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Unaudited Consolidated Schedule of Investments - Schedule Of Investments (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [1] $ 2,449,272  
Fair value at ending balance $ 2,536,315 [2] $ 2,449,272 [1]
Jocassee Partners LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 9.10% [3],[4],[5] 9.10% [6],[7],[8],[9]
Sierra Senior Loan Strategy JV I LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 89.01% [3],[4],[5],[10] 89.01% [6],[7],[8],[11]
Thompson Rivers LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 16.00% [3],[4],[12] 16.00% [6],[7],[13]
Waccamaw River LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Ownership percent 20.00% [3],[4],[5] 20.00% [6],[7],[8]
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 [14],[15],[16] $ 7,049  
Fair value at ending balance [14],[15],[16]   $ 7,049
Basis spread on variable rate [14],[15],[16]   4.75%
Interest rate, cash [14],[15],[16]   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 [8],[16],[17] 8,479  
Fair value at ending balance $ 7,805 [5],[18],[19] $ 8,479 [8],[16],[17]
Investment, interest rate, paid in kind 7.60% [5],[18],[19] 7.60% [8],[16],[17]
Interest rate, cash 6.70% [5],[18],[19] 6.70% [8],[16],[17]
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 [9],[14],[15],[16] $ 10,099  
Fair value at ending balance $ 12,982 [19],[20],[21],[22] $ 10,099 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.80% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
Investment, Identifier [Axis]: AD Bidco, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 0  
Fair value at ending balance $ (16) [19],[20],[21],[22] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.80% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
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 [8],[14],[15],[16] $ 6,523  
Fair value at ending balance [8],[14],[15],[16]   $ 6,523
Basis spread on variable rate [8],[14],[15],[16]   9.25%
Interest rate, cash [8],[14],[15],[16]   13.70%
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 [13],[16] 550  
Fair value at ending balance $ 665 [12],[19] $ 550 [13],[16]
Investment owned, balance (in shares) 348.68 [12],[19] 348.68 [13],[16]
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 [8],[11],[16] $ 1,733  
Fair value at ending balance 0 [5],[10],[12],[19] $ 1,733 [8],[11],[16]
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 [8],[15],[16],[23] 2,370  
Fair value at ending balance $ 2,702 [5],[19],[21],[24] $ 2,370 [8],[15],[16],[23]
Basis spread on variable rate 5.40% [5],[19],[21],[24] 5.40% [8],[15],[16],[23]
Interest rate, cash 7.40% [5],[19],[21],[24] 8.70% [8],[15],[16],[23]
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 [8],[15],[16],[25] $ 864  
Fair value at ending balance [8],[15],[16],[25]   $ 864
Basis spread on variable rate [8],[15],[16],[25]   7.30%
Interest rate, cash [8],[15],[16],[25]   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 [16] 869  
Fair value at ending balance $ 848 [19] $ 869 [16]
Investment owned, balance (in shares) 25,718.2 [19] 25,718.2 [16]
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 [15],[16],[26] $ 7,344  
Fair value at ending balance $ 5,444 [19],[21],[27] $ 7,344 [15],[16],[26]
Basis spread on variable rate 4.50% [19],[21],[27] 4.75% [15],[16],[26]
Interest rate, cash 8.60% [19],[21],[27] 9.40% [15],[16],[26]
Investment, Identifier [Axis]: ASC Communications, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 0  
Fair value at ending balance $ (8) [19],[21],[22],[27] $ 0 [9],[15],[16],[26]
Basis spread on variable rate 4.50% [19],[21],[22],[27] 4.75% [9],[15],[16],[26]
Interest rate, cash 8.60% [19],[21],[22],[27] 9.40% [9],[15],[16],[26]
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 [14],[15],[16] $ 19,021  
Fair value at ending balance $ 18,963 [19],[20],[21] $ 19,021 [14],[15],[16]
Basis spread on variable rate 5.25% [19],[20],[21] 5.25% [14],[15],[16]
Interest rate, cash 9.60% [19],[20],[21] 9.80% [14],[15],[16]
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 [9],[14],[15],[16] $ (49)  
Fair value at ending balance $ (35) [19],[20],[21],[22] $ (49) [9],[14],[15],[16]
Basis spread on variable rate 5.25% [19],[20],[21],[22] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.60% [19],[20],[21],[22] 9.80% [9],[14],[15],[16]
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 [15],[26] $ 148  
Fair value at ending balance [15],[26]   $ 148
Basis spread on variable rate [15],[26]   3.50%
Interest rate, cash [15],[26]   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 [15],[26] 2  
Fair value at ending balance [15],[26]   $ 2
Basis spread on variable rate [15],[26]   5.50%
Interest rate, cash [15],[26]   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 [13],[16] 6,347  
Fair value at ending balance [13],[16]   $ 6,347
Investment owned, balance (in shares) [13],[16]   5,018
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 [13],[16] 2,285  
Fair value at ending balance [13],[16]   $ 2,285
Investment owned, balance (in shares) [13],[16]   1,657
Investment, Identifier [Axis]: Accelerant Holdings, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12] $ 3,742  
Investment owned, balance (in shares) [12] 279,230  
Investment, Identifier [Axis]: Accelerant Holdings, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 7,840  
Fair value at ending balance [13],[16]   $ 7,840
Investment owned, balance (in shares) [13],[16]   4,243
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 [19],[21],[22],[27] $ 595  
Basis spread on variable rate [19],[21],[22],[27] 4.50%  
Interest rate, cash [19],[21],[22],[27] 8.60%  
Investment, Identifier [Axis]: Accelevation LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ 159  
Basis spread on variable rate [19],[21],[22],[27] 4.50%  
Interest rate, cash [19],[21],[22],[27] 8.60%  
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 [8],[15],[16],[28] $ 2,438  
Fair value at ending balance $ 5,884 [5],[19],[20],[21],[22] $ 2,438 [8],[15],[16],[28]
Basis spread on variable rate 6.13% [5],[19],[20],[21],[22] 6.75% [8],[15],[16],[28]
Interest rate, cash 10.50% [5],[19],[20],[21],[22] 11.80% [8],[15],[16],[28]
Investment, Identifier [Axis]: Acclime Holdings HK Limited, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19] $ 230  
Interest rate, cash [5],[19] 15.00%  
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 0  
Fair value at ending balance $ 0 [12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 437,623.3 [12],[19] 437,623.3 [13],[16]
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 [14],[15],[16] $ 11,612  
Fair value at ending balance $ 12,930 [19],[20],[21] $ 11,612 [14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21] 5.75% [14],[15],[16]
Interest rate, cash 10.20% [19],[20],[21] 10.30% [14],[15],[16]
Investment, Identifier [Axis]: Accurus Aerospace Corporation, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 0  
Investment owned, balance (in shares) [12],[19] 18,151.3  
Investment, Identifier [Axis]: Accurus Aerospace Corporation, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 1,768  
Fair value at ending balance $ 606 [19],[20],[21],[22] $ 1,768 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.75% [9],[14],[15],[16]
Interest rate, cash 10.20% [19],[20],[21],[22] 10.30% [9],[14],[15],[16]
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 [8],[15],[16],[29] $ 5,412  
Fair value at ending balance $ 3,611 [5],[19],[21],[24],[30] $ 5,412 [8],[15],[16],[29]
Basis spread on variable rate 2.90% [5],[19],[21],[24],[30] 2.90% [8],[15],[16],[29]
Investment, interest rate, paid in kind [8],[15],[16],[29]   6.60%
Interest rate, cash [8],[15],[16],[29]   4.00%
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 [8],[9],[15],[16],[23] $ 1,716  
Fair value at ending balance $ 2,309 [5],[19],[21],[22],[24] $ 1,716 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.15% [5],[19],[21],[22],[24] 5.75% [8],[9],[15],[16],[23]
Interest rate, cash 7.20% [5],[19],[21],[22],[24] 9.10% [8],[9],[15],[16],[23]
Investment, Identifier [Axis]: Adhefin International, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[15],[16],[23] $ 326  
Fair value at ending balance [8],[15],[16],[23]   $ 326
Basis spread on variable rate [8],[15],[16],[23]   10.50%
Investment, interest rate, paid in kind [8],[15],[16],[23]   13.20%
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 [13],[16] 593  
Fair value at ending balance $ 543 [12],[19] $ 593 [13],[16]
Investment owned, balance (in shares) 8,717.76 [12],[19] 8,717.76 [13],[16]
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 [13],[16] $ 153  
Fair value at ending balance $ 140 [12],[19] $ 153 [13],[16]
Investment owned, balance (in shares) 2,248.46 [12],[19] 2,248.46 [13],[16]
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 [13],[16] $ 0  
Fair value at ending balance $ 0 [12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 8,717.76 [12],[19] 8,717.76 [13],[16]
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 [13],[16] $ 0  
Fair value at ending balance $ 0 [12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 2,248.46 [12],[19] 2,248.46 [13],[16]
Investment, Identifier [Axis]: Aegros Holdco 2 Ltd, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[12],[19] $ 587  
Investment owned, balance (in shares) [5],[12],[19] 889,464  
Investment, Identifier [Axis]: Aegros Holdco 2 Ltd, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[31] $ 5,309  
Basis spread on variable rate [5],[19],[31] 8.50%  
Investment, interest rate, paid in kind [5],[19],[31] 13.00%  
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 $ 1,799 $ 2,411
Interest rate, cash 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 [14],[15],[16] $ 2,710  
Fair value at ending balance $ 3,194 [19],[20],[21] $ 2,710 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21] 5.00% [14],[15],[16]
Interest rate, cash 9.20% [19],[20],[21] 9.40% [14],[15],[16]
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 [9],[14],[15],[16] $ 3,828  
Fair value at ending balance $ 3,211 [19],[20],[21],[22] $ 3,828 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.75% [9],[14],[15],[16]
Interest rate, cash 10.00% [19],[20],[21],[22] 10.20% [9],[14],[15],[16]
Investment, Identifier [Axis]: AirX Climate Solutions, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 0  
Fair value at ending balance $ (7) [19],[20],[21],[22] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.75% [9],[14],[15],[16]
Interest rate, cash 10.00% [19],[20],[21],[22] 10.20% [9],[14],[15],[16]
Investment, Identifier [Axis]: Aldinger Company, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19] $ 6,795  
Investment, interest rate, paid in kind [19] 13.50%  
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 [8],[9],[15],[16],[29] $ 4,569  
Fair value at ending balance $ 5,485 [5],[19],[21],[32] $ 4,569 [8],[9],[15],[16],[29]
Basis spread on variable rate 7.00% [5],[19],[21],[32] 5.75% [8],[9],[15],[16],[29]
Interest rate, cash 9.10% [5],[19],[21],[32] 8.90% [8],[9],[15],[16],[29]
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 [11],[14],[15],[16] $ 22,949  
Fair value at ending balance $ 12,743 [10],[19],[20],[21] $ 22,949 [11],[14],[15],[16]
Basis spread on variable rate 5.50% [10],[19],[20],[21] 6.00% [11],[14],[15],[16]
Interest rate, cash 10.00% [10],[19],[20],[21] 10.70% [11],[14],[15],[16]
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 [8],[13],[16] $ 1,239  
Fair value at ending balance $ 2,663 [5],[12],[19] $ 1,239 [8],[13],[16]
Investment owned, balance (in shares) 98,906,608 [5],[12],[19] 98,906,608 [8],[13],[16]
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 [8],[16] $ 290  
Fair value at ending balance $ 348 [5],[19] $ 290 [8],[16]
Investment, interest rate, paid in kind [8],[16]   17.50%
Interest rate, cash [5],[19] 15.50%  
Investment, Identifier [Axis]: Amalfi Midco, Subordinated Loan Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[16] $ 5,492  
Fair value at ending balance $ 6,411 [5],[19] $ 5,492 [8],[16]
Investment, interest rate, paid in kind 9.00% [5],[19] 9.00% [8],[16]
Interest rate, cash 2.00% [5],[19] 2.00% [8],[16]
Investment, Identifier [Axis]: Amalfi Midco, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[13],[16] $ 919  
Fair value at ending balance $ 1,065 [5],[12],[19] $ 919 [8],[13],[16]
Investment owned, balance (in shares) 380,385 [5],[12],[19] 380,385 [8],[13],[16]
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 [13],[16] $ 119  
Fair value at ending balance $ 119 [12],[19] $ 119 [13],[16]
Investment owned, balance (in shares) 88,110 [12],[19] 88,110 [13],[16]
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 [15],[16],[26] $ 2,611  
Fair value at ending balance $ 2,489 [19],[21],[27] $ 2,611 [15],[16],[26]
Basis spread on variable rate 5.00% [19],[21],[27] 5.00% [15],[16],[26]
Interest rate, cash 9.20% [19],[21],[27] 9.60% [15],[16],[26]
Investment, Identifier [Axis]: Americo Chemical Products, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ (7)  
Fair value at ending balance $ (5) [19],[21],[22],[27] $ (7) [9],[15],[16],[26]
Basis spread on variable rate 5.00% [19],[21],[22],[27] 5.00% [9],[15],[16],[26]
Interest rate, cash 9.20% [19],[21],[22],[27] 9.60% [9],[15],[16],[26]
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 [8],[15],[16],[23] $ 2,995  
Fair value at ending balance $ 6,227 [5],[19],[21],[24] $ 2,995 [8],[15],[16],[23]
Basis spread on variable rate 5.08% [5],[19],[21],[24] 6.20% [8],[15],[16],[23]
Interest rate, cash 7.10% [5],[19],[21],[24] 9.30% [8],[15],[16],[23]
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 [8],[15],[16],[29] $ 1,576  
Fair value at ending balance $ 1,012 [5],[19],[20],[21] $ 1,576 [8],[15],[16],[29]
Basis spread on variable rate 5.08% [5],[19],[20],[21] 6.20% [8],[15],[16],[29]
Interest rate, cash 9.70% [5],[19],[20],[21] 9.90% [8],[15],[16],[29]
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 [8],[15],[16],[29] $ 904  
Fair value at ending balance [8],[15],[16],[29]   $ 904
Basis spread on variable rate [8],[15],[16],[29]   6.95%
Interest rate, cash [8],[15],[16],[29]   10.70%
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 [8],[14],[15],[16] 1,008  
Fair value at ending balance [8],[14],[15],[16]   $ 1,008
Basis spread on variable rate [8],[14],[15],[16]   6.20%
Interest rate, cash [8],[14],[15],[16]   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 [8],[15],[16],[33] 3,180  
Fair value at ending balance $ 3,358 [5],[19],[21],[34] $ 3,180 [8],[15],[16],[33]
Basis spread on variable rate 7.00% [5],[19],[21],[34] 6.25% [8],[15],[16],[33]
Interest rate, cash 11.10% [5],[19],[21],[34] 11.30% [8],[15],[16],[33]
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 [8],[16] $ 297  
Fair value at ending balance $ 352 [5],[19] $ 297 [8],[16]
Investment, interest rate, paid in kind 9.00% [5],[19] 8.00% [8],[16]
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 [8],[11] $ 3,272  
Fair value at ending balance 2,896 [5],[10] $ 3,272 [8],[11]
Investment, Identifier [Axis]: Application Boot Camp LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19] $ 256  
Investment owned, balance (in shares) [19] 234,751.8  
Investment, Identifier [Axis]: Application Boot Camp LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 1,199  
Basis spread on variable rate [19],[20],[21] 5.00%  
Interest rate, cash [19],[20],[21] 9.30%  
Investment, Identifier [Axis]: Application Boot Camp LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (7)  
Basis spread on variable rate [19],[20],[21],[22] 5.00%  
Interest rate, cash [19],[20],[21],[22] 9.30%  
Investment, Identifier [Axis]: Application Boot Camp LLC, Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19] $ 82  
Interest rate, cash [19] 14.00%  
Investment, Identifier [Axis]: Aptus 1829. GmbH, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[13],[16] $ 0  
Fair value at ending balance $ 0 [5],[12],[19] $ 0 [8],[13],[16]
Investment owned, balance (in shares) 48 [5],[12],[19] 48 [8],[13],[16]
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 [8],[15],[16],[29] $ 1,994  
Fair value at ending balance $ 3,614 [5],[19],[21],[32] $ 1,994 [8],[15],[16],[29]
Basis spread on variable rate 5.75% [5],[19],[21],[32] 5.75% [8],[15],[16],[29]
Interest rate, cash 7.80% [5],[19],[21],[32] 8.40% [8],[15],[16],[29]
Investment, Identifier [Axis]: Aptus 1829. GmbH, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[13],[16] $ 40  
Fair value at ending balance $ 66 [5],[12],[19] $ 40 [8],[13],[16]
Investment owned, balance (in shares) 13 [5],[12],[19] 13 [8],[13],[16]
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 [8],[15],[16],[35] $ 3,608  
Fair value at ending balance $ 3,878 [5],[19],[21],[36] $ 3,608 [8],[15],[16],[35]
Basis spread on variable rate 5.00% [5],[19],[21],[36] 5.50% [8],[15],[16],[35]
Interest rate, cash 9.20% [5],[19],[21],[36] 10.70% [8],[15],[16],[35]
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 [8],[9],[15],[16],[33] $ 6,314  
Fair value at ending balance $ 6,787 [5],[19],[21],[36] $ 6,314 [8],[9],[15],[16],[33]
Basis spread on variable rate 6.00% [5],[19],[21],[36] 6.00% [8],[9],[15],[16],[33]
Interest rate, cash 10.20% [5],[19],[21],[36] 10.60% [8],[9],[15],[16],[33]
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 [8],[15],[16],[33] $ 2,119  
Fair value at ending balance $ 2,452 [5],[19],[21],[36] $ 2,119 [8],[15],[16],[33]
Basis spread on variable rate 10.50% [5],[19],[21],[36] 10.50% [8],[15],[16],[33]
Investment, interest rate, paid in kind 15.10% [5],[19],[21],[36] 15.10% [8],[15],[16],[33]
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 [8],[9],[15],[16],[23] $ 3,807  
Fair value at ending balance $ 4,344 [5],[19],[21],[22],[32] $ 3,807 [8],[9],[15],[16],[23]
Basis spread on variable rate 4.00% [5],[19],[21],[22],[32] 5.97% [8],[9],[15],[16],[23]
Interest rate, cash 6.00% [5],[19],[21],[22],[32] 9.30% [8],[9],[15],[16],[23]
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 [14],[15],[16] $ 8,769  
Fair value at ending balance $ 8,683 [19],[21],[27] $ 8,769 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[27] 4.75% [14],[15],[16]
Interest rate, cash 8.90% [19],[21],[27] 9.50% [14],[15],[16]
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 [8],[15],[16],[23] $ 5,676  
Fair value at ending balance $ 6,336 [5],[19],[21],[24] $ 5,676 [8],[15],[16],[23]
Basis spread on variable rate 7.00% [5],[19],[21],[24] 6.50% [8],[15],[16],[23]
Interest rate, cash 9.00% [5],[19],[21],[24] 9.80% [8],[15],[16],[23]
Investment, Identifier [Axis]: Argus Bidco Limited, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[13],[16] $ 0  
Fair value at ending balance $ 0 [5],[12],[19] $ 0 [8],[13],[16]
Investment owned, balance (in shares) 464 [5],[12],[19] 464 [8],[13],[16]
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 [8],[16] $ 33  
Fair value at ending balance $ 30 [5],[19] $ 33 [8],[16]
Investment, interest rate, paid in kind 10.00% [5],[19] 10.00% [8],[16]
Investment owned, balance (in shares) 41,560 [5],[19] 41,560 [8],[16]
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 [8],[15],[16],[23] $ 1,773  
Fair value at ending balance $ 2,033 [5],[19],[21],[32] $ 1,773 [8],[15],[16],[23]
Basis spread on variable rate 4.00% [5],[19],[21],[32] 4.00% [8],[15],[16],[23]
Investment, interest rate, paid in kind 3.20% [5],[19],[21],[32] 2.80% [8],[15],[16],[23]
Interest rate, cash 6.10% [5],[19],[21],[32] 7.20% [8],[15],[16],[23]
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 [8],[14],[15],[16] $ 127  
Fair value at ending balance $ 129 [5],[19],[21],[37] $ 127 [8],[14],[15],[16]
Basis spread on variable rate 4.00% [5],[19],[21],[37] 4.00% [8],[14],[15],[16]
Investment, interest rate, paid in kind 3.20% [5],[19],[21],[37] 2.80% [8],[14],[15],[16]
Interest rate, cash 8.10% [5],[19],[21],[37] 8.80% [8],[14],[15],[16]
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 [8],[9],[15],[16],[33] $ 1,584  
Fair value at ending balance $ 1,759 [5],[19],[21],[36] $ 1,584 [8],[9],[15],[16],[33]
Basis spread on variable rate 4.00% [5],[19],[21],[36] 4.00% [8],[9],[15],[16],[33]
Investment, interest rate, paid in kind 3.20% [5],[19],[21],[36] 2.80% [8],[9],[15],[16],[33]
Interest rate, cash 8.00% [5],[19],[21],[36] 8.90% [8],[9],[15],[16],[33]
Investment, Identifier [Axis]: Argus Bidco Limited, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[16] $ 33  
Fair value at ending balance $ 30 [5],[19] $ 33 [8],[16]
Investment, interest rate, paid in kind 10.00% [5],[19] 10.00% [8],[16]
Investment owned, balance (in shares) 41,560 [5],[19] 41,560 [8],[16]
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 [8],[16] $ 777  
Fair value at ending balance $ 914 [5],[19] $ 777 [8],[16]
Investment, interest rate, paid in kind 10.50% [5],[19] 10.50% [8],[16]
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 [14],[15],[16] $ 5,637  
Fair value at ending balance $ 6,433 [19],[21],[37] $ 5,637 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[37] 5.50% [14],[15],[16]
Interest rate, cash 9.20% [19],[21],[37] 10.10% [14],[15],[16]
Investment, Identifier [Axis]: Armstrong Transport Group (Pele Buyer, LLC), Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[37] $ 1  
Basis spread on variable rate [19],[21],[22],[37] 5.00%  
Interest rate, cash [19],[21],[22],[37] 9.20%  
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 [8],[9],[15],[16],[23] $ 256  
Fair value at ending balance $ 472 [5],[19],[21],[22],[24] $ 256 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.00% [5],[19],[21],[22],[24] 5.00% [8],[9],[15],[16],[23]
Interest rate, cash 7.00% [5],[19],[21],[22],[24] 8.00% [8],[9],[15],[16],[23]
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 [8],[15],[16],[23] $ 396  
Fair value at ending balance $ 449 [5],[19],[21],[24] $ 396 [8],[15],[16],[23]
Basis spread on variable rate 5.50% [5],[19],[21],[24] 5.50% [8],[15],[16],[23]
Interest rate, cash 7.50% [5],[19],[21],[24] 8.50% [8],[15],[16],[23]
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 [8],[9],[15],[16],[35] $ 2,365  
Fair value at ending balance $ 2,606 [5],[19],[21],[36] $ 2,365 [8],[9],[15],[16],[35]
Basis spread on variable rate 5.75% [5],[19],[21],[36] 5.75% [8],[9],[15],[16],[35]
Interest rate, cash 10.00% [5],[19],[21],[36] 10.50% [8],[9],[15],[16],[35]
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 [8],[15],[16],[29] $ 1,351  
Fair value at ending balance $ 1,569 [5],[19],[21],[24] $ 1,351 [8],[15],[16],[29]
Basis spread on variable rate 6.25% [5],[19],[21],[24] 7.25% [8],[15],[16],[29]
Interest rate, cash 8.30% [5],[19],[21],[24] 10.40% [8],[15],[16],[29]
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 [8],[15],[16],[35] $ 782  
Fair value at ending balance $ 860 [5],[19],[21],[34] $ 782 [8],[15],[16],[35]
Basis spread on variable rate 6.25% [5],[19],[21],[34] 6.25% [8],[15],[16],[35]
Interest rate, cash 10.20% [5],[19],[21],[34] 11.20% [8],[15],[16],[35]
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 [8],[9],[15],[16],[38] $ 1,967  
Fair value at ending balance $ 1,599 [5],[19],[21],[22],[39] $ 1,967 [8],[9],[15],[16],[38]
Basis spread on variable rate 4.50% [5],[19],[21],[22],[39] 4.50% [8],[9],[15],[16],[38]
Interest rate, cash 8.10% [5],[19],[21],[22],[39] 8.90% [8],[9],[15],[16],[38]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 288  
Fair value at ending balance $ 319 [12],[19] $ 288 [13],[16]
Investment owned, balance (in shares) 192,307.7 [12],[19] 192,307.7 [13],[16]
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 [9],[15],[16],[26] $ 4,785  
Fair value at ending balance $ 4,750 [19],[21],[27] $ 4,785 [9],[15],[16],[26]
Basis spread on variable rate 5.25% [19],[21],[27] 5.25% [9],[15],[16],[26]
Interest rate, cash 9.50% [19],[21],[27] 9.90% [9],[15],[16],[26]
Investment, Identifier [Axis]: Azalea Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 0  
Fair value at ending balance $ 0 [19],[21],[22],[27] $ 0 [9],[15],[16],[26]
Basis spread on variable rate 5.25% [19],[21],[22],[27] 5.25% [9],[15],[16],[26]
Interest rate, cash 9.50% [19],[21],[22],[27] 9.90% [9],[15],[16],[26]
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 [16] $ 1,805  
Fair value at ending balance $ 1,982 [19] $ 1,805 [16]
Investment, interest rate, paid in kind 12.00% [19] 12.00% [16]
Investment, Identifier [Axis]: BKF Buyer, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 1,045  
Fair value at ending balance $ 1,115 [12],[19] $ 1,045 [13],[16]
Investment owned, balance (in shares) 1,004,467 [12],[19] 1,004,467 [13],[16]
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 [15],[16],[26] $ 8,015  
Fair value at ending balance $ 7,995 [19],[21],[27] $ 8,015 [15],[16],[26]
Basis spread on variable rate 5.00% [19],[21],[27] 5.00% [15],[16],[26]
Interest rate, cash 9.20% [19],[21],[27] 9.30% [15],[16],[26]
Investment, Identifier [Axis]: BKF Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ (52)  
Fair value at ending balance $ (37) [19],[21],[22],[27] $ (52) [9],[15],[16],[26]
Basis spread on variable rate 5.00% [19],[21],[22],[27] 5.00% [9],[15],[16],[26]
Interest rate, cash 9.20% [19],[21],[22],[27] 9.30% [9],[15],[16],[26]
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 [15],[16],[40] $ 9,302  
Fair value at ending balance $ 10,607 [19],[21],[41] $ 9,302 [15],[16],[40]
Basis spread on variable rate 5.50% [19],[21],[41] 5.50% [15],[16],[40]
Interest rate, cash 7.40% [19],[21],[41] 8.50% [15],[16],[40]
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 [14],[15],[16] $ 12,560  
Fair value at ending balance $ 11,699 [19],[20],[21] $ 12,560 [14],[15],[16]
Basis spread on variable rate 2.00% [19],[20],[21] 6.00% [14],[15],[16]
Investment, interest rate, paid in kind [19],[20],[21] 5.00%  
Interest rate, cash 6.00% [19],[20],[21] 10.60% [14],[15],[16]
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 [15],[16],[23] $ 9,482  
Fair value at ending balance [15],[16],[23]   $ 9,482
Basis spread on variable rate [15],[16],[23]   9.50%
Interest rate, cash [15],[16],[23]   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 [8],[15],[16],[29] 3,107  
Fair value at ending balance $ 2,458 [5],[19],[21],[24] $ 3,107 [8],[15],[16],[29]
Basis spread on variable rate 4.00% [5],[19],[21],[24] 4.75% [8],[15],[16],[29]
Investment, interest rate, paid in kind [5],[19],[21],[24] 2.50%  
Interest rate, cash 6.00% [5],[19],[21],[24] 7.30% [8],[15],[16],[29]
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 [9],[15],[16],[26] $ 13,949  
Fair value at ending balance $ 7,664 [19],[21],[22],[37] $ 13,949 [9],[15],[16],[26]
Basis spread on variable rate 4.75% [19],[21],[22],[37] 5.00% [9],[15],[16],[26]
Interest rate, cash 9.00% [19],[21],[22],[37] 9.50% [9],[15],[16],[26]
Investment, Identifier [Axis]: Basin Innovation Group, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ (28)  
Fair value at ending balance $ 0 [19],[21],[22],[37] $ (28) [9],[15],[16],[26]
Basis spread on variable rate 4.75% [19],[21],[22],[37] 5.00% [9],[15],[16],[26]
Interest rate, cash 9.00% [19],[21],[22],[37] 9.50% [9],[15],[16],[26]
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 [8],[15],[16],[42] $ 854  
Fair value at ending balance [8],[15],[16],[42]   $ 854
Basis spread on variable rate [8],[15],[16],[42]   5.25%
Interest rate, cash [8],[15],[16],[42]   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 [9],[14],[15],[16] 5,322  
Fair value at ending balance $ 5,282 [19],[21],[22],[27] $ 5,322 [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[21],[22],[27] 4.50% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[21],[22],[27] 9.20% [9],[14],[15],[16]
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 [8],[15],[16],[29] $ 7,088  
Fair value at ending balance $ 8,192 [5],[19],[21],[32] $ 7,088 [8],[15],[16],[29]
Basis spread on variable rate 6.40% [5],[19],[21],[32] 6.40% [8],[15],[16],[29]
Interest rate, cash 8.30% [5],[19],[21],[32] 9.20% [8],[15],[16],[29]
Investment, Identifier [Axis]: Biolam Group, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 851,507  
Investment, Identifier [Axis]: Biolam Group, Convertible Bonds    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 1,586,655  
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 [8],[9],[15],[16],[29],[43] $ 1,406  
Fair value at ending balance $ 1,699 [4],[5],[19],[21],[22],[30],[32] $ 1,406 [8],[9],[15],[16],[29],[43]
Basis spread on variable rate 4.50% [4],[5],[19],[21],[22],[30],[32] 4.25% [8],[9],[15],[16],[29],[43]
Investment, interest rate, paid in kind 12.50% [4],[5],[19],[21],[22],[30],[32] 2.80% [8],[9],[15],[16],[29],[43]
Interest rate, cash [8],[9],[15],[16],[29],[43]   5.50%
Investment, Identifier [Axis]: Biolam Group, Ordinary Shares    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 15,191,001  
Investment, Identifier [Axis]: Biolam Group, Preferred Stock A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 41,692  
Investment, Identifier [Axis]: Biolam Group, Preferred Stock A2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 13,538  
Investment, Identifier [Axis]: Biolam Group, Preferred Stock B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 1,529,216  
Investment, Identifier [Axis]: Biolam Group, Preferred Stock C    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 11,153  
Investment, Identifier [Axis]: Biolam Group, Preferred Stock O1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 1,336,662  
Investment, Identifier [Axis]: Biolam Group, Preferred Stock O2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 134,616  
Investment, Identifier [Axis]: Biolam Group, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 2,600,000  
Investment, Identifier [Axis]: Biolam, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 $ 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 851,507  
Investment, Identifier [Axis]: Biolam, Convertible Bonds    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 1,586,655  
Investment, Identifier [Axis]: Biolam, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 1,258  
Gross Reductions [45] (53)  
Amount of Realized Gain (Loss) 2  
Amount of Unrealized Gain (Loss) 492  
Fair value at ending balance 1,699 0
Amount of Interest or Dividends Credited to Income [46] $ (27)  
Basis spread on variable rate 4.50%  
Investment, interest rate, paid in kind 12.50%  
Investment, Identifier [Axis]: Biolam, Ordinary Shares    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 15,191,001  
Investment, Identifier [Axis]: Biolam, Preferred Stock A    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 41,692  
Investment, Identifier [Axis]: Biolam, Preferred Stock A2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 13,538  
Investment, Identifier [Axis]: Biolam, Preferred Stock B    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 1,529,216  
Investment, Identifier [Axis]: Biolam, Preferred Stock C    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 11,153  
Investment, Identifier [Axis]: Biolam, Preferred Stock O1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 1,336,662  
Investment, Identifier [Axis]: Biolam, Preferred Stock O2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 134,616  
Investment, Identifier [Axis]: Biolam, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 2,600,000  
Investment, Identifier [Axis]: Bishop Street Underwriters, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ 2,854  
Basis spread on variable rate [19],[21],[22],[27] 5.50%  
Interest rate, cash [19],[21],[22],[27] 9.70%  
Investment, Identifier [Axis]: Bishop Street Underwriters, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 287  
Investment owned, balance (in shares) [12],[19] 188,809.2  
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 [49] $ 0 [11],[16],[43],[47],[48] 4,869 [50]
Gross Additions 0 [48],[51] 0 [49],[50],[52]
Gross Reductions 0 [48],[53] 0 [49],[50],[54]
Amount of Realized Gain (Loss) (9,628) [48] 0 [49],[50]
Amount of Unrealized Gain (Loss) 9,628 [48] (4,869) [49],[50]
Fair value at ending balance [48] 0 0 [11],[16],[43],[47],[49]
Amount of Interest or Dividends Credited to Income $ 0 [48],[55] $ 0 [49],[50],[56]
Investment, interest rate, paid in kind 10.00% [48] 10.00% [11],[16],[43],[47],[49]
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 [49] $ 2,744 [11],[15],[16],[26],[43],[47],[48] $ 7,166 [50]
Gross Additions 0 [48],[51] 1,114 [49],[50],[52]
Gross Reductions (610) [48],[53] 0 [49],[50],[54]
Amount of Realized Gain (Loss) (7,481) [48] 0 [49],[50]
Amount of Unrealized Gain (Loss) 5,347 [48] (5,536) [49],[50]
Fair value at ending balance [48] 0 2,744 [11],[15],[16],[26],[43],[47],[49]
Amount of Interest or Dividends Credited to Income [49],[50],[56]   $ 1,028
Amount of Interest or Dividends Credited to Income [48],[55] $ (6)  
Investment, interest rate, paid in kind 14.40% [48] 14.40% [11],[15],[16],[26],[43],[47],[49]
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 [11],[13],[16],[47] $ 0  
Fair value at ending balance [11],[13],[16],[47]   $ 0
Investment owned, balance (in shares) [11],[13],[16],[47]   44.6
Investment, Identifier [Axis]: Black Angus Steakhouses, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [49] 0 $ 0
Gross Additions 0 [51] 0 [49],[52]
Gross Reductions 0 [53] 0 [49],[54]
Amount of Realized Gain (Loss) 0 0 [49]
Amount of Unrealized Gain (Loss) 0 0 [49]
Fair value at ending balance 0 0 [49]
Amount of Interest or Dividends Credited to Income $ 0 [55] $ 0 [49],[56]
Investment owned, balance (in shares) 44.6 44.6 [49]
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 [14],[15],[16] $ 4,081  
Fair value at ending balance $ 4,054 [19],[21],[27] $ 4,081 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[27] 4.75% [14],[15],[16]
Interest rate, cash 8.90% [19],[21],[27] 9.40% [14],[15],[16]
Investment, Identifier [Axis]: Breeze Aviation Group Inc, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 7,496  
Basis spread on variable rate [19],[20],[21] 7.50%  
Interest rate, cash [19],[20],[21] 11.60%  
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 $ 28,014 $ 27,859
Interest rate, cash 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 [16] $ 14,618  
Fair value at ending balance $ 15,716 [19] $ 14,618 [16]
Investment, interest rate, paid in kind 7.00% [19] 7.00% [16]
Investment owned, balance (in shares) 14,618 [19] 14,618 [16]
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 [15],[16],[26] $ 4,657  
Fair value at ending balance $ 5,036 [19],[21],[27] $ 4,657 [15],[16],[26]
Basis spread on variable rate 5.50% [19],[21],[27] 5.50% [15],[16],[26]
Interest rate, cash 9.80% [19],[21],[27] 10.20% [15],[16],[26]
Investment, Identifier [Axis]: BrightSign LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19] $ 1,318  
Investment owned, balance (in shares) [19] 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 [16] $ 1,174  
Fair value at ending balance [16]   $ 1,174
Investment owned, balance (in shares) [16]   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 [9],[15],[16],[26] 1,085  
Fair value at ending balance $ 642 [19],[21],[22],[27] $ 1,085 [9],[15],[16],[26]
Basis spread on variable rate 5.50% [19],[21],[22],[27] 5.50% [9],[15],[16],[26]
Interest rate, cash 9.80% [19],[21],[22],[27] 10.20% [9],[15],[16],[26]
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 [8],[9],[15],[16],[23] $ 386  
Fair value at ending balance $ 2,451 [5],[19],[21],[32] $ 386 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.00% [5],[19],[21],[32] 5.00% [8],[9],[15],[16],[23]
Interest rate, cash 7.10% [5],[19],[21],[32] 8.20% [8],[9],[15],[16],[23]
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 [8],[15],[16],[29] $ 1,720  
Fair value at ending balance [8],[15],[16],[29]   $ 1,720
Basis spread on variable rate [8],[15],[16],[29]   5.00%
Investment, interest rate, paid in kind [8],[15],[16],[29]   0.30%
Interest rate, cash [8],[15],[16],[29]   8.60%
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 $ 430 $ 507
Interest rate, cash 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 [8],[15],[16],[35] $ 14,454  
Fair value at ending balance $ 14,763 [5],[19],[21],[36] $ 14,454 [8],[15],[16],[35]
Basis spread on variable rate 4.00% [5],[19],[21],[36] 7.00% [8],[15],[16],[35]
Investment, interest rate, paid in kind [19],[20],[21] 3.80%  
Interest rate, cash 8.50% [5],[19],[21],[36] 12.70% [8],[15],[16],[35]
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 [5],[19],[21],[22],[36] $ 3,278  
Basis spread on variable rate [5],[19],[21],[22],[36] 4.75%  
Interest rate, cash [5],[19],[21],[22],[36] 8.70%  
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 [11],[14],[15] $ 2,461  
Fair value at ending balance $ 2,726 [10],[20],[21] $ 2,461 [11],[14],[15]
Basis spread on variable rate 6.50% [10],[20],[21] 4.00% [11],[14],[15]
Interest rate, cash 10.70% [10],[20],[21] 8.70% [11],[14],[15]
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 [15],[16],[26] $ 5,716  
Fair value at ending balance $ 5,698 [19],[20],[21] $ 5,716 [15],[16],[26]
Basis spread on variable rate 6.25% [19],[20],[21] 6.00% [15],[16],[26]
Interest rate, cash 10.40% [19],[20],[21] 10.70% [15],[16],[26]
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 [13],[16] $ 450  
Fair value at ending balance $ 414 [12],[19] $ 450 [13],[16]
Investment owned, balance (in shares) 455 [12],[19] 455 [13],[16]
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 [15],[16],[28] $ 4,364  
Fair value at ending balance $ 4,100 [19],[20],[21] $ 4,364 [15],[16],[28]
Basis spread on variable rate 9.00% [19],[20],[21] 9.00% [15],[16],[28]
Interest rate, cash 13.40% [19],[20],[21] 14.20% [15],[16],[28]
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 [14],[15],[16] $ 12,455  
Fair value at ending balance [14],[15],[16]   $ 12,455
Basis spread on variable rate [14],[15],[16]   5.25%
Interest rate, cash [14],[15],[16]   10.10%
Investment, Identifier [Axis]: CAi Software, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] 1,246  
Fair value at ending balance [9],[14],[15],[16]   $ 1,246
Basis spread on variable rate [9],[14],[15],[16]   5.25%
Interest rate, cash [9],[14],[15],[16]   10.10%
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 [9],[14],[15],[16] 5,809  
Fair value at ending balance $ 5,807 [19],[21],[22],[37] $ 5,809 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[22],[37] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.10% [19],[21],[22],[37] 9.80% [9],[14],[15],[16]
Investment, Identifier [Axis]: CCFF Buyer, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 235  
Fair value at ending balance $ 249 [19] $ 235 [16]
Investment owned, balance (in shares) 233 [19] 233 [16]
Investment, Identifier [Axis]: CCFF Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (15)  
Fair value at ending balance $ (10) [19],[21],[22],[37] $ (15) [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[22],[37] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.10% [19],[21],[22],[37] 9.80% [9],[14],[15],[16]
Investment, Identifier [Axis]: CEC Entertainment, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 3,426  
Basis spread on variable rate [19],[20],[21] 6.00%  
Interest rate, cash [19],[20],[21] 10.00%  
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 [14],[15],[16] $ 14,008  
Fair value at ending balance $ 13,552 [19],[20],[21] $ 14,008 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21] 4.50% [14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21] 9.10% [14],[15],[16]
Investment, Identifier [Axis]: CGI Parent, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 1,710  
Fair value at ending balance $ 1,909 [12],[19] $ 1,710 [13],[16]
Investment owned, balance (in shares) 657 [12],[19] 657 [13],[16]
Investment, Identifier [Axis]: CGI Parent, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 0  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 4.50% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21],[22] 9.10% [9],[14],[15],[16]
Investment, Identifier [Axis]: CH Buyer, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 861  
Basis spread on variable rate [19],[20],[21] 6.25%  
Interest rate, cash [19],[20],[21] 10.50%  
Investment, Identifier [Axis]: CH Buyer, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 71  
Investment owned, balance (in shares) [12],[19] 685  
Investment, Identifier [Axis]: CH Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (1)  
Basis spread on variable rate [19],[20],[21],[22] 6.25%  
Interest rate, cash [19],[20],[21],[22] 10.50%  
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 [14],[15],[16] $ 12,140  
Fair value at ending balance $ 14,068 [19],[21],[37] $ 12,140 [14],[15],[16]
Basis spread on variable rate 3.50% [19],[21],[37] 6.00% [14],[15],[16]
Investment, interest rate, paid in kind 2.50% [19],[21],[37] 2.50% [14],[15],[16]
Interest rate, cash 7.60% [19],[21],[37] 7.80% [14],[15],[16]
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 [14],[15],[16] $ 1,523  
Fair value at ending balance [14],[15],[16]   $ 1,523
Basis spread on variable rate [14],[15],[16]   6.00%
Investment, interest rate, paid in kind [14],[15],[16]   2.50%
Interest rate, cash [14],[15],[16]   7.80%
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 [14],[15],[16] 3,381  
Fair value at ending balance $ 4,166 [19],[20],[21] $ 3,381 [14],[15],[16]
Basis spread on variable rate 5.25% [19],[20],[21] 5.25% [14],[15],[16]
Investment, interest rate, paid in kind 0.30% [19],[20],[21] 0.30% [14],[15],[16]
Interest rate, cash 9.60% [19],[20],[21] 9.50% [14],[15],[16]
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 [13],[16] $ 0  
Fair value at ending balance $ 0 [12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 12,634.8 [12],[19] 12,635 [13],[16]
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 [8],[9],[15],[16],[57] $ 2,016  
Fair value at ending balance $ 2,325 [5],[19],[21],[31] $ 2,016 [8],[9],[15],[16],[57]
Basis spread on variable rate 4.75% [5],[19],[21],[31] 4.75% [8],[9],[15],[16],[57]
Interest rate, cash 8.80% [5],[19],[21],[31] 9.50% [8],[9],[15],[16],[57]
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 [14],[15],[16] $ 4,211  
Fair value at ending balance [14],[15],[16]   $ 4,211
Basis spread on variable rate [14],[15],[16]   10.00%
Investment, interest rate, paid in kind [14],[15],[16]   14.70%
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 [13],[16] 695  
Fair value at ending balance $ 1,443 [12],[19] $ 695 [13],[16]
Investment owned, balance (in shares) 21,031 [12],[19] 21,031 [13],[16]
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 11,173  
Basis spread on variable rate [19],[20],[21] 7.86%  
Interest rate, cash [19],[20],[21] 12.20%  
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 [14],[15],[16] $ 2,860  
Fair value at ending balance [14],[15],[16]   $ 2,860
Basis spread on variable rate [14],[15],[16]   10.00%
Investment, interest rate, paid in kind [14],[15],[16]   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 [19],[20],[21] $ 856  
Basis spread on variable rate [19],[20],[21] 7.00%  
Interest rate, cash [19],[20],[21] 11.50%  
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 [19],[20],[21] $ 2,315  
Basis spread on variable rate [19],[20],[21] 10.00%  
Investment, interest rate, paid in kind [19],[20],[21] 14.50%  
Investment, Identifier [Axis]: CTI Foods Holdings Co., LLC, Last In First Out Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 4,696  
Basis spread on variable rate [19],[20],[21] 10.00%  
Investment, interest rate, paid in kind [19],[20],[21] 14.50%  
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 [14],[15],[16] $ 597  
Fair value at ending balance $ 661 [19],[20],[21] $ 597 [14],[15],[16]
Basis spread on variable rate 9.00% [19],[20],[21] 12.00% [14],[15],[16]
Investment, interest rate, paid in kind 13.50% [19],[20],[21] 16.70% [14],[15],[16]
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 [14],[15],[16] $ 2,732  
Fair value at ending balance $ 5,187 [19],[20],[21],[22] $ 2,732 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 5.00% [14],[15],[16]
Interest rate, cash 8.50% [19],[20],[21],[22] 9.80% [14],[15],[16]
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 [16] $ 371  
Fair value at ending balance $ 484 [12],[19] $ 371 [16]
Investment owned, balance (in shares) 161,290.32 [12],[19] 161,290.32 [16]
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 [9],[14],[15],[16] $ 18,833  
Fair value at ending balance $ 14,180 [19],[20],[21],[22] $ 18,833 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21],[22] 9.30% [9],[14],[15],[16]
Investment, Identifier [Axis]: Caldwell & Gregory LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (34)  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ (34) [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21],[22] 9.30% [9],[14],[15],[16]
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 [8],[13],[16] $ 0  
Fair value at ending balance $ 0 [5],[12],[19] $ 0 [8],[13],[16]
Investment owned, balance (in shares) 500,000 [5],[12],[19] 500,000 [8],[13],[16]
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 [8],[13],[16] $ 0  
Fair value at ending balance $ 0 [5],[12],[19] $ 0 [8],[13],[16]
Investment owned, balance (in shares) 74,712.64 [5],[12],[19] 74,712.64 [8],[13],[16]
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 [8],[13],[16] $ 0  
Fair value at ending balance $ 0 [5],[12],[19] $ 0 [8],[13],[16]
Investment owned, balance (in shares) 45,604 [5],[12],[19] 45,604 [8],[13],[16]
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 [8],[13],[16] $ 0  
Fair value at ending balance $ 0 [5],[12],[19] $ 0 [8],[13],[16]
Investment owned, balance (in shares) 14.37 [5],[12],[19] 14.37 [8],[13],[16]
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 [8],[15],[16],[43],[58] $ 360  
Fair value at ending balance $ 228 [5],[19],[21],[30],[59] $ 360 [8],[15],[16],[43],[58]
Basis spread on variable rate 7.00% [5],[19],[21],[30],[59] 7.00% [8],[15],[16],[43],[58]
Investment, interest rate, paid in kind 10.30% [5],[19],[21],[30],[59] 10.30% [8],[15],[16],[43],[58]
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 [8],[9],[16] $ 185  
Fair value at ending balance $ 257 [5],[19],[22] $ 185 [8],[9],[16]
Investment, interest rate, paid in kind 15.00% [5],[19],[22] 15.00% [8],[9],[16]
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 [8],[14],[15],[16] $ 4,236  
Fair value at ending balance [8],[14],[15],[16]   $ 4,236
Basis spread on variable rate [8],[14],[15],[16]   7.64%
Interest rate, cash [8],[14],[15],[16]   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 [8],[13],[16] 682  
Fair value at ending balance [8],[13],[16]   $ 682
Investment owned, balance (in shares) [8],[13],[16]   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 [9],[14],[15],[16] 3,742  
Fair value at ending balance $ 4,543 [19],[20],[21] $ 3,742 [9],[14],[15],[16]
Basis spread on variable rate 6.00% [19],[20],[21] 6.00% [9],[14],[15],[16]
Interest rate, cash 10.30% [19],[20],[21] 10.60% [9],[14],[15],[16]
Investment, Identifier [Axis]: Cascade Residential Services LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[16] $ 312  
Fair value at ending balance $ (5) [19],[20],[21],[22] $ 312 [14],[15],[16]
Basis spread on variable rate 6.00% [19],[20],[21],[22] 6.00% [14],[15],[16]
Interest rate, cash 10.30% [19],[20],[21],[22] 10.60% [14],[15],[16]
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 [8],[16] $ 2,365  
Fair value at ending balance 2,064 [5],[12],[19] $ 2,365 [8],[16]
Investment, Identifier [Axis]: Celebration Bidco, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[16] 11,262  
Fair value at ending balance $ 7,745 [4],[12],[19] $ 11,262 [7],[13],[16]
Investment owned, balance (in shares) 1,243,071 [4],[12],[19] 1,243,071 [7],[13],[16]
Investment, Identifier [Axis]: Celebration Bidco, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [60] $ 11,262 $ 12,177
Gross Additions 0 [44] 0 [60],[61]
Gross Reductions 0 [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) (3,517) (915) [60]
Fair value at ending balance 7,745 11,262 [60]
Amount of Interest or Dividends Credited to Income $ 0 [46] $ 0 [60],[63]
Investment owned, balance (in shares) 1,243,071 1,243,071 [60]
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 [7],[14],[16] $ 6,414  
Fair value at ending balance [7],[14],[16]   $ 6,414
Basis spread on variable rate [7],[14],[16]   8.00%
Investment, interest rate, paid in kind [7],[14],[16]   12.60%
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 [60] 6,414 $ 6,214
Gross Additions [60],[61]   200
Gross Reductions [60],[62]   0
Amount of Realized Gain (Loss) [60]   0
Amount of Unrealized Gain (Loss) [60]   0
Fair value at ending balance [60]   6,414
Amount of Interest or Dividends Credited to Income [60],[63]   $ 837
Basis spread on variable rate [60]   8.00%
Investment, interest rate, paid in kind [60]   12.60%
Investment, Identifier [Axis]: Celebration Bidco, LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 6,414  
Gross Additions [44] 619  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) (281)  
Fair value at ending balance 6,752 [4],[19],[20] $ 6,414
Amount of Interest or Dividends Credited to Income [46] $ 618  
Basis spread on variable rate [4],[19],[20] 8.00%  
Investment, interest rate, paid in kind [4],[19],[20] 12.30%  
Investment, Identifier [Axis]: Celebration Bidco, LLC, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 1,387  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 1,387 [4],[19],[20] 0
Amount of Interest or Dividends Credited to Income [46] $ 111  
Basis spread on variable rate [4],[19],[20] 8.00%  
Investment, interest rate, paid in kind [4],[19],[20] 12.30%  
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 [8],[15],[16],[23] $ 2,996  
Fair value at ending balance [8],[15],[16],[23]   $ 2,996
Basis spread on variable rate [8],[15],[16],[23]   5.25%
Interest rate, cash [8],[15],[16],[23]   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 [5],[19],[21],[24] $ 4,389  
Basis spread on variable rate [5],[19],[21],[24] 5.25%  
Interest rate, cash [5],[19],[21],[24] 7.30%  
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 [5],[19],[21],[24] $ 833  
Basis spread on variable rate [5],[19],[21],[24] 5.25%  
Interest rate, cash [5],[19],[21],[24] 7.30%  
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 [8],[15],[16],[29] $ 3,167  
Fair value at ending balance [8],[15],[16],[29]   $ 3,167
Basis spread on variable rate [8],[15],[16],[29]   6.00%
Interest rate, cash [8],[15],[16],[29]   8.90%
Investment, Identifier [Axis]: Ceres Pharma NV, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[21],[32] $ 3,572  
Basis spread on variable rate [5],[19],[21],[32] 6.00%  
Interest rate, cash [5],[19],[21],[32] 8.10%  
Investment, Identifier [Axis]: Ceres Pharma NV, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[21],[22],[24] $ 399  
Basis spread on variable rate [5],[19],[21],[22],[24] 7.00%  
Interest rate, cash [5],[19],[21],[22],[24] 8.90%  
Investment, Identifier [Axis]: CloudOne Digital Corp., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 12,139  
Basis spread on variable rate [19],[20],[21] 5.25%  
Interest rate, cash [19],[20],[21] 9.50%  
Investment, Identifier [Axis]: CloudOne Digital Corp., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (34)  
Basis spread on variable rate [19],[20],[21],[22] 5.25%  
Interest rate, cash [19],[20],[21],[22] 9.50%  
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 [60] $ 16,852 [7],[13],[16] $ 12,160
Gross Additions 0 [44] 5,551 [60],[61]
Gross Reductions 0 [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) 3,131 (859) [60]
Fair value at ending balance 19,983 [4],[12],[19] 16,852 [7],[13],[16],[60]
Amount of Interest or Dividends Credited to Income $ 0 [46] $ 0 [60],[63]
Investment owned, balance (in shares) 3,518,097 [4],[12],[19] 3,518,097 [7],[13],[16],[60]
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 [60] $ 15,770 [7],[16] $ 15,649
Gross Additions 76 [44] 95 [60],[61]
Gross Reductions 0 [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) 15 26 [60]
Fair value at ending balance 15,861 [4],[19] 15,770 [7],[16],[60]
Amount of Interest or Dividends Credited to Income $ 1,070 [46] $ 1,428 [60],[63]
Interest rate, cash 8.00% [4],[19] 8.00% [7],[16],[60]
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 [60] $ 7,271 [7],[16] $ 6,868
Gross Additions 28 [44] 403 [60],[61]
Gross Reductions 0 [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) 14 0 [60]
Fair value at ending balance 7,313 [4],[19] 7,271 [7],[16],[60]
Amount of Interest or Dividends Credited to Income $ 486 [46] $ 711 [60],[63]
Interest rate, cash 8.00% [4],[19] 8.00% [7],[16],[60]
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 [8],[15],[16],[28] $ 1,303  
Fair value at ending balance $ 1,292 [5],[19],[20],[21] $ 1,303 [8],[15],[16],[28]
Basis spread on variable rate 6.25% [5],[19],[20],[21] 6.25% [8],[15],[16],[28]
Interest rate, cash 10.30% [5],[19],[20],[21] 10.90% [8],[15],[16],[28]
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 [14],[15],[16] $ 3,903  
Fair value at ending balance $ 3,963 [19],[20],[21] $ 3,903 [14],[15],[16]
Basis spread on variable rate 8.00% [19],[20],[21] 8.00% [14],[15],[16]
Interest rate, cash 12.00% [19],[20],[21] 12.60% [14],[15],[16]
Investment, Identifier [Axis]: Coherus Biosciences, Inc., Royalty Rights    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 5,834  
Fair value at ending balance 1,581 [19] $ 5,834 [16]
Investment owned, balance (in shares) [16]   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 [13],[16] 175  
Fair value at ending balance $ 170 [12],[19] $ 175 [13],[16]
Investment owned, balance (in shares) 33,324.7 [12],[19] 33,324.7 [13],[16]
Investment, Identifier [Axis]: Compass Precision, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 299  
Fair value at ending balance $ 344 [12],[19] $ 299 [13],[16]
Investment owned, balance (in shares) 46,085.6 [12],[19] 46,085.6 [13],[16]
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 [16] $ 640  
Fair value at ending balance $ 653 [19] $ 640 [16]
Investment, interest rate, paid in kind 1.00% [19] 1.00% [16]
Interest rate, cash 11.00% [19] 11.00% [16]
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 [15],[16],[26] $ 18,663  
Fair value at ending balance $ 10,811 [19],[20],[21] $ 18,663 [15],[16],[26]
Basis spread on variable rate 5.25% [19],[20],[21] 5.00% [15],[16],[26]
Interest rate, cash 9.70% [19],[20],[21] 9.70% [15],[16],[26]
Investment, Identifier [Axis]: Comply365, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 0  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ 0 [9],[15],[16],[26]
Basis spread on variable rate 5.25% [19],[20],[21],[22] 5.00% [9],[15],[16],[26]
Interest rate, cash 9.70% [19],[20],[21],[22] 9.70% [9],[15],[16],[26]
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 [8],[15],[16],[23] $ 4,822  
Fair value at ending balance [8],[15],[16],[23]   $ 4,822
Basis spread on variable rate [8],[15],[16],[23]   5.15%
Interest rate, cash [8],[15],[16],[23]   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 [5],[19],[21],[24] $ 5,471  
Basis spread on variable rate [5],[19],[21],[24] 5.15%  
Interest rate, cash [5],[19],[21],[24] 7.20%  
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 [8],[13],[16] $ 206  
Fair value at ending balance $ 241 [5],[12],[19] $ 206 [8],[13],[16]
Investment owned, balance (in shares) 440 [5],[12],[19] 440 [8],[13],[16]
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 [8],[13],[16] $ 381  
Fair value at ending balance $ 452 [5],[12],[19] $ 381 [8],[13],[16]
Investment owned, balance (in shares) 191 [5],[12],[19] 191 [8],[13],[16]
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 [8],[9],[15],[16],[23] $ 4,590  
Fair value at ending balance $ 5,337 [5],[19],[21],[22],[32] $ 4,590 [8],[9],[15],[16],[23]
Basis spread on variable rate 6.50% [5],[19],[21],[22],[32] 6.50% [8],[9],[15],[16],[23]
Investment, interest rate, paid in kind 0.30% [5],[19],[21],[22],[32] 0.30% [8],[9],[15],[16],[23]
Interest rate, cash 8.50% [5],[19],[21],[22],[32] 10.10% [8],[9],[15],[16],[23]
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 [19],[20],[21] $ 1,784  
Basis spread on variable rate [19],[20],[21] 4.50%  
Interest rate, cash [19],[20],[21] 8.50%  
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 [12],[19] $ 401  
Investment owned, balance (in shares) [12],[19] 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 [19],[20],[21],[22] $ 240  
Basis spread on variable rate [19],[20],[21],[22] 4.50%  
Interest rate, cash [19],[20],[21],[22] 8.50%  
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 [14],[15],[16] $ 6,950  
Fair value at ending balance $ 6,897 [19],[21],[27] $ 6,950 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[27] 5.00% [14],[15],[16]
Interest rate, cash 9.30% [19],[21],[27] 9.50% [14],[15],[16]
Investment, Identifier [Axis]: DISA Holdings Corp., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 0  
Fair value at ending balance $ 86 [19],[21],[22],[27] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[22],[27] 5.00% [9],[14],[15],[16]
Interest rate, cash 9.30% [19],[21],[22],[27] 9.50% [9],[14],[15],[16]
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 [15],[16],[28] $ 1,871  
Fair value at ending balance [15],[16],[28]   $ 1,871
Basis spread on variable rate [15],[16],[28]   5.50%
Interest rate, cash [15],[16],[28]   10.00%
Investment, Identifier [Axis]: DataServ Integrations, LLC, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] 103  
Fair value at ending balance [13],[16]   $ 103
Investment owned, balance (in shares) [13],[16]   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 [12],[19] $ 193  
Investment owned, balance (in shares) [12],[19] 175,459.2  
Investment, Identifier [Axis]: DataServ Integrations, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[28] $ 0  
Fair value at ending balance [9],[15],[16],[28]   $ 0
Basis spread on variable rate [9],[15],[16],[28]   5.50%
Interest rate, cash [9],[15],[16],[28]   10.00%
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 [8],[15],[16],[35] 818  
Fair value at ending balance $ 871 [5],[19],[21],[36] $ 818 [8],[15],[16],[35]
Basis spread on variable rate 10.00% [5],[19],[21],[36] 10.00% [8],[15],[16],[35]
Interest rate, cash 14.20% [5],[19],[21],[36] 14.70% [8],[15],[16],[35]
Investment, Identifier [Axis]: DecksDirect, LLC, Class A Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 0  
Fair value at ending balance $ 0 [12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 1,016.1 [12],[19] 1,016.1 [13],[16]
Investment, Identifier [Axis]: DecksDirect, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 0  
Fair value at ending balance $ 0 [12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 1,280.8 [12],[19] 1,280.8 [13],[16]
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 [14],[15],[16] $ 1,383  
Fair value at ending balance $ 1,070 [19],[20],[21] $ 1,383 [14],[15],[16]
Basis spread on variable rate 6.25% [19],[20],[21] 6.25% [14],[15],[16]
Investment, interest rate, paid in kind [19],[20],[21] 0.30%  
Interest rate, cash 10.60% [19],[20],[21] 10.90% [14],[15],[16]
Investment, Identifier [Axis]: DecksDirect, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19] $ 0  
Investment, interest rate, paid in kind [19] 13.00%  
Investment owned, balance (in shares) [19] 9.5  
Investment, Identifier [Axis]: DecksDirect, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 301  
Fair value at ending balance $ (14) [19],[20],[21],[22] $ 301 [9],[14],[15],[16]
Basis spread on variable rate 6.50% [19],[20],[21],[22] 6.25% [9],[14],[15],[16]
Interest rate, cash 10.80% [19],[20],[21],[22] 10.90% [9],[14],[15],[16]
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 [19],[20],[21],[22] $ 12,315  
Basis spread on variable rate [19],[20],[21],[22] 5.00%  
Interest rate, cash [19],[20],[21],[22] 9.20%  
Investment, Identifier [Axis]: Discovery Buyer, L.P., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (18)  
Basis spread on variable rate [19],[20],[21],[22] 5.00%  
Interest rate, cash [19],[20],[21],[22] 9.20%  
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 [13],[16] $ 333  
Fair value at ending balance $ 436 [19] $ 333 [13],[16]
Investment owned, balance (in shares) 2,769 [19] 2,769 [13],[16]
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 [16] $ 717  
Fair value at ending balance $ 802 [19] $ 717 [16]
Investment, interest rate, paid in kind 1.50% [19] 1.50% [16]
Interest rate, cash 11.00% [19] 11.00% [16]
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 [8],[15],[16],[23] $ 2,585  
Fair value at ending balance [8],[15],[16],[23]   $ 2,585
Basis spread on variable rate [8],[15],[16],[23]   5.50%
Interest rate, cash [8],[15],[16],[23]   8.60%
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 [8],[15],[16],[23] 2,202  
Fair value at ending balance [8],[15],[16],[23]   $ 2,202
Basis spread on variable rate [8],[15],[16],[23]   5.25%
Interest rate, cash [8],[15],[16],[23]   8.60%
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 [8],[11],[13] 437  
Fair value at ending balance 9 [5],[10],[12] $ 437 [8],[11],[13]
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 [8],[9],[15],[16],[23] 91  
Fair value at ending balance [8],[9],[15],[16],[23]   $ 91
Basis spread on variable rate [8],[9],[15],[16],[23]   4.00%
Interest rate, cash [8],[9],[15],[16],[23]   6.60%
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 [8],[14],[15],[16] 193  
Fair value at ending balance [8],[14],[15],[16]   $ 193
Basis spread on variable rate [8],[14],[15],[16]   4.00%
Interest rate, cash [8],[14],[15],[16]   8.80%
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 [8],[14],[15],[16] 1,164  
Fair value at ending balance [8],[14],[15],[16]   $ 1,164
Basis spread on variable rate [8],[14],[15],[16]   4.00%
Investment, interest rate, paid in kind [8],[14],[15],[16]   2.30%
Interest rate, cash [8],[14],[15],[16]   6.30%
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 [8],[14],[15],[16] 998  
Fair value at ending balance $ 1,000 [5],[19],[20],[21] $ 998 [8],[14],[15],[16]
Basis spread on variable rate 5.25% [5],[19],[20],[21] 5.25% [8],[14],[15],[16]
Interest rate, cash 9.60% [5],[19],[20],[21] 9.90% [8],[14],[15],[16]
Investment, Identifier [Axis]: Durare Bidco, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 1,389  
Basis spread on variable rate [19],[20],[21],[22] 4.75%  
Interest rate, cash [19],[20],[21],[22] 9.00%  
Investment, Identifier [Axis]: Durare Bidco, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (10)  
Basis spread on variable rate [19],[20],[21],[22] 4.75%  
Interest rate, cash [19],[20],[21],[22] 9.00%  
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 [14],[15],[16] $ 14,433  
Fair value at ending balance $ 14,478 [19],[20],[21] $ 14,433 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21] 4.75% [14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21] 9.50% [14],[15],[16]
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 [8],[9],[15],[16],[23] $ 1,971  
Fair value at ending balance $ 2,014 [5],[19],[21],[22],[24] $ 1,971 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.50% [5],[19],[21],[22],[24] 5.50% [8],[9],[15],[16],[23]
Interest rate, cash 7.50% [5],[19],[21],[22],[24] 8.30% [8],[9],[15],[16],[23]
Investment, Identifier [Axis]: EFC International, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 380  
Fair value at ending balance $ 254 [12],[19] $ 380 [13],[16]
Investment owned, balance (in shares) 163.83 [12],[19] 163.83 [13],[16]
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 [16] $ 797  
Fair value at ending balance $ 818 [19] $ 797 [16]
Investment, interest rate, paid in kind 2.50% [19] 2.50% [16]
Interest rate, cash 11.00% [19] 11.00% [16]
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 [14],[15],[16] $ 11,696  
Fair value at ending balance $ 11,147 [19],[20],[21] $ 11,696 [14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21] 5.75% [14],[15],[16]
Interest rate, cash 9.90% [19],[20],[21] 10.50% [14],[15],[16]
Investment, Identifier [Axis]: EMI Porta Holdco LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 543  
Fair value at ending balance $ 546 [19],[21],[22],[27] $ 543 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[21],[22],[27] 5.75% [9],[14],[15],[16]
Interest rate, cash 9.90% [19],[21],[22],[27] 10.50% [9],[14],[15],[16]
Investment, Identifier [Axis]: EZ SMBO Bidco, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19] $ 674  
Investment, interest rate, paid in kind [5],[19] 8.00%  
Investment, Identifier [Axis]: EZ SMBO Bidco, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[21],[59] $ 907  
Basis spread on variable rate [5],[19],[21],[59] 5.00%  
Interest rate, cash [5],[19],[21],[59] 7.80%  
Investment, Identifier [Axis]: EZ SMBO Bidco, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[21],[22],[32] $ 568  
Basis spread on variable rate [5],[19],[21],[22],[32] 5.00%  
Interest rate, cash [5],[19],[21],[22],[32] 7.00%  
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 [13],[16] $ 417  
Fair value at ending balance $ 265 [12],[19] $ 417 [13],[16]
Investment owned, balance (in shares) 530.92 [12],[19] 530.92 [13],[16]
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 [15],[16],[26] $ 9,450  
Fair value at ending balance $ 9,223 [19],[21],[27] $ 9,450 [15],[16],[26]
Basis spread on variable rate 7.25% [19],[21],[27] 7.00% [15],[16],[26]
Interest rate, cash 11.50% [19],[21],[27] 11.70% [15],[16],[26]
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 7,000 $ 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 [60] 136,855 145,799
Gross Additions 22 [44] 66 [60],[61]
Gross Reductions 0 [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) 2,661 (9,010) [60]
Fair value at ending balance 139,538 136,855 [60]
Amount of Interest or Dividends Credited to Income $ 12,321 [46] $ 14,894 [60],[63]
Investment owned, balance (in shares) 89,447,396 89,447,396 [60]
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 [7],[16] $ 136,855  
Fair value at ending balance $ 139,538 [4],[19] $ 136,855 [7],[16]
Investment owned, balance (in shares) 89,447,396 [4],[19] 89,447,396 [7],[16]
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[9],[16],[26] $ 10,091  
Fair value at ending balance $ 7,000 [4],[19],[22],[27] $ 10,091 [7],[9],[16],[26]
Basis spread on variable rate 6.50% [4],[19],[22],[27] 7.25% [7],[9],[16],[26]
Interest rate, cash 10.80% [4],[19],[22],[27] 11.90% [7],[9],[16],[26]
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [60] $ 10,091 $ 5,545
Gross Additions 3,009 [44] 27,656 [60],[61]
Gross Reductions (6,092) [45] (23,091) [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) (8) (19) [60]
Fair value at ending balance 7,000 10,091 [60]
Amount of Interest or Dividends Credited to Income $ 849 [46] $ 817 [60],[63]
Basis spread on variable rate 6.50% 7.25% [60]
Interest rate, cash 10.80% 11.90% [60]
Investment, Identifier [Axis]: Eclipse Business Capital, LLC, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[16] $ 4,545  
Fair value at ending balance $ 4,545 [4],[19] $ 4,545 [7],[16]
Interest rate, cash 7.50% [4],[19] 7.50% [7],[16]
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 [60] $ 4,545 $ 4,545
Gross Additions 5 [44] 6 [60],[61]
Gross Reductions 0 [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) (5) (6) [60]
Fair value at ending balance 4,545 4,545 [60]
Amount of Interest or Dividends Credited to Income $ 264 [46] $ 323 [60],[63]
Interest rate, cash 7.50% 7.50% [60]
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 [16] $ 307  
Fair value at ending balance $ 316 [19] $ 307 [16]
Investment, interest rate, paid in kind 13.50% [19] 3.00% [16]
Interest rate, cash [16]   10.50%
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 [13],[16] $ 188  
Fair value at ending balance $ 306 [12],[19] $ 188 [13],[16]
Investment owned, balance (in shares) 187,500 [12],[19] 187,500 [13],[16]
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 [9],[15],[16],[28] $ 10,410  
Fair value at ending balance [9],[15],[16],[28]   $ 10,410
Basis spread on variable rate [9],[15],[16],[28]   6.50%
Interest rate, cash [9],[15],[16],[28]   11.30%
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 [14],[15],[16] 4,348  
Fair value at ending balance [14],[15],[16]   $ 4,348
Basis spread on variable rate [14],[15],[16]   5.50%
Investment, interest rate, paid in kind [14],[15],[16]   2.00%
Interest rate, cash [14],[15],[16]   8.00%
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 [14],[15],[16] 6,624  
Fair value at ending balance $ 6,294 [19],[20],[21] $ 6,624 [14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21] 5.75% [14],[15],[16]
Interest rate, cash 9.80% [19],[20],[21] 10.40% [14],[15],[16]
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 [8],[15],[16],[29],[43] $ 831  
Fair value at ending balance $ 617 [5],[19],[21],[30],[32] $ 831 [8],[15],[16],[29],[43]
Basis spread on variable rate 7.00% [5],[19],[21],[30],[32] 7.00% [8],[15],[16],[29],[43]
Investment, interest rate, paid in kind 9.40% [5],[19],[21],[30],[32] 9.60% [8],[15],[16],[29],[43]
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 [8],[14],[15],[16],[43] $ 453  
Fair value at ending balance $ 298 [5],[19],[20],[21],[30] $ 453 [8],[14],[15],[16],[43]
Basis spread on variable rate 7.00% [5],[19],[20],[21],[30] 7.00% [8],[14],[15],[16],[43]
Investment, interest rate, paid in kind 12.40% [5],[19],[20],[21],[30] 11.30% [8],[14],[15],[16],[43]
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 [8],[15],[16],[35],[43] $ 1,165  
Fair value at ending balance $ 938 [5],[19],[21],[30],[36] $ 1,165 [8],[15],[16],[35],[43]
Basis spread on variable rate 7.00% [5],[19],[21],[30],[36] 7.00% [8],[15],[16],[35],[43]
Investment, interest rate, paid in kind 12.40% [5],[19],[21],[30],[36] 11.50% [8],[15],[16],[35],[43]
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 [8],[16],[43] $ 0  
Fair value at ending balance $ 0 [5],[19],[30] $ 0 [8],[16],[43]
Investment, interest rate, paid in kind 11.50% [5],[19],[30] 11.50% [8],[16],[43]
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 [8],[9],[15],[16],[38] $ 1,336  
Fair value at ending balance $ 1,426 [5],[19],[21],[22],[39] $ 1,336 [8],[9],[15],[16],[38]
Basis spread on variable rate 6.50% [5],[19],[21],[22],[39] 6.50% [8],[9],[15],[16],[38]
Interest rate, cash 10.20% [5],[19],[21],[22],[39] 11.00% [8],[9],[15],[16],[38]
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 [19],[20],[21],[22] $ 1,071  
Basis spread on variable rate [19],[20],[21],[22] 4.25%  
Interest rate, cash [19],[20],[21],[22] 8.10%  
Investment, Identifier [Axis]: Expert Institute Group Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (6)  
Basis spread on variable rate [19],[20],[21],[22] 4.25%  
Interest rate, cash [19],[20],[21],[22] 8.10%  
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 [14],[15],[16] $ 5,955  
Fair value at ending balance $ 3,256 [19],[20],[21] $ 5,955 [14],[15],[16]
Basis spread on variable rate 6.25% [19],[20],[21] 6.50% [14],[15],[16]
Interest rate, cash 10.60% [19],[20],[21] 11.40% [14],[15],[16]
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 [9],[14],[15],[16] $ 124  
Fair value at ending balance $ (1) [19],[20],[21],[22] $ 124 [9],[14],[15],[16]
Basis spread on variable rate 6.25% [19],[20],[21],[22] 6.50% [9],[14],[15],[16]
Interest rate, cash 10.60% [19],[20],[21],[22] 11.40% [9],[14],[15],[16]
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 [14],[15],[16] $ 11,950  
Fair value at ending balance $ 11,938 [19],[21],[27] $ 11,950 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[21],[27] 4.50% [14],[15],[16]
Interest rate, cash 8.60% [19],[21],[27] 9.10% [14],[15],[16]
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 [15],[16],[26] $ 4,740  
Fair value at ending balance $ 9,360 [19],[21],[27] $ 4,740 [15],[16],[26]
Basis spread on variable rate 4.50% [19],[21],[27] 5.00% [15],[16],[26]
Interest rate, cash 8.70% [19],[21],[27] 9.60% [15],[16],[26]
Investment, Identifier [Axis]: FSS Buyer LLC, LP Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 17  
Fair value at ending balance $ 17 [12],[19] $ 17 [16]
Investment owned, balance (in shares) 1,160.9 [12],[19] 1,160.9 [16]
Investment, Identifier [Axis]: FSS Buyer LLC, LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 74  
Fair value at ending balance $ 76 [12],[19] $ 74 [13],[16]
Investment owned, balance (in shares) 5,104.3 [12],[19] 5,104.3 [13],[16]
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 [8],[9],[15],[16],[23] $ 1,552  
Fair value at ending balance $ 1,784 [5],[19],[21],[24] $ 1,552 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.85% [5],[19],[21],[24] 6.25% [8],[9],[15],[16],[23]
Interest rate, cash 7.90% [5],[19],[21],[24] 9.60% [8],[9],[15],[16],[23]
Investment, Identifier [Axis]: Featherstone Bidco Limited, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[21],[34] $ 2,268  
Basis spread on variable rate [5],[19],[21],[34] 6.00%  
Interest rate, cash [5],[19],[21],[34] 9.80%  
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 [16] $ 2,799  
Fair value at ending balance $ 2,886 [19] $ 2,799 [16]
Investment owned, balance (in shares) 2,886 [19] 2,886 [16]
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 [16] $ 5,608  
Fair value at ending balance $ 6,706 [19] $ 5,608 [16]
Investment, interest rate, paid in kind 11.00% [19] 11.00% [16]
Investment owned, balance (in shares) 6,582.7 [19] 6,582.7 [16]
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 [8],[15],[16],[29] $ 3,872  
Fair value at ending balance $ 4,359 [5],[19],[21],[32] $ 3,872 [8],[15],[16],[29]
Basis spread on variable rate 4.50% [5],[19],[21],[32] 6.25% [8],[15],[16],[29]
Interest rate, cash 6.50% [5],[19],[21],[32] 9.30% [8],[15],[16],[29]
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 [8],[15],[16],[29] $ 4,613  
Fair value at ending balance $ 4,907 [5],[19],[21],[32] $ 4,613 [8],[15],[16],[29]
Basis spread on variable rate 4.00% [5],[19],[21],[32] 6.50% [8],[15],[16],[29]
Investment, interest rate, paid in kind [5],[19],[21],[32] 3.30%  
Interest rate, cash 6.00% [5],[19],[21],[32] 10.20% [8],[15],[16],[29]
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 [15],[16],[26] $ 4,128  
Fair value at ending balance $ 3,994 [19],[21],[27] $ 4,128 [15],[16],[26]
Basis spread on variable rate 4.50% [19],[21],[27] 4.75% [15],[16],[26]
Interest rate, cash 8.80% [19],[21],[27] 9.40% [15],[16],[26]
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 [13],[16] $ 564  
Fair value at ending balance $ 755 [12],[19] $ 564 [13],[16]
Investment owned, balance (in shares) 966.99 [12],[19] 966.99 [13],[16]
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 [14],[15],[16] $ 13,198  
Fair value at ending balance $ 13,692 [19],[20],[21] $ 13,198 [14],[15],[16]
Basis spread on variable rate 7.25% [19],[20],[21] 7.25% [14],[15],[16]
Interest rate, cash 11.40% [19],[20],[21] 11.80% [14],[15],[16]
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   $ 15,339
Interest rate, cash   6.90%
Investment, Identifier [Axis]: Flywheel Holdings Segregated Portfolio 2025-2, LP Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[12],[19] $ 2,805  
Investment owned, balance (in shares) [5],[12],[19] 2,777,264  
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 [8],[13],[16] $ 3,875  
Fair value at ending balance $ 2,687 [5],[19] $ 3,875 [8],[13],[16]
Investment owned, balance (in shares) 2,828,286 [5],[19] 2,828,286 [8],[13],[16]
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 [8],[15],[16],[23] $ 217  
Fair value at ending balance $ 246 [5],[19],[21],[24] $ 217 [8],[15],[16],[23]
Basis spread on variable rate 6.50% [5],[19],[21],[24] 6.50% [8],[15],[16],[23]
Interest rate, cash 8.50% [5],[19],[21],[24] 10.20% [8],[15],[16],[23]
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 [8],[9],[15],[16],[33] $ 1,588  
Fair value at ending balance $ 1,709 [5],[19],[21],[34] $ 1,588 [8],[9],[15],[16],[33]
Basis spread on variable rate 6.50% [5],[19],[21],[34] 6.50% [8],[9],[15],[16],[33]
Interest rate, cash 10.90% [5],[19],[21],[34] 11.50% [8],[9],[15],[16],[33]
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 [13],[16] $ 130  
Fair value at ending balance $ 137 [19] $ 130 [13],[16]
Investment owned, balance (in shares) 122 [19] 122 [13],[16]
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 [13],[16] $ 124  
Fair value at ending balance $ 66 [12],[19] $ 124 [13],[16]
Investment owned, balance (in shares) 122 [12],[19] 122 [13],[16]
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 [14],[15],[16] $ 6,091  
Fair value at ending balance $ 6,031 [19],[20],[21] $ 6,091 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21] 5.00% [14],[15],[16]
Interest rate, cash 9.00% [19],[20],[21] 9.60% [14],[15],[16]
Investment, Identifier [Axis]: Forest Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (2)  
Fair value at ending balance $ (3) [19],[20],[21],[22] $ (2) [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 9.00% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
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 [9],[14],[15],[16] $ 8,815  
Fair value at ending balance [9],[14],[15],[16]   $ 8,815
Basis spread on variable rate [9],[14],[15],[16]   5.25%
Interest rate, cash [9],[14],[15],[16]   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 [9],[14],[15],[16] (9)  
Fair value at ending balance [9],[14],[15],[16]   $ (9)
Basis spread on variable rate [9],[14],[15],[16]   5.25%
Interest rate, cash [9],[14],[15],[16]   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 [14],[15],[16] 4,544  
Fair value at ending balance $ 4,508 [19],[20],[21] $ 4,544 [14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21] 5.75% [14],[15],[16]
Interest rate, cash 10.20% [19],[20],[21] 10.50% [14],[15],[16]
Investment, Identifier [Axis]: FragilePak LLC, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 767  
Fair value at ending balance $ 735 [12],[19] $ 767 [13],[16]
Investment owned, balance (in shares) 937.5 [12],[19] 937.5 [13],[16]
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 [9],[14],[15],[16] $ 9,129  
Fair value at ending balance $ 6,173 [19],[20],[21],[22] $ 9,129 [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 6.25% [9],[14],[15],[16]
Interest rate, cash 8.50% [19],[20],[21],[22] 10.90% [9],[14],[15],[16]
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 [16] $ 1,350  
Fair value at ending balance $ 1,512 [19] $ 1,350 [16]
Investment owned, balance (in shares) 687 [19] 687 [16]
Investment, Identifier [Axis]: GB Eagle Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (23)  
Fair value at ending balance $ 868 [19],[20],[21],[22] $ (23) [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 6.25% [9],[14],[15],[16]
Interest rate, cash 8.50% [19],[20],[21],[22] 10.90% [9],[14],[15],[16]
Investment, Identifier [Axis]: GCDL LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 243  
Fair value at ending balance $ 355 [19] $ 243 [13],[16]
Investment owned, balance (in shares) 243,243.24 [19] 243,243.24 [13],[16]
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 [9],[14],[15],[16] $ 529  
Fair value at ending balance $ 503 [19],[20],[21],[22] $ 529 [9],[14],[15],[16]
Basis spread on variable rate 6.00% [19],[20],[21],[22] 6.00% [9],[14],[15],[16]
Interest rate, cash 10.00% [19],[20],[21],[22] 10.40% [9],[14],[15],[16]
Investment, Identifier [Axis]: GCDL LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (2)  
Fair value at ending balance $ (1) [19],[20],[21],[22] $ (2) [9],[14],[15],[16]
Basis spread on variable rate 6.00% [19],[20],[21],[22] 6.00% [9],[14],[15],[16]
Interest rate, cash 10.00% [19],[20],[21],[22] 10.40% [9],[14],[15],[16]
Investment, Identifier [Axis]: GMES LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 7,617  
Basis spread on variable rate [19],[20],[21],[22] 5.25%  
Interest rate, cash [19],[20],[21],[22] 9.40%  
Investment, Identifier [Axis]: GMES LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (13)  
Basis spread on variable rate [19],[20],[21],[22] 5.25%  
Interest rate, cash [19],[20],[21],[22] 9.40%  
Investment, Identifier [Axis]: GPNZ II GmbH, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[13],[16] $ 0  
Fair value at ending balance $ 0 [5],[12],[19] $ 0 [8],[13],[16]
Investment owned, balance (in shares) 5,785 [5],[12],[19] 5,785 [8],[13],[16]
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 [8],[16] $ 271  
Fair value at ending balance $ 214 [5],[19],[22] $ 271 [8],[16]
Investment, interest rate, paid in kind 10.00% [5],[19],[22] 10.00% [8],[16]
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 [8],[9],[15],[16] $ 33  
Fair value at ending balance $ 62 [5],[19] $ 33 [8],[9],[15],[16]
Investment, interest rate, paid in kind 10.00% [5],[19] 10.00% [8],[9],[15],[16]
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 [8],[15],[16],[40],[43] $ 189  
Fair value at ending balance $ 0 [5],[19],[21],[30],[41] $ 189 [8],[15],[16],[40],[43]
Basis spread on variable rate 6.00% [5],[19],[21],[30],[41] 6.00% [8],[15],[16],[40],[43]
Investment, interest rate, paid in kind [5],[19],[21],[30],[41] 9.90%  
Interest rate, cash [8],[15],[16],[40],[43]   8.70%
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 [8],[15],[16],[38] $ 2,284  
Fair value at ending balance $ 2,680 [5],[19],[21],[39] $ 2,284 [8],[15],[16],[38]
Basis spread on variable rate 4.91% [5],[19],[21],[39] 5.50% [8],[15],[16],[38]
Interest rate, cash 8.70% [5],[19],[21],[39] 9.30% [8],[15],[16],[38]
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 [8],[9],[15],[16],[64] $ 4,000  
Fair value at ending balance $ 4,146 [5],[19],[21],[22],[65] $ 4,000 [8],[9],[15],[16],[64]
Basis spread on variable rate 4.91% [5],[19],[21],[22],[65] 5.50% [8],[9],[15],[16],[64]
Interest rate, cash 8.20% [5],[19],[21],[22],[65] 9.30% [8],[9],[15],[16],[64]
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 [14],[15],[16] $ 12,883  
Fair value at ending balance $ 12,677 [19],[21],[27] $ 12,883 [14],[15],[16]
Basis spread on variable rate 8.75% [19],[21],[27] 9.50% [14],[15],[16]
Investment, interest rate, paid in kind [14],[15],[16]   4.50%
Interest rate, cash 12.90% [19],[21],[27] 9.80% [14],[15],[16]
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 [9],[14],[15],[16] $ 9,499  
Fair value at ending balance [9],[14],[15],[16]   $ 9,499
Basis spread on variable rate [9],[14],[15],[16]   4.75%
Interest rate, cash [9],[14],[15],[16]   9.40%
Investment, Identifier [Axis]: Graphpad Software, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] (1)  
Fair value at ending balance [9],[14],[15],[16]   $ (1)
Basis spread on variable rate [9],[14],[15],[16]   4.75%
Interest rate, cash [9],[14],[15],[16]   9.40%
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 [8],[9],[15],[16],[23] 936  
Fair value at ending balance $ 1,763 [5],[19],[21],[22],[24] $ 936 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.10% [5],[19],[21],[22],[24] 5.10% [8],[9],[15],[16],[23]
Interest rate, cash 7.10% [5],[19],[21],[22],[24] 8.30% [8],[9],[15],[16],[23]
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 [8],[15],[16],[29] $ 4,747  
Fair value at ending balance $ 5,424 [5],[19],[21],[32] $ 4,747 [8],[15],[16],[29]
Basis spread on variable rate 6.50% [5],[19],[21],[32] 6.25% [8],[15],[16],[29]
Interest rate, cash 8.30% [5],[19],[21],[32] 9.40% [8],[15],[16],[29]
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 [8],[9],[15],[16],[23] $ 871  
Fair value at ending balance $ 496 [5],[19],[21],[22],[24] $ 871 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.75% [5],[19],[21],[22],[24] 5.45% [8],[9],[15],[16],[23]
Interest rate, cash 7.50% [5],[19],[21],[22],[24] 8.50% [8],[9],[15],[16],[23]
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 [8],[9],[15],[16],[23] $ 4,850  
Fair value at ending balance $ 5,504 [5],[19],[21],[22],[24] $ 4,850 [8],[9],[15],[16],[23]
Basis spread on variable rate 6.20% [5],[19],[21],[22],[24] 6.25% [8],[9],[15],[16],[23]
Interest rate, cash 8.20% [5],[19],[21],[22],[24] 9.60% [8],[9],[15],[16],[23]
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 [19],[20],[21],[22] $ 1,492  
Basis spread on variable rate [19],[20],[21],[22] 4.50%  
Interest rate, cash [19],[20],[21],[22] 8.50%  
Investment, Identifier [Axis]: HS Advisory Buyer LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (8)  
Basis spread on variable rate [19],[20],[21],[22] 4.50%  
Interest rate, cash [19],[20],[21],[22] 8.50%  
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 [5],[19],[21],[22],[34] $ 2,674  
Basis spread on variable rate [5],[19],[21],[22],[34] 5.25%  
Interest rate, cash [5],[19],[21],[22],[34] 9.20%  
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 [9],[14],[15],[16] $ 10,421  
Fair value at ending balance $ 10,342 [19],[20],[21],[22] $ 10,421 [9],[14],[15],[16]
Basis spread on variable rate 8.50% [19],[20],[21],[22] 8.50% [9],[14],[15],[16]
Interest rate, cash 12.90% [19],[20],[21],[22] 13.50% [9],[14],[15],[16]
Investment, Identifier [Axis]: HTI Technology & Industries, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (70)  
Fair value at ending balance $ (78) [19],[20],[21],[22] $ (70) [9],[14],[15],[16]
Basis spread on variable rate 8.50% [19],[20],[21],[22] 8.50% [9],[14],[15],[16]
Interest rate, cash 12.90% [19],[20],[21],[22] 13.50% [9],[14],[15],[16]
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 [14],[15],[16] $ 11,081  
Fair value at ending balance $ 10,190 [19],[20],[21] $ 11,081 [14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21] 5.75% [14],[15],[16]
Interest rate, cash 10.20% [19],[20],[21] 10.60% [14],[15],[16]
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 [19],[21],[22],[37] $ 6,581  
Basis spread on variable rate [19],[21],[22],[37] 4.75%  
Interest rate, cash [19],[21],[22],[37] 9.10%  
Investment, Identifier [Axis]: Haystack Holdings LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[37] $ (1)  
Basis spread on variable rate [19],[21],[22],[37] 4.75%  
Interest rate, cash [19],[21],[22],[37] 9.10%  
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 [8],[15],[16],[38] $ 602  
Fair value at ending balance $ 700 [5],[19],[21],[22],[39] $ 602 [8],[15],[16],[38]
Basis spread on variable rate 5.25% [5],[19],[21],[22],[39] 5.25% [8],[15],[16],[38]
Interest rate, cash 8.90% [5],[19],[21],[22],[39] 9.70% [8],[15],[16],[38]
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 [16] $ 12,865  
Fair value at ending balance $ 14,167 [19] $ 12,865 [16]
Investment, interest rate, paid in kind 11.00% [19] 11.00% [16]
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 [14],[15],[16] $ 7,221  
Fair value at ending balance $ 7,166 [19],[20],[21] $ 7,221 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21] 5.50% [14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21] 10.10% [14],[15],[16]
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 [9],[14],[15],[16] $ 0  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 5.50% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21],[22] 10.10% [9],[14],[15],[16]
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 [8],[15],[16],[29] $ 3,042  
Fair value at ending balance $ 3,541 [5],[19],[21],[32] $ 3,042 [8],[15],[16],[29]
Basis spread on variable rate 5.75% [5],[19],[21],[32] 5.75% [8],[15],[16],[29]
Interest rate, cash 7.80% [5],[19],[21],[32] 9.30% [8],[15],[16],[29]
Investment, Identifier [Axis]: HemaSource, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 124  
Fair value at ending balance $ 133 [12],[19] $ 124 [13],[16]
Investment owned, balance (in shares) 101,080 [12],[19] 101,080 [13],[16]
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 [15],[16],[26] $ 7,267  
Fair value at ending balance $ 6,699 [19],[21],[27] $ 7,267 [15],[16],[26]
Basis spread on variable rate 4.75% [19],[21],[27] 4.75% [15],[16],[26]
Interest rate, cash 8.90% [19],[21],[27] 9.30% [15],[16],[26]
Investment, Identifier [Axis]: HemaSource, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 0  
Fair value at ending balance $ 0 [19],[21],[22],[27] $ 0 [9],[15],[16],[26]
Basis spread on variable rate 4.75% [19],[21],[22],[27] 4.75% [9],[15],[16],[26]
Interest rate, cash 8.90% [19],[21],[22],[27] 9.30% [9],[15],[16],[26]
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 [8],[15],[26] $ 3,294  
Fair value at ending balance $ 3,252 [5],[21],[27] $ 3,294 [8],[15],[26]
Basis spread on variable rate 6.75% [5],[21],[27] 6.75% [8],[15],[26]
Interest rate, cash 10.90% [5],[21],[27] 12.10% [8],[15],[26]
Investment, Identifier [Axis]: High Street Buyer Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 185  
Basis spread on variable rate [19],[20],[21],[22] 4.50%  
Interest rate, cash [19],[20],[21],[22] 8.50%  
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 [14],[15],[16] $ 3,524  
Fair value at ending balance $ 3,240 [19],[20],[21] $ 3,524 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21] 5.00% [14],[15],[16]
Investment, interest rate, paid in kind [19],[20],[21] 1.00%  
Interest rate, cash 9.40% [19],[20],[21] 9.50% [14],[15],[16]
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 [9],[14],[15],[16] $ 1,477  
Fair value at ending balance $ 1,710 [19],[20],[21],[22] $ 1,477 [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 4.50% [9],[14],[15],[16]
Interest rate, cash 8.70% [19],[20],[21],[22] 9.10% [9],[14],[15],[16]
Investment, Identifier [Axis]: HomeX Services Group LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (3)  
Fair value at ending balance $ 34 [19],[20],[21],[22] $ (3) [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 4.50% [9],[14],[15],[16]
Interest rate, cash 8.70% [19],[20],[21],[22] 9.10% [9],[14],[15],[16]
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 [8],[15],[16],[28] $ 6,645  
Fair value at ending balance $ 6,667 [5],[19],[21],[37] $ 6,645 [8],[15],[16],[28]
Basis spread on variable rate 4.85% [5],[19],[21],[37] 5.00% [8],[15],[16],[28]
Interest rate, cash 9.10% [5],[19],[21],[37] 10.30% [8],[15],[16],[28]
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 [9],[14],[15],[16] $ 7,413  
Fair value at ending balance $ 8,948 [19],[20],[21],[22] $ 7,413 [9],[14],[15],[16]
Basis spread on variable rate 5.25% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 9.30% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
Investment, Identifier [Axis]: Hydratech Holdings, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 265  
Fair value at ending balance $ 511 [19],[20],[21],[22] $ 265 [9],[14],[15],[16]
Basis spread on variable rate 5.25% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 9.30% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
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 [8],[15],[16],[29] $ 1,502  
Fair value at ending balance [8],[15],[16],[29]   $ 1,502
Basis spread on variable rate [8],[15],[16],[29]   5.63%
Interest rate, cash [8],[15],[16],[29]   8.80%
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 [60] 0 $ 2,013
Gross Additions [60],[61]   0
Gross Reductions [60],[62]   (1,040)
Amount of Realized Gain (Loss) [60]   (4,179)
Amount of Unrealized Gain (Loss) [60]   3,206
Fair value at ending balance [60]   0
Amount of Interest or Dividends Credited to Income [60],[63]   $ 0
Investment owned, balance (in shares) [60]   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 [60] 0 $ 3,917
Gross Additions [60],[61]   172
Gross Reductions [60],[62]   (3,917)
Amount of Realized Gain (Loss) [60]   0
Amount of Unrealized Gain (Loss) [60]   (172)
Fair value at ending balance [60]   0
Amount of Interest or Dividends Credited to Income [60],[63]   $ 311
Basis spread on variable rate [60]   8.00%
Interest rate, cash [60]   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 [60] 0 $ 4,519
Gross Additions [60],[61]   161
Gross Reductions [60],[62]   (4,680)
Amount of Realized Gain (Loss) [60]   0
Amount of Unrealized Gain (Loss) [60]   0
Fair value at ending balance [60]   0
Amount of Interest or Dividends Credited to Income [60],[63]   $ 181
Basis spread on variable rate [60]   3.00%
Interest rate, cash [60]   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 [19] $ 10,633  
Investment, interest rate, paid in kind [19] 7.50%  
Investment owned, balance (in shares) [19] 59,462.7  
Interest rate, cash [19] 10.00%  
Investment, Identifier [Axis]: ICREDITWORKS LLC, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 0  
Investment owned, balance (in shares) [12],[19] 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 [8],[15],[16],[23] $ 2,533  
Fair value at ending balance $ 2,894 [5],[19],[21],[24] $ 2,533 [8],[15],[16],[23]
Basis spread on variable rate 5.55% [5],[19],[21],[24] 5.50% [8],[15],[16],[23]
Interest rate, cash 7.60% [5],[19],[21],[24] 8.80% [8],[15],[16],[23]
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 [15],[16],[28] $ 6,706  
Fair value at ending balance [15],[16],[28]   $ 6,706
Basis spread on variable rate [15],[16],[28]   5.00%
Interest rate, cash [15],[16],[28]   9.60%
Investment, Identifier [Axis]: ISTO Technologies II, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[28] (2)  
Fair value at ending balance [9],[15],[16],[28]   $ (2)
Basis spread on variable rate [9],[15],[16],[28]   5.00%
Interest rate, cash [9],[15],[16],[28]   9.60%
Investment, Identifier [Axis]: ITI Intermodal, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] 915  
Fair value at ending balance $ 984 [12],[19] $ 915 [13],[16]
Investment owned, balance (in shares) 7,500.4 [12],[19] 7,500.4 [13],[16]
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 [15],[16],[28] $ 800  
Fair value at ending balance $ 795 [19],[20],[21] $ 800 [15],[16],[28]
Basis spread on variable rate 6.00% [19],[20],[21] 6.25% [15],[16],[28]
Interest rate, cash 10.10% [19],[20],[21] 10.60% [15],[16],[28]
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 [15],[16],[28] $ 12,079  
Fair value at ending balance $ 11,986 [19],[20],[21] $ 12,079 [15],[16],[28]
Basis spread on variable rate 6.25% [19],[20],[21] 6.50% [15],[16],[28]
Interest rate, cash 10.40% [19],[20],[21] 10.80% [15],[16],[28]
Investment, Identifier [Axis]: ITI Intermodal, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[28] $ 225  
Fair value at ending balance $ 226 [19],[20],[21],[22] $ 225 [9],[15],[16],[28]
Basis spread on variable rate 6.25% [19],[20],[21],[22] 6.50% [9],[15],[16],[28]
Interest rate, cash 10.40% [19],[20],[21],[22] 10.80% [9],[15],[16],[28]
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 [9],[14],[15],[16] $ 4,482  
Fair value at ending balance $ 4,388 [19],[20],[21],[22] $ 4,482 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.50% [9],[14],[15],[16]
Interest rate, cash 9.80% [19],[20],[21],[22] 10.10% [9],[14],[15],[16]
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 [13],[16] $ 316  
Fair value at ending balance $ 226 [12],[19] $ 316 [13],[16]
Investment owned, balance (in shares) 2,893 [12],[19] 2,833 [13],[16]
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 [9],[14],[15],[16] $ 186  
Fair value at ending balance $ 372 [19],[20],[21],[22] $ 186 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.50% [9],[14],[15],[16]
Interest rate, cash 9.80% [19],[20],[21],[22] 10.10% [9],[14],[15],[16]
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 [8],[15],[16],[29] $ 2,721  
Fair value at ending balance $ 3,088 [5],[19],[21],[24] $ 2,721 [8],[15],[16],[29]
Basis spread on variable rate 4.75% [5],[19],[21],[24] 4.75% [8],[15],[16],[29]
Interest rate, cash 6.80% [5],[19],[21],[24] 8.10% [8],[15],[16],[29]
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 [8],[15],[16],[29] $ 6,383  
Fair value at ending balance $ 7,243 [5],[19],[21],[24] $ 6,383 [8],[15],[16],[29]
Basis spread on variable rate 4.75% [5],[19],[21],[24] 5.00% [8],[15],[16],[29]
Interest rate, cash 6.80% [5],[19],[21],[24] 8.70% [8],[15],[16],[29]
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 [8],[15],[16],[66] $ 1,012  
Fair value at ending balance $ 1,152 [5],[19],[21],[67] $ 1,012 [8],[15],[16],[66]
Basis spread on variable rate 4.75% [5],[19],[21],[67] 5.00% [8],[15],[16],[66]
Interest rate, cash 4.80% [5],[19],[21],[67] 6.00% [8],[15],[16],[66]
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 [11],[14],[15] $ 2,746  
Fair value at ending balance [11],[14],[15]   $ 2,746
Basis spread on variable rate [11],[14],[15]   4.25%
Interest rate, cash [11],[14],[15]   9.00%
Investment, Identifier [Axis]: International Fleet Financing No.2 B.V., Class C Senior Secured Note    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[22] $ 8,769  
Interest rate, cash [5],[19],[22] 10.50%  
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 [8],[9],[15],[16],[23] $ 1,509  
Fair value at ending balance $ 1,729 [5],[19],[21],[22],[24] $ 1,509 [8],[9],[15],[16],[23]
Basis spread on variable rate 6.25% [5],[19],[21],[22],[24] 6.00% [8],[9],[15],[16],[23]
Interest rate, cash 8.30% [5],[19],[21],[22],[24] 9.60% [8],[9],[15],[16],[23]
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 [8],[9],[15],[16],[38] $ 1,963  
Fair value at ending balance $ 2,146 [5],[19],[21],[22],[39] $ 1,963 [8],[9],[15],[16],[38]
Basis spread on variable rate 6.25% [5],[19],[21],[22],[39] 6.25% [8],[9],[15],[16],[38]
Interest rate, cash 9.80% [5],[19],[21],[22],[39] 10.70% [8],[9],[15],[16],[38]
Investment, Identifier [Axis]: Isagenix International, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [11],[13],[16] $ 0  
Fair value at ending balance [11],[13],[16]   $ 0
Investment owned, balance (in shares) [11],[13],[16]   58,538
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 [11],[14],[15],[16] 160  
Fair value at ending balance [11],[14],[15],[16]   $ 160
Basis spread on variable rate [11],[14],[15],[16]   6.50%
Interest rate, cash [11],[14],[15],[16]   11.20%
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 [8],[15],[16],[23] 5,075  
Fair value at ending balance $ 5,786 [5],[19],[21],[24] $ 5,075 [8],[15],[16],[23]
Basis spread on variable rate 5.25% [5],[19],[21],[24] 6.00% [8],[15],[16],[23]
Interest rate, cash 7.30% [5],[19],[21],[24] 9.20% [8],[15],[16],[23]
Investment, Identifier [Axis]: Ivanti Software Inc, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[20],[21] $ 937  
Basis spread on variable rate [10],[20],[21] 5.75%  
Interest rate, cash [10],[20],[21] 9.90%  
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 ending balance [10],[20],[21] $ 2,613  
Basis spread on variable rate [10],[20],[21] 7.25%  
Interest rate, cash [10],[20],[21] 11.50%  
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 [11],[14],[15] $ 3,285  
Fair value at ending balance [11],[14],[15]   $ 3,285
Basis spread on variable rate [11],[14],[15]   7.25%
Interest rate, cash [11],[14],[15]   12.10%
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 [14],[15],[16] 3,736  
Fair value at ending balance [14],[15],[16]   $ 3,736
Basis spread on variable rate [14],[15],[16]   5.50%
Interest rate, cash [14],[15],[16]   10.20%
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 [8],[15],[16],[29] 1,112  
Fair value at ending balance $ 1,264 [5],[19],[21],[32] $ 1,112 [8],[15],[16],[29]
Basis spread on variable rate 5.25% [5],[19],[21],[32] 5.25% [8],[15],[16],[29]
Interest rate, cash 7.30% [5],[19],[21],[32] 7.90% [8],[15],[16],[29]
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 [8],[15],[16],[28] $ 6,579  
Fair value at ending balance $ 6,526 [5],[19],[21],[37] $ 6,579 [8],[15],[16],[28]
Basis spread on variable rate 5.25% [5],[19],[21],[37] 5.25% [8],[15],[16],[28]
Interest rate, cash 9.60% [5],[19],[21],[37] 9.80% [8],[15],[16],[28]
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   $ 2,520
Interest rate, cash   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 [6],[7],[8],[9] 40,761  
Fair value at ending balance [6],[7],[8],[9]   $ 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 [44] 0 [61]
Gross Reductions 0 [45] 0 [62]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (1,923) (292)
Fair value at ending balance 38,838 [3],[4],[5] 40,761
Amount of Interest or Dividends Credited to Income 4,282 [46] 5,709 [63]
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 [8],[9],[15],[16],[64] 3,720  
Fair value at ending balance $ 4,023 [5],[19],[21],[22],[65] $ 3,720 [8],[9],[15],[16],[64]
Basis spread on variable rate 4.25% [5],[19],[21],[22],[65] 4.50% [8],[9],[15],[16],[64]
Interest rate, cash 7.10% [5],[19],[21],[22],[65] 9.50% [8],[9],[15],[16],[64]
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 [14],[15],[16] $ 3,481  
Fair value at ending balance $ 4,466 [19],[21],[37] $ 3,481 [14],[15],[16]
Basis spread on variable rate 5.50% [19],[21],[37] 5.50% [14],[15],[16]
Interest rate, cash 9.80% [19],[21],[37] 10.00% [14],[15],[16]
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 [16] $ 372  
Fair value at ending balance $ 827 [19] $ 372 [16]
Investment owned, balance (in shares) 1,018 [19] 1,018 [16]
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 [9],[14],[15],[16] $ 0  
Fair value at ending balance $ 80 [19],[21],[22],[37] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 5.50% [19],[21],[22],[37] 5.50% [9],[14],[15],[16]
Interest rate, cash 9.80% [19],[21],[22],[37] 10.00% [9],[14],[15],[16]
Investment, Identifier [Axis]: KAMC Holdings Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 5,353  
Basis spread on variable rate [19],[20],[21] 5.25%  
Interest rate, cash [19],[20],[21] 9.50%  
Investment, Identifier [Axis]: KAMC Holdings Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 155  
Basis spread on variable rate [19],[20],[21],[22] 5.25%  
Interest rate, cash [19],[20],[21],[22] 9.50%  
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 [8],[9],[15],[16],[23] $ 677  
Fair value at ending balance $ 918 [5],[19],[21],[22],[32] $ 677 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.25% [5],[19],[21],[22],[32] 5.25% [8],[9],[15],[16],[23]
Interest rate, cash 7.30% [5],[19],[21],[22],[32] 8.10% [8],[9],[15],[16],[23]
Investment, Identifier [Axis]: Keystone Bidco B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[9],[15],[16],[23] $ 18  
Fair value at ending balance $ 10 [5],[19],[21],[22],[32] $ 18 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.25% [5],[19],[21],[22],[32] 5.25% [8],[9],[15],[16],[23]
Interest rate, cash 7.30% [5],[19],[21],[22],[32] 8.10% [8],[9],[15],[16],[23]
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 [14],[15],[16] $ 13,156  
Fair value at ending balance $ 13,088 [19],[21],[37] $ 13,156 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[37] 4.75% [14],[15],[16]
Interest rate, cash 9.20% [19],[21],[37] 9.50% [14],[15],[16]
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 [13],[16] $ 772  
Fair value at ending balance $ 721 [12],[19] $ 772 [13],[16]
Investment owned, balance (in shares) 637,677.11 [12],[19] 637,677.11 [13],[16]
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[27] $ 9,039  
Basis spread on variable rate [19],[21],[27] 5.25%  
Interest rate, cash [19],[21],[27] 9.50%  
Investment, Identifier [Axis]: LHS Borrower, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ (12)  
Basis spread on variable rate [19],[21],[22],[27] 5.25%  
Interest rate, cash [19],[21],[22],[27] 9.50%  
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 [8],[9],[15],[16],[29] $ 1,952  
Fair value at ending balance $ 2,282 [5],[19],[21],[22],[32] $ 1,952 [8],[9],[15],[16],[29]
Basis spread on variable rate 6.25% [5],[19],[21],[22],[32] 6.00% [8],[9],[15],[16],[29]
Interest rate, cash 8.30% [5],[19],[21],[22],[32] 8.70% [8],[9],[15],[16],[29]
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 [8],[16] $ 1,721  
Fair value at ending balance $ 1,988 [5],[19] $ 1,721 [8],[16]
Investment, interest rate, paid in kind 12.00% [5],[19] 12.00% [8],[16]
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 [8],[9],[15],[16],[28] $ 687  
Fair value at ending balance [8],[9],[15],[16],[28]   $ 687
Basis spread on variable rate [8],[9],[15],[16],[28]   5.75%
Interest rate, cash [8],[9],[15],[16],[28]   10.60%
Investment, Identifier [Axis]: Lattice Group Holdings 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 [5],[19],[21],[37] $ 608  
Basis spread on variable rate [5],[19],[21],[37] 5.75%  
Interest rate, cash [5],[19],[21],[37] 10.10%  
Investment, Identifier [Axis]: Lattice Group Holdings 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 [5],[19],[20],[21],[22] $ 127  
Basis spread on variable rate [5],[19],[20],[21],[22] 5.75%  
Interest rate, cash [5],[19],[20],[21],[22] 9.90%  
Investment, Identifier [Axis]: Lattice Group Holdings Bidco Limited, First Lien Senior Secured Term Loan 3    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[21],[36] $ 154  
Basis spread on variable rate [5],[19],[21],[36] 5.75%  
Interest rate, cash [5],[19],[21],[36] 10.00%  
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 [8],[9],[15],[16],[28] $ (1)  
Fair value at ending balance $ 35 [5],[19],[21],[37] $ (1) [8],[9],[15],[16],[28]
Basis spread on variable rate 5.75% [5],[19],[21],[37] 5.75% [8],[9],[15],[16],[28]
Interest rate, cash 10.10% [5],[19],[21],[37] 10.60% [8],[9],[15],[16],[28]
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 [14],[15],[16] $ 10,029  
Fair value at ending balance $ 9,964 [19],[20],[21] $ 10,029 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21] 4.75% [14],[15],[16]
Interest rate, cash 8.50% [19],[20],[21] 9.40% [14],[15],[16]
Investment, Identifier [Axis]: LeadsOnline, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 180  
Fair value at ending balance $ 199 [19] $ 180 [16]
Investment owned, balance (in shares) 81,739 [19] 81,739 [16]
Investment, Identifier [Axis]: LeadsOnline, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (10)  
Fair value at ending balance $ (7) [19],[20],[21],[22] $ (10) [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 4.75% [9],[14],[15],[16]
Interest rate, cash 8.50% [19],[20],[21],[22] 9.40% [9],[14],[15],[16]
Investment, Identifier [Axis]: Learfield Communications, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 4,085  
Fair value at ending balance [13],[16]   $ 4,085
Investment owned, balance (in shares) [13],[16]   55,198
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 [15],[26] 5,520  
Fair value at ending balance [15],[26]   $ 5,520
Basis spread on variable rate [15],[26]   5.00%
Interest rate, cash [15],[26]   9.60%
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 [16],[43],[68] 0  
Fair value at ending balance [16],[43],[68]   $ 0
Investment, interest rate, paid in kind [16],[43],[68]   6.00%
Investment, Identifier [Axis]: Lifestyle Intermediate II, LLC, Class A Common Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [10],[12] $ 0  
Investment owned, balance (in shares) [10],[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 [11],[14],[15],[16] $ 2,812  
Fair value at ending balance $ 2,535 [10],[19],[20],[21] $ 2,812 [11],[14],[15],[16]
Basis spread on variable rate 7.00% [10],[19],[20],[21] 7.00% [11],[14],[15],[16]
Interest rate, cash 11.60% [10],[19],[20],[21] 11.90% [11],[14],[15],[16]
Investment, Identifier [Axis]: Lockmasters Security Intermediate, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 9,312  
Basis spread on variable rate [19],[20],[21],[22] 5.00%  
Interest rate, cash [19],[20],[21],[22] 9.30%  
Investment, Identifier [Axis]: Lockmasters Security Intermediate, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ (6)  
Basis spread on variable rate [19],[21],[22],[27] 4.50%  
Interest rate, cash [19],[21],[22],[27] 8.80%  
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 [14],[15],[16] $ 7,839  
Fair value at ending balance $ 8,395 [19],[20],[21] $ 7,839 [14],[15],[16]
Basis spread on variable rate 6.00% [19],[20],[21] 3.27% [14],[15],[16]
Investment, interest rate, paid in kind [14],[15],[16]   3.70%
Interest rate, cash 10.60% [19],[20],[21] 8.10% [14],[15],[16]
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 [8],[15],[16],[23] $ 10,829  
Fair value at ending balance [8],[15],[16],[23]   $ 10,829
Basis spread on variable rate [8],[15],[16],[23]   5.38%
Interest rate, cash [8],[15],[16],[23]   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 [5],[19],[21],[24] $ 4,141  
Basis spread on variable rate [5],[19],[21],[24] 5.00%  
Interest rate, cash [5],[19],[21],[24] 7.00%  
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 [9],[15],[16],[26] $ 2,591  
Fair value at ending balance $ 1,437 [19],[20],[21],[22] $ 2,591 [9],[15],[16],[26]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 4.75% [9],[15],[16],[26]
Interest rate, cash 9.00% [19],[20],[21],[22] 9.40% [9],[15],[16],[26]
Investment, Identifier [Axis]: MB Purchaser, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 82  
Fair value at ending balance $ 89 [12],[19] $ 82 [13],[16]
Investment owned, balance (in shares) 66 [12],[19] 66 [13],[16]
Investment, Identifier [Axis]: MB Purchaser, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ (2)  
Fair value at ending balance $ (1) [19],[20],[21],[22] $ (2) [9],[15],[16],[26]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 4.75% [9],[15],[16],[26]
Interest rate, cash 9.00% [19],[20],[21],[22] 9.40% [9],[15],[16],[26]
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 [9],[15],[16],[26] $ 4,899  
Fair value at ending balance $ 4,782 [19],[20],[21],[22] $ 4,899 [9],[15],[16],[26]
Basis spread on variable rate 5.25% [19],[20],[21],[22] 5.25% [9],[15],[16],[26]
Interest rate, cash 9.70% [19],[20],[21],[22] 9.90% [9],[15],[16],[26]
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 [9],[15],[16],[28] $ 4,036  
Fair value at ending balance $ 4,221 [19],[20],[21],[22] $ 4,036 [9],[15],[16],[28]
Basis spread on variable rate 5.50% [19],[20],[21],[22] 5.50% [9],[15],[16],[28]
Interest rate, cash 9.90% [19],[20],[21],[22] 10.20% [9],[15],[16],[28]
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 [13],[16] $ 681  
Fair value at ending balance $ 598 [12],[19] $ 681 [13],[16]
Investment owned, balance (in shares) 746.66 [12],[19] 746.66 [13],[16]
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 [15],[26] $ 6,320  
Fair value at ending balance [15],[26]   $ 6,320
Basis spread on variable rate [15],[26]   7.25%
Interest rate, cash [15],[26]   11.80%
Investment, Identifier [Axis]: MIV Buyer, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 2,621  
Basis spread on variable rate [19],[20],[21],[22] 4.75%  
Interest rate, cash [19],[20],[21],[22] 8.80%  
Investment, Identifier [Axis]: MIV Buyer, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 101  
Investment owned, balance (in shares) [12],[19] 1,007.4  
Investment, Identifier [Axis]: MIV Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (6)  
Basis spread on variable rate [19],[20],[21],[22] 4.75%  
Interest rate, cash [19],[20],[21],[22] 8.80%  
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 [14],[15],[16] $ 662  
Fair value at ending balance $ 348 [19],[21],[27] $ 662 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[27] 5.00% [14],[15],[16]
Interest rate, cash 9.30% [19],[21],[27] 9.50% [14],[15],[16]
Investment, Identifier [Axis]: MNS Buyer, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 106  
Fair value at ending balance $ 189 [12],[19] $ 106 [13],[16]
Investment owned, balance (in shares) 76,923 [12],[19] 76,923 [13],[16]
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 [19],[20],[21],[22] $ 1,540  
Basis spread on variable rate [19],[20],[21],[22] 4.50%  
Interest rate, cash [19],[20],[21],[22] 8.50%  
Investment, Identifier [Axis]: MSI Express Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 990  
Basis spread on variable rate [19],[20],[21],[22] 3.75%  
Interest rate, cash [19],[20],[21],[22] 7.80%  
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 [49] $ 0 $ 9,762
Gross Additions [49],[52]   720
Gross Reductions [49],[54]   (9,620)
Amount of Realized Gain (Loss) [49]   (862)
Amount of Unrealized Gain (Loss) [49]   0
Fair value at ending balance [49]   0
Amount of Interest or Dividends Credited to Income [49],[56]   $ 495
Investment, interest rate, paid in kind [49]   1.50%
Interest rate, cash [49]   4.50%
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 [8],[13],[16],[47],[68] 13,741  
Fair value at ending balance $ 9,713 [5],[12],[19],[69],[70] $ 13,741 [8],[13],[16],[47],[68]
Investment owned, balance (in shares) 18,000 [5],[12],[19],[69],[70] 18,000 [8],[13],[16],[47],[68]
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 [49] $ 13,741 $ 15,430
Gross Additions 0 [51] 9,620 [49],[52]
Gross Reductions 0 [53] 0 [49],[54]
Amount of Realized Gain (Loss) 0 0 [49]
Amount of Unrealized Gain (Loss) (4,028) (11,309) [49]
Fair value at ending balance 9,713 13,741 [49]
Amount of Interest or Dividends Credited to Income $ 0 [55] $ 0 [49],[56]
Investment owned, balance (in shares) 18,000 18,000 [49]
Investment, Identifier [Axis]: MVC Automotive Group GmbH, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[70] $ 1,172  
Interest rate, cash [5],[19],[70] 7.00%  
Investment, Identifier [Axis]: MVC Automotive Group GmbH, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [51] 2,310  
Gross Reductions [53] (1,178)  
Amount of Realized Gain (Loss) 6  
Amount of Unrealized Gain (Loss) 34  
Fair value at ending balance 1,172 $ 0
Amount of Interest or Dividends Credited to Income [55] $ 56  
Interest rate, cash 7.00%  
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 [8],[13],[47],[68] 24
Gross Additions 0 [51] 0 [52]
Gross Reductions 0 [53] (17) [54]
Amount of Realized Gain (Loss) (183) 0
Amount of Unrealized Gain (Loss) 183 (7)
Fair value at ending balance 0 0 [8],[13],[47],[68]
Amount of Interest or Dividends Credited to Income $ 0 [55] $ 48 [56]
Investment owned, balance (in shares) 1,831.4 1,831.4 [8],[13],[47],[68]
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 [8],[13],[47],[68] $ 981
Gross Additions 0 [51] 0 [52]
Gross Reductions (116) [53] (678) [54]
Amount of Realized Gain (Loss) (7,166) 0
Amount of Unrealized Gain (Loss) 7,271 (292)
Fair value at ending balance 0 11 [8],[13],[47],[68]
Amount of Interest or Dividends Credited to Income $ 0 [55] $ 0 [56]
Investment owned, balance (in shares) 71,790.4 71,790.4 [8],[13],[47],[68]
Investment, Identifier [Axis]: Magnetite XIX, Limited, Subordinated Notes    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[11],[14],[16] $ 10,500  
Fair value at ending balance $ 5,129 [5],[10],[20],[21] $ 10,500 [8],[11],[14],[16]
Basis spread on variable rate 8.00% [5],[10],[20],[21] 9.03% [8],[11],[14],[16]
Interest rate, cash 12.30% [5],[10],[20],[21] 13.70% [8],[11],[14],[16]
Investment, Identifier [Axis]: Marmoutier Holding B.V., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[12],[19] $ 0  
Investment owned, balance (in shares) [5],[12],[19] 2,600,592  
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 [8],[9],[15],[16],[29],[43] $ 146  
Fair value at ending balance $ 37 [5],[19],[21],[22],[24] $ 146 [8],[9],[15],[16],[29],[43]
Basis spread on variable rate 6.50% [5],[19],[21],[22],[24] 6.50% [8],[9],[15],[16],[29],[43]
Investment, interest rate, paid in kind 8.50% [5],[19],[21],[22],[24] 10.40% [8],[9],[15],[16],[29],[43]
Investment, Identifier [Axis]: Marmoutier Holding B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[9],[15],[16],[29],[43] $ (53)  
Fair value at ending balance $ 146 [5],[19],[21],[24] $ (53) [8],[9],[15],[16],[29],[43]
Basis spread on variable rate 5.50% [5],[19],[21],[24] 5.75% [8],[9],[15],[16],[29],[43]
Investment, interest rate, paid in kind 7.50% [5],[19],[21],[24] 6.70% [8],[9],[15],[16],[29],[43]
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 [8],[15],[16],[43] $ 185  
Fair value at ending balance $ 159 [5],[19],[21],[32] $ 185 [8],[15],[16],[43]
Basis spread on variable rate [5],[19],[21],[32] 6.25%  
Investment, interest rate, paid in kind 8.30% [5],[19],[21],[32] 6.00% [8],[15],[16],[43]
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 [14],[15],[16] $ 1,747  
Fair value at ending balance $ 1,753 [19],[20],[21] $ 1,747 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21] 4.75% [14],[15],[16]
Interest rate, cash 8.50% [19],[20],[21] 9.50% [14],[15],[16]
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 [15],[16],[57] $ 3,775  
Fair value at ending balance $ 3,660 [19],[21],[31] $ 3,775 [15],[16],[57]
Basis spread on variable rate 4.50% [19],[21],[31] 4.75% [15],[16],[57]
Interest rate, cash 8.60% [19],[21],[31] 9.60% [15],[16],[57]
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 [9],[14],[15],[16] $ (9)  
Fair value at ending balance $ 34 [19],[20],[21],[22] $ (9) [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 4.75% [9],[14],[15],[16]
Interest rate, cash 8.50% [19],[20],[21],[22] 9.50% [9],[14],[15],[16]
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 [9],[15],[16],[57] $ (10)  
Fair value at ending balance $ (8) [19],[21],[22],[31] $ (10) [9],[15],[16],[57]
Basis spread on variable rate 4.50% [19],[21],[22],[31] 4.75% [9],[15],[16],[57]
Interest rate, cash 8.60% [19],[21],[22],[31] 9.60% [9],[15],[16],[57]
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 [8],[15],[35] $ 8,966  
Fair value at ending balance $ 9,829 [5],[21],[34] $ 8,966 [8],[15],[35]
Basis spread on variable rate 5.93% [5],[21],[34] 5.93% [8],[15],[35]
Interest rate, cash 10.00% [5],[21],[34] 11.00% [8],[15],[35]
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 [14],[15] $ 2,211  
Fair value at ending balance $ 892 [20],[21] $ 2,211 [14],[15]
Basis spread on variable rate 7.00% [20],[21] 7.00% [14],[15]
Interest rate, cash 11.40% [20],[21] 11.70% [14],[15]
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 0  
Fair value at ending balance $ 0 [12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 205 [12],[19] 205 [13],[16]
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 [14],[15],[16] $ 3,648  
Fair value at ending balance $ 4,025 [19],[20],[21] $ 3,648 [14],[15],[16]
Basis spread on variable rate 5.50% [19],[20],[21] 5.25% [14],[15],[16]
Interest rate, cash 9.70% [19],[20],[21] 9.70% [14],[15],[16]
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 46  
Fair value at ending balance $ 129 [12],[19] $ 46 [13],[16]
Investment owned, balance (in shares) 1,842 [12],[19] 1,842 [13],[16]
Investment, Identifier [Axis]: Megawatt Acquisitionco, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 108  
Fair value at ending balance $ 66 [19],[20],[21],[22] $ 108 [9],[14],[15],[16]
Basis spread on variable rate 5.50% [19],[20],[21],[22] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.70% [19],[20],[21],[22] 9.70% [9],[14],[15],[16]
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 [8],[13],[16] $ 125  
Fair value at ending balance $ 152 [5],[12],[19] $ 125 [8],[13],[16]
Investment, interest rate, paid in kind [8],[13],[16]   9.00%
Investment owned, balance (in shares) 114.4 [5],[12],[19] 114.4 [8],[13],[16]
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 [8],[13],[16] $ 21  
Fair value at ending balance $ 0 [5],[12],[19] $ 21 [8],[13],[16]
Investment owned, balance (in shares) 28,943.8 [5],[12],[19] 28,943.8 [8],[13],[16]
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 [8],[9],[15],[16],[71] $ 2,750  
Fair value at ending balance $ 3,136 [5],[19],[21],[22],[72] $ 2,750 [8],[9],[15],[16],[71]
Basis spread on variable rate 5.00% [5],[19],[21],[22],[72] 5.50% [8],[9],[15],[16],[71]
Interest rate, cash 9.10% [5],[19],[21],[22],[72] 10.10% [8],[9],[15],[16],[71]
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 ending balance [5],[19],[21],[22],[73] $ 7,374  
Basis spread on variable rate [5],[19],[21],[22],[73] 6.00%  
Interest rate, cash [5],[19],[21],[22],[73] 9.60%  
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 [8],[9],[15],[16],[74] $ 7,008  
Fair value at ending balance [8],[9],[15],[16],[74]   $ 7,008
Basis spread on variable rate [8],[9],[15],[16],[74]   6.00%
Interest rate, cash [8],[9],[15],[16],[74]   10.40%
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 [19],[20],[21] $ 7,233  
Basis spread on variable rate [19],[20],[21] 5.50%  
Interest rate, cash [19],[20],[21] 9.50%  
Investment, Identifier [Axis]: Momentum Textiles, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (7)  
Basis spread on variable rate [19],[20],[21],[22] 5.50%  
Interest rate, cash [19],[20],[21],[22] 9.50%  
Investment, Identifier [Axis]: Moonlight Bidco Limited, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[13],[16] $ 182  
Fair value at ending balance $ 210 [5],[12],[19] $ 182 [8],[13],[16]
Investment owned, balance (in shares) 10,590 [5],[12],[19] 10,590 [8],[13],[16]
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 [8],[9],[15],[16],[33] $ 1,841  
Fair value at ending balance $ 2,000 [5],[19],[21],[22],[34] $ 1,841 [8],[9],[15],[16],[33]
Basis spread on variable rate 5.25% [5],[19],[21],[22],[34] 5.75% [8],[9],[15],[16],[33]
Interest rate, cash 9.20% [5],[19],[21],[22],[34] 10.70% [8],[9],[15],[16],[33]
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 [8],[15],[16],[35] $ 1,641  
Fair value at ending balance $ 1,674 [5],[19],[21],[36] $ 1,641 [8],[15],[16],[35]
Basis spread on variable rate 5.75% [5],[19],[21],[36] 5.25% [8],[15],[16],[35]
Interest rate, cash 10.20% [5],[19],[21],[36] 10.20% [8],[15],[16],[35]
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 [14],[15],[16] $ 6,618  
Fair value at ending balance $ 6,805 [19],[20],[21] $ 6,618 [14],[15],[16]
Basis spread on variable rate 6.25% [19],[20],[21] 6.25% [14],[15],[16]
Interest rate, cash 10.70% [19],[20],[21] 10.70% [14],[15],[16]
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 [9],[14],[15],[16] $ 11,850  
Fair value at ending balance $ 12,127 [19],[20],[21],[22] $ 11,850 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 5.75% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21],[22] 10.40% [9],[14],[15],[16]
Investment, Identifier [Axis]: NAW Buyer LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 524  
Fair value at ending balance $ 614 [19] $ 524 [16]
Investment owned, balance (in shares) 472,512 [19] 472,512 [16]
Investment, Identifier [Axis]: NAW Buyer LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 0  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 5.75% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21],[22] 10.40% [9],[14],[15],[16]
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 [14],[15],[16] $ 6,283  
Fair value at ending balance $ 6,061 [19],[20],[21] $ 6,283 [14],[15],[16]
Basis spread on variable rate 6.50% [19],[20],[21] 6.50% [14],[15],[16]
Interest rate, cash 10.50% [19],[20],[21] 10.80% [14],[15],[16]
Investment, Identifier [Axis]: NF Holdco, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 563  
Fair value at ending balance $ 307 [12],[19] $ 563 [13],[16]
Investment owned, balance (in shares) 639,510 [12],[19] 639,510 [13],[16]
Investment, Identifier [Axis]: NF Holdco, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 276  
Fair value at ending balance $ 610 [19],[20],[21],[22] $ 276 [9],[14],[15],[16]
Basis spread on variable rate 6.50% [19],[20],[21],[22] 6.50% [9],[14],[15],[16]
Interest rate, cash 10.50% [19],[20],[21],[22] 10.80% [9],[14],[15],[16]
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 [8],[9],[15],[16],[23] $ 1,869  
Fair value at ending balance $ 2,139 [5],[19],[21],[22],[24] $ 1,869 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.18% [5],[19],[21],[22],[24] 6.00% [8],[9],[15],[16],[23]
Interest rate, cash 7.20% [5],[19],[21],[22],[24] 9.30% [8],[9],[15],[16],[23]
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 [8],[15],[16],[38] $ 12,459  
Fair value at ending balance $ 13,337 [5],[19],[21],[39] $ 12,459 [8],[15],[16],[38]
Basis spread on variable rate 5.00% [5],[19],[21],[39] 5.00% [8],[15],[16],[38]
Interest rate, cash 8.60% [5],[19],[21],[39] 9.50% [8],[15],[16],[38]
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 [13],[16] $ 578  
Fair value at ending balance [13],[16]   $ 578
Investment owned, balance (in shares) [13],[16]   4,587.38
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 [13],[16] 743  
Fair value at ending balance [13],[16]   $ 743
Investment owned, balance (in shares) [13],[16]   509.71
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 [15],[16],[26] 5,074  
Fair value at ending balance [15],[16],[26]   $ 5,074
Basis spread on variable rate [15],[16],[26]   4.75%
Interest rate, cash [15],[16],[26]   9.40%
Investment, Identifier [Axis]: Narda Acquisitionco., Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] 0  
Fair value at ending balance [9],[15],[16],[26]   $ 0
Basis spread on variable rate [9],[15],[16],[26]   4.75%
Interest rate, cash [9],[15],[16],[26]   9.40%
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 [15],[16],[26] 5,572  
Fair value at ending balance $ 5,528 [19],[21],[27] $ 5,572 [15],[16],[26]
Basis spread on variable rate 4.50% [19],[21],[27] 4.50% [15],[16],[26]
Interest rate, cash 8.80% [19],[21],[27] 9.20% [15],[16],[26]
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 [8],[15],[16],[29] $ 2,456  
Fair value at ending balance $ 2,809 [5],[19],[21],[32] $ 2,456 [8],[15],[16],[29]
Basis spread on variable rate 6.50% [5],[19],[21],[32] 6.50% [8],[15],[16],[29]
Interest rate, cash 9.10% [5],[19],[21],[32] 10.10% [8],[15],[16],[29]
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 [9],[14],[15],[16] $ 7,320  
Fair value at ending balance $ 22,074 [19],[20],[21],[22] $ 7,320 [9],[14],[15],[16]
Basis spread on variable rate 5.25% [19],[20],[21],[22] 5.75% [9],[14],[15],[16]
Interest rate, cash 9.50% [19],[20],[21],[22] 10.50% [9],[14],[15],[16]
Investment, Identifier [Axis]: Next Holdco, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 0  
Fair value at ending balance $ (4) [19],[20],[21],[22] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 5.25% [19],[20],[21],[22] 5.75% [9],[14],[15],[16]
Interest rate, cash 9.50% [19],[20],[21],[22] 10.50% [9],[14],[15],[16]
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 [9],[14],[15],[16] $ 16,910  
Fair value at ending balance $ 12,511 [19],[20],[21] $ 16,910 [9],[14],[15],[16]
Basis spread on variable rate 4.65% [19],[20],[21] 4.75% [9],[14],[15],[16]
Interest rate, cash 8.70% [19],[20],[21] 9.00% [9],[14],[15],[16]
Investment, Identifier [Axis]: Northstar Recycling, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (44)  
Fair value at ending balance $ (35) [19],[20],[21],[22] $ (44) [9],[14],[15],[16]
Basis spread on variable rate 4.65% [19],[20],[21],[22] 4.75% [9],[14],[15],[16]
Interest rate, cash 8.70% [19],[20],[21],[22] 9.00% [9],[14],[15],[16]
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 [15],[16],[26] $ 8,268  
Fair value at ending balance [15],[16],[26]   $ 8,268
Basis spread on variable rate [15],[16],[26]   4.75%
Interest rate, cash [15],[16],[26]   9.30%
Investment, Identifier [Axis]: OA Buyer, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] 783  
Fair value at ending balance [16]   $ 783
Investment owned, balance (in shares) [16]   210,920.11
Investment, Identifier [Axis]: OA Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] (5)  
Fair value at ending balance [9],[15],[16],[26]   $ (5)
Basis spread on variable rate [9],[15],[16],[26]   4.75%
Interest rate, cash [9],[15],[16],[26]   9.30%
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 [15],[16],[26] 3,539  
Fair value at ending balance $ 3,294 [19],[20],[21] $ 3,539 [15],[16],[26]
Basis spread on variable rate 5.00% [19],[20],[21] 5.00% [15],[16],[26]
Interest rate, cash 9.40% [19],[20],[21] 9.70% [15],[16],[26]
Investment, Identifier [Axis]: OAC Holdings I Corp, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 0  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ 0 [9],[15],[16],[26]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.00% [9],[15],[16],[26]
Interest rate, cash 9.40% [19],[20],[21],[22] 9.70% [9],[15],[16],[26]
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 [8],[15],[16],[23] $ 3,241  
Fair value at ending balance $ 3,613 [5],[19],[21],[24] $ 3,241 [8],[15],[16],[23]
Basis spread on variable rate 5.75% [5],[19],[21],[24] 5.50% [8],[15],[16],[23]
Interest rate, cash 7.60% [5],[19],[21],[24] 8.90% [8],[15],[16],[23]
Investment, Identifier [Axis]: ORS Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 4,911  
Basis spread on variable rate [19],[20],[21] 5.00%  
Interest rate, cash [19],[20],[21] 9.00%  
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 [8],[15],[16],[23] $ 931  
Fair value at ending balance $ 1,074 [5],[19],[21],[24] $ 931 [8],[15],[16],[23]
Basis spread on variable rate 5.25% [5],[19],[21],[24] 5.75% [8],[15],[16],[23]
Interest rate, cash 7.30% [5],[19],[21],[24] 8.50% [8],[15],[16],[23]
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 [9],[14],[15],[16] $ 13,901  
Fair value at ending balance $ 18,125 [19],[20],[21] $ 13,901 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.30% [19],[20],[21] 9.80% [9],[14],[15],[16]
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 [16] $ 151  
Fair value at ending balance $ 196 [12],[19] $ 151 [16]
Investment owned, balance (in shares) 173,749 [12],[19] 173,749 [16]
Investment, Identifier [Axis]: OSP Hamilton Purchaser, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 430  
Fair value at ending balance $ 671 [19],[20],[21],[22] $ 430 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.30% [19],[20],[21],[22] 9.80% [9],[14],[15],[16]
Investment, Identifier [Axis]: Ocelot Holdco LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 742  
Fair value at ending balance $ 2,358 [12],[19] $ 742 [13],[16]
Investment owned, balance (in shares) 186.67 [12],[19] 186.67 [13],[16]
Investment, Identifier [Axis]: Ocelot Holdco LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 2,873  
Fair value at ending balance $ 2,438 [19] $ 2,873 [16]
Investment, interest rate, paid in kind 15.00% [19] 15.00% [16]
Investment owned, balance (in shares) 243.81 [19] 243.81 [16]
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 [15],[16] $ 549  
Fair value at ending balance [15],[16]   $ 549
Interest rate, cash [15],[16]   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 beginning balance [15],[16] 2,933  
Fair value at ending balance $ 2,933 [19] $ 2,933 [15],[16]
Interest rate, cash 10.00% [19] 10.00% [15],[16]
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 [8],[15],[16],[26] $ 4,849  
Fair value at ending balance $ 4,837 [5],[19],[21],[27] $ 4,849 [8],[15],[16],[26]
Basis spread on variable rate 6.75% [5],[19],[21],[27] 6.75% [8],[15],[16],[26]
Interest rate, cash 10.90% [5],[19],[21],[27] 11.20% [8],[15],[16],[26]
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 [11],[16],[26] $ 3,681  
Fair value at ending balance [11],[16],[26]   $ 3,681
Basis spread on variable rate [11],[16],[26]   5.00%
Interest rate, cash [11],[16],[26]   9.70%
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 [8],[15],[16],[35] 2,802  
Fair value at ending balance $ 2,955 [5],[19],[21],[36] $ 2,802 [8],[15],[16],[35]
Basis spread on variable rate 5.00% [5],[19],[21],[36] 5.25% [8],[15],[16],[35]
Interest rate, cash 9.20% [5],[19],[21],[36] 10.00% [8],[15],[16],[35]
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 [8],[15],[16],[23] $ 301  
Fair value at ending balance $ 345 [5],[19],[21],[24] $ 301 [8],[15],[16],[23]
Basis spread on variable rate 5.00% [5],[19],[21],[24] 5.25% [8],[15],[16],[23]
Interest rate, cash 7.00% [5],[19],[21],[24] 8.10% [8],[15],[16],[23]
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 [8],[14],[15],[16] $ 522  
Fair value at ending balance $ 528 [5],[19],[20],[21] $ 522 [8],[14],[15],[16]
Basis spread on variable rate 5.00% [5],[19],[20],[21] 5.25% [8],[14],[15],[16]
Interest rate, cash 9.60% [5],[19],[20],[21] 10.00% [8],[14],[15],[16]
Investment, Identifier [Axis]: Owl Intermediate Holdings, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 2,456  
Basis spread on variable rate [19],[20],[21],[22] 4.75%  
Interest rate, cash [19],[20],[21],[22] 9.10%  
Investment, Identifier [Axis]: Owl Intermediate Holdings, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (20)  
Basis spread on variable rate [19],[20],[21],[22] 4.75%  
Interest rate, cash [19],[20],[21],[22] 9.10%  
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 [13],[16] $ 42  
Fair value at ending balance $ 32 [12],[19] $ 42 [13],[16]
Investment owned, balance (in shares) 13.9 [12],[19] 28.8 [13],[16]
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 [9],[14],[15],[16] $ 14,514  
Fair value at ending balance $ 18,368 [19],[20],[21],[22] $ 14,514 [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 4.75% [9],[14],[15],[16]
Interest rate, cash 8.50% [19],[20],[21],[22] 9.30% [9],[14],[15],[16]
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 [8],[9],[15],[16],[23] $ 844  
Fair value at ending balance $ 949 [5],[19],[21],[24] $ 844 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.75% [5],[19],[21],[24] 5.75% [8],[9],[15],[16],[23]
Interest rate, cash 7.80% [5],[19],[21],[24] 8.80% [8],[9],[15],[16],[23]
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 [8],[14],[15],[16] $ 1,408  
Fair value at ending balance $ 1,394 [5],[19],[20],[21] $ 1,408 [8],[14],[15],[16]
Basis spread on variable rate 5.75% [5],[19],[20],[21] 5.75% [8],[14],[15],[16]
Interest rate, cash 10.30% [5],[19],[20],[21] 10.50% [8],[14],[15],[16]
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 [16] $ 3,695  
Fair value at ending balance $ 3,046 [19] $ 3,695 [16]
Interest rate, cash 6.90% [19] 6.90% [16]
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 [8],[15],[16],[29] $ 2,688  
Fair value at ending balance $ 2,780 [5],[19],[21],[24] $ 2,688 [8],[15],[16],[29]
Basis spread on variable rate 5.25% [5],[19],[21],[24] 5.25% [8],[15],[16],[29]
Investment, interest rate, paid in kind [8],[15],[16],[29]   0.80%
Interest rate, cash 7.30% [5],[19],[21],[24] 9.00% [8],[15],[16],[29]
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 [8],[14],[15],[16] $ 1,500  
Fair value at ending balance $ 1,400 [5],[19],[20],[21] $ 1,500 [8],[14],[15],[16]
Basis spread on variable rate 5.25% [5],[19],[20],[21] 5.25% [8],[14],[15],[16]
Interest rate, cash 9.60% [5],[19],[20],[21] 9.90% [8],[14],[15],[16]
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 [9],[15],[16],[26] $ 609  
Fair value at ending balance [9],[15],[16],[26]   $ 609
Basis spread on variable rate [9],[15],[16],[26]   8.30%
Interest rate, cash [9],[15],[16],[26]   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 [19],[21],[27] $ 29  
Basis spread on variable rate [19],[21],[27] 8.25%  
Interest rate, cash [19],[21],[27] 12.50%  
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 [19],[21],[27] $ 593  
Basis spread on variable rate [19],[21],[27] 8.30%  
Interest rate, cash [19],[21],[27] 12.60%  
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 [13],[16] $ 263  
Fair value at ending balance $ 350 [12],[19] $ 263 [13],[16]
Investment owned, balance (in shares) 29,762 [12],[19] 29,762 [13],[16]
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 [19] $ 38  
Investment, interest rate, paid in kind [19] 10.00%  
Investment owned, balance (in shares) [19] 1,229.1  
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 [8],[15],[16],[23] $ 2,045  
Fair value at ending balance $ 2,116 [5],[19],[21],[24] $ 2,045 [8],[15],[16],[23]
Basis spread on variable rate 5.25% [5],[19],[21],[24] 6.75% [8],[15],[16],[23]
Interest rate, cash 7.30% [5],[19],[21],[24] 9.80% [8],[15],[16],[23]
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 [8],[14],[15],[16] $ 2,628  
Fair value at ending balance $ 2,397 [5],[19],[20],[21] $ 2,628 [8],[14],[15],[16]
Basis spread on variable rate 5.25% [5],[19],[20],[21] 7.01% [8],[14],[15],[16]
Interest rate, cash 9.90% [5],[19],[20],[21] 11.60% [8],[14],[15],[16]
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 [8],[16] $ 177  
Fair value at ending balance $ 180 [5],[19] $ 177 [8],[16]
Interest rate, cash 4.70% [5],[19] 4.70% [8],[16]
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 [8],[16] $ 178  
Fair value at ending balance $ 181 [5],[19] $ 178 [8],[16]
Interest rate, cash 5.40% [5],[19] 5.40% [8],[16]
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 [8],[16] $ 180  
Fair value at ending balance $ 181 [5],[19] $ 180 [8],[16]
Interest rate, cash 5.90% [5],[19] 5.90% [8],[16]
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 [8],[16] $ 178  
Fair value at ending balance $ 180 [5],[19] $ 178 [8],[16]
Interest rate, cash 8.50% [5],[19] 8.50% [8],[16]
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 [8],[16] $ 8,904  
Fair value at ending balance $ 9,148 [5],[19] $ 8,904 [8],[16]
Interest rate, cash 11.40% [5],[19] 11.40% [8],[16]
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 [8],[15],[16],[38] $ 2,537  
Fair value at ending balance $ 2,715 [5],[19],[21],[39] $ 2,537 [8],[15],[16],[38]
Basis spread on variable rate 4.75% [5],[19],[21],[39] 5.25% [8],[15],[16],[38]
Interest rate, cash 8.30% [5],[19],[21],[39] 9.70% [8],[15],[16],[38]
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 [14],[15],[16] $ 957  
Fair value at ending balance $ 948 [19],[21],[27] $ 957 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[27] 4.75% [14],[15],[16]
Interest rate, cash 8.90% [19],[21],[27] 9.50% [14],[15],[16]
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 [16] $ 1,229  
Fair value at ending balance $ 1,942 [19] $ 1,229 [16]
Investment owned, balance (in shares) 7,409 [19] 7,409 [16]
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 [9],[14],[15],[16] $ 0  
Fair value at ending balance $ 506 [19],[21],[22],[27] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[22],[27] 4.75% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[21],[22],[27] 9.50% [9],[14],[15],[16]
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 [14],[15],[16] $ 52,940  
Fair value at ending balance $ 47,578 [19],[20],[21] $ 52,940 [14],[15],[16]
Basis spread on variable rate 6.00% [19],[20],[21] 6.00% [14],[15],[16]
Investment, interest rate, paid in kind 4.00% [19],[20],[21] 4.00% [14],[15],[16]
Interest rate, cash 10.60% [19],[20],[21] 10.90% [14],[15],[16]
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 [13],[16] $ 1,262  
Fair value at ending balance $ 0 [12],[19] $ 1,262 [13],[16]
Investment owned, balance (in shares) 2.5582 [12],[19] 2.5582 [13],[16]
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 [13],[16] $ 426  
Fair value at ending balance $ 0 [12],[19] $ 426 [13],[16]
Investment owned, balance (in shares) 0.8634 [12],[19] 0.8634 [13],[16]
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 [13],[16] $ 0  
Fair value at ending balance $ 0 [12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 0.0888 [12],[19] 0.0888 [13],[16]
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 [13],[16] $ 122  
Fair value at ending balance $ 0 [12],[19] $ 122 [13],[16]
Investment owned, balance (in shares) 0.2471 [12],[19] 0.2471 [13],[16]
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 [13],[16] $ 0  
Fair value at ending balance $ 0 [10],[12],[19] $ 0 [13],[16]
Investment owned, balance (in shares) 74 [10],[12],[19] 74 [13],[16]
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 [11],[15],[16],[26],[43] $ 554  
Fair value at ending balance $ 363 [10],[19],[21],[27],[30] $ 554 [11],[15],[16],[26],[43]
Basis spread on variable rate 7.00% [10],[19],[21],[27],[30] 7.00% [11],[15],[16],[26],[43]
Investment, interest rate, paid in kind [10],[19],[21],[27],[30] 11.40%  
Interest rate, cash [11],[15],[16],[26],[43]   11.30%
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 [9],[14],[15],[16] $ 6,710  
Fair value at ending balance $ 9,672 [19],[20],[21],[22] $ 6,710 [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.70% [19],[20],[21],[22] 9.50% [9],[14],[15],[16]
Investment, Identifier [Axis]: PowerGEM Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (26)  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ (26) [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.70% [19],[20],[21],[22] 9.50% [9],[14],[15],[16]
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 [14],[15],[16] $ 7,377  
Fair value at ending balance $ 7,378 [19],[21],[37] $ 7,377 [14],[15],[16]
Basis spread on variable rate 6.25% [19],[21],[37] 6.25% [14],[15],[16]
Interest rate, cash 10.70% [19],[21],[37] 10.70% [14],[15],[16]
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 [14],[15],[16] $ 2,694  
Fair value at ending balance $ 2,717 [19],[21],[37] $ 2,694 [14],[15],[16]
Basis spread on variable rate 6.75% [19],[21],[37] 6.75% [14],[15],[16]
Interest rate, cash 11.20% [19],[21],[37] 11.20% [14],[15],[16]
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 [8],[9],[15],[16],[23] $ 8,750  
Fair value at ending balance $ 9,802 [5],[19],[21],[22],[24] $ 8,750 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.75% [5],[19],[21],[22],[24] 5.75% [8],[9],[15],[16],[23]
Interest rate, cash 7.80% [5],[19],[21],[22],[24] 9.10% [8],[9],[15],[16],[23]
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 [8],[15],[16],[28] $ 2,789  
Fair value at ending balance [8],[15],[16],[28]   $ 2,789
Basis spread on variable rate [8],[15],[16],[28]   5.00%
Interest rate, cash [8],[15],[16],[28]   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 [14],[15],[16] 7,662  
Fair value at ending balance $ 7,652 [19],[21],[27] $ 7,662 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[21],[27] 4.50% [14],[15],[16]
Interest rate, cash 8.50% [19],[21],[27] 8.80% [14],[15],[16]
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 [13],[16] $ 249  
Fair value at ending balance $ 241 [12],[19] $ 249 [13],[16]
Investment owned, balance (in shares) 2,357.5 [12],[19] 2,357.5 [13],[16]
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 [9],[14],[15],[16] $ (28)  
Fair value at ending balance $ 125 [19],[21],[22],[27] $ (28) [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[21],[22],[27] 4.50% [9],[14],[15],[16]
Interest rate, cash 8.50% [19],[21],[22],[27] 8.80% [9],[14],[15],[16]
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 [15],[16],[28] $ 5,338  
Fair value at ending balance $ 5,251 [19],[21],[37] $ 5,338 [15],[16],[28]
Basis spread on variable rate 5.25% [19],[21],[37] 5.25% [15],[16],[28]
Interest rate, cash 9.40% [19],[21],[37] 9.80% [15],[16],[28]
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 [13],[16] $ 237  
Fair value at ending balance $ 106 [12],[19] $ 237 [13],[16]
Investment owned, balance (in shares) 281 [12],[19] 281 [13],[16]
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 [9],[14],[15],[16] $ 5,134  
Fair value at ending balance $ 5,144 [19],[20],[21] $ 5,134 [9],[14],[15],[16]
Basis spread on variable rate 6.25% [19],[20],[21] 6.25% [9],[14],[15],[16]
Interest rate, cash 10.40% [19],[20],[21] 10.60% [9],[14],[15],[16]
Investment, Identifier [Axis]: Process Insights Acquisition, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 889  
Fair value at ending balance $ 915 [19],[20],[21] $ 889 [9],[14],[15],[16]
Basis spread on variable rate 6.25% [19],[20],[21] 6.25% [9],[14],[15],[16]
Interest rate, cash 10.40% [19],[20],[21] 10.60% [9],[14],[15],[16]
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 [15],[16],[26] $ 1,613  
Fair value at ending balance $ 1,599 [19],[21],[27] $ 1,613 [15],[16],[26]
Basis spread on variable rate 5.75% [19],[21],[27] 5.75% [15],[16],[26]
Interest rate, cash 10.00% [19],[21],[27] 10.20% [15],[16],[26]
Investment, Identifier [Axis]: ProfitOptics, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 198  
Fair value at ending balance $ 416 [12],[19] $ 198 [13],[16]
Investment owned, balance (in shares) 241,935.48 [12],[19] 241,935.48 [13],[16]
Investment, Identifier [Axis]: ProfitOptics, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 242  
Fair value at ending balance $ 97 [19],[21],[22],[27] $ 242 [9],[15],[16],[26]
Basis spread on variable rate 5.75% [19],[21],[22],[27] 5.75% [9],[15],[16],[26]
Interest rate, cash 10.00% [19],[21],[22],[27] 10.20% [9],[15],[16],[26]
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 [16] $ 76  
Fair value at ending balance $ 78 [19] $ 76 [16]
Interest rate, cash 8.00% [19] 8.00% [16]
Investment, Identifier [Axis]: Proppants Holding, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [11],[16] $ 0  
Fair value at ending balance [11],[16]   $ 0
Investment owned, balance (in shares) [11],[16]   1,506,254
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 [8],[15],[16],[29] 1,646  
Fair value at ending balance [8],[15],[16],[29]   $ 1,646
Basis spread on variable rate [8],[15],[16],[29]   6.75%
Interest rate, cash [8],[15],[16],[29]   10.00%
Investment, Identifier [Axis]: Protego Bidco 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 [5],[19],[21],[32] $ 1,599  
Basis spread on variable rate [5],[19],[21],[32] 6.00%  
Interest rate, cash [5],[19],[21],[32] 8.10%  
Investment, Identifier [Axis]: Protego Bidco 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 [5],[19],[21],[32] $ 320  
Basis spread on variable rate [5],[19],[21],[32] 6.50%  
Interest rate, cash [5],[19],[21],[32] 8.60%  
Investment, Identifier [Axis]: Protego Bidco B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[15],[16],[29] $ 1,974  
Fair value at ending balance $ 2,302 [5],[19],[21],[32] $ 1,974 [8],[15],[16],[29]
Basis spread on variable rate 6.50% [5],[19],[21],[32] 6.50% [8],[15],[16],[29]
Interest rate, cash 8.60% [5],[19],[21],[32] 9.70% [8],[15],[16],[29]
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 [8],[15],[16],[74] $ 1,694  
Fair value at ending balance $ 1,817 [5],[19],[21],[73] $ 1,694 [8],[15],[16],[74]
Basis spread on variable rate 4.50% [5],[19],[21],[73] 3.75% [8],[15],[16],[74]
Interest rate, cash 8.10% [5],[19],[21],[73] 8.10% [8],[15],[16],[74]
Investment, Identifier [Axis]: Qima Finance LTD, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[20],[21],[22] $ 2,786  
Basis spread on variable rate [5],[19],[20],[21],[22] 5.50%  
Interest rate, cash [5],[19],[20],[21],[22] 9.80%  
Investment, Identifier [Axis]: Qualified Industries, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 61  
Fair value at ending balance $ 127 [12],[19] $ 61 [13],[16]
Investment owned, balance (in shares) 303,030 [12],[19] 303,030 [13],[16]
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 [15],[16],[28] $ 2,567  
Fair value at ending balance $ 7,864 [19],[21],[37] $ 2,567 [15],[16],[28]
Basis spread on variable rate 5.75% [19],[21],[37] 5.75% [15],[16],[28]
Interest rate, cash 9.70% [19],[21],[37] 10.10% [15],[16],[28]
Investment, Identifier [Axis]: Qualified Industries, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 175  
Fair value at ending balance $ 188 [12],[19] $ 175 [13],[16]
Investment, interest rate, paid in kind [13],[16]   12.50%
Investment owned, balance (in shares) 148 [12],[19] 148 [13],[16]
Investment, Identifier [Axis]: Qualified Industries, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[28] $ (5)  
Fair value at ending balance $ (4) [19],[21],[22],[37] $ (5) [9],[15],[16],[28]
Basis spread on variable rate 5.75% [19],[21],[22],[37] 5.75% [9],[15],[16],[28]
Interest rate, cash 9.70% [19],[21],[22],[37] 10.10% [9],[15],[16],[28]
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 [8],[14],[15],[16] $ 7,059  
Fair value at ending balance [8],[14],[15],[16]   $ 7,059
Basis spread on variable rate [8],[14],[15],[16]   6.25%
Interest rate, cash [8],[14],[15],[16]   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 [15],[16],[26] 6,135  
Fair value at ending balance $ 6,052 [19],[20],[21] $ 6,135 [15],[16],[26]
Basis spread on variable rate 6.25% [19],[20],[21] 6.25% [15],[16],[26]
Interest rate, cash 10.50% [19],[20],[21] 10.80% [15],[16],[26]
Investment, Identifier [Axis]: R1 Holdings, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 472  
Fair value at ending balance $ 1,850 [19],[20],[21],[22] $ 472 [9],[15],[16],[26]
Basis spread on variable rate 6.25% [19],[20],[21],[22] 6.25% [9],[15],[16],[26]
Interest rate, cash 10.50% [19],[20],[21],[22] 10.80% [9],[15],[16],[26]
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 [11],[14],[15],[16] $ 12,732  
Fair value at ending balance $ 9,349 [10],[19],[21],[30],[37] $ 12,732 [11],[14],[15],[16]
Basis spread on variable rate 6.75% [10],[19],[21],[30],[37] 6.75% [11],[14],[15],[16]
Investment, interest rate, paid in kind [10],[19],[21],[30],[37] 11.30%  
Interest rate, cash [11],[14],[15],[16]   11.70%
Investment, Identifier [Axis]: RA Outdoors, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [11],[14],[15],[16] $ 1,217  
Fair value at ending balance $ 894 [10],[19],[21],[30],[37] $ 1,217 [11],[14],[15],[16]
Basis spread on variable rate 6.75% [10],[19],[21],[30],[37] 6.75% [11],[14],[15],[16]
Investment, interest rate, paid in kind [10],[19],[21],[30],[37] 11.30%  
Interest rate, cash [11],[14],[15],[16]   11.70%
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 [13],[16] $ 4,595  
Fair value at ending balance $ 0 [12],[19] $ 4,595 [13],[16]
Investment owned, balance (in shares) 1,231 [12],[19] 1,231 [13],[16]
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 [14],[15],[16] $ 1,015  
Fair value at ending balance $ 2,277 [19],[20],[21] $ 1,015 [14],[15],[16]
Basis spread on variable rate 7.00% [19],[20],[21] 8.00% [14],[15],[16]
Investment, interest rate, paid in kind [19],[20],[21] 11.20%  
Interest rate, cash [14],[15],[16]   12.50%
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 [14],[15],[16] $ 2,577  
Fair value at ending balance $ 1,074 [19],[20],[21] $ 2,577 [14],[15],[16]
Basis spread on variable rate 10.00% [19],[20],[21] 8.00% [14],[15],[16]
Investment, interest rate, paid in kind [19],[20],[21] 14.20%  
Interest rate, cash [14],[15],[16]   12.50%
Investment, Identifier [Axis]: RKD Group, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 12,057  
Basis spread on variable rate [19],[20],[21],[22] 5.50%  
Interest rate, cash [19],[20],[21],[22] 9.70%  
Investment, Identifier [Axis]: RKD Group, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 472  
Basis spread on variable rate [19],[20],[21],[22] 5.50%  
Interest rate, cash [19],[20],[21],[22] 9.70%  
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 [9],[14],[15],[16] $ 17,973  
Fair value at ending balance $ 18,131 [19],[20],[21],[22] $ 17,973 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
Investment, Identifier [Axis]: ROI Solutions LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (55)  
Fair value at ending balance $ (13) [19],[20],[21],[22] $ (55) [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
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 [14],[15],[16] $ 21,638  
Fair value at ending balance $ 21,582 [19],[21],[27] $ 21,638 [14],[15],[16]
Basis spread on variable rate 5.25% [19],[21],[27] 5.50% [14],[15],[16]
Interest rate, cash 9.60% [19],[21],[27] 10.60% [14],[15],[16]
Investment, Identifier [Axis]: RPX Corporation, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (39)  
Fair value at ending balance $ (24) [19],[21],[22],[27] $ (39) [9],[14],[15],[16]
Basis spread on variable rate 5.25% [19],[21],[22],[27] 5.50% [9],[14],[15],[16]
Interest rate, cash 9.60% [19],[21],[22],[27] 10.60% [9],[14],[15],[16]
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 [11],[13],[16] $ 0  
Fair value at ending balance $ 0 [10],[12],[19] $ 0 [11],[13],[16]
Investment owned, balance (in shares) 145.347 [10],[12],[19] 145.347 [11],[13],[16]
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 [11],[13],[16] $ 0  
Fair value at ending balance $ 0 [10],[12],[19] $ 0 [11],[13],[16]
Investment owned, balance (in shares) 145.347 [10],[12],[19] 145.347 [11],[13],[16]
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 [11],[13],[16] $ 57  
Fair value at ending balance $ 42 [10],[12],[19] $ 57 [11],[13],[16]
Investment owned, balance (in shares) 7,844.03 [10],[12],[19] 7,844.03 [11],[13],[16]
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 [11],[13],[16] $ 0  
Fair value at ending balance $ 0 [10],[12],[19] $ 0 [11],[13],[16]
Investment owned, balance (in shares) 153 [10],[12],[19] 153 [11],[13],[16]
Investment, Identifier [Axis]: Randys Holdings, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 704  
Investment owned, balance (in shares) [12],[19] 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 [9],[14],[15],[16] $ 10,873  
Fair value at ending balance $ 12,329 [19],[20],[21],[22] $ 10,873 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 6.25% [9],[14],[15],[16]
Interest rate, cash 9.20% [19],[20],[21],[22] 11.20% [9],[14],[15],[16]
Investment, Identifier [Axis]: Randys Holdings, Inc., Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 622  
Fair value at ending balance [13],[16]   $ 622
Investment owned, balance (in shares) [13],[16]   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 [9],[14],[15],[16] 613  
Fair value at ending balance $ 1,144 [19],[20],[21],[22] $ 613 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 6.25% [9],[14],[15],[16]
Interest rate, cash 9.20% [19],[20],[21],[22] 11.20% [9],[14],[15],[16]
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 [9],[15],[16],[28] $ 5,313  
Fair value at ending balance $ 5,224 [19],[20],[21],[22] $ 5,313 [9],[15],[16],[28]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 4.75% [9],[15],[16],[28]
Interest rate, cash 9.10% [19],[20],[21],[22] 9.40% [9],[15],[16],[28]
Investment, Identifier [Axis]: Rapid Buyer LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 533  
Fair value at ending balance $ 413 [12],[19] $ 533 [13],[16]
Investment owned, balance (in shares) 533 [12],[19] 533 [13],[16]
Investment, Identifier [Axis]: Rapid Buyer LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (22)  
Fair value at ending balance $ (35) [19],[20],[21],[22] $ (22) [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 4.75% [9],[14],[15],[16]
Interest rate, cash 9.10% [19],[20],[21],[22] 9.40% [9],[14],[15],[16]
Investment, Identifier [Axis]: Real Chemistry Intermediate III, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ 3,665  
Basis spread on variable rate [19],[21],[22],[27] 4.50%  
Interest rate, cash [19],[21],[22],[27] 8.80%  
Investment, Identifier [Axis]: Real Chemistry Intermediate III, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ (4)  
Basis spread on variable rate [19],[21],[22],[27] 4.50%  
Interest rate, cash [19],[21],[22],[27] 8.80%  
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 [14],[15],[16] $ 11,294  
Fair value at ending balance $ 11,206 [19],[20],[21] $ 11,294 [14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21] 6.00% [14],[15],[16]
Interest rate, cash 10.20% [19],[20],[21] 10.70% [14],[15],[16]
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 [13],[16] $ 81  
Fair value at ending balance $ 95 [12],[19] $ 81 [13],[16]
Investment owned, balance (in shares) 187,235 [12],[19] 187,235 [13],[16]
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 [14],[15],[16] $ 4,308  
Fair value at ending balance $ 4,439 [19],[20],[21] $ 4,308 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21] 5.50% [14],[15],[16]
Interest rate, cash 9.30% [19],[20],[21] 10.10% [14],[15],[16]
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 [13],[16] $ 85  
Fair value at ending balance $ 140 [12],[19] $ 85 [13],[16]
Investment owned, balance (in shares) 202,393.6 [12],[19] 202,393.6 [13],[16]
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 [11],[13],[16] $ 98  
Fair value at ending balance $ 67 [10],[12],[19] $ 98 [11],[13],[16]
Investment owned, balance (in shares) 38,571 [10],[12],[19] 38,571 [11],[13],[16]
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 [8],[9],[16] $ 26,044  
Fair value at ending balance [8],[9],[16]   $ 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 [8],[15],[16],[23] 1,963  
Fair value at ending balance $ 2,215 [5],[19],[21],[24] $ 1,963 [8],[15],[16],[23]
Basis spread on variable rate 6.25% [5],[19],[21],[24] 6.25% [8],[15],[16],[23]
Interest rate, cash 8.30% [5],[19],[21],[24] 9.60% [8],[15],[16],[23]
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 [60] $ 243 [7],[13],[16] $ 844
Gross Additions 0 [44] 0 [60],[61]
Gross Reductions 0 [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) 955 (601) [60]
Fair value at ending balance 1,198 [4],[19] 243 [7],[13],[16],[60]
Amount of Interest or Dividends Credited to Income $ 308 [46] $ 0 [60],[63]
Investment owned, balance (in shares) 23.8 [4],[19] 23.8 [7],[13],[16],[60]
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 [60] $ 83,000 [7],[9],[14],[16] $ 73,113
Gross Additions 6,576 [44] 12,098 [60],[61]
Gross Reductions 0 [45] (2,222) [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) (17) 11 [60]
Fair value at ending balance 89,559 [4],[19],[20],[22] 83,000 [7],[9],[14],[16],[60]
Amount of Interest or Dividends Credited to Income $ 6,576 [46] $ 8,598 [60],[63]
Basis spread on variable rate 6.00% [4],[19],[20],[22] 6.00% [7],[9],[14],[16],[60]
Investment, interest rate, paid in kind 10.30% [4],[19],[20],[22] 10.30% [7],[9],[14],[16],[60]
Investment owned, balance (in shares) 71,000 [4],[19],[20],[22] 71,000 [7],[9],[14],[16],[60]
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 [14],[15],[16] $ 6,426  
Fair value at ending balance $ 6,449 [19],[21],[27] $ 6,426 [14],[15],[16]
Basis spread on variable rate 5.50% [19],[21],[27] 5.50% [14],[15],[16]
Interest rate, cash 9.70% [19],[21],[27] 10.70% [14],[15],[16]
Investment, Identifier [Axis]: Rock Labor LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 1,127  
Fair value at ending balance $ 1,368 [19] $ 1,127 [16]
Investment owned, balance (in shares) 233,871 [19] 233,871 [16]
Investment, Identifier [Axis]: Rock Labor LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (19)  
Fair value at ending balance $ (7) [19],[20],[21],[22] $ (19) [9],[14],[15],[16]
Basis spread on variable rate 5.50% [19],[20],[21],[22] 5.50% [9],[14],[15],[16]
Interest rate, cash 9.70% [19],[20],[21],[22] 10.70% [9],[14],[15],[16]
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 [14],[15],[16] $ 8,098  
Fair value at ending balance [14],[15],[16]   $ 8,098
Basis spread on variable rate [14],[15],[16]   5.50%
Interest rate, cash [14],[15],[16]   10.00%
Investment, Identifier [Axis]: Royal Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] (2)  
Fair value at ending balance [9],[14],[15],[16]   $ (2)
Basis spread on variable rate [9],[14],[15],[16]   5.50%
Interest rate, cash [9],[14],[15],[16]   10.00%
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 [14],[15],[16] 6,792  
Fair value at ending balance [14],[15],[16]   $ 6,792
Basis spread on variable rate [14],[15],[16]   2.25%
Investment, interest rate, paid in kind [14],[15],[16]   4.30%
Interest rate, cash [14],[15],[16]   7.00%
Investment, Identifier [Axis]: Ruffalo Noel Levitz, LLC, First Lien Senior Secured Term Loan 1    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[30] $ 2,412  
Basis spread on variable rate [19],[20],[21],[30] 4.00%  
Investment, interest rate, paid in kind [19],[20],[21],[30] 6.80%  
Investment, Identifier [Axis]: Ruffalo Noel Levitz, LLC, First Lien Senior Secured Term Loan 2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[27] $ 6  
Basis spread on variable rate [19],[21],[27] 7.00%  
Interest rate, cash [19],[21],[27] 11.30%  
Investment, Identifier [Axis]: Ruffalo Noel Levitz, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ 0  
Basis spread on variable rate [19],[21],[22],[27] 7.00%  
Interest rate, cash [19],[21],[22],[27] 11.30%  
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 [14],[15],[16] $ 508  
Fair value at ending balance $ 516 [19],[20],[21] $ 508 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21] 5.00% [14],[15],[16]
Investment, interest rate, paid in kind 1.50% [19],[20],[21] 1.50% [14],[15],[16]
Interest rate, cash 7.80% [19],[20],[21] 8.20% [14],[15],[16]
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 [9],[15],[16],[26] $ 8,648  
Fair value at ending balance $ 8,624 [19],[21],[22],[27] $ 8,648 [9],[15],[16],[26]
Basis spread on variable rate 5.00% [19],[21],[22],[27] 5.00% [9],[15],[16],[26]
Interest rate, cash 9.20% [19],[21],[22],[27] 9.60% [9],[15],[16],[26]
Investment, Identifier [Axis]: SBP Holdings LP, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (13)  
Fair value at ending balance $ (5) [19],[21],[22],[27] $ (13) [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[22],[27] 5.00% [9],[14],[15],[16]
Interest rate, cash 9.20% [19],[21],[22],[27] 9.60% [9],[14],[15],[16]
Investment, Identifier [Axis]: SCP Medical Products, LLC., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 2,016  
Basis spread on variable rate [19],[20],[21] 4.75%  
Interest rate, cash [19],[20],[21] 8.80%  
Investment, Identifier [Axis]: SCP Medical Products, LLC., LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 52  
Investment owned, balance (in shares) [12],[19] 393.3  
Investment, Identifier [Axis]: SCP Medical Products, LLC., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (2)  
Basis spread on variable rate [19],[20],[21],[22] 4.75%  
Interest rate, cash [19],[20],[21],[22] 8.80%  
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 [9],[14],[15],[16] $ 6,591  
Fair value at ending balance $ 6,956 [19],[20],[21] $ 6,591 [9],[14],[15],[16]
Basis spread on variable rate 5.25% [19],[20],[21] 5.75% [9],[14],[15],[16]
Interest rate, cash 9.40% [19],[20],[21] 10.50% [9],[14],[15],[16]
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 [13],[16] $ 280  
Fair value at ending balance $ 195 [12],[19] $ 280 [13],[16]
Investment owned, balance (in shares) 277,917 [12],[19] 274,229 [13],[16]
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 [9],[14],[15],[16] $ 6,990  
Fair value at ending balance $ 7,237 [19],[20],[21],[22] $ 6,990 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 9.30% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
Investment, Identifier [Axis]: SPATCO Energy Solutions, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (18)  
Fair value at ending balance $ (14) [19],[20],[21],[22] $ (18) [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 9.30% [19],[20],[21],[22] 9.60% [9],[14],[15],[16]
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 [8],[9],[15],[16],[33] $ 4,368  
Fair value at ending balance $ 7,087 [5],[19],[21],[34] $ 4,368 [8],[9],[15],[16],[33]
Basis spread on variable rate 6.00% [5],[19],[21],[34] 6.00% [8],[9],[15],[16],[33]
Interest rate, cash 10.10% [5],[19],[21],[34] 10.70% [8],[9],[15],[16],[33]
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 [8],[15],[16],[35] $ 941  
Fair value at ending balance $ 1,019 [5],[19],[21],[36] $ 941 [8],[15],[16],[35]
Basis spread on variable rate 6.45% [5],[19],[21],[36] 6.45% [8],[15],[16],[35]
Interest rate, cash 10.60% [5],[19],[21],[36] 11.20% [8],[15],[16],[35]
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 [9],[14],[15],[16] $ 583  
Fair value at ending balance $ 641 [19],[20],[21] $ 583 [9],[14],[15],[16]
Basis spread on variable rate 6.75% [19],[20],[21] 6.75% [9],[14],[15],[16]
Interest rate, cash 11.00% [19],[20],[21] 11.30% [9],[14],[15],[16]
Investment, Identifier [Axis]: SVI International LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 277  
Fair value at ending balance $ 364 [19] $ 277 [16]
Investment owned, balance (in shares) 207,921 [19] 207,921 [16]
Investment, Identifier [Axis]: SVI International LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (1)  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ (1) [9],[14],[15],[16]
Basis spread on variable rate 6.75% [19],[20],[21],[22] 6.75% [9],[14],[15],[16]
Interest rate, cash 11.00% [19],[20],[21],[22] 11.30% [9],[14],[15],[16]
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 [9],[14],[15],[16] $ 17,592  
Fair value at ending balance $ 13,525 [19],[20],[21] $ 17,592 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21] 9.50% [9],[14],[15],[16]
Investment, Identifier [Axis]: Saab Purchaser, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (24)  
Fair value at ending balance $ (24) [19],[20],[21],[22] $ (24) [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[20],[21],[22] 9.50% [9],[14],[15],[16]
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 [14],[15],[16] $ 14,812  
Fair value at ending balance $ 14,697 [19],[20],[21] $ 14,812 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21] 5.00% [14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21] 9.50% [14],[15],[16]
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 [13],[16] $ 537  
Fair value at ending balance $ 504 [12],[19] $ 537 [13],[16]
Investment owned, balance (in shares) 378.7 [12],[19] 378.7 [13],[16]
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 [8],[9],[15],[16],[29] $ 3,692  
Fair value at ending balance $ 4,250 [5],[19],[21],[22],[32] $ 3,692 [8],[9],[15],[16],[29]
Basis spread on variable rate 5.00% [5],[19],[21],[22],[32] 5.75% [8],[9],[15],[16],[29]
Interest rate, cash 7.30% [5],[19],[21],[22],[32] 8.80% [8],[9],[15],[16],[29]
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 [8],[15],[16],[66] $ 2,788  
Fair value at ending balance $ 3,256 [5],[19],[21],[75] $ 2,788 [8],[15],[16],[66]
Basis spread on variable rate 5.00% [5],[19],[21],[75] 5.75% [8],[15],[16],[66]
Interest rate, cash 5.00% [5],[19],[21],[75] 7.00% [8],[15],[16],[66]
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 [8],[15],[16],[66] $ 46  
Fair value at ending balance [8],[15],[16],[66]   $ 46
Basis spread on variable rate [8],[15],[16],[66]   6.75%
Interest rate, cash [8],[15],[16],[66]   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 [8],[9],[15],[16],[23] 534  
Fair value at ending balance $ 1,020 [5],[19],[21],[22],[24] $ 534 [8],[9],[15],[16],[23]
Basis spread on variable rate 5.00% [5],[19],[21],[22],[24] 5.25% [8],[9],[15],[16],[23]
Interest rate, cash 7.00% [5],[19],[21],[22],[24] 8.60% [8],[9],[15],[16],[23]
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 [14],[15],[16] $ 1,605  
Fair value at ending balance $ 1,589 [19],[20],[21] $ 1,605 [14],[15],[16]
Basis spread on variable rate 2.25% [19],[20],[21] 5.50% [14],[15],[16]
Investment, interest rate, paid in kind [19],[20],[21] 3.80%  
Interest rate, cash 6.40% [19],[20],[21] 10.20% [14],[15],[16]
Investment, Identifier [Axis]: Scaled Agile, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [14],[15],[16] $ 302  
Fair value at ending balance $ 299 [19],[20],[21] $ 302 [14],[15],[16]
Basis spread on variable rate 2.25% [19],[20],[21] 5.50% [14],[15],[16]
Investment, interest rate, paid in kind [19],[20],[21] 3.80%  
Interest rate, cash 6.40% [19],[20],[21] 10.20% [14],[15],[16]
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 [8],[15],[16],[23] $ 3,297  
Fair value at ending balance $ 3,525 [5],[19],[21],[32] $ 3,297 [8],[15],[16],[23]
Basis spread on variable rate 5.75% [5],[19],[21],[32] 5.50% [8],[15],[16],[23]
Interest rate, cash 7.80% [5],[19],[21],[32] 8.40% [8],[15],[16],[23]
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 [8],[14],[15],[16] $ 442  
Fair value at ending balance $ 416 [5],[19],[21],[37] $ 442 [8],[14],[15],[16]
Basis spread on variable rate 5.75% [5],[19],[21],[37] 5.57% [8],[14],[15],[16]
Interest rate, cash 10.00% [5],[19],[21],[37] 10.10% [8],[14],[15],[16]
Investment, Identifier [Axis]: Scout Bidco B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[9],[15],[16],[23] $ (14)  
Fair value at ending balance $ 384 [5],[19],[21],[22],[32] $ (14) [8],[9],[15],[16],[23]
Basis spread on variable rate 5.50% [5],[19],[21],[22],[32] 5.50% [8],[9],[15],[16],[23]
Interest rate, cash 7.50% [5],[19],[21],[22],[32] 8.40% [8],[9],[15],[16],[23]
Investment, Identifier [Axis]: Screenvision, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 5,102  
Basis spread on variable rate [19],[20],[21] 5.00%  
Interest rate, cash [19],[20],[21] 9.30%  
Investment, Identifier [Axis]: Screenvision, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (11)  
Basis spread on variable rate [19],[20],[21],[22] 5.00%  
Interest rate, cash [19],[20],[21],[22] 9.30%  
Investment, Identifier [Axis]: Screenvision, LLC, Second Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 32,545  
Basis spread on variable rate [19],[20],[21] 8.50%  
Interest rate, cash [19],[20],[21] 12.80%  
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 [49] $ 6,655 $ 6,328
Gross Additions 168 [51] 327 [49],[52]
Gross Reductions 0 [53] 0 [49],[54]
Amount of Realized Gain (Loss) 0 0 [49]
Amount of Unrealized Gain (Loss) 0 0 [49]
Fair value at ending balance 6,823 6,655 [49]
Amount of Interest or Dividends Credited to Income $ 254 [55] $ 326 [49],[56]
Investment, interest rate, paid in kind 5.00% 5.00% [49]
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 [49] $ 399 $ 311
Gross Additions 0 [51] 0 [49],[52]
Gross Reductions 0 [53] 0 [49],[54]
Amount of Realized Gain (Loss) 0 0 [49]
Amount of Unrealized Gain (Loss) 61 88 [49]
Fair value at ending balance 460 399 [49]
Amount of Interest or Dividends Credited to Income $ 0 [55] $ 0 [49],[56]
Investment owned, balance (in shares) 17,100 17,100 [49]
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 [49] $ 37,296 $ 29,080
Gross Additions 0 [51] 0 [49],[52]
Gross Reductions 0 [53] 0 [49],[54]
Amount of Realized Gain (Loss) 0 0 [49]
Amount of Unrealized Gain (Loss) 5,650 8,216 [49]
Fair value at ending balance 42,946 37,296 [49]
Amount of Interest or Dividends Credited to Income $ 2,817 [55] $ 0 [49],[56]
Investment owned, balance (in shares) 1,236 1,236 [49]
Investment, Identifier [Axis]: Security Holdings B.V, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [49] $ 5,333 $ 3,866
Gross Additions 165 [51] 1,828 [49],[52]
Gross Reductions (3) [53] (12) [49],[54]
Amount of Realized Gain (Loss) 2 17 [49]
Amount of Unrealized Gain (Loss) 730 (366) [49]
Fair value at ending balance 6,227 5,333 [49]
Amount of Interest or Dividends Credited to Income $ 283 [55] $ 188 [49],[56]
Investment, interest rate, paid in kind 6.00%  
Interest rate, cash [49]   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 [49] $ 11,191 $ 10,867
Gross Additions 352 [51] 324 [49],[52]
Gross Reductions 0 [53] 0 [49],[54]
Amount of Realized Gain (Loss) 0 0 [49]
Amount of Unrealized Gain (Loss) 0 0 [49]
Fair value at ending balance 11,543 11,191 [49]
Amount of Interest or Dividends Credited to Income $ 268 [55] $ 273 [49],[56]
Investment, interest rate, paid in kind 3.10% 3.10% [49]
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 [49] $ 2,293 $ 2,236
Gross Additions 234 [51] 208 [49],[52]
Gross Reductions 0 [53] 0 [49],[54]
Amount of Realized Gain (Loss) 0 0 [49]
Amount of Unrealized Gain (Loss) 318 (151) [49]
Fair value at ending balance 2,845 2,293 [49]
Amount of Interest or Dividends Credited to Income $ 304 [55] $ 255 [49],[56]
Investment, interest rate, paid in kind 9.00% 9.00% [49]
Interest rate, cash [49]   6.00%
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 [8],[16],[47],[68] $ 6,655  
Fair value at ending balance $ 6,823 [5],[19],[69],[70] $ 6,655 [8],[16],[47],[68]
Investment, interest rate, paid in kind 5.00% [5],[19],[69],[70] 5.00% [8],[16],[47],[68]
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 [8],[13],[16],[47],[68] $ 399  
Fair value at ending balance $ 460 [5],[12],[19],[69],[70] $ 399 [8],[13],[16],[47],[68]
Investment owned, balance (in shares) 17,100 [5],[12],[19],[69],[70] 17,100 [8],[13],[16],[47],[68]
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 [8],[13],[16],[47],[68] $ 37,296  
Fair value at ending balance $ 42,946 [5],[19],[69],[70] $ 37,296 [8],[13],[16],[47],[68]
Investment owned, balance (in shares) 1,236 [5],[19],[69],[70] 1,236 [8],[13],[16],[47],[68]
Investment, Identifier [Axis]: Security Holdings B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[9],[16],[47],[68] $ 5,333  
Fair value at ending balance $ 6,227 [5],[19],[22],[69],[70] $ 5,333 [8],[9],[16],[47],[68]
Investment, interest rate, paid in kind [5],[19],[22],[69],[70] 6.00%  
Interest rate, cash [8],[9],[16],[47],[68]   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 [8],[16],[47],[68] $ 11,191  
Fair value at ending balance $ 11,543 [5],[19],[69],[70] $ 11,191 [8],[16],[47],[68]
Investment, interest rate, paid in kind 3.10% [5],[19],[69],[70] 3.10% [8],[16],[47],[68]
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 [8],[16],[47],[68] $ 2,293  
Fair value at ending balance $ 2,845 [5],[19],[69],[70] $ 2,293 [8],[16],[47],[68]
Investment, interest rate, paid in kind 9.00% [5],[19],[69],[70] 9.00% [8],[16],[47],[68]
Interest rate, cash [8],[16],[47],[68]   6.00%
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 [5],[19],[21],[41] $ 3,167  
Basis spread on variable rate [5],[19],[21],[41] 5.13%  
Interest rate, cash [5],[19],[21],[41] 7.00%  
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 [8],[15],[16],[29] $ 903  
Fair value at ending balance [8],[15],[16],[29]   $ 903
Basis spread on variable rate [8],[15],[16],[29]   6.00%
Interest rate, cash [8],[15],[16],[29]   8.70%
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 [8],[15],[16],[29] 1,524  
Fair value at ending balance [8],[15],[16],[29]   $ 1,524
Basis spread on variable rate [8],[15],[16],[29]   6.75%
Interest rate, cash [8],[15],[16],[29]   9.70%
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 [13] 655  
Fair value at ending balance $ 895 [12] $ 655 [13]
Investment owned, balance (in shares) 109,127 [12] 109,127 [13]
Investment, Identifier [Axis]: Shelf Bidco Ltd, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[16] $ 4,668  
Fair value at ending balance $ 4,620 [5],[10],[19] $ 4,668 [8],[16]
Investment owned, balance (in shares) 1,200,000 [5],[10],[19] 1,200,000 [8],[16]
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 [8],[14],[15],[16] $ 12,153  
Fair value at ending balance $ 12,070 [5],[19],[20],[21] $ 12,153 [8],[14],[15],[16]
Basis spread on variable rate 5.00% [5],[19],[20],[21] 5.00% [8],[14],[15],[16]
Interest rate, cash 9.30% [5],[19],[20],[21] 9.60% [8],[14],[15],[16]
Investment, Identifier [Axis]: Sierra Senior Loan Strategy JV I LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [6],[7],[8],[11] $ 41,453  
Fair value at ending balance [6],[7],[8],[11]   $ 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 [44] 0 [61]
Gross Reductions 0 [45] 0 [62]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (3,115) 2,281
Fair value at ending balance 38,338 [3],[4],[5],[10] 41,453
Amount of Interest or Dividends Credited to Income 5,353 [46] 2,225 [63]
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 [8],[9],[15],[16],[29] 1,858  
Fair value at ending balance $ 1,980 [5],[19],[21],[22],[24] $ 1,858 [8],[9],[15],[16],[29]
Basis spread on variable rate 6.50% [5],[19],[21],[22],[24] 6.00% [8],[9],[15],[16],[29]
Interest rate, cash 8.50% [5],[19],[21],[22],[24] 9.30% [8],[9],[15],[16],[29]
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 [7],[9],[16] $ 3,586  
Fair value at ending balance $ 15,641 [4],[19],[22] $ 3,586 [7],[9],[16]
Investment, interest rate, paid in kind [7],[9],[16]   12.00%
Interest rate, cash [4],[19],[22] 12.00%  
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 [60] $ 3,586 $ 0
Gross Additions 12,236 [44] 3,586 [60],[61]
Gross Reductions (181) [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) 0 0 [60]
Fair value at ending balance 15,641 3,586 [60]
Amount of Interest or Dividends Credited to Income $ 927 [46] $ 36 [60],[63]
Investment, interest rate, paid in kind 12.00% 12.00% [60]
Investment, Identifier [Axis]: Skyvault Holdings LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [7],[13],[16] $ 1,195  
Fair value at ending balance $ 5,214 [4],[12],[19] $ 1,195 [7],[13],[16]
Investment owned, balance (in shares) 4,046,326.8 [4],[12],[19] 1,195,449.6 [7],[13],[16]
Investment, Identifier [Axis]: Skyvault Holdings LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [60] $ 1,195 $ 0
Gross Additions 4,027 [44] 1,195 [60],[61]
Gross Reductions 0 [45] 0 [60],[62]
Amount of Realized Gain (Loss) 0 0 [60]
Amount of Unrealized Gain (Loss) (8) 0 [60]
Fair value at ending balance 5,214 1,195 [60]
Amount of Interest or Dividends Credited to Income $ 0 [46] $ 0 [60],[63]
Investment owned, balance (in shares) 4,046,326.8 1,195,449.6 [60]
Investment, Identifier [Axis]: SmartShift Group, Inc., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 483  
Fair value at ending balance $ 568 [12],[19] $ 483 [13],[16]
Investment owned, balance (in shares) 275 [12],[19] 275 [13],[16]
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 [14],[15],[16] $ 12,944  
Fair value at ending balance $ 12,846 [19],[21],[37] $ 12,944 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[37] 5.00% [14],[15],[16]
Interest rate, cash 9.20% [19],[21],[37] 9.50% [14],[15],[16]
Investment, Identifier [Axis]: SmartShift Group, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 0  
Fair value at ending balance $ 0 [19],[21],[22],[37] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[21],[22],[37] 5.00% [9],[14],[15],[16]
Interest rate, cash 9.20% [19],[21],[22],[37] 9.50% [9],[14],[15],[16]
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 [14],[15],[16] $ 10,437  
Fair value at ending balance $ 10,357 [19],[21],[37] $ 10,437 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[21],[37] 4.50% [14],[15],[16]
Interest rate, cash 8.80% [19],[21],[37] 9.00% [14],[15],[16]
Investment, Identifier [Axis]: Smartling, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 0  
Fair value at ending balance $ 0 [19],[21],[22],[37] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 4.50% [19],[21],[22],[37] 4.50% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[21],[22],[37] 9.00% [9],[14],[15],[16]
Investment, Identifier [Axis]: Smile Brands Group Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 4,592  
Basis spread on variable rate [19],[20],[21] 6.00%  
Interest rate, cash [19],[20],[21] 10.40%  
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 [14],[15],[16] $ 1,230  
Fair value at ending balance [14],[15],[16]   $ 1,230
Basis spread on variable rate [14],[15],[16]   6.00%
Interest rate, cash [14],[15],[16]   10.70%
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 [14],[15],[16] 3,477  
Fair value at ending balance [14],[15],[16]   $ 3,477
Basis spread on variable rate [14],[15],[16]   8.50%
Interest rate, cash [14],[15],[16]   13.20%
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 [13],[16] 325  
Fair value at ending balance $ 300 [19] $ 325 [13],[16]
Investment owned, balance (in shares) 516,399 [19] 516,399 [13],[16]
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 [14],[15],[16] $ 14,826  
Fair value at ending balance $ 14,851 [19],[20],[21] $ 14,826 [14],[15],[16]
Basis spread on variable rate 6.25% [19],[20],[21] 6.25% [14],[15],[16]
Interest rate, cash 10.40% [19],[20],[21] 10.70% [14],[15],[16]
Investment, Identifier [Axis]: Solo Buyer, L.P., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 466  
Fair value at ending balance $ 816 [19],[20],[21],[22] $ 466 [9],[14],[15],[16]
Basis spread on variable rate 6.25% [19],[20],[21],[22] 6.25% [9],[14],[15],[16]
Interest rate, cash 10.40% [19],[20],[21],[22] 10.70% [9],[14],[15],[16]
Investment, Identifier [Axis]: Sonicwall US Holdings Inc, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [20],[21] $ 2,742  
Basis spread on variable rate [20],[21] 5.50%  
Interest rate, cash [20],[21] 9.50%  
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 [8],[11],[13] $ 61  
Fair value at ending balance 32 [5],[10],[12] $ 61 [8],[11],[13]
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 [9],[15],[16],[28] 2,057  
Fair value at ending balance $ 2,282 [19],[20],[21] $ 2,057 [9],[15],[16],[28]
Basis spread on variable rate 5.00% [19],[20],[21] 5.00% [9],[15],[16],[28]
Interest rate, cash 9.00% [19],[20],[21] 9.20% [9],[15],[16],[28]
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 [9],[15],[16],[28] $ (1)  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ (1) [9],[15],[16],[28]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.00% [9],[15],[16],[28]
Interest rate, cash 9.00% [19],[20],[21],[22] 9.20% [9],[15],[16],[28]
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 [14],[15],[16] $ 14,706  
Fair value at ending balance $ 14,654 [19],[21],[27] $ 14,706 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[27] 5.50% [14],[15],[16]
Interest rate, cash 8.80% [19],[21],[27] 10.00% [14],[15],[16]
Investment, Identifier [Axis]: Spatial Business Systems LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (21)  
Fair value at ending balance $ (14) [19],[21],[22],[27] $ (21) [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[22],[27] 5.50% [9],[14],[15],[16]
Interest rate, cash 8.80% [19],[21],[22],[27] 10.00% [9],[14],[15],[16]
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 [8],[15],[16],[28] $ 2,500  
Fair value at ending balance $ 2,472 [5],[19],[21],[37] $ 2,500 [8],[15],[16],[28]
Basis spread on variable rate 5.00% [5],[19],[21],[37] 5.00% [8],[15],[16],[28]
Interest rate, cash 9.20% [5],[19],[21],[37] 9.60% [8],[15],[16],[28]
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 [9],[14],[15],[16] $ 17,712  
Fair value at ending balance $ 7,171 [19],[20],[21],[22] $ 17,712 [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.50% [9],[14],[15],[16]
Interest rate, cash 9.20% [19],[20],[21],[22] 10.40% [9],[14],[15],[16]
Investment, Identifier [Axis]: Superjet Buyer, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (38)  
Fair value at ending balance $ (18) [19],[20],[21],[22] $ (38) [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.50% [9],[14],[15],[16]
Interest rate, cash 9.20% [19],[20],[21],[22] 10.40% [9],[14],[15],[16]
Investment, Identifier [Axis]: Swoop Intermediate III, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ 1,977  
Basis spread on variable rate [19],[21],[22],[27] 4.50%  
Interest rate, cash [19],[21],[22],[27] 8.80%  
Investment, Identifier [Axis]: Swoop Intermediate III, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ 0  
Basis spread on variable rate [19],[21],[22],[27] 4.50%  
Interest rate, cash [19],[21],[22],[27] 8.80%  
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 [16] $ 10,076  
Fair value at ending balance $ 11,136 [19] $ 10,076 [16]
Investment, interest rate, paid in kind 12.50% [19] 12.50% [16]
Investment owned, balance (in shares) 7,575,758 [19] 7,575,758 [16]
Investment, Identifier [Axis]: TA KHP Aggregator, L.P., Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 47  
Investment owned, balance (in shares) [12],[19] 47,209.6  
Investment, Identifier [Axis]: TA KHP Aggregator, L.P., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 1,013  
Basis spread on variable rate [19],[20],[21],[22] 4.50%  
Interest rate, cash [19],[20],[21],[22] 8.50%  
Investment, Identifier [Axis]: TA KHP Aggregator, L.P., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ (4)  
Basis spread on variable rate [19],[20],[21],[22] 4.50%  
Interest rate, cash [19],[20],[21],[22] 8.50%  
Investment, Identifier [Axis]: TA KHP Aggregator, L.P., Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19] $ 2,224  
Interest rate, cash [19] 12.50%  
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 [13],[16] $ 84  
Fair value at ending balance $ 91 [12],[19] $ 84 [13],[16]
Investment owned, balance (in shares) 1,589 [12],[19] 1,589 [13],[16]
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 [16] $ 2,785  
Fair value at ending balance $ 3,148 [19] $ 2,785 [16]
Investment, interest rate, paid in kind 7.80% [19] 7.80% [16]
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 [9],[14],[15],[16] $ 13,517  
Fair value at ending balance $ 9,491 [19],[21],[27] $ 13,517 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[27] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[21],[27] 9.50% [9],[14],[15],[16]
Investment, Identifier [Axis]: TAPCO Buyer LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 252  
Fair value at ending balance $ 451 [12],[19] $ 252 [13],[16]
Investment owned, balance (in shares) 339 [12],[19] 252 [13],[16]
Investment, Identifier [Axis]: TAPCO Buyer LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (44)  
Fair value at ending balance $ (18) [19],[21],[22],[27] $ (44) [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[21],[22],[27] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[21],[22],[27] 9.50% [9],[14],[15],[16]
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 [9],[15],[16],[26] $ 10,187  
Fair value at ending balance $ 5,114 [19],[21],[22],[27] $ 10,187 [9],[15],[16],[26]
Basis spread on variable rate 4.75% [19],[21],[22],[27] 4.75% [9],[15],[16],[26]
Interest rate, cash 8.90% [19],[21],[22],[27] 9.30% [9],[15],[16],[26]
Investment, Identifier [Axis]: THG Acquisition, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 97  
Fair value at ending balance $ 102 [19],[21],[22],[27] $ 97 [9],[15],[16],[26]
Basis spread on variable rate 4.75% [19],[21],[22],[27] 4.75% [9],[15],[16],[26]
Interest rate, cash 8.90% [19],[21],[22],[27] 9.30% [9],[15],[16],[26]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 14,111  
Basis spread on variable rate [19],[20],[21],[22] 5.00%  
Interest rate, cash [19],[20],[21],[22] 9.20%  
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 [14],[15],[16] $ 2,572  
Fair value at ending balance [14],[15],[16]   $ 2,572
Basis spread on variable rate [14],[15],[16]   4.50%
Interest rate, cash [14],[15],[16]   9.00%
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 [14],[15],[16] 953  
Fair value at ending balance [14],[15],[16]   $ 953
Basis spread on variable rate [14],[15],[16]   4.75%
Interest rate, cash [14],[15],[16]   9.30%
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 [14],[15],[16] 1,192  
Fair value at ending balance [14],[15],[16]   $ 1,192
Basis spread on variable rate [14],[15],[16]   5.00%
Interest rate, cash [14],[15],[16]   9.50%
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 [9],[14],[15],[16] 7,837  
Fair value at ending balance [9],[14],[15],[16]   $ 7,837
Basis spread on variable rate [9],[14],[15],[16]   5.00%
Interest rate, cash [9],[14],[15],[16]   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 [16] 26  
Fair value at ending balance $ 33 [19] $ 26 [16]
Investment owned, balance (in shares) 4,673 [19] 4,673 [16]
Investment, Identifier [Axis]: TSYL Corporate Buyer, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (4)  
Fair value at ending balance $ 0 [19],[20],[21],[22] $ (4) [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 4.75% [9],[14],[15],[16]
Interest rate, cash 9.20% [19],[20],[21],[22] 9.30% [9],[14],[15],[16]
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 [15],[16],[28] $ 7,792  
Fair value at ending balance $ 7,763 [19],[21],[27] $ 7,792 [15],[16],[28]
Basis spread on variable rate 5.75% [19],[21],[27] 5.75% [15],[16],[28]
Interest rate, cash 10.00% [19],[21],[27] 10.20% [15],[16],[28]
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 [9],[15],[16],[26] $ 2,868  
Fair value at ending balance $ 2,996 [19],[21],[27] $ 2,868 [9],[15],[16],[26]
Basis spread on variable rate 6.00% [19],[21],[27] 6.00% [9],[15],[16],[26]
Interest rate, cash 10.30% [19],[21],[27] 10.70% [9],[15],[16],[26]
Investment, Identifier [Axis]: Tank Holding Corp, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[28] $ (12)  
Fair value at ending balance $ (9) [19],[21],[22],[27] $ (12) [9],[15],[16],[28]
Basis spread on variable rate 5.75% [19],[21],[22],[27] 5.75% [9],[15],[16],[28]
Interest rate, cash 10.00% [19],[21],[22],[27] 10.20% [9],[15],[16],[28]
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 [8],[9],[15],[16],[33] $ 1,643  
Fair value at ending balance $ 1,776 [5],[19],[21],[22],[34] $ 1,643 [8],[9],[15],[16],[33]
Basis spread on variable rate 5.25% [5],[19],[21],[22],[34] 5.25% [8],[9],[15],[16],[33]
Interest rate, cash 9.50% [5],[19],[21],[22],[34] 10.00% [8],[9],[15],[16],[33]
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 [16] $ 35  
Fair value at ending balance [16]   $ 35
Interest rate, cash [16]   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 [13],[16] 625  
Fair value at ending balance $ 429 [12],[19] $ 625 [13],[16]
Investment owned, balance (in shares) 516,640.2 [12],[19] 516,640.2 [13],[16]
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 [16] $ 702  
Fair value at ending balance $ 741 [19] $ 702 [16]
Interest rate, cash 14.00% [19] 12.00% [16]
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 [8],[9],[15],[16],[25] $ 677  
Fair value at ending balance $ 812 [5],[19],[21],[22],[39] $ 677 [8],[9],[15],[16],[25]
Basis spread on variable rate 5.25% [5],[19],[21],[22],[39] 5.50% [8],[9],[15],[16],[25]
Interest rate, cash 8.90% [5],[19],[21],[22],[39] 10.30% [8],[9],[15],[16],[25]
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 [8],[15],[16],[23] $ 3,609  
Fair value at ending balance $ 4,112 [5],[19],[21],[24] $ 3,609 [8],[15],[16],[23]
Basis spread on variable rate 5.40% [5],[19],[21],[24] 5.40% [8],[15],[16],[23]
Interest rate, cash 7.40% [5],[19],[21],[24] 8.70% [8],[15],[16],[23]
Investment, Identifier [Axis]: Techone B.V., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[9],[15],[16],[23] $ (4)  
Fair value at ending balance $ (2) [5],[19],[21],[22],[24] $ (4) [8],[9],[15],[16],[23]
Basis spread on variable rate 5.40% [5],[19],[21],[22],[24] 5.40% [8],[9],[15],[16],[23]
Interest rate, cash 7.40% [5],[19],[21],[22],[24] 8.70% [8],[9],[15],[16],[23]
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 [14],[15],[16] $ 8,364  
Fair value at ending balance $ 6,688 [19],[20],[21],[22] $ 8,364 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 5.00% [14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21],[22] 9.80% [14],[15],[16]
Investment, Identifier [Axis]: Tencarva Machinery Company, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (18)  
Fair value at ending balance $ (24) [19],[20],[21],[22] $ (18) [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 5.00% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21],[22] 9.80% [9],[14],[15],[16]
Investment, Identifier [Axis]: Terrybear, Inc., Partnership Equity    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 120  
Fair value at ending balance $ 14 [12],[19] $ 120 [13],[16]
Investment owned, balance (in shares) 24,358.97 [12],[19] 24,358.97 [13],[16]
Investment, Identifier [Axis]: Terrybear, Inc., Subordinated Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 268  
Fair value at ending balance $ 265 [19] $ 268 [16]
Investment, interest rate, paid in kind 4.00% [19] 4.00% [16]
Interest rate, cash 10.00% [19] 10.00% [16]
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 [14],[15],[16] $ 2,647  
Fair value at ending balance $ 13,682 [19],[20],[21],[22] $ 2,647 [14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 4.25% [14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21],[22] 8.80% [14],[15],[16]
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 [9],[14],[15],[16] $ 0  
Fair value at ending balance $ (20) [19],[20],[21],[22] $ 0 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 4.25% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21],[22] 8.80% [9],[14],[15],[16]
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 [15],[16],[28] $ 3,791  
Fair value at ending balance [15],[16],[28]   $ 3,791
Basis spread on variable rate [15],[16],[28]   7.75%
Investment, interest rate, paid in kind [15],[16],[28]   3.20%
Interest rate, cash [15],[16],[28]   9.00%
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 [14],[15] 3,595  
Fair value at ending balance $ 59 [20],[21] $ 3,595 [14],[15]
Basis spread on variable rate 4.75% [20],[21] 4.75% [14],[15]
Interest rate, cash 8.70% [20],[21] 9.10% [14],[15]
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 [16] $ 2,180  
Fair value at ending balance $ 1,963 [12],[19] $ 2,180 [16]
Investment owned, balance (in shares) 676,881 [12],[19] 676,881 [16]
Investment, Identifier [Axis]: Thompson Rivers LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [6],[7],[13] $ 7,208  
Fair value at ending balance [6],[7],[13]   $ 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 [44] 0 [61]
Gross Reductions (2,396) [45] (5,991) [62]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (44) (166)
Fair value at ending balance 4,768 [3],[4],[12] 7,208
Amount of Interest or Dividends Credited to Income 0 [46] 0 [63]
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 [14],[15],[16] 8,518  
Fair value at ending balance $ 8,304 [19],[20],[21] $ 8,518 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21] 4.50% [14],[15],[16]
Investment, interest rate, paid in kind 1.00% [19],[20],[21] 1.00% [14],[15],[16]
Interest rate, cash 8.70% [19],[20],[21] 9.20% [14],[15],[16]
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 [14],[15],[16] $ 14,420  
Fair value at ending balance $ 13,237 [19],[20],[21] $ 14,420 [14],[15],[16]
Basis spread on variable rate 1.00% [19],[20],[21] 5.50% [14],[15],[16]
Investment, interest rate, paid in kind [19],[20],[21] 6.80%  
Interest rate, cash 5.10% [19],[20],[21] 10.30% [14],[15],[16]
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 [15],[16],[26] $ 6,787  
Fair value at ending balance $ 6,815 [19],[21],[27] $ 6,787 [15],[16],[26]
Basis spread on variable rate 5.50% [19],[21],[27] 5.50% [15],[16],[26]
Interest rate, cash 9.70% [19],[21],[27] 10.10% [15],[16],[26]
Investment, Identifier [Axis]: Trintech, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 145  
Fair value at ending balance $ 151 [19],[21],[22],[27] $ 145 [9],[15],[16],[26]
Basis spread on variable rate 5.50% [19],[21],[22],[27] 5.50% [9],[15],[16],[26]
Interest rate, cash 9.70% [19],[21],[22],[27] 10.10% [9],[15],[16],[26]
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 [11],[13],[16] $ 0  
Fair value at ending balance [11],[13],[16]   $ 0
Investment owned, balance (in shares) [11],[13],[16]   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 [14],[15],[16] 7,754  
Fair value at ending balance $ 7,782 [19],[20],[21] $ 7,754 [14],[15],[16]
Basis spread on variable rate 6.00% [19],[20],[21] 6.00% [14],[15],[16]
Interest rate, cash 10.20% [19],[20],[21] 10.80% [14],[15],[16]
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 [15],[16],[26] $ 4,874  
Fair value at ending balance $ 4,836 [19],[21],[27] $ 4,874 [15],[16],[26]
Basis spread on variable rate 5.75% [19],[21],[27] 5.75% [15],[16],[26]
Interest rate, cash 10.00% [19],[21],[27] 10.40% [15],[16],[26]
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 [8],[15],[16],[23] $ 536  
Fair value at ending balance $ 770 [5],[19],[21],[24] $ 536 [8],[15],[16],[23]
Basis spread on variable rate 5.25% [5],[19],[21],[24] 5.25% [8],[15],[16],[23]
Interest rate, cash 7.30% [5],[19],[21],[24] 9.60% [8],[15],[16],[23]
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 [8],[9],[15],[16],[42] $ 1,450  
Fair value at ending balance $ 1,704 [5],[19],[21],[22],[76] $ 1,450 [8],[9],[15],[16],[42]
Basis spread on variable rate 5.25% [5],[19],[21],[22],[76] 5.25% [8],[9],[15],[16],[42]
Interest rate, cash 7.30% [5],[19],[21],[22],[76] 8.40% [8],[9],[15],[16],[42]
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 [9],[14],[15],[16] $ 12,982  
Fair value at ending balance $ 7,793 [19],[20],[21],[22] $ 12,982 [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 4.75% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21],[22] 9.30% [9],[14],[15],[16]
Investment, Identifier [Axis]: UHY Advisors, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (35)  
Fair value at ending balance $ 273 [19],[20],[21],[22] $ (35) [9],[14],[15],[16]
Basis spread on variable rate 4.75% [19],[20],[21],[22] 4.75% [9],[14],[15],[16]
Interest rate, cash 8.90% [19],[20],[21],[22] 9.30% [9],[14],[15],[16]
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 [8],[15],[16],[33] $ 11,041  
Fair value at ending balance $ 12,334 [5],[19],[21],[34] $ 11,041 [8],[15],[16],[33]
Basis spread on variable rate 7.25% [5],[19],[21],[34] 7.25% [8],[15],[16],[33]
Interest rate, cash 11.30% [5],[19],[21],[34] 12.30% [8],[15],[16],[33]
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 [5],[19],[20],[21] $ 5,843  
Basis spread on variable rate [5],[19],[20],[21] 7.50%  
Interest rate, cash [5],[19],[20],[21] 11.90%  
Investment, Identifier [Axis]: US Bank National Association Series 2025-2, Structured Note - Class R    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[21],[27] $ 5,000  
Basis spread on variable rate [5],[21],[27] 7.00%  
Interest rate, cash [5],[21],[27] 10.90%  
Investment, Identifier [Axis]: USLS Acquisition, Inc. (f/k/a US Legal Support, Inc.), First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21] $ 17,921  
Basis spread on variable rate [19],[20],[21] 5.50%  
Interest rate, cash [19],[20],[21] 10.00%  
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 [14],[15],[16] $ 12,487  
Fair value at ending balance [14],[15],[16]   $ 12,487
Basis spread on variable rate [14],[15],[16]   5.75%
Interest rate, cash [14],[15],[16]   10.50%
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 [14],[15],[16] 5,411  
Fair value at ending balance [14],[15],[16]   $ 5,411
Basis spread on variable rate [14],[15],[16]   5.75%
Interest rate, cash [14],[15],[16]   10.50%
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 [8],[9],[15],[16],[35] 930  
Fair value at ending balance $ 1,048 [5],[19],[21],[22],[36] $ 930 [8],[9],[15],[16],[35]
Basis spread on variable rate 4.30% [5],[19],[21],[22],[36] 4.84% [8],[9],[15],[16],[35]
Interest rate, cash 9.00% [5],[19],[21],[22],[36] 9.80% [8],[9],[15],[16],[35]
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 [8],[9],[15],[16],[23] $ 1,204  
Fair value at ending balance [8],[9],[15],[16],[23]   $ 1,204
Basis spread on variable rate [8],[9],[15],[16],[23]   6.75%
Interest rate, cash [8],[9],[15],[16],[23]   10.00%
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 [8],[9],[15],[16],[23] 1,962  
Fair value at ending balance $ 2,227 [5],[19],[21],[22],[24] $ 1,962 [8],[9],[15],[16],[23]
Basis spread on variable rate 4.45% [5],[19],[21],[22],[24] 4.93% [8],[9],[15],[16],[23]
Interest rate, cash 6.50% [5],[19],[21],[22],[24] 8.30% [8],[9],[15],[16],[23]
Investment, Identifier [Axis]: Unosquare, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ 2,363  
Basis spread on variable rate [19],[21],[22],[27] 4.75%  
Interest rate, cash [19],[21],[22],[27] 8.90%  
Investment, Identifier [Axis]: Unosquare, LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 261  
Investment owned, balance (in shares) [12],[19] 260,817.7  
Investment, Identifier [Axis]: Unosquare, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[21],[22],[27] $ (9)  
Basis spread on variable rate [19],[21],[22],[27] 4.75%  
Interest rate, cash [19],[21],[22],[27] 8.90%  
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 [8],[15],[16],[23] $ 1,500  
Fair value at ending balance $ 1,812 [5],[19],[21],[24] $ 1,500 [8],[15],[16],[23]
Basis spread on variable rate 6.15% [5],[19],[21],[24] 4.60% [8],[15],[16],[23]
Investment, interest rate, paid in kind 2.40% [5],[19],[21],[24] 2.40% [8],[15],[16],[23]
Interest rate, cash 8.20% [5],[19],[21],[24] 4.90% [8],[15],[16],[23]
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 [8],[14],[15],[16] $ 2,471  
Fair value at ending balance $ 3,616 [5],[19],[20],[21] $ 2,471 [8],[14],[15],[16]
Basis spread on variable rate 4.00% [5],[19],[20],[21] 6.75% [8],[14],[15],[16]
Investment, interest rate, paid in kind 2.40% [5],[19],[20],[21] 1.80% [8],[14],[15],[16]
Interest rate, cash 8.90% [5],[19],[20],[21] 9.40% [8],[14],[15],[16]
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 [8],[14],[15],[16] $ 943  
Fair value at ending balance [8],[14],[15],[16]   $ 943
Basis spread on variable rate [8],[14],[15],[16]   6.75%
Investment, interest rate, paid in kind [8],[14],[15],[16]   2.40%
Interest rate, cash [8],[14],[15],[16]   8.80%
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 [19],[20],[21] $ 43,695  
Basis spread on variable rate [19],[20],[21] 8.50%  
Interest rate, cash [19],[20],[21] 12.50%  
Investment, Identifier [Axis]: VB Spine Intermediary II LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [12],[19] $ 0  
Investment owned, balance (in shares) [12],[19] 767,670.7  
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 [8],[11],[13] $ 15  
Fair value at ending balance 45 [5],[10],[12] $ 15 [8],[11],[13]
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 [8],[11],[13] 1,072  
Fair value at ending balance 1 [5],[10],[12] 1,072 [8],[11],[13]
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 [15],[16],[26] 4,783  
Fair value at ending balance [15],[16],[26]   $ 4,783
Basis spread on variable rate [15],[16],[26]   5.25%
Interest rate, cash [15],[16],[26]   9.90%
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 [11],[13],[16] 2  
Fair value at ending balance $ 2 [10],[12],[19] $ 2 [11],[13],[16]
Investment owned, balance (in shares) 4,676 [10],[12],[19] 4,676 [11],[13],[16]
Investment, Identifier [Axis]: Velocity Pooling Vehicle, LLC, Warrants    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [11],[13],[16] $ 3  
Fair value at ending balance $ 3 [10],[12],[19] $ 3 [11],[13],[16]
Investment owned, balance (in shares) 5,591 [10],[12],[19] 5,591 [11],[13],[16]
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 [8],[15],[16],[35] $ 3,787  
Fair value at ending balance $ 4,016 [5],[19],[21],[36] $ 3,787 [8],[15],[16],[35]
Basis spread on variable rate 6.50% [5],[19],[21],[36] 6.50% [8],[15],[16],[35]
Interest rate, cash 10.70% [5],[19],[21],[36] 11.70% [8],[15],[16],[35]
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 [11],[14],[15] $ 6,256  
Fair value at ending balance $ 6,194 [10],[20],[21] $ 6,256 [11],[14],[15]
Basis spread on variable rate 7.25% [10],[20],[21] 7.25% [11],[14],[15]
Interest rate, cash 11.80% [10],[20],[21] 12.10% [11],[14],[15]
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 [8],[16] $ 495  
Fair value at ending balance $ 484 [5] $ 495 [8],[16]
Interest rate, cash 9.50% [5] 9.50% [8],[16]
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 [16] $ 3,160  
Fair value at ending balance [16]   $ 3,160
Interest rate, cash [16]   6.30%
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 [14],[15],[16] 7,241  
Fair value at ending balance $ 17,776 [19],[20],[21] $ 7,241 [14],[15],[16]
Basis spread on variable rate 4.50% [19],[20],[21] 5.50% [14],[15],[16]
Interest rate, cash 8.70% [19],[20],[21] 10.00% [14],[15],[16]
Investment, Identifier [Axis]: Vital Buyer, LLC, Partnership Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 388  
Fair value at ending balance $ 433 [19] $ 388 [16]
Investment owned, balance (in shares) 16,442.9 [19] 16,442.9 [16]
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 [14],[15],[16] $ 11,772  
Fair value at ending balance [14],[15],[16]   $ 11,772
Basis spread on variable rate [14],[15],[16]   4.75%
Interest rate, cash [14],[15],[16]   9.30%
Investment, Identifier [Axis]: WEST-NR ACQUISITIONCO, LLC, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 10,795  
Basis spread on variable rate [19],[20],[21],[22] 5.00%  
Interest rate, cash [19],[20],[21],[22] 9.40%  
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 [9],[14],[15],[16] $ 2,502  
Fair value at ending balance [9],[14],[15],[16]   $ 2,502
Basis spread on variable rate [9],[14],[15],[16]   5.00%
Interest rate, cash [9],[14],[15],[16]   9.70%
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 [14],[15],[16] 5,959  
Fair value at ending balance [14],[15],[16]   $ 5,959
Basis spread on variable rate [14],[15],[16]   5.00%
Interest rate, cash [14],[15],[16]   9.70%
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 [9],[14],[15],[16] 1,816  
Fair value at ending balance [9],[14],[15],[16]   $ 1,816
Basis spread on variable rate [9],[14],[15],[16]   5.00%
Interest rate, cash [9],[14],[15],[16]   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 [14],[15],[16] 12,050  
Fair value at ending balance $ 12,055 [19],[20],[21] $ 12,050 [14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21] 5.75% [14],[15],[16]
Interest rate, cash 9.00% [19],[20],[21] 10.40% [14],[15],[16]
Investment, Identifier [Axis]: WWEC Holdings III Corp, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ (35)  
Fair value at ending balance $ (15) [19],[20],[21],[22] $ (35) [9],[14],[15],[16]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 5.75% [9],[14],[15],[16]
Interest rate, cash 9.00% [19],[20],[21],[22] 10.40% [9],[14],[15],[16]
Investment, Identifier [Axis]: Waccamaw River LLC, Member Interest    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [6],[7],[8] $ 10,730  
Fair value at ending balance [6],[7],[8]   $ 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 [44] 0 [61]
Gross Reductions (4,925) [45] (2,087) [62]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (262) (2,653)
Fair value at ending balance 5,543 [3],[4],[5] 10,730
Amount of Interest or Dividends Credited to Income 745 [46] 3,535 [63]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [19],[20],[21],[22] $ 12,868  
Basis spread on variable rate [19],[20],[21],[22] 5.00%  
Interest rate, cash [19],[20],[21],[22] 9.00%  
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 [14],[15],[16] $ 1,802  
Fair value at ending balance [14],[15],[16]   $ 1,802
Basis spread on variable rate [14],[15],[16]   5.50%
Interest rate, cash [14],[15],[16]   10.60%
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 [9],[14],[15],[16] (36)  
Fair value at ending balance [9],[14],[15],[16]   $ (36)
Basis spread on variable rate [9],[14],[15],[16]   5.50%
Interest rate, cash [9],[14],[15],[16]   10.60%
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 [15],[16],[26] 8,525  
Fair value at ending balance [15],[16],[26]   $ 8,525
Basis spread on variable rate [15],[16],[26]   6.50%
Interest rate, cash [15],[16],[26]   11.10%
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., LP Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] 975  
Fair value at ending balance $ 1,105 [12],[19] $ 975 [13],[16]
Investment owned, balance (in shares) 63,087.1 [12],[19] 63,087.1 [13],[16]
Investment, Identifier [Axis]: Whitcraft Holdings, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 993  
Fair value at ending balance $ 975 [19],[20],[21],[22] $ 993 [9],[15],[16],[26]
Basis spread on variable rate 5.00% [19],[20],[21],[22] 6.50% [9],[15],[16],[26]
Interest rate, cash 9.00% [19],[20],[21],[22] 11.10% [9],[15],[16],[26]
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 [8],[9],[14],[15],[16] $ 1,747  
Fair value at ending balance [8],[9],[14],[15],[16]   $ 1,747
Basis spread on variable rate [8],[9],[14],[15],[16]   5.50%
Interest rate, cash [8],[9],[14],[15],[16]   10.20%
Investment, Identifier [Axis]: White 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 [5],[19],[20],[21] $ 1,723  
Basis spread on variable rate [5],[19],[20],[21] 4.75%  
Interest rate, cash [5],[19],[20],[21] 9.10%  
Investment, Identifier [Axis]: White 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 [5],[19],[20],[21] $ 518  
Basis spread on variable rate [5],[19],[20],[21] 4.75%  
Interest rate, cash [5],[19],[20],[21] 9.10%  
Investment, Identifier [Axis]: Woodland Foods, LLC, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 1,271  
Fair value at ending balance $ 1,417 [12],[19] $ 1,271 [13],[16]
Investment owned, balance (in shares) 1,663.3 [12],[19] 1,663.3 [13],[16]
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 [14],[15],[16] $ 6,097  
Fair value at ending balance $ 17,078 [19],[20],[21] $ 6,097 [14],[15],[16]
Basis spread on variable rate 5.50% [19],[20],[21] 5.25% [14],[15],[16]
Interest rate, cash 9.80% [19],[20],[21] 9.90% [14],[15],[16]
Investment, Identifier [Axis]: Woodland Foods, LLC, Preferred Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [16] $ 427  
Fair value at ending balance [16]   $ 427
Investment, interest rate, paid in kind [16]   20.00%
Investment owned, balance (in shares) [16]   364.00
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 [19] $ 494  
Investment, interest rate, paid in kind [19] 20.00%  
Investment owned, balance (in shares) [19] 364.00  
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 [19] $ 136  
Investment, interest rate, paid in kind [19] 20.00%  
Investment owned, balance (in shares) [19] 94.60  
Investment, Identifier [Axis]: Woodland Foods, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 1,043  
Fair value at ending balance $ (28) [19],[20],[21],[22] $ 1,043 [9],[14],[15],[16]
Basis spread on variable rate 5.50% [19],[20],[21],[22] 5.25% [9],[14],[15],[16]
Interest rate, cash 9.80% [19],[20],[21],[22] 9.90% [9],[14],[15],[16]
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 [15],[16],[26] $ 13,785  
Fair value at ending balance $ 13,792 [19],[21],[37] $ 13,785 [15],[16],[26]
Basis spread on variable rate 4.50% [19],[21],[37] 5.75% [15],[16],[26]
Interest rate, cash 8.60% [19],[21],[37] 10.30% [15],[16],[26]
Investment, Identifier [Axis]: World 50, Inc., Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ (8)  
Fair value at ending balance $ 0 [19],[21],[22],[37] $ (8) [9],[15],[16],[26]
Basis spread on variable rate 4.50% [19],[21],[22],[37] 5.75% [9],[15],[16],[26]
Interest rate, cash 8.60% [19],[21],[22],[37] 10.30% [9],[15],[16],[26]
Investment, Identifier [Axis]: Xeinadin Bidco Limited, Common Stock    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [8],[13],[16] $ 572  
Fair value at ending balance $ 1,230 [5],[12],[19] $ 572 [8],[13],[16]
Investment owned, balance (in shares) 45,665,825 [5],[12],[19] 45,665,825 [8],[13],[16]
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 [8],[15],[16],[29] $ 283  
Fair value at ending balance $ 328 [5],[19],[21],[32] $ 283 [8],[15],[16],[29]
Basis spread on variable rate 5.75% [5],[19],[21],[32] 5.25% [8],[15],[16],[29]
Interest rate, cash 7.90% [5],[19],[21],[32] 8.20% [8],[15],[16],[29]
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 [8],[15],[16],[35] $ 8,598  
Fair value at ending balance $ 9,455 [5],[19],[21],[22],[36] $ 8,598 [8],[15],[16],[35]
Basis spread on variable rate 5.75% [5],[19],[21],[22],[36] 5.25% [8],[15],[16],[35]
Interest rate, cash 9.70% [5],[19],[21],[22],[36] 10.00% [8],[15],[16],[35]
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 [8],[16] $ 3,691  
Fair value at ending balance $ 4,395 [5],[19] $ 3,691 [8],[16]
Investment, interest rate, paid in kind 11.00% [5],[19] 11.00% [8],[16]
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 [14],[15],[16] $ 9,053  
Fair value at ending balance $ 11,511 [19],[20],[21],[22] $ 9,053 [14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.50% [14],[15],[16]
Interest rate, cash 9.90% [19],[20],[21],[22] 10.30% [14],[15],[16]
Investment, Identifier [Axis]: ZB Holdco LLC, LLC Units    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [13],[16] $ 197  
Fair value at ending balance $ 298 [12],[19] $ 197 [13],[16]
Investment owned, balance (in shares) 152.69 [12],[19] 152.69 [13],[16]
Investment, Identifier [Axis]: ZB Holdco LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[14],[15],[16] $ 495  
Fair value at ending balance $ 907 [19],[20],[21],[22] $ 495 [9],[14],[15],[16]
Basis spread on variable rate 5.75% [19],[20],[21],[22] 5.50% [9],[14],[15],[16]
Interest rate, cash 9.90% [19],[20],[21],[22] 10.30% [9],[14],[15],[16]
Investment, Identifier [Axis]: Zelda Luxco S.A.S, First Lien Senior Secured Term Loan    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [5],[19],[21],[22],[32] $ 1,700  
Basis spread on variable rate [5],[19],[21],[22],[32] 5.25%  
Interest rate, cash [5],[19],[21],[22],[32] 7.20%  
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 [8],[15],[16],[35] $ 4,691  
Fair value at ending balance [8],[15],[16],[35]   $ 4,691
Basis spread on variable rate [8],[15],[16],[35]   6.25%
Interest rate, cash [8],[15],[16],[35]   11.20%
Investment, Identifier [Axis]: Zeppelin 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 0  
Gross Additions [44] 2,503  
Gross Reductions [45] (11)  
Amount of Realized Gain (Loss) (4,329)  
Amount of Unrealized Gain (Loss) 4,131  
Fair value at ending balance 2,294 [4],[5],[19],[21],[36] $ 0
Amount of Interest or Dividends Credited to Income [46] $ (6)  
Basis spread on variable rate [4],[5],[19],[21],[36] 6.50%  
Investment, interest rate, paid in kind [4],[5],[19],[21],[36] 11.30%  
Investment, Identifier [Axis]: Zeppelin 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 $ 0  
Gross Additions [44] 305  
Gross Reductions [45]  
Amount of Realized Gain (Loss) (506)  
Amount of Unrealized Gain (Loss) 474  
Fair value at ending balance 273 [4],[5],[19],[21],[36] 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Basis spread on variable rate [4],[5],[19],[21],[36] 6.50%  
Investment, interest rate, paid in kind [4],[5],[19],[21],[36] 11.30%  
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Ordinary Shares    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at ending balance [4],[5],[12],[19] $ 0  
Investment owned, balance (in shares) [4],[5],[12],[19] 879  
Investment, Identifier [Axis]: Zeppelin Bidco Limited, Ordinary shares    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 0  
Gross Additions [44] 0  
Gross Reductions [45] 0  
Amount of Realized Gain (Loss) 0  
Amount of Unrealized Gain (Loss) 0  
Fair value at ending balance 0 0
Amount of Interest or Dividends Credited to Income [46] $ 0  
Investment owned, balance (in shares) 879  
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 [15],[16],[26] $ 3,465  
Fair value at ending balance $ 2,971 [19],[21],[27] $ 3,465 [15],[16],[26]
Basis spread on variable rate 5.00% [19],[21],[27] 5.00% [15],[16],[26]
Interest rate, cash 9.20% [19],[21],[27] 9.70% [15],[16],[26]
Investment, Identifier [Axis]: eShipping, LLC, Revolver    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [9],[15],[16],[26] $ 0  
Fair value at ending balance $ 99 [19],[21],[22],[27] $ 0 [9],[15],[16],[26]
Basis spread on variable rate 5.00% [19],[21],[22],[27] 5.00% [9],[15],[16],[26]
Interest rate, cash 9.20% [19],[21],[22],[27] 9.70% [9],[15],[16],[26]
Affiliate investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance $ 397,236 [7] $ 402,423
Gross Additions 32,051 [44] 51,189 [61]
Gross Reductions (13,658) [45] (43,028) [62]
Amount of Realized Gain (Loss) (4,833) (4,179)
Amount of Unrealized Gain (Loss) 2,693 (9,169)
Fair value at ending balance 413,489 [4] 397,236 [7]
Amount of Interest or Dividends Credited to Income 33,876 [46] 39,605 [63]
Affiliate investments | Biolam    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [77] 0  
Gross Additions [44],[77] 1,258  
Gross Reductions [45],[77] (53)  
Amount of Realized Gain (Loss) [77] 2  
Amount of Unrealized Gain (Loss) [77] 492  
Fair value at ending balance [77] 1,699 0
Amount of Interest or Dividends Credited to Income [46],[77] (27)  
Affiliate investments | Celebration Bidco, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [60] 17,676 18,391
Gross Additions 2,006 [44],[77] 200 [60],[61]
Gross Reductions 0 [45],[77] 0 [60],[62]
Amount of Realized Gain (Loss) 0 [77] 0 [60]
Amount of Unrealized Gain (Loss) (3,798) [77] (915) [60]
Fair value at ending balance 15,884 [77] 17,676 [60]
Amount of Interest or Dividends Credited to Income 728 [46],[77] 837 [60],[63]
Affiliate investments | Coastal Marina Holdings, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [60] 39,893 34,677
Gross Additions 104 [44],[77] 6,049 [60],[61]
Gross Reductions 0 [45],[77] 0 [60],[62]
Amount of Realized Gain (Loss) 0 [77] 0 [60]
Amount of Unrealized Gain (Loss) 3,160 [77] (833) [60]
Fair value at ending balance 43,157 [77] 39,893 [60]
Amount of Interest or Dividends Credited to Income 1,556 [46],[77] 2,139 [60],[63]
Affiliate investments | Eclipse Business Capital, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 151,491 [77] 155,889 [60]
Gross Additions 3,036 [44],[77] 27,728 [60],[61]
Gross Reductions (6,092) [45],[77] (23,091) [60],[62]
Amount of Realized Gain (Loss) 0 [77] 0 [60]
Amount of Unrealized Gain (Loss) 2,648 [77] (9,035) [60]
Fair value at ending balance [77] 151,083 151,491
Amount of Interest or Dividends Credited to Income 13,434 [46],[77] 16,034 [60],[63]
Affiliate investments | Hylan Datacom And Electrical LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [60] 0 10,449
Gross Additions [60],[61]   333
Gross Reductions [60],[62]   (9,637)
Amount of Realized Gain (Loss) [60]   (4,179)
Amount of Unrealized Gain (Loss) [60]   3,034
Fair value at ending balance [60]   0
Amount of Interest or Dividends Credited to Income [60],[63]   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 [44] 0 [61]
Gross Reductions 0 [45] 0 [62]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (1,923) (292)
Fair value at ending balance 38,838 40,761
Amount of Interest or Dividends Credited to Income 4,282 [46] 5,709 [63]
Affiliate investments | Rocade Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [60] 83,243 73,957
Gross Additions 6,576 [44],[77] 12,098 [60],[61]
Gross Reductions 0 [45],[77] (2,222) [60],[62]
Amount of Realized Gain (Loss) 0 [77] 0 [60]
Amount of Unrealized Gain (Loss) 938 [77] (590) [60]
Fair value at ending balance 90,757 [77] 83,243 [60]
Amount of Interest or Dividends Credited to Income 6,884 [46],[77] 8,598 [60],[63]
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 [44] 0 [61]
Gross Reductions 0 [45] 0 [62]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (3,115) 2,281
Fair value at ending balance 38,338 41,453
Amount of Interest or Dividends Credited to Income 5,353 [46] 2,225 [63]
Affiliate investments | Skyvault Holdings LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 4,781 [77] 0 [60]
Gross Additions 16,263 [44],[77] 4,781 [60],[61]
Gross Reductions (181) [45],[77] 0 [60],[62]
Amount of Realized Gain (Loss) 0 [77] 0 [60]
Amount of Unrealized Gain (Loss) (8) [77] 0 [60]
Fair value at ending balance [77] 20,855 4,781
Amount of Interest or Dividends Credited to Income 927 [46],[77] 36 [60],[63]
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 [44] 0 [61]
Gross Reductions (2,396) [45] (5,991) [62]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (44) (166)
Fair value at ending balance 4,768 7,208
Amount of Interest or Dividends Credited to Income 0 [46] 0 [63]
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 [44] 0 [61]
Gross Reductions (4,925) [45] (2,087) [62]
Amount of Realized Gain (Loss) 0 0
Amount of Unrealized Gain (Loss) (262) (2,653)
Fair value at ending balance 5,543 10,730
Amount of Interest or Dividends Credited to Income 745 [46] 3,535 [63]
Affiliate investments | Zeppelin Bidco Limited    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [77] 0  
Gross Additions [44],[77] 2,808  
Gross Reductions [45],[77] (11)  
Amount of Realized Gain (Loss) [77] (4,835)  
Amount of Unrealized Gain (Loss) [77] 4,605  
Fair value at ending balance [77] 2,567 0
Amount of Interest or Dividends Credited to Income [46],[77] (6)  
Control investments    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 79,663 [47] 90,920
Gross Additions 3,229 [51] 14,141 [52]
Gross Reductions (1,907) [53] (10,327) [54]
Amount of Realized Gain (Loss) (24,450) (845)
Amount of Unrealized Gain (Loss) 25,194 (14,226)
Fair value at ending balance 81,729 [70] 79,663 [47]
Amount of Interest or Dividends Credited to Income 3,976 [55] 2,613 [56]
Control investments | Black Angus Steakhouses, LLC    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 2,744 [78] 12,035 [49]
Gross Additions 0 [51],[78] 1,114 [49],[52]
Gross Reductions (610) [53],[78] 0 [49],[54]
Amount of Realized Gain (Loss) (17,109) [78] 0 [49]
Amount of Unrealized Gain (Loss) 14,975 [78] (10,405) [49]
Fair value at ending balance [78] 0 2,744
Amount of Interest or Dividends Credited to Income [49],[56]   1,028
Amount of Interest or Dividends Credited to Income [55],[78] (6)  
Control investments | MVC Automotive Group GmbH    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance [49] 13,741 25,192
Gross Additions 2,310 [51],[78] 10,340 [49],[52]
Gross Reductions (1,178) [53],[78] (9,620) [49],[54]
Amount of Realized Gain (Loss) 6 [78] (862) [49]
Amount of Unrealized Gain (Loss) (3,994) [78] (11,309) [49]
Fair value at ending balance 10,885 [78] 13,741 [49]
Amount of Interest or Dividends Credited to Income 56 [55],[78] 495 [49],[56]
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 [51] 0 [52]
Gross Reductions (116) [53] (695) [54]
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 [55] 48 [56]
Control investments | Security Holdings B.V.    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]    
Fair value at beginning balance 63,167 [78] 52,688 [49]
Gross Additions 919 [51],[78] 2,687 [49],[52]
Gross Reductions (3) [53],[78] (12) [49],[54]
Amount of Realized Gain (Loss) 2 [78] 17 [49]
Amount of Unrealized Gain (Loss) 6,759 [78] 7,787 [49]
Fair value at ending balance [78] 70,844 63,167
Amount of Interest or Dividends Credited to Income $ 3,926 [55],[78] $ 1,042 [49],[56]
[1] All of the investment is or will be encumbered as security for the Company’s $0.8 billion February 2019 Credit Facility with ING.
[2] All of the investment is or will be encumbered as security for the Company’s $0.7 billion senior secured credit facility with ING Capital LLC (“ING”) initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[3] Portfolio company does not issue shares or units; member interest is based on commitments.
[4] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of the portfolio company as the Company owns between 5% or more, up to 25% (inclusive), of the portfolio company’s voting securities (“non-controlled affiliate”). Transactions related to investments in non-controlled “Affiliate Investments” for the nine months ended September 30, 2025 were as follows:
December 31, 2024
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)September 30,
2025
 Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Biolam(d)
First Lien Senior Secured Term Loan (EURIBOR + 4.50%, 12.5% PIK)(e)
$— $1,258 $(53)$$492 $1,699 $(27)
Common Stock
(851,507 shares)
— — — — — — — 
Convertible Bonds
(1,586,655 shares)
— — — — — — — 
Ordinary Shares
(15,191,001 shares)
— — — — — — — 
Preferred Stock A
(41,692 shares)
— — — — — — — 
Preferred Stock A2
(13,538 shares)
— — — — — — — 
Preferred Stock B
(1,529,216 shares)
— — — — — — — 
Preferred Stock C
(11,153 shares)
— — — — — — — 
Preferred Stock O1
(1,336,662 shares)
— — — — — — — 
Preferred Stock O2
(134,616 shares)
— — — — — — — 
Warrants (2,600,000 units)
— — — — — — — 
— 1,258 (53)492 1,699 (27)
Celebration Bidco, LLC(d)
First Lien Senior Secured Term Loan (SOFR + 8.00%, 12.3% PIK)
6,414 619 — — (281)6,752 618 
First Lien Senior Secured Term Loan (SOFR + 8.00%, 12.3% PIK)
— 1,387 — — — 1,387 111 
Common Stock
(1,243,071 shares)
11,262 — — — (3,517)7,745 — 
17,676 2,006 — — (3,798)15,884 728 
Coastal Marina Holdings, LLC(d)
Subordinated Term Loan
(8.0% Cash)
15,770 76 — — 15 15,861 1,070 
Subordinated Term Loan
(8.0% Cash)
7,271 28 — — 14 7,313 486 
LLC Units (3,518,097 units)
16,852 — — — 3,131 19,983 — 
39,893 104 — — 3,160 43,157 1,556 
December 31, 2024
Value
Gross Additions
(a)
Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)September 30,
2025
 Value
Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Eclipse Business Capital, LLC(d)
Revolver (SOFR + 6.50%, 10.8% Cash)
$10,091 $3,009 $(6,092)$— $(8)$7,000 $849 
Second Lien Senior Secured Term Loan (7.5% Cash)
4,545 — — (5)4,545 264 
LLC units (89,447,396 units)
136,855 22 — — 2,661 139,538 12,321 
151,491 3,036 (6,092)— 2,648 151,083 13,434 
Jocassee Partners LLC
9.1% Member Interest
40,761 — — — (1,923)38,838 4,282 
40,761 — — — (1,923)38,838 4,282 
Rocade Holdings LLC(d)
Preferred LP Units (71,000 units) (SOFR + 6.00%, 10.3% PIK)
83,000 6,576 — — (17)89,559 6,576 
Common LP Units (23.8 units)
243 — — — 955 1,198 308 
83,243 6,576 — — 938 90,757 6,884 
Sierra Senior Loan Strategy JV I LLC
89.01% Member Interest
41,453 — — — (3,115)38,338 5,353 
41,453 — — — (3,115)38,338 5,353 
Skyvault Holdings LLC(d)
First Lien Senior Secured Term Loan (12.0% Cash)
3,586 12,236 (181)— — 15,641 927 
LLC Units (4,046,326.8 units)
1,195 4,027 — — (8)5,214 — 
4,781 16,263 (181)— (8)20,855 927 
Thompson Rivers LLC
16.0% Member Interest
7,208 — (2,396)— (44)4,768 — 
7,208 — (2,396)— (44)4,768 — 
Waccamaw River LLC
20% Member Interest
10,730 — (4,925)— (262)5,543 745 
10,730 — (4,925)— (262)5,543 745 
Zeppelin Bidco Limited(d)
First Lien Senior Secured Term Loan (SOFR + 6.50%, 11.3% PIK)
— 2,503 (11)(4,329)4,131 2,294 (6)
First Lien Senior Secured Term Loan (SOFR + 6.50%, 11.3% PIK)
— 305 (506)474 273 — 
Ordinary Shares (879 shares)
— — — — — — — 
— 2,808 (11)(4,835)4,605 2,567 (6)
Total Affiliate Investments$397,236 $32,051 $(13,658)$(4,833)$2,693 $413,489 $33,876 
(a)     Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)    Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c) Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Affiliate category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment
[5] Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 24.1% of total investments at fair value as of September 30, 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).
[6] Portfolio company does not issue shares or units; member interest is based on commitments.
[7] 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.
[8] 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).
[9] Position or portion thereof is an unfunded loan or equity commitment.
[10] 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.
[11] 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.
[12] Investment is non-income producing.
[13] Investment is non-income producing.
[14] The interest rate on these loans is subject to 3 Month SOFR, which as of December 31, 2024 was 4.30510%.
[15] Debt investment includes interest rate floor feature.
[16] The fair value of the investment was determined using significant unobservable inputs.
[17] PIK non-accrual investment.
[18] PIK non-accrual investment.
[19] The fair value of the investment was determined using significant unobservable inputs.
[20] The interest rate on these loans is subject to 3 Month SOFR, which as of September 30, 2025 was 3.97639%.
[21] Debt investment includes interest rate floor feature.
[22] Position or portion thereof is an unfunded loan or equity commitment.
[23] The interest rate on these loans is subject to 3 Month EURIBOR, which as of December 31, 2024 was 2.71400%.
[24] The interest rate on these loans is subject to 3 Month EURIBOR, which as of September 30, 2025 was 2.03200%.
[25] The interest rate on these loans is subject to 6 Month BBSY, which as of December 31, 2024 was 4.49250%.
[26] The interest rate on these loans is subject to 1 Month SOFR, which as of December 31, 2024 was 4.33249%.
[27] The interest rate on these loans is subject to 1 Month SOFR, which as of September 30, 2025 was 4.12920%.
[28] The interest rate on these loans is subject to 6 Month SOFR, which as of December 31, 2024 was 4.25001%.
[29] The interest rate on these loans is subject to 6 Month EURIBOR, which as of December 31, 2024 was 2.56800%.
[30] Non-accrual investment.
[31] The interest rate on these loans is subject to 1 Month SONIA, which as of September 30, 2025 was 3.97500%.
[32] The interest rate on these loans is subject to 6 Month EURIBOR, which as of September 30, 2025 was 2.09600%.
[33] The interest rate on these loans is subject to 3 Month SONIA, which as of December 31, 2024 was 4.62330%.
[34] The interest rate on these loans is subject to 3 Month SONIA, which as of September 30, 2025 was 3.97260%.
[35] The interest rate on these loans is subject to 6 Month SONIA, which as of December 31, 2024 was 4.56370%.
[36] The interest rate on these loans is subject to 6 Month SONIA, which as of September 30, 2025 was 3.93900%.
[37] The interest rate on these loans is subject to 6 Month SOFR, which as of September 30, 2025 was 3.84590%.
[38] The interest rate on these loans is subject to 3 Month BBSY, which as of December 31, 2024 was 4.41630%.
[39] The interest rate on these loans is subject to 3 Month BBSY, which as of September 30, 2025 was 3.57640%.
[40] The interest rate on these loans is subject to 1 Month EURIBOR, which as of December 31, 2024 was 2.84500%.
[41] The interest rate on these loans is subject to 1 Month EURIBOR, which as of September 30, 2025 was 1.92900%.
[42] The interest rate on these loans is subject to 3 Month STIBOR, which as of December 31, 2024 was 2.54200%.
[43] Non-accrual investment.
[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] 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.
[47] 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.
[48] Non-accrual investment.
[49] The fair value of the investment was determined using significant unobservable inputs.
[50] Non-accrual investment.
[51] 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.
[52] 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.
[53] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[54] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[55] 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.
[56] 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.
[57] The interest rate on these loans is subject to 1 Month SONIA, which as of December 31, 2024 was 4.71030%.
[58] The interest rate on these loans is subject to 3 Month CORRA, which as of December 31, 2024 was 3.15158%.
[59] The interest rate on these loans is subject to 3 Month CORRA, which as of September 30, 2025 was 2.56000%.
[60] The fair value of the investment was determined using significant unobservable inputs.
[61] 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.
[62] Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
[63] 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.
[64] The interest rate on these loans is subject to 3 Month BKBM, which as of December 31, 2024 was 4.27000%.
[65] The interest rate on these loans is subject to 3 Month BKBM, which as of September 30, 2025 was 2.93000%.
[66] The interest rate on these loans is subject to 6 Month SARON, which as of December 31, 2024 was 1.01720%.
[67] The interest rate on these loans is subject to 3 Month SARON, which as of September 30, 2025 was -0.04090%
[68] 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.
[69] Investment was purchased from MVC Capital, Inc. (“MVC”) in connection with the MVC Acquisition (as defined in “Note 2 - Agreements and Related Party Transactions”).
[70] 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 for the nine months ended September 30, 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)September 30,
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 $— $(610)$(7,481)$5,347 $— $(6)
First Lien Senior Secured Term Loan (10.0% PIK)(e)
— — — (9,628)9,628 — — 
LLC Units (44.6 units)
— — — — — — — 
2,744 — (610)(17,109)14,975 — (6)
MVC Automotive Group GmbH(d)
First Lien Senior Secured Term Loan (7.0% Cash)
— 2,310 (1,178)34 1,172 56 
Common Equity Interest (18,000 Shares)
13,741 — — — (4,028)9,713 — 
13,741 2,310 (1,178)(3,994)10,885 56 
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)
6,655 168 — — — 6,823 254 
Revolver (6.0% PIK)
5,333 165 (3)730 6,227 283 
Senior Subordinated Term Loan (3.1% PIK)
11,191 352 — — — 11,543 268 
Senior Unsecured Term Loan (9.0% PIK)
2,293 234 — — 318 2,845 304 
Common Stock Series A (17,100 shares)
399 — — — 61 460 — 
Common Stock Series B (1,236 shares)
37,296 — — — 5,650 42,946 2,817 
63,167 919 (3)6,759 70,844 3,926 
Total Control Investments$79,663 $3,229 $(1,907)$(24,450)$25,194 $81,729 $3,976 
(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.
[71] The interest rate on these loans is subject to 1 Month NIBOR, which as of December 31, 2024 was 4.61000%.
[72] The interest rate on these loans is subject to 1 Month NIBOR, which as of September 30, 2025 was 4.04000%.
[73] The interest rate on these loans is subject to 1 Month BBSY, which as of September 30, 2025 was 3.53630%.
[74] The interest rate on these loans is subject to 1 Month BBSY, which as of December 31, 2024 was 4.32250%.
[75] The interest rate on these loans is subject to 6 Month SARON, which as of September 30, 2025 was -0.04508%.
[76] The interest rate on these loans is subject to 3 Month STIBOR, which as of September 30, 2025 was 1.88600%.
[77] The fair value of the investment was determined using significant unobservable inputs.
[78] The fair value of the investment was determined using significant unobservable inputs.