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Unaudited Consolidated Schedule of Investments - Schedule Of Investments (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 2,449,272  
Fair value at ending balance 2,571,228 $ 2,449,272
February 21, 2019 | Line of Credit    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Commitment aggregate amount $ 800,000 $ 800,000
Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 9.10% [1],[2] 9.10% [3],[4],[5]
Sierra Senior Loan Strategy JV I LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 89.01% [1],[2],[6] 89.01% [3],[4],[7]
Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 16.00% [1],[8] 16.00% [3],[9]
Waccamaw River, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 20.00% [1],[2] 20.00% [3],[4]
Investment, Identifier [Axis]: 1WorldSync, Inc., First Lien Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12] $ 7,030  
Interest [10],[11],[12] 4.75%  
Interest [10],[11],[12] 9.20%  
Investment, Identifier [Axis]: 1WorldSync, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 7,049  
Fair value at ending balance [13],[14],[15]   $ 7,049
Interest [13],[14],[15]   4.75%
Interest [13],[14],[15]   9.50%
Investment, Identifier [Axis]: A.T. Holdings II LTD, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15],[16] 8,479  
Fair value at ending balance $ 8,303 [2],[12],[17] $ 8,479 [4],[15],[16]
Interest 6.70% [2],[12],[17] 6.70% [4],[15],[16]
Investment, interest rate, paid in kind 7.60% [2],[12],[17] 7.60% [4],[15],[16]
Investment, Identifier [Axis]: AD Bidco, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 10,099  
Fair value at ending balance $ 10,073 [10],[11],[12],[18] $ 10,099 [5],[13],[14],[15]
Interest 5.25% [10],[11],[12],[18] 5.25% [5],[13],[14],[15]
Interest 9.50% [10],[11],[12],[18] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: AD Bidco, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ 0 [5],[13],[14],[15]
Interest 5.25% [10],[11],[12],[18] 5.25% [5],[13],[14],[15]
Interest 9.50% [10],[11],[12],[18] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: ADB Safegate, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 6,523  
Fair value at ending balance $ 7,315 [2],[10],[11] $ 6,523 [4],[13],[14],[15]
Interest 9.25% [2],[10],[11] 9.25% [4],[13],[14],[15]
Interest 13.60% [2],[10],[11] 13.70% [4],[13],[14],[15]
Investment, Identifier [Axis]: AIT Worldwide Logistics Holdings, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 550  
Fair value at ending balance $ 587 [8],[12] $ 550 [9],[15]
Investment owned, balance (in shares) 348.68 [8],[12] 348.68 [9],[15]
Investment, Identifier [Axis]: AMMC CLO 22, Limited Series 2018-22A, Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[7],[15] $ 1,733  
Fair value at ending balance 469 [2],[6],[12] $ 1,733 [4],[7],[15]
Investment, Identifier [Axis]: APC1 Holding, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] 2,370  
Fair value at ending balance $ 2,484 [2],[11],[12],[20] $ 2,370 [4],[14],[15],[19]
Interest 5.40% [2],[11],[12],[20] 5.40% [4],[14],[15],[19]
Interest 7.60% [2],[11],[12],[20] 8.70% [4],[14],[15],[19]
Investment, Identifier [Axis]: APOG Bidco Pty Ltd, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[21] $ 864  
Fair value at ending balance [4],[14],[15],[21]   $ 864
Interest [4],[14],[15],[21]   7.30%
Interest [4],[14],[15],[21]   12.00%
Investment, Identifier [Axis]: ASC Communications, LLC, Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] 869  
Fair value at ending balance $ 935 [8],[12] $ 869 [15]
Investment owned, balance (in shares) 25,718.2 [8],[12] 25,718.2 [15]
Investment, Identifier [Axis]: ASC Communications, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 7,344  
Fair value at ending balance $ 6,601 [11],[12],[23] $ 7,344 [14],[15],[22]
Interest 4.75% [11],[12],[23] 4.75% [14],[15],[22]
Interest 9.20% [11],[12],[23] 9.40% [14],[15],[22]
Investment, Identifier [Axis]: ASC Communications, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[23] $ 0 [5],[14],[15],[22]
Interest 4.75% [11],[12],[18],[23] 4.75% [5],[14],[15],[22]
Interest 9.20% [11],[12],[18],[23] 9.40% [5],[14],[15],[22]
Investment, Identifier [Axis]: ATL II MRO Holdings Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 19,021  
Fair value at ending balance $ 19,013 [10],[11],[12] $ 19,021 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.25% [13],[14],[15]
Interest 9.80% [10],[11],[12] 9.80% [13],[14],[15]
Investment, Identifier [Axis]: ATL II MRO Holdings Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (49)  
Fair value at ending balance $ (43) [10],[11],[12],[18] $ (49) [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.25% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 9.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: AVSC Holding Corp., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[23] $ 2  
Interest [11],[12],[23] 5.50%  
Interest [11],[12],[23] 10.20%  
Investment, Identifier [Axis]: AVSC Holding Corp., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[22] $ 148  
Fair value at ending balance [14],[22]   $ 148
Interest [14],[22]   3.50%
Interest [14],[22]   8.20%
Investment, Identifier [Axis]: AVSC Holding Corp., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[22] 2  
Fair value at ending balance [14],[22]   $ 2
Interest [14],[22]   5.50%
Interest [14],[22]   10.20%
Investment, Identifier [Axis]: Accelerant Holdings, Class A Convertible Preferred Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] 6,347  
Fair value at ending balance $ 6,472 [8],[12] $ 6,347 [9],[15]
Investment owned, balance (in shares) 5,018 [8],[12] 5,018 [9],[15]
Investment, Identifier [Axis]: Accelerant Holdings, Class B Convertible Preferred Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 2,285  
Fair value at ending balance $ 2,375 [8],[12] $ 2,285 [9],[15]
Investment owned, balance (in shares) 1,657 [8],[12] 1,657 [9],[15]
Investment, Identifier [Axis]: Accelerant Holdings, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 7,840  
Fair value at ending balance $ 8,287 [8],[12] $ 7,840 [9],[15]
Investment owned, balance (in shares) 4,243 [8],[12] 4,243 [9],[15]
Investment, Identifier [Axis]: Accelevation LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[18],[23] $ 2,939  
Interest [11],[12],[18],[23] 5.00%  
Interest [11],[12],[18],[23] 9.30%  
Investment, Identifier [Axis]: Accelevation LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[18],[23] $ 104  
Interest [11],[12],[18],[23] 5.00%  
Interest [11],[12],[18],[23] 9.30%  
Investment, Identifier [Axis]: Acclime Holdings HK Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[24] $ 2,438  
Fair value at ending balance $ 2,470 [2],[11],[12],[25] $ 2,438 [4],[14],[15],[24]
Interest 6.38% [2],[11],[12],[25] 6.75% [4],[14],[15],[24]
Interest 10.70% [2],[11],[12],[25] 11.80% [4],[14],[15],[24]
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 437,623.3 [8],[12] 437,623.3 [9],[15]
Investment, Identifier [Axis]: Accurus Aerospace Corporation, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 11,612  
Fair value at ending balance $ 11,738 [10],[11],[12] $ 11,612 [13],[14],[15]
Interest 5.75% [10],[11],[12] 5.75% [13],[14],[15]
Interest 10.20% [10],[11],[12] 10.30% [13],[14],[15]
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 1,768  
Fair value at ending balance $ 2,398 [10],[11],[12],[18] $ 1,768 [5],[13],[14],[15]
Interest 5.75% [10],[11],[12],[18] 5.75% [5],[13],[14],[15]
Interest 10.20% [10],[11],[12],[18] 10.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: Acogroup, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 5,412  
Fair value at ending balance $ 5,497 [2],[11],[12],[20] $ 5,412 [4],[14],[15],[26]
Interest 2.90% [2],[11],[12],[20] 2.90% [4],[14],[15],[26]
Interest 4.00% [2],[11],[12],[20] 4.00% [4],[14],[15],[26]
Investment, interest rate, paid in kind 6.40% [2],[11],[12],[20] 6.60% [4],[14],[15],[26]
Investment, Identifier [Axis]: Adhefin International, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 1,716  
Fair value at ending balance $ 1,784 [2],[11],[12],[18],[20] $ 1,716 [4],[5],[14],[15],[19]
Interest 5.75% [2],[11],[12],[18],[20] 5.75% [4],[5],[14],[15],[19]
Interest 8.10% [2],[11],[12],[18],[20] 9.10% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Adhefin International, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 326  
Fair value at ending balance $ 345 [2],[11],[12],[20] $ 326 [4],[14],[15],[19]
Interest 10.50% [2],[11],[12],[20] 10.50% [4],[14],[15],[19]
Investment, interest rate, paid in kind 14.40% [2],[11],[12],[20] 13.20% [4],[14],[15],[19]
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Class A1 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 593  
Fair value at ending balance $ 581 [8],[12] $ 593 [9],[15]
Investment owned, balance (in shares) 8,717.76 [8],[12] 8,717.76 [9],[15]
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Class A2 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 153  
Fair value at ending balance $ 150 [8],[12] $ 153 [9],[15]
Investment owned, balance (in shares) 2,248.46 [8],[12] 2,248.46 [9],[15]
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Class B1 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 8,717.76 [8],[12] 8,717.76 [9],[15]
Investment, Identifier [Axis]: Advantage Software Company (The), LLC, Class B2 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 2,248.46 [8],[12] 2,248.46 [9],[15]
Investment, Identifier [Axis]: Air Canada 2020-2 Class B Pass Through Trust, Structured Secured Note - Class B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 2,411  
Fair value at ending balance $ 2,393 $ 2,411
Interest 9.00% 9.00%
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 2,710  
Fair value at ending balance $ 3,260 [10],[11],[12] $ 2,710 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.00% [13],[14],[15]
Interest 9.30% [10],[11],[12] 9.40% [13],[14],[15]
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 3,828  
Fair value at ending balance $ 3,270 [10],[11],[12],[18] $ 3,828 [5],[13],[14],[15]
Interest 5.75% [10],[11],[12],[18] 5.75% [5],[13],[14],[15]
Interest 10.10% [10],[11],[12],[18] 10.20% [5],[13],[14],[15]
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ 0 [5],[13],[14],[15]
Interest 5.75% [10],[11],[12],[18] 5.75% [5],[13],[14],[15]
Interest 10.10% [10],[11],[12],[18] 10.20% [5],[13],[14],[15]
Investment, Identifier [Axis]: AlliA Insurance Brokers NV, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[26] $ 4,569  
Fair value at ending balance $ 4,797 [2],[11],[12],[18],[20] $ 4,569 [4],[5],[14],[15],[26]
Interest 7.00% [2],[11],[12],[18],[20] 5.75% [4],[5],[14],[15],[26]
Interest 9.40% [2],[11],[12],[18],[20] 8.90% [4],[5],[14],[15],[26]
Investment, Identifier [Axis]: Alpine SG, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14],[15] $ 22,949  
Fair value at ending balance $ 12,775 [6],[10],[11],[12] $ 22,949 [7],[13],[14],[15]
Interest 6.50% [6],[10],[11],[12] 6.00% [7],[13],[14],[15]
Interest 10.90% [6],[10],[11],[12] 10.70% [7],[13],[14],[15]
Investment, Identifier [Axis]: Amalfi Midco, Class B Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 1,239  
Fair value at ending balance $ 2,553 [2],[8],[12] $ 1,239 [4],[9],[15]
Investment owned, balance (in shares) 98,906,608 [2],[8],[12] 98,906,608 [4],[9],[15]
Investment, Identifier [Axis]: Amalfi Midco, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 290  
Fair value at ending balance $ 311 [2],[12] $ 290 [4],[15]
Interest [4],[15]   17.50%
Investment, interest rate, paid in kind [2],[12] 17.50%  
Investment, Identifier [Axis]: Amalfi Midco, Subordinated Loan Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 5,492  
Fair value at ending balance $ 5,819 [2],[12] $ 5,492 [4],[15]
Interest 2.00% [2],[12] 2.00% [4],[15]
Investment, interest rate, paid in kind 9.00% [2],[12] 9.00% [4],[15]
Investment, Identifier [Axis]: Amalfi Midco, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 919  
Fair value at ending balance $ 1,075 [2],[8],[12] $ 919 [4],[9],[15]
Investment owned, balance (in shares) 380,385 [2],[8],[12] 380,385 [4],[9],[15]
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 119  
Fair value at ending balance $ 120 [8],[12] $ 119 [9],[15]
Investment owned, balance (in shares) 88,110 [8],[12] 88,110 [9],[15]
Investment, Identifier [Axis]: Americo Chemical Products, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 2,611  
Fair value at ending balance $ 2,557 [11],[12],[23] $ 2,611 [14],[15],[22]
Interest 5.00% [11],[12],[23] 5.00% [14],[15],[22]
Interest 9.30% [11],[12],[23] 9.60% [14],[15],[22]
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ (7)  
Fair value at ending balance $ (8) [11],[12],[18],[23] $ (7) [5],[14],[15],[22]
Interest 5.00% [11],[12],[18],[23] 5.00% [5],[14],[15],[22]
Interest 9.30% [11],[12],[18],[23] 9.60% [5],[14],[15],[22]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 2,995  
Fair value at ending balance $ 4,076 [2],[11],[12],[20] $ 2,995 [4],[14],[15],[19]
Interest 6.08% [2],[11],[12],[20] 6.20% [4],[14],[15],[19]
Interest 8.60% [2],[11],[12],[20] 9.30% [4],[14],[15],[19]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,576  
Fair value at ending balance $ 1,657 [2],[11],[12],[27] $ 1,576 [4],[14],[15],[26]
Interest 6.83% [2],[11],[12],[27] 6.20% [4],[14],[15],[26]
Interest 10.10% [2],[11],[12],[27] 9.90% [4],[14],[15],[26]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 904  
Fair value at ending balance $ 1,011 [2],[10],[11],[12] $ 904 [4],[14],[15],[26]
Interest 6.08% [2],[10],[11],[12] 6.95% [4],[14],[15],[26]
Interest 10.70% [2],[10],[11],[12] 10.70% [4],[14],[15],[26]
Investment, Identifier [Axis]: AnalytiChem Holding GmbH, First Lien Senior Secured Term Loan 4    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 1,008  
Fair value at ending balance [4],[13],[14],[15]   $ 1,008
Interest [4],[13],[14],[15]   6.20%
Interest [4],[13],[14],[15]   11.50%
Investment, Identifier [Axis]: Apex Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[28] 3,180  
Fair value at ending balance [4],[14],[15],[28]   $ 3,180
Interest [4],[14],[15],[28]   6.25%
Interest [4],[14],[15],[28]   11.30%
Investment, Identifier [Axis]: Apex Bidco Limited, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[29] $ 1,830  
Interest [2],[11],[12],[29] 6.50%  
Interest [2],[11],[12],[29] 11.10%  
Investment, Identifier [Axis]: Apex Bidco Limited, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[29] $ 1,399  
Interest [2],[11],[12],[29] 7.00%  
Interest [2],[11],[12],[29] 11.60%  
Investment, Identifier [Axis]: Apex Bidco Limited, Subordinated Senior Unsecured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 297  
Fair value at ending balance $ 310 [2],[12] $ 297 [4],[15]
Investment, interest rate, paid in kind 8.00% [2],[12] 8.00% [4],[15]
Investment, Identifier [Axis]: Apidos CLO XXIV, Series 2016-24A, Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[7] $ 3,272  
Fair value at ending balance 2,429 [2],[6] $ 3,272 [4],[7]
Investment, Identifier [Axis]: Aptus 1829. GmbH, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] 0  
Fair value at ending balance $ 0 [2],[8],[12] $ 0 [4],[9],[15]
Investment owned, balance (in shares) 48 [2],[8],[12] 48 [4],[9],[15]
Investment, Identifier [Axis]: Aptus 1829. GmbH, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,994  
Fair value at ending balance $ 2,082 [2],[11],[12],[27] $ 1,994 [4],[14],[15],[26]
Interest 5.75% [2],[11],[12],[27] 5.75% [4],[14],[15],[26]
Interest 8.30% [2],[11],[12],[27] 8.40% [4],[14],[15],[26]
Investment, Identifier [Axis]: Aptus 1829. GmbH, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 40  
Fair value at ending balance $ 49 [2],[8],[12] $ 40 [4],[9],[15]
Investment owned, balance (in shares) 13 [2],[8],[12] 13 [4],[9],[15]
Investment, Identifier [Axis]: Apus Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 3,608  
Fair value at ending balance $ 3,718 [2],[11],[12],[31] $ 3,608 [4],[14],[15],[30]
Interest 5.50% [2],[11],[12],[31] 5.50% [4],[14],[15],[30]
Interest 10.20% [2],[11],[12],[31] 10.70% [4],[14],[15],[30]
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[28] $ 6,314  
Fair value at ending balance $ 6,481 [2],[11],[12],[31] $ 6,314 [4],[5],[14],[15],[28]
Interest 6.00% [2],[11],[12],[31] 6.00% [4],[5],[14],[15],[28]
Interest 10.60% [2],[11],[12],[31] 10.60% [4],[5],[14],[15],[28]
Investment, Identifier [Axis]: Aquavista Watersides 2 LTD, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[28] $ 2,119  
Fair value at ending balance $ 2,166 [2],[11],[12],[31] $ 2,119 [4],[14],[15],[28]
Interest 10.50% [2],[11],[12],[31] 10.50% [4],[14],[15],[28]
Investment, interest rate, paid in kind 15.60% [2],[11],[12],[31] 15.10% [4],[14],[15],[28]
Investment, Identifier [Axis]: Arc Education, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 3,807  
Fair value at ending balance $ 3,982 [2],[11],[12],[18],[20] $ 3,807 [4],[5],[14],[15],[19]
Interest 5.65% [2],[11],[12],[18],[20] 5.97% [4],[5],[14],[15],[19]
Interest 8.00% [2],[11],[12],[18],[20] 9.30% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Arch Global Precision LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 8,769  
Fair value at ending balance $ 8,805 [10],[11],[12] $ 8,769 [13],[14],[15]
Interest 4.75% [10],[11],[12] 4.75% [13],[14],[15]
Interest 9.10% [10],[11],[12] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: Archimede, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 5,676  
Fair value at ending balance $ 6,042 [2],[11],[12],[20] $ 5,676 [4],[14],[15],[19]
Interest 6.50% [2],[11],[12],[20] 6.50% [4],[14],[15],[19]
Interest 8.90% [2],[11],[12],[20] 9.80% [4],[14],[15],[19]
Investment, Identifier [Axis]: Argus Bidco Limited, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 0  
Fair value at ending balance $ 0 [2],[8],[12] $ 0 [4],[9],[15]
Investment owned, balance (in shares) 464 [2],[8],[12] 464 [4],[9],[15]
Investment, Identifier [Axis]: Argus Bidco Limited, Equity Loan Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 33  
Fair value at ending balance $ 31 [2],[12] $ 33 [4],[15]
Investment owned, balance (in shares) 41,560 [2],[12] 41,560 [4],[15]
Investment, interest rate, paid in kind 10.00% [2],[12] 10.00% [4],[15]
Investment, Identifier [Axis]: Argus Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[18],[31] $ 1,607  
Interest [2],[11],[12],[18],[31] 4.00%  
Interest [2],[11],[12],[18],[31] 8.90%  
Investment, interest rate, paid in kind [2],[11],[12],[18],[31] 2.80%  
Investment, Identifier [Axis]: Argus Bidco Limited, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 1,773  
Fair value at ending balance $ 1,826 [2],[11],[12],[27] $ 1,773 [4],[14],[15],[19]
Interest 4.00% [2],[11],[12],[27] 4.00% [4],[14],[15],[19]
Interest 7.20% [2],[11],[12],[27] 7.20% [4],[14],[15],[19]
Investment, interest rate, paid in kind 2.80% [2],[11],[12],[27] 2.80% [4],[14],[15],[19]
Investment, Identifier [Axis]: Argus Bidco Limited, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 127  
Fair value at ending balance $ 125 [2],[11],[12],[25] $ 127 [4],[13],[14],[15]
Interest 4.00% [2],[11],[12],[25] 4.00% [4],[13],[14],[15]
Interest 8.80% [2],[11],[12],[25] 8.80% [4],[13],[14],[15]
Investment, interest rate, paid in kind 3.30% [2],[11],[12],[25] 2.80% [4],[13],[14],[15]
Investment, Identifier [Axis]: Argus Bidco Limited, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[28] $ 1,584  
Fair value at ending balance [4],[5],[14],[15],[28]   $ 1,584
Interest [4],[5],[14],[15],[28]   4.00%
Interest [4],[5],[14],[15],[28]   8.90%
Investment, interest rate, paid in kind [4],[5],[14],[15],[28]   2.80%
Investment, Identifier [Axis]: Argus Bidco Limited, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] 33  
Fair value at ending balance $ 31 [2],[12] $ 33 [4],[15]
Investment owned, balance (in shares) 41,560 [2],[12] 41,560 [4],[15]
Investment, interest rate, paid in kind 10.00% [2],[12] 10.00% [4],[15]
Investment, Identifier [Axis]: Argus Bidco Limited, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 777  
Fair value at ending balance $ 792 [2],[12] $ 777 [4],[15]
Investment, interest rate, paid in kind 10.50% [2],[12] 10.50% [4],[15]
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 5,637  
Fair value at ending balance $ 5,709 [11],[12],[25] $ 5,637 [13],[14],[15]
Interest 5.50% [11],[12],[25] 5.50% [13],[14],[15]
Interest 9.70% [11],[12],[25] 10.10% [13],[14],[15]
Investment, Identifier [Axis]: Artemis Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 256  
Fair value at ending balance $ 270 [2],[11],[12],[18],[20] $ 256 [4],[5],[14],[15],[19]
Interest 5.00% [2],[11],[12],[18],[20] 5.00% [4],[5],[14],[15],[19]
Interest 7.50% [2],[11],[12],[18],[20] 8.00% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Astra Bidco Limited, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 396  
Fair value at ending balance $ 412 [2],[11],[12],[20] $ 396 [4],[14],[15],[19]
Interest 5.75% [2],[11],[12],[20] 5.50% [4],[14],[15],[19]
Interest 8.30% [2],[11],[12],[20] 8.50% [4],[14],[15],[19]
Investment, Identifier [Axis]: Astra Bidco Limited, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[30] $ 2,365  
Fair value at ending balance $ 2,493 [2],[11],[12],[18],[31] $ 2,365 [4],[5],[14],[15],[30]
Interest 5.75% [2],[11],[12],[18],[31] 5.75% [4],[5],[14],[15],[30]
Interest 10.50% [2],[11],[12],[18],[31] 10.50% [4],[5],[14],[15],[30]
Investment, Identifier [Axis]: Auxi International, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,351  
Fair value at ending balance $ 1,422 [2],[11],[12],[20] $ 1,351 [4],[14],[15],[26]
Interest 6.25% [2],[11],[12],[20] 7.25% [4],[14],[15],[26]
Interest 8.60% [2],[11],[12],[20] 10.40% [4],[14],[15],[26]
Investment, Identifier [Axis]: Auxi International, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 782  
Fair value at ending balance $ 813 [2],[11],[12],[31] $ 782 [4],[14],[15],[30]
Interest 6.25% [2],[11],[12],[31] 6.25% [4],[14],[15],[30]
Interest 10.70% [2],[11],[12],[31] 11.20% [4],[14],[15],[30]
Investment, Identifier [Axis]: Avance Clinical Bidco Pty Ltd, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[32] $ 1,967  
Fair value at ending balance $ 1,760 [2],[11],[12],[18],[33] $ 1,967 [4],[5],[14],[15],[32]
Interest 4.50% [2],[11],[12],[18],[33] 4.50% [4],[5],[14],[15],[32]
Interest 8.70% [2],[11],[12],[18],[33] 8.90% [4],[5],[14],[15],[32]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 288  
Fair value at ending balance $ 302 [8],[12] $ 288 [9],[15]
Investment owned, balance (in shares) 192,307.7 [8],[12] 192,307.7 [9],[15]
Investment, Identifier [Axis]: Azalea Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 4,785  
Fair value at ending balance $ 4,773 [11],[12],[23] $ 4,785 [5],[14],[15],[22]
Interest 5.25% [11],[12],[23] 5.25% [5],[14],[15],[22]
Interest 9.70% [11],[12],[23] 9.90% [5],[14],[15],[22]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[23] $ 0 [5],[14],[15],[22]
Interest 5.25% [11],[12],[18],[23] 5.25% [5],[14],[15],[22]
Interest 9.70% [11],[12],[18],[23] 9.90% [5],[14],[15],[22]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 1,805  
Fair value at ending balance $ 1,868 [12] $ 1,805 [15]
Investment, interest rate, paid in kind 12.00% [12] 12.00% [15]
Investment, Identifier [Axis]: BKF Buyer, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 1,045  
Fair value at ending balance $ 1,065 [8],[12] $ 1,045 [9],[15]
Investment owned, balance (in shares) 1,004,467 [8],[12] 1,004,467 [9],[15]
Investment, Identifier [Axis]: BKF Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 8,015  
Fair value at ending balance $ 8,008 [11],[12],[23] $ 8,015 [14],[15],[22]
Interest 5.00% [11],[12],[23] 5.00% [14],[15],[22]
Interest 9.30% [11],[12],[23] 9.30% [14],[15],[22]
Investment, Identifier [Axis]: BKF Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ (52)  
Fair value at ending balance $ (48) [11],[12],[18],[23] $ (52) [5],[14],[15],[22]
Interest 5.00% [11],[12],[18],[23] 5.00% [5],[14],[15],[22]
Interest 9.30% [11],[12],[18],[23] 9.30% [5],[14],[15],[22]
Investment, Identifier [Axis]: BNI Global, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[34] $ 9,302  
Fair value at ending balance $ 9,739 [11],[12],[35] $ 9,302 [14],[15],[34]
Interest 5.50% [11],[12],[35] 5.50% [14],[15],[34]
Interest 7.80% [11],[12],[35] 8.50% [14],[15],[34]
Investment, Identifier [Axis]: BPG Holdings IV Corp, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 12,560  
Fair value at ending balance $ 12,528 [10],[11],[12] $ 12,560 [13],[14],[15]
Interest 6.00% [10],[11],[12] 6.00% [13],[14],[15]
Interest 10.30% [10],[11],[12] 10.60% [13],[14],[15]
Investment, Identifier [Axis]: BVI Medical, Inc., Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[19] $ 9,482  
Fair value at ending balance [14],[15],[19]   $ 9,482
Interest [14],[15],[19]   9.50%
Interest [14],[15],[19]   12.80%
Investment, Identifier [Axis]: Bariacum S.A, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] 3,107  
Fair value at ending balance $ 3,169 [2],[11],[12],[27] $ 3,107 [4],[14],[15],[26]
Interest 4.75% [2],[11],[12],[27] 4.75% [4],[14],[15],[26]
Interest 7.30% [2],[11],[12],[27] 7.30% [4],[14],[15],[26]
Investment, Identifier [Axis]: Basin Innovation Group, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 13,949  
Fair value at ending balance $ 13,940 [10],[11],[12],[18] $ 13,949 [5],[14],[15],[22]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[14],[15],[22]
Interest 9.30% [10],[11],[12],[18] 9.50% [5],[14],[15],[22]
Investment, Identifier [Axis]: Basin Innovation Group, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ (28)  
Fair value at ending balance $ (25) [10],[11],[12],[18] $ (28) [5],[14],[15],[22]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[14],[15],[22]
Interest 9.30% [10],[11],[12],[18] 9.50% [5],[14],[15],[22]
Investment, Identifier [Axis]: Benify (Bennevis AB), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[36] $ 854  
Fair value at ending balance [4],[14],[15],[36]   $ 854
Interest [4],[14],[15],[36]   5.25%
Interest [4],[14],[15],[36]   8.40%
Investment, Identifier [Axis]: Beyond Risk Management, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] 5,322  
Fair value at ending balance $ 5,309 [10],[11],[12],[18] $ 5,322 [5],[13],[14],[15]
Interest 4.50% [10],[11],[12],[18] 4.50% [5],[13],[14],[15]
Interest 8.90% [10],[11],[12],[18] 9.20% [5],[13],[14],[15]
Investment, Identifier [Axis]: Bidwax, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 7,088  
Fair value at ending balance $ 7,546 [2],[11],[12],[27] $ 7,088 [4],[14],[15],[26]
Interest 6.40% [2],[11],[12],[27] 6.40% [4],[14],[15],[26]
Interest 9.20% [2],[11],[12],[27] 9.20% [4],[14],[15],[26]
Investment, Identifier [Axis]: Biolam Group, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[26],[37] $ 1,406  
Fair value at ending balance $ 1,153 [2],[11],[12],[18],[27],[38] $ 1,406 [4],[5],[14],[15],[26],[37]
Interest 4.25% [2],[11],[12],[18],[27],[38] 4.25% [4],[5],[14],[15],[26],[37]
Interest [4],[5],[14],[15],[26],[37]   5.50%
Investment, interest rate, paid in kind 8.20% [2],[11],[12],[18],[27],[38] 2.80% [4],[5],[14],[15],[26],[37]
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 [40] $ 0 [7],[15],[37],[39],[41] $ 4,869 [42]
Gross Additions 0 [39],[41],[43] 0 [40],[42],[44]
Gross Reductions 0 [39],[41],[45] 0 [40],[42],[46]
Amount of Realized Gain (Loss) 0 [39],[41] 0 [40],[42]
Amount of Unrealized Gain (Loss) 0 [39],[41] (4,869) [40],[42]
Fair value at ending balance [39],[41] 0 [6],[12],[38] 0 [7],[15],[37],[40]
Amount of Interest or Dividends Credited to Income $ 0 [39],[41],[47] $ 0 [40],[42],[48]
Investment, interest rate, paid in kind 10.00% [6],[12],[38],[39],[41] 10.00% [7],[15],[37],[42]
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 [40] $ 2,744 [7],[14],[15],[22],[37],[39],[41] $ 7,166 [42]
Gross Additions 0 [39],[41],[43] 1,114 [40],[42],[44]
Gross Reductions 0 [39],[41],[45] 0 [40],[42],[46]
Amount of Realized Gain (Loss) 0 [39],[41] 0 [40],[42]
Amount of Unrealized Gain (Loss) (105) [39],[41] (5,536) [40],[42]
Fair value at ending balance [39],[41] 2,639 [6],[12],[38] 2,744 [7],[14],[15],[22],[37],[40]
Amount of Interest or Dividends Credited to Income $ 0 [39],[41],[47] $ 1,028 [40],[42],[48]
Investment, interest rate, paid in kind 14.40% [6],[12],[38],[39],[41] 14.40% [7],[14],[15],[22],[37],[42]
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 [7],[9],[15] $ 0  
Fair value at ending balance $ 0 [6],[8],[12] $ 0 [7],[9],[15]
Investment owned, balance (in shares) 44.6 [6],[8],[12] 44.6 [7],[9],[15]
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0 [41] $ 0 [42]
Gross Additions 0 [41],[43] 0 [42],[44]
Gross Reductions 0 [41],[45] 0 [42],[46]
Amount of Realized Gain (Loss) 0 [41] 0 [42]
Amount of Unrealized Gain (Loss) 0 [41] 0 [42]
Fair value at ending balance [41] 0 0
Amount of Interest or Dividends Credited to Income $ 0 [41],[47] $ 0 [42],[48]
Investment owned, balance (in shares) 44.6 [41] 44.6 [42]
Investment, Identifier [Axis]: Bounteous, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 4,081  
Fair value at ending balance $ 4,079 [11],[12],[23] $ 4,081 [13],[14],[15]
Interest 4.75% [11],[12],[23] 4.75% [13],[14],[15]
Interest 9.20% [11],[12],[23] 9.40% [13],[14],[15]
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Municipal Revenue Bond    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 27,859  
Fair value at ending balance $ 28,002 $ 27,859
Interest 11.50% 11.50%
Investment, Identifier [Axis]: Bridger Aerospace Group Holdings, LLC, Preferred Stock- Series C    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 14,618  
Fair value at ending balance $ 14,874 [12] $ 14,618 [15]
Investment owned, balance (in shares) 14,618 [12] 14,618 [15]
Investment, interest rate, paid in kind 7.00% [12] 7.00% [15]
Investment, Identifier [Axis]: BrightSign LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 4,657  
Fair value at ending balance $ 4,645 [11],[12],[23] $ 4,657 [14],[15],[22]
Interest 5.50% [11],[12],[23] 5.50% [14],[15],[22]
Interest 9.90% [11],[12],[23] 10.20% [14],[15],[22]
Investment, Identifier [Axis]: BrightSign LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12] $ 1,251  
Investment owned, balance (in shares) [12] 1,107,492.71  
Investment, Identifier [Axis]: BrightSign LLC, LLC units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 1,174  
Fair value at ending balance [15]   $ 1,174
Investment owned, balance (in shares) [15]   1,107,492.71
Investment, Identifier [Axis]: BrightSign LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] 1,085  
Fair value at ending balance $ 1,085 [11],[12],[18],[23] $ 1,085 [5],[14],[15],[22]
Interest 5.50% [11],[12],[18],[23] 5.50% [5],[14],[15],[22]
Interest 9.90% [11],[12],[18],[23] 10.20% [5],[14],[15],[22]
Investment, Identifier [Axis]: Brightpay Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 386  
Fair value at ending balance [4],[5],[14],[15],[19]   $ 386
Interest [4],[5],[14],[15],[19]   5.00%
Interest [4],[5],[14],[15],[19]   8.20%
Investment, Identifier [Axis]: Brightpay Limited, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[20] $ 1,810  
Interest [2],[11],[12],[20] 5.00%  
Interest [2],[11],[12],[20] 7.40%  
Investment, interest rate, paid in kind [2],[11],[12],[20] 0.30%  
Investment, Identifier [Axis]: Brightpay Limited, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,720  
Fair value at ending balance $ 407 [2],[11],[12],[20] $ 1,720 [4],[14],[15],[26]
Interest 5.00% [2],[11],[12],[20] 5.00% [4],[14],[15],[26]
Interest 7.40% [2],[11],[12],[20] 8.60% [4],[14],[15],[26]
Investment, interest rate, paid in kind [4],[14],[15],[26]   0.30%
Investment, Identifier [Axis]: British Airways 2020-1 Class B Pass Through Trust, First Lien Senior Secured Bond    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 507  
Fair value at ending balance $ 481 $ 507
Interest 8.40% 8.40%
Investment, Identifier [Axis]: British Engineering Services Holdco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 14,454  
Fair value at ending balance $ 15,097 [2],[11],[12],[31] $ 14,454 [4],[14],[15],[30]
Interest 7.00% [2],[11],[12],[31] 7.00% [4],[14],[15],[30]
Interest 11.70% [2],[11],[12],[31] 12.70% [4],[14],[15],[30]
Investment, Identifier [Axis]: Broadstone Group UK LTD, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[18],[29] $ 3,117  
Interest [2],[11],[12],[18],[29] 5.50%  
Interest [2],[11],[12],[18],[29] 10.00%  
Investment, Identifier [Axis]: Brook & Whittle Holding Corp., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14] $ 2,461  
Fair value at ending balance $ 2,285 [6],[10],[11] $ 2,461 [7],[13],[14]
Interest 4.00% [6],[10],[11] 4.00% [7],[13],[14]
Interest 8.50% [6],[10],[11] 8.70% [7],[13],[14]
Investment, Identifier [Axis]: Brown Machine Group Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 5,716  
Fair value at ending balance $ 5,582 [10],[11],[12] $ 5,716 [14],[15],[22]
Interest 6.00% [10],[11],[12] 6.00% [14],[15],[22]
Interest 10.40% [10],[11],[12] 10.70% [14],[15],[22]
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 450  
Fair value at ending balance $ 450 [8],[12] $ 450 [9],[15]
Investment owned, balance (in shares) 455 [8],[12] 455 [9],[15]
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 4,364  
Fair value at ending balance $ 4,218 [10],[11],[12] $ 4,364 [14],[15],[24]
Interest 9.00% [10],[11],[12] 9.00% [14],[15],[24]
Interest 13.40% [10],[11],[12] 14.20% [14],[15],[24]
Investment, Identifier [Axis]: CAi Software, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 12,455  
Fair value at ending balance $ 12,498 [10],[11],[12] $ 12,455 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.25% [13],[14],[15]
Interest 9.60% [10],[11],[12] 10.10% [13],[14],[15]
Investment, Identifier [Axis]: CAi Software, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 1,246  
Fair value at ending balance $ 1,261 [10],[11],[12],[18] $ 1,246 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.25% [5],[13],[14],[15]
Interest 9.60% [10],[11],[12],[18] 10.10% [5],[13],[14],[15]
Investment, Identifier [Axis]: CCFF Buyer, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 5,809  
Fair value at ending balance $ 5,807 [11],[12],[18],[25] $ 5,809 [5],[13],[14],[15]
Interest 5.00% [11],[12],[18],[25] 5.25% [5],[13],[14],[15]
Interest 9.30% [11],[12],[18],[25] 9.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: CCFF Buyer, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 235  
Fair value at ending balance $ 238 [12] $ 235 [15]
Investment owned, balance (in shares) 233 [12] 233 [15]
Investment, Identifier [Axis]: CCFF Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (15)  
Fair value at ending balance $ (13) [11],[12],[18],[25] $ (15) [5],[13],[14],[15]
Interest 5.00% [11],[12],[18],[25] 5.25% [5],[13],[14],[15]
Interest 9.30% [11],[12],[18],[25] 9.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: CGI Parent, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 14,008  
Fair value at ending balance $ 13,831 [10],[11],[12] $ 14,008 [13],[14],[15]
Interest 4.50% [10],[11],[12] 4.50% [13],[14],[15]
Interest 8.80% [10],[11],[12] 9.10% [13],[14],[15]
Investment, Identifier [Axis]: CGI Parent, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 1,710  
Fair value at ending balance $ 1,909 [8],[12] $ 1,710 [9],[15]
Investment owned, balance (in shares) 657 [8],[12] 657 [9],[15]
Investment, Identifier [Axis]: CGI Parent, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 534 [10],[11],[12],[18] $ 0 [5],[13],[14],[15]
Interest 4.50% [10],[11],[12],[18] 4.50% [5],[13],[14],[15]
Interest 8.80% [10],[11],[12],[18] 9.10% [5],[13],[14],[15]
Investment, Identifier [Axis]: CM Acquisitions Holdings Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 12,140  
Fair value at ending balance [13],[14],[15]   $ 12,140
Interest [13],[14],[15]   6.00%
Interest [13],[14],[15]   7.80%
Investment, interest rate, paid in kind [13],[14],[15]   2.50%
Investment, Identifier [Axis]: CM Acquisitions Holdings Inc., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] 1,523  
Fair value at ending balance $ 1,540 [10],[11],[12] $ 1,523 [13],[14],[15]
Interest 3.50% [10],[11],[12] 6.00% [13],[14],[15]
Interest 5.30% [10],[11],[12] 7.80% [13],[14],[15]
Investment, interest rate, paid in kind 2.50% [10],[11],[12] 2.50% [13],[14],[15]
Investment, Identifier [Axis]: CM Acquisitions Holdings Inc., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12] $ 12,167  
Interest [10],[11],[12] 3.50%  
Interest [10],[11],[12] 5.30%  
Investment, interest rate, paid in kind [10],[11],[12] 2.50%  
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 3,381  
Fair value at ending balance $ 3,398 [10],[11],[12] $ 3,381 [13],[14],[15]
Interest 5.25% [10],[11],[12] 5.25% [13],[14],[15]
Interest 9.50% [10],[11],[12] 9.50% [13],[14],[15]
Investment, interest rate, paid in kind 0.30% [10],[11],[12] 0.30% [13],[14],[15]
Investment, Identifier [Axis]: CMT Opco Holding, LLC (Concept Machine), LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 12,634.8 [8],[12] 12,635 [9],[15]
Investment, Identifier [Axis]: CSL DualCom, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[49] $ 2,016  
Fair value at ending balance $ 2,229 [2],[11],[12],[50] $ 2,016 [4],[5],[14],[15],[49]
Interest 4.75% [2],[11],[12],[50] 4.75% [4],[5],[14],[15],[49]
Interest 9.20% [2],[11],[12],[50] 9.50% [4],[5],[14],[15],[49]
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, 2024 LIFO Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 4,211  
Fair value at ending balance $ 4,370 [10],[11],[12] $ 4,211 [13],[14],[15]
Interest 10.00% [10],[11],[12] 10.00% [13],[14],[15]
Investment, interest rate, paid in kind 14.70% [10],[11],[12] 14.70% [13],[14],[15]
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 695  
Fair value at ending balance $ 800 [8],[12] $ 695 [9],[15]
Investment owned, balance (in shares) 21,031 [8],[12] 21,031 [9],[15]
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, First Out Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 2,860  
Fair value at ending balance [13],[14],[15]   $ 2,860
Interest [13],[14],[15]   10.00%
Investment, interest rate, paid in kind [13],[14],[15]   14.70%
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, First Out Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12] $ 809  
Interest [10],[11],[12] 7.00%  
Investment, interest rate, paid in kind [10],[11],[12] 11.60%  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, First Out Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12] $ 2,154  
Interest [10],[11],[12] 10.00%  
Investment, interest rate, paid in kind [10],[11],[12] 14.70%  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Second Out Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 597  
Fair value at ending balance $ 618 [10],[11],[12] $ 597 [13],[14],[15]
Interest 9.00% [10],[11],[12] 12.00% [13],[14],[15]
Investment, interest rate, paid in kind 13.60% [10],[11],[12] 16.70% [13],[14],[15]
Investment, Identifier [Axis]: CW Group Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 2,732  
Fair value at ending balance $ 2,725 [10],[11],[12] $ 2,732 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.00% [13],[14],[15]
Interest 9.40% [10],[11],[12] 9.80% [13],[14],[15]
Investment, Identifier [Axis]: CW Group Holdings, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 371  
Fair value at ending balance $ 427 [12] $ 371 [15]
Investment owned, balance (in shares) 161,290.32 [12] 161,290.32 [15]
Investment, Identifier [Axis]: Caldwell & Gregory LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 18,833  
Fair value at ending balance $ 19,062 [10],[11],[12],[18] $ 18,833 [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: Caldwell & Gregory LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (34)  
Fair value at ending balance $ (31) [10],[11],[12],[18] $ (34) [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Class A Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 0  
Fair value at ending balance $ 0 [2],[8],[12] $ 0 [4],[9],[15]
Investment owned, balance (in shares) 500,000 [2],[8],[12] 500,000 [4],[9],[15]
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Class C - Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 0  
Fair value at ending balance $ 0 [2],[8],[12] $ 0 [4],[9],[15]
Investment owned, balance (in shares) 74,712.64 [2],[8],[12] 74,712.64 [4],[9],[15]
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Class X Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 0  
Fair value at ending balance $ 0 [2],[8],[12] $ 0 [4],[9],[15]
Investment owned, balance (in shares) 45,604 [2],[8],[12] 45,604 [4],[9],[15]
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 0  
Fair value at ending balance $ 0 [2],[8],[12] $ 0 [4],[9],[15]
Investment owned, balance (in shares) 14.37 [2],[8],[12] 14.37 [4],[9],[15]
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[37],[51] $ 360  
Fair value at ending balance $ 302 [2],[11],[12],[38],[52] $ 360 [4],[14],[15],[37],[51]
Interest 7.00% [2],[11],[12],[38],[52] 7.00% [4],[14],[15],[37],[51]
Investment, interest rate, paid in kind 10.30% [2],[11],[12],[38],[52] 10.30% [4],[14],[15],[37],[51]
Investment, Identifier [Axis]: Canadian Orthodontic Partners Corp., Super Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[15] $ 185  
Fair value at ending balance $ 256 [2],[12],[18] $ 185 [4],[5],[15]
Investment, interest rate, paid in kind 15.00% [2],[12],[18] 15.00% [4],[5],[15]
Investment, Identifier [Axis]: Caribou Holding Company, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 4,236  
Fair value at ending balance [4],[13],[14],[15]   $ 4,236
Interest [4],[13],[14],[15]   7.64%
Interest [4],[13],[14],[15]   12.50%
Investment, Identifier [Axis]: Caribou Holding Company, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] 682  
Fair value at ending balance [4],[9],[15]   $ 682
Investment owned, balance (in shares) [4],[9],[15]   681,818
Investment, Identifier [Axis]: Cascade Residential Services LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] 3,742  
Fair value at ending balance $ 3,769 [10],[11],[12],[18] $ 3,742 [5],[13],[14],[15]
Interest 6.00% [10],[11],[12],[18] 6.00% [5],[13],[14],[15]
Interest 10.30% [10],[11],[12],[18] 10.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: Cascade Residential Services LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 312  
Fair value at ending balance $ 298 [10],[11],[12],[18] $ 312 [13],[14],[15]
Interest 6.00% [10],[11],[12],[18] 6.00% [13],[14],[15]
Interest 10.30% [10],[11],[12],[18] 10.60% [13],[14],[15]
Investment, Identifier [Axis]: Catawba River Limited, Structured - Junior Note    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 2,365  
Fair value at ending balance 2,241 [2],[8],[12] $ 2,365 [4],[15]
Investment, Identifier [Axis]: Celebration Bidco, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] 11,262  
Fair value at ending balance $ 8,353 [8],[12] $ 11,262 [9],[15]
Investment owned, balance (in shares) 1,243,071 [8],[12] 1,243,071 [9],[15]
Investment, Identifier [Axis]: Celebration Bidco, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [53] $ 11,262 $ 12,177
Gross Additions 0 [54],[55] 0 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (2,909) [55] (915) [53]
Fair value at ending balance 8,353 [55] 11,262 [53]
Amount of Interest or Dividends Credited to Income $ 0 [55],[59] $ 0 [53],[60]
Investment owned, balance (in shares) 1,243,071 [55] 1,243,071 [53]
Investment, Identifier [Axis]: Celebration Bidco, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[15] $ 6,414  
Fair value at ending balance $ 7,654 [10],[12] $ 6,414 [13],[15]
Interest 8.00% [10],[12] 8.00% [13],[15]
Investment, interest rate, paid in kind 12.30% [10],[12] 12.60% [13],[15]
Investment, Identifier [Axis]: Celebration Bidco, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [53] $ 6,414 $ 6,214
Gross Additions 1,504 [54],[55] 200 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (264) [55] 0 [53]
Fair value at ending balance 7,654 [55] 6,414 [53]
Amount of Interest or Dividends Credited to Income $ 221 [55],[59] $ 837 [53],[60]
Interest 8.00% [55] 8.00% [53]
Investment, interest rate, paid in kind 12.30% [55] 12.60% [53]
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 2,996  
Fair value at ending balance [4],[14],[15],[19]   $ 2,996
Interest [4],[14],[15],[19]   5.25%
Interest [4],[14],[15],[19]   8.30%
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[20] $ 3,125  
Interest [2],[11],[12],[20] 5.25%  
Interest [2],[11],[12],[20] 7.80%  
Investment, Identifier [Axis]: Centralis Finco S.a.r.l., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[18],[20] $ 0  
Interest [2],[11],[12],[18],[20] 5.25%  
Interest [2],[11],[12],[18],[20] 7.80%  
Investment, Identifier [Axis]: Ceres Pharma NV, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 3,167  
Fair value at ending balance $ 3,317 [2],[11],[12],[27] $ 3,167 [4],[14],[15],[26]
Interest 6.00% [2],[11],[12],[27] 6.00% [4],[14],[15],[26]
Interest 8.90% [2],[11],[12],[27] 8.90% [4],[14],[15],[26]
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 $ 16,852 [9],[15],[55] $ 12,160 [53]
Gross Additions 0 [54],[55] 5,551 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) 3,131 [55] (859) [53]
Fair value at ending balance [55] 19,983 [8],[12] 16,852 [9],[15]
Amount of Interest or Dividends Credited to Income $ 0 [55],[59] $ 0 [53],[60]
Investment owned, balance (in shares) 3,518,097 [8],[12],[55] 3,518,097 [9],[15],[53]
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 $ 15,770 [15],[55] $ 15,649 [53]
Gross Additions 25 [54],[55] 95 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) 5 [55] 26 [53]
Fair value at ending balance [55] 15,800 [12] 15,770 [15]
Amount of Interest or Dividends Credited to Income $ 353 [55],[59] $ 1,428 [53],[60]
Interest 8.00% [12],[55] 8.00% [15],[53]
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 $ 7,271 [15],[55] $ 6,868 [53]
Gross Additions 10 [54],[55] 403 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) 4 [55] 0 [53]
Fair value at ending balance [55] 7,285 [12] 7,271 [15]
Amount of Interest or Dividends Credited to Income $ 160 [55],[59] $ 711 [53],[60]
Interest 8.00% [12],[55] 8.00% [15],[53]
Investment, Identifier [Axis]: Cobham Slip Rings SAS, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[24] $ 1,303  
Fair value at ending balance $ 1,303 [2],[10],[11],[12] $ 1,303 [4],[14],[15],[24]
Interest 6.25% [2],[10],[11],[12] 6.25% [4],[14],[15],[24]
Interest 10.60% [2],[10],[11],[12] 10.90% [4],[14],[15],[24]
Investment, Identifier [Axis]: Coherus Biosciences, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 3,903  
Fair value at ending balance $ 3,903 [10],[11],[12] $ 3,903 [13],[14],[15]
Interest 8.00% [10],[11],[12] 8.00% [13],[14],[15]
Interest 12.30% [10],[11],[12] 12.60% [13],[14],[15]
Investment, Identifier [Axis]: Coherus Biosciences, Inc., Royalty Rights    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 5,834  
Fair value at ending balance 6,379 [12] $ 5,834 [15]
Investment owned, balance (in shares) [15]   3,626,518
Investment, Identifier [Axis]: Command Alkon (Project Potter Buyer, LLC), Class B Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] 175  
Fair value at ending balance $ 151 [8],[12] $ 175 [9],[15]
Investment owned, balance (in shares) 33,324.7 [8],[12] 33,324.7 [9],[15]
Investment, Identifier [Axis]: Compass Precision, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 154  
Fair value at ending balance $ 257 [8],[12] $ 154 [9],[15]
Investment owned, balance (in shares) 46,085.6 [8],[12] 46,085.6 [9],[15]
Investment, Identifier [Axis]: Compass Precision, LLC, Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 640  
Fair value at ending balance $ 644 [12] $ 640 [15]
Interest 11.00% [12] 11.00% [15]
Investment, interest rate, paid in kind 1.00% [12] 1.00% [15]
Investment, Identifier [Axis]: Comply365, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 18,663  
Fair value at ending balance $ 18,188 [10],[11],[12] $ 18,663 [14],[15],[22]
Interest 5.00% [10],[11],[12] 5.00% [14],[15],[22]
Interest 9.40% [10],[11],[12] 9.70% [14],[15],[22]
Investment, Identifier [Axis]: Comply365, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 0  
Fair value at ending balance $ (25) [10],[11],[12],[18] $ 0 [5],[14],[15],[22]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[14],[15],[22]
Interest 9.40% [10],[11],[12],[18] 9.70% [5],[14],[15],[22]
Investment, Identifier [Axis]: Contabo Finco S.À.R.L, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 4,822  
Fair value at ending balance [4],[14],[15],[19]   $ 4,822
Interest [4],[14],[15],[19]   5.15%
Interest [4],[14],[15],[19]   8.20%
Investment, Identifier [Axis]: Contabo FincoS.À R.L, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[20] $ 5,030  
Interest [2],[11],[12],[20] 5.15%  
Interest [2],[11],[12],[20] 7.80%  
Investment, Identifier [Axis]: Coyo Uprising GmbH, Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 206  
Fair value at ending balance $ 217 [2],[8],[12] $ 206 [4],[9],[15]
Investment owned, balance (in shares) 440 [2],[8],[12] 440 [4],[9],[15]
Investment, Identifier [Axis]: Coyo Uprising GmbH, Class B Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 381  
Fair value at ending balance $ 412 [2],[8],[12] $ 381 [4],[9],[15]
Investment owned, balance (in shares) 191 [2],[8],[12] 191 [4],[9],[15]
Investment, Identifier [Axis]: Coyo Uprising GmbH, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 4,590  
Fair value at ending balance $ 4,804 [2],[11],[12],[18],[27] $ 4,590 [4],[5],[14],[15],[19]
Interest 6.50% [2],[11],[12],[18],[27] 6.50% [4],[5],[14],[15],[19]
Interest 9.30% [2],[11],[12],[18],[27] 10.10% [4],[5],[14],[15],[19]
Investment, interest rate, paid in kind 0.30% [2],[11],[12],[18],[27] 0.30% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: DAWGS Intermediate Holdings Co., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12] $ 6,752  
Interest [10],[11],[12] 4.50%  
Interest [10],[11],[12] 8.80%  
Investment, Identifier [Axis]: DAWGS Intermediate Holdings Co., LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[12] $ 347  
Investment owned, balance (in shares) [8],[12] 346.9  
Investment, Identifier [Axis]: DAWGS Intermediate Holdings Co., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ 64  
Interest [10],[11],[12],[18] 4.50%  
Interest [10],[11],[12],[18] 8.80%  
Investment, Identifier [Axis]: DISA Holdings Corp., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 6,950  
Fair value at ending balance $ 6,933 [10],[11],[12] $ 6,950 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.00% [13],[14],[15]
Interest 9.30% [10],[11],[12] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: DISA Holdings Corp., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 86 [10],[11],[12],[18] $ 0 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: DataServ Integrations, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 1,871  
Fair value at ending balance $ 1,871 [11],[12],[25] $ 1,871 [14],[15],[24]
Interest 5.50% [11],[12],[25] 5.50% [14],[15],[24]
Interest 10.00% [11],[12],[25] 10.00% [14],[15],[24]
Investment, Identifier [Axis]: DataServ Integrations, LLC, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 103  
Fair value at ending balance [9],[15]   $ 103
Investment owned, balance (in shares) [9],[15]   96,153.9
Investment, Identifier [Axis]: DataServ Integrations, LLC, Preferred Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[12] $ 117  
Investment owned, balance (in shares) [8],[12] 96,153.9  
Investment, Identifier [Axis]: DataServ Integrations, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[25] $ 0 [5],[14],[15],[24]
Interest 5.50% [11],[12],[18],[25] 5.50% [5],[14],[15],[24]
Interest 10.00% [11],[12],[18],[25] 10.00% [5],[14],[15],[24]
Investment, Identifier [Axis]: David Wood Baking UK Ltd, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 818  
Fair value at ending balance $ 849 [2],[11],[12],[31] $ 818 [4],[14],[15],[30]
Interest 10.00% [2],[11],[12],[31] 10.00% [4],[14],[15],[30]
Interest 14.70% [2],[11],[12],[31] 14.70% [4],[14],[15],[30]
Investment, Identifier [Axis]: DecksDirect, LLC, Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 1,016.1 [8],[12] 1,016.1 [9],[15]
Investment, Identifier [Axis]: DecksDirect, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 1,280.8 [8],[12] 1,280.8 [9],[15]
Investment, Identifier [Axis]: DecksDirect, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 1,383  
Fair value at ending balance $ 1,295 [10],[11],[12] $ 1,383 [13],[14],[15]
Interest 6.50% [10],[11],[12] 6.25% [13],[14],[15]
Interest 11.00% [10],[11],[12] 10.90% [13],[14],[15]
Investment, Identifier [Axis]: DecksDirect, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12] $ 0  
Investment owned, balance (in shares) [12] 9.5  
Investment, interest rate, paid in kind 13.00%  
Investment, Identifier [Axis]: DecksDirect, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 301  
Fair value at ending balance $ 191 [10],[11],[12],[18] $ 301 [5],[13],[14],[15]
Interest 6.50% [10],[11],[12],[18] 6.25% [5],[13],[14],[15]
Interest 11.00% [10],[11],[12],[18] 10.90% [5],[13],[14],[15]
Investment, Identifier [Axis]: Discovery Buyer, L.P., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ 12,261  
Interest [10],[11],[12],[18] 5.00%  
Interest [10],[11],[12],[18] 9.30%  
Investment, Identifier [Axis]: Discovery Buyer, L.P., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ (22)  
Interest [10],[11],[12],[18] 5.00%  
Interest [10],[11],[12],[18] 9.30%  
Investment, Identifier [Axis]: Diversified Packaging Holdings LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 333  
Fair value at ending balance $ 381 [12] $ 333 [9],[15]
Investment owned, balance (in shares) 2,769 [12] 2,769 [9],[15]
Investment, Identifier [Axis]: Diversified Packaging Holdings LLC, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 717  
Fair value at ending balance $ 792 [12] $ 717 [15]
Interest 11.00% [12] 11.00% [15]
Investment, interest rate, paid in kind 1.50% [12] 1.50% [15]
Investment, Identifier [Axis]: Dragon Bidco, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 2,585  
Fair value at ending balance $ 2,701 [2],[11],[12],[20] $ 2,585 [4],[14],[15],[19]
Interest 5.25% [2],[11],[12],[20] 5.50% [4],[14],[15],[19]
Interest 7.90% [2],[11],[12],[20] 8.60% [4],[14],[15],[19]
Investment, Identifier [Axis]: DreamStart Bidco SAS (d/b/a SmartTrade), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 2,202  
Fair value at ending balance $ 2,297 [2],[11],[12],[20] $ 2,202 [4],[14],[15],[19]
Interest 5.25% [2],[11],[12],[20] 5.25% [4],[14],[15],[19]
Interest 8.00% [2],[11],[12],[20] 8.60% [4],[14],[15],[19]
Investment, Identifier [Axis]: Dryden 49 Senior Loan Fund, Series 2017-49A, Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[7],[9] $ 437  
Fair value at ending balance 46 [2],[6],[8] $ 437 [4],[7],[9]
Investment, Identifier [Axis]: Dune Group, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] 91  
Fair value at ending balance $ 97 [2],[11],[12],[18],[27] $ 91 [4],[5],[14],[15],[19]
Interest 4.00% [2],[11],[12],[18],[27] 4.00% [4],[5],[14],[15],[19]
Interest 6.60% [2],[11],[12],[18],[27] 6.60% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Dune Group, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 193  
Fair value at ending balance $ 1,361 [2],[10],[11],[12] $ 193 [4],[13],[14],[15]
Interest 4.00% [2],[10],[11],[12] 4.00% [4],[13],[14],[15]
Interest 8.30% [2],[10],[11],[12] 8.80% [4],[13],[14],[15]
Investment, Identifier [Axis]: Dune Group, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 1,164  
Fair value at ending balance [4],[13],[14],[15]   $ 1,164
Interest [4],[13],[14],[15]   4.00%
Interest [4],[13],[14],[15]   6.30%
Investment, interest rate, paid in kind [4],[13],[14],[15]   2.30%
Investment, Identifier [Axis]: Dunlipharder B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] 998  
Fair value at ending balance $ 999 [2],[10],[11],[12] $ 998 [4],[13],[14],[15]
Interest 5.25% [2],[10],[11],[12] 5.25% [4],[13],[14],[15]
Interest 9.60% [2],[10],[11],[12] 9.90% [4],[13],[14],[15]
Investment, Identifier [Axis]: Dwyer Instruments, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 14,433  
Fair value at ending balance $ 14,422 [10],[11],[12] $ 14,433 [13],[14],[15]
Interest 4.75% [10],[11],[12] 4.75% [13],[14],[15]
Interest 9.10% [10],[11],[12] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: EB Development, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 1,971  
Fair value at ending balance $ 1,834 [2],[11],[12],[18],[20] $ 1,971 [4],[5],[14],[15],[19]
Interest 5.50% [2],[11],[12],[18],[20] 5.50% [4],[5],[14],[15],[19]
Interest 7.90% [2],[11],[12],[18],[20] 8.30% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: EFC International, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 380  
Fair value at ending balance $ 317 [8],[12] $ 380 [9],[15]
Investment owned, balance (in shares) 163.83 [8],[12] 163.83 [9],[15]
Investment, Identifier [Axis]: EFC International, Senior Unsecured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 797  
Fair value at ending balance $ 803 [12] $ 797 [15]
Interest 11.00% [12] 11.00% [15]
Investment, interest rate, paid in kind 2.50% [12] 2.50% [15]
Investment, Identifier [Axis]: EMI Porta Holdco LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 11,696  
Fair value at ending balance $ 11,599 [10],[11],[12] $ 11,696 [13],[14],[15]
Interest 5.75% [10],[11],[12] 5.75% [13],[14],[15]
Interest 10.20% [10],[11],[12] 10.50% [13],[14],[15]
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 543  
Fair value at ending balance $ 353 [11],[12],[18],[23] $ 543 [5],[13],[14],[15]
Interest 5.75% [11],[12],[18],[23] 5.75% [5],[13],[14],[15]
Interest 10.20% [11],[12],[18],[23] 10.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 417  
Fair value at ending balance $ 375 [8],[12] $ 417 [9],[15]
Investment owned, balance (in shares) 530.92 [8],[12] 530.92 [9],[15]
Investment, Identifier [Axis]: Echo Global Logistics, Inc., Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 9,450  
Fair value at ending balance $ 9,469 [11],[12],[23] $ 9,450 [14],[15],[22]
Interest 7.00% [11],[12],[23] 7.00% [14],[15],[22]
Interest 11.40% [11],[12],[23] 11.70% [14],[15],[22]
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 $ 10,100  
Fair value at ending balance 11,300 $ 10,100
Investment, Identifier [Axis]: Eclipse Business Capital, LLC units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 136,855 [55] 145,799 [53]
Gross Additions 23 [54],[55] 66 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (23) [55] (9,010) [53]
Fair value at ending balance [55] 136,855 136,855
Amount of Interest or Dividends Credited to Income $ 3,989 [55],[59] $ 14,894 [53],[60]
Investment owned, balance (in shares) 89,447,396 [55] 89,447,396 [53]
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 [15] $ 136,855  
Fair value at ending balance $ 136,855 [12] $ 136,855 [15]
Investment owned, balance (in shares) 89,447,396 [12] 89,447,396 [15]
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[15],[22] $ 10,091  
Fair value at ending balance $ 11,273 [12],[18],[23] $ 10,091 [5],[15],[22]
Interest 6.50% [12],[18],[23] 7.25% [5],[15],[22]
Interest 10.90% [12],[18],[23] 11.90% [5],[15],[22]
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 10,091 [55] $ 5,545 [53]
Gross Additions 1,727 [54],[55] 27,656 [53],[56]
Gross Reductions (547) [55],[57] (23,091) [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) 2 [55] (19) [53]
Fair value at ending balance [55] 11,273 10,091
Amount of Interest or Dividends Credited to Income $ 282 [55],[59] $ 817 [53],[60]
Interest 6.50% [55] 7.25% [53]
Interest 10.90% [55] 11.90% [53]
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 [15] $ 4,545  
Fair value at ending balance $ 4,545 [12] $ 4,545 [15]
Interest 7.50% [12] 7.50% [15]
Investment, Identifier [Axis]: Eclipse Business Capital, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 4,545 [55] $ 4,545 [53]
Gross Additions 2 [54],[55] 6 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (2) [55] (6) [53]
Fair value at ending balance [55] 4,545 4,545
Amount of Interest or Dividends Credited to Income $ 87 [55],[59] $ 323 [53],[60]
Interest 7.50% [55] 7.50% [53]
Investment, Identifier [Axis]: Electric Equipment & Engineering Co., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 307  
Fair value at ending balance $ 310 [12] $ 307 [15]
Interest 10.50% [12] 10.50% [15]
Investment, interest rate, paid in kind 3.00% [12] 3.00% [15]
Investment, Identifier [Axis]: Electric Equipment & Engineering Co., LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 188  
Fair value at ending balance $ 195 [8],[12] $ 188 [9],[15]
Investment owned, balance (in shares) 187,500 [8],[12] 187,500 [9],[15]
Investment, Identifier [Axis]: Electrical Components International, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ 10,410  
Fair value at ending balance $ 10,395 [10],[11],[12],[18] $ 10,410 [5],[14],[15],[24]
Interest 6.50% [10],[11],[12],[18] 6.50% [5],[14],[15],[24]
Interest 10.80% [10],[11],[12],[18] 11.30% [5],[14],[15],[24]
Investment, Identifier [Axis]: Ellkay, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 4,348  
Fair value at ending balance $ 4,478 [10],[11],[12] $ 4,348 [13],[14],[15]
Interest 7.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 10.00% [10],[11],[12] 8.00% [13],[14],[15]
Investment, interest rate, paid in kind 2.00% [10],[11],[12] 2.00% [13],[14],[15]
Investment, Identifier [Axis]: Entact Environmental Services, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 6,624  
Fair value at ending balance $ 6,495 [10],[11],[12] $ 6,624 [13],[14],[15]
Interest 5.75% [10],[11],[12] 5.75% [13],[14],[15]
Interest 10.00% [10],[11],[12] 10.40% [13],[14],[15]
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26],[37] $ 831  
Fair value at ending balance $ 836 [2],[11],[12],[27],[38] $ 831 [4],[14],[15],[26],[37]
Interest 7.00% [2],[11],[12],[27],[38] 7.00% [4],[14],[15],[26],[37]
Investment, interest rate, paid in kind 9.40% [2],[11],[12],[27],[38] 9.60% [4],[14],[15],[26],[37]
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15],[37] $ 453  
Fair value at ending balance $ 437 [2],[10],[11],[12],[38] $ 453 [4],[13],[14],[15],[37]
Interest 7.00% [2],[10],[11],[12],[38] 7.00% [4],[13],[14],[15],[37]
Investment, interest rate, paid in kind 12.40% [2],[10],[11],[12],[38] 11.30% [4],[13],[14],[15],[37]
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30],[37] $ 1,165  
Fair value at ending balance $ 1,158 [2],[11],[12],[31],[38] $ 1,165 [4],[14],[15],[30],[37]
Interest 7.00% [2],[11],[12],[31],[38] 7.00% [4],[14],[15],[30],[37]
Investment, interest rate, paid in kind 12.40% [2],[11],[12],[31],[38] 11.50% [4],[14],[15],[30],[37]
Investment, Identifier [Axis]: Eurofins Digital Testing International LUX Holding SARL, Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15],[37] $ 0  
Fair value at ending balance $ 0 [2],[12],[38] $ 0 [4],[15],[37]
Investment, interest rate, paid in kind 11.50% [2],[12],[38] 11.50% [4],[15],[37]
Investment, Identifier [Axis]: Events Software BidCo Pty Ltd, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[32] $ 1,336  
Fair value at ending balance $ 1,340 [2],[11],[12],[18],[33] $ 1,336 [4],[5],[14],[15],[32]
Interest 6.50% [2],[11],[12],[18],[33] 6.50% [4],[5],[14],[15],[32]
Interest 11.00% [2],[11],[12],[18],[33] 11.00% [4],[5],[14],[15],[32]
Investment, Identifier [Axis]: Expert Institute Group Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ 2,553  
Interest [10],[11],[12],[18] 4.50%  
Interest [10],[11],[12],[18] 8.80%  
Investment, Identifier [Axis]: Expert Institute Group Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ (14)  
Interest [10],[11],[12],[18] 4.50%  
Interest [10],[11],[12],[18] 8.80%  
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 5,955  
Fair value at ending balance $ 6,259 [10],[11],[12] $ 5,955 [13],[14],[15]
Interest 6.50% [10],[11],[12] 6.50% [13],[14],[15]
Interest 11.10% [10],[11],[12] 11.40% [13],[14],[15]
Investment, Identifier [Axis]: Express Wash Acquisition Company, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 124  
Fair value at ending balance $ 136 [10],[11],[12],[18] $ 124 [5],[13],[14],[15]
Interest 6.50% [10],[11],[12],[18] 6.50% [5],[13],[14],[15]
Interest 11.10% [10],[11],[12],[18] 11.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: FL Hawk Intermediate Holdings, Inc. (f.k.a. Fineline Technologies, Inc.), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 11,950  
Fair value at ending balance [13],[14],[15]   $ 11,950
Interest [13],[14],[15]   4.50%
Interest [13],[14],[15]   9.10%
Investment, Identifier [Axis]: FL Hawk Intermediate Holdings, Inc. (f/k/a Fineline Technologies, Inc.), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12] $ 11,998  
Interest [10],[11],[12] 4.50%  
Interest [10],[11],[12] 8.80%  
Investment, Identifier [Axis]: FSS Buyer LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 4,740  
Fair value at ending balance $ 4,728 [11],[12],[23] $ 4,740 [14],[15],[22]
Interest 5.00% [11],[12],[23] 5.00% [14],[15],[22]
Interest 9.30% [11],[12],[23] 9.60% [14],[15],[22]
Investment, Identifier [Axis]: FSS Buyer LLC, LP Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 17  
Fair value at ending balance $ 17 [12] $ 17 [15]
Investment owned, balance (in shares) 1,160.9 [12] 1,160.9 [15]
Investment, Identifier [Axis]: FSS Buyer LLC, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 74  
Fair value at ending balance $ 74 [8],[12] $ 74 [9],[15]
Investment owned, balance (in shares) 5,104.3 [8],[12] 5,104.3 [9],[15]
Investment, Identifier [Axis]: Faraday, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 1,552  
Fair value at ending balance $ 1,633 [2],[11],[12],[20] $ 1,552 [4],[5],[14],[15],[19]
Interest 6.10% [2],[11],[12],[20] 6.25% [4],[5],[14],[15],[19]
Interest 8.50% [2],[11],[12],[20] 9.60% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Ferrellgas L.P., Opco Preferred Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 2,799  
Fair value at ending balance $ 2,799 [12] $ 2,799 [15]
Investment owned, balance (in shares) 2,886 [12] 2,886 [15]
Investment, Identifier [Axis]: FinThrive Software Intermediate Holdings Inc., Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 5,608  
Fair value at ending balance $ 5,944 [12] $ 5,608 [15]
Investment owned, balance (in shares) 6,582.7 [12] 6,582.7 [15]
Investment, interest rate, paid in kind 11.00% [12] 11.00% [15]
Investment, Identifier [Axis]: Finaxy Holding, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 3,872  
Fair value at ending balance $ 3,994 [2],[11],[12],[27] $ 3,872 [4],[14],[15],[26]
Interest 5.25% [2],[11],[12],[27] 6.25% [4],[14],[15],[26]
Interest 7.80% [2],[11],[12],[27] 9.30% [4],[14],[15],[26]
Investment, Identifier [Axis]: Finexvet, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 4,613  
Fair value at ending balance $ 4,848 [2],[11],[12],[27] $ 4,613 [4],[14],[15],[26]
Interest 6.50% [2],[11],[12],[27] 6.50% [4],[14],[15],[26]
Interest 9.10% [2],[11],[12],[27] 10.20% [4],[14],[15],[26]
Investment, Identifier [Axis]: FitzMark Buyer, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 4,128  
Fair value at ending balance $ 4,119 [11],[12],[23] $ 4,128 [14],[15],[22]
Interest 4.75% [11],[12],[23] 4.75% [14],[15],[22]
Interest 9.20% [11],[12],[23] 9.40% [14],[15],[22]
Investment, Identifier [Axis]: Five Star Holding LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 564  
Fair value at ending balance $ 564 [8],[12] $ 564 [9],[15]
Investment owned, balance (in shares) 966.99 [8],[12] 966.99 [9],[15]
Investment, Identifier [Axis]: Five Star Holding LLC, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 13,198  
Fair value at ending balance $ 13,268 [10],[11],[12] $ 13,198 [13],[14],[15]
Interest 7.25% [10],[11],[12] 7.25% [13],[14],[15]
Interest 11.60% [10],[11],[12] 11.80% [13],[14],[15]
Investment, Identifier [Axis]: Flexential Issuer, LLC, Structured Secured Note - Class C    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 15,339  
Fair value at ending balance $ 15,862 $ 15,339
Interest 6.90% 6.90%
Investment, Identifier [Axis]: Flywheel Re Segregated Portfolio 2022-4, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 3,875  
Fair value at ending balance $ 4,497 [2],[8],[12] $ 3,875 [4],[9],[15]
Investment owned, balance (in shares) 2,828,286 [2],[8],[12] 2,828,286 [4],[9],[15]
Investment, Identifier [Axis]: Footco 40 Limited, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 217  
Fair value at ending balance $ 226 [2],[11],[12],[20] $ 217 [4],[14],[15],[19]
Interest 6.50% [2],[11],[12],[20] 6.50% [4],[14],[15],[19]
Interest 9.20% [2],[11],[12],[20] 10.20% [4],[14],[15],[19]
Investment, Identifier [Axis]: Footco 40 Limited, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[28] $ 1,588  
Fair value at ending balance $ 1,639 [2],[11],[12],[18],[29] $ 1,588 [4],[5],[14],[15],[28]
Interest 6.50% [2],[11],[12],[18],[29] 6.50% [4],[5],[14],[15],[28]
Interest 10.90% [2],[11],[12],[18],[29] 11.50% [4],[5],[14],[15],[28]
Investment, Identifier [Axis]: Forest Buyer, LLC, Class A LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 130  
Fair value at ending balance $ 132 [12] $ 130 [9],[15]
Investment owned, balance (in shares) 122 [12] 122 [9],[15]
Investment, Identifier [Axis]: Forest Buyer, LLC, Class B LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 124  
Fair value at ending balance $ 136 [8],[12] $ 124 [9],[15]
Investment owned, balance (in shares) 122 [8],[12] 122 [9],[15]
Investment, Identifier [Axis]: Forest Buyer, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 6,091  
Fair value at ending balance $ 6,107 [10],[11],[12] $ 6,091 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.00% [13],[14],[15]
Interest 9.30% [10],[11],[12] 9.60% [13],[14],[15]
Investment, Identifier [Axis]: Forest Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (2)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (2) [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 8,815  
Fair value at ending balance [5],[13],[14],[15]   $ 8,815
Interest [5],[13],[14],[15]   5.25%
Interest [5],[13],[14],[15]   10.00%
Investment, Identifier [Axis]: Fortis Payment Systems, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] (9)  
Fair value at ending balance [5],[13],[14],[15]   $ (9)
Interest [5],[13],[14],[15]   5.25%
Interest [5],[13],[14],[15]   10.00%
Investment, Identifier [Axis]: FragilePak LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] 4,544  
Fair value at ending balance $ 4,532 [10],[11],[12] $ 4,544 [13],[14],[15]
Interest 5.75% [10],[11],[12] 5.75% [13],[14],[15]
Interest 10.20% [10],[11],[12] 10.50% [13],[14],[15]
Investment, Identifier [Axis]: FragilePak LLC, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 767  
Fair value at ending balance $ 680 [8],[12] $ 767 [9],[15]
Investment owned, balance (in shares) 937.5 [8],[12] 937.5 [9],[15]
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 9,129  
Fair value at ending balance $ 9,148 [10],[11],[12],[18] $ 9,129 [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 6.25% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 10.90% [5],[13],[14],[15]
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 1,350  
Fair value at ending balance $ 1,419 [12] $ 1,350 [15]
Investment owned, balance (in shares) 687 [12] 687 [15]
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (23)  
Fair value at ending balance $ 276 [10],[11],[12],[18] $ (23) [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 6.25% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 10.90% [5],[13],[14],[15]
Investment, Identifier [Axis]: GCDL LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 243  
Fair value at ending balance $ 314 [8],[12] $ 243 [9],[15]
Investment owned, balance (in shares) 243,243.24 [8],[12] 243,243.24 [9],[15]
Investment, Identifier [Axis]: GCDL LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 529  
Fair value at ending balance $ 529 [10],[11],[12],[18] $ 529 [5],[13],[14],[15]
Interest 6.00% [10],[11],[12],[18] 6.00% [5],[13],[14],[15]
Interest 10.30% [10],[11],[12],[18] 10.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: GCDL LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (2)  
Fair value at ending balance $ (2) [10],[11],[12],[18] $ (2) [5],[13],[14],[15]
Interest 6.00% [10],[11],[12],[18] 6.00% [5],[13],[14],[15]
Interest 10.30% [10],[11],[12],[18] 10.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: GPNZ II GmbH, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 0  
Fair value at ending balance $ 0 [2],[8],[12] $ 0 [4],[9],[15]
Investment owned, balance (in shares) 5,785 [2],[8],[12] 5,785 [4],[9],[15]
Investment, Identifier [Axis]: GPNZ II GmbH, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 271  
Fair value at ending balance $ 294 [2],[12] $ 271 [4],[15]
Investment, interest rate, paid in kind 10.00% [2],[12] 10.00% [4],[15]
Investment, Identifier [Axis]: GPNZ II GmbH, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15] $ 33  
Fair value at ending balance $ 86 [2],[12] $ 33 [4],[5],[14],[15]
Investment, interest rate, paid in kind 10.00% [2],[12] 10.00% [4],[5],[14],[15]
Investment, Identifier [Axis]: GPNZ II GmbH, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[34],[37] $ 189  
Fair value at ending balance $ 0 [2],[12],[18] $ 189 [4],[14],[15],[34],[37]
Interest [4],[14],[15],[34],[37]   6.00%
Interest [4],[14],[15],[34],[37]   8.70%
Investment, interest rate, paid in kind [2],[12],[18] 10.00%  
Investment, Identifier [Axis]: GPNZ II GmbH, First Lien Senior Secured Term Loan 4    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[35],[38] $ 24  
Interest [2],[11],[12],[35],[38] 6.00%  
Investment, interest rate, paid in kind [2],[11],[12],[35],[38] 9.90%  
Investment, Identifier [Axis]: Global Academic Group Limited, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[32] $ 2,284  
Fair value at ending balance $ 2,520 [2],[11],[12],[33] $ 2,284 [4],[14],[15],[32]
Interest 4.91% [2],[11],[12],[33] 5.50% [4],[14],[15],[32]
Interest 9.20% [2],[11],[12],[33] 9.30% [4],[14],[15],[32]
Investment, Identifier [Axis]: Global Academic Group Limited, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[61] $ 4,000  
Fair value at ending balance $ 4,043 [2],[11],[12],[18],[62] $ 4,000 [4],[5],[14],[15],[61]
Interest 4.91% [2],[11],[12],[18],[62] 5.50% [4],[5],[14],[15],[61]
Interest 8.90% [2],[11],[12],[18],[62] 9.30% [4],[5],[14],[15],[61]
Investment, Identifier [Axis]: Gojo Industries, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 12,883  
Fair value at ending balance $ 12,902 [11],[12],[23] $ 12,883 [13],[14],[15]
Interest 9.50% [11],[12],[23] 9.50% [13],[14],[15]
Interest 13.80% [11],[12],[23] 9.80% [13],[14],[15]
Investment, interest rate, paid in kind [13],[14],[15]   4.50%
Investment, Identifier [Axis]: Graphpad Software, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 9,499  
Fair value at ending balance $ 9,487 [10],[11],[12],[18] $ 9,499 [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: Graphpad Software, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (1)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (1) [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: Greenhill II BV, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 936  
Fair value at ending balance $ 1,006 [2],[11],[12],[20] $ 936 [4],[5],[14],[15],[19]
Interest 5.35% [2],[11],[12],[20] 5.10% [4],[5],[14],[15],[19]
Interest 8.10% [2],[11],[12],[20] 8.30% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Groupe Guemas, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 4,747  
Fair value at ending balance $ 4,964 [2],[11],[12],[27] $ 4,747 [4],[14],[15],[26]
Interest 6.25% [2],[11],[12],[27] 6.25% [4],[14],[15],[26]
Interest 8.80% [2],[11],[12],[27] 9.40% [4],[14],[15],[26]
Investment, Identifier [Axis]: Groupe Product Life, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 871  
Fair value at ending balance [4],[5],[14],[15],[19]   $ 871
Interest [4],[5],[14],[15],[19]   5.45%
Interest [4],[5],[14],[15],[19]   8.50%
Investment, Identifier [Axis]: Groupe Product Life, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[20] $ 802  
Interest [2],[11],[12],[20] 5.70%  
Interest [2],[11],[12],[20] 8.10%  
Investment, Identifier [Axis]: Groupe Product Life, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[18],[20] $ 166  
Interest [2],[11],[12],[18],[20] 5.95%  
Interest [2],[11],[12],[18],[20] 8.40%  
Investment, Identifier [Axis]: HEKA Invest, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 4,850  
Fair value at ending balance $ 5,060 [2],[11],[12],[18],[20] $ 4,850 [4],[5],[14],[15],[19]
Interest 6.25% [2],[11],[12],[18],[20] 6.25% [4],[5],[14],[15],[19]
Interest 8.60% [2],[11],[12],[18],[20] 9.60% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: HS Advisory Buyer LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ 1,257  
Interest [10],[11],[12],[18] 4.75%  
Interest [10],[11],[12],[18] 9.00%  
Investment, Identifier [Axis]: HS Advisory Buyer LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ (9)  
Interest [10],[11],[12],[18] 4.75%  
Interest [10],[11],[12],[18] 9.00%  
Investment, Identifier [Axis]: HSL Compliance, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[18],[29] $ 3,692  
Interest [2],[11],[12],[18],[29] 5.25%  
Interest [2],[11],[12],[18],[29] 9.70%  
Investment, Identifier [Axis]: HTI Technology & Industries, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 10,421  
Fair value at ending balance $ 10,237 [11],[12],[18],[25] $ 10,421 [5],[13],[14],[15]
Interest 8.50% [11],[12],[18],[25] 8.50% [5],[13],[14],[15]
Interest 13.00% [11],[12],[18],[25] 13.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: HTI Technology & Industries, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (70)  
Fair value at ending balance $ (89) [11],[12],[18],[25] $ (70) [5],[13],[14],[15]
Interest 8.50% [11],[12],[18],[25] 8.50% [5],[13],[14],[15]
Interest 13.00% [11],[12],[18],[25] 13.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: HW Holdco, LLC (Hanley Wood LLC), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 11,081  
Fair value at ending balance $ 10,831 [10],[11],[12] $ 11,081 [13],[14],[15]
Interest 5.75% [10],[11],[12] 5.75% [13],[14],[15]
Interest 10.20% [10],[11],[12] 10.60% [13],[14],[15]
Investment, Identifier [Axis]: Haystack Holdings LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ 9,764  
Interest [10],[11],[12],[18] 4.75%  
Interest [10],[11],[12],[18] 9.00%  
Investment, Identifier [Axis]: Haystack Holdings LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ (14)  
Interest [10],[11],[12],[18] 4.75%  
Interest [10],[11],[12],[18] 9.00%  
Investment, Identifier [Axis]: HeartHealth Bidco Pty Ltd, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[32] $ 602  
Fair value at ending balance $ 601 [2],[11],[12],[18],[33] $ 602 [4],[14],[15],[32]
Interest 5.25% [2],[11],[12],[18],[33] 5.25% [4],[14],[15],[32]
Interest 9.40% [2],[11],[12],[18],[33] 9.70% [4],[14],[15],[32]
Investment, Identifier [Axis]: Heartland Veterinary Partners, LLC, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 12,865  
Fair value at ending balance $ 13,306 [12] $ 12,865 [15]
Investment, interest rate, paid in kind 11.00% [12] 11.00% [15]
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 7,221  
Fair value at ending balance $ 7,202 [10],[11],[12] $ 7,221 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.80% [10],[11],[12] 10.10% [13],[14],[15]
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ 0 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 10.10% [5],[13],[14],[15]
Investment, Identifier [Axis]: Heilbron (f/k/a Sucsez (Bolt Bidco B.V.)), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 3,042  
Fair value at ending balance $ 3,272 [2],[11],[12],[35] $ 3,042 [4],[14],[15],[26]
Interest 5.75% [2],[11],[12],[35] 5.75% [4],[14],[15],[26]
Interest 8.10% [2],[11],[12],[35] 9.30% [4],[14],[15],[26]
Investment, Identifier [Axis]: HemaSource, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 124  
Fair value at ending balance $ 128 [8],[12] $ 124 [9],[15]
Investment owned, balance (in shares) 101,080 [8],[12] 101,080 [9],[15]
Investment, Identifier [Axis]: HemaSource, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 7,267  
Fair value at ending balance $ 6,861 [11],[12],[23] $ 7,267 [14],[15],[22]
Interest 4.75% [11],[12],[23] 4.75% [14],[15],[22]
Interest 9.10% [11],[12],[23] 9.30% [14],[15],[22]
Investment, Identifier [Axis]: HemaSource, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[23] $ 0 [5],[14],[15],[22]
Interest 4.75% [11],[12],[18],[23] 4.75% [5],[14],[15],[22]
Interest 9.10% [11],[12],[18],[23] 9.30% [5],[14],[15],[22]
Investment, Identifier [Axis]: Herbalife Ltd., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[22] $ 3,294  
Fair value at ending balance $ 3,292 [2],[11],[23] $ 3,294 [4],[14],[22]
Interest 6.75% [2],[11],[23] 6.75% [4],[14],[22]
Interest 11.10% [2],[11],[23] 12.10% [4],[14],[22]
Investment, Identifier [Axis]: Home Care Assistance, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 3,524  
Fair value at ending balance $ 3,272 [11],[12],[25] $ 3,524 [13],[14],[15]
Interest 5.00% [11],[12],[25] 5.00% [13],[14],[15]
Interest 9.50% [11],[12],[25] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: HomeX Services Group LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 1,477  
Fair value at ending balance $ 1,494 [10],[11],[12],[18] $ 1,477 [5],[13],[14],[15]
Interest 4.50% [10],[11],[12],[18] 4.50% [5],[13],[14],[15]
Interest 8.80% [10],[11],[12],[18] 9.10% [5],[13],[14],[15]
Investment, Identifier [Axis]: HomeX Services Group LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (3)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (3) [5],[13],[14],[15]
Interest 4.50% [10],[11],[12],[18] 4.50% [5],[13],[14],[15]
Interest 8.80% [10],[11],[12],[18] 9.10% [5],[13],[14],[15]
Investment, Identifier [Axis]: Honour Lane Logistics Holdings Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[24] $ 6,645  
Fair value at ending balance $ 6,667 [2],[11],[12],[25] $ 6,645 [4],[14],[15],[24]
Interest 4.75% [2],[11],[12],[25] 5.00% [4],[14],[15],[24]
Interest 9.10% [2],[11],[12],[25] 10.30% [4],[14],[15],[24]
Investment, Identifier [Axis]: Hydratech Holdings, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 7,413  
Fair value at ending balance $ 8,971 [10],[11],[12],[18] $ 7,413 [5],[13],[14],[15]
Interest 5.25% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.60% [10],[11],[12],[18] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: Hydratech Holdings, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 265  
Fair value at ending balance $ 829 [10],[11],[12],[18] $ 265 [5],[13],[14],[15]
Interest 5.25% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.60% [10],[11],[12],[18] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: Hygie 31 Holding, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,502  
Fair value at ending balance $ 1,570 [2],[11],[12],[27] $ 1,502 [4],[14],[15],[26]
Interest 5.88% [2],[11],[12],[27] 5.63% [4],[14],[15],[26]
Interest 8.20% [2],[11],[12],[27] 8.80% [4],[14],[15],[26]
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 [53] $ 0 $ 2,013
Gross Additions [53],[56]   0
Gross Reductions [53],[58]   (1,040)
Amount of Realized Gain (Loss) [53]   (4,179)
Amount of Unrealized Gain (Loss) [53]   3,206
Fair value at ending balance [53]   0
Amount of Interest or Dividends Credited to Income [53],[60]   $ 0
Investment owned, balance (in shares) [53]   102,144
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [53] 0 $ 3,917
Gross Additions [53],[56]   172
Gross Reductions [53],[58]   (3,917)
Amount of Realized Gain (Loss) [53]   0
Amount of Unrealized Gain (Loss) [53]   (172)
Fair value at ending balance [53]   0
Amount of Interest or Dividends Credited to Income [53],[60]   $ 311
Interest [53]   8.00%
Interest [53]   13.40%
Investment, Identifier [Axis]: Hylan Datacom & Electrical LLC, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [53] 0 $ 4,519
Gross Additions [53],[56]   161
Gross Reductions [53],[58]   (4,680)
Amount of Realized Gain (Loss) [53]   0
Amount of Unrealized Gain (Loss) [53]   0
Fair value at ending balance [53]   0
Amount of Interest or Dividends Credited to Income [53],[60]   $ 181
Interest [53]   3.00%
Interest [53]   8.50%
Investment, Identifier [Axis]: ICREDITWORKS LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12] $ 10,208  
Investment owned, balance (in shares) [12] 59,462.7  
Interest [12] 10.00%  
Investment, Identifier [Axis]: ICREDITWORKS LLC, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[12] $ 0  
Investment owned, balance (in shares) [8],[12] 23,692.2  
Investment, Identifier [Axis]: IM Square, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 2,533  
Fair value at ending balance $ 2,648 [2],[11],[12],[20] $ 2,533 [4],[14],[15],[19]
Interest 5.50% [2],[11],[12],[20] 5.50% [4],[14],[15],[19]
Interest 7.80% [2],[11],[12],[20] 8.80% [4],[14],[15],[19]
Investment, Identifier [Axis]: ISTO Technologies II, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 6,706  
Fair value at ending balance $ 6,718 [10],[11],[12] $ 6,706 [14],[15],[24]
Interest 4.75% [10],[11],[12] 5.00% [14],[15],[24]
Interest 9.00% [10],[11],[12] 9.60% [14],[15],[24]
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ (2)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (2) [5],[14],[15],[24]
Interest 4.75% [10],[11],[12],[18] 5.00% [5],[14],[15],[24]
Interest 9.00% [10],[11],[12],[18] 9.60% [5],[14],[15],[24]
Investment, Identifier [Axis]: ITI Intermodal, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 915  
Fair value at ending balance $ 979 [8],[12] $ 915 [9],[15]
Investment owned, balance (in shares) 7,500.4 [8],[12] 7,500.4 [9],[15]
Investment, Identifier [Axis]: ITI Intermodal, Inc., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 800  
Fair value at ending balance $ 799 [10],[11],[12] $ 800 [14],[15],[24]
Interest 6.00% [10],[11],[12] 6.25% [14],[15],[24]
Interest 10.40% [10],[11],[12] 10.60% [14],[15],[24]
Investment, Identifier [Axis]: ITI Intermodal, Inc., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 12,079  
Fair value at ending balance $ 12,047 [10],[11],[12] $ 12,079 [14],[15],[24]
Interest 6.25% [10],[11],[12] 6.50% [14],[15],[24]
Interest 10.60% [10],[11],[12] 10.80% [14],[15],[24]
Investment, Identifier [Axis]: ITI Intermodal, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ 225  
Fair value at ending balance $ 226 [10],[11],[12],[18] $ 225 [5],[14],[15],[24]
Interest 6.00% [10],[11],[12],[18] 6.50% [5],[14],[15],[24]
Interest 10.40% [10],[11],[12],[18] 10.80% [5],[14],[15],[24]
Investment, Identifier [Axis]: Ice House America, L.L.C., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 4,482  
Fair value at ending balance $ 4,493 [10],[11],[12],[18] $ 4,482 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 10.10% [5],[13],[14],[15]
Investment, Identifier [Axis]: Ice House America, L.L.C., LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 316  
Fair value at ending balance $ 281 [8],[12] $ 316 [9],[15]
Investment owned, balance (in shares) 2,893 [8],[12] 2,833 [9],[15]
Investment, Identifier [Axis]: Ice House America, L.L.C., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 186  
Fair value at ending balance $ 313 [10],[11],[12],[18] $ 186 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 10.10% [5],[13],[14],[15]
Investment, Identifier [Axis]: Infoniqa Holdings GmbH, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 2,721  
Fair value at ending balance $ 2,839 [2],[11],[12],[20] $ 2,721 [4],[14],[15],[26]
Interest 4.75% [2],[11],[12],[20] 4.75% [4],[14],[15],[26]
Interest 7.20% [2],[11],[12],[20] 8.10% [4],[14],[15],[26]
Investment, Identifier [Axis]: Innovad Group II BV, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 6,383  
Fair value at ending balance $ 6,658 [2],[11],[12],[20] $ 6,383 [4],[14],[15],[26]
Interest 5.00% [2],[11],[12],[20] 5.00% [4],[14],[15],[26]
Interest 7.40% [2],[11],[12],[20] 8.70% [4],[14],[15],[26]
Investment, Identifier [Axis]: Innovad Group II BV, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[63] $ 1,012  
Fair value at ending balance $ 1,036 [2],[11],[12],[64] $ 1,012 [4],[14],[15],[63]
Interest 5.00% [2],[11],[12],[64] 5.00% [4],[14],[15],[63]
Interest 5.20% [2],[11],[12],[64] 6.00% [4],[14],[15],[63]
Investment, Identifier [Axis]: Innovative XCessories & Services, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14] $ 2,746  
Fair value at ending balance [7],[13],[14]   $ 2,746
Interest [7],[13],[14]   4.25%
Interest [7],[13],[14]   9.00%
Investment, Identifier [Axis]: Interstellar Group B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] 1,509  
Fair value at ending balance $ 1,603 [2],[11],[12],[18],[20] $ 1,509 [4],[5],[14],[15],[19]
Interest 6.00% [2],[11],[12],[18],[20] 6.00% [4],[5],[14],[15],[19]
Interest 8.40% [2],[11],[12],[18],[20] 9.60% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: InvoCare Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[32] $ 1,963  
Fair value at ending balance $ 1,980 [2],[11],[12],[18],[33] $ 1,963 [4],[5],[14],[15],[32]
Interest 6.25% [2],[11],[12],[18],[33] 6.25% [4],[5],[14],[15],[32]
Interest 10.70% [2],[11],[12],[18],[33] 10.70% [4],[5],[14],[15],[32]
Investment, Identifier [Axis]: Isagenix International, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 0  
Fair value at ending balance $ 0 [6],[8],[12] $ 0 [7],[9],[15]
Investment owned, balance (in shares) 58,538 [6],[8],[12] 58,538 [7],[9],[15]
Investment, Identifier [Axis]: Isagenix International, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14],[15] $ 160  
Fair value at ending balance $ 181 [6],[10],[11],[12] $ 160 [7],[13],[14],[15]
Interest 6.60% [6],[10],[11],[12] 6.50% [7],[13],[14],[15]
Interest 10.90% [6],[10],[11],[12] 11.20% [7],[13],[14],[15]
Investment, Identifier [Axis]: Isolstar Holding NV (IPCOM), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 5,075  
Fair value at ending balance $ 5,359 [2],[11],[12],[20] $ 5,075 [4],[14],[15],[19]
Interest 6.00% [2],[11],[12],[20] 6.00% [4],[14],[15],[19]
Interest 8.80% [2],[11],[12],[20] 9.20% [4],[14],[15],[19]
Investment, Identifier [Axis]: Ivanti Software, Inc., Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14] $ 3,285  
Fair value at ending balance $ 2,850 [6],[10],[11] $ 3,285 [7],[13],[14]
Interest 7.25% [6],[10],[11] 7.25% [7],[13],[14]
Interest 11.80% [6],[10],[11] 12.10% [7],[13],[14]
Investment, Identifier [Axis]: JF Acquisition, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 3,736  
Fair value at ending balance $ 3,730 [10],[11],[12] $ 3,736 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.90% [10],[11],[12] 10.20% [13],[14],[15]
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,112  
Fair value at ending balance $ 1,162 [2],[11],[12],[27] $ 1,112 [4],[14],[15],[26]
Interest 5.25% [2],[11],[12],[27] 5.25% [4],[14],[15],[26]
Interest 7.90% [2],[11],[12],[27] 7.90% [4],[14],[15],[26]
Investment, Identifier [Axis]: Jade Bidco Limited (Jane's), First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[24] $ 6,579  
Fair value at ending balance $ 6,526 [2],[11],[12],[25] $ 6,579 [4],[14],[15],[24]
Interest 5.25% [2],[11],[12],[25] 5.25% [4],[14],[15],[24]
Interest 9.80% [2],[11],[12],[25] 9.80% [4],[14],[15],[24]
Investment, Identifier [Axis]: JetBlue 2019-1 Class B Pass Through Trust, Structured Secured Note - Class B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 2,520  
Fair value at ending balance $ 2,489 $ 2,520
Interest 8.00% 8.00%
Investment, Identifier [Axis]: Jocassee Partners LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4],[5] $ 40,761  
Fair value at ending balance [3],[4],[5]   $ 40,761
Investment, Identifier [Axis]: Jocassee Partners LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 40,761 41,053
Gross Additions 0 [54] 0 [56]
Gross Reductions 0 [57] 0 [58]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (936) (292)
Fair value at ending balance 39,825 [1],[2] 40,761
Amount of Interest or Dividends Credited to Income 1,427 [59] 5,709 [60]
Investment, Identifier [Axis]: Jon Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[61] 3,720  
Fair value at ending balance $ 3,760 [2],[11],[12],[18],[62] $ 3,720 [4],[5],[14],[15],[61]
Interest 4.50% [2],[11],[12],[18],[62] 4.50% [4],[5],[14],[15],[61]
Interest 8.70% [2],[11],[12],[18],[62] 9.50% [4],[5],[14],[15],[61]
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 3,481  
Fair value at ending balance $ 3,481 [11],[12],[25] $ 3,481 [13],[14],[15]
Interest 5.50% [11],[12],[25] 5.50% [13],[14],[15]
Interest 9.80% [11],[12],[25] 10.00% [13],[14],[15]
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 372  
Fair value at ending balance $ 421 [12] $ 372 [15]
Investment owned, balance (in shares) 1,018 [12] 1,018 [15]
Investment, Identifier [Axis]: Jones Fish Hatcheries & Distributors LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 251 [11],[12],[18],[25] $ 0 [5],[13],[14],[15]
Interest 5.50% [11],[12],[18],[25] 5.50% [5],[13],[14],[15]
Interest 9.80% [11],[12],[18],[25] 10.00% [5],[13],[14],[15]
Investment, Identifier [Axis]: Keystone Bidco B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 677  
Fair value at ending balance $ 847 [2],[11],[12],[18],[27] $ 677 [4],[5],[14],[15],[19]
Interest 5.25% [2],[11],[12],[18],[27] 5.25% [4],[5],[14],[15],[19]
Interest 7.80% [2],[11],[12],[18],[27] 8.10% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Keystone Bidco B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 18  
Fair value at ending balance $ 19 [2],[11],[12],[18],[27] $ 18 [4],[5],[14],[15],[19]
Interest 5.25% [2],[11],[12],[18],[27] 5.25% [4],[5],[14],[15],[19]
Interest 7.80% [2],[11],[12],[18],[27] 8.10% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 13,156  
Fair value at ending balance $ 13,122 [10],[11],[12] $ 13,156 [13],[14],[15]
Interest 4.75% [10],[11],[12] 4.75% [13],[14],[15]
Interest 9.20% [10],[11],[12] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: Kid Distro Holdings, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 772  
Fair value at ending balance $ 784 [8],[12] $ 772 [9],[15]
Investment owned, balance (in shares) 637,677.11 [8],[12] 637,677.11 [9],[15]
Investment, Identifier [Axis]: Lambir Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[26] $ 1,952  
Fair value at ending balance $ 2,013 [2],[11],[12],[18],[27] $ 1,952 [4],[5],[14],[15],[26]
Interest 6.00% [2],[11],[12],[18],[27] 6.00% [4],[5],[14],[15],[26]
Interest 8.60% [2],[11],[12],[18],[27] 8.70% [4],[5],[14],[15],[26]
Investment, Identifier [Axis]: Lambir Bidco Limited, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 1,721  
Fair value at ending balance $ 1,765 [2],[12] $ 1,721 [4],[15]
Investment, interest rate, paid in kind 12.00% [2],[12] 12.00% [4],[15]
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[24] $ 687  
Fair value at ending balance $ 734 [2],[11],[12],[18],[25] $ 687 [4],[5],[14],[15],[24]
Interest 5.50% [2],[11],[12],[18],[25] 5.75% [4],[5],[14],[15],[24]
Interest 10.30% [2],[11],[12],[18],[25] 10.60% [4],[5],[14],[15],[24]
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[24] $ (1)  
Fair value at ending balance $ 0 [2],[11],[12],[18],[25] $ (1) [4],[5],[14],[15],[24]
Interest 5.50% [2],[11],[12],[18],[25] 5.75% [4],[5],[14],[15],[24]
Interest 10.30% [2],[11],[12],[18],[25] 10.60% [4],[5],[14],[15],[24]
Investment, Identifier [Axis]: LeadsOnline, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 10,029  
Fair value at ending balance $ 10,033 [10],[11],[12] $ 10,029 [13],[14],[15]
Interest 4.75% [10],[11],[12] 4.75% [13],[14],[15]
Interest 9.00% [10],[11],[12] 9.40% [13],[14],[15]
Investment, Identifier [Axis]: LeadsOnline, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 180  
Fair value at ending balance $ 210 [12] $ 180 [15]
Investment owned, balance (in shares) 81,739 [12] 81,739 [15]
Investment, Identifier [Axis]: LeadsOnline, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (10)  
Fair value at ending balance $ (3) [10],[11],[12],[18] $ (10) [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: Learfield Communications, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 4,085  
Fair value at ending balance $ 4,195 [8] $ 4,085 [9],[15]
Investment owned, balance (in shares) 55,198 [8] 55,198 [9],[15]
Investment, Identifier [Axis]: Learfield Communications, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[22] $ 5,520  
Fair value at ending balance $ 5,460 [11],[23] $ 5,520 [14],[22]
Interest 4.50% [11],[23] 5.00% [14],[22]
Interest 8.80% [11],[23] 9.60% [14],[22]
Investment, Identifier [Axis]: Legal Solutions Holdings, Senior Subordinated Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15],[37],[65] $ 0  
Fair value at ending balance [15],[37],[65]   $ 0
Investment, interest rate, paid in kind [15],[37],[65]   6.00%
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[12] $ 0  
Investment owned, balance (in shares) [8],[12] 16,173  
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14],[15] $ 2,812  
Fair value at ending balance $ 2,796 [6],[10],[11],[12] $ 2,812 [7],[13],[14],[15]
Interest 7.00% [6],[10],[11],[12] 7.00% [7],[13],[14],[15]
Interest 11.60% [6],[10],[11],[12] 11.90% [7],[13],[14],[15]
Investment, Identifier [Axis]: Long Term Care Group, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 7,839  
Fair value at ending balance $ 8,169 [10],[11],[12] $ 7,839 [13],[14],[15]
Interest 6.00% [10],[11],[12] 3.27% [13],[14],[15]
Interest 6.90% [10],[11],[12] 8.10% [13],[14],[15]
Investment, interest rate, paid in kind 3.70% [10],[11],[12] 3.70% [13],[14],[15]
Investment, Identifier [Axis]: M-Personal Protection Management GMBH (f.k.a INOS 19-090 GmbH), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 10,829  
Fair value at ending balance [4],[14],[15],[19]   $ 10,829
Interest [4],[14],[15],[19]   5.38%
Interest [4],[14],[15],[19]   8.10%
Investment, Identifier [Axis]: M-Personal Protection Management GMBH, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[20] $ 11,436  
Interest [2],[11],[12],[20] 5.38%  
Interest [2],[11],[12],[20] 8.10%  
Investment, Identifier [Axis]: MB Purchaser, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 2,591  
Fair value at ending balance $ 2,591 [10],[11],[12],[18] $ 2,591 [5],[14],[15],[22]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[14],[15],[22]
Interest 9.10% [10],[11],[12],[18] 9.40% [5],[14],[15],[22]
Investment, Identifier [Axis]: MB Purchaser, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 82  
Fair value at ending balance $ 78 [8],[12] $ 82 [9],[15]
Investment owned, balance (in shares) 66 [8],[12] 66 [9],[15]
Investment, Identifier [Axis]: MB Purchaser, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ (2)  
Fair value at ending balance $ (2) [10],[11],[12],[18] $ (2) [5],[14],[15],[22]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[14],[15],[22]
Interest 9.10% [10],[11],[12],[18] 9.40% [5],[14],[15],[22]
Investment, Identifier [Axis]: MC Group Ventures Corporation, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 4,899  
Fair value at ending balance $ 4,926 [10],[11],[12],[18] $ 4,899 [5],[14],[15],[22]
Interest 5.25% [10],[11],[12],[18] 5.25% [5],[14],[15],[22]
Interest 9.60% [10],[11],[12],[18] 9.90% [5],[14],[15],[22]
Investment, Identifier [Axis]: MC Group Ventures Corporation, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ 4,036  
Fair value at ending balance $ 4,043 [10],[11],[12],[18] $ 4,036 [5],[14],[15],[24]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[14],[15],[24]
Interest 9.90% [10],[11],[12],[18] 10.20% [5],[14],[15],[24]
Investment, Identifier [Axis]: MC Group Ventures Corporation, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 681  
Fair value at ending balance $ 681 [8],[12] $ 681 [9],[15]
Investment owned, balance (in shares) 746.66 [8],[12] 746.66 [9],[15]
Investment, Identifier [Axis]: MI OpCo Holdings, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[22] $ 6,320  
Fair value at ending balance [14],[22]   $ 6,320
Interest [14],[22]   7.25%
Interest [14],[22]   11.80%
Investment, Identifier [Axis]: MNS Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] 662  
Fair value at ending balance $ 660 [11],[12],[23] $ 662 [13],[14],[15]
Interest 5.00% [11],[12],[23] 5.00% [13],[14],[15]
Interest 9.40% [11],[12],[23] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: MNS Buyer, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 106  
Fair value at ending balance $ 108 [8],[12] $ 106 [9],[15]
Investment owned, balance (in shares) 76,923 [8],[12] 76,923 [9],[15]
Investment, Identifier [Axis]: MSI Express Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ 5,470  
Interest [10],[11],[12],[18] 4.75%  
Interest [10],[11],[12],[18] 9.10%  
Investment, Identifier [Axis]: MSI Express Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ 624  
Interest [10],[11],[12],[18] 4.75%  
Interest [10],[11],[12],[18] 9.10%  
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 [42] $ 0 $ 9,762
Gross Additions [42],[44]   720
Gross Reductions [42],[46]   (9,620)
Amount of Realized Gain (Loss) [42]   (862)
Amount of Unrealized Gain (Loss) [42]   0
Fair value at ending balance [42]   0
Amount of Interest or Dividends Credited to Income [42],[48]   $ 495
Interest [42]   4.50%
Investment, interest rate, paid in kind [42]   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 [4],[9],[15],[65] 13,741  
Fair value at ending balance [4],[9],[15],[65]   $ 13,741
Investment owned, balance (in shares) [4],[9],[15],[65]   18,000
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 13,741 [41] $ 15,430 [42]
Gross Additions 0 [41],[43] 9,620 [42],[44]
Gross Reductions 0 [41],[45] 0 [42],[46]
Amount of Realized Gain (Loss) 0 [41] 0 [42]
Amount of Unrealized Gain (Loss) 203 [41] (11,309) [42]
Fair value at ending balance [41] 13,944 13,741
Amount of Interest or Dividends Credited to Income $ 0 [41],[47] $ 0 [42],[48]
Investment owned, balance (in shares) 18,000 [41] 18,000 [42]
Investment, Identifier [Axis]: MVC Automotive Group Gmbh, Common Equity Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[8],[12],[66] $ 13,944  
Investment owned, balance (in shares) [2],[8],[12],[66] 18,000  
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 $ 0 [4],[9],[65] $ 24
Gross Additions 0 [43] 0 [44]
Gross Reductions 0 [45] (17) [46]
Amount of Realized Gain (Loss) (183) 0
Amount of Unrealized Gain (Loss) 183 (7)
Fair value at ending balance 0 0 [4],[9],[65]
Amount of Interest or Dividends Credited to Income $ 0 [47] $ 48 [48]
Investment owned, balance (in shares) 1,831.4 1,831.4 [4],[9],[65]
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 $ 11 [4],[9],[65] $ 981
Gross Additions 0 [43] 0 [44]
Gross Reductions (116) [45] (678) [46]
Amount of Realized Gain (Loss) (7,166) 0
Amount of Unrealized Gain (Loss) 7,271 (292)
Fair value at ending balance 0 11 [4],[9],[65]
Amount of Interest or Dividends Credited to Income $ 0 [47] $ 0 [48]
Investment owned, balance (in shares) 71,790.4 71,790.4
Investment, Identifier [Axis]: Magnetite XIX, Limited, Subordinated Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[7],[13],[15] $ 10,500  
Fair value at ending balance $ 5,238 [2],[10],[11] $ 10,500 [4],[7],[13],[15]
Interest 8.00% [2],[10],[11] 9.03% [4],[7],[13],[15]
Interest 12.30% [2],[10],[11] 13.70% [4],[7],[13],[15]
Investment, Identifier [Axis]: Marmoutier Holding B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[26],[37] $ 146  
Fair value at ending balance $ (24) [2],[11],[12],[18],[27],[38] $ 146 [4],[5],[14],[15],[26],[37]
Interest 6.50% [2],[11],[12],[18],[27],[38] 6.50% [4],[5],[14],[15],[26],[37]
Interest [4],[5],[14],[15],[26],[37]   10.40%
Investment, interest rate, paid in kind [2],[11],[12],[18],[27],[38] 10.40%  
Investment, Identifier [Axis]: Marmoutier Holding B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[26],[37] $ (53)  
Fair value at ending balance $ (13) [2],[11],[12],[18],[27],[38] $ (53) [4],[5],[14],[15],[26],[37]
Interest 5.75% [2],[11],[12],[18],[27],[38] 5.75% [4],[5],[14],[15],[26],[37]
Interest [4],[5],[14],[15],[26],[37]   6.70%
Investment, interest rate, paid in kind [2],[11],[12],[18],[27],[38] 6.70%  
Investment, Identifier [Axis]: Marmoutier Holding B.V., Super Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[37] $ 185  
Fair value at ending balance $ 193 [2],[12],[38] $ 185 [4],[14],[15],[37]
Investment, interest rate, paid in kind 6.00% [2],[12],[38] 6.00% [4],[14],[15],[37]
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 1,747  
Fair value at ending balance $ 1,749 [10],[11],[12] $ 1,747 [13],[14],[15]
Interest 4.50% [10],[11],[12] 4.75% [13],[14],[15]
Interest 8.80% [10],[11],[12] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[49] $ 3,775  
Fair value at ending balance $ 3,607 [11],[12],[50] $ 3,775 [14],[15],[49]
Interest 4.50% [11],[12],[50] 4.75% [14],[15],[49]
Interest 9.00% [11],[12],[50] 9.60% [14],[15],[49]
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Revolver 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (9)  
Fair value at ending balance $ 33 [10],[11],[12],[18] $ (9) [5],[13],[14],[15]
Interest 4.50% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 8.80% [10],[11],[12],[18] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Media Recovery, Inc. (SpotSee), Revolver 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[49] $ (10)  
Fair value at ending balance $ (10) [11],[12],[18],[50] $ (10) [5],[14],[15],[49]
Interest 4.50% [11],[12],[18],[50] 4.75% [5],[14],[15],[49]
Interest 9.00% [11],[12],[18],[50] 9.60% [5],[14],[15],[49]
Investment, Identifier [Axis]: Median B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[30] $ 8,966  
Fair value at ending balance $ 9,305 [2],[11],[29] $ 8,966 [4],[14],[30]
Interest 5.93% [2],[11],[29] 5.93% [4],[14],[30]
Interest 10.50% [2],[11],[29] 11.00% [4],[14],[30]
Investment, Identifier [Axis]: Medical Solutions Parent Holdings, Inc., Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14] $ 2,211  
Fair value at ending balance $ 2,211 [10],[11] $ 2,211 [13],[14]
Interest 7.00% [10],[11] 7.00% [13],[14]
Interest 11.40% [10],[11] 11.70% [13],[14]
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 205 [8],[12] 205 [9],[15]
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 3,648  
Fair value at ending balance $ 3,901 [10],[11],[12] $ 3,648 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.25% [13],[14],[15]
Interest 9.80% [10],[11],[12] 9.70% [13],[14],[15]
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 46  
Fair value at ending balance $ 92 [8],[12] $ 46 [9],[15]
Investment owned, balance (in shares) 1,842 [8],[12] 1,842 [9],[15]
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 108  
Fair value at ending balance $ 150 [10],[11],[12],[18] $ 108 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.25% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 9.70% [5],[13],[14],[15]
Investment, Identifier [Axis]: Mercell Holding AS, Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 125  
Fair value at ending balance $ 138 [2],[8],[12] $ 125 [4],[9],[15]
Investment owned, balance (in shares) 114.4 [2],[8],[12] 114.4 [4],[9],[15]
Investment, interest rate, paid in kind [4],[9],[15]   9.00%
Investment, Identifier [Axis]: Mercell Holding AS, Class B Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 21  
Fair value at ending balance $ 26 [2],[8],[12] $ 21 [4],[9],[15]
Investment owned, balance (in shares) 28,943.8 [2],[8],[12] 28,943.8 [4],[9],[15]
Investment, Identifier [Axis]: Mercell Holding AS, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[67] $ 2,750  
Fair value at ending balance $ 2,972 [2],[11],[12],[18],[68] $ 2,750 [4],[5],[14],[15],[67]
Interest 5.50% [2],[11],[12],[18],[68] 5.50% [4],[5],[14],[15],[67]
Interest 10.00% [2],[11],[12],[18],[68] 10.10% [4],[5],[14],[15],[67]
Investment, Identifier [Axis]: Modern Star Holdings Bidco Pty Limited., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[69] $ 7,008  
Fair value at ending balance $ 6,933 [2],[11],[12],[18],[70] $ 7,008 [4],[5],[14],[15],[69]
Interest 6.00% [2],[11],[12],[18],[70] 6.00% [4],[5],[14],[15],[69]
Interest 10.10% [2],[11],[12],[18],[70] 10.40% [4],[5],[14],[15],[69]
Investment, Identifier [Axis]: Momentum Textiles, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[23] $ 7,255  
Interest [11],[12],[23] 5.50%  
Interest [11],[12],[23] 9.80%  
Investment, Identifier [Axis]: Momentum Textiles, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[18],[23] $ (9)  
Interest [11],[12],[18],[23] 5.50%  
Interest [11],[12],[18],[23] 9.80%  
Investment, Identifier [Axis]: Moonlight Bidco Limited, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 182  
Fair value at ending balance $ 198 [2],[8],[12] $ 182 [4],[9],[15]
Investment owned, balance (in shares) 10,590 [2],[8],[12] 10,590 [4],[9],[15]
Investment, Identifier [Axis]: Moonlight Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[28] $ 1,841  
Fair value at ending balance $ 1,917 [2],[11],[12],[18],[29] $ 1,841 [4],[5],[14],[15],[28]
Interest 5.00% [2],[11],[12],[18],[29] 5.75% [4],[5],[14],[15],[28]
Interest 9.50% [2],[11],[12],[18],[29] 10.70% [4],[5],[14],[15],[28]
Investment, Identifier [Axis]: Murphy Midco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 1,641  
Fair value at ending balance $ 1,638 [2],[11],[12],[31] $ 1,641 [4],[14],[15],[30]
Interest 5.25% [2],[11],[12],[31] 5.25% [4],[14],[15],[30]
Interest 10.20% [2],[11],[12],[31] 10.20% [4],[14],[15],[30]
Investment, Identifier [Axis]: Music Reports, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 6,618  
Fair value at ending balance $ 6,604 [10],[11],[12] $ 6,618 [13],[14],[15]
Interest 6.25% [10],[11],[12] 6.25% [13],[14],[15]
Interest 10.70% [10],[11],[12] 10.70% [13],[14],[15]
Investment, Identifier [Axis]: NAW Buyer LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 11,850  
Fair value at ending balance $ 11,820 [10],[11],[12],[18] $ 11,850 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.75% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 10.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: NAW Buyer LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 524  
Fair value at ending balance $ 543 [12] $ 524 [15]
Investment owned, balance (in shares) 472,512 [12] 472,512 [15]
Investment, Identifier [Axis]: NAW Buyer LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ 0 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.75% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 10.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: NF Holdco, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 6,283  
Fair value at ending balance $ 6,267 [10],[11],[12] $ 6,283 [13],[14],[15]
Interest 6.50% [10],[11],[12] 6.50% [13],[14],[15]
Interest 10.80% [10],[11],[12] 10.80% [13],[14],[15]
Investment, Identifier [Axis]: NF Holdco, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 563  
Fair value at ending balance $ 448 [8],[12] $ 563 [9],[15]
Investment owned, balance (in shares) 639,510 [8],[12] 639,510 [9],[15]
Investment, Identifier [Axis]: NF Holdco, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 276  
Fair value at ending balance $ 276 [10],[11],[12],[18] $ 276 [5],[13],[14],[15]
Interest 6.50% [10],[11],[12],[18] 6.50% [5],[13],[14],[15]
Interest 10.80% [10],[11],[12],[18] 10.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: NPM Investments 28 B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 1,869  
Fair value at ending balance $ 1,967 [2],[11],[12],[18],[20] $ 1,869 [4],[5],[14],[15],[19]
Interest 6.00% [2],[11],[12],[18],[20] 6.00% [4],[5],[14],[15],[19]
Interest 8.40% [2],[11],[12],[18],[20] 9.30% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Napa Bidco Pty Ltd, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[32] $ 12,459  
Fair value at ending balance $ 12,540 [2],[11],[12],[33] $ 12,459 [4],[14],[15],[32]
Interest 5.00% [2],[11],[12],[33] 5.00% [4],[14],[15],[32]
Interest 9.20% [2],[11],[12],[33] 9.50% [4],[14],[15],[32]
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Class A Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 578  
Fair value at ending balance $ 589 [8],[12] $ 578 [9],[15]
Investment owned, balance (in shares) 4,587.38 [8],[12] 4,587.38 [9],[15]
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Class B Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 743  
Fair value at ending balance $ 677 [8],[12] $ 743 [9],[15]
Investment owned, balance (in shares) 509.71 [8],[12] 509.71 [9],[15]
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 5,074  
Fair value at ending balance $ 5,061 [11],[12],[23] $ 5,074 [14],[15],[22]
Interest 4.75% [11],[12],[23] 4.75% [14],[15],[22]
Interest 9.20% [11],[12],[23] 9.40% [14],[15],[22]
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[23] $ 0 [5],[14],[15],[22]
Interest 4.75% [11],[12],[18],[23] 4.75% [5],[14],[15],[22]
Interest 9.20% [11],[12],[18],[23] 9.40% [5],[14],[15],[22]
Investment, Identifier [Axis]: Navia Benefit Solutions, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 5,572  
Fair value at ending balance $ 5,557 [11],[12],[23] $ 5,572 [14],[15],[22]
Interest 4.50% [11],[12],[23] 4.50% [14],[15],[22]
Interest 8.90% [11],[12],[23] 9.20% [14],[15],[22]
Investment, Identifier [Axis]: NeoxCo, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 2,456  
Fair value at ending balance $ 2,583 [2],[11],[12],[27] $ 2,456 [4],[14],[15],[26]
Interest 6.35% [2],[11],[12],[27] 6.50% [4],[14],[15],[26]
Interest 8.90% [2],[11],[12],[27] 10.10% [4],[14],[15],[26]
Investment, Identifier [Axis]: Next Holdco, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 7,320  
Fair value at ending balance $ 22,077 [10],[11],[12],[18] $ 7,320 [5],[13],[14],[15]
Interest 5.25% [10],[11],[12],[18] 5.75% [5],[13],[14],[15]
Interest 9.60% [10],[11],[12],[18] 10.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Next Holdco, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ (7) [10],[11],[12],[18] $ 0 [5],[13],[14],[15]
Interest 5.25% [10],[11],[12],[18] 5.75% [5],[13],[14],[15]
Interest 9.60% [10],[11],[12],[18] 10.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Northstar Recycling, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 16,910  
Fair value at ending balance $ 17,136 [10],[11],[12],[18] $ 16,910 [5],[13],[14],[15]
Interest 4.65% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.00% [5],[13],[14],[15]
Investment, Identifier [Axis]: Northstar Recycling, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (44)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (44) [5],[13],[14],[15]
Interest 4.65% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.00% [5],[13],[14],[15]
Investment, Identifier [Axis]: OA Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 8,268  
Fair value at ending balance [14],[15],[22]   $ 8,268
Interest [14],[15],[22]   4.75%
Interest [14],[15],[22]   9.30%
Investment, Identifier [Axis]: OA Buyer, Inc., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[23] $ 5,461  
Interest [11],[12],[23] 4.50%  
Interest [11],[12],[23] 8.80%  
Investment, Identifier [Axis]: OA Buyer, Inc., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[23] $ 2,819  
Interest [11],[12],[23] 4.50%  
Interest [11],[12],[23] 8.80%  
Investment, Identifier [Axis]: OA Buyer, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 783  
Fair value at ending balance $ 827 [8],[12] $ 783 [15]
Investment owned, balance (in shares) 210,920.11 [8],[12] 210,920.11 [15]
Investment, Identifier [Axis]: OA Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ (5)  
Fair value at ending balance $ 0 [11],[12],[18],[23] $ (5) [5],[14],[15],[22]
Interest 4.50% [11],[12],[18],[23] 4.75% [5],[14],[15],[22]
Interest 8.80% [11],[12],[18],[23] 9.30% [5],[14],[15],[22]
Investment, Identifier [Axis]: OAC Holdings I Corp, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 3,539  
Fair value at ending balance $ 3,312 [10],[11],[12] $ 3,539 [14],[15],[22]
Interest 5.00% [10],[11],[12] 5.00% [14],[15],[22]
Interest 9.50% [10],[11],[12] 9.70% [14],[15],[22]
Investment, Identifier [Axis]: OAC Holdings I Corp, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 0  
Fair value at ending balance $ 489 [10],[11],[12],[18] $ 0 [5],[14],[15],[22]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[14],[15],[22]
Interest 9.50% [10],[11],[12],[18] 9.70% [5],[14],[15],[22]
Investment, Identifier [Axis]: OG III B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 3,241  
Fair value at ending balance [4],[14],[15],[19]   $ 3,241
Interest [4],[14],[15],[19]   5.50%
Interest [4],[14],[15],[19]   8.90%
Investment, Identifier [Axis]: OG III B.V., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[20] $ 2,098  
Interest [2],[11],[12],[20] 5.40%  
Interest [2],[11],[12],[20] 7.80%  
Investment, Identifier [Axis]: OG III B.V., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[20] $ 1,291  
Interest [2],[11],[12],[20] 5.50%  
Interest [2],[11],[12],[20] 7.90%  
Investment, Identifier [Axis]: ORTEC INTERNATIONAL NEWCO B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 931  
Fair value at ending balance $ 973 [2],[11],[12],[20] $ 931 [4],[14],[15],[19]
Interest 5.50% [2],[11],[12],[20] 5.75% [4],[14],[15],[19]
Interest 7.90% [2],[11],[12],[20] 8.50% [4],[14],[15],[19]
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 13,901  
Fair value at ending balance $ 13,896 [10],[11],[12],[18] $ 13,901 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.25% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 151  
Fair value at ending balance $ 195 [12] $ 151 [15]
Investment owned, balance (in shares) 173,749 [12] 173,749 [15]
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 430  
Fair value at ending balance $ 432 [10],[11],[12],[18] $ 430 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.25% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: Ocelot Holdco LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 742  
Fair value at ending balance $ 903 [8],[12] $ 742 [9],[15]
Investment owned, balance (in shares) 186.67 [8],[12] 186.67 [9],[15]
Investment, Identifier [Axis]: Ocelot Holdco LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 2,873  
Fair value at ending balance $ 2,963 [12] $ 2,873 [15]
Investment owned, balance (in shares) 243.81 [12] 243.81 [15]
Investment, interest rate, paid in kind 15.00% [12] 15.00% [15]
Investment, Identifier [Axis]: Ocelot Holdco LLC, Super Senior Takeback Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15] $ 549  
Fair value at ending balance $ 549 [11],[12] $ 549 [14],[15]
Interest 10.00% [11],[12] 10.00% [14],[15]
Investment, Identifier [Axis]: Ocelot Holdco LLC, Takeback Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15] $ 2,933  
Fair value at ending balance [14],[15]   $ 2,933
Interest [14],[15]   10.00%
Investment, Identifier [Axis]: Ocelot Holdco LLC, Takeback Term loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12] $ 2,933  
Interest [11],[12] 10.00%  
Investment, Identifier [Axis]: Ocular Therapeutix, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[22] $ 4,849  
Fair value at ending balance $ 4,849 [2],[11],[12],[23] $ 4,849 [4],[14],[15],[22]
Interest 6.75% [2],[11],[12],[23] 6.75% [4],[14],[15],[22]
Interest 11.10% [2],[11],[12],[23] 11.20% [4],[14],[15],[22]
Investment, Identifier [Axis]: Offen Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[15],[22] $ 3,681  
Fair value at ending balance $ 3,678 [6],[12],[23] $ 3,681 [7],[15],[22]
Interest 5.11% [6],[12],[23] 5.00% [7],[15],[22]
Interest 9.40% [6],[12],[23] 9.70% [7],[15],[22]
Investment, Identifier [Axis]: Oracle Vision Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 2,802  
Fair value at ending balance $ 2,898 [2],[11],[12],[31] $ 2,802 [4],[14],[15],[30]
Interest 5.00% [2],[11],[12],[31] 5.25% [4],[14],[15],[30]
Interest 9.70% [2],[11],[12],[31] 10.00% [4],[14],[15],[30]
Investment, Identifier [Axis]: Origin Bidco Limited, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 301  
Fair value at ending balance $ 314 [2],[11],[12],[20] $ 301 [4],[14],[15],[19]
Interest 5.25% [2],[11],[12],[20] 5.25% [4],[14],[15],[19]
Interest 7.80% [2],[11],[12],[20] 8.10% [4],[14],[15],[19]
Investment, Identifier [Axis]: Origin Bidco Limited, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 522  
Fair value at ending balance $ 524 [2],[10],[11],[12] $ 522 [4],[13],[14],[15]
Interest 5.25% [2],[10],[11],[12] 5.25% [4],[13],[14],[15]
Interest 9.80% [2],[10],[11],[12] 10.00% [4],[13],[14],[15]
Investment, Identifier [Axis]: PDQ.Com Corporation, Class A-2 Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 42  
Fair value at ending balance $ 26 [8],[12] $ 42 [9],[15]
Investment owned, balance (in shares) 13.9 [8],[12] 28.8 [9],[15]
Investment, Identifier [Axis]: PDQ.Com Corporation, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 14,514  
Fair value at ending balance $ 14,752 [10],[11],[12],[18] $ 14,514 [5],[13],[14],[15]
Interest 4.50% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 8.80% [10],[11],[12],[18] 9.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 844  
Fair value at ending balance $ 883 [2],[11],[12],[18],[20] $ 844 [4],[5],[14],[15],[19]
Interest 5.75% [2],[11],[12],[18],[20] 5.75% [4],[5],[14],[15],[19]
Interest 8.30% [2],[11],[12],[18],[20] 8.80% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: PSP Intermediate 4, LLC, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 1,408  
Fair value at ending balance $ 1,411 [2],[10],[11],[12] $ 1,408 [4],[13],[14],[15]
Interest 5.75% [2],[10],[11],[12] 5.75% [4],[13],[14],[15]
Interest 10.30% [2],[10],[11],[12] 10.50% [4],[13],[14],[15]
Investment, Identifier [Axis]: Panoche Energy Center LLC, First Lien Senior Secured Bond    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 3,695  
Fair value at ending balance $ 3,351 [12] $ 3,695 [15]
Interest 6.90% [12] 6.90% [15]
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 2,688  
Fair value at ending balance $ 2,667 [2],[11],[12],[20] $ 2,688 [4],[14],[15],[26]
Interest 5.25% [2],[11],[12],[20] 5.25% [4],[14],[15],[26]
Interest 7.60% [2],[11],[12],[20] 9.00% [4],[14],[15],[26]
Investment, interest rate, paid in kind [4],[14],[15],[26]   0.80%
Investment, Identifier [Axis]: Pare SAS (SAS Maurice MARLE), First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 1,500  
Fair value at ending balance $ 1,500 [2],[10],[11],[12] $ 1,500 [4],[13],[14],[15]
Interest 5.25% [2],[10],[11],[12] 5.25% [4],[13],[14],[15]
Interest 9.60% [2],[10],[11],[12] 9.90% [4],[13],[14],[15]
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 609  
Fair value at ending balance [5],[14],[15],[22]   $ 609
Interest [5],[14],[15],[22]   8.30%
Interest [5],[14],[15],[22]   12.90%
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[18],[23] $ 25  
Interest [11],[12],[18],[23] 8.25%  
Interest [11],[12],[18],[23] 12.60%  
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [11],[12],[23] $ 588  
Interest [11],[12],[23] 8.30%  
Interest [11],[12],[23] 12.70%  
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 263  
Fair value at ending balance $ 213 [8],[12] $ 263 [9],[15]
Investment owned, balance (in shares) 29,762 [8],[12] 29,762 [9],[15]
Investment, Identifier [Axis]: Parkview Dental Holdings LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12] $ 37  
Investment owned, balance (in shares) [12] 1,229.1  
Investment, interest rate, paid in kind [12] 10.00%  
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 2,045  
Fair value at ending balance $ 1,945 [2],[11],[12],[20] $ 2,045 [4],[14],[15],[19]
Interest 5.75% [2],[11],[12],[20] 6.75% [4],[14],[15],[19]
Interest 8.30% [2],[11],[12],[20] 9.80% [4],[14],[15],[19]
Investment, Identifier [Axis]: Patriot New Midco 1 Limited (Forensic Risk Alliance), First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 2,628  
Fair value at ending balance $ 2,397 [2],[10],[11],[12] $ 2,628 [4],[13],[14],[15]
Interest 5.75% [2],[10],[11],[12] 7.01% [4],[13],[14],[15]
Interest 10.40% [2],[10],[11],[12] 11.60% [4],[13],[14],[15]
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Structured Secured Note - Class A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 177  
Fair value at ending balance $ 179 [2],[12] $ 177 [4],[15]
Interest 4.70% [2],[12] 4.70% [4],[15]
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Structured Secured Note - Class B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 178  
Fair value at ending balance $ 180 [2],[12] $ 178 [4],[15]
Interest 5.40% [2],[12] 5.40% [4],[15]
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Structured Secured Note - Class C    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 180  
Fair value at ending balance $ 180 [2],[12] $ 180 [4],[15]
Interest 5.90% [2],[12] 5.90% [4],[15]
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Structured Secured Note - Class D    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 178  
Fair value at ending balance $ 181 [2],[12] $ 178 [4],[15]
Interest 8.50% [2],[12] 8.50% [4],[15]
Investment, Identifier [Axis]: Perimeter Master Note Business Trust, Structured Secured Note - Class E    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 8,904  
Fair value at ending balance $ 9,263 [2],[12] $ 8,904 [4],[15]
Interest 11.40% [2],[12] 11.40% [4],[15]
Investment, Identifier [Axis]: Permaconn BidCo Pty Ltd, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[32] $ 2,537  
Fair value at ending balance $ 2,553 [2],[11],[12],[33] $ 2,537 [4],[14],[15],[32]
Interest 5.25% [2],[11],[12],[33] 5.25% [4],[14],[15],[32]
Interest 9.40% [2],[11],[12],[33] 9.70% [4],[14],[15],[32]
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 957  
Fair value at ending balance $ 954 [11],[12],[23] $ 957 [13],[14],[15]
Interest 4.75% [11],[12],[23] 4.75% [13],[14],[15]
Interest 9.20% [11],[12],[23] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 1,229  
Fair value at ending balance $ 1,492 [12] $ 1,229 [15]
Investment owned, balance (in shares) 7,409 [12] 7,409 [15]
Investment, Identifier [Axis]: Polara Enterprises, L.L.C., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[23] $ 0 [5],[13],[14],[15]
Interest 4.75% [11],[12],[18],[23] 4.75% [5],[13],[14],[15]
Interest 9.20% [11],[12],[18],[23] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Policy Services Company, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 52,940  
Fair value at ending balance $ 51,038 [10],[11],[12] $ 52,940 [13],[14],[15]
Interest 6.00% [10],[11],[12] 6.00% [13],[14],[15]
Interest 10.60% [10],[11],[12] 10.90% [13],[14],[15]
Investment, interest rate, paid in kind 4.00% [10],[11],[12] 4.00% [13],[14],[15]
Investment, Identifier [Axis]: Policy Services Company, LLC, Warrants - Class A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 1,262  
Fair value at ending balance $ 1,202 [8],[12] $ 1,262 [9],[15]
Investment owned, balance (in shares) 2.5582 [8],[12] 2.5582 [9],[15]
Investment, Identifier [Axis]: Policy Services Company, LLC, Warrants - Class B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 426  
Fair value at ending balance $ 406 [8],[12] $ 426 [9],[15]
Investment owned, balance (in shares) 0.8634 [8],[12] 0.8634 [9],[15]
Investment, Identifier [Axis]: Policy Services Company, LLC, Warrants - Class CC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 0.0888 [8],[12] 0.0888 [9],[15]
Investment, Identifier [Axis]: Policy Services Company, LLC, Warrants - Class D    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 122  
Fair value at ending balance $ 116 [8],[12] $ 122 [9],[15]
Investment owned, balance (in shares) 0.2471 [8],[12] 0.2471 [9],[15]
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 0  
Fair value at ending balance $ 0 [8],[12] $ 0 [9],[15]
Investment owned, balance (in shares) 74 [8],[12] 74 [9],[15]
Investment, Identifier [Axis]: Polymer Solutions Group Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[14],[15],[22],[37] $ 554  
Fair value at ending balance $ 460 [6],[11],[12],[23],[38] $ 554 [7],[14],[15],[22],[37]
Interest 7.00% [6],[11],[12],[23],[38] 7.00% [7],[14],[15],[22],[37]
Interest [7],[14],[15],[22],[37]   11.30%
Investment, interest rate, paid in kind [6],[11],[12],[23],[38] 11.60%  
Investment, Identifier [Axis]: PowerGEM Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 6,710  
Fair value at ending balance $ 8,010 [10],[11],[12],[18] $ 6,710 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: PowerGEM Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (26)  
Fair value at ending balance $ (22) [10],[11],[12],[18] $ (26) [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 7,377  
Fair value at ending balance $ 7,387 [10],[11],[12] $ 7,377 [13],[14],[15]
Interest 6.25% [10],[11],[12] 6.25% [13],[14],[15]
Interest 10.70% [10],[11],[12] 10.70% [13],[14],[15]
Investment, Identifier [Axis]: Premium Franchise Brands, LLC, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 2,694  
Fair value at ending balance $ 2,725 [10],[11],[12] $ 2,694 [13],[14],[15]
Interest 6.75% [10],[11],[12] 6.75% [13],[14],[15]
Interest 11.20% [10],[11],[12] 11.20% [13],[14],[15]
Investment, Identifier [Axis]: Premium Invest, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 8,750  
Fair value at ending balance $ 9,041 [2],[11],[12],[18],[20] $ 8,750 [4],[5],[14],[15],[19]
Interest 5.75% [2],[11],[12],[18],[20] 5.75% [4],[5],[14],[15],[19]
Interest 8.10% [2],[11],[12],[18],[20] 9.10% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Preqin MC Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[24] $ 2,789  
Fair value at ending balance [4],[14],[15],[24]   $ 2,789
Interest [4],[14],[15],[24]   5.00%
Interest [4],[14],[15],[24]   10.20%
Investment, Identifier [Axis]: Pro-Vision Solutions Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] 7,662  
Fair value at ending balance $ 7,671 [11],[12],[23] $ 7,662 [13],[14],[15]
Interest 4.50% [11],[12],[23] 4.50% [13],[14],[15]
Interest 8.80% [11],[12],[23] 8.80% [13],[14],[15]
Investment, Identifier [Axis]: Pro-Vision Solutions Holdings, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 249  
Fair value at ending balance $ 233 [8],[12] $ 249 [9],[15]
Investment owned, balance (in shares) 2,357.5 [8],[12] 2,357.5 [9],[15]
Investment, Identifier [Axis]: Pro-Vision Solutions Holdings, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (28)  
Fair value at ending balance $ 327 [11],[12],[18],[23] $ (28) [5],[13],[14],[15]
Interest 4.50% [11],[12],[18],[23] 4.50% [5],[13],[14],[15]
Interest 8.80% [11],[12],[18],[23] 8.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: Process Equipment, Inc. (ProcessBarron), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 5,338  
Fair value at ending balance $ 5,178 [11],[12],[25] $ 5,338 [14],[15],[24]
Interest 5.25% [11],[12],[25] 5.25% [14],[15],[24]
Interest 9.70% [11],[12],[25] 9.80% [14],[15],[24]
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 237  
Fair value at ending balance $ 198 [8],[12] $ 237 [9],[15]
Investment owned, balance (in shares) 281 [8],[12] 281 [9],[15]
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 5,134  
Fair value at ending balance $ 5,595 [10],[11],[12],[18] $ 5,134 [5],[13],[14],[15]
Interest 6.25% [10],[11],[12],[18] 6.25% [5],[13],[14],[15]
Interest 10.60% [10],[11],[12],[18] 10.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 889  
Fair value at ending balance $ 509 [10],[11],[12],[18] $ 889 [5],[13],[14],[15]
Interest 6.25% [10],[11],[12],[18] 6.25% [5],[13],[14],[15]
Interest 10.60% [10],[11],[12],[18] 10.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: ProfitOptics, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 1,613  
Fair value at ending balance $ 1,608 [11],[12],[23] $ 1,613 [14],[15],[22]
Interest 5.75% [11],[12],[23] 5.75% [14],[15],[22]
Interest 10.20% [11],[12],[23] 10.20% [14],[15],[22]
Investment, Identifier [Axis]: ProfitOptics, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 198  
Fair value at ending balance $ 317 [8],[12] $ 198 [9],[15]
Investment owned, balance (in shares) 241,935.48 [8],[12] 241,935.48 [9],[15]
Investment, Identifier [Axis]: ProfitOptics, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 242  
Fair value at ending balance $ 242 [11],[12],[18],[23] $ 242 [5],[14],[15],[22]
Interest 5.75% [11],[12],[18],[23] 5.75% [5],[14],[15],[22]
Interest 10.20% [11],[12],[18],[23] 10.20% [5],[14],[15],[22]
Investment, Identifier [Axis]: ProfitOptics, LLC, Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 76  
Fair value at ending balance $ 76 [12] $ 76 [15]
Interest 8.00% [12] 8.00% [15]
Investment, Identifier [Axis]: Proppants Holding, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[15] $ 0  
Fair value at ending balance $ 0 [6],[12] $ 0 [7],[15]
Investment owned, balance (in shares) 1,506,254 [6],[12] 1,506,254 [7],[15]
Investment, Identifier [Axis]: Protego Bidco B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,646  
Fair value at ending balance $ 1,722 [2],[11],[12],[27] $ 1,646 [4],[14],[15],[26]
Interest 6.50% [2],[11],[12],[27] 6.75% [4],[14],[15],[26]
Interest 8.90% [2],[11],[12],[27] 10.00% [4],[14],[15],[26]
Investment, Identifier [Axis]: Protego Bidco B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,974  
Fair value at ending balance $ 2,074 [2],[11],[12],[27] $ 1,974 [4],[14],[15],[26]
Interest 6.50% [2],[11],[12],[27] 6.50% [4],[14],[15],[26]
Interest 8.90% [2],[11],[12],[27] 9.70% [4],[14],[15],[26]
Investment, Identifier [Axis]: QPE7 SPV1 BidCo Pty Ltd, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[69] $ 1,694  
Fair value at ending balance $ 1,705 [2],[11],[12],[70] $ 1,694 [4],[14],[15],[69]
Interest 3.75% [2],[11],[12],[70] 3.75% [4],[14],[15],[69]
Interest 7.80% [2],[11],[12],[70] 8.10% [4],[14],[15],[69]
Investment, Identifier [Axis]: Qualified Industries, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 61  
Fair value at ending balance $ 73 [8],[12] $ 61 [9],[15]
Investment owned, balance (in shares) 303,030 [8],[12] 303,030 [9],[15]
Investment, Identifier [Axis]: Qualified Industries, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 2,567  
Fair value at ending balance $ 2,571 [11],[12],[25] $ 2,567 [14],[15],[24]
Interest 6.50% [11],[12],[25] 5.75% [14],[15],[24]
Interest 10.80% [11],[12],[25] 10.10% [14],[15],[24]
Investment, Identifier [Axis]: Qualified Industries, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 175  
Fair value at ending balance $ 180 [8],[12] $ 175 [9],[15]
Investment owned, balance (in shares) 148 [8],[12] 148 [9],[15]
Investment, interest rate, paid in kind [9],[15]   12.50%
Investment, Identifier [Axis]: Qualified Industries, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ (5)  
Fair value at ending balance $ (4) [11],[12],[18],[25] $ (5) [5],[14],[15],[24]
Interest 6.50% [11],[12],[18],[25] 5.75% [5],[14],[15],[24]
Interest 10.80% [11],[12],[18],[25] 10.10% [5],[14],[15],[24]
Investment, Identifier [Axis]: Questel Unite, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 7,059  
Fair value at ending balance [4],[13],[14],[15]   $ 7,059
Interest [4],[13],[14],[15]   6.25%
Interest [4],[13],[14],[15]   10.80%
Investment, Identifier [Axis]: R1 Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] 6,135  
Fair value at ending balance $ 6,047 [11],[12],[25] $ 6,135 [14],[15],[22]
Interest 6.25% [11],[12],[25] 6.25% [14],[15],[22]
Interest 10.50% [11],[12],[25] 10.80% [14],[15],[22]
Investment, Identifier [Axis]: R1 Holdings, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 472  
Fair value at ending balance $ 801 [11],[12],[18],[25] $ 472 [5],[14],[15],[22]
Interest 6.25% [11],[12],[18],[25] 6.25% [5],[14],[15],[22]
Interest 10.50% [11],[12],[18],[25] 10.80% [5],[14],[15],[22]
Investment, Identifier [Axis]: RA Outdoors, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14],[15] $ 12,732  
Fair value at ending balance $ 13,005 [6],[11],[12],[25] $ 12,732 [7],[13],[14],[15]
Interest 6.75% [6],[11],[12],[25] 6.75% [7],[13],[14],[15]
Interest 11.30% [6],[11],[12],[25] 11.70% [7],[13],[14],[15]
Investment, Identifier [Axis]: RA Outdoors, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14],[15] $ 1,217  
Fair value at ending balance $ 1,244 [6],[11],[12],[25] $ 1,217 [7],[13],[14],[15]
Interest 6.75% [6],[11],[12],[25] 6.75% [7],[13],[14],[15]
Interest 11.30% [6],[11],[12],[25] 11.70% [7],[13],[14],[15]
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 4,595  
Fair value at ending balance $ 3,673 [8],[12] $ 4,595 [9],[15]
Investment owned, balance (in shares) 1,231 [8],[12] 1,231 [9],[15]
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 1,015  
Fair value at ending balance $ 1,013 [10],[11],[12] $ 1,015 [13],[14],[15]
Interest 8.00% [10],[11],[12] 8.00% [13],[14],[15]
Interest 12.30% [10],[11],[12] 12.50% [13],[14],[15]
Investment, Identifier [Axis]: REP SEKO MERGER SUB LLC, First Out Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 2,577  
Fair value at ending balance $ 2,571 [10],[11],[12] $ 2,577 [13],[14],[15]
Interest 8.00% [10],[11],[12] 8.00% [13],[14],[15]
Interest 12.30% [10],[11],[12] 12.50% [13],[14],[15]
Investment, Identifier [Axis]: ROI Solutions LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 17,973  
Fair value at ending balance $ 17,991 [11],[12],[18],[25] $ 17,973 [5],[13],[14],[15]
Interest 5.00% [11],[12],[18],[25] 5.00% [5],[13],[14],[15]
Interest 9.30% [11],[12],[18],[25] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: ROI Solutions LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (55)  
Fair value at ending balance $ (46) [11],[12],[18],[25] $ (55) [5],[13],[14],[15]
Interest 5.00% [11],[12],[18],[25] 5.00% [5],[13],[14],[15]
Interest 9.30% [11],[12],[18],[25] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: RPX Corporation, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 21,638  
Fair value at ending balance $ 21,610 [11],[12],[23] $ 21,638 [13],[14],[15]
Interest 5.25% [11],[12],[23] 5.50% [13],[14],[15]
Interest 9.60% [11],[12],[23] 10.60% [13],[14],[15]
Investment, Identifier [Axis]: RPX Corporation, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (39)  
Fair value at ending balance $ (35) [11],[12],[18],[23] $ (39) [5],[13],[14],[15]
Interest 5.25% [11],[12],[18],[23] 5.50% [5],[13],[14],[15]
Interest 9.60% [11],[12],[18],[23] 10.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Class A Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 0  
Fair value at ending balance $ 0 [6],[8],[12] $ 0 [7],[9],[15]
Investment owned, balance (in shares) 145.347 [6],[8],[12] 145.347 [7],[9],[15]
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Class B Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 0  
Fair value at ending balance $ 0 [6],[8],[12] $ 0 [7],[9],[15]
Investment owned, balance (in shares) 145.347 [6],[8],[12] 145.347 [7],[9],[15]
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Class C Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 57  
Fair value at ending balance $ 52 [6],[8],[12] $ 57 [7],[9],[15]
Investment owned, balance (in shares) 7,844.03 [6],[8],[12] 7,844.03 [7],[9],[15]
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 0  
Fair value at ending balance $ 0 [6],[8],[12] $ 0 [7],[9],[15]
Investment owned, balance (in shares) 153 [6],[8],[12] 153 [7],[9],[15]
Investment, Identifier [Axis]: Randys Holdings, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [8],[12] $ 671  
Investment owned, balance (in shares) [8],[12] 5,333  
Investment, Identifier [Axis]: Randys Holdings, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 10,873  
Fair value at ending balance $ 11,850 [10],[11],[12],[18] $ 10,873 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 6.25% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 11.20% [5],[13],[14],[15]
Investment, Identifier [Axis]: Randys Holdings, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 622  
Fair value at ending balance [9],[15]   $ 622
Investment owned, balance (in shares) [9],[15]   5,333
Investment, Identifier [Axis]: Randys Holdings, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] 613  
Fair value at ending balance $ 809 [10],[11],[12],[18] $ 613 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 6.25% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 11.20% [5],[13],[14],[15]
Investment, Identifier [Axis]: Rapid Buyer LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ 5,313  
Fair value at ending balance $ 5,332 [10],[11],[12],[18] $ 5,313 [5],[14],[15],[24]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[14],[15],[24]
Interest 9.00% [10],[11],[12],[18] 9.40% [5],[14],[15],[24]
Investment, Identifier [Axis]: Rapid Buyer LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 533  
Fair value at ending balance $ 536 [8],[12] $ 533 [9],[15]
Investment owned, balance (in shares) 533 [8],[12] 533 [9],[15]
Investment, Identifier [Axis]: Rapid Buyer LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (22)  
Fair value at ending balance $ (19) [10],[11],[12],[18] $ (22) [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: Recovery Point Systems, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 11,294  
Fair value at ending balance $ 11,265 [10],[11],[12] $ 11,294 [13],[14],[15]
Interest 6.00% [10],[11],[12] 6.00% [13],[14],[15]
Interest 10.40% [10],[11],[12] 10.70% [13],[14],[15]
Investment, Identifier [Axis]: Recovery Point Systems, Inc., Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 81  
Fair value at ending balance $ 82 [8],[12] $ 81 [9],[15]
Investment owned, balance (in shares) 187,235 [8],[12] 187,235 [9],[15]
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 4,308  
Fair value at ending balance $ 4,363 [10],[11],[12] $ 4,308 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.90% [10],[11],[12] 10.10% [13],[14],[15]
Investment, Identifier [Axis]: Renovation Parent Holdings, LLC, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 85  
Fair value at ending balance $ 95 [8],[12] $ 85 [9],[15]
Investment owned, balance (in shares) 202,393.6 [8],[12] 202,393.6 [9],[15]
Investment, Identifier [Axis]: Resolute Investment Managers, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 98  
Fair value at ending balance $ 0 [6],[8],[12] $ 98 [7],[9],[15]
Investment owned, balance (in shares) 38,571 [6],[8],[12] 38,571 [7],[9],[15]
Investment, Identifier [Axis]: Rhondda Financing No. 1 DAC, Structured - Junior Note    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[15] $ 26,044  
Fair value at ending balance [4],[5],[15]   $ 26,044
Investment, Identifier [Axis]: Riedel Beheer B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] 1,963  
Fair value at ending balance $ 1,942 [2],[11],[12],[20] $ 1,963 [4],[14],[15],[19]
Interest 6.25% [2],[11],[12],[20] 6.25% [4],[14],[15],[19]
Interest 8.60% [2],[11],[12],[20] 9.60% [4],[14],[15],[19]
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 [53] $ 243 [9],[15] $ 844
Gross Additions 0 [54],[55] 0 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) 247 [55] (601) [53]
Fair value at ending balance 490 [8],[12],[55] 243 [9],[15],[53]
Amount of Interest or Dividends Credited to Income $ 0 [55],[59] $ 0 [53],[60]
Investment owned, balance (in shares) 23.8 [8],[12],[55] 23.8 [9],[15],[53]
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 $ 83,000 [5],[13],[15],[55] $ 73,113 [53]
Gross Additions 2,114 [54],[55] 12,098 [53],[56]
Gross Reductions 0 [55],[57] (2,222) [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (13) [55] 11 [53]
Fair value at ending balance [55] 85,101 [10],[12],[18] 83,000 [5],[13],[15]
Amount of Interest or Dividends Credited to Income $ 2,114 [55],[59] $ 8,598 [53],[60]
Interest 6.00% [10],[12],[18],[55] 6.00% [5],[13],[15],[53]
Investment owned, balance (in shares) 71,000 [10],[12],[18],[55] 71,000 [5],[13],[15],[53]
Investment, interest rate, paid in kind 10.40% [10],[12],[18],[55] 10.30% [5],[13],[15],[53]
Investment, Identifier [Axis]: Rock Labor LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 6,426  
Fair value at ending balance $ 6,436 [11],[12],[23] $ 6,426 [13],[14],[15]
Interest 5.50% [11],[12],[23] 5.50% [13],[14],[15]
Interest 9.80% [11],[12],[23] 10.70% [13],[14],[15]
Investment, Identifier [Axis]: Rock Labor LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 1,127  
Fair value at ending balance $ 1,202 [12] $ 1,127 [15]
Investment owned, balance (in shares) 233,871 [12] 233,871 [15]
Investment, Identifier [Axis]: Rock Labor LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (19)  
Fair value at ending balance $ (14) [10],[11],[12],[18] $ (19) [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 10.70% [5],[13],[14],[15]
Investment, Identifier [Axis]: Royal Buyer, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 8,098  
Fair value at ending balance $ 8,084 [10],[11],[12] $ 8,098 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.80% [10],[11],[12] 10.00% [13],[14],[15]
Investment, Identifier [Axis]: Royal Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (2)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (2) [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 10.00% [5],[13],[14],[15]
Investment, Identifier [Axis]: Ruffalo Noel Levitz, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 6,792  
Fair value at ending balance $ 4,405 [10],[11],[12],[38] $ 6,792 [13],[14],[15]
Interest 4.00% [10],[11],[12],[38] 2.25% [13],[14],[15]
Interest [13],[14],[15]   7.00%
Investment, interest rate, paid in kind 10.90% [10],[11],[12],[38] 4.30% [13],[14],[15]
Investment, Identifier [Axis]: Russell Investments US Institutional Holdco, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 508  
Fair value at ending balance $ 512 [10],[11],[12] $ 508 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.00% [13],[14],[15]
Interest 7.80% [10],[11],[12] 8.20% [13],[14],[15]
Investment, interest rate, paid in kind 1.50% [10],[11],[12] 1.50% [13],[14],[15]
Investment, Identifier [Axis]: SBP Holdings LP, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 8,648  
Fair value at ending balance $ 8,640 [11],[12],[18],[23] $ 8,648 [5],[14],[15],[22]
Interest 5.00% [11],[12],[18],[23] 5.00% [5],[14],[15],[22]
Interest 9.30% [11],[12],[18],[23] 9.60% [5],[14],[15],[22]
Investment, Identifier [Axis]: SBP Holdings LP, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (13)  
Fair value at ending balance $ (11) [11],[12],[18],[23] $ (13) [5],[13],[14],[15]
Interest 5.00% [11],[12],[18],[23] 5.00% [5],[13],[14],[15]
Interest 9.30% [11],[12],[18],[23] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: SISU ACQUISITIONCO., INC., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 6,591  
Fair value at ending balance $ 6,657 [10],[11],[12] $ 6,591 [5],[13],[14],[15]
Interest 5.75% [10],[11],[12] 5.75% [5],[13],[14],[15]
Interest 10.20% [10],[11],[12] 10.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: SPATCO Energy Solutions, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 280  
Fair value at ending balance $ 274 [8],[12] $ 280 [9],[15]
Investment owned, balance (in shares) 274,229 [8],[12] 274,229 [9],[15]
Investment, Identifier [Axis]: SPATCO Energy Solutions, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 6,990  
Fair value at ending balance $ 6,973 [10],[11],[12],[18] $ 6,990 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: SPATCO Energy Solutions, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (18)  
Fair value at ending balance $ (18) [10],[11],[12],[18] $ (18) [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: SSCP Pegasus Midco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[28] $ 4,368  
Fair value at ending balance $ 6,286 [2],[11],[12],[18],[29] $ 4,368 [4],[5],[14],[15],[28]
Interest 6.00% [2],[11],[12],[18],[29] 6.00% [4],[5],[14],[15],[28]
Interest 10.60% [2],[11],[12],[18],[29] 10.70% [4],[5],[14],[15],[28]
Investment, Identifier [Axis]: SSCP Spring Bidco 3 Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 941  
Fair value at ending balance $ 972 [2],[11],[12],[31] $ 941 [4],[14],[15],[30]
Interest 6.45% [2],[11],[12],[31] 6.45% [4],[14],[15],[30]
Interest 11.20% [2],[11],[12],[31] 11.20% [4],[14],[15],[30]
Investment, Identifier [Axis]: SVI International LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 583  
Fair value at ending balance $ 588 [10],[11],[12],[18] $ 583 [5],[13],[14],[15]
Interest 6.75% [10],[11],[12],[18] 6.75% [5],[13],[14],[15]
Interest 11.00% [10],[11],[12],[18] 11.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: SVI International LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 277  
Fair value at ending balance $ 283 [12] $ 277 [15]
Investment owned, balance (in shares) 207,921 [12] 207,921 [15]
Investment, Identifier [Axis]: SVI International LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (1)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (1) [5],[13],[14],[15]
Interest 6.75% [10],[11],[12],[18] 6.75% [5],[13],[14],[15]
Interest 11.00% [10],[11],[12],[18] 11.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: Saab Purchaser, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 17,592  
Fair value at ending balance $ 17,622 [10],[11],[12],[18] $ 17,592 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Saab Purchaser, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (24)  
Fair value at ending balance $ (21) [10],[11],[12],[18] $ (24) [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Safety Products Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 14,812  
Fair value at ending balance $ 14,775 [10],[11],[12] $ 14,812 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.00% [13],[14],[15]
Interest 9.30% [10],[11],[12] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: Safety Products Holdings, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 537  
Fair value at ending balance $ 527 [8],[12] $ 537 [9],[15]
Investment owned, balance (in shares) 378.7 [8],[12] 378.7 [9],[15]
Investment, Identifier [Axis]: Sanoptis S.A.R.L., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[26] $ 3,692  
Fair value at ending balance $ 3,866 [2],[11],[12],[18],[27] $ 3,692 [4],[5],[14],[15],[26]
Interest 5.75% [2],[11],[12],[18],[27] 5.75% [4],[5],[14],[15],[26]
Interest 8.80% [2],[11],[12],[18],[27] 8.80% [4],[5],[14],[15],[26]
Investment, Identifier [Axis]: Sanoptis S.A.R.L., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[63] $ 2,788  
Fair value at ending balance $ 2,910 [2],[11],[12],[71] $ 2,788 [4],[14],[15],[63]
Interest 5.75% [2],[11],[12],[71] 5.75% [4],[14],[15],[63]
Interest 6.20% [2],[11],[12],[71] 7.00% [4],[14],[15],[63]
Investment, Identifier [Axis]: Sanoptis S.A.R.L., First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[63] $ 46  
Fair value at ending balance [4],[14],[15],[63]   $ 46
Interest [4],[14],[15],[63]   6.75%
Interest [4],[14],[15],[63]   8.00%
Investment, Identifier [Axis]: Sansidor BV, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] 534  
Fair value at ending balance $ 691 [2],[11],[12],[18],[20] $ 534 [4],[5],[14],[15],[19]
Interest 5.25% [2],[11],[12],[18],[20] 5.25% [4],[5],[14],[15],[19]
Interest 7.60% [2],[11],[12],[18],[20] 8.60% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Scaled Agile, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 1,605  
Fair value at ending balance $ 1,541 [10],[11],[12] $ 1,605 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.90% [10],[11],[12] 10.20% [13],[14],[15]
Investment, Identifier [Axis]: Scaled Agile, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 302  
Fair value at ending balance $ 291 [10],[11],[12] $ 302 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.90% [10],[11],[12] 10.20% [13],[14],[15]
Investment, Identifier [Axis]: Scout Bidco B.V., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 3,297  
Fair value at ending balance $ 3,447 [2],[11],[12],[20] $ 3,297 [4],[14],[15],[19]
Interest 5.75% [2],[11],[12],[20] 5.50% [4],[14],[15],[19]
Interest 8.20% [2],[11],[12],[20] 8.40% [4],[14],[15],[19]
Investment, Identifier [Axis]: Scout Bidco B.V., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 442  
Fair value at ending balance $ 442 [2],[10],[11],[12] $ 442 [4],[13],[14],[15]
Interest 5.75% [2],[10],[11],[12] 5.57% [4],[13],[14],[15]
Interest 10.10% [2],[10],[11],[12] 10.10% [4],[13],[14],[15]
Investment, Identifier [Axis]: Scout Bidco B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ (14)  
Fair value at ending balance $ (12) [2],[11],[12],[18],[20] $ (14) [4],[5],[14],[15],[19]
Interest 5.75% [2],[11],[12],[18],[20] 5.50% [4],[5],[14],[15],[19]
Interest 8.20% [2],[11],[12],[18],[20] 8.40% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Security Holdings B.V, Bridge Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [42] $ 6,655 $ 6,328
Gross Additions 0 [41],[43] 327 [42],[44]
Gross Reductions 0 [41],[45] 0 [42],[46]
Amount of Realized Gain (Loss) 0 [41] 0 [42]
Amount of Unrealized Gain (Loss) 0 [41] 0 [42]
Fair value at ending balance 6,655 [41] 6,655 [42]
Amount of Interest or Dividends Credited to Income $ 83 [41],[47] $ 326 [42],[48]
Investment, interest rate, paid in kind 5.00% [41] 5.00% [42]
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [42] $ 399 $ 311
Gross Additions 0 [41],[43] 0 [42],[44]
Gross Reductions 0 [41],[45] 0 [42],[46]
Amount of Realized Gain (Loss) 0 [41] 0 [42]
Amount of Unrealized Gain (Loss) 50 [41] 88 [42]
Fair value at ending balance 449 [41] 399 [42]
Amount of Interest or Dividends Credited to Income $ 0 [41],[47] $ 0 [42],[48]
Investment owned, balance (in shares) 17,100 [41] 17,100 [42]
Investment, Identifier [Axis]: Security Holdings B.V, Common Stock Series B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [42] $ 37,296 $ 29,080
Gross Additions 0 [41],[43] 0 [42],[44]
Gross Reductions 0 [41],[45] 0 [42],[46]
Amount of Realized Gain (Loss) 0 [41] 0 [42]
Amount of Unrealized Gain (Loss) 4,699 [41] 8,216 [42]
Fair value at ending balance 41,995 [41] 37,296 [42]
Amount of Interest or Dividends Credited to Income $ 0 [41],[47] $ 0 [42],[48]
Investment owned, balance (in shares) 1,236 [41] 1,236 [42]
Investment, Identifier [Axis]: Security Holdings B.V, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [42] $ 5,333 $ 3,866
Gross Additions 165 [41],[43] 1,828 [42],[44]
Gross Reductions (3) [41],[45] (12) [42],[46]
Amount of Realized Gain (Loss) 2 [41] 17 [42]
Amount of Unrealized Gain (Loss) 228 [41] (366) [42]
Fair value at ending balance 5,725 [41] 5,333 [42]
Amount of Interest or Dividends Credited to Income $ 85 [41],[47] $ 188 [42],[48]
Interest [42]   6.00%
Investment, interest rate, paid in kind [41] 6.00%  
Investment, Identifier [Axis]: Security Holdings B.V, Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [42] $ 11,191 $ 10,867
Gross Additions 154 [41],[43] 324 [42],[44]
Gross Reductions 0 [41],[45] 0 [42],[46]
Amount of Realized Gain (Loss) 0 [41] 0 [42]
Amount of Unrealized Gain (Loss) 0 [41] 0 [42]
Fair value at ending balance 11,345 [41] 11,191 [42]
Amount of Interest or Dividends Credited to Income $ 88 [41],[47] $ 273 [42],[48]
Investment, interest rate, paid in kind 3.10% [41] 3.10% [42]
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 [42] $ 2,293 $ 2,236
Gross Additions 107 [41],[43] 208 [42],[44]
Gross Reductions 0 [41],[45] 0 [42],[46]
Amount of Realized Gain (Loss) 0 [41] 0 [42]
Amount of Unrealized Gain (Loss) 100 [41] (151) [42]
Fair value at ending balance 2,500 [41] 2,293 [42]
Amount of Interest or Dividends Credited to Income $ 94 [41],[47] $ 255 [42],[48]
Interest [42]   6.00%
Investment, interest rate, paid in kind 9.00% [41] 9.00% [42]
Investment, Identifier [Axis]: Security Holdings B.V., Bridge Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15],[65] $ 6,655  
Fair value at ending balance $ 6,655 [2],[12],[66] $ 6,655 [4],[15],[65]
Investment, interest rate, paid in kind 5.00% [2],[12],[66] 5.00% [4],[15],[65]
Investment, Identifier [Axis]: Security Holdings B.V., Common Stock Series A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15],[65] $ 399  
Fair value at ending balance $ 449 [2],[8],[12],[66] $ 399 [4],[9],[15],[65]
Investment owned, balance (in shares) 17,100 [2],[8],[12],[66] 17,100 [4],[9],[15],[65]
Investment, Identifier [Axis]: Security Holdings B.V., Common Stock Series B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15],[65] $ 37,296  
Fair value at ending balance $ 41,995 [2],[8],[12],[66] $ 37,296 [4],[9],[15],[65]
Investment owned, balance (in shares) 1,236 [2],[8],[12],[66] 1,236 [4],[9],[15],[65]
Investment, Identifier [Axis]: Security Holdings B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[15],[65] $ 5,333  
Fair value at ending balance $ 5,725 [2],[12],[18],[66] $ 5,333 [4],[5],[15],[65]
Interest [4],[5],[15],[65]   6.00%
Investment, interest rate, paid in kind [2],[12],[18],[66] 6.00%  
Investment, Identifier [Axis]: Security Holdings B.V., Senior Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15],[65] $ 11,191  
Fair value at ending balance $ 11,345 [2],[12],[66] $ 11,191 [4],[15],[65]
Investment, interest rate, paid in kind 3.10% [2],[12],[66] 3.10% [4],[15],[65]
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 [4],[15],[65] $ 2,293  
Fair value at ending balance $ 2,500 [2],[12],[18],[66] $ 2,293 [4],[15],[65]
Interest [4],[15],[65]   6.00%
Investment, interest rate, paid in kind 9.00% [2],[12],[18],[66] 9.00% [4],[15],[65]
Investment, Identifier [Axis]: Selenium Designated Activity Company, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[11],[12],[27] $ 7,574  
Interest [2],[11],[12],[27] 5.13%  
Interest [2],[11],[12],[27] 7.50%  
Investment, Identifier [Axis]: Sereni Capital NV, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 903  
Fair value at ending balance $ 943 [2],[11],[12],[35] $ 903 [4],[14],[15],[26]
Interest 6.00% [2],[11],[12],[35] 6.00% [4],[14],[15],[26]
Interest 8.40% [2],[11],[12],[35] 8.70% [4],[14],[15],[26]
Investment, Identifier [Axis]: Sereni Capital NV, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 1,524  
Fair value at ending balance $ 1,588 [2],[11],[12],[35] $ 1,524 [4],[14],[15],[26]
Interest 6.75% [2],[11],[12],[35] 6.75% [4],[14],[15],[26]
Interest 9.10% [2],[11],[12],[35] 9.70% [4],[14],[15],[26]
Investment, Identifier [Axis]: Serta Simmons Bedding LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9] $ 655  
Fair value at ending balance $ 906 [8] $ 655 [9]
Investment owned, balance (in shares) 109,127 [8] 109,127 [9]
Investment, Identifier [Axis]: Shelf Bidco Ltd, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 4,668  
Fair value at ending balance $ 4,632 [2],[12] $ 4,668 [4],[15]
Investment owned, balance (in shares) 1,200,000 [2],[12] 1,200,000 [4],[15]
Investment, Identifier [Axis]: Shelf Bidco Ltd, Second Out Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 12,153  
Fair value at ending balance $ 12,127 [2],[10],[11],[12] $ 12,153 [4],[13],[14],[15]
Interest 5.00% [2],[10],[11],[12] 5.00% [4],[13],[14],[15]
Interest 9.30% [2],[10],[11],[12] 9.60% [4],[13],[14],[15]
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 [3],[4],[7] $ 41,453  
Fair value at ending balance [3],[4],[7]   $ 41,453
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 41,453 39,172
Gross Additions 0 [54] 0 [56]
Gross Reductions 0 [57] 0 [58]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (905) 2,281
Fair value at ending balance 40,548 [1],[2],[6] 41,453
Amount of Interest or Dividends Credited to Income 1,767 [59] 2,225 [60]
Investment, Identifier [Axis]: Sinari Invest, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[26] 1,858  
Fair value at ending balance $ 1,969 [2],[11],[12],[18],[27] $ 1,858 [4],[5],[14],[15],[26]
Interest 6.00% [2],[11],[12],[18],[27] 6.00% [4],[5],[14],[15],[26]
Interest 9.30% [2],[11],[12],[18],[27] 9.30% [4],[5],[14],[15],[26]
Investment, Identifier [Axis]: Skyvault Holdings LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[15] $ 3,586  
Fair value at ending balance $ 12,139 [12],[18] $ 3,586 [5],[15]
Investment, interest rate, paid in kind 12.00% [12],[18] 12.00% [5],[15]
Investment, Identifier [Axis]: Skyvault Holdings LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 3,586 [55] $ 0 [53]
Gross Additions 8,553 [54],[55] 3,586 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) 0 [55] 0 [53]
Fair value at ending balance [55] 12,139 3,586
Amount of Interest or Dividends Credited to Income $ 145 [55],[59] $ 36 [53],[60]
Investment, interest rate, paid in kind 12.00% [55] 12.00% [53]
Investment, Identifier [Axis]: Skyvault Holdings LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 1,195  
Fair value at ending balance $ 4,046 [8],[12] $ 1,195 [9],[15]
Investment owned, balance (in shares) 1,195,449.6 [8],[12] 1,195,449.6 [9],[15]
Investment, Identifier [Axis]: Skyvault Holdings LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 1,195 [55] $ 0 [53]
Gross Additions 2,860 [54],[55] 1,195 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (9) [55] 0 [53]
Fair value at ending balance [55] 4,046 1,195
Amount of Interest or Dividends Credited to Income $ 0 [55],[59] $ 0 [53],[60]
Investment owned, balance (in shares) 1,195,449.6 [55] 1,195,449.6 [53]
Investment, Identifier [Axis]: SmartShift Group, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 483  
Fair value at ending balance $ 519 [8],[12] $ 483 [9],[15]
Investment owned, balance (in shares) 275 [8],[12] 275 [9],[15]
Investment, Identifier [Axis]: SmartShift Group, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 12,944  
Fair value at ending balance $ 12,912 [11],[12],[25] $ 12,944 [13],[14],[15]
Interest 5.00% [11],[12],[25] 5.00% [13],[14],[15]
Interest 9.30% [11],[12],[25] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: SmartShift Group, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[25] $ 0 [5],[13],[14],[15]
Interest 5.00% [11],[12],[18],[25] 5.00% [5],[13],[14],[15]
Interest 9.30% [11],[12],[18],[25] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: Smartling, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 10,437  
Fair value at ending balance $ 10,410 [11],[12],[25] $ 10,437 [13],[14],[15]
Interest 4.50% [11],[12],[25] 4.50% [13],[14],[15]
Interest 8.90% [11],[12],[25] 9.00% [13],[14],[15]
Investment, Identifier [Axis]: Smartling, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[25] $ 0 [5],[13],[14],[15]
Interest 4.50% [11],[12],[18],[25] 4.50% [5],[13],[14],[15]
Interest 8.90% [11],[12],[18],[25] 9.00% [5],[13],[14],[15]
Investment, Identifier [Axis]: Smile Brands Group Inc., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 1,230  
Fair value at ending balance $ 1,166 [10],[11],[12] $ 1,230 [13],[14],[15]
Interest 6.00% [10],[11],[12] 6.00% [13],[14],[15]
Interest 10.40% [10],[11],[12] 10.70% [13],[14],[15]
Investment, Identifier [Axis]: Smile Brands Group Inc., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 3,477  
Fair value at ending balance $ 3,310 [10],[11],[12] $ 3,477 [13],[14],[15]
Interest 8.50% [10],[11],[12] 8.50% [13],[14],[15]
Interest 12.90% [10],[11],[12] 13.20% [13],[14],[15]
Investment, Identifier [Axis]: Solo Buyer, L.P., Common Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 325  
Fair value at ending balance $ 398 [8],[12] $ 325 [9],[15]
Investment owned, balance (in shares) 516,399 [8],[12] 516,399 [9],[15]
Investment, Identifier [Axis]: Solo Buyer, L.P., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 14,826  
Fair value at ending balance $ 15,279 [10],[11],[12] $ 14,826 [13],[14],[15]
Interest 6.25% [10],[11],[12] 6.25% [13],[14],[15]
Interest 10.60% [10],[11],[12] 10.70% [13],[14],[15]
Investment, Identifier [Axis]: Solo Buyer, L.P., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 466  
Fair value at ending balance $ 862 [10],[11],[12],[18] $ 466 [5],[13],[14],[15]
Interest 6.25% [10],[11],[12],[18] 6.25% [5],[13],[14],[15]
Interest 10.60% [10],[11],[12],[18] 10.70% [5],[13],[14],[15]
Investment, Identifier [Axis]: Sound Point CLO XX, Ltd., Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[7],[9] $ 61  
Fair value at ending balance 44 [2],[6],[8] $ 61 [4],[7],[9]
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] 2,057  
Fair value at ending balance $ 2,052 [10],[11],[12],[18] $ 2,057 [5],[14],[15],[24]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[14],[15],[24]
Interest 9.30% [10],[11],[12],[18] 9.20% [5],[14],[15],[24]
Investment, Identifier [Axis]: Sparus Holdings, LLC (f/k/a Sparus Holdings, Inc.), Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ (1)  
Fair value at ending balance $ 77 [10],[11],[12],[18] $ (1) [5],[14],[15],[24]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[14],[15],[24]
Interest 9.30% [10],[11],[12],[18] 9.20% [5],[14],[15],[24]
Investment, Identifier [Axis]: Spatial Business Systems LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 14,706  
Fair value at ending balance $ 14,878 [10],[11],[12] $ 14,706 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.30% [10],[11],[12] 10.00% [13],[14],[15]
Investment, Identifier [Axis]: Spatial Business Systems LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (21)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (21) [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 10.00% [5],[13],[14],[15]
Investment, Identifier [Axis]: Starnmeer B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[24] $ 2,500  
Fair value at ending balance $ 2,500 [2],[11],[12],[25] $ 2,500 [4],[14],[15],[24]
Interest 5.00% [2],[11],[12],[25] 5.00% [4],[14],[15],[24]
Interest 9.40% [2],[11],[12],[25] 9.60% [4],[14],[15],[24]
Investment, Identifier [Axis]: Superjet Buyer, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 17,712  
Fair value at ending balance $ 17,703 [10],[11],[12],[18] $ 17,712 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 10.10% [10],[11],[12],[18] 10.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: Superjet Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (38)  
Fair value at ending balance $ (35) [10],[11],[12],[18] $ (38) [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 10.10% [10],[11],[12],[18] 10.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: Syniverse Holdings, Inc., Series A Preferred Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 10,076  
Fair value at ending balance $ 10,379 [12] $ 10,076 [15]
Investment owned, balance (in shares) 7,575,758 [12] 7,575,758 [15]
Investment, interest rate, paid in kind 12.50% [12] 12.50% [15]
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 84  
Fair value at ending balance $ 83 [8],[12] $ 84 [9],[15]
Investment owned, balance (in shares) 1,589 [8],[12] 1,589 [9],[15]
Investment, Identifier [Axis]: TA SL Cayman Aggregator Corp., Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 2,785  
Fair value at ending balance $ 2,969 [12] $ 2,785 [15]
Investment, interest rate, paid in kind 7.80% [12] 7.80% [15]
Investment, Identifier [Axis]: TAPCO Buyer LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 13,517  
Fair value at ending balance $ 13,559 [10],[11],[12] $ 13,517 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: TAPCO Buyer LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 252  
Fair value at ending balance $ 261 [8],[12] $ 252 [9],[15]
Investment owned, balance (in shares) 252 [8],[12] 252 [9],[15]
Investment, Identifier [Axis]: TAPCO Buyer LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (44)  
Fair value at ending balance $ (38) [10],[11],[12],[18] $ (44) [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.50% [5],[13],[14],[15]
Investment, Identifier [Axis]: THG Acquisition, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 10,187  
Fair value at ending balance $ 10,246 [11],[12],[18],[23] $ 10,187 [5],[14],[15],[22]
Interest 4.75% [11],[12],[18],[23] 4.75% [5],[14],[15],[22]
Interest 9.00% [11],[12],[18],[23] 9.30% [5],[14],[15],[22]
Investment, Identifier [Axis]: THG Acquisition, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 97  
Fair value at ending balance $ 56 [11],[12],[18],[23] $ 97 [5],[14],[15],[22]
Interest 4.75% [11],[12],[18],[23] 4.75% [5],[14],[15],[22]
Interest 9.00% [11],[12],[18],[23] 9.30% [5],[14],[15],[22]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 2,572  
Fair value at ending balance $ 2,568 [10],[11],[12] $ 2,572 [13],[14],[15]
Interest 5.00% [10],[11],[12] 4.50% [13],[14],[15]
Interest 9.30% [10],[11],[12] 9.00% [13],[14],[15]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 953  
Fair value at ending balance $ 2,142 [10],[11],[12] $ 953 [13],[14],[15]
Interest 5.00% [10],[11],[12] 4.75% [13],[14],[15]
Interest 9.30% [10],[11],[12] 9.30% [13],[14],[15]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 1,192  
Fair value at ending balance $ 7,859 [10],[11],[12],[18] $ 1,192 [13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.50% [13],[14],[15]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., First Lien Senior Secured Term Loan 4    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 7,837  
Fair value at ending balance [5],[13],[14],[15]   $ 7,837
Interest [5],[13],[14],[15]   5.00%
Interest [5],[13],[14],[15]   9.50%
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] 26  
Fair value at ending balance $ 25 [12] $ 26 [15]
Investment owned, balance (in shares) 4,673 [12] 4,673 [15]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (4)  
Fair value at ending balance $ (4) [10],[11],[12],[18] $ (4) [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 9.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: Tank Holding Corp, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 7,792  
Fair value at ending balance $ 7,792 [11],[12],[23] $ 7,792 [14],[15],[24]
Interest 5.75% [11],[12],[23] 5.75% [14],[15],[24]
Interest 10.20% [11],[12],[23] 10.20% [14],[15],[24]
Investment, Identifier [Axis]: Tank Holding Corp, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 2,868  
Fair value at ending balance $ 2,998 [11],[12],[23] $ 2,868 [5],[14],[15],[22]
Interest 6.00% [11],[12],[23] 6.00% [5],[14],[15],[22]
Interest 10.40% [11],[12],[23] 10.70% [5],[14],[15],[22]
Investment, Identifier [Axis]: Tank Holding Corp, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[24] $ (12)  
Fair value at ending balance $ (10) [11],[12],[18],[23] $ (12) [5],[14],[15],[24]
Interest 5.75% [11],[12],[18],[23] 5.75% [5],[14],[15],[24]
Interest 10.20% [11],[12],[18],[23] 10.20% [5],[14],[15],[24]
Investment, Identifier [Axis]: Tanqueray Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[28] $ 1,643  
Fair value at ending balance $ 1,693 [2],[11],[12],[18],[29] $ 1,643 [4],[5],[14],[15],[28]
Interest 5.25% [2],[11],[12],[18],[29] 5.25% [4],[5],[14],[15],[28]
Interest 10.00% [2],[11],[12],[18],[29] 10.00% [4],[5],[14],[15],[28]
Investment, Identifier [Axis]: Team Air Distributing, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 35  
Fair value at ending balance [15]   $ 35
Interest [15]   12.00%
Investment, Identifier [Axis]: Team Air Distributing, LLC, Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] 625  
Fair value at ending balance $ 573 [8],[12] $ 625 [9],[15]
Investment owned, balance (in shares) 516,640.2 [8],[12] 516,640.2 [9],[15]
Investment, Identifier [Axis]: Team Air Distributing, LLC, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 702  
Fair value at ending balance $ 739 [12] $ 702 [15]
Interest 14.00% [12] 12.00% [15]
Investment, Identifier [Axis]: Technology Service Stream BidCo Pty Ltd, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[21] $ 677  
Fair value at ending balance $ 674 [2],[11],[12],[18],[33] $ 677 [4],[5],[14],[15],[21]
Interest 5.25% [2],[11],[12],[18],[33] 5.50% [4],[5],[14],[15],[21]
Interest 9.50% [2],[11],[12],[18],[33] 10.30% [4],[5],[14],[15],[21]
Investment, Identifier [Axis]: Techone B.V., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 3,609  
Fair value at ending balance $ 3,796 [2],[11],[12],[20] $ 3,609 [4],[14],[15],[19]
Interest 5.40% [2],[11],[12],[20] 5.40% [4],[14],[15],[19]
Interest 7.80% [2],[11],[12],[20] 8.70% [4],[14],[15],[19]
Investment, Identifier [Axis]: Techone B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ (4)  
Fair value at ending balance $ 0 [2],[11],[12],[18],[20] $ (4) [4],[5],[14],[15],[19]
Interest 5.40% [2],[11],[12],[18],[20] 5.40% [4],[5],[14],[15],[19]
Interest 7.80% [2],[11],[12],[18],[20] 8.70% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 8,364  
Fair value at ending balance $ 14,010 [10],[11],[12],[18] $ 8,364 [13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 5.00% [13],[14],[15]
Interest 9.20% [10],[11],[12],[18] 9.80% [13],[14],[15]
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (18)  
Fair value at ending balance $ (32) [10],[11],[12],[18] $ (18) [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.20% [10],[11],[12],[18] 9.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: Terrybear, Inc., Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 120  
Fair value at ending balance $ 79 [8],[12] $ 120 [9],[15]
Investment owned, balance (in shares) 24,358.97 [8],[12] 24,358.97 [9],[15]
Investment, Identifier [Axis]: Terrybear, Inc., Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 268  
Fair value at ending balance $ 266 [12] $ 268 [15]
Interest 10.00% [12] 10.00% [15]
Investment, interest rate, paid in kind 4.00% [12] 4.00% [15]
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 2,647  
Fair value at ending balance $ 2,645 [11],[12],[23] $ 2,647 [13],[14],[15]
Interest 4.25% [11],[12],[23] 4.25% [13],[14],[15]
Interest 8.60% [11],[12],[23] 8.80% [13],[14],[15]
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[23] $ 0 [5],[13],[14],[15]
Interest 4.25% [11],[12],[18],[23] 4.25% [5],[13],[14],[15]
Interest 8.60% [11],[12],[18],[23] 8.80% [5],[13],[14],[15]
Investment, Identifier [Axis]: The Caprock Group, Inc. (aka TA/TCG Holdings, LLC), Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[24] $ 3,791  
Fair value at ending balance $ 3,791 [11],[12],[25] $ 3,791 [14],[15],[24]
Interest 7.75% [11],[12],[25] 7.75% [14],[15],[24]
Interest [14],[15],[24]   9.00%
Investment, interest rate, paid in kind 12.20% [11],[12],[25] 3.20% [14],[15],[24]
Investment, Identifier [Axis]: The Octave Music Group, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14] $ 3,595  
Fair value at ending balance $ 3,504 [10],[11] $ 3,595 [13],[14]
Interest 4.75% [10],[11] 4.75% [13],[14]
Interest 9.00% [10],[11] 9.10% [13],[14]
Investment, Identifier [Axis]: The Octave Music Group, Inc., Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 2,180  
Fair value at ending balance $ 2,180 [8],[12] $ 2,180 [15]
Investment owned, balance (in shares) 676,881 [8],[12] 676,881 [15]
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[9] $ 7,208  
Fair value at ending balance [3],[9]   $ 7,208
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 7,208 13,365
Gross Additions 0 [54] 0 [56]
Gross Reductions (959) [57] (5,991) [58]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (12) (166)
Fair value at ending balance 6,237 [1],[8] 7,208
Amount of Interest or Dividends Credited to Income 0 [59] 0 [60]
Investment, Identifier [Axis]: Transportation Insight, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] 8,518  
Fair value at ending balance $ 8,667 [10],[11],[12] $ 8,518 [13],[14],[15]
Interest 4.50% [10],[11],[12] 4.50% [13],[14],[15]
Interest 8.90% [10],[11],[12] 9.20% [13],[14],[15]
Investment, interest rate, paid in kind 1.00% [10],[11],[12] 1.00% [13],[14],[15]
Investment, Identifier [Axis]: Trident Maritime Systems, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 14,420  
Fair value at ending balance $ 14,186 [10],[11],[12] $ 14,420 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.80% [10],[11],[12] 10.30% [13],[14],[15]
Investment, interest rate, paid in kind [10],[11],[12] 2.00%  
Investment, Identifier [Axis]: Trintech, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 6,787  
Fair value at ending balance $ 6,795 [11],[12],[23] $ 6,787 [14],[15],[22]
Interest 5.50% [11],[12],[23] 5.50% [14],[15],[22]
Interest 9.80% [11],[12],[23] 10.10% [14],[15],[22]
Investment, Identifier [Axis]: Trintech, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 145  
Fair value at ending balance $ 147 [11],[12],[18],[23] $ 145 [5],[14],[15],[22]
Interest 5.50% [11],[12],[18],[23] 5.50% [5],[14],[15],[22]
Interest 9.80% [11],[12],[18],[23] 10.10% [5],[14],[15],[22]
Investment, Identifier [Axis]: True Religion Apparel, Inc., Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 0  
Fair value at ending balance [7],[9],[15]   $ 0
Investment owned, balance (in shares) [7],[9],[15]   9.767
Investment, Identifier [Axis]: Turbo Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] 7,754  
Fair value at ending balance $ 7,677 [10],[11],[12] $ 7,754 [13],[14],[15]
Interest 6.00% [10],[11],[12] 6.00% [13],[14],[15]
Interest 10.40% [10],[11],[12] 10.80% [13],[14],[15]
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 4,874  
Fair value at ending balance $ 4,861 [11],[12],[23] $ 4,874 [14],[15],[22]
Interest 6.00% [11],[12],[23] 5.75% [14],[15],[22]
Interest 10.40% [11],[12],[23] 10.40% [14],[15],[22]
Investment, Identifier [Axis]: UBC Ledgers Holding AB, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 536  
Fair value at ending balance $ 559 [2],[10],[11],[12] $ 536 [4],[14],[15],[19]
Interest 5.25% [2],[10],[11],[12] 5.25% [4],[14],[15],[19]
Interest 9.60% [2],[10],[11],[12] 9.60% [4],[14],[15],[19]
Investment, Identifier [Axis]: UBC Ledgers Holding AB, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[36] $ 1,450  
Fair value at ending balance $ 1,595 [2],[11],[12],[18],[72] $ 1,450 [4],[5],[14],[15],[36]
Interest 5.25% [2],[11],[12],[18],[72] 5.25% [4],[5],[14],[15],[36]
Interest 7.60% [2],[11],[12],[18],[72] 8.40% [4],[5],[14],[15],[36]
Investment, Identifier [Axis]: UHY Advisors, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 12,982  
Fair value at ending balance $ 13,247 [10],[11],[12],[18] $ 12,982 [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: UHY Advisors, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (35)  
Fair value at ending balance $ 779 [10],[11],[12],[18] $ (35) [5],[13],[14],[15]
Interest 4.75% [10],[11],[12],[18] 4.75% [5],[13],[14],[15]
Interest 9.00% [10],[11],[12],[18] 9.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: UKFast Leaders Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[28] $ 11,041  
Fair value at ending balance $ 11,403 [2],[11],[12],[29] $ 11,041 [4],[14],[15],[28]
Interest 7.25% [2],[11],[12],[29] 7.25% [4],[14],[15],[28]
Interest 11.80% [2],[11],[12],[29] 12.30% [4],[14],[15],[28]
Investment, Identifier [Axis]: US Bank National Association Series 2025-1, Structured Note - Class R    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [2],[10],[11],[12] $ 7,500  
Interest [2],[10],[11],[12] 7.50%  
Interest [2],[10],[11],[12] 11.90%  
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 12,487  
Fair value at ending balance $ 12,440 [10],[11],[12] $ 12,487 [13],[14],[15]
Interest 5.75% [10],[11],[12] 5.75% [13],[14],[15]
Interest 10.20% [10],[11],[12] 10.50% [13],[14],[15]
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 5,411  
Fair value at ending balance $ 5,397 [10],[11],[12] $ 5,411 [13],[14],[15]
Interest 5.75% [10],[11],[12] 5.75% [13],[14],[15]
Interest 10.20% [10],[11],[12] 10.50% [13],[14],[15]
Investment, Identifier [Axis]: Union Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[30] $ 930  
Fair value at ending balance $ 961 [2],[11],[12],[18],[29] $ 930 [4],[5],[14],[15],[30]
Interest 4.59% [2],[11],[12],[18],[29] 4.84% [4],[5],[14],[15],[30]
Interest 9.30% [2],[11],[12],[18],[29] 9.80% [4],[5],[14],[15],[30]
Investment, Identifier [Axis]: United Therapy Holding III GmbH, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 1,204  
Fair value at ending balance $ 1,455 [2],[11],[12],[18],[20] $ 1,204 [4],[5],[14],[15],[19]
Interest 6.75% [2],[11],[12],[18],[20] 6.75% [4],[5],[14],[15],[19]
Interest 9.20% [2],[11],[12],[18],[20] 10.00% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Unither (Uniholding), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[14],[15],[19] $ 1,962  
Fair value at ending balance $ 2,047 [2],[11],[12],[18],[20] $ 1,962 [4],[5],[14],[15],[19]
Interest 4.93% [2],[11],[12],[18],[20] 4.93% [4],[5],[14],[15],[19]
Interest 7.30% [2],[11],[12],[18],[20] 8.30% [4],[5],[14],[15],[19]
Investment, Identifier [Axis]: Utac Ceram, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[19] $ 1,500  
Fair value at ending balance $ 1,565 [2],[11],[12],[20] $ 1,500 [4],[14],[15],[19]
Interest 4.50% [2],[11],[12],[20] 4.60% [4],[14],[15],[19]
Interest 6.90% [2],[11],[12],[20] 4.90% [4],[14],[15],[19]
Investment, interest rate, paid in kind 2.40% [2],[11],[12],[20] 2.40% [4],[14],[15],[19]
Investment, Identifier [Axis]: Utac Ceram, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 2,471  
Fair value at ending balance $ 937 [2],[10],[11],[12] $ 2,471 [4],[13],[14],[15]
Interest 4.50% [2],[10],[11],[12] 6.75% [4],[13],[14],[15]
Interest 8.80% [2],[10],[11],[12] 9.40% [4],[13],[14],[15]
Investment, interest rate, paid in kind 2.40% [2],[10],[11],[12] 1.80% [4],[13],[14],[15]
Investment, Identifier [Axis]: Utac Ceram, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[13],[14],[15] $ 943  
Fair value at ending balance $ 2,460 [2],[10],[11],[12] $ 943 [4],[13],[14],[15]
Interest 4.50% [2],[10],[11],[12] 6.75% [4],[13],[14],[15]
Interest 9.40% [2],[10],[11],[12] 8.80% [4],[13],[14],[15]
Investment, interest rate, paid in kind 1.80% [2],[10],[11],[12] 2.40% [4],[13],[14],[15]
Investment, Identifier [Axis]: VB Spine Intermediary II LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12] $ 43,527  
Interest [10],[11],[12] 8.50%  
Interest [10],[11],[12] 12.80%  
Investment, Identifier [Axis]: VOYA CLO 2015-2, LTD., Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[7],[9] $ 15  
Fair value at ending balance 81 [2],[6],[8] $ 15 [4],[7],[9]
Investment, Identifier [Axis]: VOYA CLO 2016-2, LTD., Subordinated Structured Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[7],[9] 1,072  
Fair value at ending balance 1,198 [2],[6],[8] 1,072 [4],[7],[9]
Investment, Identifier [Axis]: Validity, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] 4,783  
Fair value at ending balance $ 4,783 [11],[12],[25] $ 4,783 [14],[15],[22]
Interest 5.25% [11],[12],[25] 5.25% [14],[15],[22]
Interest 9.60% [11],[12],[25] 9.90% [14],[15],[22]
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 2  
Fair value at ending balance $ 2 [6],[8],[12] $ 2 [7],[9],[15]
Investment owned, balance (in shares) 4,676 [6],[8],[12] 4,676 [7],[9],[15]
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[15] $ 3  
Fair value at ending balance $ 3 [6],[8],[12] $ 3 [7],[9],[15]
Investment owned, balance (in shares) 5,591 [6],[8],[12] 5,591 [7],[9],[15]
Investment, Identifier [Axis]: Victoria Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 3,787  
Fair value at ending balance $ 3,923 [2],[11],[12],[31] $ 3,787 [4],[14],[15],[30]
Interest 6.50% [2],[11],[12],[31] 6.50% [4],[14],[15],[30]
Interest 11.20% [2],[11],[12],[31] 11.70% [4],[14],[15],[30]
Investment, Identifier [Axis]: Vision Solutions Inc., Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[14] $ 6,256  
Fair value at ending balance $ 6,237 [6],[10],[11] $ 6,256 [7],[13],[14]
Interest 7.25% [6],[10],[11] 7.25% [7],[13],[14]
Interest 11.80% [6],[10],[11] 12.10% [7],[13],[14]
Investment, Identifier [Axis]: Vista Global Holding Ltd, Structured Secured Note - Class C    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 495  
Fair value at ending balance $ 499 [2],[12] $ 495 [4],[15]
Interest 9.50% [2],[12] 9.50% [4],[15]
Investment, Identifier [Axis]: VistaJet Pass Through Trust 2021-1B, Structured Secured Note - Class B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 3,160  
Fair value at ending balance $ 2,811 [12] $ 3,160 [15]
Interest 6.30% [12] 6.30% [15]
Investment, Identifier [Axis]: Vital Buyer, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 7,241  
Fair value at ending balance $ 17,881 [10],[11],[12] $ 7,241 [13],[14],[15]
Interest 4.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.00% [10],[11],[12] 10.00% [13],[14],[15]
Investment, Identifier [Axis]: Vital Buyer, LLC, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 388  
Fair value at ending balance $ 309 [12] $ 388 [15]
Investment owned, balance (in shares) 16,442.9 [12] 16,442.9 [15]
Investment, Identifier [Axis]: W2O Holdings, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 11,772  
Fair value at ending balance $ 14,928 [11],[12],[23] $ 11,772 [13],[14],[15]
Interest 4.75% [11],[12],[23] 4.75% [13],[14],[15]
Interest 9.10% [11],[12],[23] 9.30% [13],[14],[15]
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 2,502  
Fair value at ending balance $ 8,465 [10],[11],[12],[18] $ 2,502 [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [5],[13],[14],[15]
Interest 9.40% [10],[11],[12],[18] 9.70% [5],[13],[14],[15]
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 5,959  
Fair value at ending balance $ 1,817 [10],[11],[12],[18] $ 5,959 [13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.00% [13],[14],[15]
Interest 9.40% [10],[11],[12],[18] 9.70% [13],[14],[15]
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 1,816  
Fair value at ending balance [5],[13],[14],[15]   $ 1,816
Interest [5],[13],[14],[15]   5.00%
Interest [5],[13],[14],[15]   9.70%
Investment, Identifier [Axis]: WWEC Holdings III Corp, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] 12,050  
Fair value at ending balance $ 12,008 [10],[11],[12] $ 12,050 [13],[14],[15]
Interest 5.00% [10],[11],[12] 5.75% [13],[14],[15]
Interest 9.30% [10],[11],[12] 10.40% [13],[14],[15]
Investment, Identifier [Axis]: WWEC Holdings III Corp, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (35)  
Fair value at ending balance $ (37) [10],[11],[12],[18] $ (35) [5],[13],[14],[15]
Interest 5.00% [10],[11],[12],[18] 5.75% [5],[13],[14],[15]
Interest 9.30% [10],[11],[12],[18] 10.40% [5],[13],[14],[15]
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [3],[4] $ 10,730  
Fair value at ending balance [3],[4]   $ 10,730
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 10,730 15,470
Gross Additions 0 [54] 0 [56]
Gross Reductions (1,750) [57] (2,087) [58]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (177) (2,653)
Fair value at ending balance 8,803 [1],[2] 10,730
Amount of Interest or Dividends Credited to Income 301 [59] 3,535 [60]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] 1,802  
Fair value at ending balance $ 1,804 [10],[11],[12] $ 1,802 [13],[14],[15]
Interest 5.50% [10],[11],[12] 5.50% [13],[14],[15]
Interest 9.80% [10],[11],[12] 10.60% [13],[14],[15]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ (36)  
Fair value at ending balance $ 1,170 [10],[11],[12],[18] $ (36) [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 9.80% [10],[11],[12],[18] 10.60% [5],[13],[14],[15]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 8,525  
Fair value at ending balance $ 8,504 [10],[11],[12] $ 8,525 [14],[15],[22]
Interest 6.50% [10],[11],[12] 6.50% [14],[15],[22]
Interest 10.80% [10],[11],[12] 11.10% [14],[15],[22]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 975  
Fair value at ending balance $ 971 [8],[12] $ 975 [9],[15]
Investment owned, balance (in shares) 63,087.1 [8],[12] 63,087.1 [9],[15]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 993  
Fair value at ending balance $ 1,255 [10],[11],[12],[18] $ 993 [5],[14],[15],[22]
Interest 6.50% [10],[11],[12],[18] 6.50% [5],[14],[15],[22]
Interest 10.80% [10],[11],[12],[18] 11.10% [5],[14],[15],[22]
Investment, Identifier [Axis]: White Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[5],[13],[14],[15] $ 1,747  
Fair value at ending balance $ 1,749 [2],[10],[11],[12],[18] $ 1,747 [4],[5],[13],[14],[15]
Interest 5.50% [2],[10],[11],[12],[18] 5.50% [4],[5],[13],[14],[15]
Interest 9.80% [2],[10],[11],[12],[18] 10.20% [4],[5],[13],[14],[15]
Investment, Identifier [Axis]: Woodland Foods, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 1,271  
Fair value at ending balance $ 1,556 [8],[12] $ 1,271 [9],[15]
Investment owned, balance (in shares) 1,663.3 [8],[12] 1,663.3 [9],[15]
Investment, Identifier [Axis]: Woodland Foods, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 6,097  
Fair value at ending balance $ 15,514 [10],[11],[12],[18] $ 6,097 [13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.25% [13],[14],[15]
Interest 10.00% [10],[11],[12],[18] 9.90% [13],[14],[15]
Investment, Identifier [Axis]: Woodland Foods, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [15] $ 427  
Fair value at ending balance [15]   $ 427
Investment owned, balance (in shares) [15]   364.00
Investment, interest rate, paid in kind [15]   20.00%
Investment, Identifier [Axis]: Woodland Foods, LLC, Preferred Stock 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12] $ 448  
Investment owned, balance (in shares) [12] 364.00  
Investment, interest rate, paid in kind [12] 20.00%  
Investment, Identifier [Axis]: Woodland Foods, LLC, Preferred Stock 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12] $ 124  
Investment owned, balance (in shares) [12] 94.60  
Investment, interest rate, paid in kind [12] 20.00%  
Investment, Identifier [Axis]: Woodland Foods, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 1,043  
Fair value at ending balance $ 869 [10],[11],[12],[18] $ 1,043 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.25% [5],[13],[14],[15]
Interest 10.00% [10],[11],[12],[18] 9.90% [5],[13],[14],[15]
Investment, Identifier [Axis]: World 50, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 13,785  
Fair value at ending balance $ 13,862 [10],[11],[12] $ 13,785 [14],[15],[22]
Interest 5.75% [10],[11],[12] 5.75% [14],[15],[22]
Interest 10.00% [10],[11],[12] 10.30% [14],[15],[22]
Investment, Identifier [Axis]: World 50, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ (8)  
Fair value at ending balance $ 0 [10],[11],[12],[18] $ (8) [5],[14],[15],[22]
Interest 5.75% [10],[11],[12],[18] 5.75% [5],[14],[15],[22]
Interest 10.00% [10],[11],[12],[18] 10.30% [5],[14],[15],[22]
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[9],[15] $ 572  
Fair value at ending balance $ 589 [2],[8],[12] $ 572 [4],[9],[15]
Investment owned, balance (in shares) 45,665,825 [2],[8],[12] 45,665,825 [4],[9],[15]
Investment, Identifier [Axis]: Xeinadin Bidco Limited, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[26] $ 283  
Fair value at ending balance $ 298 [2],[11],[12],[27] $ 283 [4],[14],[15],[26]
Interest 5.50% [2],[11],[12],[27] 5.25% [4],[14],[15],[26]
Interest 8.40% [2],[11],[12],[27] 8.20% [4],[14],[15],[26]
Investment, Identifier [Axis]: Xeinadin Bidco Limited, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 8,598  
Fair value at ending balance $ 8,956 [2],[11],[12],[31] $ 8,598 [4],[14],[15],[30]
Interest 5.50% [2],[11],[12],[31] 5.25% [4],[14],[15],[30]
Interest 10.20% [2],[11],[12],[31] 10.00% [4],[14],[15],[30]
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[15] $ 3,691  
Fair value at ending balance $ 3,870 [2],[12] $ 3,691 [4],[15]
Investment, interest rate, paid in kind 11.00% [2],[12] 11.00% [4],[15]
Investment, Identifier [Axis]: ZB Holdco LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[14],[15] $ 9,053  
Fair value at ending balance [13],[14],[15]   $ 9,053
Interest [13],[14],[15]   5.50%
Interest [13],[14],[15]   10.30%
Investment, Identifier [Axis]: ZB Holdco LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12] $ 9,050  
Interest [10],[11],[12] 5.50%  
Interest [10],[11],[12] 10.00%  
Investment, Identifier [Axis]: ZB Holdco LLC, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[11],[12],[18] $ (22)  
Interest [10],[11],[12],[18] 5.50%  
Interest [10],[11],[12],[18] 10.00%  
Investment, Identifier [Axis]: ZB Holdco LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15] $ 197  
Fair value at ending balance $ 222 [8],[12] $ 197 [9],[15]
Investment owned, balance (in shares) 152.69 [8],[12] 152.69 [9],[15]
Investment, Identifier [Axis]: ZB Holdco LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[13],[14],[15] $ 495  
Fair value at ending balance $ 983 [10],[11],[12],[18] $ 495 [5],[13],[14],[15]
Interest 5.50% [10],[11],[12],[18] 5.50% [5],[13],[14],[15]
Interest 10.00% [10],[11],[12],[18] 10.30% [5],[13],[14],[15]
Investment, Identifier [Axis]: Zeppelin Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [4],[14],[15],[30] $ 4,691  
Fair value at ending balance $ 2,873 [2],[11],[12],[31],[38] $ 4,691 [4],[14],[15],[30]
Interest 6.50% [2],[11],[12],[31],[38] 6.25% [4],[14],[15],[30]
Interest [4],[14],[15],[30]   11.20%
Investment, interest rate, paid in kind [2],[11],[12],[31],[38] 11.50%  
Investment, Identifier [Axis]: eShipping, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[22] $ 3,465  
Fair value at ending balance $ 3,300 [11],[12],[23] $ 3,465 [14],[15],[22]
Interest 5.00% [11],[12],[23] 5.00% [14],[15],[22]
Interest 9.30% [11],[12],[23] 9.70% [14],[15],[22]
Investment, Identifier [Axis]: eShipping, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [5],[14],[15],[22] $ 0  
Fair value at ending balance $ 0 [11],[12],[18],[23] $ 0 [5],[14],[15],[22]
Interest 5.00% [11],[12],[18],[23] 5.00% [5],[14],[15],[22]
Interest 9.30% [11],[12],[18],[23] 9.70% [5],[14],[15],[22]
Affiliate investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 397,236 [73] $ 402,423
Gross Additions 16,818 [54] 51,189 [56]
Gross Reductions (3,256) [57] (43,028) [58]
Amount of Realized Gain (Loss) 0 (4,179)
Amount of Unrealized Gain (Loss) (1,861) (9,169)
Fair value at ending balance 408,937 [74] 397,236 [73]
Amount of Interest or Dividends Credited to Income 10,846 [59] 39,605 [60]
Affiliate investments | Celebration Bidco, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [53] 17,676 18,391
Gross Additions 1,504 [54],[55] 200 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (3,173) [55] (915) [53]
Fair value at ending balance 16,007 [55] 17,676 [53]
Amount of Interest or Dividends Credited to Income 221 [55],[59] 837 [53],[60]
Affiliate investments | Coastal Marina Holdings, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 39,893 [55] 34,677 [53]
Gross Additions 35 [54],[55] 6,049 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) 3,140 [55] (833) [53]
Fair value at ending balance [55] 43,068 39,893
Amount of Interest or Dividends Credited to Income 513 [55],[59] 2,139 [53],[60]
Affiliate investments | Eclipse Business Capital, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [53] 151,491 155,889
Gross Additions 1,752 [54],[55] 27,728 [53],[56]
Gross Reductions (547) [55],[57] (23,091) [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (23) [55] (9,035) [53]
Fair value at ending balance 152,673 [55] 151,491 [53]
Amount of Interest or Dividends Credited to Income 4,358 [55],[59] 16,034 [53],[60]
Affiliate investments | Hylan Datacom And Electrical LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [53] 0 10,449
Gross Additions [53],[56]   333
Gross Reductions [53],[58]   (9,637)
Amount of Realized Gain (Loss) [53]   (4,179)
Amount of Unrealized Gain (Loss) [53]   3,034
Fair value at ending balance [53]   0
Amount of Interest or Dividends Credited to Income [53],[60]   492
Affiliate investments | Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 40,761 41,053
Gross Additions 0 [54] 0 [56]
Gross Reductions 0 [57] 0 [58]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (936) (292)
Fair value at ending balance 39,825 40,761
Amount of Interest or Dividends Credited to Income 1,427 [59] 5,709 [60]
Affiliate investments | Rocade Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [53] 83,243 73,957
Gross Additions 2,114 [54],[55] 12,098 [53],[56]
Gross Reductions 0 [55],[57] (2,222) [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) 234 [55] (590) [53]
Fair value at ending balance 85,591 [55] 83,243 [53]
Amount of Interest or Dividends Credited to Income 2,114 [55],[59] 8,598 [53],[60]
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 41,453 39,172
Gross Additions 0 [54] 0 [56]
Gross Reductions 0 [57] 0 [58]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (905) 2,281
Fair value at ending balance 40,548 41,453
Amount of Interest or Dividends Credited to Income 1,767 [59] 2,225 [60]
Affiliate investments | Skyvault Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 4,781 [55] 0 [53]
Gross Additions 11,413 [54],[55] 4,781 [53],[56]
Gross Reductions 0 [55],[57] 0 [53],[58]
Amount of Realized Gain (Loss) 0 [55] 0 [53]
Amount of Unrealized Gain (Loss) (9) [55] 0 [53]
Fair value at ending balance [55] 16,185 4,781
Amount of Interest or Dividends Credited to Income 145 [55],[59] 36 [53],[60]
Affiliate investments | Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 7,208 13,365
Gross Additions 0 [54] 0 [56]
Gross Reductions (959) [57] (5,991) [58]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (12) (166)
Fair value at ending balance 6,237 7,208
Amount of Interest or Dividends Credited to Income 0 [59] 0 [60]
Affiliate investments | Waccamaw River, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 10,730 15,470
Gross Additions 0 [54] 0 [56]
Gross Reductions (1,750) [57] (2,087) [58]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (177) (2,653)
Fair value at ending balance 8,803 10,730
Amount of Interest or Dividends Credited to Income 301 [59] 3,535 [60]
Control investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 79,663 [75] 90,920
Gross Additions 426 [43] 14,141 [44]
Gross Reductions (119) [45] (10,327) [46]
Amount of Realized Gain (Loss) (7,347) (845)
Amount of Unrealized Gain (Loss) 12,629 (14,226)
Fair value at ending balance 85,252 [76] 79,663 [75]
Amount of Interest or Dividends Credited to Income 350 [47] 2,613 [48]
Control investments | Black Angus Steakhouses, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 2,744 [41] 12,035 [42]
Gross Additions 0 [41],[43] 1,114 [42],[44]
Gross Reductions 0 [41],[45] 0 [42],[46]
Amount of Realized Gain (Loss) 0 [41] 0 [42]
Amount of Unrealized Gain (Loss) (105) [41] (10,405) [42]
Fair value at ending balance [41] 2,639 2,744
Amount of Interest or Dividends Credited to Income 0 [41],[47] 1,028 [42],[48]
Control investments | MVC Automotive Group GmbH    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 13,741 [41] 25,192 [42]
Gross Additions 0 [41],[43] 10,340 [42],[44]
Gross Reductions 0 [41],[45] (9,620) [42],[46]
Amount of Realized Gain (Loss) 0 [41] (862) [42]
Amount of Unrealized Gain (Loss) 203 [41] (11,309) [42]
Fair value at ending balance [41] 13,944 13,741
Amount of Interest or Dividends Credited to Income 0 [41],[47] 495 [42],[48]
Control investments | MVC Private Equity Fund LP    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 11 1,005
Gross Additions 0 [43] 0 [44]
Gross Reductions (116) [45] (695) [46]
Amount of Realized Gain (Loss) (7,349) 0
Amount of Unrealized Gain (Loss) 7,454 (299)
Fair value at ending balance 0 11
Amount of Interest or Dividends Credited to Income 0 [47] 48 [48]
Control investments | Security Holdings B.V.    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [42] 63,167 52,688
Gross Additions 426 [41],[43] 2,687 [42],[44]
Gross Reductions (3) [41],[45] (12) [42],[46]
Amount of Realized Gain (Loss) 2 [41] 17 [42]
Amount of Unrealized Gain (Loss) 5,077 [41] 7,787 [42]
Fair value at ending balance 68,669 [41] 63,167 [42]
Amount of Interest or Dividends Credited to Income $ 350 [41],[47] $ 1,042 [42],[48]
[1] Portfolio company does not issue shares or units, member interest is based on commitments.
[2] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 24.0% of total investments at fair value as of March 31, 2025. 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).
[3] Portfolio company does not issue shares or units, member interest is based on commitments.
[4] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 26.1% of total investments at fair value as of December 31, 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).
[5] Position or portion thereof is an unfunded loan or equity commitment.
[6] 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.
[7] 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.
[8] Investment is non-income producing.
[9] Investment is non-income producing.
[10] The interest rate on these loans is subject to 3 Month SOFR, which as of March 31, 2025 was 4.28788%.
[11] Debt investment includes interest rate floor feature.
[12] The fair value of the investment was determined using significant unobservable inputs.
[13] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2024 was 4.30510%.
[14] Debt investment includes interest rate floor feature.
[15] The fair value of the investment was determined using significant unobservable inputs.
[16] PIK non-accrual investment.
[17] PIK non-accrual investment.
[18] Position or portion thereof is an unfunded loan or equity commitment.
[19] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2024 was 2.71400%.
[20] The interest rate on these loans is subject to 3 Month EURIBOR, which as of March 31, 2025 was 2.33600%.
[21] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2024 was 4.49250%.
[22] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2024 was 4.33249%.
[23] The interest rate on these loans is subject to 1 Month SOFR, which as of March 31, 2025 was 4.31937%.
[24] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2024 was 4.25001%.
[25] The interest rate on these loans is subject to 6 Month SOFR, which as of March 31, 2025 was 4.19259%.
[26] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2024 was 2.56800%.
[27] The interest rate on these loans is subject to 6 Month EURIBOR, which as of March 31, 2025 was 2.33600%.
[28] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2024 was 4.62330%.
[29] The interest rate on these loans is subject to 3 Month SONIA, which as of March 31, 2025 was 4.35650%.
[30] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2024 was 4.56370%.
[31] The interest rate on these loans is subject to 6 Month SONIA, which as of March 31, 2025 was 4.27950%.
[32] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2024 was 4.41630%.
[33] The interest rate on these loans is subject to 3 Month BBSY, which as of March 31, 2025 was 4.12540%.
[34] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2024 was 2.84500%.
[35] The interest rate on these loans is subject to 1 Month EURIBOR, which as of March 31, 2025 was 2.35800%.
[36] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2024 was 2.54200%.
[37] Non-accrual investment.
[38] Non-accrual investment.
[39] Non-accrual investment.
[40] The Sierra Credit Support Agreement covers all of the investments acquired by the Company from Sierra in connection with the Sierra Merger and any investments received by the Company in connection with the restructuring, amendment, extension or other modification (including the issuance of new securities) of any of the Sierra Reference Portfolio. Each investment that is included in the Sierra Reference Portfolio is denoted in the above Schedule of Investments with footnote (28).
[41] The fair value of the investment was determined using significant unobservable inputs.
[42] The fair value of the investment was determined using significant unobservable inputs.
[43] 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.
[44] 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.
[45] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[46] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[47] 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.
[48] 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.
[49] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2024 was 4.71030%.
[50] The interest rate on these loans is subject to 1 Month SONIA, which as of March 31, 2025 was 4.46580%.
[51] The interest rate on these loans is subject to 3 Month CORRA, which as of December 31, 2024 was 3.15158%.
[52] The interest rate on these loans is subject to 3 Month CORRA, which as of March 31, 2025 was 2.77000%.
[53] The fair value of the investment was determined using significant unobservable inputs.
[54] 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.
[55] The fair value of the investment was determined using significant unobservable inputs.
[56] 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.
[57] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[58] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[59] 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.
[60] 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.
[61] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2024 was 4.27000%.
[62] The interest rate on these loans is subject to 3 Month BKBM, which as of March 31, 2025 was 3.67000%.
[63] The interest rate on these loans is subject to 6 Month SARON, which as of December 31, 2024 was 1.01720%.
[64] The interest rate on these loans is subject to 3 Month SARON, which as of March 31, 2025 was 0.41000%
[65] 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.
[66] 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.
[67] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2024 was 4.61000%.
[68] The interest rate on these loans is subject to 1 Month NIBOR, which as of March 31, 2025 was 4.49000%.
[69] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2024 was 4.32250%.
[70] The interest rate on these loans is subject to 1 Month BBSY, which as of March 31, 2025 was 4.09500%.
[71] The interest rate on these loans is subject to 6 Month SARON, which as of March 31, 2025 was 0.20632%.
[72] The interest rate on these loans is subject to 3 Month STIBOR, which as of March 31, 2025 was 2.35700%.
[73] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of the portfolio company as the Company owns between 5% or more, up to 25% (inclusive), of the portfolio company’s voting securities (“non-controlled affiliate”). Transactions related to investments in non-controlled “Affiliate Investments” for the year ended December 31, 2024 were as follows:
December 31, 2023
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)December 31, 2024
 Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Celebration Bidco, LLC(d)
First Lien Senior Secured Term Loan (SOFR + 8.00%, 12.6% PIK)
$6,214 $200 $— $— $— $6,414 $837 
Common Stock (1,243,071 shares)
12,177 — — — (915)11,262 — 
18,391 200 — — (915)17,676 837 
Coastal Marina Holdings, LLC(d)
Subordinated Term Loan
(8.0% Cash)
15,649 95 — — 26 15,770 1,428 
Subordinated Term Loan
(8.0% Cash)
6,868 403 — — — 7,271 711 
LLC Units (3,518,097 units)
12,160 5,551 — — (859)16,852 — 
34,677 6,049 — — (833)39,893 2,139 
Eclipse Business Capital, LLC(d)
Revolver (SOFR + 7.25%, 11.9% Cash)
5,545 27,656 (23,091)— (19)10,091 817 
Second Lien Senior Secured Term Loan (7.5% Cash)
4,545 — — (6)4,545 323 
LLC units (89,447,396 units)
145,799 66 — — (9,010)136,855 14,894 
155,889 27,728 (23,091)— (9,035)151,491 16,034 
Hylan Datacom & Electrical LLC(d)
First Lien Senior Secured Term Loan (SOFR + 8.00%, 13.4% Cash)
3,917 172 (3,917)— (172)— 311 
Second Lien Senior Secured Term Loan (SOFR + 3.00%, 8.5% Cash)
4,519 161 (4,680)— — — 181 
Common Stock
(102,144 shares)
2,013 — (1,040)(4,179)3,206 — — 
10,449 333 (9,637)(4,179)3,034 — 492 
Jocassee Partners LLC
9.1% Member Interest
41,053 — — — (292)40,761 5,709 
41,053 — — — (292)40,761 5,709 
Rocade Holdings LLC(d)
Preferred LP Units (71,000 units) (SOFR + 6.00% PIK, 10.3% PIK)
73,113 12,098 (2,222)— 11 83,000 8,598 
Common LP Units (23.8 units)
844 — — — (601)243 — 
73,957 12,098 (2,222)— (590)83,243 8,598 
Sierra Senior Loan Strategy JV I LLC
89.01% Member Interest
39,172 — — — 2,281 41,453 2,225 
39,172 — — — 2,281 41,453 2,225 
Skyvault Holdings LLC(d)
First Lien Senior Secured Term Loan (12.0% PIK)
— 3,586 — — — 3,586 36 
LLC Units (1,195,449.6 units)
— 1,195 — — — 1,195 — 
— 4,781 — — — 4,781 36 
Thompson Rivers LLC
16% Member Interest
13,365 — (5,991)— (166)7,208 — 
13,365 — (5,991)— (166)7,208 — 
December 31, 2023
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)December 31, 2024
 Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Waccamaw River LLC
20% Member Interest
15,470 — (2,087)— (2,653)10,730 3,535 
15,470 — (2,087)— (2,653)10,730 3,535 
Total Affiliate Investments$402,423 $51,189 $(43,028)$(4,179)$(9,169)$397,236 $39,605 
(a)     Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)    Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c) Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Affiliate category.
(d) The fair value of the investment was determined using significant unobservable inputs.
[74] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of the portfolio company as the Company owns between 5% or more, up to 25% (inclusive), of the portfolio company’s voting securities (“non-controlled affiliate”). Transactions related to investments in non-controlled “Affiliate Investments” for the three months ended March 31, 2025 were as follows:
December 31, 2024
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)March 31, 2025
 Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Celebration Bidco, LLC(d)
First Lien Senior Secured Term Loan (SOFR + 8.00%, 12.3% PIK)
$6,414 $1,504 $— $— $(264)$7,654 $221 
Common Stock (1,243,071 shares)
11,262 — — — (2,909)8,353 — 
17,676 1,504 — — (3,173)16,007 221 
Coastal Marina Holdings, LLC(d)
Subordinated Term Loan
(8.0% Cash)
15,770 25 — — 15,800 353 
Subordinated Term Loan
(8.0% Cash)
7,271 10 — — 7,285 160 
LLC Units (3,518,097 units)
16,852 — — — 3,131 19,983 — 
39,893 35 — — 3,140 43,068 513 
Eclipse Business Capital, LLC(d)
Revolver (SOFR + 6.50%, 10.9% Cash)
10,091 1,727 (547)— 11,273 282 
Second Lien Senior Secured Term Loan (7.5% Cash)
4,545 — — (2)4,545 87 
LLC units (89,447,396 units)
136,855 23 — — (23)136,855 3,989 
151,491 1,752 (547)— (23)152,673 4,358 
Jocassee Partners LLC
9.1% Member Interest
40,761 — — — (936)39,825 1,427 
40,761 — — — (936)39,825 1,427 
Rocade Holdings LLC(d)
Preferred LP Units (71,000 units) (SOFR + 6.0% PIK, 10.4% PIK)
83,000 2,114 — — (13)85,101 2,114 
Common LP Units (23.8 units)
243 — — — 247 490 — 
83,243 2,114 — — 234 85,591 2,114 
Sierra Senior Loan Strategy JV I LLC
89.01% Member Interest
41,453 — — — (905)40,548 1,767 
41,453 — — — (905)40,548 1,767 
Skyvault Holdings LLC(d)
First Lien Senior Secured Term Loan (12.0% PIK)
3,586 8,553 — — — 12,139 145 
LLC Units (1,195,449.6 units)
1,195 2,860 — — (9)4,046 — 
4,781 11,413 — — (9)16,185 145 
Thompson Rivers LLC
16.0% Member Interest
7,208 — (959)— (12)6,237 — 
7,208 — (959)— (12)6,237 — 
Waccamaw River LLC
20% Member Interest
10,730 — (1,750)— (177)8,803 301 
10,730 — (1,750)— (177)8,803 301 
Total Affiliate Investments$397,236 $16,818 $(3,256)$ $(1,861)$408,937 $10,846 
(a)     Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)    Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c) Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Affiliate category.
(d) The fair value of the investment was determined using significant unobservable inputs.
[75] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” and “control” the portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the year ended December 31, 2024 in which the portfolio company is deemed to be a “Control Investment” of the Company were as follows:
December 31, 2023
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)December 31, 2024
 Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Black Angus Steakhouses, LLC(d)
First Lien Senior Secured Term Loan (14.4% PIK)(e)
$7,166 $1,114 $— $— $(5,536)$2,744 $1,028 
First Lien Senior Secured Term Loan (10.0% PIK)(e)
4,869 — — — (4,869)— — 
LLC Units (44.6 units)
— — — — — — — 
12,035 1,114 — — (10,405)2,744 1,028 
MVC Automotive Group GmbH(d)
Bridge Loan (4.5% Cash, 1.5% PIK)
9,762 720 (9,620)(862)— — 495 
Common Equity Interest (18,000 Shares)
15,430 9,620 — — (11,309)13,741 — 
25,192 10,340 (9,620)(862)(11,309)13,741 495 
MVC Private Equity Fund LP
General Partnership Interest
(1,831.4 units)
24 — (17)— (7)— 48 
Limited Partnership Interest
(71,790.4 units)
981 — (678)— (292)11 — 
1,005 — (695)— (299)11 48 
Security Holdings B.V(d)
Bridge Loan (5.0% PIK)
6,328 327 — — — 6,655 326 
Revolver (6.0% Cash)
3,866 1,828 (12)17 (366)5,333 188 
Senior Subordinated Term Loan (3.1% PIK)
10,867 324 — — — 11,191 273 
Senior Unsecured Term Loan (6.0% Cash, 9.0% PIK)
2,236 208 — — (151)2,293 255 
Common Stock Series A (17,100 shares)
311 — — — 88 399 — 
Common Stock Series B (1,236 shares)
29,080 — — — 8,216 37,296 — 
52,688 2,687 (12)17 7,787 63,167 1,042 
Total Control Investments$90,920 $14,141 $(10,327)$(845)$(14,226)$79,663 $2,613 
(a) Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)     Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c)    Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.
[76] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” and “control” the portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the three months ended March 31, 2025 in which the portfolio company is deemed to be a “Control Investment” of the Company were as follows:
December 31, 2024
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)March 31, 2025
 Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Black Angus Steakhouses, LLC(d)
First Lien Senior Secured Term Loan (14.4% PIK)(e)
$2,744 $— $— $— $(105)$2,639 $— 
First Lien Senior Secured Term Loan (10.0% PIK)(e)
— — — — — — — 
LLC Units (44.6 units)
— — — — — — — 
2,744 — — — (105)2,639 — 
MVC Automotive Group GmbH(d)
Common Equity Interest (18,000 Shares)
13,741 — — — 203 13,944 — 
13,741 — — — 203 13,944 — 
MVC Private Equity Fund LP
General Partnership Interest
(1,831.4 units)
— — — (183)183 — — 
Limited Partnership Interest
(71,790.4 units)
11 — (116)(7,166)7,271 — — 
11 — (116)(7,349)7,454 — — 
Security Holdings B.V(d)
Bridge Loan (5.0% PIK)
6,655 — — — — 6,655 83 
Revolver (6.0% PIK)
5,333 165 (3)228 5,725 85 
Senior Subordinated Term Loan (3.1% PIK)
11,191 154 — — — 11,345 88 
Senior Unsecured Term Loan (9.0% PIK)
2,293 107 — — 100 2,500 94 
Common Stock Series A (17,100 shares)
399 — — — 50 449 — 
Common Stock Series B (1,236 shares)
37,296 — — — 4,699 41,995 — 
63,167 426 (3)5,077 68,669 350 
Total Control Investments$79,663 $426 $(119)$(7,347)$12,629 $85,252 $350 
(a) Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)     Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c)    Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.