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Consolidated Schedule of Investments (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Schedule of Investments [Line Items]          
Basis spread, variable rate [1],[2],[3],[4],[5]         7.00%
Unrealized gain (loss) for U.S. federal income tax purposes $ (52,500,000)   $ (52,500,000)   $ (126,200,000)
Net change in unrealized gain (loss)     85,668,000 $ (238,306,000)  
Cost for income tax purposes 12,900,000,000   12,900,000,000   13,100,000,000
Unrealized loss for U.S. federal income tax purposes 341,800,000   341,800,000   382,200,000
Unrealized gain for U.S. federal income tax purposes 289,300,000   289,300,000   256,000,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [6],[7],[8]     13,010,345,000    
Net change in unrealized gain (loss)     85,668,000 (238,306,000)  
Ending balance 12,892,943,000   12,892,943,000   13,010,345,000 [6],[7],[8]
Restricted investments, fair value $ 1,900,000,000   $ 1,900,000,000   $ 1,600,000,000
Restricted investments as a percentage of net assets 31.90%   31.90%   27.60%
Non-qualifying assets as a percent of total assets 13.60%   13.60%   13.50%
Non-qualifying asset, fair value $ 9,900,000   $ 9,900,000   $ 9,100,000
Non-controlled, affiliated investments          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss) (4,000) $ 0 (5,000) 0 (49,000)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,175,000 0 0
Gross Additions     15,045,000 [9]   6,224,000 [10]
Gross Reductions     (1,589,000) [11]   0 [12]
Net change in unrealized gain (loss) (4,000) 0 (5,000) 0 (49,000)
Ending balance 19,626,000   19,626,000   6,175,000
Interest income     0   0
Dividend income 177,000 0 177,000 0 0
Other income     0   0
Investment income from controlled, affiliated investments:          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss) 6,127,000 (3,636,000) 16,381,000 (15,394,000) 45,602,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     993,801,000 616,780,000 616,780,000
Gross Additions     339,417,000 [13]   417,754,000 [14]
Gross Reductions     (26,845,000) [15]   (86,335,000) [16]
Net change in unrealized gain (loss) 6,127,000 (3,636,000) 16,381,000 (15,394,000) 45,602,000
Ending balance 1,322,754,000   1,322,754,000   993,801,000
Interest income     8,227,000   8,206,000
Dividend income 20,662,000 23,195,000 42,688,000 38,833,000 77,047,000
Other income $ 186,000 $ 163,000 $ 578,000 325,000 $ 689,000
Investment, Identifier [Axis]: 3ES Innovation Inc. (dba Aucerna), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18],[19]   6.50% [17],[18],[19]   6.50% [2],[3],[5],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[20]     $ 60,332,000    
Ending balance $ 60,323,000 [17],[18],[19]   $ 60,323,000 [17],[18],[19]   $ 60,332,000 [2],[3],[5],[20]
Investment, Identifier [Axis]: 3ES Innovation Inc. (dba Aucerna), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[19],[21],[22]   6.50% [17],[19],[21],[22]   6.50% [2],[3],[5],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[20],[23]     $ 1,681,000    
Ending balance $ 1,700,000 [17],[19],[21],[22]   1,700,000 [17],[19],[21],[22]   $ 1,681,000 [2],[3],[5],[20],[23]
Investment, Identifier [Axis]: AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     36,000 [24]   (5,000) [25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0 [24] 0 [25] 0 [25]
Gross Additions     6,115,000 [13],[24]   5,000 [14],[25]
Gross Reductions     (35,000) [15],[24]   0 [16],[25]
Net change in unrealized gain (loss)     36,000 [24]   (5,000) [25]
Ending balance [24] 6,116,000   6,116,000   0
Interest income     0 [24]   0 [25]
Dividend income     0 [24]   0 [25]
Other income     0 [24]   0 [25]
Investment, Identifier [Axis]: AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC, LLC Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[23],[26],[27],[28]     0    
Ending balance 6,116,000 [19],[21],[29],[30],[31],[32]   6,116,000 [19],[21],[29],[30],[31],[32]   0 [3],[5],[23],[26],[27],[28]
Investment, Identifier [Axis]: AAM Series 2.1 Aviation Feeder, LLC          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     0 [24]   (6,000) [25]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     1,568,000 [24] 0 [25] 0 [25]
Gross Additions     17,376,000 [13],[24]   1,574,000 [14],[25]
Gross Reductions     0 [15],[24]   0 [16],[25]
Net change in unrealized gain (loss)     0 [24]   (6,000) [25]
Ending balance [24] 18,944,000   18,944,000   1,568,000
Interest income     0 [24]   0 [25]
Dividend income     0 [24]   0 [25]
Other income     0 [24]   0 [25]
Investment, Identifier [Axis]: AAM Series 2.1 Aviation Feeder, LLC, LLC Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[23],[26],[27],[28]     1,568,000    
Ending balance $ 18,944,000 [19],[21],[29],[30],[31],[32]   $ 18,944,000 [19],[21],[29],[30],[31],[32]   $ 1,568,000 [3],[5],[23],[26],[27],[28]
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [17],[18]   7.50% [17],[18]   7.50% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 67,247,000    
Ending balance $ 62,187,000 [17],[18]   62,187,000 [17],[18]   $ 67,247,000 [2],[3],[4]
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[4],[23]         7.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4],[23]     6,704,000    
Ending balance [2],[3],[4],[23]         $ 6,704,000
Investment, Identifier [Axis]: ASP Conair Holdings LP, Class A Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     5,444,000    
Ending balance $ 5,736,000 [17],[30],[32]   $ 5,736,000 [17],[30],[32]   $ 5,444,000 [3],[27],[28]
Investment, Identifier [Axis]: Accela, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [22]   7.50% [22]   7.50% [2],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[33]     $ 27,521,000    
Ending balance $ 28,064,000 [22]   $ 28,064,000 [22]   $ 27,521,000 [2],[33]
Investment, Identifier [Axis]: Accela, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [21],[34]   7.50% [21],[34]   7.00% [2],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[23]     $ (30,000)    
Ending balance $ (15,000) [21],[34]   (15,000) [21],[34]   $ (30,000) [2],[23]
Investment, Identifier [Axis]: Accelerate Topco Holdings, LLC, Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[30],[32] $ 15,000   15,000    
Investment, Identifier [Axis]: Accelerate topco Holdings, LLC, Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     $ 14,000    
Ending balance [3],[27],[28]         $ 14,000
Investment, Identifier [Axis]: Access CIG, LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.75% [17],[22]   7.75% [17],[22]   7.75% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 58,465,000    
Ending balance $ 58,613,000 [17],[22]   $ 58,613,000 [17],[22]   $ 58,465,000 [2],[3],[33]
Investment, Identifier [Axis]: Adenza Group, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[34],[35] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[34],[35] $ 0   $ 0    
Investment, Identifier [Axis]: Adenza Group, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[22] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22] $ 199,718,000   $ 199,718,000    
Investment, Identifier [Axis]: Adenza Group, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[34] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[34] $ 0   $ 0    
Investment, Identifier [Axis]: Alera Group, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[22]   6.00% [17],[22]   6.00% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 34,552,000    
Ending balance $ 34,638,000 [17],[22]   $ 34,638,000 [17],[22]   $ 34,552,000 [2],[3],[36]
Investment, Identifier [Axis]: AmSpec Group, Inc. (fka AmSpec Services Inc.), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[37]   5.75% [17],[37]   5.75% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 108,306,000    
Ending balance $ 108,556,000 [17],[37]   $ 108,556,000 [17],[37]   $ 108,306,000 [2],[3],[20]
Investment, Identifier [Axis]: AmSpec Group, Inc. (fka AmSpec Services Inc.), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 3.75% [17],[21],[38]   3.75% [17],[21],[38]   4.75% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 2,965,000    
Ending balance $ 7,428,000 [17],[21],[38]   7,428,000 [17],[21],[38]   $ 2,965,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Amergin Asset Management, LLC, Class A Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     0    
Ending balance $ 0 [17],[19],[30],[32]   $ 0 [17],[19],[30],[32]   $ 0 [3],[5],[27],[28]
Investment, Identifier [Axis]: AmeriLife Holdings LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[35],[39]   5.75% [17],[21],[35],[39]   5.75% [2],[3],[23],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[41]     $ 119,000    
Ending balance $ 119,000 [17],[21],[35],[39]   $ 119,000 [17],[21],[35],[39]   $ 119,000 [2],[3],[23],[40],[41]
Investment, Identifier [Axis]: AmeriLife Holdings LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[39]   5.75% [17],[39]   5.75% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 715,000    
Ending balance $ 716,000 [17],[39]   $ 716,000 [17],[39]   $ 715,000 [2],[3],[42]
Investment, Identifier [Axis]: AmeriLife Holdings LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[39]   5.75% [17],[21],[39]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (2,000)    
Ending balance $ 14,000 [17],[21],[39]   $ 14,000 [17],[21],[39]   $ (2,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Anaplan, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[22]   6.50% [17],[22]   6.50% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 134,744,000    
Ending balance $ 135,082,000 [17],[22]   $ 135,082,000 [17],[22]   $ 134,744,000 [2],[3],[36]
Investment, Identifier [Axis]: Anaplan, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[34]   6.50% [17],[21],[34]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (24,000)    
Ending balance $ 0 [17],[21],[34]   $ 0 [17],[21],[34]   $ (24,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Apex Group Treasury LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[19],[44] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[19],[44] $ 43,375,000   $ 43,375,000    
Investment, Identifier [Axis]: Apex Group Treasury, LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[5],[20]         6.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[20]     41,940,000    
Ending balance [2],[3],[5],[20]         $ 41,940,000
Investment, Identifier [Axis]: Apex Service Partners Intermediate 2, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[45]         12.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[45]     47,666,000    
Ending balance $ 52,663,000 [17],[46]   52,663,000 [17],[46]   $ 47,666,000 [3],[45]
Investment, Identifier [Axis]: Apex Service Partners, LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[40],[41]         5.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[40],[41]     $ 989,000    
Ending balance [2],[3],[40],[41]         $ 989,000
Investment, Identifier [Axis]: Apex Service Partners, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[18] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[18] $ 987,000   $ 987,000    
Investment, Identifier [Axis]: Apex Service Partners, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[21]   5.25% [17],[21]   5.25% [2],[3],[23],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[41]     $ 31,000    
Ending balance $ 0 [17],[21]   $ 0 [17],[21]   $ 31,000 [2],[3],[23],[41]
Investment, Identifier [Axis]: Apptio, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[44]   5.00% [17],[44]   6.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 50,916,000    
Ending balance $ 50,916,000 [17],[44]   $ 50,916,000 [17],[44]   $ 50,916,000 [2],[3],[20]
Investment, Identifier [Axis]: Apptio, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[21],[44]   5.00% [17],[21],[44]   6.00% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 1,667,000    
Ending balance $ 834,000 [17],[21],[44]   $ 834,000 [17],[21],[44]   $ 1,667,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Aptive Environmental, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 12.00% [31],[46]   12.00% [31],[46]   12.00% [3],[45]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[45]     $ 11,005,000    
Ending balance $ 11,877,000 [17],[46]   11,877,000 [17],[46]   $ 11,005,000 [3],[45]
Investment, Identifier [Axis]: Aramsco, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33]         5.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     55,183,000    
Ending balance [2],[3],[33]         $ 55,183,000
Investment, Identifier [Axis]: Aramsco, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[33]         5.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 1,655,000    
Ending balance [2],[3],[23],[33]         $ 1,655,000
Investment, Identifier [Axis]: Ardonagh Midco 2 PLC, Unsecured notes          
Schedule of Investments [Line Items]          
Basis spread, variable rate 11.50% [19],[31],[46],[47]   11.50% [19],[31],[46],[47]   11.50% [3],[5],[45],[48]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[45],[48]     $ 10,579,000    
Ending balance $ 10,970,000 [17],[19],[46],[47]   $ 10,970,000 [17],[19],[46],[47]   $ 10,579,000 [3],[5],[45],[48]
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, First lien senior secured EUR term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.25% [17],[19],[49]   7.25% [17],[19],[49]   7.00% [2],[3],[5],[50]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[50]     $ 9,724,000    
Ending balance $ 9,966,000 [17],[19],[49]   $ 9,966,000 [17],[19],[49]   $ 9,724,000 [2],[3],[5],[50]
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, First lien senior secured GBP delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[19],[49]   5.75% [17],[19],[49]   5.75% [2],[3],[5],[40],[51]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[40],[51]     $ 9,729,000    
Ending balance $ 10,309,000 [17],[19],[49]   $ 10,309,000 [17],[19],[49]   $ 9,729,000 [2],[3],[5],[40],[51]
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, First lien senior secured GBP term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.25% [17],[19],[52]   7.25% [17],[19],[52]   7.00% [2],[3],[5],[53]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[53]     $ 104,242,000    
Ending balance $ 110,173,000 [17],[19],[52]   $ 110,173,000 [17],[19],[52]   $ 104,242,000 [2],[3],[5],[53]
Investment, Identifier [Axis]: Ardonagh Midco 3 PLC, First lien senior secured USD term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[19],[39]   6.00% [17],[19],[39]   5.75% [2],[3],[4],[5]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4],[5]     $ 26,583,000    
Ending balance $ 26,650,000 [17],[19],[39]   $ 26,650,000 [17],[19],[39]   $ 26,583,000 [2],[3],[4],[5]
Investment, Identifier [Axis]: Armstrong Bidco Limited (dba The Access Group), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[19],[21],[35],[52]   5.25% [17],[19],[21],[35],[52]   5.25% [2],[3],[5],[23],[40],[53]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[23],[40],[53]     $ 935,000    
Ending balance $ 1,125,000 [17],[19],[21],[35],[52]   $ 1,125,000 [17],[19],[21],[35],[52]   $ 935,000 [2],[3],[5],[23],[40],[53]
Investment, Identifier [Axis]: Armstrong Bidco Limited (dba The Access Group), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[19],[52]   5.25% [17],[19],[52]   5.25% [2],[3],[5],[53]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[53]     $ 2,310,000    
Ending balance $ 2,454,000 [17],[19],[52]   $ 2,454,000 [17],[19],[52]   $ 2,310,000 [2],[3],[5],[53]
Investment, Identifier [Axis]: Aruba Investments Holdings LLC (dba Angus Chemical Company), Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.75% [17],[54]   7.75% [17],[54]   7.75% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 9,850,000    
Ending balance $ 8,800,000 [17],[54]   $ 8,800,000 [17],[54]   $ 9,850,000 [2],[3],[33]
Investment, Identifier [Axis]: Ascend Buyer, LLC (dba PPC Flexible Packaging), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.40% [17],[18]   6.40% [17],[18]   6.25% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 5,457,000    
Ending balance $ 5,470,000 [17],[18]   $ 5,470,000 [17],[18]   $ 5,457,000 [2],[3],[36]
Investment, Identifier [Axis]: Ascend Buyer, LLC (dba PPC Flexible Packaging), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.40% [17],[21],[34]   6.40% [17],[21],[34]   6.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (4,000)    
Ending balance $ 0 [17],[21],[34]   0 [17],[21],[34]   $ (4,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Associations Finance, Inc., Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         12.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     55,641,000    
Ending balance $ 59,631,000 [17],[32],[46]   $ 59,631,000 [17],[32],[46]   $ 55,641,000 [3],[28],[45]
Investment, Identifier [Axis]: Associations, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [18],[21],[31],[35]   6.50% [18],[21],[31],[35]   6.50% [2],[3],[23],[40],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[42]     $ 3,590,000    
Ending balance $ 31,870,000 [17],[18],[21],[35]   $ 31,870,000 [17],[18],[21],[35]   $ 3,590,000 [2],[3],[23],[40],[42]
Investment, Identifier [Axis]: Associations, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18]   6.50% [17],[18]   6.50% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 385,414,000    
Ending balance $ 358,569,000 [17],[18]   $ 358,569,000 [17],[18]   $ 385,414,000 [2],[3],[42]
Investment, Identifier [Axis]: Associations, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[34]   6.50% [17],[21],[34]   4.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (82,000)    
Ending balance $ (247,000) [17],[21],[34]   $ (247,000) [17],[21],[34]   $ (82,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Aviation Solutions Midco, LLC (dba STS Aviation), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.25% [17],[22]   7.25% [17],[22]   7.25% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 205,233,000    
Ending balance $ 210,636,000 [17],[22]   210,636,000 [17],[22]   $ 205,233,000 [2],[3],[20]
Investment, Identifier [Axis]: AxiomSL Group, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40],[43]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     (42,000)    
Ending balance [2],[3],[23],[40],[43]         $ (42,000)
Investment, Identifier [Axis]: AxiomSL Group, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     197,726,000    
Ending balance [2],[3],[33]         $ 197,726,000
Investment, Identifier [Axis]: AxiomSL Group, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[43]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (273,000)    
Ending balance [2],[3],[23],[43]         $ (273,000)
Investment, Identifier [Axis]: BCPE Nucleon (DE) SPV, LP, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[19],[37]   7.00% [17],[19],[37]   7.00% [2],[3],[4],[5]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4],[5]     $ 189,303,000    
Ending balance $ 189,778,000 [17],[19],[37]   $ 189,778,000 [17],[19],[37]   $ 189,303,000 [2],[3],[4],[5]
Investment, Identifier [Axis]: BCPE Osprey Buyer, Inc. (dba PartsSource), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34],[35]   5.75% [17],[21],[34],[35]   5.75% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (315,000)    
Ending balance $ (175,000) [17],[21],[34],[35]   $ (175,000) [17],[21],[34],[35]   $ (315,000) [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: BCPE Osprey Buyer, Inc. (dba PartsSource), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[44]   5.75% [17],[44]   5.75% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 110,371,000    
Ending balance $ 110,375,000 [17],[44]   $ 110,375,000 [17],[44]   $ 110,371,000 [2],[3],[20]
Investment, Identifier [Axis]: BCPE Osprey Buyer, Inc. (dba PartsSource), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[44]   5.75% [17],[21],[44]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (267,000)    
Ending balance $ 4,271,000 [17],[21],[44]   $ 4,271,000 [17],[21],[44]   $ (267,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: BCPE Watson (DE) ORML, LP, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[19],[39],[55]   6.50% [17],[19],[39],[55]   6.50% [1],[2],[3],[5],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[2],[3],[5],[41]     $ 14,850,000    
Ending balance $ 14,925,000 [17],[19],[39],[55]   14,925,000 [17],[19],[39],[55]   $ 14,850,000 [1],[2],[3],[5],[41]
Investment, Identifier [Axis]: BCTO BSI Buyer, Inc. (dba Buildertrend), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[42]         8.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     52,752,000    
Ending balance $ 55,101,000 [17],[18]   $ 55,101,000 [17],[18]   $ 52,752,000 [2],[3],[42]
Investment, Identifier [Axis]: BCTO BSI Buyer, Inc. (dba Buildertrend), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[21],[34]   7.00% [17],[21],[34]   8.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ 0 [17],[21],[34]   0 [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: BCTO WIW Holdings, Inc. (dba When I Work), Class A Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     1,171,000    
Ending balance 1,171,000 [17],[30],[32]   1,171,000 [17],[30],[32]   1,171,000 [3],[27],[28]
Investment, Identifier [Axis]: BEHP Co-Investor II, L.P., LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     1,270,000    
Ending balance $ 1,325,000 [17],[19],[30],[32]   1,325,000 [17],[19],[30],[32]   $ 1,270,000 [3],[5],[27],[28]
Investment, Identifier [Axis]: BP Veraison Buyer, LLC (dba Sun World), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40],[43]         5.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ 0    
Ending balance [2],[3],[23],[40],[43]         $ 0
Investment, Identifier [Axis]: BP Veraison Buyer, LLC (dba Sun World), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18]   5.50% [17],[18]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 68,169,000    
Ending balance $ 67,993,000 [17],[18]   $ 67,993,000 [17],[18]   $ 68,169,000 [2],[3],[20]
Investment, Identifier [Axis]: BP Veraison Buyer, LLC (dba Sun World), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[21],[34]   5.50% [17],[21],[34]   5.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (65,000)    
Ending balance $ (44,000) [17],[21],[34]   $ (44,000) [17],[21],[34]   $ (65,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Balrog Acquisition, Inc. (dba Bakemark), Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[18]   7.00% [17],[18]   7.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 21,780,000    
Ending balance $ 21,780,000 [17],[18]   21,780,000 [17],[18]   $ 21,780,000 [2],[3],[20]
Investment, Identifier [Axis]: Bayshore Intermediate #2, L.P. (dba Boomi), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33]         7.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     90,973,000    
Ending balance $ 97,530,000 [17],[18]   $ 97,530,000 [17],[18]   $ 90,973,000 [2],[3],[33]
Investment, Identifier [Axis]: Bayshore Intermediate #2, L.P. (dba Boomi), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18],[21]   6.50% [17],[18],[21]   6.75% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 2,168,000    
Ending balance $ 1,280,000 [17],[18],[21]   $ 1,280,000 [17],[18],[21]   $ 2,168,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: Blackhawk Network Holdings, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[44]   7.00% [17],[44]   7.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 105,869,000    
Ending balance $ 106,134,000 [17],[44]   106,134,000 [17],[44]   $ 105,869,000 [2],[3],[20]
Investment, Identifier [Axis]: Blend Labs, Inc., Common stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[56]     104,000    
Ending balance $ 68,000 [17],[30],[57]   $ 68,000 [17],[30],[57]   $ 104,000 [3],[27],[56]
Investment, Identifier [Axis]: Blend Labs, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [17],[22]   7.50% [17],[22]   7.50% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 66,319,000    
Ending balance $ 65,813,000 [17],[22]   $ 65,813,000 [17],[22]   $ 66,319,000 [2],[3],[36]
Investment, Identifier [Axis]: Blend Labs, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [17],[21],[34]   7.50% [17],[21],[34]   7.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (131,000)    
Ending balance $ (188,000) [17],[21],[34]   (188,000) [17],[21],[34]   $ (131,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Blend Labs, Inc., Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     5,000    
Ending balance 1,000 [17],[30],[32]   1,000 [17],[30],[32]   5,000 [3],[27],[28]
Investment, Identifier [Axis]: Blue Owl Capital Corporation Senior Loan Fund LLC (fka ORCC Senior Loan Fund LLC)(c)          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss) [58]     8,947,000    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [58]     288,981,000    
Gross Additions [13],[58]     75,250,000    
Gross Reductions [15],[58]     (8,750,000)    
Net change in unrealized gain (loss) [58]     8,947,000    
Ending balance [58] 364,428,000   364,428,000   $ 288,981,000
Interest income [58]     0    
Dividend income [58]     20,659,000    
Other income [58]     0    
Investment, Identifier [Axis]: Blue Owl Capital Corporation Senior Loan Fund LLC (fka ORCC Senior Loan Fund LLC), LLC Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [19],[29],[32],[55],[59] $ 364,428,000   364,428,000    
Investment, Identifier [Axis]: Bracket Intermediate Holding Corp., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         4.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     487,000    
Ending balance [2],[3],[20]         $ 487,000
Investment, Identifier [Axis]: Bracket Intermediate Holding Corp., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         8.13%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 25,200,000    
Ending balance [2],[3],[20]         $ 25,200,000
Investment, Identifier [Axis]: BradyIFS Holdings, LLC (fka Individual Foodservice Holdings, LLC), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18]   6.25% [17],[18]   6.25% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 133,104,000    
Ending balance $ 132,753,000 [17],[18]   $ 132,753,000 [17],[18]   $ 133,104,000 [2],[3],[42]
Investment, Identifier [Axis]: BradyIFS Holdings, LLC (fka Individual Foodservice Holdings, LLC), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18],[21]   6.25% [17],[18],[21]   6.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (54,000)    
Ending balance $ 2,277,000 [17],[18],[21]   $ 2,277,000 [17],[18],[21]   $ (54,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Brightway Holdings, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18]   6.50% [17],[18]   6.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 26,108,000    
Ending balance $ 25,976,000 [17],[18]   $ 25,976,000 [17],[18]   $ 26,108,000 [2],[3],[33]
Investment, Identifier [Axis]: Brightway Holdings, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18],[21]   6.50% [17],[18],[21]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (63,000)    
Ending balance $ 1,516,000 [17],[18],[21]   1,516,000 [17],[18],[21]   $ (63,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Brooklyn Lender Co-Invest 2, L.P. (dba Boomi), Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     7,378,000    
Ending balance 7,707,000 [17],[30],[32]   7,707,000 [17],[30],[32]   7,378,000 [3],[27],[28]
Investment, Identifier [Axis]: CD&R Value Building Partners I, L.P. (dba Belron), LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     33,955,000    
Ending balance $ 35,154,000 [17],[19],[30],[32]   $ 35,154,000 [17],[19],[30],[32]   $ 33,955,000 [3],[5],[27],[28]
Investment, Identifier [Axis]: CIBT Global, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[18],[60]   5.25% [17],[18],[60]   5.25% [2],[3],[20],[61]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[61]     $ 470,000    
Ending balance $ 582,000 [17],[18],[60]   582,000 [17],[18],[60]   $ 470,000 [2],[3],[20],[61]
Investment, Identifier [Axis]: CIBT Global, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20],[61]         7.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[61]     6,048,000    
Ending balance 6,049,000 [17],[18],[60]   6,049,000 [17],[18],[60]   $ 6,048,000 [2],[3],[20],[61]
Investment, Identifier [Axis]: CP PIK DEBT ISSUER, LLC (dba CivicPlus, LLC), Unsecured notes          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[41]         11.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[41]     17,569,000    
Ending balance $ 19,489,000 [17],[39]   $ 19,489,000 [17],[39]   $ 17,569,000 [2],[3],[41]
Investment, Identifier [Axis]: CSC MKG Topco LLC (dba Medical Knowledge Group), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[22] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22] $ 1,249,000   $ 1,249,000    
Investment, Identifier [Axis]: CSC Mkg Topco LLC (dba Medical Knowledge Group), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 1,246,000    
Ending balance [2],[3],[33]         $ 1,246,000
Investment, Identifier [Axis]: Catalis Intermediate, Inc. (fka GovBrands Intermediate, Inc.), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[18],[21],[35] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[18],[21],[35] $ 2,168,000   $ 2,168,000    
Investment, Identifier [Axis]: Catalis Intermediate, Inc. (fka GovBrands Intermediate, Inc.), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[18] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[18] $ 9,868,000   $ 9,868,000    
Investment, Identifier [Axis]: Catalis Intermediate, Inc. (fka GovBrands Intermediate, Inc.), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[22] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[22] $ 666,000   $ 666,000    
Investment, Identifier [Axis]: Centrify Corporation, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   6.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 65,401,000    
Ending balance $ 65,399,000 [17],[18]   $ 65,399,000 [17],[18]   $ 65,401,000 [2],[3],[20]
Investment, Identifier [Axis]: Centrify Corporation, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   6.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 6,732,000    
Ending balance $ (51,000) [17],[21],[34]   (51,000) [17],[21],[34]   $ 6,732,000 [2],[3],[20]
Investment, Identifier [Axis]: Chapford SMA Partnership, L.P.          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)         (49,000)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 6,175,000 0 0
Gross Additions [10]         6,224,000
Gross Reductions [12]         0
Net change in unrealized gain (loss)         (49,000)
Ending balance         6,175,000
Interest income         0
Dividend income         0
Other income         $ 0
Investment, Identifier [Axis]: Circana Group, L.P. (fka The NPD Group, L.P.), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[22] 6.25%   6.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22] $ 23,636,000   $ 23,636,000    
Investment, Identifier [Axis]: Circana Group, L.P. (fka The NPD Group, L.P.), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[22] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[22] $ 102,000   $ 102,000    
Investment, Identifier [Axis]: CivicPlus, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [31],[44]   6.75% [31],[44]   6.75% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 34,606,000    
Ending balance $ 35,133,000 [17],[44]   $ 35,133,000 [17],[44]   $ 34,606,000 [2],[3],[20]
Investment, Identifier [Axis]: CivicPlus, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[21],[54]   6.00% [17],[21],[54]   6.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (7,000)    
Ending balance $ 486,000 [17],[21],[54]   $ 486,000 [17],[21],[54]   $ (7,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Conair Holdings LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[44] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[44] $ 176,250,000   $ 176,250,000    
Investment, Identifier [Axis]: Conair Holdings, LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         7.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 170,626,000    
Ending balance [2],[3],[20]         $ 170,626,000
Investment, Identifier [Axis]: Confluent Medical Technologies, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18]   6.50% [17],[18]   6.50% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 948,000    
Ending balance $ 983,000 [17],[18]   $ 983,000 [17],[18]   $ 948,000 [2],[3],[42]
Investment, Identifier [Axis]: Cornerstone OnDemand, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18]   6.50% [17],[18]   6.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 111,200,000    
Ending balance $ 108,883,000 [17],[18]   $ 108,883,000 [17],[18]   $ 111,200,000 [2],[3],[33]
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[34],[35] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[34],[35] $ (1,000)   $ (1,000)    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[22] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22] $ 766,000   $ 766,000    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[34] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[34] $ (1,000)   $ (1,000)    
Investment, Identifier [Axis]: Covetrus Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 9.25% [17],[18]   9.25% [17],[18]   9.25% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 4,898,000    
Ending balance $ 4,838,000 [17],[18]   $ 4,838,000 [17],[18]   $ 4,898,000 [2],[3],[42]
Investment, Identifier [Axis]: Delta TopCo, Inc. (dba Infoblox, Inc.), Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.25% [17],[39]   7.25% [17],[39]   7.25% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 13,950,000    
Ending balance $ 14,550,000 [17],[39]   14,550,000 [17],[39]   $ 13,950,000 [2],[3],[42]
Investment, Identifier [Axis]: Denali BuyerCo, LLC (dba Summit Companies), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20],[23],[40]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23],[40]     $ 8,147,000    
Ending balance [2],[3],[20],[23],[40]         $ 8,147,000
Investment, Identifier [Axis]: Denali BuyerCo, LLC (dba Summit Companies), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[44]   5.75% [17],[44]   5.75% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 42,905,000    
Ending balance $ 52,753,000 [17],[44]   $ 52,753,000 [17],[44]   $ 42,905,000 [2],[3],[20]
Investment, Identifier [Axis]: Denali BuyerCo, LLC (dba Summit Companies), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (30,000)    
Ending balance $ (15,000) [17],[21],[34]   (15,000) [17],[21],[34]   $ (30,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Denali Holding, LP (dba Summit Companies), Class A Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     4,344,000    
Ending balance $ 4,649,000 [17],[30],[32]   4,649,000 [17],[30],[32]   $ 4,344,000 [3],[27],[28]
Investment, Identifier [Axis]: Diagnostic Service Holdings, Inc. (dba Rayus Radiology), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33]         5.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 988,000    
Ending balance [2],[3],[33]         $ 988,000
Investment, Identifier [Axis]: Diagnostic Services Holdings, Inc. (dba Rayus Radiology), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[22] 5.50%   5.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22] $ 989,000   $ 989,000    
Investment, Identifier [Axis]: Diamondback Acquisition, Inc. (dba Sphera), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[21],[34],[35]   5.50% [17],[21],[34],[35]   5.50% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ 0    
Ending balance $ (5,000) [17],[21],[34],[35]   $ (5,000) [17],[21],[34],[35]   $ 0 [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: Diamondback Acquisition, Inc. (dba Sphera), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[22]   5.50% [17],[22]   5.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 4,068,000    
Ending balance $ 4,027,000 [17],[22]   4,027,000 [17],[22]   $ 4,068,000 [2],[3],[33]
Investment, Identifier [Axis]: Dodge Construction Network Holdings, L.P., Class A-2 Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[30],[32] $ 1,533,000   $ 1,533,000    
Investment, Identifier [Axis]: Dodge Construction Network Holdings, L.P., Series A Preferred Units          
Schedule of Investments [Line Items]          
Basis spread, variable rate [31],[32] 8.25%   8.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[32] $ 45,000   $ 45,000    
Investment, Identifier [Axis]: Dodge Construction Network Holdings, LP, Class A-2 Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     1,855,000    
Ending balance [3],[27],[28]         $ 1,855,000
Investment, Identifier [Axis]: Dodge Construction Network Holdings, LP, Series A Preferred Units          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         8.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     $ 45,000    
Ending balance [3],[28],[45]         $ 45,000
Investment, Identifier [Axis]: Douglas Products and Packaging Company LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[18]   7.00% [17],[18]   7.00% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 18,501,000    
Ending balance $ 18,501,000 [17],[18]   $ 18,501,000 [17],[18]   $ 18,501,000 [2],[3],[36]
Investment, Identifier [Axis]: Douglas Products and Packaging Company LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[21],[38]   6.00% [17],[21],[38]   7.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (24,000)    
Ending balance $ 232,000 [17],[21],[38]   $ 232,000 [17],[21],[38]   $ (24,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: EET Buyer, Inc. (dba e-Emphasys), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18]   6.50% [17],[18]   5.25% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 4,511,000    
Ending balance $ 4,489,000 [17],[18]   $ 4,489,000 [17],[18]   $ 4,511,000 [2],[3],[4]
Investment, Identifier [Axis]: EET Buyer, Inc. (dba e-Emphasys), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[34]   6.50% [17],[21],[34]   5.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ 0 [17],[21],[34]   $ 0 [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [18],[29] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [18],[29] $ 85,785,000   $ 85,785,000    
Investment, Identifier [Axis]: Eagle Infrastructure Super Holdco LLC, Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[29],[30],[32] 24,058,000   24,058,000    
Investment, Identifier [Axis]: Eagle Infrastructure Super Llc          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     (64,000)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions [13]     109,909,000    
Gross Reductions [15]     (2,000)    
Net change in unrealized gain (loss)     (64,000)    
Ending balance 109,843,000   109,843,000   0
Interest income     2,976,000    
Dividend income     0    
Other income     2,000    
Investment, Identifier [Axis]: Elliott Alto Co-Investor Aggregator L.P., LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     3,133,000    
Ending balance $ 2,970,000 [19],[30],[31],[32]   $ 2,970,000 [19],[30],[31],[32]   $ 3,133,000 [3],[5],[27],[28]
Investment, Identifier [Axis]: Endries Acquisition, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   6.25% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 237,607,000    
Ending balance $ 236,381,000 [17],[22]   $ 236,381,000 [17],[22]   $ 237,607,000 [2],[3],[42]
Investment, Identifier [Axis]: Engage Debtco Limited, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.90% [17],[18],[19]   5.90% [17],[18],[19]   5.75% [2],[3],[5],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[42]     $ 978,000    
Ending balance $ 983,000 [17],[18],[19]   $ 983,000 [17],[18],[19]   $ 978,000 [2],[3],[5],[42]
Investment, Identifier [Axis]: Entertainment Benefits Group, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.75% [17],[22]   4.75% [17],[22]   4.75% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 862,000    
Ending balance $ 858,000 [17],[22]   $ 858,000 [17],[22]   $ 862,000 [2],[3],[36]
Investment, Identifier [Axis]: Entertainment Benefits Group, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.75% [17],[21],[22]   4.75% [17],[21],[22]   4.75% [2],[3],[23],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[36]     $ 89,000    
Ending balance $ 22,000 [17],[21],[22]   22,000 [17],[21],[22]   $ 89,000 [2],[3],[23],[36]
Investment, Identifier [Axis]: Evology, LLC, Class B Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     2,771,000    
Ending balance $ 2,974,000 [17],[30],[32]   $ 2,974,000 [17],[30],[32]   $ 2,771,000 [3],[27],[28]
Investment, Identifier [Axis]: Evolution BuyerCo, Inc. (dba SIAA), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18]   6.25% [17],[18]   6.25% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 139,589,000    
Ending balance $ 139,588,000 [17],[18]   $ 139,588,000 [17],[18]   $ 139,589,000 [2],[3],[42]
Investment, Identifier [Axis]: Evolution BuyerCo, Inc. (dba SIAA), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[21],[34]   6.25% [17],[21],[34]   6.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (161,000)    
Ending balance $ (107,000) [17],[21],[34]   (107,000) [17],[21],[34]   $ (161,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Evolution Parent, LP (dba SIAA), LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     4,284,000    
Ending balance 4,793,000 [17],[30],[32]   4,793,000 [17],[30],[32]   $ 4,284,000 [3],[27],[28]
Investment, Identifier [Axis]: Ex Vivo Parent Inc. (dba OB Hospitalist), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         9.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     56,509,000    
Ending balance $ 60,462,000 [17],[44]   60,462,000 [17],[44]   $ 56,509,000 [2],[3],[20]
Investment, Identifier [Axis]: FR Arsenal Holdings II Corp. (dba Applied-Cleveland Holdings, Inc.), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[33],[61]         9.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[33],[61]     $ 103,104,000    
Ending balance [2],[33],[61]         $ 103,104,000
Investment, Identifier [Axis]: Feradyne Outdoors, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18]   6.25% [17],[18]   6.25% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 84,726,000    
Ending balance $ 69,846,000 [17],[18]   69,846,000 [17],[18]   $ 84,726,000 [2],[3],[36]
Investment, Identifier [Axis]: Fifth Season Investments LLC (fka Chapford SMA Partnership, L.P.)          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     0   0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     89,680,000 0 0
Gross Additions     21,554,000 [13]   89,680,000 [14]
Gross Reductions     0 [15]   0 [16]
Net change in unrealized gain (loss)     0   0
Ending balance 111,234,000   111,234,000   89,680,000
Interest income     0   0
Dividend income     1,360,000   201,000
Other income     0   0
Investment, Identifier [Axis]: Fifth Season Investments LLC, Class A Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[3],[27],[28],[62]     89,680,000    
Ending balance $ 111,234,000 [17],[29],[32]   $ 111,234,000 [17],[29],[32]   $ 89,680,000 [1],[3],[27],[28],[62]
Investment, Identifier [Axis]: Forescout Technologies, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 9.00% [17],[21],[34],[35]   9.00% [17],[21],[34],[35]   8.00% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ 0    
Ending balance $ 0 [17],[21],[34],[35]   0 [17],[21],[34],[35]   $ 0 [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: Forescout Technologies, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         9.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     103,490,000    
Ending balance $ 109,178,000 [17],[44]   $ 109,178,000 [17],[44]   $ 103,490,000 [2],[3],[20]
Investment, Identifier [Axis]: Forescout Technologies, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.50% [17],[21],[34]   8.50% [17],[21],[34]   8.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ 0 [17],[21],[34]   0 [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40]         5.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40]     $ 0    
Ending balance [2],[3],[23],[40]         $ 0
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18]   5.50% [17],[18]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 4,489,000    
Ending balance $ 4,502,000 [17],[18]   $ 4,502,000 [17],[18]   $ 4,489,000 [2],[3],[20]
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18],[21]   5.50% [17],[18],[21]   5.50% [2],[3],[4],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4],[23]     $ 49,000    
Ending balance $ 51,000 [17],[18],[21]   $ 51,000 [17],[18],[21]   $ 49,000 [2],[3],[4],[23]
Investment, Identifier [Axis]: Foundation Consumer Brands, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18]   6.25% [17],[18]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 3,447,000    
Ending balance $ 3,340,000 [17],[18]   3,340,000 [17],[18]   $ 3,447,000 [2],[3],[20]
Investment, Identifier [Axis]: Fullsteam Operations, LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20],[23],[40]         7.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23],[40]     $ 5,994,000    
Ending balance [2],[3],[20],[23],[40]         $ 5,994,000
Investment, Identifier [Axis]: Fullsteam Operations, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[18] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[18] $ 10,567,000   $ 10,567,000    
Investment, Identifier [Axis]: GI Apple Midco LLC (dba Atlas Technical Consultants), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [21],[31],[34],[35] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [21],[31],[34],[35] $ (1,000)   $ (1,000)    
Investment, Identifier [Axis]: GI Apple Midco LLC (dba Atlas Technical Consultants), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[22] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22] $ 715,000   $ 715,000    
Investment, Identifier [Axis]: GI Apple Midco LLC (dba Atlas Technical Consultants), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [21],[22],[31] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [21],[22],[31] $ 29,000   $ 29,000    
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC (dba Rectangle Health), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   6.00% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 4,471,000    
Ending balance $ 4,482,000 [17],[18]   $ 4,482,000 [17],[18]   $ 4,471,000 [2],[3],[42]
Investment, Identifier [Axis]: GI Ranger Intermediate, LLC (dba Rectangle Health), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18],[21]   5.75% [17],[18],[21]   6.00% [2],[3],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[42]     $ 28,000    
Ending balance $ 141,000 [17],[18],[21]   141,000 [17],[18],[21]   $ 28,000 [2],[3],[23],[42]
Investment, Identifier [Axis]: Gainsight, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         6.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     20,902,000    
Ending balance $ 22,214,000 [17],[44]   $ 22,214,000 [17],[44]   $ 20,902,000 [2],[3],[20]
Investment, Identifier [Axis]: Gainsight, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[21],[22]   6.75% [17],[21],[22]   6.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (50,000)    
Ending balance $ 2,364,000 [17],[21],[22]   $ 2,364,000 [17],[21],[22]   $ (50,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Galls, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [18],[31]   6.75% [18],[31]   6.75% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 110,331,000    
Ending balance $ 111,449,000 [17],[18]   $ 111,449,000 [17],[18]   $ 110,331,000 [2],[3],[20]
Investment, Identifier [Axis]: Galls, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[18],[21]   6.75% [17],[18],[21]   6.75% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 14,583,000    
Ending balance $ 14,389,000 [17],[18],[21]   $ 14,389,000 [17],[18],[21]   $ 14,583,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Gaylord Chemical Company, L.L.C., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18]   6.00% [17],[18]   6.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 151,106,000    
Ending balance $ 137,136,000 [17],[18]   $ 137,136,000 [17],[18]   $ 151,106,000 [2],[3],[20]
Investment, Identifier [Axis]: Gaylord Chemical Company, L.L.C., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[21],[34]   6.00% [17],[21],[34]   6.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ 0 [17],[21],[34]   $ 0 [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: Genesis Acquisition Co. (dba Procare Software), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[18]   5.00% [17],[18]   3.75% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 17,583,000    
Ending balance $ 17,804,000 [17],[18]   $ 17,804,000 [17],[18]   $ 17,583,000 [2],[3],[4]
Investment, Identifier [Axis]: Genesis Acquisition Co. (dba Procare Software), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[18]   5.00% [17],[18]   3.75% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 2,584,000    
Ending balance $ 2,630,000 [17],[18]   $ 2,630,000 [17],[18]   $ 2,584,000 [2],[3],[4]
Investment, Identifier [Axis]: Gerson Lehrman Group, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[18]   5.25% [17],[18]   5.25% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 121,623,000    
Ending balance $ 120,990,000 [17],[18]   $ 120,990,000 [17],[18]   $ 121,623,000 [2],[3],[33]
Investment, Identifier [Axis]: Gerson Lehrman Group, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[21],[22]   5.25% [17],[21],[22]   5.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ 10,782,000 [17],[21],[22]   $ 10,782,000 [17],[21],[22]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: Global Music Rights, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 7,425,000    
Ending balance $ 7,388,000 [17],[18]   $ 7,388,000 [17],[18]   $ 7,425,000 [2],[3],[20]
Investment, Identifier [Axis]: Global Music Rights, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   5.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ 0 [17],[21],[34]   $ 0 [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: Gloves Buyer, Inc. (dba Protective Industrial Products), Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.25% [17],[22]   8.25% [17],[22]   8.25% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 28,811,000    
Ending balance $ 28,811,000 [17],[22]   28,811,000 [17],[22]   $ 28,811,000 [2],[3],[33]
Investment, Identifier [Axis]: Gloves Holdings, LP (dba Protective Industrial Products), LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     3,848,000    
Ending balance 3,851,000 [30],[31],[32]   3,851,000 [30],[31],[32]   3,848,000 [3],[27],[28]
Investment, Identifier [Axis]: GoHealth, Inc., Common stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[56]     712,000    
Ending balance $ 1,343,000 [17],[30],[57]   1,343,000 [17],[30],[57]   $ 712,000 [3],[27],[56]
Investment, Identifier [Axis]: GovBrands Intermediate, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20],[23],[40]         5.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23],[40]     2,237,000    
Ending balance [2],[3],[20],[23],[40]         $ 2,237,000
Investment, Identifier [Axis]: GovBrands Intermediate, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         5.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     10,076,000    
Ending balance [2],[3],[20]         $ 10,076,000
Investment, Identifier [Axis]: GovBrands Intermediate, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20],[23]         5.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     678,000    
Ending balance [2],[3],[20],[23]         $ 678,000
Investment, Identifier [Axis]: Granicus, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33],[40]         6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33],[40]     $ 2,467,000    
Ending balance [2],[3],[33],[40]         $ 2,467,000
Investment, Identifier [Axis]: Granicus, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18]   5.50% [17],[18]   5.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 13,059,000    
Ending balance $ 15,612,000 [17],[18]   $ 15,612,000 [17],[18]   $ 13,059,000 [2],[3],[33]
Investment, Identifier [Axis]: Granicus, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18],[21]   6.50% [17],[18],[21]   6.50% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 369,000    
Ending balance $ 347,000 [17],[18],[21]   347,000 [17],[18],[21]   $ 369,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: GrowthCurve Capital Sunrise Co-Invest LP (dba Brightway), LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     632,000    
Ending balance $ 612,000 [17],[30],[32]   $ 612,000 [17],[30],[32]   $ 632,000 [3],[27],[28]
Investment, Identifier [Axis]: Guidehouse Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   6.25% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 4,557,000    
Ending balance $ 4,557,000 [17],[22]   $ 4,557,000 [17],[22]   $ 4,557,000 [2],[3],[33]
Investment, Identifier [Axis]: H&F Opportunities LUX III S.À R.L (dba Checkmarx), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [17],[19],[22]   7.50% [17],[19],[22]   7.50% [2],[3],[5],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[33]     $ 51,567,000    
Ending balance $ 51,567,000 [17],[19],[22]   $ 51,567,000 [17],[19],[22]   $ 51,567,000 [2],[3],[5],[33]
Investment, Identifier [Axis]: H&F Opportunities LUX III S.À R.L (dba Checkmarx), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [17],[19],[21],[34]   7.50% [17],[19],[21],[34]   7.50% [2],[3],[5],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[23],[43]     $ 0    
Ending balance $ 0 [17],[19],[21],[34]   0 [17],[19],[21],[34]   $ 0 [2],[3],[5],[23],[43]
Investment, Identifier [Axis]: H-Food Holdings, LLC, LLC interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     9,337,000    
Ending balance $ 8,008,000 [17],[30],[32]   $ 8,008,000 [17],[30],[32]   $ 9,337,000 [3],[27],[28]
Investment, Identifier [Axis]: H-Food Holdings, LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[44]   7.00% [17],[44]   7.00% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 105,053,000    
Ending balance $ 95,613,000 [17],[44]   95,613,000 [17],[44]   $ 105,053,000 [2],[3],[33]
Investment, Identifier [Axis]: HGH Purchaser, Inc. (dba Horizon Services), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[36]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[36]     $ 38,284,000    
Ending balance [2],[3],[23],[36]         $ 38,284,000
Investment, Identifier [Axis]: HGH Purchaser, Inc. (dba Horizon Services), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18]   6.50% [17],[18]   6.50% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 145,650,000    
Ending balance $ 187,715,000 [17],[18]   $ 187,715,000 [17],[18]   $ 145,650,000 [2],[3],[36]
Investment, Identifier [Axis]: HGH Purchaser, Inc. (dba Horizon Services), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18],[21]   6.50% [17],[18],[21]   6.50% [2],[3],[23],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[36]     $ 9,863,000    
Ending balance $ 16,300,000 [17],[18],[21]   $ 16,300,000 [17],[18],[21]   $ 9,863,000 [2],[3],[23],[36]
Investment, Identifier [Axis]: Helix Acquisition Holdings, Inc. (dba MW Industries), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[18] 7.00%   7.00%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[18] $ 973,000   $ 973,000    
Investment, Identifier [Axis]: Hercules Borrower, LLC (dba The Vincit Group), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18]   6.25% [17],[18]   6.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 176,447,000    
Ending balance $ 175,992,000 [17],[18]   $ 175,992,000 [17],[18]   $ 176,447,000 [2],[3],[20]
Investment, Identifier [Axis]: Hercules Borrower, LLC (dba The Vincit Group), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18],[21]   6.25% [17],[18],[21]   6.50% [2],[3],[4],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4],[23]     $ 2,179,000    
Ending balance $ 2,231,000 [17],[18],[21]   2,231,000 [17],[18],[21]   $ 2,179,000 [2],[3],[4],[23]
Investment, Identifier [Axis]: Hercules Buyer, LLC (dba The Vincit Group), Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28],[63]     2,302,000    
Ending balance 2,452,000 [17],[30],[32],[64]   2,452,000 [17],[30],[32],[64]   $ 2,302,000 [3],[27],[28],[63]
Investment, Identifier [Axis]: Hercules Buyer, LLC (dba The Vincit Group), Unsecured notes          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[45],[63]         0.48%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[45],[63]     5,160,000    
Ending balance 5,772,000 [17],[46],[64]   5,772,000 [17],[46],[64]   $ 5,160,000 [3],[45],[63]
Investment, Identifier [Axis]: Hg Genesis 8 Sumoco Limited, Unsecured facility          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[5],[53]         6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[53]     45,071,000    
Ending balance 50,034,000 [17],[19],[52]   50,034,000 [17],[19],[52]   $ 45,071,000 [2],[3],[5],[53]
Investment, Identifier [Axis]: Hg Genesis 9 SumoCo Limited, Unsecured facility          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[5],[51]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[51]     46,914,000    
Ending balance 50,295,000 [17],[19],[65]   50,295,000 [17],[19],[65]   $ 46,914,000 [2],[3],[5],[51]
Investment, Identifier [Axis]: Hg Saturn Luchaco Limited, Unsecured facility          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[5],[53]         7.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[53]     118,706,000    
Ending balance 132,432,000 [17],[19],[52]   132,432,000 [17],[19],[52]   $ 118,706,000 [2],[3],[5],[53]
Investment, Identifier [Axis]: Hissho Sushi Holdings, LLC, Class A units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     83,000    
Ending balance $ 91,000 [17],[30],[32]   $ 91,000 [17],[30],[32]   $ 83,000 [3],[27],[28]
Investment, Identifier [Axis]: Hissho Sushi Merger Sub LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18]   5.50% [17],[18]   5.75% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 899,000    
Ending balance $ 897,000 [17],[18]   $ 897,000 [17],[18]   $ 899,000 [2],[3],[42]
Investment, Identifier [Axis]: Hissho Sushi Merger Sub LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18],[21]   5.50% [17],[18],[21]   5.75% [2],[3],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[42]     $ 14,000    
Ending balance $ 5,000 [17],[18],[21]   $ 5,000 [17],[18],[21]   $ 14,000 [2],[3],[23],[42]
Investment, Identifier [Axis]: Hometown Food Company, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[54]   5.00% [17],[54]   5.00% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 14,560,000    
Ending balance $ 12,064,000 [17],[54]   $ 12,064,000 [17],[54]   $ 14,560,000 [2],[3],[33]
Investment, Identifier [Axis]: Hometown Food Company, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[21],[34]   5.00% [17],[21],[34]   5.00% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 847,000    
Ending balance $ 0 [17],[21],[34]   $ 0 [17],[21],[34]   $ 847,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: Hyland Software, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[47],[54]   6.25% [17],[47],[54]   6.25% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 14,630,000    
Ending balance $ 14,824,000 [17],[47],[54]   $ 14,824,000 [17],[47],[54]   $ 14,630,000 [2],[3],[33]
Investment, Identifier [Axis]: IG Investments Holdings, LLC (dba Insight Global), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18]   6.00% [17],[18]   6.00% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 49,758,000    
Ending balance $ 49,757,000 [17],[18]   $ 49,757,000 [17],[18]   $ 49,758,000 [2],[3],[33]
Investment, Identifier [Axis]: IG Investments Holdings, LLC (dba Insight Global), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[21],[34]   6.00% [17],[21],[34]   6.00% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 1,540,000    
Ending balance $ (30,000) [17],[21],[34]   (30,000) [17],[21],[34]   $ 1,540,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: Ideal Image Development, LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40],[43]         6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (4,000)    
Ending balance [2],[3],[23],[40],[43]         $ (4,000)
Investment, Identifier [Axis]: Ideal Image Development, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[22]   6.50% [17],[22]   6.50% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 11,474,000    
Ending balance $ 10,632,000 [17],[22]   $ 10,632,000 [17],[22]   $ 11,474,000 [2],[3],[36]
Investment, Identifier [Axis]: Ideal Image Development, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[22]   6.50% [17],[22]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (32,000)    
Ending balance $ 1,674,000 [17],[22]   $ 1,674,000 [17],[22]   $ (32,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[39]   6.75% [17],[39]   5.25% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 52,697,000    
Ending balance $ 26,549,000 [17],[39]   $ 26,549,000 [17],[39]   $ 52,697,000 [2],[3],[20]
Investment, Identifier [Axis]: Ideal Tridon Holdings, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[21],[22]   6.75% [17],[21],[22]   5.25% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 3,191,000    
Ending balance $ 655,000 [17],[21],[22]   $ 655,000 [17],[21],[22]   $ 3,191,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: Imprivata, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   6.25% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 860,000    
Ending balance $ 869,000 [17],[22]   869,000 [17],[22]   $ 860,000 [2],[3],[36]
Investment, Identifier [Axis]: Indigo Buyer, Inc. (dba Inovar Packaging Group), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40]     $ 0    
Ending balance [2],[3],[23],[40]         $ 0
Investment, Identifier [Axis]: Indigo Buyer, Inc. (dba Inovar Packaging Group), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18]   6.25% [17],[18]   5.75% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 647,000    
Ending balance $ 893,000 [17],[18]   $ 893,000 [17],[18]   $ 647,000 [2],[3],[42]
Investment, Identifier [Axis]: Indigo Buyer, Inc. (dba Inovar Packaging Group), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[18],[21]   6.25% [17],[18],[21]   5.75% [2],[3],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[42]     $ 17,000    
Ending balance $ 17,000 [17],[18],[21]   $ 17,000 [17],[18],[21]   $ 17,000 [2],[3],[23],[42]
Investment, Identifier [Axis]: Innovation Ventures HoldCo, LLC (dba 5 Hour Energy), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   6.25% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 122,500,000    
Ending balance $ 122,814,000 [17],[22]   122,814,000 [17],[22]   $ 122,500,000 [2],[3],[36]
Investment, Identifier [Axis]: Inovalon Holdings, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40],[43]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     (237,000)    
Ending balance [2],[3],[23],[40],[43]         $ (237,000)
Investment, Identifier [Axis]: Inovalon Holdings, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         6.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     178,182,000    
Ending balance [2],[3],[20]         $ 178,182,000
Investment, Identifier [Axis]: Inovalon Holdings, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         10.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     94,102,000    
Ending balance [2],[3],[20]         $ 94,102,000
Investment, Identifier [Axis]: Insight CP (Blocker) Holdings, L.P. (dba CivicPlus, LLC), LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     1,230,000    
Ending balance $ 1,230,000 [19],[30],[31],[32]   $ 1,230,000 [19],[30],[31],[32]   $ 1,230,000 [3],[5],[27],[28]
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.80% [17],[18]   5.80% [17],[18]   5.80% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 216,100,000    
Ending balance $ 215,526,000 [17],[18]   $ 215,526,000 [17],[18]   $ 216,100,000 [2],[3],[4]
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (37,000)    
Ending balance $ 0 [17],[21],[34]   $ 0 [17],[21],[34]   $ (37,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Intelerad Medical Systems Incorporated (fka 11849573 Canada Inc.), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18],[19]   6.50% [17],[18],[19]   6.50% [2],[3],[5],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[42]     $ 117,204,000    
Ending balance $ 115,733,000 [17],[18],[19]   $ 115,733,000 [17],[18],[19]   $ 117,204,000 [2],[3],[5],[42]
Investment, Identifier [Axis]: Intelerad Medical Systems Incorporated (fka 11849573 Canada Inc.), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18],[19],[21]   6.50% [17],[18],[19],[21]   6.50% [2],[3],[5],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[36]     $ 4,567,000    
Ending balance $ 3,468,000 [17],[18],[19],[21]   $ 3,468,000 [17],[18],[19],[21]   $ 4,567,000 [2],[3],[5],[36]
Investment, Identifier [Axis]: Interoperability Bidco, Inc. (dba Lyniate), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[18]   7.00% [17],[18]   7.00% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 65,957,000    
Ending balance $ 65,459,000 [17],[18]   $ 65,459,000 [17],[18]   $ 65,957,000 [2],[3],[42]
Investment, Identifier [Axis]: Interoperability Bidco, Inc. (dba Lyniate), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[18],[21]   7.00% [17],[18],[21]   7.00% [2],[3],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[42]     $ 1,499,000    
Ending balance $ 1,527,000 [17],[18],[21]   1,527,000 [17],[18],[21]   $ 1,499,000 [2],[3],[23],[42]
Investment, Identifier [Axis]: KOBHG Holdings, L.P. (dba OB Hospitalist), Class A Interests          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     6,196,000    
Ending balance 6,196,000 [17],[30],[32]   6,196,000 [17],[30],[32]   6,196,000 [3],[27],[28]
Investment, Identifier [Axis]: KPCI Holdings, L.P., Class A Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     34,497,000    
Ending balance $ 35,112,000 [17],[30],[32]   $ 35,112,000 [17],[30],[32]   $ 34,497,000 [3],[27],[28]
Investment, Identifier [Axis]: KPSKY Acquisition, Inc. (dba BluSky), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18]   5.50% [17],[18]   5.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 4,817,000    
Ending balance $ 4,841,000 [17],[18]   4,841,000 [17],[18]   $ 4,817,000 [2],[3],[33]
Investment, Identifier [Axis]: KUSRP Intermediate, Inc. (dba U.S. Retirement and Benefits Partners), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[4]         9.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     34,482,000    
Ending balance $ 32,984,000 [17],[22]   $ 32,984,000 [17],[22]   $ 34,482,000 [2],[3],[4]
Investment, Identifier [Axis]: Kaseya Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[21],[22],[35]   6.25% [17],[21],[22],[35]   5.75% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ 0    
Ending balance $ 69,000 [17],[21],[22],[35]   $ 69,000 [17],[21],[22],[35]   $ 0 [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: Kaseya Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   5.75% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 18,544,000    
Ending balance $ 18,685,000 [17],[22]   $ 18,685,000 [17],[22]   $ 18,544,000 [2],[3],[42]
Investment, Identifier [Axis]: Kaseya Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[21],[22]   6.25% [17],[21],[22]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (11,000)    
Ending balance $ 281,000 [17],[21],[22]   281,000 [17],[21],[22]   $ (11,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc. (dba Kaseya Inc.), Perpetual Preferred Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[32],[46] 15,688,000   15,688,000    
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc. (dba Kaseya), Perpetual Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         11.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     13,825,000    
Ending balance [3],[28],[45]         $ 13,825,000
Investment, Identifier [Axis]: LSI Financing 1 DAC          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     (5,000)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     6,175,000    
Gross Additions [9]     15,045,000    
Gross Reductions [11]     (1,589,000)    
Net change in unrealized gain (loss)     (5,000)    
Ending balance 19,626,000   19,626,000   6,175,000
Interest income     0    
Dividend income     177,000    
Other income     0    
Investment, Identifier [Axis]: LSI Financing 1 DAC, Preferred equity          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[26],[27],[28]     6,175,000    
Ending balance $ 19,626,000 [17],[19],[32],[66]   19,626,000 [17],[19],[32],[66]   $ 6,175,000 [3],[5],[26],[27],[28]
Investment, Identifier [Axis]: Lazer Spot Holdings, Inc. (f/k/a Lazer Spot GB Holdings, Inc.), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[4]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     142,598,000    
Ending balance [2],[3],[4]         $ 142,598,000
Investment, Identifier [Axis]: Lazer Spot Holdings, Inc. (f/k/a Lazer Spot GB Holdings, Inc.), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[43]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance [2],[3],[23],[43]         $ 0
Investment, Identifier [Axis]: Learning Care Group (US) No. 2 Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [17],[44],[47]   7.50% [17],[44],[47]   7.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 25,822,000    
Ending balance $ 26,597,000 [17],[44],[47]   $ 26,597,000 [17],[44],[47]   $ 25,822,000 [2],[3],[20]
Investment, Identifier [Axis]: Lightbeam Bidco, Inc. (dba Lazer Spot), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [21],[31],[34],[35] 6.25%   6.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [21],[31],[34],[35] $ 0   $ 0    
Investment, Identifier [Axis]: Lightbeam Bidco, Inc. (dba Lazer Spot), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[18] 6.25%   6.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[18] $ 3,887,000   $ 3,887,000    
Investment, Identifier [Axis]: Lightbeam Bidco, Inc. (dba Lazer Spot), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[34] 6.25%   6.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[34] $ (5,000)   $ (5,000)    
Investment, Identifier [Axis]: Lignetics Investment Corp., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40],[43]         6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (78,000)    
Ending balance [2],[3],[23],[40],[43]         $ (78,000)
Investment, Identifier [Axis]: Lignetics Investment Corp., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18]   6.00% [17],[18]   6.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 30,438,000    
Ending balance $ 34,379,000 [17],[18]   $ 34,379,000 [17],[18]   $ 30,438,000 [2],[3],[20]
Investment, Identifier [Axis]: Lignetics Investment Corp., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[21],[39]   6.00% [17],[21],[39]   6.00% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 2,729,000    
Ending balance $ 4,490,000 [17],[21],[39]   $ 4,490,000 [17],[21],[39]   $ 2,729,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: LineStar Integrity Services LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.25% [31],[39]   7.25% [31],[39]   7.25% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 53,768,000    
Ending balance $ 49,814,000 [31],[39]   $ 49,814,000 [31],[39]   $ 53,768,000 [2],[3],[4]
Investment, Identifier [Axis]: Litera Bidco LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[22]   5.25% [17],[22]   5.75% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 148,354,000    
Ending balance $ 147,756,000 [17],[22]   $ 147,756,000 [17],[22]   $ 148,354,000 [2],[3],[36]
Investment, Identifier [Axis]: Litera Bidco LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[21],[34]   5.25% [17],[21],[34]   5.75% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 1,549,000    
Ending balance $ (14,000) [17],[21],[34]   $ (14,000) [17],[21],[34]   $ 1,549,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Lytx, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[22]   6.75% [17],[22]   6.75% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 70,472,000    
Ending balance $ 70,651,000 [17],[22]   $ 70,651,000 [17],[22]   $ 70,472,000 [2],[3],[36]
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC (dba OnPoint Group), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18]   6.00% [17],[18]   6.00% [2],[3],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[41]     $ 179,957,000    
Ending balance $ 179,950,000 [17],[18]   $ 179,950,000 [17],[18]   $ 179,957,000 [2],[3],[41]
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC (dba OnPoint Group), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18],[21]   6.00% [17],[18],[21]   6.00% [2],[3],[23],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[41]     $ 2,020,000    
Ending balance $ 3,962,000 [17],[18],[21]   $ 3,962,000 [17],[18],[21]   $ 2,020,000 [2],[3],[23],[41]
Investment, Identifier [Axis]: MINDBODY, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[54]   7.00% [17],[54]   7.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 67,637,000    
Ending balance $ 67,298,000 [17],[54]   $ 67,298,000 [17],[54]   $ 67,637,000 [2],[3],[20]
Investment, Identifier [Axis]: MINDBODY, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[21],[34]   7.00% [17],[21],[34]   7.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ (30,000) [17],[21],[34]   (30,000) [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: Maia Aggregator, LP, Class A-2 Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     179,000    
Ending balance 179,000 [17],[30],[32]   179,000 [17],[30],[32]   $ 179,000 [3],[27],[28]
Investment, Identifier [Axis]: Mario Midco Holdings, Inc. (dba Len the Plumber), Unsecured facility          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[36]         10.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     4,020,000    
Ending balance $ 4,380,000 [17],[22]   $ 4,380,000 [17],[22]   $ 4,020,000 [2],[3],[36]
Investment, Identifier [Axis]: Mario Purchaser, LLC (dba Len the Plumber), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[22],[35]   5.75% [17],[21],[22],[35]   5.75% [2],[3],[23],[36],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[36],[40]     $ 2,000,000    
Ending balance $ 3,143,000 [17],[21],[22],[35]   $ 3,143,000 [17],[21],[22],[35]   $ 2,000,000 [2],[3],[23],[36],[40]
Investment, Identifier [Axis]: Mario Purchaser, LLC (dba Len the Plumber), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[22]   5.75% [17],[22]   5.75% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 12,911,000    
Ending balance $ 12,911,000 [17],[22]   $ 12,911,000 [17],[22]   $ 12,911,000 [2],[3],[36]
Investment, Identifier [Axis]: Mario Purchaser, LLC (dba Len the Plumber), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (14,000)    
Ending balance $ (7,000) [17],[21],[34]   $ (7,000) [17],[21],[34]   $ (14,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Medline Borrower, LP, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 3.25% [17],[21],[34]   3.25% [17],[21],[34]   2.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (485,000)    
Ending balance $ (198,000) [17],[21],[34]   $ (198,000) [17],[21],[34]   $ (485,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: MessageBird BidCo B.V., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[19],[54]   6.75% [17],[19],[54]   6.75% [2],[3],[5],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[33]     $ 75,268,000    
Ending balance $ 44,468,000 [17],[19],[54]   44,468,000 [17],[19],[54]   $ 75,268,000 [2],[3],[5],[33]
Investment, Identifier [Axis]: MessageBird Holding B.V., Extended Series C Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     89,000    
Ending balance 138,000 [19],[30],[31],[32]   138,000 [19],[30],[31],[32]   $ 89,000 [3],[5],[27],[28]
Investment, Identifier [Axis]: Metis HoldCo, Inc. (dba Mavis Tire Express Services), Series A Convertible Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     161,677,000    
Ending balance $ 173,891,000 [17],[32],[46]   $ 173,891,000 [17],[32],[46]   $ 161,677,000 [3],[28],[45]
Investment, Identifier [Axis]: Milan Laser Holdings LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[22]   5.00% [17],[22]   5.00% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 24,055,000    
Ending balance $ 23,933,000 [17],[22]   $ 23,933,000 [17],[22]   $ 24,055,000 [2],[3],[36]
Investment, Identifier [Axis]: Milan Laser Holdings LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[21],[34]   5.00% [17],[21],[34]   5.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ 0 [17],[21],[34]   0 [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: Minerva Holdco, Inc., Series A Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         10.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     6,734,000    
Ending balance $ 7,307,000 [17],[32],[46]   $ 7,307,000 [17],[32],[46]   $ 6,734,000 [3],[28],[45]
Investment, Identifier [Axis]: Ministry Brands Holdings, LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[21],[22],[35]   5.50% [17],[21],[22],[35]   5.50% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (3,000)    
Ending balance $ 26,000 [17],[21],[22],[35]   $ 26,000 [17],[21],[22],[35]   $ (3,000) [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: Ministry Brands Holdings, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[22]   5.50% [17],[22]   5.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 683,000    
Ending balance $ 683,000 [17],[22]   $ 683,000 [17],[22]   $ 683,000 [2],[3],[33]
Investment, Identifier [Axis]: Ministry Brands Holdings, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18],[21]   5.50% [17],[18],[21]   5.50% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 32,000    
Ending balance $ 24,000 [17],[18],[21]   $ 24,000 [17],[18],[21]   $ 32,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: Motus Group, LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[54]   6.50% [17],[54]   6.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 10,594,000    
Ending balance $ 10,649,000 [17],[54]   10,649,000 [17],[54]   $ 10,594,000 [2],[3],[33]
Investment, Identifier [Axis]: Muine Gall, LLC, First lien senior secured loan          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[2],[3],[4],[5]     254,956,000    
Ending balance $ 131,319,000 [17],[19],[39],[55]   $ 131,319,000 [17],[19],[39],[55]   $ 254,956,000 [1],[2],[3],[4],[5]
Investment, Identifier [Axis]: NMI Acquisitionco, Inc. (dba Network Merchants), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[22],[35]   5.75% [17],[21],[22],[35]   5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     $ 5,834,000    
Ending balance $ 5,849,000 [17],[21],[22],[35]   $ 5,849,000 [17],[21],[22],[35]   $ 5,834,000
Investment, Identifier [Axis]: NMI Acquisitionco, Inc. (dba Network Merchants), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[22]   5.75% [17],[22]   5.75% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 24,735,000    
Ending balance $ 24,730,000 [17],[22]   $ 24,730,000 [17],[22]   $ 24,735,000 [2],[3],[33]
Investment, Identifier [Axis]: NMI Acquisitionco, Inc. (dba Network Merchants), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (21,000)    
Ending balance $ (12,000) [17],[21],[34]   $ (12,000) [17],[21],[34]   $ (21,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: National Dentex Labs LLC (fka Barracuda Dental LLC), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.00% [18],[31]   8.00% [18],[31]   8.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 103,381,000    
Ending balance $ 104,431,000 [17],[18]   $ 104,431,000 [17],[18]   $ 103,381,000 [2],[3],[20]
Investment, Identifier [Axis]: National Dentex Labs LLC (fka Barracuda Dental LLC), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[18],[21]   7.00% [17],[18],[21]   7.00% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 8,961,000    
Ending balance $ 7,258,000 [17],[18],[21]   $ 7,258,000 [17],[18],[21]   $ 8,961,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Natural Partners, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18],[19]   6.00% [17],[18],[19]   6.00% [2],[3],[4],[5]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4],[5]     $ 906,000    
Ending balance $ 910,000 [17],[18],[19]   $ 910,000 [17],[18],[19]   $ 906,000 [2],[3],[4],[5]
Investment, Identifier [Axis]: Natural Partners, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[19],[21],[34]   6.00% [17],[19],[21],[34]   6.00% [2],[3],[5],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[23],[43]     $ (1,000)    
Ending balance $ (1,000) [17],[19],[21],[34]   $ (1,000) [17],[19],[21],[34]   $ (1,000) [2],[3],[5],[23],[43]
Investment, Identifier [Axis]: Nelipak Holding Company, First lien senior secured EUR revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.50% [17],[21],[67]   4.50% [17],[21],[67]   4.50% [2],[3],[23],[51]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[51]     $ 2,522,000    
Ending balance $ 1,754,000 [17],[21],[67]   $ 1,754,000 [17],[21],[67]   $ 2,522,000 [2],[3],[23],[51]
Investment, Identifier [Axis]: Nelipak Holding Company, First lien senior secured USD revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.25% [17],[21],[22]   4.25% [17],[21],[22]   4.25% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 1,017,000    
Ending balance $ 1,206,000 [17],[21],[22]   $ 1,206,000 [17],[21],[22]   $ 1,017,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Nelipak Holding Company, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.25% [17],[18]   4.25% [17],[18]   4.25% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 2,269,000    
Ending balance $ 2,274,000 [17],[18]   $ 2,274,000 [17],[18]   $ 2,269,000 [2],[3],[20]
Investment, Identifier [Axis]: Nelipak Holding Company, Second lien EUR senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.50% [17],[65]   8.50% [17],[65]   8.50% [2],[3],[50]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[50]     $ 63,340,000    
Ending balance $ 65,242,000 [17],[65]   $ 65,242,000 [17],[65]   $ 63,340,000 [2],[3],[50]
Investment, Identifier [Axis]: Nelipak Holding Company, Second lien USD senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.25% [17],[18]   8.25% [17],[18]   8.25% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 66,503,000    
Ending balance $ 67,006,000 [17],[18]   $ 67,006,000 [17],[18]   $ 66,503,000 [2],[3],[20]
Investment, Identifier [Axis]: Nellson Nutraceutical, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.75% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 25,527,000    
Ending balance $ 25,689,000 [17],[18]   25,689,000 [17],[18]   $ 25,527,000 [2],[3],[36]
Investment, Identifier [Axis]: New PLI Holdings, LLC (dba PLI), Class A Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[26],[27],[28]     97,799,000    
Ending balance $ 97,691,000 [17],[29],[30],[32]   $ 97,691,000 [17],[29],[30],[32]   $ 97,799,000 [3],[26],[27],[28]
Investment, Identifier [Axis]: Norvax, LLC (dba GoHealth), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.50% [17],[22]   7.50% [17],[22]   7.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 75,440,000    
Ending balance $ 73,390,000 [17],[22]   $ 73,390,000 [17],[22]   $ 75,440,000 [2],[3],[20]
Investment, Identifier [Axis]: Norvax, LLC (dba GoHealth), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[34]   6.50% [17],[21],[34]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (184,000)    
Ending balance $ (153,000) [17],[21],[34]   $ (153,000) [17],[21],[34]   $ (184,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Notorious Topco, LLC (dba Beauty Industry Group), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[18],[21],[35]   6.75% [17],[18],[21],[35]   6.75% [2],[3],[23],[40],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[42]     $ 9,482,000    
Ending balance $ 9,284,000 [17],[18],[21],[35]   $ 9,284,000 [17],[18],[21],[35]   $ 9,482,000 [2],[3],[23],[40],[42]
Investment, Identifier [Axis]: Notorious Topco, LLC (dba Beauty Industry Group), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[18]   6.75% [17],[18]   6.75% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 108,809,000    
Ending balance $ 106,899,000 [17],[18]   $ 106,899,000 [17],[18]   $ 108,809,000 [2],[3],[42]
Investment, Identifier [Axis]: Notorious Topco, LLC (dba Beauty Industry Group), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[18],[21]   6.75% [17],[18],[21]   6.75% [2],[3],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[42]     $ 1,548,000    
Ending balance $ 471,000 [17],[18],[21]   471,000 [17],[18],[21]   $ 1,548,000 [2],[3],[23],[42]
Investment, Identifier [Axis]: Nutraceutical International Corporation, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     169,845,000    
Ending balance [2],[3],[33]         $ 169,845,000
Investment, Identifier [Axis]: Nutraceutical International Corporation, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 12,356,000    
Ending balance [2],[3],[33]         $ 12,356,000
Investment, Identifier [Axis]: OB Hospitalist Group, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[22]   5.50% [17],[22]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 93,841,000    
Ending balance $ 92,659,000 [17],[22]   $ 92,659,000 [17],[22]   $ 93,841,000 [2],[3],[20]
Investment, Identifier [Axis]: OB Hospitalist Group, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18],[21]   5.50% [17],[18],[21]   5.50% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 5,062,000    
Ending balance $ 6,400,000 [17],[18],[21]   6,400,000 [17],[18],[21]   $ 5,062,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: ORCC Senior Loan Fund LLC (fka Sebago Lake LLC)          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss) [68]         (27,205,000)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [68]     $ 288,981,000 [1],[5],[26],[28],[69] 247,061,000 247,061,000
Gross Additions [14],[68]         118,125,000
Gross Reductions [16],[68]         (49,000,000)
Net change in unrealized gain (loss) [68]         (27,205,000)
Ending balance [1],[5],[26],[28],[68],[69]         288,981,000
Interest income [68]         0
Dividend income [68]         33,673,000
Other income [68]         $ 0
Investment, Identifier [Axis]: Ocala Bidco, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[34],[35] 5.75%   5.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[34],[35] $ (95,000)   $ (95,000)    
Investment, Identifier [Axis]: Ocala Bidco, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [31],[44] 6.25%   6.25%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[44] $ 182,030,000   $ 182,030,000    
Investment, Identifier [Axis]: Ocala Bidco, Inc., Second lien senior secured loan          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[18] $ 102,217,000   $ 102,217,000    
Investment, Identifier [Axis]: Offen, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[39]   5.00% [17],[39]   5.00% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 18,695,000    
Ending balance $ 18,668,000 [17],[39]   $ 18,668,000 [17],[39]   $ 18,695,000 [2],[3],[33]
Investment, Identifier [Axis]: Ole Smoky Distillery, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[22]   5.00% [17],[22]   5.25% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 860,000    
Ending balance $ 860,000 [17],[22]   $ 860,000 [17],[22]   $ 860,000 [2],[3],[36]
Investment, Identifier [Axis]: Ole Smoky Distillery, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.00% [17],[21],[34]   5.00% [17],[21],[34]   5.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (2,000)    
Ending balance $ (2,000) [17],[21],[34]   (2,000) [17],[21],[34]   $ (2,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: PCF Holdco, LLC (dba PCF Insurance Services), Class A Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     67,456,000    
Ending balance 67,457,000 [17],[30],[32]   67,457,000 [17],[30],[32]   $ 67,456,000 [3],[27],[28]
Investment, Identifier [Axis]: PCF Holdco, LLC (dba PCF Insurance Services), Class A Warrants          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[30],[32] 4,400,000   4,400,000    
Investment, Identifier [Axis]: PCF Holdco, LLC (dba PCF Insurance Services), Series A Preferred Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[32],[46] 6,921,000   6,921,000    
Investment, Identifier [Axis]: PCF Midco II, LLC (dba PCF Insurance Services), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[45]         9.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[45]     118,636,000    
Ending balance $ 126,508,000 [17],[46]   $ 126,508,000 [17],[46]   $ 118,636,000 [3],[45]
Investment, Identifier [Axis]: PHM Netherlands Midco B.V. (dba Loparex), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.50% [17],[44]   4.50% [17],[44]   4.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 751,000    
Ending balance $ 741,000 [17],[44]   $ 741,000 [17],[44]   $ 751,000 [2],[3],[20]
Investment, Identifier [Axis]: PHM Netherlands Midco B.V. (dba Loparex), Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.75% [17],[44]   8.75% [17],[44]   8.75% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 109,200,000    
Ending balance $ 108,640,000 [17],[44]   108,640,000 [17],[44]   $ 109,200,000 [2],[3],[20]
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40],[43]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (1,000)    
Ending balance [2],[3],[23],[40],[43]         $ (1,000)
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.75% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 807,000    
Ending balance $ 921,000 [17],[18]   $ 921,000 [17],[18]   $ 807,000 [2],[3],[42]
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   5.75% [2],[3],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[42]     $ 17,000    
Ending balance $ (1,000) [17],[21],[34]   (1,000) [17],[21],[34]   $ 17,000 [2],[3],[23],[42]
Investment, Identifier [Axis]: PS Op Holdings LLC (fka QC Supply, LLC), Class A Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [26],[27],[28]     3,950,000    
Ending balance 3,725,000 [29],[30],[32]   3,725,000 [29],[30],[32]   3,950,000 [26],[27],[28]
Investment, Identifier [Axis]: PS Operating Company LLC (fka QC Supply, LLC)          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     (384,000)   (669,000)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     20,361,000 19,495,000 19,495,000
Gross Additions     24,000 [13]   2,979,000 [14]
Gross Reductions     (168,000) [15]   (1,444,000) [16]
Net change in unrealized gain (loss)     (384,000)   (669,000)
Ending balance $ 19,833,000   19,833,000   20,361,000
Interest income     963,000   1,375,000
Dividend income     0   0
Other income     $ 3,000   $ 9,000
Investment, Identifier [Axis]: PS Operating Company LLC (fka QC Supply, LLC), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [18],[29]   6.00% [18],[29]   6.00% [2],[20],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[20],[26]     $ 12,778,000    
Ending balance $ 12,678,000 [18],[29]   $ 12,678,000 [18],[29]   $ 12,778,000 [2],[20],[26]
Investment, Identifier [Axis]: PS Operating Company LLC (fka QC Supply, LLC), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [18],[21],[29]   6.00% [18],[21],[29]   6.00% [2],[20],[23],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[20],[23],[26]     $ 3,633,000    
Ending balance $ 3,430,000 [18],[21],[29]   $ 3,430,000 [18],[21],[29]   $ 3,633,000 [2],[20],[23],[26]
Investment, Identifier [Axis]: Pacific BidCo Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[19],[21],[34],[35]   5.75% [17],[19],[21],[34],[35]   5.75% [2],[3],[5],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[23],[40],[43]     $ (34,000)    
Ending balance $ (9,000) [17],[19],[21],[34],[35]   $ (9,000) [17],[19],[21],[34],[35]   $ (34,000) [2],[3],[5],[23],[40],[43]
Investment, Identifier [Axis]: Pacific BidCo Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18],[19]   5.75% [17],[18],[19]   5.75% [2],[3],[5],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[42]     $ 30,228,000    
Ending balance $ 30,460,000 [17],[18],[19]   $ 30,460,000 [17],[18],[19]   $ 30,228,000 [2],[3],[5],[42]
Investment, Identifier [Axis]: Packaging Coordinators Midco, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[44]   7.00% [17],[44]   7.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 185,261,000    
Ending balance $ 189,182,000 [17],[44]   $ 189,182,000 [17],[44]   $ 185,261,000 [2],[3],[20]
Investment, Identifier [Axis]: Patriot Acquisition TopCo S.A.R.L (dba Corza Health, Inc.), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[18],[19]   6.75% [17],[18],[19]   6.75% [2],[3],[5],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[42]     $ 133,680,000    
Ending balance $ 133,000,000 [17],[18],[19]   $ 133,000,000 [17],[18],[19]   $ 133,680,000 [2],[3],[5],[42]
Investment, Identifier [Axis]: Patriot Acquisition TopCo S.A.R.L (dba Corza Health, Inc.), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.75% [17],[19],[21],[34]   6.75% [17],[19],[21],[34]   6.75% [2],[3],[5],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[23],[42]     $ 2,732,000    
Ending balance $ (169,000) [17],[19],[21],[34]   (169,000) [17],[19],[21],[34]   $ 2,732,000 [2],[3],[5],[23],[42]
Investment, Identifier [Axis]: Patriot Holdings SCSp (dba Corza Health, Inc.), Class A Units          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[5],[28],[45]         8.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[28],[45]     8,534,000    
Ending balance 9,219,000 [17],[19],[32],[46]   9,219,000 [17],[19],[32],[46]   $ 8,534,000 [3],[5],[28],[45]
Investment, Identifier [Axis]: Patriot Holdings SCSp (dba Corza Health, Inc.), Class B Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     1,145,000    
Ending balance $ 1,625,000 [17],[19],[30],[32]   $ 1,625,000 [17],[19],[30],[32]   $ 1,145,000 [3],[5],[27],[28]
Investment, Identifier [Axis]: Peraton Corp., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.75% [17],[18],[47]   7.75% [17],[18],[47]   7.75% [2],[3],[33],[48]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33],[48]     $ 43,691,000    
Ending balance $ 44,614,000 [17],[18],[47]   $ 44,614,000 [17],[18],[47]   $ 43,691,000 [2],[3],[33],[48]
Investment, Identifier [Axis]: PerkinElmer U.S. LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[18] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[18] $ 897,000   $ 897,000    
Investment, Identifier [Axis]: Peter C. Foy & Associates Insurance Services, LLC (dba PCF Insurance Services), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[22]   6.00% [17],[22]   6.00% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 134,570,000    
Ending balance $ 134,225,000 [17],[22]   $ 134,225,000 [17],[22]   $ 134,570,000 [2],[3],[4]
Investment, Identifier [Axis]: Peter C. Foy & Associates Insurance Services, LLC (dba PCF Insurance Services), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[21],[34]   6.00% [17],[21],[34]   6.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (15,000)    
Ending balance $ 0 [17],[21],[34]   $ 0 [17],[21],[34]   $ (15,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Phoenix Newco, Inc. (dba Parexel), Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[22]   6.50% [17],[22]   6.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 186,200,000    
Ending balance $ 188,575,000 [17],[22]   188,575,000 [17],[22]   $ 186,200,000 [2],[3],[33]
Investment, Identifier [Axis]: Picard Holdco, LLC, Series A Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[28],[42]         12.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[28],[42]     24,925,000    
Ending balance $ 25,167,000 [18],[31],[32]   $ 25,167,000 [18],[31],[32]   $ 24,925,000 [2],[3],[28],[42]
Investment, Identifier [Axis]: Ping Identity Holding Corp., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[22]   7.00% [17],[22]   7.00% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 895,000    
Ending balance $ 900,000 [17],[22]   $ 900,000 [17],[22]   $ 895,000 [2],[3],[36]
Investment, Identifier [Axis]: Ping Identity Holding Corp., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[21],[34]   7.00% [17],[21],[34]   7.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (1,000)    
Ending balance $ (1,000) [17],[21],[34]   $ (1,000) [17],[21],[34]   $ (1,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Plasma Buyer LLC (dba PathGroup), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34],[35]   5.75% [17],[21],[34],[35]   5.75% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (1,000)    
Ending balance $ (3,000) [17],[21],[34],[35]   $ (3,000) [17],[21],[34],[35]   $ (1,000) [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: Plasma Buyer LLC (dba PathGroup), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.75% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 667,000    
Ending balance $ 659,000 [17],[18]   $ 659,000 [17],[18]   $ 667,000 [2],[3],[36]
Investment, Identifier [Axis]: Plasma Buyer LLC (dba PathGroup), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (1,000)    
Ending balance $ (2,000) [17],[21],[34]   $ (2,000) [17],[21],[34]   $ (1,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Pluralsight, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.00% [17],[18]   8.00% [17],[18]   8.00% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 97,958,000    
Ending balance $ 97,958,000 [17],[18]   $ 97,958,000 [17],[18]   $ 97,958,000 [2],[3],[20]
Investment, Identifier [Axis]: Pluralsight, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.00% [17],[18],[21]   8.00% [17],[18],[21]   8.00% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 3,024,000    
Ending balance $ 3,024,000 [17],[18],[21]   $ 3,024,000 [17],[18],[21]   $ 3,024,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: Pregis Topco LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.02% [17],[54]   7.02% [17],[54]   7.02% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 158,193,000    
Ending balance $ 159,329,000 [17],[54]   $ 159,329,000 [17],[54]   $ 158,193,000 [2],[3],[33]
Investment, Identifier [Axis]: Premier Imaging, LLC (dba LucidHealth), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[22]   6.00% [17],[22]   5.75% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 42,460,000    
Ending balance $ 42,395,000 [17],[22]   42,395,000 [17],[22]   $ 42,460,000 [2],[3],[33]
Investment, Identifier [Axis]: Project Alpine Co-Invest Fund, LP, LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [19],[30],[31],[32] 10,974,000   10,974,000    
Investment, Identifier [Axis]: Project Alpine Co-Invest Fund,LP, LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     10,000,000    
Ending balance [3],[5],[27],[28]         10,000,000
Investment, Identifier [Axis]: Project Hotel California Co-Invest Fund, L.P., LP Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     2,685,000    
Ending balance $ 2,686,000 [19],[30],[31],[32]   $ 2,686,000 [19],[30],[31],[32]   $ 2,685,000 [3],[5],[27],[28]
Investment, Identifier [Axis]: Project Power Buyer, LLC (dba PEC-Veriforce), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[18]   7.00% [17],[18]   6.00% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 44,630,000    
Ending balance $ 43,959,000 [17],[18]   $ 43,959,000 [17],[18]   $ 44,630,000 [2],[3],[33]
Investment, Identifier [Axis]: Project Power Buyer, LLC (dba PEC-Veriforce), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [17],[21],[34]   7.00% [17],[21],[34]   6.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ (32,000) [17],[21],[34]   $ (32,000) [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: Proofpoint, Inc., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   6.25% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 18,767,000    
Ending balance $ 18,963,000 [17],[22]   $ 18,963,000 [17],[22]   $ 18,767,000 [2],[3],[20]
Investment, Identifier [Axis]: QAD, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.38% [17],[22]   5.38% [17],[22]   6.00% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 25,713,000    
Ending balance $ 25,714,000 [17],[22]   $ 25,714,000 [17],[22]   $ 25,713,000 [2],[3],[33]
Investment, Identifier [Axis]: QAD, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.38% [17],[21],[34]   5.38% [17],[21],[34]   6.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (86,000)    
Ending balance $ (69,000) [17],[21],[34]   $ (69,000) [17],[21],[34]   $ (86,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Quva Pharma, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [22],[31]   5.50% [22],[31]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 38,710,000    
Ending balance $ 38,711,000 [22],[31]   $ 38,711,000 [22],[31]   $ 38,710,000 [2],[3],[20]
Investment, Identifier [Axis]: Quva Pharma, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[21],[22]   5.50% [17],[21],[22]   5.50% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 1,840,000    
Ending balance $ 1,780,000 [17],[21],[22]   $ 1,780,000 [17],[21],[22]   $ 1,840,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: REALPAGE, INC., Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[22],[47]   6.50% [17],[22],[47]   6.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 33,033,000    
Ending balance $ 33,319,000 [17],[22],[47]   $ 33,319,000 [17],[22],[47]   $ 33,033,000 [2],[3],[33]
Investment, Identifier [Axis]: Recipe Acquisition Corp. (dba Roland Corporation), Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 9.00% [18]   9.00% [18]   9.00% [2],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[42]     $ 31,520,000    
Ending balance $ 31,760,000 [18]   $ 31,760,000 [18]   $ 31,520,000 [2],[42]
Investment, Identifier [Axis]: Relativity ODA LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [22],[31]   6.50% [22],[31]   7.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 83,772,000    
Ending balance $ 85,834,000 [17],[22]   $ 85,834,000 [17],[22]   $ 83,772,000 [2],[3],[33]
Investment, Identifier [Axis]: Relativity ODA LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [21],[31],[34]   6.50% [21],[31],[34]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (18,000)    
Ending balance $ 0 [21],[31],[34]   0 [21],[31],[34]   $ (18,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Rhea Acquisition Holdings, LP, Series A-2 Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     119,000    
Ending balance $ 154,000 [17],[30],[32]   $ 154,000 [17],[30],[32]   $ 119,000 [3],[27],[28]
Investment, Identifier [Axis]: Rhea Parent, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.75% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 753,000    
Ending balance $ 758,000 [17],[18]   758,000 [17],[18]   $ 753,000 [2],[3],[42]
Investment, Identifier [Axis]: SWK BUYER, Inc. (dba Stonewall Kitchen), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[40],[43]         5.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (4,000)    
Ending balance [2],[3],[23],[40],[43]         $ (4,000)
Investment, Identifier [Axis]: SWK BUYER, Inc. (dba Stonewall Kitchen), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[39]   5.25% [17],[39]   5.25% [2],[3],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[41]     $ 728,000    
Ending balance $ 717,000 [17],[39]   $ 717,000 [17],[39]   $ 728,000 [2],[3],[41]
Investment, Identifier [Axis]: SWK BUYER, Inc. (dba Stonewall Kitchen), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[21],[39]   5.25% [17],[21],[39]   5.25% [2],[3],[23],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[36]     $ 22,000    
Ending balance $ 62,000 [17],[21],[39]   $ 62,000 [17],[21],[39]   $ 22,000 [2],[3],[23],[36]
Investment, Identifier [Axis]: Safety Products/JHC Acquisition Corp. (dba Justrite Safety Group), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.50% [17],[22],[47]   4.50% [17],[22],[47]   4.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 13,470,000    
Ending balance $ 12,925,000 [17],[22],[47]   $ 12,925,000 [17],[22],[47]   $ 13,470,000 [2],[3],[33]
Investment, Identifier [Axis]: SailPoint Technologies Holdings, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   6.25% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 44,727,000    
Ending balance $ 45,070,000 [17],[22]   $ 45,070,000 [17],[22]   $ 44,727,000 [2],[3],[36]
Investment, Identifier [Axis]: SailPoint Technologies Holdings, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[21],[34]   6.25% [17],[21],[34]   6.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (87,000)    
Ending balance $ (54,000) [17],[21],[34]   $ (54,000) [17],[21],[34]   $ (87,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Sara Lee Frozen Bakery, LLC (fka KSLB Holdings, LLC), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.50% [17],[18]   4.50% [17],[18]   4.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 40,693,000    
Ending balance $ 40,915,000 [17],[18]   $ 40,915,000 [17],[18]   $ 40,693,000 [2],[3],[20]
Investment, Identifier [Axis]: Sara Lee Frozen Bakery, LLC (fka KSLB Holdings, LLC), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.50% [17],[18],[21]   4.50% [17],[18],[21]   4.50% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 6,435,000    
Ending balance $ 5,828,000 [17],[18],[21]   $ 5,828,000 [17],[18],[21]   $ 6,435,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Securonix, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18]   6.50% [17],[18]   6.50% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 839,000    
Ending balance $ 818,000 [17],[18]   $ 818,000 [17],[18]   $ 839,000 [2],[3],[42]
Investment, Identifier [Axis]: Securonix, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[34]   6.50% [17],[21],[34]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (2,000)    
Ending balance $ (5,000) [17],[21],[34]   $ (5,000) [17],[21],[34]   $ (2,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Sensor Technology Topco, Inc. (dba Humanetics), First lien senior secured EUR term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [31],[65] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [31],[65] $ 12,418,000   $ 12,418,000    
Investment, Identifier [Axis]: Sensor Technology Topco, Inc. (dba Humanetics), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50%   6.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [18],[31] $ 63,230,000   $ 63,230,000    
Investment, Identifier [Axis]: Sensor Technology Topco, Inc. (dba Humanetics), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[65] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[65] $ 1,110,000   $ 1,110,000    
Investment, Identifier [Axis]: Shearer's Foods, LLC, Second lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.75% [17],[22]   7.75% [17],[22]   7.75% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 114,624,000    
Ending balance $ 86,400,000 [17],[22]   $ 86,400,000 [17],[22]   $ 114,624,000 [2],[3],[33]
Investment, Identifier [Axis]: SimpliSafe Holding Corporation, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[21],[34],[35]   6.25% [17],[21],[34],[35]   6.25% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (2,000)    
Ending balance $ 0 [17],[21],[34],[35]   $ 0 [17],[21],[34],[35]   $ (2,000) [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: SimpliSafe Holding Corporation, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   6.25% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 6,065,000    
Ending balance $ 6,065,000 [17],[22]   $ 6,065,000 [17],[22]   $ 6,065,000 [2],[3],[36]
Investment, Identifier [Axis]: Smarsh Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[35],[39]   6.50% [17],[21],[35],[39]   6.50% [2],[3],[23],[40],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[41]     $ 94,000    
Ending balance $ 94,000 [17],[21],[35],[39]   $ 94,000 [17],[21],[35],[39]   $ 94,000 [2],[3],[23],[40],[41]
Investment, Identifier [Axis]: Smarsh Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[39]   6.50% [17],[39]   6.50% [2],[3],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[41]     $ 754,000    
Ending balance $ 758,000 [17],[39]   $ 758,000 [17],[39]   $ 754,000 [2],[3],[41]
Investment, Identifier [Axis]: Smarsh Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21]   6.50% [17],[21]   6.50% [2],[3],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23]     $ 0    
Ending balance $ 0 [17],[21]   0 [17],[21]   $ 0 [2],[3],[23]
Investment, Identifier [Axis]: Sonny's Enterprises LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[42]         6.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     229,908,000    
Ending balance [2],[3],[42]         $ 229,908,000
Investment, Identifier [Axis]: Sonny's Enterprises LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[43]         6.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance [2],[3],[23],[43]         $ 0
Investment, Identifier [Axis]: Sonny's Enterprises, LLC, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[34],[35] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[34],[35] $ (15,000)   $ (15,000)    
Investment, Identifier [Axis]: Sonny's Enterprises, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [18],[31] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [18],[31] $ 225,308,000   $ 225,308,000    
Investment, Identifier [Axis]: Sonny's Enterprises, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[21],[34] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[34] $ (270,000)   $ (270,000)    
Investment, Identifier [Axis]: Space Exploration Technologies Corp., Class A Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     3,509,000    
Ending balance 3,588,000 [17],[30],[32]   3,588,000 [17],[30],[32]   3,509,000 [3],[27],[28]
Investment, Identifier [Axis]: Space Exploration Technologies Corp., Class C Common Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     705,000    
Ending balance $ 721,000 [17],[30],[32]   $ 721,000 [17],[30],[32]   $ 705,000 [3],[27],[28]
Investment, Identifier [Axis]: Spotless Brands, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[18]   6.50% [17],[18]   6.50% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 47,621,000    
Ending balance $ 47,759,000 [17],[18]   $ 47,759,000 [17],[18]   $ 47,621,000 [2],[3],[42]
Investment, Identifier [Axis]: Spotless Brands, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[34]   6.50% [17],[21],[34]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (26,000)    
Ending balance $ (13,000) [17],[21],[34]   $ (13,000) [17],[21],[34]   $ (26,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Summit Acquisition Inc. (dba K2 Insurance Services), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [21],[31],[34],[35] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [21],[31],[34],[35] $ (3,000)   $ (3,000)    
Investment, Identifier [Axis]: Summit Acquisition Inc. (dba K2 Insurance Services), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [18],[31] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [18],[31] $ 711,000   $ 711,000    
Investment, Identifier [Axis]: Summit Acquisition Inc. (dba K2 Insurance Services), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [21],[31],[34] 6.75%   6.75%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [21],[31],[34] $ (3,000)   $ (3,000)    
Investment, Identifier [Axis]: Sunshine Software Holdings, Inc. (dba Cornerstone OnDemand), Series A Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         10.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     37,469,000    
Ending balance 40,360,000 [17],[32],[46]   40,360,000 [17],[32],[46]   $ 37,469,000 [3],[28],[45]
Investment, Identifier [Axis]: Swipe Acquisition Corporation (dba PLI)          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     (78,000)   50,226,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     161,680,000 108,061,000 108,061,000
Gross Additions     147,000 [13]   4,284,000 [14]
Gross Reductions     (890,000) [15]   (891,000) [16]
Net change in unrealized gain (loss)     (78,000)   50,226,000
Ending balance $ 160,859,000   160,859,000   161,680,000
Interest income     4,288,000   6,831,000
Dividend income     2,669,000   6,673,000
Other income     $ 555,000   $ 680,000
Investment, Identifier [Axis]: Swipe Acquisition Corporation (dba PLI), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.00% [17],[18],[21],[29],[35]   8.00% [17],[18],[21],[29],[35]   8.00% [2],[3],[23],[26],[40],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[26],[40],[42]     $ 14,645,000    
Ending balance $ 14,493,000 [17],[18],[21],[29],[35]   $ 14,493,000 [17],[18],[21],[29],[35]   $ 14,645,000 [2],[3],[23],[26],[40],[42]
Investment, Identifier [Axis]: Swipe Acquisition Corporation (dba PLI), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.00% [17],[18],[29]   8.00% [17],[18],[29]   8.00% [2],[3],[26],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[26],[36]     $ 49,236,000    
Ending balance $ 48,675,000 [17],[18],[29]   $ 48,675,000 [17],[18],[29]   $ 49,236,000 [2],[3],[26],[36]
Investment, Identifier [Axis]: Swipe Acquisition Corporation (dba PLI), Letter of Credit          
Schedule of Investments [Line Items]          
Basis spread, variable rate 8.00% [17],[21],[29]   8.00% [17],[21],[29]   8.00% [2],[3],[23],[26]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[26]     $ 0    
Ending balance $ 0 [17],[21],[29]   $ 0 [17],[21],[29]   $ 0 [2],[3],[23],[26]
Investment, Identifier [Axis]: THG Acquisition, LLC (dba Hilb), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[22]   5.75% [17],[22]   5.75% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 73,810,000    
Ending balance $ 73,615,000 [17],[22]   $ 73,615,000 [17],[22]   $ 73,810,000 [2],[3],[33]
Investment, Identifier [Axis]: THG Acquisition, LLC (dba Hilb), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[22]   5.75% [17],[21],[22]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (108,000)    
Ending balance $ 1,827,000 [17],[21],[22]   $ 1,827,000 [17],[21],[22]   $ (108,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[19],[54]   6.00% [17],[19],[54]   6.00% [2],[3],[5],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[33]     $ 121,099,000    
Ending balance $ 122,023,000 [17],[19],[54]   $ 122,023,000 [17],[19],[54]   $ 121,099,000 [2],[3],[5],[33]
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[19],[21],[34]   6.00% [17],[19],[21],[34]   6.00% [2],[3],[5],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[23],[43]     $ (162,000)    
Ending balance $ (92,000) [17],[19],[21],[34]   (92,000) [17],[19],[21],[34]   $ (162,000) [2],[3],[5],[23],[43]
Investment, Identifier [Axis]: Tall Tree Foods, Inc., First lien senior secured delayed draw term loan          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [18],[21],[60] 4,015,000   4,015,000    
Investment, Identifier [Axis]: Tall Tree Foods, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[33]         7.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[33]     39,084,000    
Ending balance $ 54,867,000 [18],[60]   $ 54,867,000 [18],[60]   $ 39,084,000 [2],[33]
Investment, Identifier [Axis]: Tamarack Intermediate, L.L.C. (dba Verisk 3E), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[18]   5.25% [17],[18]   5.75% [2],[3],[41]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[41]     $ 838,000    
Ending balance $ 840,000 [17],[18]   $ 840,000 [17],[18]   $ 838,000 [2],[3],[41]
Investment, Identifier [Axis]: Tamarack Intermediate, L.L.C. (dba Verisk 3E), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[18],[21]   5.25% [17],[18],[21]   5.75% [2],[3],[23],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[36]     $ 22,000    
Ending balance $ 21,000 [17],[18],[21]   $ 21,000 [17],[18],[21]   $ 22,000 [2],[3],[23],[36]
Investment, Identifier [Axis]: Tempo Buyer Corp. (dba Global Claims Services), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[21],[34],[35]   5.50% [17],[21],[34],[35]   5.50% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (5,000)    
Ending balance $ (2,000) [17],[21],[34],[35]   $ (2,000) [17],[21],[34],[35]   $ (5,000) [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: Tempo Buyer Corp. (dba Global Claims Services), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18]   5.50% [17],[18]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 1,051,000    
Ending balance $ 1,056,000 [17],[18]   $ 1,056,000 [17],[18]   $ 1,051,000 [2],[3],[20]
Investment, Identifier [Axis]: Tempo Buyer Corp. (dba Global Claims Services), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 4.25% [17],[21],[38]   4.25% [17],[21],[38]   4.50% [2],[3],[23],[70]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[70]     $ 8,000    
Ending balance $ 56,000 [17],[21],[38]   $ 56,000 [17],[21],[38]   $ 8,000 [2],[3],[23],[70]
Investment, Identifier [Axis]: The Better Being Co., LLC (fka Nutraceutical International Corporation), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [22],[38] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22] $ 160,571,000   $ 160,571,000    
Investment, Identifier [Axis]: The Better Being Co., LLC (fka Nutraceutical International Corporation), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [17],[22] 7.50%   7.50%    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22] $ 11,768,000   $ 11,768,000    
Investment, Identifier [Axis]: The NPD Group, L.P., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[36]         6.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     23,243,000    
Ending balance [2],[3],[36]         $ 23,243,000
Investment, Identifier [Axis]: The NPD Group, L.P., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[23],[36]         5.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[36]     $ 151,000    
Ending balance [2],[3],[23],[36]         $ 151,000
Investment, Identifier [Axis]: The Shade Store, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18]   6.00% [17],[18]   6.00% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 8,753,000    
Ending balance $ 8,575,000 [17],[18]   $ 8,575,000 [17],[18]   $ 8,753,000 [2],[3],[42]
Investment, Identifier [Axis]: The Shade Store, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18],[21]   6.00% [17],[18],[21]   6.00% [2],[3],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[42]     $ 230,000    
Ending balance $ 434,000 [17],[18],[21]   $ 434,000 [17],[18],[21]   $ 230,000 [2],[3],[23],[42]
Investment, Identifier [Axis]: Thunder Purchaser, Inc. (dba Vector Solutions), First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18],[21],[35]   5.75% [17],[18],[21],[35]   5.75% [2],[3],[20],[23],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23],[40]     $ 3,779,000    
Ending balance $ 3,879,000 [17],[18],[21],[35]   $ 3,879,000 [17],[18],[21],[35]   $ 3,779,000 [2],[3],[20],[23],[40]
Investment, Identifier [Axis]: Thunder Purchaser, Inc. (dba Vector Solutions), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.75% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 62,868,000    
Ending balance $ 63,347,000 [17],[18]   $ 63,347,000 [17],[18]   $ 62,868,000 [2],[3],[20]
Investment, Identifier [Axis]: Thunder Purchaser, Inc. (dba Vector Solutions), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18],[21]   5.75% [17],[18],[21]   5.75% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 1,239,000    
Ending balance $ 3,206,000 [17],[18],[21]   3,206,000 [17],[18],[21]   $ 1,239,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Thunder Topco L.P. (dba Vector Solutions), Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     3,783,000    
Ending balance $ 3,922,000 [30],[31],[32]   $ 3,922,000 [30],[31],[32]   $ 3,783,000 [3],[27],[28]
Investment, Identifier [Axis]: Tivity Health, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[18]   6.00% [17],[18]   6.00% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 983,000    
Ending balance $ 985,000 [17],[18]   $ 985,000 [17],[18]   $ 983,000 [2],[3],[42]
Investment, Identifier [Axis]: Troon Golf, L.L.C., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.75% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 280,236,000    
Ending balance $ 237,724,000 [17],[18]   $ 237,724,000 [17],[18]   $ 280,236,000 [2],[3],[4]
Investment, Identifier [Axis]: Troon Golf, L.L.C., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   5.75% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ (108,000) [17],[21],[34]   $ (108,000) [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: USRP Holdings, Inc. (dba U.S. Retirement and Benefits Partners), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 37,922,000    
Ending balance $ 38,115,000 [17],[18]   $ 38,115,000 [17],[18]   $ 37,922,000 [2],[3],[20]
Investment, Identifier [Axis]: USRP Holdings, Inc. (dba U.S. Retirement and Benefits Partners), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[34]   5.75% [17],[21],[34]   5.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (85,000)    
Ending balance $ (42,000) [17],[21],[34]   $ (42,000) [17],[21],[34]   $ (85,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Ultimate Baked Goods Midco, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[22]   6.25% [17],[22]   6.50% [2],[3],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     $ 78,797,000    
Ending balance $ 79,813,000 [17],[22]   $ 79,813,000 [17],[22]   $ 78,797,000 [2],[3],[33]
Investment, Identifier [Axis]: Ultimate Baked Goods Midco, LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.25% [17],[21],[34]   6.25% [17],[21],[34]   6.50% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 2,312,000    
Ending balance $ (124,000) [17],[21],[34]   $ (124,000) [17],[21],[34]   $ 2,312,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: Unified Women's Healthcare, LP, First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[21],[35]   5.25% [17],[21],[35]   5.25% [2],[3],[23],[40]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40]     $ 0    
Ending balance $ 0 [17],[21],[35]   $ 0 [17],[21],[35]   $ 0 [2],[3],[23],[40]
Investment, Identifier [Axis]: Unified Women's Healthcare, LP, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[22]   5.25% [17],[22]   5.25% [2],[3],[36]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[36]     $ 878,000    
Ending balance $ 903,000 [17],[22]   $ 903,000 [17],[22]   $ 878,000 [2],[3],[36]
Investment, Identifier [Axis]: Unified Women's Healthcare, LP, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.25% [17],[21],[34]   5.25% [17],[21],[34]   5.25% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ 0    
Ending balance $ 0 [17],[21],[34]   0 [17],[21],[34]   $ 0 [2],[3],[23],[43]
Investment, Identifier [Axis]: VEPF Torreys Aggregator, LLC (dba MINDBODY, Inc.), Series A Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     22,319,000    
Ending balance $ 22,992,000 [31],[32],[46]   $ 22,992,000 [31],[32],[46]   $ 22,319,000 [3],[28],[45]
Investment, Identifier [Axis]: Valence Surface Technologies LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.75% [17],[18]   7.75% [17],[18]   7.75% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 102,459,000    
Ending balance $ 105,743,000 [17],[18]   $ 105,743,000 [17],[18]   $ 102,459,000 [2],[3],[42]
Investment, Identifier [Axis]: Valence Surface Technologies LLC, First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.75%   7.75%   7.75% [2],[3],[23],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[42]     $ 8,316,000    
Ending balance $ 8,584,000 [17],[18],[21]   $ 8,584,000 [17],[18],[21]   $ 8,316,000 [2],[3],[23],[42]
Investment, Identifier [Axis]: Velocity HoldCo III Inc. (dba VelocityEHS), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[18]   5.75% [17],[18]   5.75% [2],[3],[4]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[4]     $ 21,992,000    
Ending balance $ 21,881,000 [17],[18]   $ 21,881,000 [17],[18]   $ 21,992,000 [2],[3],[4]
Investment, Identifier [Axis]: Velocity HoldCo III Inc. (dba VelocityEHS), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.75% [17],[21],[22]   5.75% [17],[21],[22]   5.75% [2],[3],[23],[33]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[33]     $ 268,000    
Ending balance $ 893,000 [17],[21],[22]   $ 893,000 [17],[21],[22]   $ 268,000 [2],[3],[23],[33]
Investment, Identifier [Axis]: Vermont Aus Pty Ltd, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18],[19]   5.50% [17],[18],[19]   5.50% [2],[3],[5],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[5],[42]     $ 968,000    
Ending balance $ 973,000 [17],[18],[19]   973,000 [17],[18],[19]   $ 968,000 [2],[3],[5],[42]
Investment, Identifier [Axis]: WMC Bidco, Inc. (dba West Monroe), Senior Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         11.25%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     17,230,000    
Ending balance 18,925,000 [31],[32],[46]   18,925,000 [31],[32],[46]   $ 17,230,000 [3],[28],[45]
Investment, Identifier [Axis]: WP Irving Co-Invest, L.P., Partnership Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[5],[27],[28]     1,250,000    
Ending balance $ 1,304,000 [17],[19],[30],[32]   $ 1,304,000 [17],[19],[30],[32]   $ 1,250,000 [3],[5],[27],[28]
Investment, Identifier [Axis]: WU Holdco, Inc. (dba Weiman Products, LLC), First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18]   5.50% [17],[18]   5.50% [2],[3],[20]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     $ 197,793,000    
Ending balance $ 195,262,000 [17],[18]   $ 195,262,000 [17],[18]   $ 197,793,000 [2],[3],[20]
Investment, Identifier [Axis]: WU Holdco, Inc. (dba Weiman Products, LLC), First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 5.50% [17],[18],[21]   5.50% [17],[18],[21]   5.50% [2],[3],[20],[23]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[23]     $ 9,507,000    
Ending balance $ 10,515,000 [17],[18],[21]   10,515,000 [17],[18],[21]   $ 9,507,000 [2],[3],[20],[23]
Investment, Identifier [Axis]: Walker Edison Furniture Company LLC, First lien senior secured delayed draw term loan          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[21],[22],[29],[60] 568,000   568,000    
Investment, Identifier [Axis]: Walker Edison Furniture Company LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20],[61]         8.75%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20],[61]     43,963,000    
Ending balance 21,673,000 [17],[22],[29],[60]   21,673,000 [17],[22],[29],[60]   $ 43,963,000 [2],[3],[20],[61]
Investment, Identifier [Axis]: Walker Edison Furniture Company LLC, First lien senior secured revolving loan          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[22],[29],[60] 11,241,000   11,241,000    
Investment, Identifier [Axis]: Walker Edison Furniture Company, LLC          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     (1,075,000)    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     0    
Gross Additions [13]     56,042,000    
Gross Reductions [15]     0    
Net change in unrealized gain (loss)     (1,075,000)    
Ending balance 54,967,000   54,967,000   $ 0
Interest income     0    
Dividend income     0    
Other income     18,000    
Investment, Identifier [Axis]: Walker Edison Holdco LLC, Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [17],[29],[30],[32] 21,485,000   21,485,000    
Investment, Identifier [Axis]: When I Work, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[20]         7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[20]     5,096,000    
Ending balance $ 5,290,000 [17],[44]   $ 5,290,000 [17],[44]   $ 5,096,000 [2],[3],[20]
Investment, Identifier [Axis]: When I Work, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.00% [17],[21],[34]   6.00% [17],[21],[34]   6.00% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (18,000)    
Ending balance $ (16,000) [17],[21],[34]   (16,000) [17],[21],[34]   $ (18,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Windows Entities, LLC Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[71]     121,419,000    
Ending balance 131,639,000 [17],[32],[72]   131,639,000 [17],[32],[72]   121,419,000 [3],[28],[71]
Investment, Identifier [Axis]: Wingspire Capital Holdings LLC          
Schedule of Investments [Line Items]          
Net change in unrealized gain (loss)     8,999,000   23,261,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance     431,531,000 $ 242,163,000 242,163,000
Gross Additions     53,000,000 [13]   201,107,000 [14]
Gross Reductions     (17,000,000) [15]   (35,000,000) [16]
Net change in unrealized gain (loss)     8,999,000   23,261,000
Ending balance 476,530,000   476,530,000   431,531,000
Interest income     0   0
Dividend income     18,000,000   36,500,000
Other income     0   0
Investment, Identifier [Axis]: Wingspire Capital Holdings LLC, LLC Interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [21],[29],[32],[55] $ 476,530,000   476,530,000    
Investment, Identifier [Axis]: Wingspire Capital Holdings LLC, LLC interest          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [1],[23],[26],[28]     $ 431,531,000    
Ending balance [1],[23],[26],[28]         $ 431,531,000
Investment, Identifier [Axis]: Zendesk, Inc., First lien senior secured delayed draw term loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[34],[35]   6.50% [17],[21],[34],[35]   6.50% [2],[3],[23],[40],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[40],[43]     $ (260,000)    
Ending balance $ (130,000) [17],[21],[34],[35]   $ (130,000) [17],[21],[34],[35]   $ (260,000) [2],[3],[23],[40],[43]
Investment, Identifier [Axis]: Zendesk, Inc., First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 7.00% [18],[31]   7.00% [18],[31]   6.50% [2],[3],[42]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[42]     $ 67,674,000    
Ending balance $ 68,791,000 [17],[18]   $ 68,791,000 [17],[18]   $ 67,674,000 [2],[3],[42]
Investment, Identifier [Axis]: Zendesk, Inc., First lien senior secured revolving loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate 6.50% [17],[21],[34]   6.50% [17],[21],[34]   6.50% [2],[3],[23],[43]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[23],[43]     $ (179,000)    
Ending balance $ (125,000) [17],[21],[34]   (125,000) [17],[21],[34]   $ (179,000) [2],[3],[23],[43]
Investment, Identifier [Axis]: Zenith Energy U.S. Logistics Holdings, LLC, First lien senior secured loan          
Schedule of Investments [Line Items]          
Basis spread, variable rate [2],[3],[33]         5.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [2],[3],[33]     58,042,000    
Ending balance [2],[3],[33]         $ 58,042,000
Investment, Identifier [Axis]: Zoro TopCo, Inc. (dba Zendesk, Inc.), Series A Preferred Stock          
Schedule of Investments [Line Items]          
Basis spread, variable rate [3],[28],[45]         12.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[28],[45]     9,220,000    
Ending balance [3],[28],[45]         $ 9,220,000
Investment, Identifier [Axis]: Zoro TopCo, Inc., Class A Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [30],[31],[32] 7,962,000   7,962,000    
Investment, Identifier [Axis]: Zoro TopCo, Inc., Series A Preferred Stock          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Ending balance [31],[32],[46] $ 10,072,000   10,072,000    
Investment, Identifier [Axis]: Zoro TopCo, L.P. (dba Zendesk, Inc.), Class A Common Units          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance [3],[27],[28]     $ 7,962,000    
Ending balance [3],[27],[28]         $ 7,962,000
[1] Investment is not pledged as collateral for the credit facilities.
[2] Loan contains a variable rate structure and may be subject to an interest rate floor. Variable rate loans bear interest at a rate that may be determined by reference to either the London Interbank Offered Rate (“LIBOR” or “L”, which can include one-, three-, six- or twelve- month LIBOR), Secured Overnight Financing Rate ("SOFR" or "S," which can include one-, three- or six- month SOFR), Euro Interbank Offered Rate (“EURIBOR”), Great Britain Pound London Interbank Offered Rate (“GBPLIBOR” or “G”, which can include three- or six-month GBPLIBOR), SONIA ("SONIA” or "SA") or an alternate base rate (which can include the Federal Funds Effective Rate or the Prime Rate), at the borrower’s option, and which reset periodically based on the terms of the loan agreement.
[3] Represents co-investment made with the Company’s affiliates in accordance with the terms of the exemptive relief that the Company received from the U.S. Securities and Exchange Commission. See Note 3 “Agreements and Related Party Transactions.”
[4] The interest rate on these loans is subject to 6 month LIBOR, which as of December 31, 2022 was 5.14%.
[5] This portfolio company is not a qualifying asset under Section 55(a) of the Investment Company Act of 1940, as amended (the “1940 Act”). Under the 1940 Act, the Company may not acquire any non-qualifying asset unless, at the time such acquisition is made, qualifying assets represent at least 70% of total assets. As of December 31, 2022, non-qualifying assets represented 13.5% of total assets as calculated in accordance with the regulatory requirements.
[6] Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 28 for additional information on our restricted securities.
[7] Unless otherwise indicated, all investments are considered Level 3 investments.
[8] Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See Note 6 “Debt”.
[9] Gross additions may include increases in the cost basis of investments resulting from new investments, amounts related to payment-in-kind (“PIK”) interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement at fair value of an existing portfolio company into this controlled affiliated category from a different category.
[10] Gross additions may include increases in the cost basis of investments resulting from new investments, amounts related to payment-in-kind (“PIK”) interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement at fair value of an existing portfolio company into this controlled affiliated category from a different category.
[11] Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, return of capital, the amortization of premiums and the exchange of one or more existing securities for one or more new securities.
[12] Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, return of capital, the amortization of premiums and the exchange of one or more existing securities for one or more new securities.
[13] Gross additions may include increases in the cost basis of investments resulting from new investments, amounts related to payment-in-kind (“PIK”) interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement at fair value of an existing portfolio company into this controlled affiliated category from a different category.
[14] Gross additions may include increases in the cost basis of investments resulting from new investments, amounts related to payment-in-kind (“PIK”) interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement at fair value of an existing portfolio company into this controlled affiliated category from a different category.
[15] Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, return of capital, the amortization of premiums and the exchange of one or more existing securities for one or more new securities.
[16] Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, return of capital, the amortization of premiums and the exchange of one or more existing securities for one or more new securities.
[17] Represents co-investment made with the Company’s affiliates in accordance with the terms of the exemptive relief that the Company received from the U.S. Securities and Exchange Commission. See Note 3 “Agreements and Related Party Transactions.”
[18] The interest rate on these loans is subject to 3 month SOFR, which as of June 30, 2023 was 5.27%.
[19] This portfolio company is not a qualifying asset under Section 55(a) of the Investment Company Act of 1940, as amended (the “1940 Act”). Under the 1940 Act, the Company may not acquire any non-qualifying asset unless, at the time such acquisition is made, qualifying assets represent at least 70% of total assets. As of June 30, 2023, non-qualifying assets represented 13.6% of total assets as calculated in accordance with the regulatory requirements.
[20] The interest rate on these loans is subject to 3 month LIBOR, which as of December 31, 2022 was 4.77%.
[21] Position or portion thereof is an unfunded loan or equity commitment. See Note 7 “Commitments and Contingencies”.
[22] The interest rate on these loans is subject to 1 month SOFR, which as of June 30, 2023 was 5.14%.
[23] Position or portion thereof is an unfunded loan or equity commitment. See Note 7 “Commitments and Contingencies”.
[24] In connection with its investment in AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC and AAM Series 2.1 Aviation Feeder, LLC (collectively, “Amergin Assetco”) the Company made a minority investment in Amergin Asset Management, LLC which has entered into a Servicing Agreement with Amergin Assetco.
[25] In connection with its investment in AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC and AAM Series 2.1 Aviation Feeder, LLC (collectively, “Amergin Assetco”) the Company made a minority investment in Amergin Asset Management, LLC which has entered into a Servicing Agreement with Amergin Assetco.
[26] As defined in the 1940 Act, the Company is deemed to be both an “Affiliated Person” and has “Control” of this portfolio company as the Company owns more than 25% of the portfolio company’s outstanding voting securities or has the power to exercise control over management or policies of such portfolio company, including through a management agreement (“controlled affiliate”). The Company’s investment in controlled affiliates for the period ended December 31, 2022, were as follows:
($ in thousands)Fair value
as of December 31, 2021
Gross Additions
(a)
Gross Reductions(b)Change in Unrealized Gains (Losses)Fair value
as of December 31, 2022
Interest IncomeDividend IncomeOther Income
Controlled Affiliates
AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC(d)
$— $$— $(5)$— $— $— $— 
AAM Series 2.1 Aviation Feeder, LLC(d)
— 1,574 — (6)1,568 — — — 
Fifth Season Investments LLC (fka Chapford SMA Partnership, L.P.)— 89,680 — — 89,680 — 201 — 
ORCC Senior Loan Fund LLC (fka Sebago Lake LLC)(c)
247,061 118,125 (49,000)(27,205)288,981 — 33,673 — 
PS Operating Company LLC (fka QC Supply, LLC)19,495 2,979 (1,444)(669)20,361 1,375 — 
Swipe Acquisition Corporation (dba PLI)108,061 4,284 (891)50,226 161,680 6,831 6,673 680 
Wingspire Capital Holdings LLC242,163 201,107 (35,000)23,261 431,531 — 36,500 — 
Total Controlled Affiliates$616,780 $417,754 $(86,335)$45,602 $993,801 $8,206 $77,047 $689 
________________
(a)Gross additions may include increases in the cost basis of investments resulting from new investments, amounts related to payment-in-kind (“PIK”) interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement at fair value of an existing portfolio company into this controlled affiliated category from a different category.
(b)Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, return of capital, the amortization of premiums and the exchange of one or more existing securities for one or more new securities.
(c)For further description of the Company's investment in ORCC Senior Loan Fund LLC (fka Sebago Lake LLC), see Note 4 "Investments."
(d)In connection with its investment in AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC and AAM Series 2.1 Aviation Feeder, LLC (collectively, “Amergin Assetco”) the Company made a minority investment in Amergin Asset Management, LLC which has entered into a Servicing Agreement with Amergin Assetco.
[27] Investment is non-income producing.
[28] Securities acquired in transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”) and may be deemed to be “restricted securities” under the Securities Act. As of December 31, 2022, the aggregate fair value of these securities is $1.6 billion or27.6% of the Company’s net assets. The acquisition dates of the restricted securities are as follows:
Portfolio CompanyInvestmentAcquisition Date
AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC**LLC InterestJuly 1, 2022
AAM Series 2.1 Aviation Feeder, LLC**LLC InterestJuly 1, 2022
Amergin Asset Management, LLCClass A UnitsJuly 1, 2022
Accelerate topco Holdings, LLCCommon UnitsSeptember 1, 2022
ASP Conair Holdings LPClass A UnitsMay 17, 2021
Associations Finance, Inc.Preferred StockJune 10, 2022
Windows EntitiesLLC UnitsJanuary 16, 2020
BCTO WIW Holdings, Inc. (dba When I Work)Class A Common StockNovember 2, 2021
BEHP Co-Investor II, L.P.LP InterestMay 11, 2022
WP Irving Co-Invest, L.P.Partnership UnitsMay 18, 2022
Blend Labs, Inc.WarrantsJuly 2, 2021
Brooklyn Lender Co-Invest 2, L.P. (dba Boomi)Common UnitsOctober 1, 2021
CD&R Value Building Partners I, L.P. (dba Belron)LP InterestDecember 2, 2021
Fifth Season Investments LLC (fka Chapford SMA Partnership, L.P.)**Class A UnitsJuly 18, 2022
Denali Holding, LP (dba Summit Companies)Class A UnitsSeptember 15, 2021
Dodge Construction Network Holdings, LPClass A-2 Common UnitsFebruary 23, 2022
Dodge Construction Network Holdings, LPSeries A Preferred UnitsFebruary 23, 2022
Elliott Alto Co-Investor Aggregator L.P.LP InterestSeptember 27, 2022
Picard Holdco, LLCSeries A Preferred StockSeptember 30, 2022
Evology, LLCClass B UnitsJanuary 24, 2022
Evolution Parent, LP (dba SIAA)LP InterestApril 30, 2021
Gloves Holdings, LP (dba Protective Industrial Products)LP InterestDecember 29, 2020
GrowthCurve Capital Sunrise Co-Invest LP (dba Brightway)LP InterestDecember 16, 2021
Hercules Buyer, LLC (dba The Vincit Group)Common UnitsDecember 15, 2020
Hissho Sushi Holdings, LLCClass A unitsMay 17, 2022
Insight CP (Blocker) Holdings, L.P. (dba CivicPlus, LLC)LP InterestJune 8, 2022
Knockout Intermediate Holdings I Inc. (dba Kaseya)Perpetual Preferred StockJune 23, 2022
KOBHG Holdings, L.P. (dba OB Hospitalist)Class A InterestsSeptember 27, 2021
Maia Aggregator, LPClass A-2 UnitsFebruary 1, 2022
H-Food Holdings, LLCLLC InterestNovember 23, 2018
LSI Financing 1 DAC**Preferred equityDecember 14, 2022
MessageBird Holding B.V.Extended Series C WarrantsMay 5, 2021
Metis HoldCo, Inc. (dba Mavis Tire Express Services)Series A Convertible Preferred StockMay 4, 2021
Minerva Holdco, Inc.Series A Preferred StockFebruary 15, 2022
KPCI Holdings, L.P.Class A UnitsNovember 30, 2020
Patriot Holdings SCSp (dba Corza Health, Inc.)Class B UnitsJanuary 29, 2021
Patriot Holdings SCSp (dba Corza Health, Inc.)Class A UnitsJanuary 29, 2021
PCF Holdco, LLC (dba PCF Insurance Services)Class A UnitsNovember 1, 2021
Project Alpine Co-Invest Fund,
LP
LP InterestJune 10, 2022
Project Hotel California Co-Invest Fund, L.P. LP InterestAugust 9, 2022
PS Op Holdings LLC (fka QC Supply, LLC)**Class A Common UnitsDecember 21, 2021
Rhea Acquisition Holdings, LPSeries A-2 UnitsFebruary 18, 2022
Blue Owl Capital Corporation Senior Loan Fund LLC (fka ORCC Senior Loan Fund LLC)*LLC InterestJune 20, 2017
Space Exploration Technologies Corp.Class A Common StockMarch 25, 2021
Space Exploration Technologies Corp.Class C Common StockMarch 25, 2021
Sunshine Software Holdings, Inc. (dba Cornerstone OnDemand)Series A Preferred StockOctober 14, 2021
New PLI Holdings, LLC (dba PLI)**Class A Common UnitsDecember 23, 2020
Portfolio CompanyInvestmentAcquisition Date
Thunder Topco L.P. (dba Vector Solutions)Common UnitsJune 30, 2021
VEPF Torreys Aggregator, LLC (dba MINDBODY, Inc.)Series A Preferred StockOctober 15, 2021
Wingspire Capital Holdings LLC**LLC InterestSeptember 24, 2019
WMC Bidco, Inc. (dba West Monroe)Senior Preferred StockNovember 9, 2021
Zoro TopCo, Inc. (dba Zendesk, Inc.)Series A Preferred StockNovember 22, 2022
Zoro TopCo, L.P. (dba Zendesk, Inc.)Class A Common UnitsNovember 22, 2022
* Refer to Note 4 “Investments – ORCC Senior Loan Fund LLC,” for further information.
** Refer to Note 3 “Agreements and Related Party Transactions – Controlled/Affiliated Portfolio Companies”.
[29] As defined in the 1940 Act, the Company is deemed to be both an “Affiliated Person” and has “Control” of this portfolio company as the Company owns more than 25% of the portfolio company’s outstanding voting securities or has the power to exercise control over management or policies of such portfolio company, including through a management agreement (“controlled affiliate”). The Company’s investment in controlled affiliates for the period ended June 30, 2023, were as follows:
($ in thousands)Fair value
as of December 31, 2022
Gross Additions
(a)
Gross Reductions(b)Change in Unrealized Gains (Losses)Fair value
as of June 30, 2023
Interest IncomeDividend IncomeOther Income
Controlled Affiliates
AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC(d)$— $6,115 $(35)$36 $6,116 $— $— $— 
AAM Series 2.1 Aviation Feeder, LLC(d)1,568 17,376 — — 18,944 — — — 
Eagle Infrastructure Super LLC— 109,909 (2)(64)109,843 2,976 — 
Fifth Season Investments LLC (fka Chapford SMA Partnership, L.P.)89,680 21,554 — — 111,234 — 1,360 — 
Blue Owl Capital Corporation Senior Loan Fund LLC (fka ORCC Senior Loan Fund LLC)(c)288,981 75,250 (8,750)8,947 364,428 — 20,659 — 
PS Operating Company LLC (fka QC Supply, LLC)20,361 24 (168)(384)19,833 963 — 
Swipe Acquisition Corporation (dba PLI)161,680 147 (890)(78)160,859 4,288 2,669 555 
Walker Edison Furniture Company, LLC— 56,042 — (1,075)54,967 — — 18 
Wingspire Capital Holdings LLC431,531 53,000 (17,000)8,999 476,530 — 18,000 — 
Total Controlled Affiliates$993,801 $339,417 $(26,845)$16,381 $1,322,754 $8,227 $42,688 $578 
________________
(a)Gross additions may include increases in the cost basis of investments resulting from new investments, amounts related to payment-in-kind (“PIK”) interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement at fair value of an existing portfolio company into this controlled affiliated category from a different category.
(b)Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, return of capital, the amortization of premiums and the exchange of one or more existing securities for one or more new securities.
(c)For further description of the Company's investment in Blue Owl Capital Corporation Senior Loan Fund (fka ORCC Senior Loan Fund), see Note 4 "Investments."
(d)In connection with its investment in AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC and AAM Series 2.1 Aviation Feeder, LLC (collectively, “Amergin Assetco”) the Company made a minority investment in Amergin Asset Management, LLC which has entered into a Servicing Agreement with Amergin Assetco.
[30] Investment is non-income producing.
[31] Represents co-investment made with the Company’s affiliates in accordance with the terms of the exemptive relief that the Company received from the U.S. Securities and Exchange Commission. See Note 3 “Agreements and Related Party Transactions.”
[32] Securities acquired in transactions exempt from registration under the Securities Act of 1933, as amended (the “Securities Act”) and may be deemed to be “restricted securities” under the Securities Act. As of June 30, 2023, the aggregate fair value of these securities is $1.9 billion or 31.9% of the Company’s net assets. The acquisition dates of the restricted securities are as follows:
Portfolio CompanyInvestmentAcquisition Date
AAM Series 1.1 Rail and Domestic Intermodal Feeder, LLC**LLC Interest7/1/2022
AAM Series 2.1 Aviation Feeder, LLC**LLC Interest7/1/2022
Amergin Asset Management, LLCClass A Units7/1/2022
Accelerate topco Holdings, LLCCommon Units9/1/2022
ASP Conair Holdings LPClass A Units5/17/2021
Associations Finance, Inc.Preferred Stock6/10/2022
Windows EntitiesLLC Units1/16/2020
BCTO WIW Holdings, Inc. (dba When I Work)Class A Common Stock11/2/2021
BEHP Co-Investor II, L.P.LP Interest5/11/2022
WP Irving Co-Invest, L.P.Partnership Units5/18/2022
Blend Labs, Inc.Warrants7/2/2021
Brooklyn Lender Co-Invest 2, L.P. (dba Boomi)Common Units10/1/2021
CD&R Value Building Partners I, L.P. (dba Belron)LP Interest12/2/2021
Fifth Season Investments LLC (fka Chapford SMA Partnership, L.P.)**Class A Units7/18/2022
Portfolio CompanyInvestmentAcquisition Date
Denali Holding, LP (dba Summit Companies)Class A Units9/15/2021
Dodge Construction Network Holdings, LPClass A-2 Common Units2/23/2022
Dodge Construction Network Holdings, LPSeries A Preferred Units2/23/2022
 Eagle Infrastructure Super LLC**Common Units3/31/2023
Elliott Alto Co-Investor Aggregator L.P.LP Interest9/27/2022
Picard Holdco, LLCSeries A Preferred Stock9/30/2022
Evology, LLCClass B Units1/24/2022
Evolution Parent, LP (dba SIAA)LP Interest4/30/2021
Gloves Holdings, LP (dba Protective Industrial Products)LP Interest12/29/2020
GrowthCurve Capital Sunrise Co-Invest LP (dba Brightway)LP Interest12/16/2021
Hercules Buyer, LLC (dba The Vincit Group)Common Units12/15/2020
Hissho Sushi Holdings, LLCClass A units5/17/2022
Insight CP (Blocker) Holdings, L.P. (dba CivicPlus, LLC)LP Interest6/8/2022
Knockout Intermediate Holdings I Inc. (dba Kaseya)Perpetual Preferred Stock6/23/2022
KOBHG Holdings, L.P. (dba OB Hospitalist)Class A Interests9/27/2021
Maia Aggregator, LPClass A-2 Units2/1/2022
H-Food Holdings, LLCLLC Interest11/23/2018
LSI Financing 1 DAC**Preferred equity12/14/2022
MessageBird Holding B.V.Extended Series C Warrants5/5/2021
Metis HoldCo, Inc. (dba Mavis Tire Express Services)Series A Convertible Preferred Stock5/4/2021
Minerva Holdco, Inc.Series A Preferred Stock2/15/2022
KPCI Holdings, L.P.Class A Units11/30/2020
Patriot Holdings SCSp (dba Corza Health, Inc.)Class B Units1/29/2021
Patriot Holdings SCSp (dba Corza Health, Inc.)Class A Units1/29/2021
PCF Holdco, LLC (dba PCF Insurance Services)Class A Units11/1/2021
Project Alpine Co-Invest Fund,
LP
LP Interest6/10/2022
Project Hotel California Co-Invest Fund, L.P. LP Interest8/9/2022
PS Op Holdings LLC (fka QC Supply, LLC)**Class A Common Units12/21/2021
Rhea Acquisition Holdings, LPSeries A-2 Units2/18/2022
Blue Owl Capital Corporation Senior Loan Fund LLC (fka ORCC Senior Loan Fund LLC)*LLC Interest6/20/2017
Space Exploration Technologies Corp.Class A Common Stock3/25/2021
Space Exploration Technologies Corp.Class C Common Stock3/25/2021
Sunshine Software Holdings, Inc. (dba Cornerstone OnDemand)Series A Preferred Stock10/14/2021
New PLI Holdings, LLC (dba PLI)**Class A Common Units12/23/2020
Thunder Topco L.P. (dba Vector Solutions)Common Units6/30/2021
VEPF Torreys Aggregator, LLC (dba MINDBODY, Inc.)Series A Preferred Stock10/15/2021
 Walker Edison Holdco LLC**Common Units3/1/2023
Wingspire Capital Holdings LLC**LLC Interest9/24/2019
WMC Bidco, Inc. (dba West Monroe)Senior Preferred Stock11/9/2021
Zoro TopCo, L.P.Series A Preferred Stock11/22/2022
Zoro TopCo, L.P.Class A Common Units11/22/2022
* Refer to Note 4 “Investments – Blue Owl Capital Corporation Senior Loan Fund LLC,” for further information.
** Refer to Note 3 “Agreements and Related Party Transactions – Controlled/Affiliated Portfolio Companies”.
[33] The interest rate on these loans is subject to 1 month LIBOR, which as of December 31, 2022 was 4.39%.
[34] The negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan. The negative fair value is the result of the capitalized discount on the loan.
[35] The date disclosed represents the commitment period of the unfunded term loan. Upon expiration of the commitment period, the funded portion of the term loan may be subject to a longer maturity date.
[36] The interest rate on these loans is subject to 1 month SOFR, which as of December 31, 2022 was 4.36%.
[37] The interest rate on these loans is subject to 6 month LIBOR, which as of June 30, 2023 was 5.76%.
[38] The interest rate on these loans is subject to Prime, which as of June 30, 2023 was 8.25%.
[39] The interest rate on these loans is subject to 6 month SOFR, which as of June 30, 2023 was 5.39%.
[40] The date disclosed represents the commitment period of the unfunded term loan. Upon expiration of the commitment period, the funded portion of the term loan may be subject to a longer maturity date.
[41] The interest rate on these loans is subject to 6 month SOFR, which as of December 31, 2022 was 4.78%.
[42] The interest rate on these loans is subject to 3 month SOFR, which as of December 31, 2022 was 4.59%.
[43] The negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan. The negative fair value is the result of the capitalized discount on the loan.
[44] The interest rate on these loans is subject to 3 month LIBOR, which as of June 30, 2023 was 5.55%.
[45] Contains a fixed-rate structure.
[46] Contains a fixed-rate structure.
[47] Level 2 investment.
[48] Level 2 investment.
[49] The interest rate on this loan is subject to 6 month EURIBOR, which as of June 30, 2023 was 3.90%.
[50] The interest rate on this loan is subject to 6 month EURIBOR, which as of December 31, 2022 was 2.69%.
[51] The interest rate on this loan is subject to 3 month EURIBOR, which as of December 31, 2022 was 2.13%.
[52] The interest rate on this loan is subject to SONIA, which as of June 30, 2023 was 4.93%.
[53] The interest rate on this loan is subject to SONIA, which as of December 31, 2022 was 3.43%.
[54] The interest rate on these loans is subject to 1 month LIBOR, which as of June 30, 2023 was 5.22%.
[55] Investment is not pledged as collateral for the credit facilities.
[56] Level 1 investment.
[57] Level 1 investment.
[58] For further description of the Company's investment in Blue Owl Capital Corporation Senior Loan Fund (fka ORCC Senior Loan Fund), see Note 4 "Investments."
[59] Investment measured at net asset value (“NAV”).
[60] Loan was on non-accrual status as of June 30, 2023.
[61] Loan was on non-accrual status as of December 31, 2022.
[62] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of this portfolio company as the Company owns more than 5% but less than 25% of the portfolio company's voting securities or has the power to exercise control over management or policies of such portfolio company, including through a management agreement (“non-controlled affiliate”). Transactions related to investments in non-controlled affiliates for the period ended December 31, 2022 were as follows:
($ in thousands)Fair value
as of December 31, 2021
Gross Additions
(a)
Gross Reductions(b)Change in Unrealized Gains (Losses)Fair value
as of December 31, 2022
Interest IncomeDividend IncomeOther Income
LSI Financing 1 DAC— 6,224 — (49)6,175 — — — 
Total Non-Controlled Affiliates$— $6,224 $— $(49)$6,175 $— $— $— 
________________
(a)Gross additions may include increases in the cost basis of investments resulting from new investments, amounts related to payment-in-kind (“PIK”) interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement at fair value of an existing portfolio company into this controlled affiliated category from a different category.
(b)Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, return of capital, the amortization of premiums and the exchange of one or more existing securities for one or more new securities.
[63] We invest in this portfolio company through underlying blocker entities Hercules Blocker 1 LLC, Hercules Blocker 2 LLC, Hercules Blocker 3 LLC, Hercules Blocker 4 LLC, and Hercules Blocker 5 LLC.
[64] We invest in this portfolio company through underlying blocker entities Hercules Blocker 1 LLC, Hercules Blocker 2 LLC, Hercules Blocker 3 LLC, Hercules Blocker 4 LLC, and Hercules Blocker 5 LLC.
[65] The interest rate on this loan is subject to 3 month EURIBOR, which as of June 30, 2023 was 3.58%.
[66] As defined in the 1940 Act, the Company is deemed to be an “affiliated person” of this portfolio company as the Company owns more than 5% but less than 25% of the portfolio company's voting securities or has the power to exercise control over management or policies of such portfolio company, including through a management agreement (“non-controlled affiliate”). Transactions related to investments in non-controlled affiliates for the period ended June 30, 2023 were as follows:
($ in thousands)Fair value
as of December 31, 2022
Gross Additions
(a)
Gross Reductions(b)Change in Unrealized Gains (Losses)Fair value
as of June 30, 2023
Interest IncomeDividend IncomeOther Income
LSI Financing 1 DAC6,175 15,045 (1,589)(5)19,626 — 177 — 
Total Non-Controlled Affiliates$6,175 $15,045 $(1,589)$(5)$19,626 $— $177 $— 
________________
(a)Gross additions may include increases in the cost basis of investments resulting from new investments, amounts related to payment-in-kind (“PIK”) interest capitalized and added to the principal balance of the respective loans, the accretion of discounts, the exchange of one or more existing investments for one or more new investments and the movement at fair value of an existing portfolio company into this controlled affiliated category from a different category.
(b)Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments and sales, return of capital, the amortization of premiums and the exchange of one or more existing securities for one or more new securities.
[67] The interest rate on this loan is subject to 1 month EURIBOR, which as of June 30, 2023 was 3.40%.
[68] For further description of the Company's investment in ORCC Senior Loan Fund LLC (fka Sebago Lake LLC), see Note 4 "Investments."
[69] Investment measured at net asset value (“NAV”).
[70] The interest rate on these loans is subject to Prime, which as of December 31, 2022 was 7.50%.
[71] Investment represents multiple underlying investments, including Midwest Custom Windows, LLC, Greater Toronto Custom Windows, Corp., Garden State Custom Windows, LLC, Long Island Custom Windows, LLC, Jemico, LLC, Atlanta Custom Windows, LLC and Fairchester Custom Windows (collectively, “Windows Entities”). Greater Toronto Custom Windows, Corp. is considered a non-qualifying asset, with a fair value of $9.1 million as of December 31, 2022.
[72] Investment represents multiple underlying investments, including Midwest Custom Windows, LLC, Greater Toronto Custom Windows, Corp., Garden State Custom Windows, LLC, Long Island Custom Windows, LLC, Jemico, LLC, Atlanta Custom Windows, LLC and Fairchester Custom Windows. Greater Toronto Custom Windows, Corp. is considered a non-qualifying asset, with a fair value of $9.9 million as of June 30, 2023.