividends Credited to Income [47],[50] $ 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 [3],[4],[61] $ 9,762  
Fair value at ending balance $ 9,762 [9],[15],[62] $ 9,762 [3],[4],[61]
Interest 4.50% [9],[15],[62] 4.50% [3],[4],[61]
Investment, interest rate, paid in kind 1.50% [9],[15],[62] 1.50% [3],[4],[61]
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 [3],[4],[18],[61] $ 15,430  
Fair value at ending balance $ 7,034 [9],[15],[17],[62] $ 15,430 [3],[4],[18],[61]
Investment owned, balance (in shares) 18,000 [5],[7],[8],[9],[15],[17],[62] 18,000 [3],[4],[10],[12],[13],[18],[61]
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 $ 24 $ 45
Gross Additions [48] 0 0
Gross Reductions [49] 0 (24)
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (10) 3
Fair value at ending balance 14 24
Amount of Interest or Dividends Credited to Income [50] $ 44 $ 95
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 [3],[18],[61] $ 24  
Fair value at ending balance $ 14 [9],[15],[17],[62] $ 24 [3],[18],[61]
Investment owned, balance (in shares) 1,831.4 [5],[7],[8],[9],[15],[17],[62] 1,831.4 [3],[10],[12],[13],[18],[61]
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 [3],[18],[61] $ 981  
Fair value at ending balance $ 556 [9],[15],[17],[62] $ 981 [3],[18],[61]
Investment owned, balance (in shares) 71,790.4 [5],[7],[8],[9],[15],[17],[62] 71,790.4 [3],[10],[12],[13],[18],[61]
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 $ 981 $ 1,793
Gross Additions [48] 0 0
Gross Reductions [49] 0 (940)
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (425) 128
Fair value at ending balance 556 981
Amount of Interest or Dividends Credited to Income [50] $ 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],[3],[16] $ 5,067  
Fair value at ending balance $ 5,083 [9],[14],[23] $ 5,067 [1],[3],[16]
Interest 9.03% [9],[14],[23] 9.03% [1],[3],[16]
Interest 14.30% [9],[14],[23] 14.40% [1],[3],[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 [3],[16] $ 8,181  
Fair value at ending balance 7,363 [9],[14] $ 8,181 [3],[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 [2],[3],[4],[11],[28] 1,777  
Fair value at ending balance $ 58 [9],[15],[24],[34],[46] $ 1,777 [2],[3],[4],[11],[28]
Interest 6.50% [9],[15],[24],[34],[46] 6.75% [2],[3],[4],[11],[28]
Interest 3.30% [9],[15],[24],[34],[46] 3.90% [2],[3],[4],[11],[28]
Investment, interest rate, paid in kind 6.80% [9],[15],[24],[34],[46] 6.80% [2],[3],[4],[11],[28]
Investment, Identifier [Axis]: Marmoutier Holding B.V., 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 [9],[15],[24],[34],[46] $ 413  
Interest [9],[15],[24],[34],[46] 6.50%  
Interest [9],[15],[24],[34],[46] 3.30%  
Investment, interest rate, paid in kind [9],[15],[24],[34],[46] 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 [2],[3],[4],[11],[28] $ 6  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 6
Interest [2],[3],[4],[11],[28]   5.75%
Interest [2],[3],[4],[11],[28]   3.90%
Investment, interest rate, paid in kind [2],[3],[4],[11],[28]   5.80%
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34],[46] $ (80)  
Interest [9],[15],[24],[34],[46] 5.75%  
Interest [9],[15],[24],[34],[46] 2.70%  
Investment, interest rate, paid in kind [9],[15],[24],[34],[46] 6.50%  
Investment, Identifier [Axis]: Marmoutier Holding B.V., Consumer Products, Super Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[46] $ 190  
Interest [9],[15],[24],[46] 6.00%  
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 10,462  
Fair value at ending balance [1],[2],[4]   $ 10,462
Interest [1],[2],[4]   5.50%
Interest [1],[2],[4]   11.00%
Investment, Identifier [Axis]: Marshall Excelsior Co., Capital Goods, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 1,914  
Fair value at ending balance [1],[2],[4],[11]   $ 1,914
Interest [1],[2],[4],[11]   5.50%
Interest [1],[2],[4],[11]   11.00%
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 2,764  
Fair value at ending balance $ 4,037 [15],[24],[52] $ 2,764 [1],[2],[4]
Interest 4.75% [15],[24],[52] 6.00% [1],[2],[4]
Interest 9.70% [15],[24],[52] 11.60% [1],[2],[4]
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 [2],[4],[36] $ 3,946  
Fair value at ending balance $ 1,803 [15],[23],[24] $ 3,946 [2],[4],[36]
Interest 4.75% [15],[23],[24] 6.00% [2],[4],[36]
Interest 9.40% [15],[23],[24] 11.20% [2],[4],[36]
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, Revolver 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[52] $ (12)  
Interest [6],[15],[24],[52] 4.75%  
Interest [6],[15],[24],[52] 9.70%  
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Containers, Packaging & Glass, Revolver 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (10)  
Interest [6],[15],[23],[24] 4.75%  
Interest [6],[15],[23],[24] 9.40%  
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 [2],[3],[40] $ 8,595  
Fair value at ending balance $ 9,581 [9],[24],[39] $ 8,595 [2],[3],[40]
Interest 4.75% [9],[24],[39] 6.00% [2],[3],[40]
Interest 9.70% [9],[24],[39] 11.40% [2],[3],[40]
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],[2] $ 3,708  
Fair value at ending balance $ 2,874 [23],[24] $ 3,708 [1],[2]
Interest 7.00% [23],[24] 7.00% [1],[2]
Interest 12.40% [23],[24] 12.50% [1],[2]
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Aerospace & Defense, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 205  
Investment, Identifier [Axis]: Megawatt Acquisitionco, 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 [15],[23],[24] $ 3,899  
Interest [15],[23],[24] 5.25%  
Interest [15],[23],[24] 9.90%  
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Aerospace & Defense, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 87  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 1,842  
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Aerospace & Defense, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 30  
Interest [6],[15],[23],[24] 5.25%  
Interest [6],[15],[23],[24] 9.90%  
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 [3],[4],[18] $ 128  
Fair value at ending balance $ 132 [9],[15],[17] $ 128 [3],[4],[18]
Investment owned, balance (in shares) 114.4 [5],[7],[8],[9],[15],[17] 114.4 [3],[4],[10],[12],[13],[18]
Investment, interest rate, paid in kind [3],[4],[18]   9.00%
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 [3],[4],[18] $ 51  
Fair value at ending balance [3],[4],[18]   $ 51
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   28,943.8
Investment, Identifier [Axis]: Mercell Holding AS, Technology, Class B Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[17] $ 25  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 28,943.8  
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 [2],[3],[4],[11],[63] $ 3,041  
Fair value at ending balance $ 2,957 [6],[9],[15],[24],[64] $ 3,041 [2],[3],[4],[11],[63]
Interest 5.50% [6],[9],[15],[24],[64] 5.50% [2],[3],[4],[11],[63]
Interest 10.10% [6],[9],[15],[24],[64] 10.10% [2],[3],[4],[11],[63]
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 [2],[3],[4],[11],[41] $ 7,784  
Fair value at ending balance $ 7,985 [6],[9],[15],[24],[42] $ 7,784 [2],[3],[4],[11],[41]
Interest 5.75% [6],[9],[15],[24],[42] 5.50% [2],[3],[4],[11],[41]
Interest 10.50% [6],[9],[15],[24],[42] 10.30% [2],[3],[4],[11],[41]
Investment, Identifier [Axis]: Moonlight Bidco Limited, Healthcare, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[18] $ 1,380  
Fair value at ending balance [3],[4],[18]   $ 1,380
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   107,714
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 [9],[15],[17] $ 197  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 10,590  
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 beginning balance [2],[3],[4],[11],[36] $ 1,832  
Fair value at ending balance $ 1,987 [6],[9],[15],[24],[37] $ 1,832 [2],[3],[4],[11],[36]
Interest 5.75% [6],[9],[15],[24],[37] 6.25% [2],[3],[4],[11],[36]
Interest 10.70% [6],[9],[15],[24],[37] 11.60% [2],[3],[4],[11],[36]
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 [2],[3],[4],[40] $ 1,670  
Fair value at ending balance $ 1,757 [9],[15],[24],[39] $ 1,670 [2],[3],[4],[40]
Interest 5.25% [9],[15],[24],[39] 5.25% [2],[3],[4],[40]
Interest 10.30% [9],[15],[24],[39] 10.70% [2],[3],[4],[40]
Investment, Identifier [Axis]: Music Reports, Inc., Media & Entertainment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 6,884  
Fair value at ending balance $ 6,500 [15],[23],[24] $ 6,884 [1],[2],[4]
Interest 6.25% [15],[23],[24] 6.00% [1],[2],[4]
Interest 11.50% [15],[23],[24] 11.50% [1],[2],[4]
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Equity Co Invest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 473  
Fair value at ending balance [4],[18]   $ 473
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   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 beginning balance [1],[2],[4],[11] 11,446  
Fair value at ending balance $ 11,880 [6],[15],[23],[24] $ 11,446 [1],[2],[4],[11]
Interest 5.75% [6],[15],[23],[24] 5.75% [1],[2],[4],[11]
Interest 10.40% [6],[15],[23],[24] 11.10% [1],[2],[4],[11]
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 463  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 472,512  
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 335  
Fair value at ending balance [1],[2],[4],[11]   $ 335
Interest [1],[2],[4],[11]   5.75%
Interest [1],[2],[4],[11]   11.10%
Investment, Identifier [Axis]: NAW Buyer LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 10.40%  
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 beginning balance [1],[2],[4] $ 6,204  
Fair value at ending balance $ 6,274 [15],[23],[24] $ 6,204 [1],[2],[4]
Interest 6.00% [15],[23],[24] 6.50% [1],[2],[4]
Interest 11.20% [15],[23],[24] 11.80% [1],[2],[4]
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 633  
Fair value at ending balance $ 569 [15],[17] $ 633 [4],[18]
Investment owned, balance (in shares) 639,510 [5],[7],[8],[15],[17] 639,510 [4],[10],[12],[13],[18]
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 417  
Fair value at ending balance [1],[2],[4],[11]   $ 417
Interest [1],[2],[4],[11]   6.50%
Interest [1],[2],[4],[11]   11.80%
Investment, Identifier [Axis]: NF Holdco, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 603  
Interest [6],[15],[23],[24] 6.00%  
Interest [6],[15],[23],[24] 11.20%  
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 [2],[4],[27] $ 4,655  
Fair value at ending balance [2],[4],[27]   $ 4,655
Interest [2],[4],[27]   4.00%
Interest [2],[4],[27]   9.50%
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 ending balance [6],[9],[15],[24],[29] $ 2,216  
Interest [6],[9],[15],[24],[29] 6.00%  
Interest [6],[9],[15],[24],[29] 9.30%  
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 [2],[3],[4],[11],[28] $ 2,175  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 2,175
Interest [2],[3],[4],[11],[28]   6.00%
Interest [2],[3],[4],[11],[28]   9.90%
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 [2],[3],[4],[56] 18,321  
Fair value at ending balance $ 19,219 [9],[15],[24],[42] $ 18,321 [2],[3],[4],[56]
Interest 5.50% [9],[15],[24],[42] 5.50% [2],[3],[4],[56]
Interest 9.90% [9],[15],[24],[42] 9.90% [2],[3],[4],[56]
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 [4],[18] $ 535  
Fair value at ending balance [4],[18]   $ 535
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   4,587.38
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 ending balance [15],[17] $ 567  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 4,587.38  
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 [4],[18] $ 229  
Fair value at ending balance [4],[18]   $ 229
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   509.71
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 ending balance [15],[17] $ 118  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 509.71  
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 5,562  
Fair value at ending balance $ 5,087 [15],[23],[24] $ 5,562 [1],[2],[4]
Interest 5.00% [15],[23],[24] 5.00% [1],[2],[4]
Interest 10.40% [15],[23],[24] 10.50% [1],[2],[4]
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (8)  
Fair value at ending balance [1],[2],[4],[11]   $ (8)
Interest [1],[2],[4],[11]   5.00%
Interest [1],[2],[4],[11]   10.50%
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Aerospace & Defense, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 10.40%  
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 ending balance [15],[24],[32] $ 2,933  
Interest [15],[24],[32] 4.50%  
Interest [15],[24],[32] 9.40%  
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 [2],[4],[27] $ 2,918  
Fair value at ending balance $ 2,639 [15],[24],[32] $ 2,918 [2],[4],[27]
Interest 4.50% [15],[24],[32] 2.00% [2],[4],[27]
Interest 9.40% [15],[24],[32] 7.40% [2],[4],[27]
Investment, interest rate, paid in kind [2],[4],[27]   3.00%
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[27] $ 2,620  
Fair value at ending balance [2],[4],[27]   $ 2,620
Interest [2],[4],[27]   5.00%
Interest [2],[4],[27]   10.40%
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 beginning balance [2],[3],[4],[11],[38] 2,090  
Fair value at ending balance $ 2,167 [6],[9],[15],[24],[34] $ 2,090 [2],[3],[4],[11],[38]
Interest 6.50% [6],[9],[15],[24],[34] 6.50% [2],[3],[4],[11],[38]
Interest 10.10% [6],[9],[15],[24],[34] 10.50% [2],[3],[4],[11],[38]
Investment, Identifier [Axis]: Next Holdco, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 7,340  
Interest [6],[15],[23],[24] 6.00%  
Interest [6],[15],[23],[24] 11.20%  
Investment, Identifier [Axis]: Next Holdco, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 6.00%  
Interest [6],[15],[23],[24] 11.20%  
Investment, Identifier [Axis]: Next Holdco, LLC,Technology,First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ 7,236  
Fair value at ending balance [2],[4],[11],[27]   $ 7,236
Interest [2],[4],[11],[27]   6.00%
Interest [2],[4],[11],[27]   11.30%
Investment, Identifier [Axis]: Next Holdco, LLC,Technology,Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] (11)  
Fair value at ending balance [2],[4],[11],[27]   $ (11)
Interest [2],[4],[11],[27]   6.00%
Interest [2],[4],[11],[27]   11.30%
Investment, Identifier [Axis]: Northstar Recycling, LLC, Environmental Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 2,434  
Fair value at ending balance $ 2,431 [15],[23],[24] $ 2,434 [1],[2],[4]
Interest 4.65% [15],[23],[24] 4.75% [1],[2],[4]
Interest 10.10% [15],[23],[24] 10.10% [1],[2],[4]
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 [2],[3],[4],[11],[25] $ 3,984  
Fair value at ending balance [2],[3],[4],[11],[25]   $ 3,984
Interest [2],[3],[4],[11],[25]   5.25%
Interest [2],[3],[4],[11],[25]   11.10%
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 [2],[4],[27] 5,485  
Fair value at ending balance $ 8,286 [15],[24],[32] $ 5,485 [2],[4],[27]
Interest 5.25% [15],[24],[32] 5.50% [2],[4],[27]
Interest 10.20% [15],[24],[32] 10.90% [2],[4],[27]
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 [4],[18] $ 276  
Fair value at ending balance [4],[18]   $ 276
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   210,920.11
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 567  
Investment owned, balance (in shares) [5],[7],[8],[15] 210,920.11  
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ (12)  
Fair value at ending balance [2],[4],[11],[27]   $ (12)
Interest [2],[4],[11],[27]   5.50%
Interest [2],[4],[11],[27]   10.90%
Investment, Identifier [Axis]: OA Buyer, Inc., Healthcare, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ (6)  
Interest [6],[15],[24],[32] 5.25%  
Interest [6],[15],[24],[32] 10.20%  
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 3,454  
Fair value at ending balance $ 3,548 [15],[24],[32] $ 3,454 [1],[2],[4]
Interest 5.00% [15],[24],[32] 5.00% [1],[2],[4]
Interest 9.90% [15],[24],[32] 10.50% [1],[2],[4]
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (47)  
Fair value at ending balance [1],[2],[4],[11]   $ (47)
Interest [1],[2],[4],[11]   5.00%
Interest [1],[2],[4],[11]   10.50%
Investment, Identifier [Axis]: OAC Holdings I Corp, Automotive, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 0  
Interest [6],[15],[24],[32] 5.00%  
Interest [6],[15],[24],[32] 9.90%  
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 [2],[3],[4],[28] $ 3,390  
Fair value at ending balance $ 3,475 [9],[15],[24],[29] $ 3,390 [2],[3],[4],[28]
Interest 5.50% [9],[15],[24],[29] 5.75% [2],[3],[4],[28]
Interest 8.90% [9],[15],[24],[29] 9.70% [2],[3],[4],[28]
Investment, Identifier [Axis]: ORTEC INTERNATIONAL NEWCO B.V. Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[28] $ 985  
Fair value at ending balance [2],[3],[4],[28]   $ 985
Interest [2],[3],[4],[28]   5.75%
Interest [2],[3],[4],[28]   9.70%
Investment, Identifier [Axis]: ORTEC INTERNATIONAL NEWCO B.V., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 1,001  
Interest [9],[15],[24],[29] 5.75%  
Interest [9],[15],[24],[29] 9.20%  
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 ending balance [15],[23],[24] $ 12,914  
Interest [15],[23],[24] 5.00%  
Interest [15],[23],[24] 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],[2],[4] $ 12,934  
Fair value at ending balance $ 994 [6],[15],[23],[24] $ 12,934 [1],[2],[4]
Interest 5.00% [6],[15],[23],[24] 6.00% [1],[2],[4]
Interest 10.20% [6],[15],[23],[24] 11.50% [1],[2],[4]
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 beginning balance [1],[2],[4],[11] $ (107)  
Fair value at ending balance [1],[2],[4],[11]   $ (107)
Interest [1],[2],[4],[11]   6.00%
Interest [1],[2],[4],[11]   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 beginning balance [1],[2],[4],[11] (22)  
Fair value at ending balance [1],[2],[4],[11]   $ (22)
Interest [1],[2],[4],[11]   6.00%
Interest [1],[2],[4],[11]   11.50%
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4] 174  
Fair value at ending balance $ 162 [15] $ 174 [4]
Investment owned, balance (in shares) 173,749 [5],[7],[8],[15] 173,749 [4],[10],[12],[13]
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (16)  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 10.20%  
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 0  
Fair value at ending balance $ 0 [15],[17] $ 0 [4],[18]
Investment owned, balance (in shares) 186.70 [5],[7],[8],[15],[17] 186.67 [4],[10],[12],[13],[18]
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4] $ 2,085  
Fair value at ending balance [4]   $ 2,085
Investment owned, balance (in shares) [4],[10],[12],[13]   243.81
Investment, interest rate, paid in kind [4]   15.00%
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 2,734  
Investment owned, balance (in shares) [5],[7],[8],[15] 243.80  
Investment, interest rate, paid in kind [15] 15.00%  
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Super Senior Takeback Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4] $ 549  
Fair value at ending balance $ 549 [15],[24] $ 549 [4]
Interest 10.00% [15],[24] 10.00% [4]
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Takeback Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4] $ 2,933  
Fair value at ending balance [4]   $ 2,933
Interest [4]   10.00%
Investment, Identifier [Axis]: Ocelot Holdco LLC, Construction Machinery, Takeback Term loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24] $ 2,933  
Interest [15],[24] 10.00%  
Investment, Identifier [Axis]: Ocular Therapeutix, Inc., Pharma-ceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[27] $ 3,812  
Fair value at ending balance [2],[3],[4],[27]   $ 3,812
Interest [2],[3],[4],[27]   6.75%
Interest [2],[3],[4],[27]   12.10%
Investment, Identifier [Axis]: Ocular Therapeutix, Inc., Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[32] $ 4,849  
Interest [9],[15],[24],[32] 6.75%  
Interest [9],[15],[24],[32] 11.90%  
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 [4],[16],[25] $ 3,691  
Fair value at ending balance $ 3,702 [14],[15],[32] $ 3,691 [4],[16],[25]
Interest 5.00% [14],[15],[32] 5.00% [4],[16],[25]
Interest 10.00% [14],[15],[32] 10.50% [4],[16],[25]
Investment, Identifier [Axis]: Omni Intermediate Holdings, LLC, Transportation, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 7,864  
Fair value at ending balance [1],[2],[4]   $ 7,864
Interest [1],[2],[4]   5.00%
Interest [1],[2],[4]   10.50%
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 [2],[3],[4],[25] 2,249  
Fair value at ending balance [2],[3],[4],[25]   $ 2,249
Interest [2],[3],[4],[25]   4.75%
Interest [2],[3],[4],[25]   10.20%
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 [2],[3],[4],[40] 2,918  
Fair value at ending balance $ 3,070 [9],[15],[24],[39] $ 2,918 [2],[3],[4],[40]
Interest 4.75% [9],[15],[24],[39] 4.75% [2],[3],[4],[40]
Interest 10.00% [9],[15],[24],[39] 9.90% [2],[3],[4],[40]
Investment, Identifier [Axis]: Origin 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 [9],[15],[24],[29] $ 331  
Interest [9],[15],[24],[29] 5.25%  
Interest [9],[15],[24],[29] 8.70%  
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 [2],[3],[4],[28] $ 326  
Fair value at ending balance $ 533 [9],[15],[23],[24] $ 326 [2],[3],[4],[28]
Interest 5.25% [9],[15],[23],[24] 5.25% [2],[3],[4],[28]
Interest 10.70% [9],[15],[23],[24] 9.20% [2],[3],[4],[28]
Investment, Identifier [Axis]: Origin Bidco Limited, Technology, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 531  
Fair value at ending balance [1],[2],[3],[4]   $ 531
Interest [1],[2],[3],[4]   5.25%
Interest [1],[2],[3],[4]   10.70%
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 [4] 44  
Fair value at ending balance [4]   $ 44
Investment owned, balance (in shares) [4],[10],[12],[13]   28.8
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 ending balance [15],[17] $ 50  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 28.8  
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 10,319  
Fair value at ending balance $ 2,940 [15],[23],[24] $ 10,319 [1],[2],[4],[11]
Interest 4.75% [15],[23],[24] 5.21% [1],[2],[4],[11]
Interest 10.00% [15],[23],[24] 10.70% [1],[2],[4],[11]
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 2,930  
Fair value at ending balance $ 4,341 [15],[23],[24] $ 2,930 [1],[2],[4],[11]
Interest 4.75% [15],[23],[24] 5.75% [1],[2],[4],[11]
Interest 10.00% [15],[23],[24] 11.20% [1],[2],[4],[11]
Investment, Identifier [Axis]: PDQ.Com Corporation, Business Equipment & Services, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 7,238  
Interest [6],[15],[23],[24] 4.75%  
Interest [6],[15],[23],[24] 10.00%  
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ 890  
Interest [6],[9],[15],[24],[29] 5.75%  
Interest [6],[9],[15],[24],[29] 9.30%  
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 [2],[3],[4],[11],[55] $ 820  
Fair value at ending balance $ 1,382 [9],[15],[23],[24] $ 820 [2],[3],[4],[11],[55]
Interest 5.75% [9],[15],[23],[24] 6.00% [2],[3],[4],[11],[55]
Interest 11.20% [9],[15],[23],[24] 9.90% [2],[3],[4],[11],[55]
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 [2],[3],[4],[27] $ 1,305  
Fair value at ending balance [2],[3],[4],[27]   $ 1,305
Interest [2],[3],[4],[27]   6.00%
Interest [2],[3],[4],[27]   11.40%
Investment, Identifier [Axis]: Panoche Energy Center LLC, Electric, First Lien Senior Secured Bond    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance $ 3,404  
Interest 6.90%  
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 [4] $ 4,224  
Fair value at ending balance [4]   $ 4,224
Interest [4]   6.90%
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), Health Care Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 2,864  
Interest [9],[15],[24],[29] 5.25%  
Interest [9],[15],[24],[29] 9.40%  
Investment, interest rate, paid in kind [9],[15],[24],[29] 0.80%  
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 [2],[3],[4],[38] $ 2,804  
Fair value at ending balance $ 1,497 [9],[15],[23],[24] $ 2,804 [2],[3],[4],[38]
Interest 5.25% [9],[15],[23],[24] 5.25% [2],[3],[4],[38]
Interest 9.90% [9],[15],[23],[24] 9.20% [2],[3],[4],[38]
Investment, interest rate, paid in kind [2],[3],[4],[38]   0.80%
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), Health Care Equipment, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 1,482  
Fair value at ending balance [1],[2],[3],[4]   $ 1,482
Interest [1],[2],[3],[4]   5.25%
Interest [1],[2],[3],[4]   10.60%
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 605  
Fair value at ending balance $ 606 [15],[24],[32] $ 605 [1],[2],[4],[11]
Interest 8.30% [15],[24],[32] 8.30% [1],[2],[4],[11]
Interest 13.60% [15],[24],[32] 13.60% [1],[2],[4],[11]
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 298  
Fair value at ending balance [4],[18]   $ 298
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   29,762
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Healthcare, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 250  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 29,762  
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), Diversified Financial Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 2,168  
Interest [9],[15],[24],[29] 6.75%  
Interest [9],[15],[24],[29] 12.30%  
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 [2],[3],[4],[28] $ 2,327  
Fair value at ending balance $ 2,586 [9],[15],[23],[24] $ 2,327 [2],[3],[4],[28]
Interest 6.75% [9],[15],[23],[24] 6.75% [2],[3],[4],[28]
Interest 12.30% [9],[15],[23],[24] 10.70% [2],[3],[4],[28]
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), Diversified Financial Services, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 2,804  
Fair value at ending balance [1],[2],[3],[4]   $ 2,804
Interest [1],[2],[3],[4]   6.75%
Interest [1],[2],[3],[4]   12.30%
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 ending balance [9],[15] $ 181  
Interest [9],[15] 5.40%  
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 ending balance [9],[15] $ 180  
Interest [9],[15] 5.90%  
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 ending balance [9],[15] $ 180  
Interest [9],[15] 8.50%  
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 ending balance [9],[15] $ 8,905  
Interest [9],[15] 11.40%  
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 [3],[4] $ 172  
Fair value at ending balance $ 179 [9],[15] $ 172 [3],[4]
Interest 4.70% [9],[15] 4.70% [3],[4]
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 [3],[4] $ 173  
Fair value at ending balance [3],[4]   $ 173
Interest [3],[4]   5.40%
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 [3],[4] 167  
Fair value at ending balance [3],[4]   $ 167
Interest [3],[4]   5.90%
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 [3],[4] 166  
Fair value at ending balance [3],[4]   $ 166
Interest [3],[4]   8.50%
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 [3],[4] 8,503  
Fair value at ending balance [3],[4]   $ 8,503
Interest [3],[4]   11.40%
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 [2],[3],[4],[56] 2,743  
Fair value at ending balance [2],[3],[4],[56]   $ 2,743
Interest [2],[3],[4],[56]   6.25%
Interest [2],[3],[4],[56]   10.70%
Investment, Identifier [Axis]: Permaconn BidCo Pty Ltd, Telecommunications, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[42] $ 2,837  
Interest [9],[15],[24],[42] 5.25%  
Interest [9],[15],[24],[42] 9.70%  
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 1,118  
Fair value at ending balance $ 960 [15],[23],[24] $ 1,118 [1],[2],[4]
Interest 4.75% [15],[23],[24] 4.75% [1],[2],[4]
Interest 9.50% [15],[23],[24] 10.20% [1],[2],[4]
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 [4] $ 1,285  
Fair value at ending balance $ 1,116 [15] $ 1,285 [4]
Investment owned, balance (in shares) 7,409 [5],[7],[8],[15] 7,409 [4],[10],[12],[13]
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Capital Equipment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 0  
Fair value at ending balance $ 0 [6],[15],[23],[24] $ 0 [1],[2],[4],[11]
Interest 4.75% [6],[15],[23],[24] 4.75% [1],[2],[4],[11]
Interest 9.50% [6],[15],[23],[24] 10.20% [1],[2],[4],[11]
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 50,498  
Fair value at ending balance $ 52,315 [15],[23],[24] $ 50,498 [1],[2],[4]
Interest 6.00% [15],[23],[24] 6.00% [1],[2],[4]
Interest 11.50% [15],[23],[24] 11.60% [1],[2],[4]
Investment, interest rate, paid in kind 4.00% [15],[23],[24] 4.00% [1],[2],[4]
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 [4],[18] $ 1,297  
Fair value at ending balance [4],[18]   $ 1,297
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   2.55830
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 ending balance [15],[17] $ 1,245  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 2.55830  
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 [4],[18] $ 438  
Fair value at ending balance [4],[18]   $ 438
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   0.86340
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 ending balance [15],[17] $ 420  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 0.86340  
Investment, Identifier [Axis]: Policy Services Company, LLC, Property & Casualty Insurance, Warrants - Class C    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 0.08880  
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 [4],[18] $ 0  
Fair value at ending balance [4],[18]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   0.08870
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 [4],[18] 125  
Fair value at ending balance [4],[18]   $ 125
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   0.24710
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 ending balance [15],[17] $ 120  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 0.24710  
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 beginning balance [4],[18] $ 0  
Fair value at ending balance $ 0 [15],[17] $ 0 [4],[18]
Investment owned, balance (in shares) 74 [5],[7],[8],[15],[17] 74 [4],[10],[12],[13],[18]
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 [2],[4],[16],[27] $ 936  
Fair value at ending balance $ 568 [14],[15],[24],[32] $ 936 [2],[4],[16],[27]
Interest 7.00% [14],[15],[24],[32] 7.00% [2],[4],[16],[27]
Interest 12.30% [14],[15],[24],[32] 12.40% [2],[4],[16],[27]
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, Research & Consulting Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 7,511  
Fair value at ending balance $ 9,979 [15],[23],[24] $ 7,511 [1],[2],[4]
Interest 6.25% [15],[23],[24] 6.75% [1],[2],[4]
Interest 12.20% [15],[23],[24] 12.50% [1],[2],[4]
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 [2],[3],[4],[11],[38] $ 9,031  
Fair value at ending balance $ 9,320 [6],[9],[15],[24],[29] $ 9,031 [2],[3],[4],[11],[38]
Interest 5.75% [6],[9],[15],[24],[29] 6.50% [2],[3],[4],[11],[38]
Interest 9.10% [6],[9],[15],[24],[29] 10.50% [2],[3],[4],[11],[38]
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 [2],[3],[4],[25] $ 2,778  
Fair value at ending balance $ 2,789 [9],[15],[24],[33] $ 2,778 [2],[3],[4],[25]
Interest 5.93% [9],[15],[24],[33] 5.25% [2],[3],[4],[25]
Interest 11.70% [9],[15],[24],[33] 11.00% [2],[3],[4],[25]
Investment, Identifier [Axis]: Pro-Vision Solutions 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 [15],[23],[24] $ 7,651  
Interest [15],[23],[24] 4.50%  
Interest [15],[23],[24] 9.30%  
Investment, Identifier [Axis]: Pro-Vision Solutions Holdings, LLC, High Tech Industries, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 236  
Investment owned, balance (in shares) [5],[7],[8],[15] 2,357.5  
Investment, Identifier [Axis]: Pro-Vision Solutions Holdings, LLC, High Tech Industries, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ (31)  
Interest [15],[23],[24] 4.50%  
Interest [15],[23],[24] 9.30%  
Investment, Identifier [Axis]: Process Equipment, Inc. (ProcessBarron), Industrial Air & Material Handling Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 5,462  
Fair value at ending balance $ 5,351 [15],[24],[33] $ 5,462 [1],[2],[4]
Interest 5.25% [15],[24],[33] 5.25% [1],[2],[4]
Interest 9.80% [15],[24],[33] 11.00% [1],[2],[4]
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 340  
Fair value at ending balance [4],[18]   $ 340
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   281
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 [15],[17] $ 325  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 beginning balance [1],[2],[4],[11] $ 5,293  
Fair value at ending balance $ 0 [6],[15],[23],[24] $ 5,293 [1],[2],[4],[11]
Interest 6.25% [6],[15],[23],[24] 6.25% [1],[2],[4],[11]
Interest 11.40% [6],[15],[23],[24] 11.60% [1],[2],[4],[11]
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 5,292  
Interest [15],[23],[24] 6.25%  
Interest [15],[23],[24] 11.40%  
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Electronics, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (6)  
Fair value at ending balance [1],[2],[4],[11]   $ (6)
Interest [1],[2],[4],[11]   6.25%
Interest [1],[2],[4],[11]   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 [6],[15],[23],[24] $ 439  
Interest [6],[15],[23],[24] 6.25%  
Interest [6],[15],[23],[24] 11.40%  
Investment, Identifier [Axis]: Professional Datasolutions, Inc. (PDI), Application Software, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 1,783  
Fair value at ending balance [1],[2],[4]   $ 1,783
Interest [1],[2],[4]   4.50%
Interest [1],[2],[4]   10.10%
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 [2],[4],[25] 1,635  
Fair value at ending balance $ 1,621 [15],[24],[32] $ 1,635 [2],[4],[25]
Interest 5.75% [15],[24],[32] 5.75% [2],[4],[25]
Interest 10.80% [15],[24],[32] 11.50% [2],[4],[25]
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 220  
Fair value at ending balance [4],[18]   $ 220
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   241,935.48
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 196  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 241,935.48  
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[25] $ 274  
Fair value at ending balance [2],[4],[11],[25]   $ 274
Interest [2],[4],[11],[25]   5.75%
Interest [2],[4],[11],[25]   11.50%
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 315  
Interest [6],[15],[24],[32] 5.75%  
Interest [6],[15],[24],[32] 10.80%  
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 [4] $ 73  
Fair value at ending balance [4]   $ 73
Interest [4]   8.00%
Investment, Identifier [Axis]: ProfitOptics, LLC, Technology, Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 73  
Interest [15] 8.00%  
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 [4],[16] $ 0  
Fair value at ending balance [4],[16]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[16]   1,668,106
Investment, Identifier [Axis]: Proppants Holding, LLC, Energy: Oil & Gas, LLC Units (1,506,254 units)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [14],[15] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[14],[15] 1,506,254  
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 [2],[3],[4],[11],[38] $ 1,630  
Fair value at ending balance $ 1,768 [9],[15],[24],[34] $ 1,630 [2],[3],[4],[11],[38]
Interest 6.75% [9],[15],[24],[34] 6.75% [2],[3],[4],[11],[38]
Interest 10.30% [9],[15],[24],[34] 10.80% [2],[3],[4],[11],[38]
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 [2],[3],[4],[38] $ 2,110  
Fair value at ending balance $ 2,115 [9],[15],[24],[34] $ 2,110 [2],[3],[4],[38]
Interest 6.50% [9],[15],[24],[34] 6.50% [2],[3],[4],[38]
Interest 9.70% [9],[15],[24],[34] 10.50% [2],[3],[4],[38]
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 [2],[3],[4],[30] $ 1,852  
Fair value at ending balance $ 1,902 [9],[15],[24],[65] $ 1,852 [2],[3],[4],[30]
Interest 3.75% [9],[15],[24],[65] 4.50% [2],[3],[4],[30]
Interest 8.10% [9],[15],[24],[65] 8.80% [2],[3],[4],[30]
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 64  
Fair value at ending balance [4],[18]   $ 64
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   303,030
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 [15],[17] $ 88  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 beginning balance [1],[2],[4] $ 592  
Fair value at ending balance $ 704 [15],[23],[24] $ 592 [1],[2],[4]
Interest 5.75% [15],[23],[24] 5.75% [1],[2],[4]
Interest 10.10% [15],[23],[24] 11.20% [1],[2],[4]
Investment, Identifier [Axis]: Qualified Industries, LLC, Consumer Cyclical, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 159  
Fair value at ending balance [4],[18]   $ 159
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   148
Investment, interest rate, paid in kind 10.00% [15],[17] 10.00% [4],[18]
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 [15],[17] $ 171  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 beginning balance [1],[2],[4],[11] $ (2)  
Fair value at ending balance $ (5) [6],[15],[23],[24] $ (2) [1],[2],[4],[11]
Interest 5.75% [6],[15],[23],[24] 5.75% [1],[2],[4],[11]
Interest 10.10% [6],[15],[23],[24] 11.20% [1],[2],[4],[11]
Investment, Identifier [Axis]: Questel Unite, Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 6,732  
Fair value at ending balance $ 7,052 [9],[15],[23],[24] $ 6,732 [1],[2],[3],[4]
Interest 6.25% [9],[15],[23],[24] 6.25% [1],[2],[3],[4]
Interest 10.80% [9],[15],[23],[24] 11.70% [1],[2],[3],[4]
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 [2],[4],[11],[25] $ 6,001  
Fair value at ending balance $ 6,145 [15],[24],[32] $ 6,001 [2],[4],[11],[25]
Interest 6.25% [15],[24],[32] 6.25% [2],[4],[11],[25]
Interest 11.10% [15],[24],[32] 11.60% [2],[4],[11],[25]
Investment, Identifier [Axis]: R1 Holdings, LLC, Transportation, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[25] $ 80  
Fair value at ending balance $ 126 [6],[15],[24],[32] $ 80 [2],[4],[11],[25]
Interest 6.25% [6],[15],[24],[32] 6.25% [2],[4],[11],[25]
Interest 11.10% [6],[15],[24],[32] 11.60% [2],[4],[11],[25]
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[16] $ 12,723  
Fair value at ending balance $ 12,715 [14],[15],[24],[32] $ 12,723 [1],[2],[4],[16]
Interest 6.75% [14],[15],[24],[32] 6.75% [1],[2],[4],[16]
Interest 11.70% [14],[15],[24],[32] 12.00% [1],[2],[4],[16]
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11],[16] $ 778  
Fair value at ending balance [1],[2],[4],[11],[16]   $ 778
Interest [1],[2],[4],[11],[16]   6.75%
Interest [1],[2],[4],[11],[16]   12.00%
Investment, Identifier [Axis]: RA Outdoors, LLC, High Tech Industries, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [14],[15],[24],[32] $ 1,221  
Interest [14],[15],[24],[32] 6.75%  
Interest [14],[15],[24],[32] 11.70%  
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24],[29],[46] $ 6,428  
Interest [15],[24],[29],[46] 5.00%  
Interest [15],[24],[29],[46] 8.70%  
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 [2],[4],[28] $ 9,498  
Fair value at ending balance $ 1,319 [15],[23],[24],[46] $ 9,498 [2],[4],[28]
Interest 8.00% [15],[23],[24],[46] 5.00% [2],[4],[28]
Interest 13.50% [15],[23],[24],[46] 8.90% [2],[4],[28]
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 1,949  
Fair value at ending balance [1],[2],[4]   $ 1,949
Interest [1],[2],[4]   5.00%
Interest [1],[2],[4]   10.40%
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Air Freight & Logistics, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 157  
Interest [6],[15],[23],[24] 8.00%  
Interest [6],[15],[23],[24] 12.70%  
Investment, Identifier [Axis]: RPX Corporation, Research & Consulting Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,732  
Fair value at ending balance $ 26,504 [15],[23],[24] $ 4,732 [1],[2],[4]
Interest 5.50% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.70% [15],[23],[24] 11.00% [1],[2],[4]
Investment, Identifier [Axis]: RPX Corporation, Research & Consulting Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ (45)  
Interest [15],[23],[24] 5.50%  
Interest [15],[23],[24] 10.70%  
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 [4],[16],[18] $ 0  
Fair value at ending balance [4],[16],[18]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[16],[18]   145.347
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 ending balance [14],[15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 145.347  
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 [4],[16],[18] $ 0  
Fair value at ending balance $ 0 [14],[15],[17] $ 0 [4],[16],[18]
Investment owned, balance (in shares) 145.347 [5],[7],[8],[14],[15],[17] 145.347 [4],[10],[12],[13],[16],[18]
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 [4],[16],[18] $ 73  
Fair value at ending balance [4],[16],[18]   $ 73
Investment owned, balance (in shares) [4],[10],[12],[13],[16],[18]   7,844.03
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 ending balance [14],[15],[17] $ 61  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 7,844.03  
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 [4],[16],[18] $ 0  
Fair value at ending balance [4],[16],[18]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[16],[18]   153
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 ending balance [14],[15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 153  
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[16] $ 8,717  
Fair value at ending balance [1],[2],[4],[16]   $ 8,717
Interest [1],[2],[4],[16]   7.75%
Interest [1],[2],[4],[16]   13.10%
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Consumer Goods: Durable, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11],[16] 524  
Fair value at ending balance [1],[2],[4],[11],[16]   $ 524
Interest [1],[2],[4],[11],[16]   7.75%
Interest [1],[2],[4],[11],[16]   13.10%
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 ending balance [6],[15],[23],[24] $ 11,035  
Interest [6],[15],[23],[24] 6.25%  
Interest [6],[15],[23],[24] 10.90%  
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 577  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 5,333  
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 431  
Interest [6],[15],[23],[24] 6.25%  
Interest [6],[15],[23],[24] 10.90%  
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 9,890  
Fair value at ending balance [1],[2],[4],[11]   $ 9,890
Interest [1],[2],[4],[11]   6.50%
Interest [1],[2],[4],[11]   11.90%
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 [4],[18] 570  
Fair value at ending balance [4],[18]   $ 570
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   5,333
Investment, Identifier [Axis]: Randys Holdings, Inc., Automobile Manufacturers. Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 505  
Fair value at ending balance [1],[2],[4],[11]   $ 505
Interest [1],[2],[4],[11]   6.50%
Interest [1],[2],[4],[11]   11.90%
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 11,442  
Fair value at ending balance $ 11,324 [15],[23],[24] $ 11,442 [1],[2],[4]
Interest 6.00% [15],[23],[24] 6.00% [1],[2],[4]
Interest 11.50% [15],[23],[24] 11.40% [1],[2],[4]
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 [4],[18] $ 103  
Fair value at ending balance [4],[18]   $ 103
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   187,235
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Technology, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 67  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 187,235  
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Home Furnishings, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,167  
Fair value at ending balance $ 4,239 [15],[23],[24] $ 4,167 [1],[2],[4]
Interest 5.50% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.70% [15],[23],[24] 11.00% [1],[2],[4]
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 [4],[18] $ 67  
Fair value at ending balance [4],[18]   $ 67
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   197,368.42
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 ending balance [15],[17] $ 69  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 202,393.6  
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Banking, Finance, Insurance & Real Estate, Common Stock ($38,571 shares)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [14],[15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 38,571  
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Banking, Finance, Insurance & Real Estate, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[16] $ 762  
Fair value at ending balance [1],[2],[4],[16]   $ 762
Interest [1],[2],[4],[16]   8.00%
Interest [1],[2],[4],[16]   13.60%
Investment, Identifier [Axis]: Resonetics, LLC, Health Care Equipment, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 3,991  
Fair value at ending balance [1],[2],[4]   $ 3,991
Interest [1],[2],[4]   7.00%
Interest [1],[2],[4]   12.60%
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 beginning balance [3],[4],[11] 29,586  
Fair value at ending balance 29,926 [9],[15] $ 29,586 [3],[4],[11]
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 [2],[3],[4],[28] 2,078  
Fair value at ending balance $ 2,111 [9],[15],[24],[29] $ 2,078 [2],[3],[4],[28]
Interest 6.25% [9],[15],[24],[29] 6.25% [2],[3],[4],[28]
Interest 9.60% [9],[15],[24],[29] 10.20% [2],[3],[4],[28]
Investment, Identifier [Axis]: Rocade Holdings LLC, Common LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] $ 844 $ 0
Gross Additions [19],[20] 0 0
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] 232 844
Fair value at ending balance [19] 1,076 844
Amount of Interest or Dividends Credited to Income [19],[22] $ 0 $ 0
Investment owned, balance (in shares) 23.8 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 beginning balance [4],[18] $ 844  
Fair value at ending balance [4],[18]   $ 844
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   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 [15],[17] $ 1,076  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 beginning balance [1],[4],[11] $ 73,113  
Fair value at ending balance [1],[4],[11]   $ 73,113
Interest [1],[4],[11]   6.00%
Investment owned, balance (in shares) [1],[4],[10],[11],[12],[13]   67,500
Investment, interest rate, paid in kind [1],[4],[11]   11.30%
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 [6],[15],[23] $ 79,504  
Interest [6],[15],[23] 6.00%  
Investment owned, balance (in shares) [5],[6],[7],[8],[15],[23] 67,500  
Investment, interest rate, paid in kind [6],[15],[23] 11.00%  
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 [19] $ 73,113 $ 0
Gross Additions [19],[20] 6,380 73,113
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] 11 0
Fair value at ending balance [19] 79,504 73,113
Amount of Interest or Dividends Credited to Income [19],[22] $ 6,380 $ 5,612
Interest 6.00% 6.00%
Investment owned, balance (in shares) 67,500 67,500
Investment, interest rate, paid in kind 11.00% 11.30%
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 beginning balance [4],[18] $ 1,534  
Fair value at ending balance [4],[18]   $ 1,534
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   233,871
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[27] 6,422  
Fair value at ending balance $ 6,426 [15],[23],[24] $ 6,422 [2],[4],[27]
Interest 5.50% [15],[23],[24] 7.50% [2],[4],[27]
Interest 10.70% [15],[23],[24] 12.90% [2],[4],[27]
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 [15],[17] $ 1,548  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 233,871  
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ (30)  
Fair value at ending balance [2],[4],[11],[27]   $ (30)
Interest [2],[4],[11],[27]   7.50%
Interest [2],[4],[11],[27]   12.90%
Investment, Identifier [Axis]: Rock Labor LLC, Media: Diversified & Production, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (22)  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.70%  
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 7,164  
Fair value at ending balance $ 8,083 [15],[23],[24] $ 7,164 [1],[2],[4],[11]
Interest 5.50% [15],[23],[24] 5.50% [1],[2],[4],[11]
Interest 10.60% [15],[23],[24] 10.90% [1],[2],[4],[11]
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 388  
Fair value at ending balance [1],[2],[4],[11]   $ 388
Interest [1],[2],[4],[11]   5.50%
Interest [1],[2],[4],[11]   10.90%
Investment, Identifier [Axis]: Royal Buyer, LLC, Industrial Other, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (9)  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.60%  
Investment, Identifier [Axis]: Ruffalo Noel Levitz, LLC, Media Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 9,241  
Fair value at ending balance $ 8,687 [15],[23],[24] $ 9,241 [1],[2],[4]
Interest 2.25% [15],[23],[24] 6.00% [1],[2],[4]
Interest 7.00% [15],[23],[24] 11.40% [1],[2],[4]
Investment, interest rate, paid in kind 4.30% [15],[23],[24] 0.50% [1],[2],[4]
Investment, Identifier [Axis]: Russell Investments US Institutional Holdco, Inc., Capital Markets, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 494  
Interest [15],[23],[24] 5.00%  
Interest [15],[23],[24] 8.80%  
Investment, interest rate, paid in kind [15],[23],[24] 1.50%  
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 13,442  
Fair value at ending balance $ 13,522 [6],[15],[24],[32] $ 13,442 [1],[2],[4],[11]
Interest 5.00% [6],[15],[24],[32] 6.75% [1],[2],[4],[11]
Interest 9.80% [6],[15],[24],[32] 12.10% [1],[2],[4],[11]
Investment, Identifier [Axis]: SBP Holdings LP, Industrial Other, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (19)  
Fair value at ending balance [1],[2],[4],[11]   $ (19)
Interest [1],[2],[4],[11]   6.75%
Interest [1],[2],[4],[11]   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 [6],[15],[23],[24] $ 488  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 9.80%  
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 [2],[4],[11],[27] $ 6,463  
Fair value at ending balance $ 6,604 [6],[15],[23],[24] $ 6,463 [2],[4],[11],[27]
Interest 5.75% [6],[15],[23],[24] 5.75% [2],[4],[11],[27]
Interest 10.50% [6],[15],[23],[24] 11.10% [2],[4],[11],[27]
Investment, Identifier [Axis]: SN BUYER, LLC, Health Care Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 10,592  
Fair value at ending balance [1],[2],[4]   $ 10,592
Interest [1],[2],[4]   5.75%
Interest [1],[2],[4]   11.20%
Investment, Identifier [Axis]: SPATCO Energy Solutions, LLC, Automotive, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 274  
Investment owned, balance (in shares) [5],[7],[8],[15] 274,229  
Investment, Identifier [Axis]: SPATCO Energy Solutions, LLC, Automotive, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 6,787  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 10.30%  
Investment, Identifier [Axis]: SPATCO Energy Solutions, LLC, Automotive, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (24)  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 10.30%  
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 [2],[3],[4],[11],[36] $ 3,416  
Fair value at ending balance $ 4,678 [6],[9],[15],[24],[37] $ 3,416 [2],[3],[4],[11],[36]
Interest 6.00% [6],[9],[15],[24],[37] 6.00% [2],[3],[4],[11],[36]
Interest 11.10% [6],[9],[15],[24],[37] 11.30% [2],[3],[4],[11],[36]
Investment, Identifier [Axis]: SSCP Spring Bidco 3 Limited, Healthcare, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[40] $ 947  
Fair value at ending balance $ 1,005 [9],[15],[24],[39] $ 947 [2],[3],[4],[40]
Interest 6.50% [9],[15],[24],[39] 6.50% [2],[3],[4],[40]
Interest 11.70% [9],[15],[24],[39] 11.70% [2],[3],[4],[40]
Investment, Identifier [Axis]: SVI International LLC, Automotive, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 627  
Interest [6],[15],[23],[24] 6.75%  
Interest [6],[15],[23],[24] 12.10%  
Investment, Identifier [Axis]: SVI International LLC, Automotive, LLC Units ($207,921 units)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 206  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 207,921  
Investment, Identifier [Axis]: SVI International LLC, Automotive, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (1)  
Interest [6],[15],[23],[24] 6.75%  
Interest [6],[15],[23],[24] 12.10%  
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Non-durable Consumer Goods, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 11,567  
Fair value at ending balance $ 14,703 [15],[23],[24] $ 11,567 [1],[2],[4]
Interest 5.25% [15],[23],[24] 6.00% [1],[2],[4]
Interest 10.30% [15],[23],[24] 11.50% [1],[2],[4]
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 [4],[18] $ 468  
Fair value at ending balance [4],[18]   $ 468
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   378.7
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 ending balance [15],[17] $ 500  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 378.7  
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 1,546  
Interest [9],[15],[24],[29] 6.75%  
Interest [9],[15],[24],[29] 10.50%  
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 [2],[3],[4],[11],[28] $ 2,585  
Fair value at ending balance $ 2,411 [6],[9],[15],[24],[29] $ 2,585 [2],[3],[4],[11],[28]
Interest 5.75% [6],[9],[15],[24],[29] 5.50% [2],[3],[4],[11],[28]
Interest 9.50% [6],[9],[15],[24],[29] 9.40% [2],[3],[4],[11],[28]
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 [2],[3],[4],[60] $ 3,357  
Fair value at ending balance $ 2,121 [9],[15],[24],[66] $ 3,357 [2],[3],[4],[60]
Interest 5.75% [9],[15],[24],[66] 5.50% [2],[3],[4],[60]
Interest 7.20% [9],[15],[24],[66] 7.20% [2],[3],[4],[60]
Investment, Identifier [Axis]: Sanoptis S.A.R.L., Healthcare & Pharmaceuticals, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[66] $ 913  
Interest [9],[15],[24],[66] 6.75%  
Interest [9],[15],[24],[66] 8.20%  
Investment, Identifier [Axis]: Sansidor BV, Services: Business, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[23],[24] $ 573  
Interest [9],[15],[23],[24] 5.25%  
Interest [9],[15],[23],[24] 8.70%  
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 1,759  
Fair value at ending balance $ 1,609 [15],[23],[24] $ 1,759 [1],[2],[4]
Interest 5.50% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.90% [15],[23],[24] 10.90% [1],[2],[4]
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 48  
Fair value at ending balance [1],[2],[4],[11]   $ 48
Interest [1],[2],[4],[11]   5.50%
Interest [1],[2],[4],[11]   10.90%
Investment, Identifier [Axis]: Scaled Agile, Inc., Research & Consulting Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 302  
Interest [15],[23],[24] 5.50%  
Interest [15],[23],[24] 10.90%  
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 ending balance [9],[15],[24],[29] $ 3,509  
Interest [9],[15],[24],[29] 5.50%  
Interest [9],[15],[24],[29] 9.00%  
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 beginning balance [2],[3],[4],[28] $ 3,480  
Fair value at ending balance $ 436 [9],[15],[23],[24] $ 3,480 [2],[3],[4],[28]
Interest 5.50% [9],[15],[23],[24] 5.75% [2],[3],[4],[28]
Interest 10.90% [9],[15],[23],[24] 9.70% [2],[3],[4],[28]
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 beginning balance [1],[2],[3],[4] $ 437  
Fair value at ending balance [1],[2],[3],[4]   $ 437
Interest [1],[2],[3],[4]   5.75%
Interest [1],[2],[3],[4]   11.10%
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[28] 410  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 410
Interest [2],[3],[4],[11],[28]   5.75%
Interest [2],[3],[4],[11],[28]   9.70%
Investment, Identifier [Axis]: Scout Bidco B.V., Diversified Manufacturing, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ (22)  
Interest [6],[9],[15],[24],[29] 5.50%  
Interest [6],[9],[15],[24],[29] 9.00%  
Investment, Identifier [Axis]: Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[39] $ 2,012  
Interest [9],[15],[24],[39] 10.50%  
Investment, interest rate, paid in kind [9],[15],[24],[39] 15.70%  
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 [47] $ 3,866 $ 0
Gross Additions [47],[48] 0 3,840
Gross Reductions [47],[49] 0 (22)
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 40 48
Fair value at ending balance [47] 3,906 3,866
Amount of Interest or Dividends Credited to Income [47],[50] $ 288 $ 168
Interest 6.00% 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 [47] $ 6,328 $ 6,020
Gross Additions [47],[48] 158 308
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 0 0
Fair value at ending balance [47] 6,486 6,328
Amount of Interest or Dividends Credited to Income [47],[50] $ 243 $ 309
Investment, interest rate, paid in kind 5.00% 5.00%
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 [47] $ 311 $ 575
Gross Additions [47],[48] 0 0
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 95 (264)
Fair value at ending balance [47] 406 311
Amount of Interest or Dividends Credited to Income [47],[50] $ 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 [47] $ 29,080 $ 53,728
Gross Additions [47],[48] 0 0
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 8,896 (24,648)
Fair value at ending balance [47] 37,976 29,080
Amount of Interest or Dividends Credited to Income [47],[50] $ 0 $ 0
Investment owned, balance (in shares) 1,236 1,236
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 [47] $ 10,867 $ 10,534
Gross Additions [47],[48] 324 333
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 0 0
Fair value at ending balance [47] 11,191 10,867
Amount of Interest or Dividends Credited to Income [47],[50] $ 185 $ 379
Investment, interest rate, paid in kind 3.10% 3.10%
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 [47] $ 2,236 $ 2,015
Gross Additions [47],[48] 209 154
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 26 67
Fair value at ending balance [47] 2,471 2,236
Amount of Interest or Dividends Credited to Income [47],[50] $ 167 $ 374
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 [3],[4],[61] $ 6,328  
Fair value at ending balance $ 6,486 [9],[15],[62] $ 6,328 [3],[4],[61]
Investment, interest rate, paid in kind 5.00% [9],[15],[62] 5.00% [3],[4],[61]
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 [3],[4],[18],[61] $ 311  
Fair value at ending balance [3],[4],[18],[61]   $ 311
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18],[61]   17,100
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 ending balance [9],[15],[17],[62] $ 406  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17],[62] 17,100  
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 [3],[4],[18],[61] $ 29,080  
Fair value at ending balance [3],[4],[18],[61]   $ 29,080
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18],[61]   1,236
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 ending balance [9],[15],[17],[62] $ 37,976  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17],[62] 1,236  
Investment, Identifier [Axis]: Security Holdings B.V., Electrical Engineering, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[11],[61] $ 3,866  
Fair value at ending balance $ 3,906 [6],[9],[15],[62] $ 3,866 [3],[4],[11],[61]
Interest 6.00% [6],[9],[15],[62] 6.00% [3],[4],[11],[61]
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 [3],[4],[61] $ 10,867  
Fair value at ending balance $ 11,191 [9],[15],[62] $ 10,867 [3],[4],[61]
Investment, interest rate, paid in kind 3.10% [9],[15],[62] 3.10% [3],[4],[61]
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 ending balance [6],[9],[15],[62] $ 2,471  
Interest [6],[9],[15],[62] 6.00%  
Investment, interest rate, paid in kind [6],[9],[15],[62] 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 beginning balance [3],[4],[11],[61] $ 2,236  
Fair value at ending balance [3],[4],[11],[61]   $ 2,236
Interest [3],[4],[11],[61]   6.00%
Investment, interest rate, paid in kind [3],[4],[11],[61]   9.00%
Investment, Identifier [Axis]: Sereni Capital NV, Consumer Cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[34] $ 978  
Interest [9],[15],[24],[34] 6.00%  
Interest [9],[15],[24],[34] 9.80%  
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 [2],[3],[4],[38] $ 2,522  
Fair value at ending balance $ 1,643 [9],[15],[24],[34] $ 2,522 [2],[3],[4],[38]
Interest 6.75% [9],[15],[24],[34] 6.25% [2],[3],[4],[38]
Interest 10.50% [9],[15],[24],[34] 10.30% [2],[3],[4],[38]
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 beginning balance [4],[18] $ 791  
Fair value at ending balance [4],[18]   $ 791
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   109,127
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Home Furnishings, Common Stock (109,127 shares)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [17] $ 611  
Investment owned, balance (in shares) [5],[7],[8],[17] 109,127  
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 [9],[15],[17] $ 5,448  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[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 [9],[15],[23],[24] $ 34,710  
Interest [9],[15],[23],[24] 6.00%  
Interest [9],[15],[23],[24] 11.50%  
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 [3],[4],[18] $ 1,548  
Fair value at ending balance [3],[4],[18]   $ 1,548
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   1,200,000
Investment, Identifier [Axis]: Shelf Bidco Ltd., Other Financial, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] 34,019  
Fair value at ending balance [1],[2],[3],[4]   $ 34,019
Interest [1],[2],[3],[4]   6.00%
Interest [1],[2],[3],[4]   11.70%
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 beginning balance [3],[16] 39,172  
Fair value at ending balance 41,297 [9],[14],[15] $ 39,172 [3],[16]
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 39,172 37,950
Gross Additions [20] 0 0
Gross Reductions [21] 0 (1,780)
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) 2,125 3,002
Fair value at ending balance 41,297 39,172
Amount of Interest or Dividends Credited to Income [22] 1,558 5,655
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 beginning balance [2],[3],[4],[11],[38] 1,822  
Fair value at ending balance $ 1,857 [6],[9],[15],[24],[34] $ 1,822 [2],[3],[4],[11],[38]
Interest 6.00% [6],[9],[15],[24],[34] 6.00% [2],[3],[4],[11],[38]
Interest 9.30% [6],[9],[15],[24],[34] 9.90% [2],[3],[4],[11],[38]
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 288  
Fair value at ending balance [4],[18]   $ 288
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   275
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 [15],[17] $ 431  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 beginning balance [1],[2],[4],[11] $ 9,332  
Fair value at ending balance $ 9,537 [15],[24],[33] $ 9,332 [1],[2],[4],[11]
Interest 5.75% [15],[24],[33] 6.25% [1],[2],[4],[11]
Interest 11.10% [15],[24],[33] 11.60% [1],[2],[4],[11]
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24],[33] $ 3,440  
Interest [15],[24],[33] 5.75%  
Interest [15],[24],[33] 11.10%  
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (38)  
Fair value at ending balance [1],[2],[4],[11]   $ (38)
Interest [1],[2],[4],[11]   6.25%
Interest [1],[2],[4],[11]   11.60%
Investment, Identifier [Axis]: SmartShift Group, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[33] $ 0  
Interest [6],[15],[24],[33] 5.75%  
Interest [6],[15],[24],[33] 11.10%  
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 [2],[4],[27] $ 10,466  
Fair value at ending balance $ 10,464 [15],[24],[32] $ 10,466 [2],[4],[27]
Interest 4.50% [15],[24],[32] 4.50% [2],[4],[27]
Interest 9.40% [15],[24],[32] 9.90% [2],[4],[27]
Investment, Identifier [Axis]: Smartling, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ (12)  
Fair value at ending balance [2],[4],[11],[27]   $ (12)
Interest [2],[4],[11],[27]   4.50%
Interest [2],[4],[11],[27]   9.90%
Investment, Identifier [Axis]: Smartling, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 0  
Interest [6],[15],[24],[32] 4.50%  
Interest [6],[15],[24],[32] 9.40%  
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 4,126  
Interest [15],[23],[24] 5.50%  
Interest [15],[23],[24] 10.90%  
Investment, interest rate, paid in kind [15],[23],[24] 1.00%  
Investment, Identifier [Axis]: Smile Brands Group Inc., Health Care Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,533  
Fair value at ending balance $ 558 [15],[23],[24] $ 4,533 [1],[2],[4]
Interest 5.50% [15],[23],[24] 4.50% [1],[2],[4]
Interest 10.90% [15],[23],[24] 10.00% [1],[2],[4]
Investment, interest rate, paid in kind 1.00% [15],[23],[24] 1.00% [1],[2],[4]
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 [3],[4] $ 8,175  
Fair value at ending balance [3],[4]   $ 8,175
Investment, interest rate, paid in kind [3],[4]   9.50%
Investment, Identifier [Axis]: Solo Buyer, L.P., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 15,140  
Fair value at ending balance $ 14,727 [15],[23],[24] $ 15,140 [1],[2],[4]
Interest 6.25% [15],[23],[24] 6.25% [1],[2],[4]
Interest 11.50% [15],[23],[24] 11.70% [1],[2],[4]
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 [4],[18] $ 382  
Fair value at ending balance [4],[18]   $ 382
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   516,399
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 [15],[17] $ 325  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 beginning balance [1],[2],[4],[11] $ 615  
Fair value at ending balance $ 315 [6],[15],[23],[24] $ 615 [1],[2],[4],[11]
Interest 6.25% [6],[15],[23],[24] 6.25% [1],[2],[4],[11]
Interest 11.50% [6],[15],[23],[24] 11.70% [1],[2],[4],[11]
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 [3],[16],[18] $ 579  
Fair value at ending balance 138 [9],[14],[17] $ 579 [3],[16],[18]
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] 1,858  
Fair value at ending balance $ 1,625 [6],[15],[24],[33] $ 1,858 [1],[2],[4],[11]
Interest 5.25% [6],[15],[24],[33] 5.00% [1],[2],[4],[11]
Interest 9.50% [6],[15],[24],[33] 10.30% [1],[2],[4],[11]
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[24],[33] $ 421  
Interest [15],[24],[33] 5.25%  
Interest [15],[24],[33] 9.50%  
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Other Utility, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 62  
Fair value at ending balance $ (2) [6],[15],[24],[33] $ 62 [1],[2],[4],[11]
Interest 5.25% [6],[15],[24],[33] 5.00% [1],[2],[4],[11]
Interest 9.50% [6],[15],[24],[33] 10.30% [1],[2],[4],[11]
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 [2],[4],[11],[27] $ 11,461  
Fair value at ending balance $ 11,114 [6],[15],[23],[24] $ 11,461 [2],[4],[11],[27]
Interest 6.00% [6],[15],[23],[24] 5.50% [2],[4],[11],[27]
Interest 11.10% [6],[15],[23],[24] 10.90% [2],[4],[11],[27]
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 [2],[4],[11],[27] $ (21)  
Fair value at ending balance $ (48) [6],[15],[23],[24] $ (21) [2],[4],[11],[27]
Interest 6.00% [6],[15],[23],[24] 5.50% [2],[4],[11],[27]
Interest 11.10% [6],[15],[23],[24] 10.90% [2],[4],[11],[27]
Investment, Identifier [Axis]: Springbrook Software (SBRK Intermediate, Inc.), Enterprise Software & Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 13,719  
Fair value at ending balance [1],[2],[4]   $ 13,719
Interest [1],[2],[4]   5.75%
Interest [1],[2],[4]   11.00%
Investment, Identifier [Axis]: Springbrook Software (SBRK Intermediate, Inc.), Enterprise Software & Services, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 2,791  
Fair value at ending balance [1],[2],[4]   $ 2,791
Interest [1],[2],[4]   6.50%
Interest [1],[2],[4]   12.00%
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 [2],[3],[4],[25] 2,490  
Fair value at ending balance $ 2,500 [9],[15],[24],[33] $ 2,490 [2],[3],[4],[25]
Interest 6.25% [9],[15],[24],[33] 6.00% [2],[3],[4],[25]
Interest 11.20% [9],[15],[24],[33] 11.50% [2],[3],[4],[25]
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 12,825  
Fair value at ending balance $ 17,720 [6],[15],[23],[24] $ 12,825 [1],[2],[4]
Interest 5.50% [6],[15],[23],[24] 5.50% [1],[2],[4]
Interest 10.10% [6],[15],[23],[24] 10.90% [1],[2],[4]
Investment, Identifier [Axis]: Superjet Buyer, LLC, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 444  
Fair value at ending balance $ 201 [6],[15],[23],[24] $ 444 [1],[2],[4],[11]
Interest 5.50% [6],[15],[23],[24] 5.50% [1],[2],[4],[11]
Interest 10.10% [6],[15],[23],[24] 10.90% [1],[2],[4],[11]
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 [4] $ 8,788  
Fair value at ending balance $ 9,773 [15] $ 8,788 [4]
Investment owned, balance (in shares) 7,575,758 [5],[7],[8],[15] 7,575,758 [4],[10],[12],[13]
Investment, interest rate, paid in kind 12.50% [15] 12.50% [4]
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 [2],[3],[4],[11],[27] $ 1,997  
Fair value at ending balance [2],[3],[4],[11],[27]   $ 1,997
Interest [2],[3],[4],[11],[27]   5.50%
Interest [2],[3],[4],[11],[27]   11.00%
Investment, Identifier [Axis]: Syntax Systems Ltd, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[27] 620  
Fair value at ending balance [2],[3],[4],[11],[27]   $ 620
Interest [2],[3],[4],[11],[27]   5.50%
Interest [2],[3],[4],[11],[27]   11.00%
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 [4],[18] 73  
Fair value at ending balance $ 83 [15],[17] $ 73 [4],[18]
Investment owned, balance (in shares) 1,589 [5],[7],[8],[15],[17] 1,589 [4],[10],[12],[13],[18]
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 [4] $ 2,395  
Fair value at ending balance $ 2,785 [15] $ 2,395 [4]
Investment, interest rate, paid in kind 7.80% [15] 7.80% [4]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 810  
Fair value at ending balance $ 2,036 [6],[15],[23],[24] $ 810 [1],[2],[4],[11]
Interest 4.75% [6],[15],[23],[24] 4.75% [1],[2],[4],[11]
Interest 9.80% [6],[15],[23],[24] 10.10% [1],[2],[4],[11]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 590  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 10.10%  
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, First Lien Senior Secured Term Loan1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 584  
Fair value at ending balance [1],[2],[4]   $ 584
Interest [1],[2],[4]   5.00%
Interest [1],[2],[4]   10.40%
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] 9  
Fair value at ending balance [4],[18]   $ 9
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   4,673
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[17] $ 13  
Investment owned, balance (in shares) [5],[7],[8],[15],[17] 4,673  
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (10)  
Fair value at ending balance $ (7) [6],[15],[23],[24] $ (10) [1],[2],[4],[11]
Interest 4.75% [6],[15],[23],[24] 4.75% [1],[2],[4],[11]
Interest 9.80% [6],[15],[23],[24] 10.10% [1],[2],[4],[11]
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 beginning balance [2],[4],[27] $ 7,915  
Fair value at ending balance $ 7,792 [15],[24],[33] $ 7,915 [2],[4],[27]
Interest 5.75% [15],[24],[33] 5.75% [2],[4],[27]
Interest 10.20% [15],[24],[33] 11.20% [2],[4],[27]
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 beginning balance [2],[4],[11],[27] $ 2,430  
Fair value at ending balance $ 2,493 [6],[15],[24],[32] $ 2,430 [2],[4],[11],[27]
Interest 6.00% [6],[15],[24],[32] 6.00% [2],[4],[11],[27]
Interest 10.90% [6],[15],[24],[32] 11.50% [2],[4],[11],[27]
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 [2],[4],[11],[27] $ 223  
Fair value at ending balance $ 604 [6],[15],[24],[32] $ 223 [2],[4],[11],[27]
Interest 5.75% [6],[15],[24],[32] 5.75% [2],[4],[11],[27]
Interest 10.60% [6],[15],[24],[32] 11.20% [2],[4],[11],[27]
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 [6],[9],[15],[24],[37] $ 1,820  
Interest [6],[9],[15],[24],[37] 5.50%  
Interest [6],[9],[15],[24],[37] 10.70%  
Investment, Identifier [Axis]: Tanqueray Bidco Limited, Technology, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[37] $ 0  
Interest [9],[15],[24],[37] 5.50%  
Interest [9],[15],[24],[37] 10.70%  
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 [2],[3],[4],[11],[36] $ 1,730  
Fair value at ending balance [2],[3],[4],[11],[36]   $ 1,730
Interest [2],[3],[4],[11],[36]   5.50%
Interest [2],[3],[4],[11],[36]   10.70%
Investment, Identifier [Axis]: Team Air Distributing, LLC, Consumer Cyclical, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 78  
Investment owned, balance (in shares) [5],[7],[8],[15] 79,475.57  
Investment, Identifier [Axis]: Team Air Distributing, 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 [15] $ 702  
Interest [15] 12.00%  
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 beginning balance [4],[18] $ 420  
Fair value at ending balance [4],[18]   $ 420
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   400,000
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 [15],[17] $ 392  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 beginning balance [4] $ 590  
Fair value at ending balance [4]   $ 590
Interest [4]   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],[2],[4],[16] 10,382  
Fair value at ending balance [1],[2],[4],[16]   $ 10,382
Interest [1],[2],[4],[16]   7.50%
Interest [1],[2],[4],[16]   13.10%
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 [2],[16],[25] 9,646  
Fair value at ending balance [2],[16],[25]   $ 9,646
Interest [2],[16],[25]   5.00%
Interest [2],[16],[25]   10.90%
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 [2],[4],[16],[25] 4,694  
Fair value at ending balance [2],[4],[16],[25]   $ 4,694
Interest [2],[4],[16],[25]   9.00%
Interest [2],[4],[16],[25]   14.90%
Investment, Identifier [Axis]: Technology Service Stream BidCo Pty Ltd, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[31] $ 756  
Interest [6],[9],[15],[24],[31] 5.50%  
Interest [6],[9],[15],[24],[31] 10.00%  
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 [2],[3],[4],[28] $ 3,814  
Fair value at ending balance $ 3,875 [9],[15],[24],[29] $ 3,814 [2],[3],[4],[28]
Interest 5.40% [9],[15],[24],[29] 5.50% [2],[3],[4],[28]
Interest 8.70% [9],[15],[24],[29] 9.30% [2],[3],[4],[28]
Investment, Identifier [Axis]: Techone B.V., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[28] $ 201  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 201
Interest [2],[3],[4],[11],[28]   5.50%
Interest [2],[3],[4],[11],[28]   9.30%
Investment, Identifier [Axis]: Techone B.V., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ (6)  
Interest [6],[9],[15],[24],[29] 5.40%  
Interest [6],[9],[15],[24],[29] 8.70%  
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 beginning balance [1],[2],[4] $ 6,226  
Fair value at ending balance $ 8,340 [15],[23],[24] $ 6,226 [1],[2],[4]
Interest 5.00% [15],[23],[24] 5.00% [1],[2],[4]
Interest 10.20% [15],[23],[24] 10.60% [1],[2],[4]
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (6)  
Fair value at ending balance [1],[2],[4],[11]   $ (6)
Interest [1],[2],[4],[11]   5.00%
Interest [1],[2],[4],[11]   10.60%
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Capital Equipment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (26)  
Interest [6],[15],[23],[24] 5.00%  
Interest [6],[15],[23],[24] 10.20%  
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 [4],[18] $ 115  
Fair value at ending balance $ 137 [15],[17] $ 115 [4],[18]
Investment owned, balance (in shares) 24,358.97 [5],[7],[8],[15],[17] 24,358.97 [4],[10],[12],[13],[18]
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 [4] $ 260  
Fair value at ending balance $ 266 [15] $ 260 [4]
Interest 10.00% [15] 10.00% [4]
Investment, interest rate, paid in kind 4.00% [15] 4.00% [4]
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 830  
Fair value at ending balance $ 1,825 [15],[23],[24] $ 830 [1],[2],[4],[11]
Interest 4.25% [15],[23],[24] 4.25% [1],[2],[4],[11]
Interest 8.90% [15],[23],[24] 9.60% [1],[2],[4],[11]
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 824  
Interest [15],[23],[24] 4.25%  
Interest [15],[23],[24] 9.20%  
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Brokerage, Asset Managers & Exchanges, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 0  
Fair value at ending balance [1],[2],[4],[11]   $ 0
Interest [1],[2],[4],[11]   4.25%
Interest [1],[2],[4],[11]   9.60%
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 ending balance [6],[15],[23],[24] $ 0  
Interest [6],[15],[23],[24] 4.25%  
Interest [6],[15],[23],[24] 9.20%  
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 [2],[4],[25] $ 3,578  
Fair value at ending balance [2],[4],[25]   $ 3,578
Interest [2],[4],[25]   7.75%
Interest [2],[4],[25]   13.20%
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 ending balance [15],[24],[33] $ 3,704  
Interest [15],[24],[33] 7.75%  
Interest [15],[24],[33] 6.00%  
Investment, interest rate, paid in kind [15],[24],[33] 7.00%  
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 beginning balance [2],[4],[27] $ 12,680  
Fair value at ending balance [2],[4],[27]   $ 12,680
Interest [2],[4],[27]   5.75%
Interest [2],[4],[27]   11.10%
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] 0  
Fair value at ending balance [2],[4],[11],[27]   $ 0
Interest [2],[4],[11],[27]   5.75%
Interest [2],[4],[11],[27]   11.10%
Investment, Identifier [Axis]: The Cleaver-Brooks Company, Inc., Capital Equipment, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4] 4,882  
Fair value at ending balance [4]   $ 4,882
Investment, interest rate, paid in kind [4]   12.50%
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 beginning balance [2],[4],[11],[27] 11,317  
Fair value at ending balance $ 11,390 [15],[24],[32] $ 11,317 [2],[4],[11],[27]
Interest 5.75% [15],[24],[32] 5.75% [2],[4],[11],[27]
Interest 10.70% [15],[24],[32] 11.20% [2],[4],[11],[27]
Investment, Identifier [Axis]: The Octave Music Group, Inc., 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 [23],[24] $ 3,595  
Interest [23],[24] 4.75%  
Interest [23],[24] 9.30%  
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 [4],[18] $ 2,152  
Fair value at ending balance [4],[18]   $ 2,152
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   676,880.98
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 ending balance [15] $ 2,342  
Investment owned, balance (in shares) [5],[7],[8],[15] 676,880.98  
Investment, Identifier [Axis]: The Octave Music Group, Inc., Media: Diversified & Production, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,240  
Fair value at ending balance [1],[2],[4]   $ 4,240
Interest [1],[2],[4]   7.50%
Interest [1],[2],[4]   12.80%
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 beginning balance [18] 13,365  
Fair value at ending balance 8,587 [15],[17] $ 13,365 [18]
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 13,365 30,339
Gross Additions [20] 0 0
Gross Reductions [21] (4,713) (17,733)
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (65) 759
Fair value at ending balance 8,587 13,365
Amount of Interest or Dividends Credited to Income [22] 0 0
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 [2],[27] 5,433  
Fair value at ending balance [2],[27]   $ 5,433
Interest [2],[27]   6.00%
Interest [2],[27]   11.50%
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 [2],[4],[27] 3,717  
Fair value at ending balance [2],[4],[27]   $ 3,717
Interest [2],[4],[27]   6.00%
Interest [2],[4],[27]   11.50%
Investment, interest rate, paid in kind [2],[4],[27]   5.00%
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 [2],[3],[4],[67] 4,617  
Fair value at ending balance $ 4,499 [9],[15],[24],[68] $ 4,617 [2],[3],[4],[67]
Interest 5.00% [9],[15],[24],[68] 6.75% [2],[3],[4],[67]
Interest 10.50% [9],[15],[24],[68] 12.20% [2],[3],[4],[67]
Investment, Identifier [Axis]: Trader Corporation, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[67] $ (6)  
Fair value at ending balance [2],[3],[4],[11],[67]   $ (6)
Interest [2],[3],[4],[11],[67]   6.75%
Interest [2],[3],[4],[11],[67]   12.20%
Investment, Identifier [Axis]: Trader Corporation, Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[68] $ (4)  
Interest [6],[9],[15],[24],[68] 5.00%  
Interest [6],[9],[15],[24],[68] 10.50%  
Investment, Identifier [Axis]: Transit Technologies LLC, Software, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 6,035  
Fair value at ending balance [1],[2],[4]   $ 6,035
Interest [1],[2],[4]   4.75%
Interest [1],[2],[4]   10.30%
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 [2],[4],[25] 10,335  
Fair value at ending balance $ 8,677 [15],[23],[24] $ 10,335 [2],[4],[25]
Interest 4.50% [15],[23],[24] 4.50% [2],[4],[25]
Interest 9.20% [15],[23],[24] 10.00% [2],[4],[25]
Investment, interest rate, paid in kind [15],[23],[24] 2.50%  
Investment, Identifier [Axis]: Trident Maritime Systems, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 15,409  
Fair value at ending balance $ 14,953 [15],[23],[24] $ 15,409 [1],[2],[4]
Interest 5.50% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.30% [15],[23],[24] 10.90% [1],[2],[4]
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 beginning balance [2],[4],[27] $ 6,790  
Fair value at ending balance $ 6,786 [15],[24],[32] $ 6,790 [2],[4],[27]
Interest 5.50% [15],[24],[32] 6.50% [2],[4],[27]
Interest 10.30% [15],[24],[32] 11.90% [2],[4],[27]
Investment, Identifier [Axis]: Trintech, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ 140  
Fair value at ending balance [2],[4],[11],[27]   $ 140
Interest [2],[4],[11],[27]   6.50%
Interest [2],[4],[11],[27]   11.90%
Investment, Identifier [Axis]: Trintech, Inc., Technology, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 143  
Interest [6],[15],[24],[32] 5.50%  
Interest [6],[15],[24],[32] 10.30%  
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Automotive Parts & Equipment, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 18,967  
Fair value at ending balance [1],[2],[4]   $ 18,967
Interest [1],[2],[4]   6.25%
Interest [1],[2],[4]   11.70%
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 [4],[16],[18] 0  
Fair value at ending balance [4],[16],[18]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[16],[18]   2.71
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [14],[15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 2.71  
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 [4],[16],[18] $ 0  
Fair value at ending balance [4],[16],[18]   $ 0
Investment owned, balance (in shares) [4],[10],[12],[13],[16],[18]   2.8
Investment, Identifier [Axis]: True Religion Apparel, Inc., Retail, Preferred Unit    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [14],[15],[17] $ 0  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 2.8  
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 [4] $ 1,323  
Fair value at ending balance [4]   $ 1,323
Investment owned, balance (in shares) [4],[10],[12],[13]   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 beginning balance [1],[2],[4] 6,739  
Fair value at ending balance [1],[2],[4]   $ 6,739
Interest [1],[2],[4]   5.25%
Interest [1],[2],[4]   10.60%
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],[2],[4],[11] 7,939  
Fair value at ending balance $ 7,857 [15],[23],[24] $ 7,939 [1],[2],[4],[11]
Interest 6.00% [15],[23],[24] 6.00% [1],[2],[4],[11]
Interest 10.70% [15],[23],[24] 11.50% [1],[2],[4],[11]
Investment, Identifier [Axis]: Turnberry Solutions, Inc., Consumer Cyclical, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,898  
Fair value at ending balance $ 4,887 [15],[24],[32] $ 4,898 [1],[2],[4]
Interest 5.75% [15],[24],[32] 6.00% [1],[2],[4]
Interest 10.70% [15],[24],[32] 11.40% [1],[2],[4]
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Financial Other, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[44] $ 1,529  
Fair value at ending balance $ 1,539 [6],[9],[15],[24],[45] $ 1,529 [2],[3],[4],[11],[44]
Interest 5.25% [6],[9],[15],[24],[45] 5.25% [2],[3],[4],[11],[44]
Interest 8.50% [6],[9],[15],[24],[45] 9.30% [2],[3],[4],[11],[44]
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Financial Other, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 564  
Interest [9],[15],[24],[29] 5.25%  
Interest [9],[15],[24],[29] 8.40%  
Investment, Identifier [Axis]: UBC Ledgers Holding AB, Financial Other, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[11],[44] $ 0  
Fair value at ending balance [2],[3],[4],[11],[44]   $ 0
Interest [2],[3],[4],[11],[44]   5.25%
Interest [2],[3],[4],[11],[44]   9.30%
Investment, Identifier [Axis]: UKFast Leaders Limited, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[3],[4],[36] 10,762  
Fair value at ending balance $ 11,737 [9],[15],[24],[37] $ 10,762 [2],[3],[4],[36]
Interest 7.25% [9],[15],[24],[37] 4.50% [2],[3],[4],[36]
Interest 12.30% [9],[15],[24],[37] 4.50% [2],[3],[4],[36]
Investment, interest rate, paid in kind [2],[3],[4],[36]   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 beginning balance [2],[4],[11],[27] $ 9,883  
Fair value at ending balance $ 1,324 [6],[15],[23],[24] $ 9,883 [2],[4],[11],[27]
Interest 5.75% [6],[15],[23],[24] 5.75% [2],[4],[11],[27]
Interest 10.50% [6],[15],[23],[24] 11.10% [2],[4],[11],[27]
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 ending balance [15],[23],[24] $ 8,655  
Interest [15],[23],[24] 5.75%  
Interest [15],[23],[24] 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 [2],[3],[4],[11],[36] $ 877  
Fair value at ending balance $ 995 [6],[9],[15],[24],[52] $ 877 [2],[3],[4],[11],[36]
Interest 4.84% [6],[9],[15],[24],[52] 6.00% [2],[3],[4],[11],[36]
Interest 9.80% [6],[9],[15],[24],[52] 11.40% [2],[3],[4],[11],[36]
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 [2],[3],[4],[11],[38] $ 1,312  
Fair value at ending balance $ 1,398 [6],[9],[15],[24],[29] $ 1,312 [2],[3],[4],[11],[38]
Interest 6.75% [6],[9],[15],[24],[29] 5.75% [2],[3],[4],[11],[38]
Interest 10.00% [6],[9],[15],[24],[29] 9.90% [2],[3],[4],[11],[38]
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 beginning balance [2],[3],[4],[11],[28] $ 2,037  
Fair value at ending balance [2],[3],[4],[11],[28]   $ 2,037
Interest [2],[3],[4],[11],[28]   6.25%
Interest [2],[3],[4],[11],[28]   10.20%
Investment, Identifier [Axis]: Unither (Uniholding), Pharmaceuticals, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[9],[15],[24],[29] $ 2,078  
Interest [6],[9],[15],[24],[29] 5.18%  
Interest [6],[9],[15],[24],[29] 8.50%  
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 1,607  
Interest [9],[15],[24],[29] 4.75%  
Interest [9],[15],[24],[29] 8.10%  
Investment, interest rate, paid in kind [9],[15],[24],[29] 1.80%  
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 [2],[3],[4],[28] $ 1,559  
Fair value at ending balance $ 931 [9],[15],[23],[24] $ 1,559 [2],[3],[4],[28]
Interest 5.25% [9],[15],[23],[24] 6.65% [2],[3],[4],[28]
Interest 8.30% [9],[15],[23],[24] 10.10% [2],[3],[4],[28]
Investment, interest rate, paid in kind 1.80% [9],[15],[23],[24] 1.80% [2],[3],[4],[28]
Investment, Identifier [Axis]: Utac Ceram, Business Services, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4] $ 3,353  
Fair value at ending balance $ 2,445 [9],[15],[23],[24] $ 3,353 [1],[2],[3],[4]
Interest 6.75% [9],[15],[23],[24] 6.65% [1],[2],[3],[4]
Interest 9.90% [9],[15],[23],[24] 12.00% [1],[2],[3],[4]
Investment, interest rate, paid in kind 1.80% [9],[15],[23],[24] 1.80% [1],[2],[3],[4]
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 [3],[16],[18] $ 91  
Fair value at ending balance 14 [9],[14],[17] $ 91 [3],[16],[18]
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 [3],[16],[18] 943  
Fair value at ending balance [3],[16],[18]   943
Investment, Identifier [Axis]: VOYA CLO 2016-2, LTD., Multi-Sector Holdings, Subordinated Structured Notes 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[14],[17] 1,261  
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 [2],[4],[27] 4,783  
Fair value at ending balance $ 4,783 [15],[24],[32] $ 4,783 [2],[4],[27]
Interest 5.25% [15],[24],[32] 5.25% [2],[4],[27]
Interest 10.20% [15],[24],[32] 10.70% [2],[4],[27]
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 [4],[16],[18] $ 2  
Fair value at ending balance [4],[16],[18]   $ 2
Investment owned, balance (in shares) [4],[10],[12],[13],[16],[18]   4,676
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [14],[15],[17] $ 3  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 5,591  
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 [4],[16],[18] $ 3  
Fair value at ending balance [4],[16],[18]   $ 3
Investment owned, balance (in shares) [4],[10],[12],[13],[16],[18]   5,591
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Automotive, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [14],[15],[17] $ 2  
Investment owned, balance (in shares) [5],[7],[8],[14],[15],[17] 4,676  
Investment, Identifier [Axis]: Victoria Bidco Limited, Industrial Machinery, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[37] $ 3,784  
Interest [9],[15],[24],[37] 6.50%  
Interest [9],[15],[24],[37] 11.70%  
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 [2],[3],[4],[36] $ 3,573  
Fair value at ending balance [2],[3],[4],[36]   $ 3,573
Interest [2],[3],[4],[36]   6.50%
Interest [2],[3],[4],[36]   11.40%
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],[2],[16] 5,908  
Fair value at ending balance $ 6,053 [14],[23],[24] $ 5,908 [1],[2],[16]
Interest 7.25% [14],[23],[24] 7.25% [1],[2],[16]
Interest 12.80% [14],[23],[24] 12.90% [1],[2],[16]
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 [4] $ 3,262  
Fair value at ending balance $ 3,154 [15] $ 3,262 [4]
Interest 6.30% [15] 6.30% [4]
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 7,526  
Fair value at ending balance $ 7,369 [15],[23],[24] $ 7,526 [1],[2],[4]
Interest 5.50% [15],[23],[24] 5.50% [1],[2],[4]
Interest 10.50% [15],[23],[24] 10.90% [1],[2],[4]
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 [4],[18] $ 434  
Fair value at ending balance [4],[18]   $ 434
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   16,442.9
Investment, Identifier [Axis]: Vital Buyer, LLC, Technology, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 296  
Investment owned, balance (in shares) [5],[7],[8],[15] 16,442.9  
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 beginning balance [1],[4] $ 5,785  
Fair value at ending balance $ 5,798 [15],[23] $ 5,785 [1],[4]
Interest 4.75% [15],[23] 5.25% [1],[4]
Interest 9.40% [15],[23] 10.60% [1],[4]
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 ending balance [15],[23],[24] $ 2,720  
Interest [15],[23],[24] 5.25%  
Interest [15],[23],[24] 10.30%  
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 [6],[15],[23],[24] $ 52  
Interest [6],[15],[23],[24] 6.25%  
Interest [6],[15],[23],[24] 11.00%  
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC, Insurance, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 2,475  
Interest [15],[23],[24] 6.25%  
Interest [15],[23],[24] 11.00%  
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 beginning balance [1],[2],[4],[11] $ 2,403  
Fair value at ending balance [1],[2],[4],[11]   $ 2,403
Interest [1],[2],[4],[11]   6.25%
Interest [1],[2],[4],[11]   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],[2],[4] 12,346  
Fair value at ending balance $ 2,158 [15],[23],[24] $ 12,346 [1],[2],[4]
Interest 5.75% [15],[23],[24] 5.75% [1],[2],[4]
Interest 10.40% [15],[23],[24] 11.10% [1],[2],[4]
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 9,922  
Interest [15],[23],[24] 5.75%  
Interest [15],[23],[24] 10.40%  
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 466  
Fair value at ending balance [1],[2],[4],[11]   $ 466
Interest [1],[2],[4],[11]   5.75%
Interest [1],[2],[4],[11]   11.10%
Investment, Identifier [Axis]: WWEC Holdings III Corp, Capital Goods, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ (35)  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 10.40%  
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 beginning balance [3],[18] $ 15,470  
Fair value at ending balance 12,918 [9],[15] $ 15,470 [3],[18]
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 15,470 20,212
Gross Additions [20] 0 2,480
Gross Reductions [21] (331) 0
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (2,221) (7,222)
Fair value at ending balance 12,918 15,470
Amount of Interest or Dividends Credited to Income [22] 3,091 1,460
Investment, Identifier [Axis]: Watermill-QMC Midco, Inc., Automotive, Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[16],[18] 0  
Fair value at ending balance [4],[16],[18]   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 ending balance [14],[15],[17] 0  
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 [4] 9,884  
Fair value at ending balance $ 7,847 [15] $ 9,884 [4]
Interest 12.00% [15] 12.00% [4]
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 beginning balance [1],[2],[4] $ 8,345  
Fair value at ending balance $ 735 [15],[23],[24] $ 8,345 [1],[2],[4]
Interest 5.50% [15],[23],[24] 7.00% [1],[2],[4]
Interest 10.10% [15],[23],[24] 12.30% [1],[2],[4]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 845  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.10%  
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 8,547  
Interest [15],[23],[24] 6.50%  
Interest [15],[23],[24] 11.20%  
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Aerospace & Defense, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[18] $ 804  
Fair value at ending balance [4],[18]   $ 804
Investment owned, balance (in shares) [4],[10],[12],[13],[18]   63,087.1
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 [15],[17] $ 852  
Investment owned, balance (in shares) [5],[7],[8],[15],[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 beginning balance [1],[2],[4],[11] $ 67  
Fair value at ending balance $ 968 [6],[15],[24],[32] $ 67 [1],[2],[4],[11]
Interest 6.50% [6],[15],[24],[32] 7.00% [1],[2],[4],[11]
Interest 11.20% [6],[15],[24],[32] 12.30% [1],[2],[4],[11]
Investment, Identifier [Axis]: White Bidco Limited, Technology, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[3],[4],[11] $ 1,687  
Fair value at ending balance $ 1,742 [6],[9],[15],[23],[24] $ 1,687 [1],[2],[3],[4],[11]
Interest 6.00% [6],[9],[15],[23],[24] 6.00% [1],[2],[3],[4],[11]
Interest 11.30% [6],[9],[15],[23],[24] 11.40% [1],[2],[3],[4],[11]
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],[2],[16] $ 47  
Fair value at ending balance $ 46 [14],[23],[24] $ 47 [1],[2],[16]
Interest 4.75% [14],[23],[24] 6.25% [1],[2],[16]
Interest 10.00% [14],[23],[24] 11.80% [1],[2],[16]
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 [4],[18] $ 1,012  
Fair value at ending balance $ 1,035 [15],[17] $ 1,012 [4],[18]
Investment owned, balance (in shares) 1,663.3 [5],[7],[8],[15],[17] 1,663.3 [4],[10],[12],[13],[18]
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 4,946  
Fair value at ending balance $ 6,113 [15],[23],[24] $ 4,946 [1],[2],[4]
Interest 5.50% [15],[23],[24] 5.75% [1],[2],[4]
Interest 10.70% [15],[23],[24] 11.40% [1],[2],[4]
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 401  
Investment owned, balance (in shares) [5],[7],[8],[15] 364  
Investment, interest rate, paid in kind [15] 20.00%  
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 1,378  
Fair value at ending balance [1],[2],[4],[11]   $ 1,378
Interest [1],[2],[4],[11]   5.75%
Interest [1],[2],[4],[11]   11.40%
Investment, Identifier [Axis]: Woodland Foods, LLC, Food & Beverage, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 1,155  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.70%  
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15],[23],[24] $ 18,625  
Interest [15],[23],[24] 5.75%  
Interest [15],[23],[24] 10.60%  
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] $ 2,414  
Fair value at ending balance [1],[2],[4]   $ 2,414
Interest [1],[2],[4]   4.50%
Interest [1],[2],[4]   10.10%
Investment, Identifier [Axis]: World 50, Inc., Professional Services, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4] 8,760  
Fair value at ending balance [1],[2],[4]   $ 8,760
Interest [1],[2],[4]   4.50%
Interest [1],[2],[4]   10.10%
Investment, Identifier [Axis]: World 50, Inc., Professional Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 130  
Interest [6],[15],[23],[24] 5.75%  
Interest [6],[15],[23],[24] 10.60%  
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 [3],[4],[18] $ 582  
Fair value at ending balance [3],[4],[18]   $ 582
Investment owned, balance (in shares) [3],[4],[10],[12],[13],[18]   45,665,825
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[17] $ 613  
Investment owned, balance (in shares) [5],[7],[8],[9],[15],[17] 45,665,825  
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 [2],[3],[4],[11],[36] $ 6,448  
Fair value at ending balance $ 9,180 [6],[9],[15],[24],[37] $ 6,448 [2],[3],[4],[11],[36]
Interest 5.25% [6],[9],[15],[24],[37] 5.25% [2],[3],[4],[11],[36]
Interest 10.20% [6],[9],[15],[24],[37] 10.40% [2],[3],[4],[11],[36]
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Financial Other, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[29] $ 304  
Interest [9],[15],[24],[29] 5.25%  
Interest [9],[15],[24],[29] 8.90%  
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 [3],[4] $ 3,241  
Fair value at ending balance $ 3,923 [9],[15] $ 3,241 [3],[4]
Investment, interest rate, paid in kind 11.00% [9],[15] 11.00% [3],[4]
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ 6,271  
Fair value at ending balance $ 9,060 [15],[23],[24] $ 6,271 [1],[2],[4],[11]
Interest 5.50% [15],[23],[24] 6.00% [1],[2],[4],[11]
Interest 10.30% [15],[23],[24] 11.50% [1],[2],[4],[11]
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 [4] $ 172  
Fair value at ending balance [4]   $ 172
Investment owned, balance (in shares) [4],[10],[12],[13]   152.69
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [15] $ 188  
Investment owned, balance (in shares) [5],[7],[8],[15] 152.69  
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1],[2],[4],[11] $ (6)  
Fair value at ending balance [1],[2],[4],[11]   $ (6)
Interest [1],[2],[4],[11]   6.00%
Interest [1],[2],[4],[11]   11.50%
Investment, Identifier [Axis]: ZB Holdco LLC, Food & Beverage, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[23],[24] $ 459  
Interest [6],[15],[23],[24] 5.50%  
Interest [6],[15],[23],[24] 10.30%  
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 [2],[3],[4],[11],[36] $ 5,718  
Fair value at ending balance $ 4,654 [9],[15],[24],[37] $ 5,718 [2],[3],[4],[11],[36]
Interest 6.00% [9],[15],[24],[37] 6.00% [2],[3],[4],[11],[36]
Interest 11.00% [9],[15],[24],[37] 11.40% [2],[3],[4],[11],[36]
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Services: Business, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [9],[15],[24],[37] $ 591  
Interest [9],[15],[24],[37] 6.25%  
Interest [9],[15],[24],[37] 11.20%  
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 [2],[4],[27] $ 3,473  
Fair value at ending balance $ 3,467 [15],[24],[32] $ 3,473 [2],[4],[27]
Interest 5.00% [15],[24],[32] 5.00% [2],[4],[27]
Interest 10.00% [15],[24],[32] 10.50% [2],[4],[27]
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [2],[4],[11],[27] $ 0  
Fair value at ending balance [2],[4],[11],[27]   $ 0
Interest [2],[4],[11],[27]   5.00%
Interest [2],[4],[11],[27]   10.50%
Investment, Identifier [Axis]: eShipping, LLC, Transportation Services, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [6],[15],[24],[32] $ 0  
Interest [6],[15],[24],[32] 5.00%  
Interest [6],[15],[24],[32] 10.00%  
Celebration Bidco, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 18,391  
Fair value at ending balance 18,906 $ 18,391
Coastal Marina Holdings, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 34,677  
Fair value at ending balance 38,863 34,677
Eclipse Business Capital, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 155,889  
Fair value at ending balance 148,217 155,889
Hylan Datacom And Electrical, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 10,449  
Fair value at ending balance   10,449
Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 41,053  
Fair value at ending balance 40,871 41,053
Rocade Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 73,957  
Fair value at ending balance 80,580 73,957
Sierra Senior Loan Strategy JV I, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 39,172  
Fair value at ending balance 41,297 39,172
Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 13,365  
Fair value at ending balance 8,587 13,365
Waccamaw River, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 15,470  
Fair value at ending balance 12,918 15,470
Black Angus Steakhouses, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 12,035  
Fair value at ending balance 9,473 12,035
MVC Automotive Group GmbH    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 25,192  
Fair value at ending balance 16,796 25,192
MVC Private Equity Fund LP    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 1,005  
Fair value at ending balance 570 1,005
Security Holdings B.V.    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 52,688  
Fair value at ending balance 62,436 52,688
Affiliate investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 402,423 289,993
Gross Additions [20] 31,822 165,576
Gross Reductions [21] (34,136) (60,342)
Amount of Realized Gain (Loss) (4,179) (64)
Amount of Unrealized Gain (Loss) (5,691) 7,260
Fair value at ending balance 390,239 402,423
Amount of Interest or Dividends Credited to Income [22] 29,851 36,382
Affiliate investments | 1888 Industrial Services, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 0 1,263
Gross Additions [19],[20]   55
Gross Reductions [19],[21]   (1,197)
Amount of Realized Gain (Loss) [19]   (775)
Amount of Unrealized Gain (Loss) [19]   654
Fair value at ending balance [19]   0
Amount of Interest or Dividends Credited to Income [19],[22]   194
Affiliate investments | Celebration Bidco, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 18,391 0
Gross Additions [19],[20] 0 18,391
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] 515 0
Fair value at ending balance [19] 18,906 18,391
Amount of Interest or Dividends Credited to Income [19],[22] 637 0
Affiliate investments | Coastal Marina Holdings, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 34,677 0
Gross Additions [19],[20] 4,362 35,243
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] (176) (566)
Fair value at ending balance [19] 38,863 34,677
Amount of Interest or Dividends Credited to Income [19],[22] 1,655 1,086
Affiliate investments | Eclipse Business Capital, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 155,889 144,884
Gross Additions [19],[20] 20,747 35,561
Gross Reductions [19],[21] (19,455) (35,530)
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] (8,964) 10,974
Fair value at ending balance [19] 148,217 155,889
Amount of Interest or Dividends Credited to Income [19],[22] 11,756 15,253
Affiliate investments | Hylan Datacom And Electrical, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 10,449 12,511
Gross Additions [19],[20] 333 496
Gross Reductions [19],[21] (9,637) 0
Amount of Realized Gain (Loss) [19] (4,179) 0
Amount of Unrealized Gain (Loss) [19] 3,034 (2,558)
Fair value at ending balance [19] 0 10,449
Amount of Interest or Dividends Credited to Income [19],[22] 492 1,257
Affiliate investments | Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 41,053 40,088
Gross Additions [20] 0 0 [19]
Gross Reductions [21] 0 0 [19]
Amount of Realized Gain (Loss) 0 0 [19]
Amount of Unrealized Gain (Loss) (182) 965 [19]
Fair value at ending balance 40,871 41,053 [19]
Amount of Interest or Dividends Credited to Income [22] 4,282 5,709 [19]
Affiliate investments | Kemmerer Operations LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 0 2,746
Gross Additions [19],[20]   237
Gross Reductions [19],[21]   (4,102)
Amount of Realized Gain (Loss) [19]   711
Amount of Unrealized Gain (Loss) [19]   408
Fair value at ending balance [19]   0
Amount of Interest or Dividends Credited to Income [19],[22]   156
Affiliate investments | Rocade Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [19] 73,957 0
Gross Additions [19],[20] 6,380 73,113
Gross Reductions [19],[21] 0 0
Amount of Realized Gain (Loss) [19] 0 0
Amount of Unrealized Gain (Loss) [19] 243 844
Fair value at ending balance [19] 80,580 73,957
Amount of Interest or Dividends Credited to Income [19],[22] 6,380 5,612
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 39,172 37,950
Gross Additions [20] 0 0
Gross Reductions [21] 0 (1,780)
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) 2,125 3,002
Fair value at ending balance 41,297 39,172
Amount of Interest or Dividends Credited to Income [22] 1,558 5,655
Affiliate investments | Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 13,365 30,339
Gross Additions [20] 0 0
Gross Reductions [21] (4,713) (17,733)
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (65) 759
Fair value at ending balance 8,587 13,365
Amount of Interest or Dividends Credited to Income [22] 0 0
Affiliate investments | Waccamaw River, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 15,470 20,212
Gross Additions [20] 0 2,480
Gross Reductions [21] (331) 0
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (2,221) (7,222)
Fair value at ending balance 12,918 15,470
Amount of Interest or Dividends Credited to Income [22] 3,091 1,460
Control investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 90,920 106,328
Gross Additions [48] 1,617 8,578
Gross Reductions [49] 0 (986)
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (3,262) (23,000)
Fair value at ending balance 89,275 90,920
Amount of Interest or Dividends Credited to Income [50] 2,208 3,313
Control investments | Black Angus Steakhouses, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [47] 12,035 14,794
Gross Additions [47],[48] 926 1,330
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] (3,488) (4,089)
Fair value at ending balance [47] 9,473 12,035
Amount of Interest or Dividends Credited to Income [47],[50] 837 1,401
Control investments | MVC Automotive Group GmbH    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [47] 25,192 16,824
Gross Additions [47],[48] 0 2,613
Gross Reductions [47],[49] 0 0
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] (8,396) 5,755
Fair value at ending balance [47] 16,796 25,192
Amount of Interest or Dividends Credited to Income [47],[50] 444 587
Control investments | MVC Private Equity Fund LP    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 1,005 1,838
Gross Additions [48] 0 0
Gross Reductions [49] 0 (964)
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (435) 131
Fair value at ending balance 570 1,005
Amount of Interest or Dividends Credited to Income [50] 44 95
Control investments | Security Holdings B.V.    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [47] 52,688 72,872
Gross Additions [47],[48] 691 4,635
Gross Reductions [47],[49] 0 (22)
Amount of Realized Gain (Loss) [47] 0 0
Amount of Unrealized Gain (Loss) [47] 9,057 (24,797)
Fair value at ending balance [47] 62,436 52,688
Amount of Interest or Dividends Credited to Income [47],[50] $ 883 $ 1,230
[1] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2023 was 5.33140%.
[2] Debt investment includes interest rate floor feature.
[3] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 28.8% of total investments at fair value as of December 31, 2023. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets. If at any time qualifying assets do not represent at least 70% of the Company’s total assets, the Company will be precluded from acquiring any additional non-qualifying asset until such time as it complies with the requirements of Section 55(a).
[4] The fair value of the investment was determined using significant unobservable inputs.
[5] A summary of the composition of the Company’s investment portfolio at cost and fair value, and as a percentage of total investments and net assets are as follows:
($ in thousands)CostPercent of
Total
Portfolio
Fair ValuePercent of
Total
Portfolio
Percent of
Total
Net Assets
September 30, 2024:
Senior debt and 1st lien notes
$1,659,800 68 %$1,632,057 68 %137 %
Subordinated debt and 2nd lien notes
214,860 199,971 17 
Structured products99,154 91,493 
Equity shares328,635 13 382,531 16 32 
Equity warrants76 — 2,600 — — 
Royalty rights3,790 — 3,819 — — 
Investments in joint ventures / PE fund140,605 104,243 
$2,446,920 100 %$2,416,714 100 %202 %
[6] Position or portion thereof is an unfunded loan or equity commitment.
[7] 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 Overnight Repo Rate Average (“CORRA”), 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.
[8] All of the Company’s portfolio company investments (including joint venture investments), which as of September 30, 2024 represented 202.3% 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.
[9] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 28.8% of total investments at fair value as of September 30, 2024. 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).
[10] A summary of the composition of the Company’s investment portfolio at cost and fair value, and as a percentage of total investments and net assets are as follows:
($ in thousands)CostPercent of
Total
Portfolio
Fair ValuePercent of
Total
Portfolio
Percent of
Total
Net Assets
December 31, 2023:
Senior debt and 1st lien notes
$1,705,353 67 %$1,670,300 67 %140 %
Subordinated debt and 2nd lien notes
256,850 10 238,215 10 20 
Structured products107,314 93,038 
Equity shares320,335 13 374,704 15 31 
Equity warrants76 — 2,392 — — 
Investments in joint ventures / PE fund145,648 110,066 
$2,535,576 100 %$2,488,715 100 %208 %
[11] Position or portion thereof is an unfunded loan or equity commitment.
[12] 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 SOFR, EURIBOR, BBSY, STIBOR, Canadian Dollar Offer Rate (“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.
[13] All of the Company’s portfolio company investments (including joint venture investments), which as of December 31, 2023 represented 208.0% of the Company’s net assets, are subject to legal restrictions on sales. The acquisition date represents the date of the Company’s initial investment in the relevant portfolio company.
[14] Investment was purchased as part of the Sierra Merger and is part of the Sierra Reference Portfolio for purposes of the Sierra Credit Support Agreement.
[15] The fair value of the investment was determined using significant unobservable inputs.
[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] Investment is non-income producing.
[19]
(d)    The fair value of the investment was determined using significant unobservable inputs.
[20]
(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.
[21]
(b)    Gross reductions include decreases in the cost basis of investments resulting from principal repayments, sales and return of capital.
[22] (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.
[23] The interest rate on these loans is subject to 3 Month SOFR, which as of September 30, 2024 was 4.59211%.
[24] Debt investment includes interest rate floor feature.
[25] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2023 was 5.15772%.
[26] PIK non-accrual investment.
[27] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2023 was 5.35472%.
[28] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2023 was 3.90900%.
[29] The interest rate on these loans is subject to 3 Month EURIBOR, which as of September 30, 2024 was 3.27900%.
[30] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2023 was 4.31000%.
[31] The interest rate on these loans is subject to 6 Month BBSY, which as of September 30, 2024 was 4.62210%.
[32] The interest rate on these loans is subject to 1 Month SOFR, which as of September 30, 2024 was 4.84570%.
[33] The interest rate on these loans is subject to 6 Month SOFR, which as of September 30, 2024 was 4.25387%.
[34] The interest rate on these loans is subject to 6 Month EURIBOR, which as of September 30, 2024 was 3.10500%.
[35] Non-accrual investment.
[36] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2023 was 5.20530%.
[37] The interest rate on these loans is subject to 3 Month SONIA, which as of September 30, 2024 was 4.81560%.
[38] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2023 was 3.86100%.
[39] The interest rate on these loans is subject to 6 Month SONIA, which as of September 30, 2024 was 4.64880%.
[40] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2023 was 5.13220%.
[41] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2023 was 4.44500%.
[42] The interest rate on these loans is subject to 3 Month BBSY, which as of September 30, 2024 was 4.43410%.
[43] The interest rate on these loans is subject to 1 Month EURIBOR, which as of September 30, 2024 was 3.35300%.
[44] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2023 was 4.05200%.
[45] The interest rate on these loans is subject to 3 Month STIBOR, which as of September 30, 2024 was 3.08400%.
[46] Non-accrual investment.
[47]
(d)    The fair value of the investment was determined using significant unobservable inputs.
[48]
(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.
[49]
(b)    Gross reductions include decreases in the cost basis of investments resulting from principal repayments, sales and return of capital.
[50]
(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.
[51] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2023 was 5.19920%.
[52] The interest rate on these loans is subject to 1 Month SONIA, which as of September 30, 2024 was 4.96030%.
[53] The interest rate on these loans is subject to 3 Month CDOR, which as of December 31, 2023 was 5.44750%.
[54] The interest rate on these loans is subject to 3 Month CORRA, which as of September 30, 2024 was 3.91955%.
[55] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2023 was 3.84500%.
[56] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2023 was 4.35750%.
[57] The interest rate on these loans is subject to 3 Month BKBM, which as of September 30, 2024 was 5.05000%
[58] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2023 was 5.63000%.
[59] The interest rate on these loans is subject to 3 Month SARON, which as of September 30, 2024 was 1.19930%
[60] The interest rate on these loans is subject to 6 Month SARON, which as of December 31, 2023 was 1.69524%.
[61] 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.
[62] 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.
[63] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2023 was 4.59000%.
[64] The interest rate on these loans is subject to 1 Month NIBOR, which as of September 30, 2024 was 4.64000%.
[65] The interest rate on these loans is subject to 1 Month BBSY, which as of September 30, 2024 was 4.30210%.
[66] The interest rate on these loans is subject to 6 Month SARON, which as of September 30, 2024 was 1.31390%.
[67] The interest rate on these loans is subject to 1 Month CDOR, which as of December 31, 2023 was 5.45500%.
[68] The interest rate on these loans is subject to 1 Month CORRA, which as of September 30, 2024 was 4.16088%.