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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
agreement
investment
Dec. 31, 2021
USD ($)
agreement
investment
Dec. 31, 2022
USD ($)
agreement
investment
Dec. 31, 2021
USD ($)
agreement
investment
Dec. 31, 2020
USD ($)
Dec. 31, 2022
GBP (£)
agreement
investment
Dec. 31, 2022
EUR (€)
agreement
investment
Jun. 30, 2022
USD ($)
Dec. 31, 2021
GBP (£)
agreement
investment
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | agreement 1 1 1 1   1 1   1      
Cost basis of securities purchased under collateralized agreements to resell $ 30,000 $ 30,000 $ 30,000 $ 30,000                
Fair value of securities purchased under collateralized agreements to resell 16,539 21,422 16,539 21,422                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,174,364 [1]                  
Net Change In Unrealized Appreciation (Depreciation)     (85,249) 92,305 $ (53,718)              
Fair Value, Ending Balance $ 3,221,247 [2] $ 3,174,364 [1] 3,221,247 [2] 3,174,364 [1]                
Net Realized Gains (Losses)     $ 53,530 $ (3,849) (2,802)              
Investments at fair value that are non-qualifying assets as a percentage of total assets 15.30% 18.00% 15.30% 18.00%   15.30% 15.30%   18.00%      
QID NGL, LLC | Common Class B                        
Ownership percentage     4.60% 4.60%                
QID TRH Holdings, LLC | Common Class B                        
Ownership percentage     97.00% 97.00%                
NMFC Senior Loan Program III LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Dividend Income     $ 17,485 $ 16,712 11,864              
NMFC Senior Loan Program IV LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Dividend Income   $ 7,767 13,173                  
Non-controlled/Affiliated                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     134,775 [3] 103,012                
Gross Additions     5,168 [4] 5,811 [5]                
Gross Redemptions     0 [6] (40,553) [7]                
Net Change In Unrealized Appreciation (Depreciation)     (9,156) 66,505                
Fair Value, Ending Balance $ 130,787 [8] 134,775 [3] 130,787 [8] 134,775 [3] 103,012              
Net Realized Gains (Losses)     0 8,338                
Interest Income     2,105 2,013                
Dividend Income     4,109 5,123                
Other Income     250 345 1,282              
Non-controlled/Affiliated | Permian Holdco 3, Inc. / Permian Trust                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0                  
Gross Additions     0 [4]                  
Gross Redemptions     0 [6]                  
Net Change In Unrealized Appreciation (Depreciation)     0                  
Fair Value, Ending Balance 0 0 0 0                
Net Realized Gains (Losses)     0                  
Interest Income     0                  
Dividend Income     0                  
Other Income     0                  
Non-controlled/Affiliated | Permian Holdco 1, Inc. / Permian Holdco 2, Inc. / Permian Holdco 3, Inc. / Permian Trust                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 0                
Gross Additions       225 [5]                
Gross Redemptions       (12,438) [7]                
Net Change In Unrealized Appreciation (Depreciation)       12,213                
Fair Value, Ending Balance   0   0 0              
Net Realized Gains (Losses)       (12,213)                
Interest Income       0                
Dividend Income       0                
Other Income       0                
Non-controlled/Affiliated | Sierra Hamilton Holdings Corporation                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     4,000 4,776                
Gross Additions     0 [4] 11 [5]                
Gross Redemptions     0 [6] (828) [7]                
Net Change In Unrealized Appreciation (Depreciation)     0 41                
Fair Value, Ending Balance 4,000 4,000 4,000 4,000 4,776              
Net Realized Gains (Losses)     0 2                
Interest Income     0 188                
Dividend Income     0 0                
Other Income     0 24                
Non-controlled/Affiliated | TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     130,775 98,236                
Gross Additions     5,168 [4] 5,575 [5]                
Gross Redemptions     0 [6] (27,287) [7]                
Net Change In Unrealized Appreciation (Depreciation)     (9,156) 54,251                
Fair Value, Ending Balance 126,787 130,775 126,787 130,775 98,236              
Net Realized Gains (Losses)     0 20,549                
Interest Income     2,105 1,825                
Dividend Income     4,109 5,123                
Other Income     250 321                
Controlled                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     755,810 [9] 600,875                
Gross Additions     22,952 [10] 266,592 [11]                
Gross Redemptions     (94,946) [12] (161,004) [13]                
Net Change In Unrealized Appreciation (Depreciation)     6,219 49,347                
Fair Value, Ending Balance 690,035 [14] 755,810 [9] 690,035 [14] 755,810 [9] 600,875              
Net Realized Gains (Losses)     53,440 (9,035)                
Interest Income     13,954 19,797                
Dividend Income     47,512 46,156                
Other Income     7,146 4,580 7,339              
Controlled | Edmentum Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 0                
Gross Additions     0 [10] 0 [11]                
Gross Redemptions     0 [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     0 0                
Fair Value, Ending Balance 0 0 0 0 0              
Net Realized Gains (Losses)     54 2,207                
Interest Income     0 0                
Dividend Income     0 0                
Other Income     0 1,200                
Controlled | National HME, Inc./NHME Holdings Corp.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     27,347 27,530                
Gross Additions     (8,161) [10] 8,094 [11]                
Gross Redemptions     0 [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (13,805) (8,277)                
Fair Value, Ending Balance 5,381 27,347 5,381 27,347 27,530              
Net Realized Gains (Losses)     0 0                
Interest Income     (9,661) 4,594                
Dividend Income     0 0                
Other Income     (1,500) 500                
Controlled | New Benevis Topco, LLC / New Benevis Holdco, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     109,595 98,442                
Gross Additions     5,914 [10] 5,417 [11]                
Gross Redemptions     0 [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (1,363) 5,736                
Fair Value, Ending Balance 114,146 109,595 114,146 109,595 98,442              
Net Realized Gains (Losses)     0 0                
Interest Income     8,057 6,956                
Dividend Income     0 0                
Other Income     1,500 1,500                
Controlled | New Permian Holdco, Inc. / New Permian Holdco, L.L.C.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     34,759 29,336                
Gross Additions     7,805 [10] 5,423 [11]                
Gross Redemptions     0 [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     15,000 0                
Fair Value, Ending Balance 57,564 34,759 57,564 34,759 29,336              
Net Realized Gains (Losses)     0 0                
Interest Income     4,504 3,522                
Dividend Income     0 0                
Other Income     511 634                
Controlled | NM APP CANADA CORP                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,422 12,302                
Gross Additions     0 [10] 0 [11]                
Gross Redemptions     (7,345) [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (2,077) (2,880)                
Fair Value, Ending Balance 0 9,422 0 9,422 12,302              
Net Realized Gains (Losses)     4,212 0                
Interest Income     0 0                
Dividend Income     620 978                
Other Income     713 0                
Controlled | NM APP US LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     14,891 7,410                
Gross Additions     0 [10] 0 [11]                
Gross Redemptions     (5,080) [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (9,811) 7,481                
Fair Value, Ending Balance 0 14,891 0 14,891 7,410              
Net Realized Gains (Losses)     4,489 0                
Interest Income     0 0                
Dividend Income     255 561                
Other Income     483 0                
Controlled | NM CLFX LP                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     24,676 14,885                
Gross Additions     0 [10] 0 [11]                
Gross Redemptions     0 [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (8,504) 9,791                
Fair Value, Ending Balance 16,172 24,676 16,172 24,676 14,885              
Net Realized Gains (Losses)     0 0                
Interest Income     0 0                
Dividend Income     1,596 1,521                
Other Income     0 0                
Controlled | NM DRVT LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,984 7,084                
Gross Additions     0 [10] 0 [11]                
Gross Redemptions     (5,152) [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (2,832) 900                
Fair Value, Ending Balance 0 7,984 0 7,984 7,084              
Net Realized Gains (Losses)     3,439 0                
Interest Income     0 0                
Dividend Income     173 466                
Other Income     475 0                
Controlled | NM JRA LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,996 3,830                
Gross Additions     0 [10] 0 [11]                
Gross Redemptions     (2,043) [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (1,953) 166                
Fair Value, Ending Balance 0 3,996 0 3,996 3,830              
Net Realized Gains (Losses)     2,049 0                
Interest Income     0 0                
Dividend Income     72 268                
Other Income     188 0                
Controlled | NM GLCR LP                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     50,687 29,130                
Gross Additions     0 [10] 0 [11]                
Gross Redemptions     (14,750) [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (35,937) 21,557                
Fair Value, Ending Balance 0 50,687 0 50,687 29,130              
Net Realized Gains (Losses)     35,713 0                
Interest Income     0 0                
Dividend Income     400 1,892                
Other Income     2,150 0                
Controlled | NM KRLN LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     244 1,501                
Gross Additions     97 [10] 641 [11]                
Gross Redemptions     (9,319) [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     8,978 (1,898)                
Fair Value, Ending Balance 0 244 0 244 1,501              
Net Realized Gains (Losses)     (9,318) 0                
Interest Income     0 0                
Dividend Income     0 0                
Other Income     0 0                
Controlled | NM NL Holdings, L.P.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     107,870 67,132                
Gross Additions     53 [10] 32,757 [11]                
Gross Redemptions     (10,885) [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (2,733) 7,981                
Fair Value, Ending Balance 94,305 107,870 94,305 107,870 67,132              
Net Realized Gains (Losses)     0 0                
Interest Income     0 0                
Dividend Income     8,453 7,414                
Other Income     0 0                
Controlled | NM GP Holdco, LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,197 703                
Gross Additions     1 [10] 415 [11]                
Gross Redemptions     (138) [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     (32) 79                
Fair Value, Ending Balance 1,028 1,197 1,028 1,197 703              
Net Realized Gains (Losses)     0 0                
Interest Income     0 0                
Dividend Income     94 52                
Other Income     0 0                
Controlled | NM YI LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     8,286 6,852                
Gross Additions     0 [10] 0 [11]                
Gross Redemptions     0 [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     1,195 1,434                
Fair Value, Ending Balance 9,481 8,286 9,481 8,286 6,852              
Net Realized Gains (Losses)     0 0                
Interest Income     0 0                
Dividend Income     828 877                
Other Income     0 0                
Controlled | NMFC Senior Loan Program I LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 23,000                
Gross Additions       10,000 [11]                
Gross Redemptions       (33,000) [13]                
Net Change In Unrealized Appreciation (Depreciation)       0                
Fair Value, Ending Balance   0   0 23,000              
Net Realized Gains (Losses)       0                
Interest Income       0                
Dividend Income       741                
Other Income       0                
Controlled | NMFC Senior Loan Program II LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 79,400                
Gross Additions       0 [11]                
Gross Redemptions       (79,400) [13]                
Net Change In Unrealized Appreciation (Depreciation)       0                
Fair Value, Ending Balance   0   0 79,400              
Net Realized Gains (Losses)       0                
Interest Income       0                
Dividend Income       2,410                
Other Income       0                
Controlled | NMFC Senior Loan Program III LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     140,000 120,000                
Gross Additions     0 [10] 20,000 [11]                
Gross Redemptions     0 [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     0 0                
Fair Value, Ending Balance 140,000 140,000 140,000 140,000 120,000              
Net Realized Gains (Losses)     0 0                
Interest Income     0 0                
Dividend Income     17,485 16,712                
Other Income     0 0                
Controlled | NMFC Senior Loan Program IV LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     112,400 0                
Gross Additions     0 [10] 112,400 [11]                
Gross Redemptions     0 [12] 0 [13]                
Net Change In Unrealized Appreciation (Depreciation)     0 0                
Fair Value, Ending Balance 112,400 112,400 112,400 112,400 0              
Net Realized Gains (Losses)     0 0                
Interest Income     0 0                
Dividend Income     13,173 7,767                
Other Income     0 0                
Controlled | Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     34,821                  
Gross Additions     3,865 [10]                  
Gross Redemptions     (38,685) [12]                  
Net Change In Unrealized Appreciation (Depreciation)     35,787                  
Fair Value, Ending Balance 35,788 34,821 35,788 34,821                
Net Realized Gains (Losses)     12,802                  
Interest Income     6,316                  
Dividend Income     0                  
Other Income     1,902                  
Controlled | Tenawa Resource Management LLC / Tenawa Resource Holdings LLC / QID TRH Holdings LLC (C)                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     34,821 [15] 0 [15]                
Gross Additions       64,776 [11],[15]                
Gross Redemptions       (45,892) [13],[15]                
Net Change In Unrealized Appreciation (Depreciation)       15,937 [15]                
Fair Value, Ending Balance   34,821 [15]   34,821 [15] 0 [15]              
Net Realized Gains (Losses)       (11,243) [15]                
Interest Income       845 [15]                
Dividend Income       0 [15]                
Other Income       8 [15]                
Controlled | UniTek Global Services, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     67,635 72,338                
Gross Additions     13,378 [10] 6,669 [11]                
Gross Redemptions     (1,549) [12] (2,712) [13]                
Net Change In Unrealized Appreciation (Depreciation)     24,306 (8,660)                
Fair Value, Ending Balance 103,770 67,635 103,770 67,635 $ 72,338              
Net Realized Gains (Losses)     0 1                
Interest Income     4,738 3,880                
Dividend Income     4,363 4,497                
Other Income     724 738                
Investment, Identifier [Axis]: AAC Lender Holdings, LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[18]                  
Fair Value, Ending Balance 0 [19],[20],[21] 0 [16],[17],[18] 0 [19],[20],[21] 0 [16],[17],[18]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien                        
Principal amount or par value   20,843 [22],[23]   20,843 [22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     20,634 [22]                  
Fair Value, Ending Balance   20,634 [22]   20,634 [22]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 1                        
Principal amount or par value 12,357 [19],[20],[24],[25]   12,357 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 12,204 [19],[20],[25]   12,204 [19],[20],[25]                  
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 2                        
Principal amount or par value 4,009 [19],[24],[25],[26]   4,009 [19],[24],[25],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,959 [19],[25],[26]   3,959 [19],[25],[26]                  
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                        
Principal amount or par value 4,231 [19],[24],[25],[26]   4,231 [19],[24],[25],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (52) [19],[25],[26]   (52) [19],[25],[26]                  
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 1                        
Principal amount or par value 3,659 [19],[20],[24],[25] 3,659 [17],[23],[27] 3,659 [19],[20],[24],[25] 3,659 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (37) [17],[27]                  
Fair Value, Ending Balance (45) [19],[20],[25] (37) [17],[27] (45) [19],[20],[25] (37) [17],[27]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 2                        
Principal amount or par value 13,041 [19],[20],[24],[25] 25,420 [17],[23],[27] 13,041 [19],[20],[24],[25] 25,420 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (254) [17],[27]                  
Fair Value, Ending Balance (162) [19],[20],[25] (254) [17],[27] (162) [19],[20],[25] (254) [17],[27]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                        
Principal amount or par value 20,634 [19],[24],[28]   20,634 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 20,378 [19],[28]   20,378 [19],[28]                  
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                        
Principal amount or par value 9,797 [19],[24],[26]   9,797 [19],[24],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 9,676 [19],[26]   9,676 [19],[26]                  
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated                        
Principal amount or par value   11,110 [17],[23]   11,110 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,944 [17]                  
Fair Value, Ending Balance   10,944 [17]   10,944 [17]                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                        
Principal amount or par value 12,494 [19],[20],[24]   12,494 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 11,908 [19],[20]   11,908 [19],[20]                  
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                        
Principal amount or par value 4,900 [19],[24],[26]   4,900 [19],[24],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 4,670 [19],[26]   4,670 [19],[26]                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien                        
Principal amount or par value 22,082 [19],[24],[29] 22,306 [16],[23],[30] 22,082 [19],[24],[29] 22,306 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     22,083 [16],[30]                  
Fair Value, Ending Balance 21,338 [19],[29] 22,083 [16],[30] 21,338 [19],[29] 22,083 [16],[30]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                        
Principal amount or par value   59 [16],[17],[23],[27]   59 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     58 [16],[17],[27]                  
Fair Value, Ending Balance   58 [16],[17],[27]   58 [16],[17],[27]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 1                        
Principal amount or par value 2,840 [19],[20],[24],[25]   2,840 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 2,744 [19],[20],[25]   2,744 [19],[20],[25]                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 2                        
Principal amount or par value 259 [19],[20],[24],[25]   259 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 250 [19],[20],[25]   250 [19],[20],[25]                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 2,095 [19],[20],[24],[25] 2,354 [16],[17],[23],[27] 2,095 [19],[20],[24],[25] 2,354 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (24) [16],[17],[27]                  
Fair Value, Ending Balance (71) [19],[20],[25] (24) [16],[17],[27] (71) [19],[20],[25] (24) [16],[17],[27]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 5,386 [19],[20],[24],[25] 8,180 [16],[17],[23],[27] 5,386 [19],[20],[24],[25] 8,180 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (82) [16],[17],[27]                  
Fair Value, Ending Balance (181) [19],[20],[25] (82) [16],[17],[27] $ (181) [19],[20],[25] $ (82) [16],[17],[27]                
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares                        
Preferred equity dividend rate     11.75% 11.75%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 12,989 [16],[17],[31]                  
Fair Value, Ending Balance 14,068 [19],[20],[32] 12,989 [16],[17],[31] 14,068 [19],[20],[32] $ 12,989 [16],[17],[31]                
Investment, Identifier [Axis]: ADG, LLC, Second lien                        
Principal amount or par value 7,430 [19],[20],[24] 6,591 [16],[17],[23] 7,430 [19],[20],[24] 6,591 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,082 [16],[17]                  
Fair Value, Ending Balance 4,984 [19],[20] 6,082 [16],[17] 4,984 [19],[20] 6,082 [16],[17]                
Investment, Identifier [Axis]: Affinity Dental Management, Inc., First lien - Drawn                        
Principal amount or par value   1,738 [16],[17],[23],[27]   1,738 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,738 [16],[17],[27]                  
Fair Value, Ending Balance   1,738 [16],[17],[27]   1,738 [16],[17],[27]                
Investment, Identifier [Axis]: Affinity Dental Management, Inc., First lien 1                        
Principal amount or par value   33,281 [16],[23],[30]   33,281 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     33,281 [16],[30]                  
Fair Value, Ending Balance   33,281 [16],[30]   33,281 [16],[30]                
Investment, Identifier [Axis]: Affinity Dental Management, Inc., First lien 2                        
Principal amount or par value   10,482 [16],[23],[33]   10,482 [16],[23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,482 [16],[33]                  
Fair Value, Ending Balance   10,482 [16],[33]   10,482 [16],[33]                
Investment, Identifier [Axis]: AgKnowledge Holdings Company, Inc., First lien                        
Principal amount or par value   9,166 [16],[23],[30]   9,166 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,166 [16],[30]                  
Fair Value, Ending Balance   9,166 [16],[30]   9,166 [16],[30]                
Investment, Identifier [Axis]: AgKnowledge Holdings Company, Inc., First lien - Undrawn                        
Principal amount or par value   526 [16],[17],[23],[27]   526 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: Alegeus Technologies Holding Corp., First lien                        
Principal amount or par value   13,443 [16],[22],[23]   13,443 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,443 [16],[22]                  
Fair Value, Ending Balance   13,443 [16],[22]   13,443 [16],[22]                
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                        
Principal amount or par value 13,444 [19],[24],[28]   13,444 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 13,444 [19],[28]   13,444 [19],[28]                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 1                        
Principal amount or par value 1,969 [19],[20],[24],[25]   1,969 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (39) [19],[20],[25]   (39) [19],[20],[25]                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 2                        
Principal amount or par value 11,718 [19],[20],[24],[25]   11,718 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (234) [19],[20],[25]   (234) [19],[20],[25]                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                        
Principal amount or par value 22,321 [19],[24],[29]   22,321 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 21,875 [19],[29]   21,875 [19],[29]                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                        
Principal amount or par value 4,024 [19],[24],[29]   4,024 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,943 [19],[29]   3,943 [19],[29]                  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                        
Principal amount or par value 30,356   30,356                  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                        
Principal amount or par value 2,652 [19],[20],[21],[24],[25] 2,652 [16],[17],[18],[23],[27] 2,652 [19],[20],[21],[24],[25] 2,652 [16],[17],[18],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[18],[27]                  
Fair Value, Ending Balance 0 [19],[20],[21],[25] 0 [16],[17],[18],[27] 0 [19],[20],[21],[25] 0 [16],[17],[18],[27]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                        
Principal amount or par value 28,829 [19],[24],[29] 27,610 [16],[23],[30] 28,829 [19],[24],[29] 27,610 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     17,386 [16],[30]                  
Fair Value, Ending Balance 20,599 [19],[29] 17,386 [16],[30] 20,599 [19],[29] 17,386 [16],[30]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                        
Principal amount or par value 1,527 [19],[20],[24] 1,527 [16],[17],[23] 1,527 [19],[20],[24] 1,527 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17]                  
Fair Value, Ending Balance 0 [19],[20] 0 [16],[17] 0 [19],[20] 0 [16],[17]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                        
Principal amount or par value                   $ 13,059    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Non-accrual status                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 8,240   8,240                  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                        
Principal amount or par value 5,230 [19],[20],[24] 5,230 [16],[17],[23] 5,230 [19],[20],[24] 5,230 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17]                  
Fair Value, Ending Balance 0 [19],[20] 0 [16],[17] 0 [19],[20] 0 [16],[17]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated, Non-accrual status                        
Principal amount or par value                     $ 5,230  
Investment, Identifier [Axis]: Anaplan, Inc., First lien                        
Principal amount or par value 33,618 [19],[24],[29]   33,618 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 33,282 [19],[29]   33,282 [19],[29]                  
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     158                  
Fair Value, Ending Balance 158 [19],[34] 158 158 [19],[34] 158                
Investment, Identifier [Axis]: Ansira Holdings, Inc, First lien - Undrawn                        
Principal amount or par value 1,161 [19],[20],[24],[25]   1,161 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 0 [19],[20],[25]   0 [19],[20],[25]                  
Investment, Identifier [Axis]: Ansira Holdings, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 18,571   18,571                  
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien - Drawn                        
Principal amount or par value 313 [19],[20],[24],[25]   313 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 313 [19],[20],[25]   313 [19],[20],[25]                  
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 1                        
Principal amount or par value 32,953 [19],[24],[28] 31,793 [16],[22],[23] 32,953 [19],[24],[28] 31,793 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     24,025 [16],[22]                  
Fair Value, Ending Balance 14,829 [19],[28] 24,025 [16],[22] 14,829 [19],[28] 24,025 [16],[22]                
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 2                        
Principal amount or par value 8,316 [19],[20],[24] 8,033 [16],[17],[23] 8,316 [19],[20],[24] 8,033 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,071 [16],[17]                  
Fair Value, Ending Balance $ 3,742 [19],[20] $ 6,071 [16],[17] $ 3,742 [19],[20] $ 6,071 [16],[17]                
Investment, Identifier [Axis]: Appriss Health Holdings, Inc, Wholly-owned subsidiaries                        
Number of investments held | investment 2 2 2 2   2 2   2      
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc., Preferred shares                        
Preferred equity dividend rate     11.00% 11.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 2,466 [16],[17],[35]                  
Fair Value, Ending Balance $ 2,628 [19],[20] $ 2,466 [16],[17],[35] 2,628 [19],[20] $ 2,466 [16],[17],[35]                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien                        
Principal amount or par value 6,234 [19],[24],[28],[36] 6,250 [16],[22],[23],[35] 6,234 [19],[24],[28],[36] 6,250 [16],[22],[23],[35]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,187 [16],[22],[35]                  
Fair Value, Ending Balance 6,234 [19],[28],[36] 6,187 [16],[22],[35] 6,234 [19],[28],[36] 6,187 [16],[22],[35]                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                        
Principal amount or par value 417 [19],[20],[24],[25],[36] 417 [16],[17],[23],[27],[35] 417 [19],[20],[24],[25],[36] 417 [16],[17],[23],[27],[35]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (4) [16],[17],[27],[35]                  
Fair Value, Ending Balance 0 [19],[20],[25],[36] (4) [16],[17],[27],[35] 0 [19],[20],[25],[36] (4) [16],[17],[27],[35]                
Investment, Identifier [Axis]: Apptio, Inc., First lien                        
Principal amount or par value   11,203 [16],[22],[23]   11,203 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     11,203 [16],[22]                  
Fair Value, Ending Balance   11,203 [16],[22]   11,203 [16],[22]                
Investment, Identifier [Axis]: Apptio, Inc., First lien - Drawn                        
Principal amount or par value 1,240 [19],[20],[24],[25] 827 [16],[17],[23],[27] 1,240 [19],[20],[24],[25] 827 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     827 [16],[17],[27]                  
Fair Value, Ending Balance 1,240 [19],[20],[25] 827 [16],[17],[27] 1,240 [19],[20],[25] 827 [16],[17],[27]                
Investment, Identifier [Axis]: Apptio, Inc., First lien - Undrawn                        
Principal amount or par value 827 [19],[20],[24],[25] 1,240 [16],[17],[23],[27] 827 [19],[20],[24],[25] 1,240 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance 0 [19],[20],[25] 0 [16],[17],[27] 0 [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: Apptio, Inc., First lien 1                        
Principal amount or par value 5,703 [19],[24],[28]   5,703 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 5,703 [19],[28]   5,703 [19],[28]                  
Investment, Identifier [Axis]: Apptio, Inc., First lien 2                        
Principal amount or par value 5,500 [19],[24],[29]   5,500 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 5,500 [19],[29]   5,500 [19],[29]                  
Investment, Identifier [Axis]: Associations, Inc., First lien 3                        
Principal amount or par value   8,590 [16],[22],[23]   8,590 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     8,547 [16],[22]                  
Fair Value, Ending Balance   8,547 [16],[22]   8,547 [16],[22]                
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                        
Principal amount or par value 3,543 [19],[20],[24],[25] 3,543 [16],[17],[23],[27] 3,543 [19],[20],[24],[25] 3,543 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (18) [16],[17],[27]                  
Fair Value, Ending Balance 0 [19],[20],[25] (18) [16],[17],[27] 0 [19],[20],[25] (18) [16],[17],[27]                
Investment, Identifier [Axis]: Associations, Inc., First lien 1                        
Principal amount or par value 35,786 [19],[24],[29] 30,196 [16],[23],[30] 35,786 [19],[24],[29] 30,196 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     30,045 [16],[30]                  
Fair Value, Ending Balance 35,786 [19],[29] 30,045 [16],[30] 35,786 [19],[29] 30,045 [16],[30]                
Investment, Identifier [Axis]: Associations, Inc., First lien 2                        
Principal amount or par value 8,810 [19],[24],[28] 8,590 [16],[17],[23] 8,810 [19],[24],[28] 8,590 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     8,547 [16],[17]                  
Fair Value, Ending Balance 8,810 [19],[28] 8,547 [16],[17] 8,810 [19],[28] 8,547 [16],[17]                
Investment, Identifier [Axis]: Associations, Inc., First lien 3                        
Principal amount or par value 8,810 [19],[24],[29]   8,810 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 8,810 [19],[29]   8,810 [19],[29]                  
Investment, Identifier [Axis]: Associations, Inc., First lien 4                        
Principal amount or par value 5,321 [19],[24],[28] 5,188 [16],[22],[23] 5,321 [19],[24],[28] 5,188 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,162 [16],[22]                  
Fair Value, Ending Balance 5,321 [19],[28] 5,162 [16],[22] 5,321 [19],[28] 5,162 [16],[22]                
Investment, Identifier [Axis]: Associations, Inc., First lien 5                        
Principal amount or par value 4,233 [19],[24],[28] 4,127 [16],[22],[23] 4,233 [19],[24],[28] 4,127 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     4,106 [16],[22]                  
Fair Value, Ending Balance 4,233 [19],[28] 4,106 [16],[22] 4,233 [19],[28] 4,106 [16],[22]                
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                        
Principal amount or par value 34,459 [19],[24],[28] 34,459 [16],[22],[23] 34,459 [19],[24],[28] 34,459 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     34,459 [16],[22],[37]                  
Fair Value, Ending Balance 34,356 [19],[28],[38] 34,459 [16],[22],[37] 34,356 [19],[28],[38] $ 34,459 [16],[22],[37]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien                        
Principal amount or par value 3,454 [24],[29]   3,454 [24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,402 [29]   3,402 [29]                  
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                        
Principal amount or par value 320 [20],[24],[25]   320 [20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (5) [20],[25],[38]   (5) [20],[25],[38]                  
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                        
Principal amount or par value 22,069 [19],[24],[28]   22,069 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 21,694 [19],[28]   21,694 [19],[28]                  
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                        
Principal amount or par value 14,925 [19],[24],[29]   14,925 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 14,671 [19],[29]   14,671 [19],[29]                  
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                        
Principal amount or par value 3,538 [19],[20],[24],[25]   3,538 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (30) [19],[20],[25]   (30) [19],[20],[25]                  
Investment, Identifier [Axis]: Avalara, Inc., First lien 1                        
Principal amount or par value 22,500 [19],[24],[28]   22,500 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 22,307 [19],[28]   22,307 [19],[28]                  
Investment, Identifier [Axis]: Avalara, Inc., First lien 2                        
Principal amount or par value 12,880 [19],[24],[29]   12,880 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 12,769 [19],[29]   $ 12,769 [19],[29]                  
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                        
Preferred equity dividend rate     12.25% 12.25%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 9,701 [16],[17],[37],[39]                  
Fair Value, Ending Balance 10,748 [19],[20],[38],[40] 9,701 [16],[17],[37],[39] 10,748 [19],[20],[38],[40] $ 9,701 [16],[17],[37],[39]                
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Drawn                        
Principal amount or par value 1,212 [19],[20],[24],[25] 1,485 [16],[17],[23],[27] 1,212 [19],[20],[24],[25] 1,485 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,485 [16],[17],[27]                  
Fair Value, Ending Balance 1,177 [19],[20],[25] 1,485 [16],[17],[27] 1,177 [19],[20],[25] 1,485 [16],[17],[27]                
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Undrawn                        
Principal amount or par value 303 [19],[20],[24],[25] 30 [16],[17],[23],[27] 303 [19],[20],[24],[25] 30 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance (9) [19],[20],[25] 0 [16],[17],[27] (9) [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: Bluefin Holding, LLC, Second lien                        
Principal amount or par value 18,000 [19],[24],[28] 18,000 [16],[22],[23] 18,000 [19],[24],[28] 18,000 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,000 [16],[22]                  
Fair Value, Ending Balance 17,338 [19],[28] 18,000 [16],[22] 17,338 [19],[28] 18,000 [16],[22]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 1                        
Principal amount or par value 22,500 [19],[24],[41] 22,500 [23],[42] 22,500 [19],[24],[41] 22,500 [23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     22,613 [42]                  
Fair Value, Ending Balance 21,798 [19],[41] 22,613 [42] 21,798 [19],[41] 22,613 [42]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 2                        
Principal amount or par value 16,624 [19],[24],[29] 16,624 [23],[30] 16,624 [19],[24],[29] 16,624 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     16,707 [30]                  
Fair Value, Ending Balance 16,104 [19],[29] 16,707 [30] 16,104 [19],[29] 16,707 [30]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 3                        
Principal amount or par value 6,000 [19],[24],[28] 6,000 [22],[23] 6,000 [19],[24],[28] 6,000 [22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,030 [22]                  
Fair Value, Ending Balance 5,813 [19],[28] 6,030 [22] 5,813 [19],[28] 6,030 [22]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                        
Principal amount or par value 392 [19],[20],[24],[25]   392 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 392 [19],[20],[25]   392 [19],[20],[25]                  
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                        
Principal amount or par value 460 [19],[20],[24],[25]   460 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 0 [19],[20],[25]   0 [19],[20],[25]                  
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 1                        
Principal amount or par value   2,395 [16],[17],[23],[27]   2,395 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 2                        
Principal amount or par value   852 [16],[17],[23],[27]   852 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                        
Principal amount or par value 16,659 [19],[24],[29] 16,830 [16],[23],[30] 16,659 [19],[24],[29] 16,830 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     16,830 [16],[30]                  
Fair Value, Ending Balance 16,659 [19],[29] 16,830 [16],[30] 16,659 [19],[29] 16,830 [16],[30]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                        
Principal amount or par value 3,442 [19],[24],[29] 1,075 [16],[23],[30] 3,442 [19],[24],[29] 1,075 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,075 [16],[30]                  
Fair Value, Ending Balance 3,442 [19],[29] 1,075 [16],[30] 3,442 [19],[29] 1,075 [16],[30]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                        
Principal amount or par value 771 [19],[24],[29] 779 [16],[17],[23] 771 [19],[24],[29] 779 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     779 [16],[17]                  
Fair Value, Ending Balance 771 [19],[29] 779 [16],[17] 771 [19],[29] 779 [16],[17]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                        
Principal amount or par value 345 [19],[24],[29] 349 [16],[17],[23] 345 [19],[24],[29] 349 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     349 [16],[17]                  
Fair Value, Ending Balance 345 [19],[29] 349 [16],[17] 345 [19],[29] 349 [16],[17]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                        
Principal amount or par value 275 [19],[24],[29] 278 [16],[17],[23] 275 [19],[24],[29] 278 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     278 [16],[17]                  
Fair Value, Ending Balance 275 [19],[29] 278 [16],[17] 275 [19],[29] 278 [16],[17]                
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                        
Principal amount or par value 11,392 [19],[24],[29] 11,497 [16],[23],[30] 11,392 [19],[24],[29] 11,497 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     11,497 [16],[30]                  
Fair Value, Ending Balance 10,637 [19],[29] 11,497 [16],[30] 10,637 [19],[29] 11,497 [16],[30]                
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                        
Principal amount or par value 3,393 [19],[24],[29] 3,425 [16],[17],[23] 3,393 [19],[24],[29] 3,425 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,425 [16],[17]                  
Fair Value, Ending Balance 3,168 [19],[29] 3,425 [16],[17] 3,168 [19],[29] 3,425 [16],[17]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                        
Principal amount or par value 8,317 [19],[24],[29] 8,302 [16],[23],[30] 8,317 [19],[24],[29] 8,302 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     8,209 [16],[30]                  
Fair Value, Ending Balance 7,411 [19],[29] 8,209 [16],[30] 7,411 [19],[29] 8,209 [16],[30]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                        
Principal amount or par value 916 [19],[20],[24],[25] 906 [16],[17],[23],[27] 916 [19],[20],[24],[25] 906 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     896 [16],[17],[27]                  
Fair Value, Ending Balance 817 [19],[20],[25] 896 [16],[17],[27] 817 [19],[20],[25] 896 [16],[17],[27]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                        
Principal amount or par value 226 [19],[20],[24],[25] 226 [16],[17],[23],[27] 226 [19],[20],[24],[25] 226 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (3) [16],[17],[27]                  
Fair Value, Ending Balance (25) [19],[20],[25] (3) [16],[17],[27] (25) [19],[20],[25] (3) [16],[17],[27]                
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 1                        
Principal amount or par value 7,012 [19],[24],[26] 7,012 [16],[23],[33] 7,012 [19],[24],[26] 7,012 [16],[23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,012 [16],[33]                  
Fair Value, Ending Balance 6,923 [19],[26] 7,012 [16],[33] 6,923 [19],[26] 7,012 [16],[33]                
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 2                        
Principal amount or par value 4,453 [19],[20],[24] 4,453 [16],[17],[23] 4,453 [19],[20],[24] 4,453 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     4,453 [16],[17]                  
Fair Value, Ending Balance 4,396 [19],[20] 4,453 [16],[17] 4,396 [19],[20] 4,453 [16],[17]                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 1                        
Principal amount or par value 18,266 [19],[20],[24] 18,266 [16],[17],[23] 18,266 [19],[20],[24] 18,266 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,266 [16],[17]                  
Fair Value, Ending Balance 17,409 [19],[20] 18,266 [16],[17] 17,409 [19],[20] 18,266 [16],[17]                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 2                        
Principal amount or par value 7,500 [19],[24],[28] 7,500 [16],[22],[23] 7,500 [19],[24],[28] 7,500 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,500 [16],[22]                  
Fair Value, Ending Balance 7,148 [19],[28] 7,500 [16],[22] 7,148 [19],[28] 7,500 [16],[22]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien                        
Principal amount or par value 12,347 [19],[24],[41] 12,347 [16],[23],[42] 12,347 [19],[24],[41] 12,347 [16],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     12,271 [16],[42]                  
Fair Value, Ending Balance 12,347 [19],[41] 12,271 [16],[42] 12,347 [19],[41] 12,271 [16],[42]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                        
Principal amount or par value 850 [19],[20],[24],[25]   850 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 850 [19],[20],[25]   850 [19],[20],[25]                  
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                        
Principal amount or par value 637 [19],[20],[24],[25] 1,487 [16],[17],[23],[27] 637 [19],[20],[24],[25] 1,487 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (9) [16],[17],[27]                  
Fair Value, Ending Balance 0 [19],[20],[25] (9) [16],[17],[27] 0 [19],[20],[25] (9) [16],[17],[27]                
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                        
Principal amount or par value 11,974 [19],[24],[26] 12,096 [23],[33] 11,974 [19],[24],[26] 12,096 [23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     12,083 [33]                  
Fair Value, Ending Balance 11,490 [19],[26] 12,083 [33] 11,490 [19],[26] 12,083 [33]                
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                        
Principal amount or par value 9,767 [19],[24],[26] 9,767 [16],[23],[33] 9,767 [19],[24],[26] 9,767 [16],[23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,864 [16],[33]                  
Fair Value, Ending Balance 9,432 [19],[26] 9,864 [16],[33] 9,432 [19],[26] 9,864 [16],[33]                
Investment, Identifier [Axis]: Castle Management Borrower LLC, First lien                        
Principal amount or par value 14,288 [19],[24],[28] 14,590 [16],[23],[30] 14,288 [19],[24],[28] 14,590 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     12,794 [16],[30]                  
Fair Value, Ending Balance 13,605 [19],[28] 12,794 [16],[30] 13,605 [19],[28] 12,794 [16],[30]                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 1                        
Principal amount or par value 47,838 [20],[24] 47,838 [17],[23] 47,838 [20],[24] 47,838 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     43,293 [17]                  
Fair Value, Ending Balance 40,941 [20] 43,293 [17] 40,941 [20] 43,293 [17]                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 2                        
Principal amount or par value 7,500 [24],[28] 7,500 [22],[23] 7,500 [24],[28] 7,500 [22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,788 [22]                  
Fair Value, Ending Balance 6,419 [28] 6,788 [22] 6,419 [28] 6,788 [22]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC (f.k.a Ministry Brands, LLC), First lien                        
Principal amount or par value   2,872 [16],[23],[30]   2,872 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,872 [16],[30]                  
Fair Value, Ending Balance   2,872 [16],[30]   2,872 [16],[30]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC (f.k.a Ministry Brands, LLC), First lien - Undrawn                        
Principal amount or par value   1,000 [16],[17],[23],[27]   1,000 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC (f.k.a Ministry Brands, LLC), Second lien 1                        
Principal amount or par value   7,840 [16],[22],[23]   7,840 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,840 [16],[22]                  
Fair Value, Ending Balance   7,840 [16],[22]   7,840 [16],[22]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC (f.k.a Ministry Brands, LLC), Second lien 2                        
Principal amount or par value   2,160 [16],[17],[23]   2,160 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,160 [16],[17]                  
Fair Value, Ending Balance   2,160 [16],[17]   2,160 [16],[17]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien                        
Principal amount or par value 7,163 [19],[24],[29]   7,163 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 6,928 [19],[29]   6,928 [19],[29]                  
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                        
Principal amount or par value 425 [19],[20],[24],[25]   425 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (14) [19],[20],[25]   (14) [19],[20],[25]                  
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                        
Principal amount or par value 849 [19],[20],[24],[25]   849 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (28) [19],[20],[25]   (28) [19],[20],[25]                  
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien                        
Principal amount or par value   19,263 [16],[23],[33]   19,263 [16],[23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     19,263 [16],[33],[37]                  
Fair Value, Ending Balance   19,263 [16],[33],[37]   19,263 [16],[33],[37]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                        
Principal amount or par value 19,215 [19],[24],[26]   19,215 [19],[24],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 18,639 [19],[26]   18,639 [19],[26]                  
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                        
Principal amount or par value 3,208 [19],[24],[26]   3,208 [19],[24],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,112 [19],[26]   3,112 [19],[26]                  
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                        
Principal amount or par value 1,013 [19],[20],[24],[25] 1,013 [16],[17],[23],[27] 1,013 [19],[20],[24],[25] 1,013 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance 0 [19],[20],[25] 0 [16],[17],[27] 0 [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 1                        
Principal amount or par value 13,795 [19],[24],[41] 13,937 [16],[23],[42] 13,795 [19],[24],[41] 13,937 [16],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,937 [16],[42]                  
Fair Value, Ending Balance 13,795 [19],[41] 13,937 [16],[42] 13,795 [19],[41] 13,937 [16],[42]                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 2                        
Principal amount or par value 2,482 [19],[24],[41] 2,507 [16],[23],[42] 2,482 [19],[24],[41] 2,507 [16],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,507 [16],[42]                  
Fair Value, Ending Balance 2,482 [19],[41] 2,507 [16],[42] 2,482 [19],[41] 2,507 [16],[42]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien                        
Principal amount or par value   19,878 [23],[30]   19,878 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     19,803 [30]                  
Fair Value, Ending Balance   19,803 [30]   19,803 [30]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Drawn                        
Principal amount or par value 2,836 [19],[20],[24],[25] 1,919 [23] 2,836 [19],[20],[24],[25] 1,919 [23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,912                  
Fair Value, Ending Balance 2,781 [19],[20],[25] 1,912 2,781 [19],[20],[25] 1,912                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn                        
Principal amount or par value   3,005 [17],[23],[27]   3,005 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (11) [17],[27]                  
Fair Value, Ending Balance   (11) [17],[27]   (11) [17],[27]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 1                        
Principal amount or par value 450 [19],[20],[24],[25]   450 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (9) [19],[20],[25]   (9) [19],[20],[25]                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 2                        
Principal amount or par value 3,936 [19],[20],[24],[25]   3,936 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (59) [19],[20],[25]   (59) [19],[20],[25]                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                        
Principal amount or par value 19,660 [19],[24],[29]   19,660 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 19,278 [19],[29]   19,278 [19],[29]                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                        
Principal amount or par value 7,046 [19],[24],[29]   7,046 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 6,909 [19],[29]   6,909 [19],[29]                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 3                        
Principal amount or par value 3,273 [19],[20],[24]   3,273 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,209 [19],[20]   3,209 [19],[20]                  
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                        
Principal amount or par value 20,313 [20],[24] 20,313 [17],[23] 20,313 [20],[24] 20,313 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     20,465 [17]                  
Fair Value, Ending Balance 18,053 [20] 20,465 [17] 18,053 [20] 20,465 [17]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                        
Principal amount or par value 2,457 [19],[24],[25],[26]   2,457 [19],[24],[25],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (67) [19],[25],[26]   (67) [19],[25],[26]                  
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,405 [19],[20],[24],[25]   2,405 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (66) [19],[20],[25]   (66) [19],[20],[25]                  
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 2                        
Principal amount or par value 6,561 [19],[20],[24],[25]   6,561 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (180) [19],[20],[25]   (180) [19],[20],[25]                  
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                        
Principal amount or par value 18,760 [19],[24],[28]   18,760 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 18,246 [19],[28]   18,246 [19],[28]                  
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                        
Principal amount or par value 7,025 [19],[24],[26]   7,025 [19],[24],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 6,833 [19],[26]   6,833 [19],[26]                  
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First lien                        
Principal amount or par value 7,547 [24],[29]   7,547 [24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 7,434 [29]   7,434 [29]                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien                        
Principal amount or par value   13,277 [16],[22],[23]   13,277 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,144 [16],[22]                  
Fair Value, Ending Balance   13,144 [16],[22]   13,144 [16],[22]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn                        
Principal amount or par value 33 [19],[20],[24],[25]   33 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 32 [19],[20],[25]   32 [19],[20],[25]                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                        
Principal amount or par value 524 [19],[20],[24],[25] 986 [16],[17],[23],[27] 524 [19],[20],[24],[25] 986 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (10) [16],[17],[27]                  
Fair Value, Ending Balance (15) [19],[20],[25] (10) [16],[17],[27] (15) [19],[20],[25] (10) [16],[17],[27]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                        
Principal amount or par value 953 [19],[20],[24],[25] 1,638 [16],[17],[23],[27] 953 [19],[20],[24],[25] 1,638 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (16) [16],[17],[27]                  
Fair Value, Ending Balance (27) [19],[20],[25] (16) [16],[17],[27] (27) [19],[20],[25] $ (16) [16],[17],[27]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                        
Principal amount or par value 13,144 [19],[24],[28]   13,144 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 12,776 [19],[28]   12,776 [19],[28]                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                        
Principal amount or par value 1,107 [19],[24],[29]   1,107 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 1,076 [19],[29]   $ 1,076 [19],[29]                  
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                        
Preferred equity dividend rate     7.00% 7.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 60,180 [16],[17],[43]                  
Fair Value, Ending Balance 65,688 [19],[20],[44] 60,180 [16],[17],[43] 65,688 [19],[20],[44] $ 60,180 [16],[17],[43]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn                        
Principal amount or par value   4,026 [16],[17],[23],[27]   4,026 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,985 [16],[17],[27]                  
Fair Value, Ending Balance   3,985 [16],[17],[27]   3,985 [16],[17],[27]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien                        
Principal amount or par value 37,860 [19],[24],[29] 38,244 [16],[23],[30] 37,860 [19],[24],[29] 38,244 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     37,861 [16],[30]                  
Fair Value, Ending Balance 36,232 [19],[29] 37,861 [16],[30] 36,232 [19],[29] 37,861 [16],[30]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 1                        
Principal amount or par value 3,985 [19],[20],[24],[25]   3,985 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,814 [19],[20],[25]   3,814 [19],[20],[25]                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 2                        
Principal amount or par value 2,623 [19],[20],[24],[25]   2,623 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 2,510 [19],[20],[25]   2,510 [19],[20],[25]                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 1                        
Principal amount or par value 404 [19],[20],[24],[25] 3,027 [16],[17],[23],[27] 404 [19],[20],[24],[25] 3,027 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (30) [16],[17],[27]                  
Fair Value, Ending Balance (17) [19],[20],[25] (30) [16],[17],[27] (17) [19],[20],[25] (30) [16],[17],[27]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 2                        
Principal amount or par value 9,080 [19],[20],[24],[25] 9,080 [16],[17],[23],[27] 9,080 [19],[20],[24],[25] 9,080 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (91) [16],[17],[27]                  
Fair Value, Ending Balance $ (390) [19],[20],[25] $ (91) [16],[17],[27] $ (390) [19],[20],[25] $ (91) [16],[17],[27]                
Investment, Identifier [Axis]: Diamond Parent Holdings Corp, Wholly-owned subsidiaries                        
Number of investments held | investment 2 2 2 2   2 2   2      
Investment, Identifier [Axis]: Diligent Corporation, First lien                        
Number of investments held | investment 3 3 3 3   3 3   3      
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                        
Principal amount or par value $ 1,087 [19],[20],[24],[25]   $ 1,087 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 1,087 [19],[20],[25]   1,087 [19],[20],[25]                  
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn                        
Principal amount or par value 2,537 [19],[20],[24],[25],[45] $ 3,624 [16],[17],[23],[27] 2,537 [19],[20],[24],[25],[45] $ 3,624 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance 0 [19],[20],[25],[45] 0 [16],[17],[27] 0 [19],[20],[25],[45] 0 [16],[17],[27]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                        
Principal amount or par value 17,583 [19],[24],[29] 17,762 [16],[23],[30] 17,583 [19],[24],[29] 17,762 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     17,673 [16],[30]                  
Fair Value, Ending Balance 17,371 [19],[29] 17,673 [16],[30] 17,371 [19],[29] 17,673 [16],[30]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                        
Principal amount or par value 9,805 [19],[24],[29] 9,905 [16],[23],[30] 9,805 [19],[24],[29] 9,905 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,855 [16],[30]                  
Fair Value, Ending Balance 9,688 [19],[29] 9,855 [16],[30] 9,688 [19],[29] 9,855 [16],[30]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 3                        
Principal amount or par value 5,827 [19],[20],[24] 5,887 [16],[17],[23] 5,827 [19],[20],[24] 5,887 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,945 [16],[17]                  
Fair Value, Ending Balance 5,827 [19],[20] 5,945 [16],[17] $ 5,827 [19],[20] $ 5,945 [16],[17]                
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                        
Preferred equity dividend rate     10.50% 10.50%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 10,379 [16],[17],[46]                  
Fair Value, Ending Balance 11,304 [19],[20] 10,379 [16],[17],[46] 11,304 [19],[20] $ 10,379 [16],[17],[46]                
Investment, Identifier [Axis]: EAB Global, Inc., Second lien                        
Principal amount or par value 33,452 [19],[24],[29] 33,452 [16],[23],[30] 33,452 [19],[24],[29] 33,452 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     32,951 [16],[30]                  
Fair Value, Ending Balance 32,392 [19],[29] 32,951 [16],[30] 32,392 [19],[29] 32,951 [16],[30]                
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                        
Principal amount or par value 16,473 [19],[20],[24] 15,434 [16],[17],[23],[47] 16,473 [19],[20],[24] 15,434 [16],[17],[23],[47]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     15,841 [16],[17],[47]                  
Fair Value, Ending Balance 16,473 [19],[20] 15,841 [16],[17],[47] 16,473 [19],[20] 15,841 [16],[17],[47]                
Investment, Identifier [Axis]: Education Management Corporation, Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0                  
Fair Value, Ending Balance 0 [29] 0 0 [29] 0                
Investment, Identifier [Axis]: Education Management Corporation, Ordinary shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0                  
Fair Value, Ending Balance 0 [20] 0 0 [20] 0                
Investment, Identifier [Axis]: Education Management Corporation, Preferred shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0                  
Fair Value, Ending Balance 0 [29] 0 0 [29] 0                
Investment, Identifier [Axis]: Education Management Corporation, Preferred shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0                  
Fair Value, Ending Balance 0 [20] 0 0 [20] 0                
Investment, Identifier [Axis]: Education Management II LLC, First lien 1                        
Principal amount or par value 300 [24],[29],[48] 300 [23],[30] 300 [24],[29],[48] 300 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [30]                  
Fair Value, Ending Balance 0 [29],[48] 0 [30] 0 [29],[48] 0 [30]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 2                        
Principal amount or par value 169 [20],[24],[48] 169 [17],[23] 169 [20],[24],[48] 169 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [17]                  
Fair Value, Ending Balance 0 [20],[48] 0 [17] 0 [20],[48] 0 [17]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 3                        
Principal amount or par value 205 [24],[29],[48] 206 [23],[30] 205 [24],[29],[48] 206 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [30]                  
Fair Value, Ending Balance 0 [29],[48] 0 [30] 0 [29],[48] 0 [30]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 4                        
Principal amount or par value 115 [20],[24],[48] 116 [17],[23] 115 [20],[24],[48] 116 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [17]                  
Fair Value, Ending Balance 0 [20],[48] 0 [17] 0 [20],[48] 0 [17]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 5                        
Principal amount or par value 139 [24],[29],[48] 140 [23],[30] 139 [24],[29],[48] 140 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [30]                  
Fair Value, Ending Balance 0 [29],[48] 0 [30] 0 [29],[48] 0 [30]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 6                        
Principal amount or par value 79 [20],[24],[48] 79 [17],[23] 79 [20],[24],[48] 79 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [17]                  
Fair Value, Ending Balance 0 [20],[48] 0 [17] 0 [20],[48] 0 [17]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 7                        
Principal amount or par value 4 [24],[29],[48] 4 [23],[30] 4 [24],[29],[48] 4 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [30]                  
Fair Value, Ending Balance 0 [29],[48] 0 [30] 0 [29],[48] 0 [30]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 8                        
Principal amount or par value 2 [20],[24],[48] 2 [17],[23] 2 [20],[24],[48] 2 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [17]                  
Fair Value, Ending Balance 0 [20],[48] 0 [17] 0 [20],[48] 0 [17]                
Investment, Identifier [Axis]: Education Management II LLC, First lien, Non-accrual status                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 0   0                  
Investment, Identifier [Axis]: Energize Holdco LLC, Second lien                        
Principal amount or par value   7,950 [23],[30]   7,950 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,910 [30]                  
Fair Value, Ending Balance   7,910 [30]   7,910 [30]                
Investment, Identifier [Axis]: FR Arsenal Holdings II Corp., First lien                        
Principal amount or par value 14,582 [19],[24],[29] 14,884 [16],[23],[30] 14,582 [19],[24],[29] 14,884 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     14,520 [16],[30]                  
Fair Value, Ending Balance $ 13,123 [19],[29] 14,520 [16],[30] $ 13,123 [19],[29] 14,520 [16],[30]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien                        
Principal amount or par value   $ 10,500 [23],[42]   $ 10,500 [23],[42]                
Number of investments held | investment 2 2 2 2   2 2   2      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 10,395 [42]                  
Fair Value, Ending Balance   $ 10,395 [42]   $ 10,395 [42]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn                        
Principal amount or par value   2,618 [23],[27],[42]   2,618 [23],[27],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,592 [27],[42]                  
Fair Value, Ending Balance   2,592 [27],[42]   2,592 [27],[42]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 1                        
Principal amount or par value $ 490 [19],[20],[24],[25]   490 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 477 [19],[20],[25]   477 [19],[20],[25]                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 2                        
Principal amount or par value 589 [19],[20],[24],[25]   589 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 584 [19],[20],[25]   584 [19],[20],[25]                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                        
Principal amount or par value 910 [19],[20],[24],[25] 882 [23],[27],[42] 910 [19],[20],[24],[25] 882 [23],[27],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (9) [27],[42]                  
Fair Value, Ending Balance (25) [19],[20],[25] (9) [27],[42] (25) [19],[20],[25] (9) [27],[42]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                        
Principal amount or par value 5,165 [19],[20],[24],[25] 1,400 [17],[23],[27] 5,165 [19],[20],[24],[25] 1,400 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (14) [17],[27]                  
Fair Value, Ending Balance (52) [19],[20],[25] (14) [17],[27] (52) [19],[20],[25] (14) [17],[27]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 3                        
Principal amount or par value   3,500 [23],[27],[42]   3,500 [23],[27],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (35) [27],[42]                  
Fair Value, Ending Balance   (35) [27],[42]   (35) [27],[42]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                        
Principal amount or par value 10,395 [19],[24],[41]   10,395 [19],[24],[41]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 10,110 [19],[41]   10,110 [19],[41]                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                        
Principal amount or par value 3,489 [19],[24],[41]   3,489 [19],[24],[41]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,393 [19],[41]   3,393 [19],[41]                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                        
Principal amount or par value 3,467 [19],[24],[41]   3,467 [19],[24],[41]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,372 [19],[41]   3,372 [19],[41]                  
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,000 [42],[49]                  
Fair Value, Ending Balance 4,686 [19],[41] 5,000 [42],[49] 4,686 [19],[41] 5,000 [42],[49]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,095 [19],[20],[24],[25]   2,095 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (21) [19],[20],[25]   (21) [19],[20],[25]                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                        
Principal amount or par value 4,907 [19],[20],[24],[25]   4,907 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (49) [19],[20],[25]   (49) [19],[20],[25]                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                        
Principal amount or par value 31,968 [19],[24],[29]   31,968 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 31,648 [19],[29]   31,648 [19],[29]                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                        
Principal amount or par value 2,072 [19],[20],[24]   2,072 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 2,051 [19],[20]   2,051 [19],[20]                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn                        
Principal amount or par value 381 [19],[20],[24],[25]   381 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 372 [19],[20],[25]   372 [19],[20],[25]                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                        
Principal amount or par value 81 [19],[20],[24],[25] 2,861 [16],[17],[23],[27] 81 [19],[20],[24],[25] 2,861 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (29) [16],[17],[27]                  
Fair Value, Ending Balance (2) [19],[20],[25] (29) [16],[17],[27] (2) [19],[20],[25] (29) [16],[17],[27]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                        
Principal amount or par value 2,479 [19],[20],[24],[25] 8,343 [16],[17],[23],[27] 2,479 [19],[20],[24],[25] 8,343 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (83) [16],[17],[27]                  
Fair Value, Ending Balance (58) [19],[20],[25] (83) [16],[17],[27] (58) [19],[20],[25] (83) [16],[17],[27]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 3                        
Principal amount or par value 4,886 [19],[20],[24],[25]   4,886 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (114) [19],[20],[25]   (114) [19],[20],[25]                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                        
Principal amount or par value 17,529 [19],[24],[29] 10,298 [16],[22],[23] 17,529 [19],[24],[29] 10,298 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,195 [16],[22]                  
Fair Value, Ending Balance 17,119 [19],[29] 10,195 [16],[22] 17,119 [19],[29] 10,195 [16],[22]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                        
Principal amount or par value 10,195 [19],[24],[28] 10,298 [23] 10,195 [19],[24],[28] 10,298 [23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,195                  
Fair Value, Ending Balance 9,957 [19],[28] 10,195 9,957 [19],[28] 10,195                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                        
Principal amount or par value 875 [19],[20],[24]   875 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 855 [19],[20]   855 [19],[20]                  
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                        
Principal amount or par value 22,500 [19],[24],[41] 22,500 [23],[42] 22,500 [19],[24],[41] 22,500 [23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     22,500 [42]                  
Fair Value, Ending Balance 20,810 [19],[41] 22,500 [42] 20,810 [19],[41] 22,500 [42]                
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                        
Principal amount or par value 7,009 [19],[24],[29] 5,009 [23],[30] 7,009 [19],[24],[29] 5,009 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,009 [30]                  
Fair Value, Ending Balance 6,483 [19],[29] 5,009 [30] 6,483 [19],[29] 5,009 [30]                
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First lien 1                        
Principal amount or par value   21,718 [16],[23],[33]   21,718 [16],[23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     21,718 [16],[33]                  
Fair Value, Ending Balance   21,718 [16],[33]   21,718 [16],[33]                
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First lien 2                        
Principal amount or par value   18,303 [16],[23],[30]   18,303 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,303 [16],[30]                  
Fair Value, Ending Balance   18,303 [16],[30]   18,303 [16],[30]                
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First lien 3                        
Principal amount or par value   7,555 [16],[23],[30]   7,555 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,555 [16],[30]                  
Fair Value, Ending Balance   7,555 [16],[30]   7,555 [16],[30]                
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First lien 4                        
Principal amount or par value   5,031 [16],[23],[30]   5,031 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,031 [16],[30]                  
Fair Value, Ending Balance   5,031 [16],[30]   5,031 [16],[30]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn                        
Principal amount or par value   5,643 [16],[23],[27],[30]   5,643 [16],[23],[27],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,643 [16],[27],[30]                  
Fair Value, Ending Balance   5,643 [16],[27],[30]   5,643 [16],[27],[30]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 1                        
Principal amount or par value 16,611 [19],[24],[25],[29]   16,611 [19],[24],[25],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 16,411 [19],[25],[29]   16,411 [19],[25],[29]                  
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 2                        
Principal amount or par value 988 [19],[20],[24],[25]   988 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 976 [19],[20],[25]   976 [19],[20],[25]                  
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 757 [19],[24],[25],[29] 4,991 [16],[23],[27],[30] 757 [19],[24],[25],[29] 4,991 [16],[23],[27],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[27],[30]                  
Fair Value, Ending Balance (9) [19],[25],[29] 0 [16],[27],[30] (9) [19],[25],[29] 0 [16],[27],[30]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 2,963 [19],[20],[24],[25] 3,951 [16],[17],[23],[27] 2,963 [19],[20],[24],[25] 3,951 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance (36) [19],[20],[25] 0 [16],[17],[27] (36) [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                        
Principal amount or par value 21,885 [19],[24],[41] 22,108 [16],[23],[42] 21,885 [19],[24],[41] 22,108 [16],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     22,108 [16],[42]                  
Fair Value, Ending Balance 21,623 [19],[41] 22,108 [16],[42] 21,623 [19],[41] 22,108 [16],[42]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                        
Principal amount or par value 13,211 [19],[24],[29] 13,345 [16],[23],[30] 13,211 [19],[24],[29] 13,345 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,345 [16],[30]                  
Fair Value, Ending Balance 13,052 [19],[29] 13,345 [16],[30] 13,052 [19],[29] 13,345 [16],[30]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 3                        
Principal amount or par value 10,551 [19],[24],[29]   10,551 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 10,424 [19],[29]   10,424 [19],[29]                  
Investment, Identifier [Axis]: GEMS Menasa (Cayman) Limited, First lien                        
Principal amount or par value   10,534 [22],[23]   10,534 [22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,589 [22],[37]                  
Fair Value, Ending Balance   10,589 [22],[37]   10,589 [22],[37]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn                        
Principal amount or par value   2,811 [16],[17],[23],[27]   2,811 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,811 [16],[17],[27]                  
Fair Value, Ending Balance   2,811 [16],[17],[27]   2,811 [16],[17],[27]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                        
Principal amount or par value 5,917 [19],[20],[24],[25] 3,106 [16],[17],[23],[27] 5,917 [19],[20],[24],[25] 3,106 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance (53) [19],[20],[25] 0 [16],[17],[27] (53) [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                        
Principal amount or par value 67,275 [19],[24],[29] 67,966 [16],[23],[30] 67,275 [19],[24],[29] 67,966 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     67,966 [16],[30]                  
Fair Value, Ending Balance 66,675 [19],[29] 67,966 [16],[30] 66,675 [19],[29] 67,966 [16],[30]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                        
Principal amount or par value 21,745 [19],[24],[41] 21,968 [16],[23],[42] 21,745 [19],[24],[41] 21,968 [16],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     21,968 [16],[42]                  
Fair Value, Ending Balance 21,551 [19],[41] 21,968 [16],[42] 21,551 [19],[41] 21,968 [16],[42]                
Investment, Identifier [Axis]: Galway Borrower LLC, First lien - Undrawn 1                        
Principal amount or par value   1,865 [16],[17],[23],[27]   1,865 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (19) [16],[17],[27]                  
Fair Value, Ending Balance   (19) [16],[17],[27]   (19) [16],[17],[27]                
Investment, Identifier [Axis]: Galway Borrower LLC, First lien - Undrawn 2                        
Principal amount or par value   3,917 [16],[17],[23],[27]   3,917 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (39) [16],[17],[27]                  
Fair Value, Ending Balance   (39) [16],[17],[27]   (39) [16],[17],[27]                
Investment, Identifier [Axis]: Galway Borrower LLC, First lien 1                        
Principal amount or par value   24,279 [16],[23],[30]   24,279 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     24,036 [16],[30]                  
Fair Value, Ending Balance   24,036 [16],[30]   24,036 [16],[30]                
Investment, Identifier [Axis]: Galway Borrower LLC, First lien 2                        
Principal amount or par value   1,674 [16],[17],[23]   1,674 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,658 [16],[17]                  
Fair Value, Ending Balance   1,658 [16],[17]   1,658 [16],[17]                
Investment, Identifier [Axis]: Geo Parent Corporation, First lien                        
Principal amount or par value   9,810 [23],[30]   9,810 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,761 [30]                  
Fair Value, Ending Balance   9,761 [30]   9,761 [30]                
Investment, Identifier [Axis]: Granicus, Inc., First lien - Drawn                        
Principal amount or par value 810 [19],[20],[24],[25] 2,778 [16],[17],[23],[27] 810 [19],[20],[24],[25] 2,778 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,751 [16],[17],[27]                  
Fair Value, Ending Balance 810 [19],[20],[25] 2,751 [16],[17],[27] 810 [19],[20],[25] 2,751 [16],[17],[27]                
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn                        
Principal amount or par value 1,604 [19],[20],[24],[25]   1,604 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 0 [19],[20],[25]   0 [19],[20],[25]                  
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn 1                        
Principal amount or par value   2,414 [16],[17],[23],[27]   2,414 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (18) [16],[17],[27]                  
Fair Value, Ending Balance   (18) [16],[17],[27]   (18) [16],[17],[27]                
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn 2                        
Principal amount or par value   1,822 [16],[17],[23],[27]   1,822 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (18) [16],[17],[27]                  
Fair Value, Ending Balance   (18) [16],[17],[27]   (18) [16],[17],[27]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 1                        
Principal amount or par value 15,405 [19],[24],[26] 15,522 [16],[23],[33] 15,405 [19],[24],[26] 15,522 [16],[23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     15,406 [16],[33]                  
Fair Value, Ending Balance 15,405 [19],[26] 15,406 [16],[33] 15,405 [19],[26] 15,406 [16],[33]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 2                        
Principal amount or par value 5,959 [19],[24],[28] 6,004 [16],[17],[23] 5,959 [19],[24],[28] 6,004 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,959 [16],[17]                  
Fair Value, Ending Balance 5,959 [19],[28] 5,959 [16],[17] 5,959 [19],[28] 5,959 [16],[17]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 3                        
Principal amount or par value 5,877 [19],[24],[29] 5,922 [16],[23],[30] 5,877 [19],[24],[29] 5,922 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,878 [16],[30]                  
Fair Value, Ending Balance 5,877 [19],[29] 5,878 [16],[30] 5,877 [19],[29] $ 5,878 [16],[30]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 4                        
Principal amount or par value 4,579 [19],[24],[29]   4,579 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 4,579 [19],[29]   $ 4,579 [19],[29]                  
Investment, Identifier [Axis]: HB Wealth Management, LLC, Preferred shares                        
Preferred equity dividend rate     4.00% 4.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 4,834 [16],[37],[50],[51]                  
Fair Value, Ending Balance 5,126 [19],[52],[53] 4,834 [16],[37],[50],[51] 5,126 [19],[52],[53] $ 4,834 [16],[37],[50],[51]                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                        
Principal amount or par value 22,500 [19],[24],[41] 22,500 [23],[42] 22,500 [19],[24],[41] 22,500 [23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     22,509 [42]                  
Fair Value, Ending Balance 21,409 [19],[41] 22,509 [42] 21,409 [19],[41] 22,509 [42]                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                        
Principal amount or par value 4,208 [19],[24],[29] 4,208 [23],[30] 4,208 [19],[24],[29] 4,208 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     4,210 [30]                  
Fair Value, Ending Balance 4,004 [19],[29] 4,210 [30] 4,004 [19],[29] 4,210 [30]                
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 35,679 [19],[54]   35,679 [19],[54]                  
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Profit Interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 109 [19],[55]   109 [19],[55]                  
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                        
Principal amount or par value 8,000 [19],[20],[24],[25]   8,000 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 0 [19],[20],[25]   0 [19],[20],[25]                  
Investment, Identifier [Axis]: Hill International, Inc., First lien                        
Principal amount or par value   15,089 [16],[23],[30]   15,089 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     15,089 [16],[30]                  
Fair Value, Ending Balance   15,089 [16],[30]   15,089 [16],[30]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien                        
Principal amount or par value   29,429 [16],[23],[30]   29,429 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     29,133 [16],[30]                  
Fair Value, Ending Balance   29,133 [16],[30]   29,133 [16],[30]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Drawn                        
Principal amount or par value 919 [19],[20],[24],[25] 1,149 [16],[17],[23],[27] 919 [19],[20],[24],[25] 1,149 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,137 [16],[17],[27]                  
Fair Value, Ending Balance 906 [19],[20],[25] 1,137 [16],[17],[27] 906 [19],[20],[25] 1,137 [16],[17],[27]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                        
Principal amount or par value 1,379 [19],[20],[24],[25] 1,149 [16],[17],[23],[27] 1,379 [19],[20],[24],[25] 1,149 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (11) [16],[17],[27]                  
Fair Value, Ending Balance (19) [19],[20],[25] (11) [16],[17],[27] (19) [19],[20],[25] (11) [16],[17],[27]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                        
Principal amount or par value 29,134 [19],[24],[29]   29,134 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 28,731 [19],[29]   28,731 [19],[29]                  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                        
Principal amount or par value 4,257 [19],[24],[29]   4,257 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 4,198 [19],[29]   4,198 [19],[29]                  
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien                        
Principal amount or par value 12,974 [19],[24],[29]   12,974 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 12,845 [19],[29]   12,845 [19],[29]                  
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn                        
Principal amount or par value 294 [19],[20],[24],[25]   294 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 291 [19],[20],[25]   291 [19],[20],[25]                  
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 1,254 [19],[20],[24],[25]   1,254 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (13) [19],[20],[25]   (13) [19],[20],[25]                  
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 3,097 [19],[20],[24],[25]   3,097 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (31) [19],[20],[25]   (31) [19],[20],[25]                  
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                        
Principal amount or par value 22,500 [19],[24],[26] 22,500 [23],[33] 22,500 [19],[24],[26] 22,500 [23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     22,613 [33]                  
Fair Value, Ending Balance 21,168 [19],[26] 22,613 [33] 21,168 [19],[26] 22,613 [33]                
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                        
Principal amount or par value 3,000 [19],[20],[24] 3,000 [17],[23] 3,000 [19],[20],[24] 3,000 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,015 [17]                  
Fair Value, Ending Balance 2,822 [19],[20] 3,015 [17] 2,822 [19],[20] 3,015 [17]                
Investment, Identifier [Axis]: Infogain Corporation, First lien                        
Principal amount or par value   19,090 [16],[23],[30]   19,090 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,946 [16],[30]                  
Fair Value, Ending Balance   18,946 [16],[30]   18,946 [16],[30]                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Drawn                        
Principal amount or par value 1,068 [19],[20],[24],[25]   1,068 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 1,048 [19],[20],[25]   1,048 [19],[20],[25]                  
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                        
Principal amount or par value 2,759 [19],[20],[24],[25] 3,827 [16],[17],[23],[27] 2,759 [19],[20],[24],[25] 3,827 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (29) [16],[17],[27]                  
Fair Value, Ending Balance (52) [19],[20],[25] (29) [16],[17],[27] (52) [19],[20],[25] (29) [16],[17],[27]                
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                        
Principal amount or par value 18,898 [19],[24],[29]   18,898 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 18,545 [19],[29]   18,545 [19],[29]                  
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                        
Principal amount or par value 7,923 [19],[24],[28]   7,923 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 7,775 [19],[28]   7,775 [19],[28]                  
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                        
Principal amount or par value 17,245 [19],[20],[24]   17,245 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 16,846 [19],[20]   16,846 [19],[20]                  
Investment, Identifier [Axis]: Integro Parent Inc., First lien                        
Principal amount or par value   33,986 [16],[23],[30]   33,986 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     33,239 [16],[30]                  
Fair Value, Ending Balance   33,239 [16],[30]   33,239 [16],[30]                
Investment, Identifier [Axis]: Integro Parent Inc., First lien - Drawn                        
Principal amount or par value   6,743 [16],[17],[23],[27]   6,743 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,685 [16],[17],[27]                  
Fair Value, Ending Balance   6,685 [16],[17],[27]   6,685 [16],[17],[27]                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                        
Principal amount or par value 4,187 [19],[24],[29]   4,187 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 4,187 [19],[29]   4,187 [19],[29]                  
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                        
Principal amount or par value 827 [19],[20],[24]   827 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 828 [19],[20]   828 [19],[20]                  
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                        
Principal amount or par value 11,510 [19],[20],[24] 10,000 [16],[22],[23] 11,510 [19],[20],[24] 10,000 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,534 [16],[22]                  
Fair Value, Ending Balance 8,718 [19],[20] 9,534 [16],[22] 8,718 [19],[20] 9,534 [16],[22]                
Investment, Identifier [Axis]: Integro Parent Inc., Second lien, Non-accrual status                        
Principal amount or par value               $ 4,029        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,051   3,051                  
Investment, Identifier [Axis]: KAMC Holdings, Inc, Second lien 1                        
Principal amount or par value   18,750 [16],[23],[30]   18,750 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     16,352 [16],[30]                  
Fair Value, Ending Balance   16,352 [16],[30]   16,352 [16],[30]                
Investment, Identifier [Axis]: KAMC Holdings, Inc, Second lien 2                        
Principal amount or par value   18,750 [16],[22],[23]   18,750 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     16,352 [16],[22]                  
Fair Value, Ending Balance   16,352 [16],[22]   16,352 [16],[22]                
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 1                        
Principal amount or par value 18,750 [19],[24],[29]   18,750 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 15,938 [19],[29]   15,938 [19],[29]                  
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 2                        
Principal amount or par value 18,750 [19],[24],[28]   18,750 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 15,937 [19],[28]   15,937 [19],[28]                  
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien                        
Principal amount or par value   7,039 [16],[22],[23]   7,039 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,968 [16],[22]                  
Fair Value, Ending Balance   6,968 [16],[22]   6,968 [16],[22]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                        
Principal amount or par value 145 [19],[24],[25],[29] 402 [16],[17],[23],[27] 145 [19],[24],[25],[29] 402 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     398 [16],[17],[27]                  
Fair Value, Ending Balance 139 [19],[25],[29] 398 [16],[17],[27] 139 [19],[25],[29] 398 [16],[17],[27]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                        
Principal amount or par value 1,022 [19],[24],[25],[29] 403 [16],[17],[23],[27] 1,022 [19],[24],[25],[29] 403 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (4) [16],[17],[27]                  
Fair Value, Ending Balance (45) [19],[25],[29] (4) [16],[17],[27] (45) [19],[25],[29] (4) [16],[17],[27]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                        
Principal amount or par value 6,968 [19],[24],[28]   6,968 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 6,662 [19],[28]   6,662 [19],[28]                  
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                        
Principal amount or par value 801 [19],[24],[29]   801 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 766 [19],[29]   766 [19],[29]                  
Investment, Identifier [Axis]: Kaseya Inc., First lien                        
Principal amount or par value 63,093 [19],[24],[29],[56]   63,093 [19],[24],[29],[56]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 62,172 [19],[29],[56]   62,172 [19],[29],[56]                  
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn                        
Principal amount or par value   1,541 [16],[17],[23],[27]   1,541 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,541 [16],[17],[27]                  
Fair Value, Ending Balance   1,541 [16],[17],[27]   1,541 [16],[17],[27]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                        
Principal amount or par value 3,851 [19],[20],[24],[25] 2,129 [16],[17],[23],[27] 3,851 [19],[20],[24],[25] 2,129 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance (56) [19],[20],[25] 0 [16],[17],[27] (56) [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                        
Principal amount or par value 3,851 [19],[20],[24],[25] 2,312 [16],[17],[23],[27] 3,851 [19],[20],[24],[25] 2,312 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance (56) [19],[20],[25] 0 [16],[17],[27] (56) [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: Kaseya Inc., First lien 1                        
Principal amount or par value   29,094 [16],[22],[23]   29,094 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     29,094 [16],[22]                  
Fair Value, Ending Balance   29,094 [16],[22]   29,094 [16],[22]                
Investment, Identifier [Axis]: Kaseya Inc., First lien 2                        
Principal amount or par value   7,795 [16],[22],[23]   7,795 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,795 [16],[22]                  
Fair Value, Ending Balance   7,795 [16],[22]   7,795 [16],[22]                
Investment, Identifier [Axis]: Kaseya Inc., First lien 3                        
Principal amount or par value   3,405 [16],[17],[23]   3,405 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,405 [16],[17]                  
Fair Value, Ending Balance   3,405 [16],[17]   3,405 [16],[17]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien                        
Principal amount or par value 15,788 [19],[24],[41] 15,949 [23],[42] 15,788 [19],[24],[41] 15,949 [23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     15,870 [42]                  
Fair Value, Ending Balance 15,788 [19],[41] 15,870 [42] 15,788 [19],[41] 15,870 [42]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Drawn                        
Principal amount or par value   630 [17],[23],[27]   630 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     627 [17],[27]                  
Fair Value, Ending Balance   627 [17],[27]   627 [17],[27]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                        
Principal amount or par value 1,799 [19],[20],[24],[25] 1,169 [17],[23],[27] 1,799 [19],[20],[24],[25] 1,169 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (6) [17],[27]                  
Fair Value, Ending Balance 0 [19],[20],[25] (6) [17],[27] 0 [19],[20],[25] (6) [17],[27]                
Investment, Identifier [Axis]: Keystone Acquisition Corp., First lien                        
Principal amount or par value   23,981 [23],[30]   23,981 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     23,861 [30]                  
Fair Value, Ending Balance   23,861 [30]   23,861 [30]                
Investment, Identifier [Axis]: Keystone Acquisition Corp., Second lien                        
Principal amount or par value   4,500 [16],[23],[30]   4,500 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     4,500 [16],[30]                  
Fair Value, Ending Balance   4,500 [16],[30]   4,500 [16],[30]                
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc., Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 14,661 [19],[20],[56]   $ 14,661 [19],[20],[56]                  
Investment, Identifier [Axis]: Knockout Intermediate Holdings I, Preferred shares                        
Preferred equity dividend rate     11.75%                  
Investment, Identifier [Axis]: MED Parentco, LP, Second lien                        
Principal amount or par value 20,857 [24],[28] 20,857 [22],[23] $ 20,857 [24],[28] 20,857 [22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     20,883 [22]                  
Fair Value, Ending Balance 15,726 [28] 20,883 [22] 15,726 [28] 20,883 [22]                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                        
Principal amount or par value 2,002 [19],[20],[24],[25]   2,002 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (45) [19],[20],[25]   (45) [19],[20],[25]                  
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                        
Principal amount or par value   9,364 [16],[23],[27],[30]   9,364 [16],[23],[27],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[27],[30]                  
Fair Value, Ending Balance   0 [16],[27],[30]   0 [16],[27],[30]                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 2                        
Principal amount or par value 4,074 [19],[20],[24],[25] 2,002 [16],[17],[23],[27] 4,074 [19],[20],[24],[25] 2,002 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance (92) [19],[20],[25] 0 [16],[17],[27] (92) [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                        
Principal amount or par value 21,879 [19],[24],[41] 22,104 [16],[23],[42] 21,879 [19],[24],[41] 22,104 [16],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     22,104 [16],[42]                  
Fair Value, Ending Balance 21,383 [19],[41] 22,104 [16],[42] 21,383 [19],[41] 22,104 [16],[42]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                        
Principal amount or par value 4,615 [19],[24],[29] 6,205 [16],[23],[30] 4,615 [19],[24],[29] 6,205 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,205 [16],[30]                  
Fair Value, Ending Balance 4,511 [19],[29] 6,205 [16],[30] 4,511 [19],[29] 6,205 [16],[30]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                        
Principal amount or par value 3,173 [19],[24],[29] 818 [16],[17],[23] 3,173 [19],[24],[29] 818 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     818 [16],[17]                  
Fair Value, Ending Balance 3,101 [19],[29] 818 [16],[17] 3,101 [19],[29] 818 [16],[17]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                        
Principal amount or par value 3,664 [19],[20],[24] 319 [16],[23],[30] 3,664 [19],[20],[24] 319 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     319 [16],[30]                  
Fair Value, Ending Balance 3,581 [19],[20] 319 [16],[30] 3,581 [19],[20] 319 [16],[30]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                        
Principal amount or par value 810 [19],[20],[24]   810 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 791 [19],[20]   791 [19],[20]                  
Investment, Identifier [Axis]: NHME Holdings Corp., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,000 [16],[17],[57]                  
Fair Value, Ending Balance 0 [58] 2,000 [16],[17],[57] 0 [58] 2,000 [16],[17],[57]                
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     500 [16],[17],[57]                  
Fair Value, Ending Balance 0 [19],[20] 500 [16],[17],[57] 0 [19],[20] 500 [16],[17],[57]                
Investment, Identifier [Axis]: NM APP Canada Corp., Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,422 [16],[59]                  
Fair Value, Ending Balance 0 [19],[60] 9,422 [16],[59] 0 [19],[60] 9,422 [16],[59]                
Investment, Identifier [Axis]: NM APP US LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     14,891 [16],[59]                  
Fair Value, Ending Balance 0 [19],[60] 14,891 [16],[59] 0 [19],[60] 14,891 [16],[59]                
Investment, Identifier [Axis]: NM CLFX LP, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     24,676 [16],[59]                  
Fair Value, Ending Balance 16,172 [19],[60] 24,676 [16],[59] 16,172 [19],[60] 24,676 [16],[59]                
Investment, Identifier [Axis]: NM DRVT LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,984 [16],[59]                  
Fair Value, Ending Balance 0 [19],[60] 7,984 [16],[59] 0 [19],[60] 7,984 [16],[59]                
Investment, Identifier [Axis]: NM GLCR LP, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     50,687 [16],[59]                  
Fair Value, Ending Balance 0 [19],[60] 50,687 [16],[59] 0 [19],[60] 50,687 [16],[59]                
Investment, Identifier [Axis]: NM GP Holdco, LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,197 [16],[37],[59]                  
Fair Value, Ending Balance 1,028 [19],[38],[60] 1,197 [16],[37],[59] 1,028 [19],[38],[60] 1,197 [16],[37],[59]                
Investment, Identifier [Axis]: NM GRC Holdco, LLC, First lien 1                        
Principal amount or par value   38,561 [16],[23],[30]   38,561 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     38,561 [16],[30]                  
Fair Value, Ending Balance   38,561 [16],[30]   38,561 [16],[30]                
Investment, Identifier [Axis]: NM GRC Holdco, LLC, First lien 2                        
Principal amount or par value   10,718 [16],[23],[30]   10,718 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,718 [16],[30]                  
Fair Value, Ending Balance   10,718 [16],[30]   10,718 [16],[30]                
Investment, Identifier [Axis]: NM JRA LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,996 [16],[59]                  
Fair Value, Ending Balance 0 [19],[60] 3,996 [16],[59] 0 [19],[60] 3,996 [16],[59]                
Investment, Identifier [Axis]: NM KRLN LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     244 [16],[59]                  
Fair Value, Ending Balance 0 [19],[60] 244 [16],[59] 0 [19],[60] 244 [16],[59]                
Investment, Identifier [Axis]: NM NL Holdings, L.P., Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     107,870 [16],[37],[59]                  
Fair Value, Ending Balance 94,305 [19],[38],[60] 107,870 [16],[37],[59] 94,305 [19],[38],[60] 107,870 [16],[37],[59]                
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     8,286 [16],[59]                  
Fair Value, Ending Balance 9,481 [19],[60] 8,286 [16],[59] 9,481 [19],[60] 8,286 [16],[59]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Drawn                        
Principal amount or par value 1,635 [19],[20],[24],[25]   1,635 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 1,624 [19],[20],[25]   1,624 [19],[20],[25]                  
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Undrawn                        
Principal amount or par value 9,029 [19],[20],[24],[25] 10,664 [16],[17],[23],[27] 9,029 [19],[20],[24],[25] 10,664 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (160) [16],[17],[27]                  
Fair Value, Ending Balance (63) [19],[20],[25] (160) [16],[17],[27] (63) [19],[20],[25] (160) [16],[17],[27]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                        
Principal amount or par value 19,259 [19],[24],[28] 19,259 [16],[22],[23] 19,259 [19],[24],[28] 19,259 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,970 [16],[22]                  
Fair Value, Ending Balance 19,124 [19],[28] 18,970 [16],[22] 19,124 [19],[28] 18,970 [16],[22]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                        
Principal amount or par value 4,913 [19],[24],[29] 4,913 [16],[23],[30] 4,913 [19],[24],[29] 4,913 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     4,839 [16],[30]                  
Fair Value, Ending Balance 4,879 [19],[29] 4,839 [16],[30] 4,879 [19],[29] 4,839 [16],[30]                
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     140,000 [16],[17],[37]                  
Fair Value, Ending Balance 140,000 [19],[20],[38] 140,000 [16],[17],[37] 140,000 [19],[20],[38] 140,000 [16],[17],[37]                
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     112,400 [16],[17],[37]                  
Fair Value, Ending Balance 112,400 [19],[20],[38] 112,400 [16],[17],[37] 112,400 [19],[20],[38] 112,400 [16],[17],[37]                
Investment, Identifier [Axis]: National HME, Inc., Second lien                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 5,381   5,381                  
Other Income (1,500)                      
Investment, Identifier [Axis]: National HME, Inc., Second lien 1                        
Principal amount or par value 13,013 [19],[20],[24] 21,016 [16],[17],[23] 13,013 [19],[20],[24] 21,016 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,030 [16],[17]                  
Fair Value, Ending Balance 5,381 [19],[20] 13,030 [16],[17] 5,381 [19],[20] 13,030 [16],[17]                
Investment, Identifier [Axis]: National HME, Inc., Second lien 2                        
Principal amount or par value 14,500 [19],[20],[24] 15,148 [16],[17],[23] 14,500 [19],[20],[24] 15,148 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     11,817 [16],[17]                  
Fair Value, Ending Balance 0 [19],[20] 11,817 [16],[17] 0 [19],[20] 11,817 [16],[17]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                        
Principal amount or par value   3,992 [16],[17],[23]   3,992 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,992 [16],[17]                  
Fair Value, Ending Balance   3,992 [16],[17]   3,992 [16],[17]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                        
Principal amount or par value 35,541 [19],[24],[29] 33,133 [16],[23],[30] 35,541 [19],[24],[29] 33,133 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     33,133 [16],[30]                  
Fair Value, Ending Balance 35,541 [19],[29] 33,133 [16],[30] 35,541 [19],[29] 33,133 [16],[30]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                        
Principal amount or par value 8,720 [19],[24],[28] 8,129 [16],[22],[23] 8,720 [19],[24],[28] 8,129 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     8,129 [16],[22]                  
Fair Value, Ending Balance 8,720 [19],[28] 8,129 [16],[22] 8,720 [19],[28] 8,129 [16],[22]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                        
Principal amount or par value 4,282 [19],[20],[24]   4,282 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 4,282 [19],[20]   4,282 [19],[20]                  
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                        
Principal amount or par value 18,687 [19],[20],[24] 16,556 [16],[17],[23] 18,687 [19],[20],[24] 16,556 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,603 [16],[17]                  
Fair Value, Ending Balance 14,950 [19],[20] 13,603 [16],[17] 14,950 [19],[20] 13,603 [16],[17]                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     34,548 [16],[30]                  
Fair Value, Ending Balance 34,490 [19],[29] 34,548 [16],[30] 34,490 [19],[29] 34,548 [16],[30]                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     8,476 [16],[22]                  
Fair Value, Ending Balance 8,462 [19],[28] 8,476 [16],[22] 8,462 [19],[28] 8,476 [16],[22]                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 3                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,714 [16],[17]                  
Fair Value, Ending Balance 7,701 [19],[20] 7,714 [16],[17] 7,701 [19],[20] 7,714 [16],[17]                
Investment, Identifier [Axis]: New Permian Holdco, Inc., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     11,000 [16],[17]                  
Fair Value, Ending Balance 26,000 [19],[20] 11,000 [16],[17] 26,000 [19],[20] 11,000 [16],[17]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                        
Principal amount or par value 21,779 [19],[20],[24] 18,216 [16],[17],[23] 21,779 [19],[20],[24] 18,216 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,216 [16],[17]                  
Fair Value, Ending Balance 21,779 [19],[20] 18,216 [16],[17] 21,779 [19],[20] 18,216 [16],[17]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                        
Principal amount or par value 9,785 [19],[20],[24],[25] 5,543 [16],[17],[23],[27] 9,785 [19],[20],[24],[25] 5,543 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,543 [16],[17],[27]                  
Fair Value, Ending Balance 9,785 [19],[20],[25] 5,543 [16],[17],[27] 9,785 [19],[20],[25] 5,543 [16],[17],[27]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                        
Principal amount or par value 1,577 [19],[20],[24],[25] 4,977 [16],[17],[23],[27] 1,577 [19],[20],[24],[25] 4,977 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance 0 [19],[20],[25] 0 [16],[17],[27] 0 [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien                        
Principal amount or par value 26,762 [19],[24],[29] 26,762 [23],[30] 26,762 [19],[24],[29] 26,762 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     26,762 [30]                  
Fair Value, Ending Balance 20,101 [19],[29] 26,762 [30] 20,101 [19],[29] 26,762 [30]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien                        
Principal amount or par value   10,153 [16],[22],[23]   10,153 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,077 [16],[22]                  
Fair Value, Ending Balance   10,077 [16],[22]   10,077 [16],[22]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn                        
Principal amount or par value   147 [16],[17],[23],[27]   147 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     146 [16],[17],[27]                  
Fair Value, Ending Balance   146 [16],[17],[27]   146 [16],[17],[27]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 1                        
Principal amount or par value 876 [19],[20],[24],[25]   876 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 861 [19],[20],[25]   861 [19],[20],[25]                  
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 2                        
Principal amount or par value 147 [19],[20],[24],[25]   147 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 145 [19],[20],[25]   145 [19],[20],[25]                  
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 1                        
Principal amount or par value 587 [19],[20],[24],[25] 734 [16],[17],[23],[27] 587 [19],[20],[24],[25] 734 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (6) [16],[17],[27]                  
Fair Value, Ending Balance (10) [19],[20],[25] (6) [16],[17],[27] (10) [19],[20],[25] (6) [16],[17],[27]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 2                        
Principal amount or par value 734 [19],[20],[24],[25] 1,467 [16],[17],[23],[27] 734 [19],[20],[24],[25] 1,467 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (11) [16],[17],[27]                  
Fair Value, Ending Balance (12) [19],[20],[25] (11) [16],[17],[27] (12) [19],[20],[25] (11) [16],[17],[27]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                        
Principal amount or par value 10,051 [19],[24],[28]   10,051 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 9,882 [19],[28]   9,882 [19],[28]                  
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                        
Principal amount or par value 9,925 [19],[24],[28]   9,925 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 9,758 [19],[28]   9,758 [19],[28]                  
Investment, Identifier [Axis]: OA Buyer, Inc., First lien                        
Principal amount or par value   28,201 [23],[30],[61]   28,201 [23],[30],[61]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     27,919 [30],[61]                  
Fair Value, Ending Balance   27,919 [30],[61]   27,919 [30],[61]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                        
Principal amount or par value 3,600 [19],[20],[24],[25],[62] 3,600 [17],[23],[27],[61] 3,600 [19],[20],[24],[25],[62] 3,600 [17],[23],[27],[61]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (36) [17],[27],[61]                  
Fair Value, Ending Balance (29) [19],[20],[25],[62] (36) [17],[27],[61] (29) [19],[20],[25],[62] (36) [17],[27],[61]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                        
Principal amount or par value 27,989 [19],[24],[29]   27,989 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 27,763 [19],[29]   27,763 [19],[29]                  
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                        
Principal amount or par value 1,772 [19],[24],[29]   1,772 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 1,757 [19],[29]   1,757 [19],[29]                  
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,000 [17],[61]                  
Fair Value, Ending Balance 2,000 [19],[20],[62] 2,000 [17],[61] $ 2,000 [19],[20],[62] $ 2,000 [17],[61]                
Investment, Identifier [Axis]: OEC Holdco, LLC, Preferred shares                        
Preferred equity dividend rate     11.00% 11.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 7,142 [63],[64]                  
Fair Value, Ending Balance $ 7,214 [19],[65],[66] $ 7,142 [63],[64] $ 7,214 [19],[65],[66] $ 7,142 [63],[64]                
Investment, Identifier [Axis]: OEConnection LLC, Second lien                        
Number of investments held | investment 2 2 2 2   2 2   2      
Investment, Identifier [Axis]: OEConnection LLC, Second lien 1                        
Principal amount or par value $ 23,406 [19],[24],[29] $ 23,406 [23],[30] $ 23,406 [19],[24],[29] $ 23,406 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     23,171 [30]                  
Fair Value, Ending Balance 22,687 [19],[29] 23,171 [30] 22,687 [19],[29] 23,171 [30]                
Investment, Identifier [Axis]: OEConnection LLC, Second lien 2                        
Principal amount or par value 12,044 [19],[24],[29] 12,044 [23],[30] 12,044 [19],[24],[29] 12,044 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     11,924 [30]                  
Fair Value, Ending Balance 11,674 [19],[29] 11,924 [30] 11,674 [19],[29] 11,924 [30]                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien                        
Principal amount or par value 6,629 [19],[24],[26]   6,629 [19],[24],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 6,500 [19],[26]   6,500 [19],[26]                  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Drawn                        
Principal amount or par value 131 [19],[20],[24],[25]   131 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 129 [19],[20],[25]   129 [19],[20],[25]                  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 1                        
Principal amount or par value 355 [19],[20],[24],[25]   355 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (7) [19],[20],[25]   (7) [19],[20],[25]                  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 2                        
Principal amount or par value 885 [19],[24],[25],[26]   885 [19],[24],[25],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (17) [19],[25],[26]   (17) [19],[25],[26]                  
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                        
Principal amount or par value 14,500 [19],[20],[24] 14,500 [16],[17],[23] 14,500 [19],[20],[24] 14,500 [16],[17],[23]               $ 20,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,354 [16],[17]                  
Fair Value, Ending Balance 7,995 [19],[20] 10,354 [16],[17] 7,995 [19],[20] 10,354 [16],[17]                
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                        
Principal amount or par value 0 [24],[48],[67] 0 [23],[68],[69] 0 [24],[48],[67] 0 [23],[68],[69]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [68],[69]                  
Fair Value, Ending Balance 0 [48],[67] 0 [68],[69] 0 [48],[67] 0 [68],[69]                
Investment, Identifier [Axis]: Permian Trust, First lien 1                        
Principal amount or par value 247 [19],[24],[70] 247 [16],[23],[71] 247 [19],[24],[70] 247 [16],[23],[71]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[71]                  
Fair Value, Ending Balance 0 [19],[70] 0 [16],[71] 0 [19],[70] 0 [16],[71]                
Investment, Identifier [Axis]: Permian Trust, First lien 2                        
Principal amount or par value 3,409 [19],[20],[24] 3,409 [16],[17],[23] 3,409 [19],[20],[24] 3,409 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17]                  
Fair Value, Ending Balance 0 [19],[20] 0 [16],[17] 0 [19],[20] 0 [16],[17]                
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 1                        
Principal amount or par value 49,270 [19],[24],[29] 49,617 [16],[23],[30] 49,270 [19],[24],[29] 49,617 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     49,617 [16],[30]                  
Fair Value, Ending Balance 49,270 [19],[29] 49,617 [16],[30] 49,270 [19],[29] 49,617 [16],[30]                
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 2                        
Principal amount or par value 18,726 [19],[24],[29] 18,966 [16],[17],[23] 18,726 [19],[24],[29] 18,966 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,966 [16],[17]                  
Fair Value, Ending Balance 18,726 [19],[29] 18,966 [16],[17] 18,726 [19],[29] 18,966 [16],[17]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien                        
Principal amount or par value   13,628 [16],[22],[23],[72]   13,628 [16],[22],[23],[72]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,492 [16],[22],[72]                  
Fair Value, Ending Balance   13,492 [16],[22],[72]   13,492 [16],[22],[72]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                        
Principal amount or par value 2,446 [19],[20],[24],[25],[73] 2,446 [16],[17],[23],[27],[72] 2,446 [19],[20],[24],[25],[73] 2,446 [16],[17],[23],[27],[72]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (24) [16],[17],[27],[72]                  
Fair Value, Ending Balance (32) [19],[20],[25],[73] (24) [16],[17],[27],[72] (32) [19],[20],[25],[73] (24) [16],[17],[27],[72]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                        
Principal amount or par value 14,900 [19],[24],[28]   14,900 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 14,706 [19],[28]   14,706 [19],[28]                  
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                        
Principal amount or par value 2,042 [19],[24],[28]   2,042 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 2,016 [19],[28]   2,016 [19],[28]                  
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,000 [16],[17],[72]                  
Fair Value, Ending Balance 1,631 [19],[73],[74] 2,000 [16],[17],[72] $ 1,631 [19],[73],[74] $ 2,000 [16],[17],[72]                
Investment, Identifier [Axis]: Project Essential Super Parent, Inc., Preferred shares                        
Preferred equity variable rate margin     9.50% 9.50%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 10,586 [16],[17],[75]                  
Fair Value, Ending Balance 11,569 [19],[20],[76] 10,586 [16],[17],[75] 11,569 [19],[20],[76] $ 10,586 [16],[17],[75]                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien                        
Principal amount or par value 5,161 [19],[24],[29]   5,161 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 5,014 [19],[29]   5,014 [19],[29]                  
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Drawn                        
Principal amount or par value 422 [19],[20],[24],[25] 2,394 [16],[17],[23],[27] 422 [19],[20],[24],[25] 2,394 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,394 [16],[17],[27]                  
Fair Value, Ending Balance 410 [19],[20],[25] 2,394 [16],[17],[27] 410 [19],[20],[25] 2,394 [16],[17],[27]                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                        
Principal amount or par value 483 [19],[20],[24],[25]   483 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (14) [19],[20],[25]   (14) [19],[20],[25]                  
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn 1                        
Principal amount or par value   2,810 [16],[17],[23],[27]   2,810 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn 2                        
Principal amount or par value   905 [16],[17],[23],[27]   905 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: Quartz Holding Company, Second lien                        
Principal amount or par value 10,000 [19],[20],[24] 10,000 [16],[17],[23] 10,000 [19],[20],[24] 10,000 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,000 [16],[17]                  
Fair Value, Ending Balance 9,802 [19],[20] 10,000 [16],[17] 9,802 [19],[20] 10,000 [16],[17]                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                        
Principal amount or par value 2,981 [19],[20],[24],[25] 750 [17],[23],[27] 2,981 [19],[20],[24],[25] 750 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (4) [17],[27]                  
Fair Value, Ending Balance (25) [19],[20],[25] (4) [17],[27] (25) [19],[20],[25] (4) [17],[27]                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 1                        
Principal amount or par value 24,469 [19],[24],[28] 6,219 [22],[23] 24,469 [19],[24],[28] 6,219 [22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,188 [22]                  
Fair Value, Ending Balance 24,263 [19],[28] 6,188 [22] 24,263 [19],[28] 6,188 [22]                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 2                        
Principal amount or par value 12,652 [19],[24],[29] 4,776 [22],[23] 12,652 [19],[24],[29] 4,776 [22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     4,752 [22]                  
Fair Value, Ending Balance 12,546 [19],[29] 4,752 [22] 12,546 [19],[29] 4,752 [22]                
Investment, Identifier [Axis]: Restaurant Technologies, Inc., Second lien                        
Principal amount or par value   6,722 [23],[33]   6,722 [23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     6,722 [33]                  
Fair Value, Ending Balance   6,722 [33]   6,722 [33]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien                        
Principal amount or par value 6,975 [19],[24],[29] 5,756 [16],[23],[30] 6,975 [19],[24],[29] 5,756 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     5,728 [16],[30]                  
Fair Value, Ending Balance 6,861 [19],[29] 5,728 [16],[30] 6,861 [19],[29] 5,728 [16],[30]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                        
Principal amount or par value 512 [19],[20],[24],[25]   512 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (8) [19],[20],[25]   (8) [19],[20],[25]                  
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn 1                        
Principal amount or par value   512 [16],[17],[23],[27]   512 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (3) [16],[17],[27]                  
Fair Value, Ending Balance   (3) [16],[17],[27]   (3) [16],[17],[27]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn 2                        
Principal amount or par value   1,279 [16],[17],[23],[27]   1,279 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (6) [16],[17],[27]                  
Fair Value, Ending Balance   (6) [16],[17],[27]   (6) [16],[17],[27]                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,599 [16],[30]                  
Fair Value, Ending Balance 3,599 [19],[29] 3,599 [16],[30] 3,599 [19],[29] 3,599 [16],[30]                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     401 [16],[17]                  
Fair Value, Ending Balance 401 [19],[20] 401 [16],[17] 401 [19],[20] 401 [16],[17]                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Second lien                        
Principal amount or par value 5 [19],[20],[24] 5 [16],[17],[23] 5 [19],[20],[24] 5 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17]                  
Fair Value, Ending Balance 0 [19],[20] 0 [16],[17] 0 [19],[20] 0 [16],[17]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien                        
Principal amount or par value 10,458 [19],[24],[29] 7,224 [16],[23],[30] 10,458 [19],[24],[29] 7,224 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     7,115 [16],[30]                  
Fair Value, Ending Balance 10,019 [19],[29] 7,115 [16],[30] 10,019 [19],[29] 7,115 [16],[30]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 1                        
Principal amount or par value 212 [19],[20],[24],[25]   212 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 204 [19],[20],[25]   204 [19],[20],[25]                  
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 2                        
Principal amount or par value 79 [19],[20],[24],[25]   79 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 75 [19],[20],[25]   75 [19],[20],[25]                  
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 1                        
Principal amount or par value 347 [19],[20],[24],[25] 559 [16],[17],[23],[27] 347 [19],[20],[24],[25] 559 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (8) [16],[17],[27]                  
Fair Value, Ending Balance (15) [19],[20],[25] (8) [16],[17],[27] (15) [19],[20],[25] (8) [16],[17],[27]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 2                        
Principal amount or par value 868 [19],[20],[24],[25] 671 [16],[17],[23],[27] 868 [19],[20],[24],[25] 671 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (10) [16],[17],[27]                  
Fair Value, Ending Balance (36) [19],[20],[25] (10) [16],[17],[27] (36) [19],[20],[25] (10) [16],[17],[27]                
Investment, Identifier [Axis]: Spring Education Group, Inc (fka SSH Group Holdings, Inc.), Second lien                        
Principal amount or par value 21,959 [19],[24],[29] 21,959 [23],[30] 21,959 [19],[24],[29] 21,959 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     21,282 [30]                  
Fair Value, Ending Balance 21,324 [19],[29] 21,282 [30] 21,324 [19],[29] 21,282 [30]                
Investment, Identifier [Axis]: Stamps.com Inc., First lien                        
Principal amount or par value   37,273 [16],[22],[23]   37,273 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     36,900 [16],[22]                  
Fair Value, Ending Balance   36,900 [16],[22]   36,900 [16],[22]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien                        
Principal amount or par value 3,985 [19],[24],[29] 4,025 [16],[23],[30] 3,985 [19],[24],[29] 4,025 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,985 [16],[30]                  
Fair Value, Ending Balance 3,917 [19],[29] 3,985 [16],[30] 3,917 [19],[29] 3,985 [16],[30]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn                        
Principal amount or par value 2,791 [19],[24],[25],[29] 1,585 [16],[17],[23],[27] 2,791 [19],[24],[25],[29] 1,585 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,570 [16],[17],[27]                  
Fair Value, Ending Balance 2,744 [19],[25],[29] 1,570 [16],[17],[27] 2,744 [19],[25],[29] 1,570 [16],[17],[27]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 1                        
Principal amount or par value 559 [19],[20],[24],[25] 559 [16],[17],[23],[27] 559 [19],[20],[24],[25] 559 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (6) [16],[17],[27]                  
Fair Value, Ending Balance (9) [19],[20],[25] (6) [16],[17],[27] (9) [19],[20],[25] (6) [16],[17],[27]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 2                        
Principal amount or par value 152 [19],[24],[25],[29] 1,378 [16],[17],[23],[27] 152 [19],[24],[25],[29] 1,378 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (14) [16],[17],[27]                  
Fair Value, Ending Balance (3) [19],[25],[29] (14) [16],[17],[27] $ (3) [19],[25],[29] $ (14) [16],[17],[27]                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred Shares                        
Preferred equity variable rate margin     10.50%                  
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares                        
Preferred equity variable rate margin       10.50%                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 10,719 [16],[33]                  
Fair Value, Ending Balance 11,396 [19],[26] 10,719 [16],[33] 11,396 [19],[26] $ 10,719 [16],[33]                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,695 [16],[17]                  
Fair Value, Ending Balance 3,929 [19],[20] 3,695 [16],[17] 3,929 [19],[20] 3,695 [16],[17]                
Investment, Identifier [Axis]: Syndigo LLC, Second lien                        
Principal amount or par value   22,500 [23],[33]   22,500 [23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     22,528 [33]                  
Fair Value, Ending Balance   22,528 [33]   22,528 [33]                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                        
Principal amount or par value 22,500 [19],[24],[26]   22,500 [19],[24],[26]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 21,067 [19],[26]   21,067 [19],[26]                  
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                        
Principal amount or par value 5,697 [19],[24],[29]   5,697 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 5,334 [19],[29]   5,334 [19],[29]                  
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                        
Principal amount or par value   16,563 [16],[23],[30]   16,563 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,968 [16],[30]                  
Fair Value, Ending Balance   13,968 [16],[30]   13,968 [16],[30]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                        
Principal amount or par value 16,395 [19],[24],[29]   16,395 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 10,657 [19],[29]   10,657 [19],[29]                  
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                        
Principal amount or par value 15,813 [19],[24],[28] 15,975 [16],[22],[23] 15,813 [19],[24],[28] 15,975 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,473 [16],[22]                  
Fair Value, Ending Balance 10,277 [19],[28] 13,473 [16],[22] 10,277 [19],[28] $ 13,473 [16],[22]                
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC), Second lien                        
Principal amount or par value 7,950 [19],[24],[29]   7,950 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 7,488 [19],[29]   $ 7,488 [19],[29]                  
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                        
Ordinary shares dividend rate     12.00% 12.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 114,934 [16],[17],[47]                  
Fair Value, Ending Balance 110,314 [19],[20] 114,934 [16],[17],[47] 110,314 [19],[20] $ 114,934 [16],[17],[47]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien - Undrawn                        
Principal amount or par value 4,439 [19],[20],[24],[25] 4,439 [16],[17],[23],[27] 4,439 [19],[20],[24],[25] 4,439 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (44) [16],[17],[27],[37]                  
Fair Value, Ending Balance (71) [19],[20],[25],[38] (44) [16],[17],[27],[37] (71) [19],[20],[25],[38] (44) [16],[17],[27],[37]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 1                        
Principal amount or par value 35,000 [19],[24],[29] 35,000 [16],[23],[30] 35,000 [19],[24],[29] 35,000 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     34,650 [16],[30]                  
Fair Value, Ending Balance 34,436 [19],[29] 34,650 [16],[30] 34,436 [19],[29] 34,650 [16],[30]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 2                        
Principal amount or par value 24,189 [19],[24],[28] 24,189 [16],[22],[23] 24,189 [19],[24],[28] 24,189 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     23,947 [16],[22]                  
Fair Value, Ending Balance 23,800 [19],[28] 23,947 [16],[22] 23,800 [19],[28] 23,947 [16],[22]                
Investment, Identifier [Axis]: Tenawa Resource Holdings LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[77]                  
Fair Value, Ending Balance   0 [16],[77]   0 [16],[77]                
Investment, Identifier [Axis]: Tenawa Resource Holdings LLC, Profit Interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[78]                  
Fair Value, Ending Balance   0 [16],[78]   0 [16],[78]                
Investment, Identifier [Axis]: Tenawa Resource Management LLC, First lien - Undrawn                        
Principal amount or par value   8,000 [16],[17],[23],[27]   8,000 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: Tenawa Resource Management LLC, First lien 1                        
Principal amount or par value   31,624 [16],[17],[23]   31,624 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,821 [16],[17]                  
Fair Value, Ending Balance   18,821 [16],[17]   18,821 [16],[17]                
Investment, Identifier [Axis]: Tenawa Resource Management LLC, First lien 2                        
Principal amount or par value   16,000 [16],[17],[23]   16,000 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     16,000 [16],[17]                  
Fair Value, Ending Balance   16,000 [16],[17]   16,000 [16],[17]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Drawn 1                        
Principal amount or par value   5,103   5,103         £ 3,771 [16],[17],[23],[27],[79]      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     4,976 [16],[17],[27],[79]                  
Fair Value, Ending Balance   4,976 [16],[17],[27],[79]   4,976 [16],[17],[27],[79]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Drawn 2                        
Principal amount or par value   3,708 [16],[17],[23],[27]   3,708 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     3,652 [16],[17],[27]                  
Fair Value, Ending Balance   3,652 [16],[17],[27]   3,652 [16],[17],[27]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Undrawn                        
Principal amount or par value   12,884   12,884         9,521 [16],[17],[23],[27],[79]      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (143) [16],[17],[27],[79]                  
Fair Value, Ending Balance   (143) [16],[17],[27],[79]   (143) [16],[17],[27],[79]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                        
Principal amount or par value 15,562 17,428 15,562 17,428   £ 12,879 [19],[20],[24],[80]     £ 12,879 [16],[17],[23],[79]      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     17,167 [16],[17],[79]                  
Fair Value, Ending Balance 15,562 [19],[20],[80] 17,167 [16],[17],[79] 15,562 [19],[20],[80] 17,167 [16],[17],[79]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                        
Principal amount or par value   10,184 [23]   10,184 [23]   £ 10,538 [19],[20],[24],[80]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,032                  
Fair Value, Ending Balance 12,734 [19],[20],[80] 10,032 12,734 [19],[20],[80] 10,032                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2 and Tennessee Bidco Limited, First lien 5                        
Principal amount or par value 13,941   13,941                  
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                        
Principal amount or par value 10,184 [19],[20],[24]   10,184 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 10,184 [19],[20]   10,184 [19],[20]                  
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                        
Principal amount or par value 6,246 [19],[20],[24]   6,246 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 6,246 [19],[20]   6,246 [19],[20]                  
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                        
Principal amount or par value | €             € 708 [19],[20],[24],[80]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 757 [19],[20],[80]   757 [19],[20],[80]                  
Investment, Identifier [Axis]: The Kleinfelder Group, Inc., First lien                        
Principal amount or par value 16,533 [19],[24],[26] 16,708 [16],[23],[33] 16,533 [19],[24],[26] 16,708 [16],[23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     16,708 [16],[33]                  
Fair Value, Ending Balance 16,241 [19],[26] 16,708 [16],[33] 16,241 [19],[26] 16,708 [16],[33]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                        
Principal amount or par value 29,868 [19],[24],[28]   29,868 [19],[24],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 29,151 [19],[28]   29,151 [19],[28]                  
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                        
Principal amount or par value 277 [19],[24],[25],[29]   277 [19],[24],[25],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 270 [19],[25],[29]   270 [19],[25],[29]                  
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                        
Principal amount or par value 955 [24]   955 [24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (23)   (23)                  
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                        
Principal amount or par value 4,267 [19],[20],[24],[25]   4,267 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (102) [19],[20],[25]   (102) [19],[20],[25]                  
Investment, Identifier [Axis]: Transcendia Holdings, Inc., Second lien                        
Principal amount or par value 14,500 [19],[24],[28] 14,500 [16],[22],[23] 14,500 [19],[24],[28] 14,500 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,445 [16],[22]                  
Fair Value, Ending Balance 12,418 [19],[28] 13,445 [16],[22] 12,418 [19],[28] 13,445 [16],[22]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien                        
Principal amount or par value 15,382 [19],[24],[29] 15,382 [16],[23],[30] 15,382 [19],[24],[29] 15,382 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     15,228 [16],[30]                  
Fair Value, Ending Balance 15,257 [19],[29] 15,228 [16],[30] 15,257 [19],[29] 15,228 [16],[30]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                        
Principal amount or par value 2,889 [16],[19],[24],[29] 1,201 [16],[17],[23],[27] 2,889 [16],[19],[24],[29] 1,201 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,189 [16],[17],[27]                  
Fair Value, Ending Balance 2,865 [16],[19],[29] 1,189 [16],[17],[27] 2,865 [16],[19],[29] 1,189 [16],[17],[27]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                        
Principal amount or par value 1,501 [19],[20],[24],[25] 300 [16],[17],[23],[27] 1,501 [19],[20],[24],[25] 300 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (3) [16],[17],[27]                  
Fair Value, Ending Balance (12) [19],[20],[25] (3) [16],[17],[27] (12) [19],[20],[25] (3) [16],[17],[27]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                        
Principal amount or par value 2,364 [19],[24],[25],[29] 5,252 [16],[17],[23],[27] 2,364 [19],[24],[25],[29] 5,252 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (53) [16],[17],[27]                  
Fair Value, Ending Balance (19) [19],[25],[29] (53) [16],[17],[27] (19) [19],[25],[29] (53) [16],[17],[27]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Drawn                        
Principal amount or par value   15 [17],[23],[27]   15 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     15 [17],[27]                  
Fair Value, Ending Balance   15 [17],[27]   15 [17],[27]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                        
Principal amount or par value 893 [19],[20],[24],[25] 878 [17],[23],[27] 893 [19],[20],[24],[25] 878 [17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     (9) [17],[27]                  
Fair Value, Ending Balance (29) [19],[20],[25] (9) [17],[27] (29) [19],[20],[25] (9) [17],[27]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                        
Principal amount or par value 11,311 [19],[24],[29] 11,426 [23],[30] 11,311 [19],[24],[29] 11,426 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     11,311 [30]                  
Fair Value, Ending Balance 10,945 [19],[29] 11,311 [30] 10,945 [19],[29] 11,311 [30]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                        
Principal amount or par value 1,473 [19],[20],[24] 1,488 [17],[23] 1,473 [19],[20],[24] 1,488 [17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,473 [17]                  
Fair Value, Ending Balance 1,425 [19],[20] 1,473 [17] $ 1,425 [19],[20] 1,473 [17]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 3                        
Preferred equity dividend rate     19.00%                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 1                        
Principal amount or par value 22,367 [19],[24],[29] 12,643 [16],[23],[30] $ 22,367 [19],[24],[29] 12,643 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     12,643 [16],[30]                  
Fair Value, Ending Balance 22,367 [19],[29] 12,643 [16],[30] 22,367 [19],[29] 12,643 [16],[30]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 2                        
Principal amount or par value 3,949 [19],[24],[29] 9,363 [16],[17],[23] 3,949 [19],[24],[29] 9,363 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,363 [16],[17]                  
Fair Value, Ending Balance 3,949 [19],[29] 9,363 [16],[17] 3,949 [19],[29] 9,363 [16],[17]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 3                        
Principal amount or par value   2,528 [16],[23],[30]   2,528 [16],[23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,528 [16],[30]                  
Fair Value, Ending Balance   2,528 [16],[30]   2,528 [16],[30]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 4                        
Principal amount or par value   1,354 [16],[17],[23]   1,354 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     1,354 [16],[17]                  
Fair Value, Ending Balance   1,354 [16],[17]   1,354 [16],[17]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Junior preferred shares, Non-accrual status                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 0   0                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[30]                  
Fair Value, Ending Balance 0 [19],[29] 0 [16],[30] 0 [19],[29] 0 [16],[30]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17]                  
Fair Value, Ending Balance 0 [19],[20] 0 [16],[17] 0 [19],[20] 0 [16],[17]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     11,085 [16],[17],[81]                  
Fair Value, Ending Balance 11,626 [19],[20],[82] 11,085 [16],[17],[81] $ 11,626 [19],[20],[82] $ 11,085 [16],[17],[81]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1 and UniTek Global Services, Inc., Preferred shares 2                        
Preferred equity dividend rate     20.00% 20.00%                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 7,215 [16],[17],[81]                  
Fair Value, Ending Balance 7,670 [19],[20],[82] 7,215 [16],[17],[81] 7,670 [19],[20],[82] $ 7,215 [16],[17],[81]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 3                        
Preferred equity dividend rate       19.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     396 [16],[17],[68],[83]                  
Fair Value, Ending Balance 6,491 [19],[20],[48],[84] 396 [16],[17],[68],[83] 6,491 [19],[20],[48],[84] $ 396 [16],[17],[68],[83]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[30],[68],[85]                  
Fair Value, Ending Balance 0 [19],[29],[48],[86] 0 [16],[30],[68],[85] $ 0 [19],[29],[48],[86] $ 0 [16],[30],[68],[85]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4 and UniTek Global Services, Inc., Preferred shares 5                        
Preferred equity dividend rate     13.50% 13.50%                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 5                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     $ 0 [16],[17],[68],[85]                  
Fair Value, Ending Balance 0 [19],[20],[48],[86] 0 [16],[17],[68],[85] 0 [19],[20],[48],[86] $ 0 [16],[17],[68],[85]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien                        
Principal amount or par value   9,970 [16],[17],[23]   9,970 [16],[17],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,970 [16],[17]                  
Fair Value, Ending Balance   9,970 [16],[17]   9,970 [16],[17]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                        
Principal amount or par value 11,575 [19],[20],[24]   11,575 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 10,384 [19],[20]   10,384 [19],[20]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                        
Principal amount or par value 5,131 [19],[20],[24]   5,131 [19],[20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 4,603 [19],[20]   4,603 [19],[20]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Senior preferred shares, Non-accrual status                        
Principal amount or par value                   $ 19,795    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 6,491   6,491                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Warrants                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     13,081 [16],[17]                  
Fair Value, Ending Balance 36,680 [19],[20] 13,081 [16],[17] 36,680 [19],[20] 13,081 [16],[17]                
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 1                        
Principal amount or par value 16,183 [19],[24],[29] 16,183 [23],[30] 16,183 [19],[24],[29] 16,183 [23],[30]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     16,224 [30]                  
Fair Value, Ending Balance 15,711 [19],[29] 16,224 [30] 15,711 [19],[29] 16,224 [30]                
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 2                        
Principal amount or par value 10,000 [19],[24],[26] 10,000 [23],[33] 10,000 [19],[24],[26] 10,000 [23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,025 [33]                  
Fair Value, Ending Balance 9,708 [19],[26] 10,025 [33] 9,708 [19],[26] 10,025 [33]                
Investment, Identifier [Axis]: Vectra Co., Second lien                        
Principal amount or par value 10,788 [19],[24],[28] 10,788 [22],[23] 10,788 [19],[24],[28] 10,788 [22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     10,586 [22]                  
Fair Value, Ending Balance 7,004 [19],[28] 10,586 [22] 7,004 [19],[28] 10,586 [22]                
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                        
Principal amount or par value 5,000 [20],[24]   5,000 [20],[24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,817 [20]   3,817 [20]                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn                        
Principal amount or par value 7,478 [19],[20],[24],[25]   7,478 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 7,430 [19],[20],[25]   7,430 [19],[20],[25]                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn 1                        
Principal amount or par value   9,390 [16],[17],[23],[27]   9,390 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     9,390 [16],[17],[27]                  
Fair Value, Ending Balance   9,390 [16],[17],[27]   9,390 [16],[17],[27]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn 2                        
Principal amount or par value   425 [16],[17],[23],[27]   425 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     425 [16],[17],[27]                  
Fair Value, Ending Balance   425 [16],[17],[27]   425 [16],[17],[27]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,040 [19],[20],[24],[25] 678 [16],[17],[23],[27] 2,040 [19],[20],[24],[25] 678 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance (13) [19],[20],[25] 0 [16],[17],[27] (13) [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                        
Principal amount or par value 8,327 [19],[20],[24],[25] 8,257 [16],[17],[23],[27] 8,327 [19],[20],[24],[25] 8,257 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance (53) [19],[20],[25] 0 [16],[17],[27] (53) [19],[20],[25] 0 [16],[17],[27]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                        
Principal amount or par value 18,949 [19],[24],[29]   18,949 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 18,827 [19],[29]   18,827 [19],[29]                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                        
Principal amount or par value 1,254 [19],[24],[29]   1,254 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 1,246 [19],[29]   1,246 [19],[29]                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                        
Principal amount or par value 841 [19],[24],[29]   841 [19],[24],[29]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 835 [19],[29]   835 [19],[29]                  
Investment, Identifier [Axis]: Xactly Corporation, First lien                        
Principal amount or par value 19,047 [19],[24],[26] 19,047 [16],[23],[33] 19,047 [19],[24],[26] 19,047 [16],[23],[33]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     19,047 [16],[33]                  
Fair Value, Ending Balance 19,047 [19],[26] 19,047 [16],[33] 19,047 [19],[26] 19,047 [16],[33]                
Investment, Identifier [Axis]: Xactly Corporation, First lien - Drawn                        
Principal amount or par value 992 [19],[20],[24],[25]   992 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 992 [19],[20],[25]   992 [19],[20],[25]                  
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                        
Principal amount or par value   992 [16],[17],[23],[27]   992 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn                        
Principal amount or par value 495 [19],[20],[24],[25]   495 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 482 [19],[20],[25]   482 [19],[20],[25]                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn                        
Principal amount or par value 1,584 [24]   1,584 [24]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (41)   (41)                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value   2,078 [16],[23],[27],[42]   2,078 [16],[23],[27],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[27],[42]                  
Fair Value, Ending Balance   0 [16],[27],[42]   0 [16],[27],[42]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value   3,968 [16],[17],[23],[27]   3,968 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     0 [16],[17],[27]                  
Fair Value, Ending Balance   0 [16],[17],[27]   0 [16],[17],[27]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 1                        
Principal amount or par value 17,861 [19],[24],[41] 18,045 [16],[23],[42] 17,861 [19],[24],[41] 18,045 [16],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     18,045 [16],[42]                  
Fair Value, Ending Balance 17,393 [19],[41] 18,045 [16],[42] 17,393 [19],[41] 18,045 [16],[42]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 2                        
Principal amount or par value 2,326 [19],[24],[41] 2,350 [16],[23],[42] 2,326 [19],[24],[41] 2,350 [16],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,350 [16],[42]                  
Fair Value, Ending Balance 2,265 [19],[41] 2,350 [16],[42] 2,265 [19],[41] 2,350 [16],[42]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien) - Undrawn                        
Principal amount or par value 3,968 [19],[20],[24],[25]   3,968 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (104) [19],[20],[25]   (104) [19],[20],[25]                  
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Drawn                        
Principal amount or par value   2,915 [16],[17],[23],[27]   2,915 [16],[17],[23],[27]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     2,915 [16],[17],[27]                  
Fair Value, Ending Balance   2,915 [16],[17],[27]   2,915 [16],[17],[27]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                        
Principal amount or par value 11,763 [19],[24],[25],[28]   11,763 [19],[24],[25],[28]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 0 [19],[25],[28]   0 [19],[25],[28]                  
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                        
Principal amount or par value 4,218 [19],[20],[24],[25]   4,218 [19],[20],[24],[25]                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance (37) [19],[20],[25]   (37) [19],[20],[25]                  
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                        
Principal amount or par value 44,287 [19],[24],[28] 41,636 [16],[22],[23] 44,287 [19],[24],[28] 41,636 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     41,636 [16],[22]                  
Fair Value, Ending Balance 43,901 [19],[28] 41,636 [16],[22] 43,901 [19],[28] 41,636 [16],[22]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                        
Principal amount or par value 7,366 [19],[24],[29] 8,667 [16],[22],[23] 7,366 [19],[24],[29] 8,667 [16],[22],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance     8,666 [16],[22]                  
Fair Value, Ending Balance $ 7,311 [19],[29] $ 8,666 [16],[22] $ 7,311 [19],[29] $ 8,666 [16],[22]                
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[3] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of December 31, 2021 and December 31, 2020 along with transactions during the year ended December 31, 2021 in which the issuer was a non-controlled/affiliated investment is as follows:
Portfolio CompanyFair Value at December 31, 2020Gross
Additions (A)		Gross
Redemptions
(B)		Net
Realized
Gains
(Losses)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2021Interest
Income		Dividend
Income		Other
Income
Permian Holdco 1, Inc. / Permian Holdco 2, Inc. / Permian Holdco 3, Inc. / Permian Trust$— $225 $(12,438)$(12,213)$12,213 $— $— $— $— 
Sierra Hamilton Holdings Corporation4,776 11 (828)2 41 4,000 188 — 24 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC98,236 5,575 (27,287)20,549 54,251 130,775 1,825 5,123 321 
Total Non-Controlled/Affiliated Investments$103,012 $5,811 $(40,553)$8,338 $66,505 $134,775 $2,013 $5,123 $345 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement at fair value of an existing portfolio company into this category from a different category.
(B)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[4] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement at fair value of an existing portfolio company into this category from a different category.
[5] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement at fair value of an existing portfolio company into this category from a different category.
[6] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[7] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[8] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of December 31, 2022 and December 31, 2021 along with transactions during the year ended December 31, 2022 in which the issuer was a non-controlled/affiliated investment is as follows:
Portfolio CompanyFair Value at December 31, 2021Gross
Additions (A)		Gross
Redemptions
(B)		Net Change In Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Permian Holdco 3, Inc. / Permian Trust$— $— $— $— $— $— $— $— $— 
Sierra Hamilton Holdings Corporation4,000 — — — 4,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC130,775 5,168 — (9,156)126,787 — 2,105 4,109 250 
Total Non-Controlled/Affiliated Investments$134,775 $5,168 $— $(9,156)$130,787 $— $2,105 $4,109 $250 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement at fair value of an existing portfolio company into this category from a different category.
(B)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[9] Denotes investments in which the Company is in “Control”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of December 31, 2021 and December 31, 2020 along with transactions during the year ended December 31, 2021 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2020Gross
Additions
(A)		Gross
Redemptions
(B)		Net 
Realized
Gains
(Losses)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2021Interest
Income		Dividend
Income		Other
Income
Edmentum Inc.$— $— $— $2,207 $— $— $— $— $1,200 
National HME, Inc./NHME Holdings Corp.27,530 8,094 — — (8,277)27,347 4,594 — 500 
New Benevis Topco, LLC / New Benevis Holdco, Inc.98,442 5,417 — — 5,736 109,595 6,956 — 1,500 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.29,336 5,423 — — — 34,759 3,522 — 634 
NM APP CANADA CORP12,302 — — — (2,880)9,422 — 978 — 
NM APP US LLC7,410 — — — 7,481 14,891 — 561 — 
NM CLFX LP14,885 — — — 9,791 24,676 — 1,521 — 
NM DRVT LLC7,084 — — — 900 7,984 — 466 — 
NM JRA LLC3,830 — — — 166 3,996 — 268 — 
NM GLCR LP29,130 — — — 21,557 50,687 — 1,892 — 
NM KRLN LLC1,501 641 — — (1,898)244 — — — 
NM NL Holdings, L.P.67,132 32,757 — — 7,981 107,870 — 7,414 — 
NM GP Holdco, LLC703 415 — — 79 1,197 — 52 — 
NM YI LLC6,852 — — — 1,434 8,286 — 877 — 
NMFC Senior Loan Program I LLC23,000 10,000 (33,000)— — — — 741 — 
NMFC Senior Loan Program II LLC79,400 — (79,400)— — — — 2,410 — 
NMFC Senior Loan Program III LLC120,000 20,000 — — — 140,000 — 16,712 — 
NMFC Senior Loan Program IV LLC— 112,400 — — — 112,400 — 7,767 — 
Tenawa Resource Management LLC / Tenawa Resource Holdings LLC / QID TRH Holdings LLC (C)— 64,776 (45,892)(11,243)15,937 34,821 845 — 8 
UniTek Global Services, Inc.72,338 6,669 (2,712)1 (8,660)67,635 3,880 4,497 738 
Total Controlled Investments$600,875 $266,592 $(161,004)$(9,035)$49,347 $755,810 $19,797 $46,156 $4,580 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
(C)Portfolio company moved into the controlled category from the non-controlled/non-affiliated investment category.
[10] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[11] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[12] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[13] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[14] Denotes investments in which the Company is in “Control”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of December 31, 2022 and December 31, 2021 along with transactions during the year ended December 31, 2022 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2021Gross
Additions
(A)		Gross
Redemptions
(B)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2022Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Edmentum Inc.$— $— $— $— $— $54 $— $— $— 
National HME, Inc./NHME Holdings Corp.27,347 (8,161)— (13,805)5,381 — (9,661)— (1,500)
New Benevis Topco, LLC / New Benevis Holdco, Inc.109,595 5,914 — (1,363)114,146 — 8,057 — 1,500 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.34,759 7,805 — 15,000 57,564 — 4,504 — 511 
NM APP CANADA CORP9,422 — (7,345)(2,077)— 4,212 — 620 713 
NM APP US LLC14,891 — (5,080)(9,811)— 4,489 — 255 483 
NM CLFX LP24,676 — — (8,504)16,172 — — 1,596 — 
NM DRVT LLC7,984 — (5,152)(2,832)— 3,439 — 173 475 
NM JRA LLC3,996 — (2,043)(1,953)— 2,049 — 72 188 
NM GLCR LP50,687 — (14,750)(35,937)— 35,713 — 400 2,150 
NM KRLN LLC244 97 (9,319)8,978 — (9,318)— — — 
NM NL Holdings, L.P.107,870 53 (10,885)(2,733)94,305 — — 8,453 — 
NM GP Holdco, LLC1,197 1 (138)(32)1,028 — — 94 — 
NM YI LLC8,286 — — 1,195 9,481 — — 828 — 
NMFC Senior Loan Program III LLC140,000 — — — 140,000 — — 17,485 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 13,173 — 
Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC 34,821 3,865 (38,685)35,787 35,788 12,802 6,316 — 1,902 
UniTek Global Services, Inc.67,635 13,378 (1,549)24,306 103,770 — 4,738 4,363 724 
Total Controlled Investments$755,810 $22,952 $(94,946)$6,219 $690,035 $53,440 $13,954 $47,512 $7,146 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[15] Portfolio company moved into the controlled category from the non-controlled/non-affiliated investment category.
[16] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[17] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[18] The Company holds ordinary shares in AAC Lender Holdings, LLC and a first lien term loan, first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[19] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[20] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[21] The Company holds ordinary shares in AAC Lender Holdings, LLC and a first lien term loan, first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[22] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[23] Par amount is denominated in United States Dollar unless otherwise noted, British Pound ("£").
[24] Par amount is denominated in United States Dollar unless otherwise noted, British Pound ("£") and/or Euro ("€").
[25] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[26] Investment is held in New Mountain Finance SBIC, L.P.
[27] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[28] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[29] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[30] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower and Wells Fargo Bank, National Association as the Administrative Agent and Collateral Custodian. See Note 7. Borrowings, for details.
[31] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, a first lien delayed draw and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum
[32] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, a first lien delayed draw and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum.
[33] Investment is held in New Mountain Finance SBIC, L.P.
[34] Investment is held in NMF Ancora Holdings, Inc.
[35] The Company holds investments in two wholly-owned subsidiaries of Appriss Health Holdings, Inc. The Company holds a first lien term loan and a first lien revolver in Appriss Health, LLC, and preferred equity in Appriss Health Intermediate Holdings, Inc. The preferred equity is entitled to receive preferential dividends at a rate of 11.00% per annum.
[36] The Company holds investments in two wholly-owned subsidiaries of Appriss Health Holdings, Inc. The company holds a first lien term loan and a first lien revolver in Appriss Health, LLC, and preferred equity in Appriss Health Intermediate Holdings, Inc. The preferred equity is entitled to receive preferential dividends at a rate of 11.00% per annum.
[37] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2021, 18.0% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[38] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2022, 15.3% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[39] The Company holds preferred equity in Bach Special Limited (Bach Preference Limited) that is entitled to receive cumulative preferential dividends at a rate of 12.25% per annum payable in additional shares.
[40] The Company holds preferred equity in Bach Special Limited (Bach Preference Limited) that is entitled to receive cumulative preferential dividends at a rate of 12.25% per annum payable in additional shares.
[41] Investment is held in New Mountain Finance SBIC II, L.P.
[42] Investment is held in New Mountain Finance SBIC II, L.P.
[43] The Company holds preferred equity in Dealer Tire Holdings, LLC that is entitled to receive cumulative preferential dividends at a rate of 7.00% per annum.
[44] The Company holds preferred equity in Dealer Tire Holdings, LLC that is entitled to receive cumulative preferential dividends at a rate of 7.00% per annum.
[45] The Company holds investments in two wholly-owned subsidiary of Diamond Parent Holdings Corp. The Company holds three first lien term loans and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The preferred equity in Diligent Preferred Issuer Inc. is entitled to receive cumulative preferential dividends at a rate 10.50% per annum.
[46] The Company holds investments in two wholly-owned subsidiary of Diamond Parent Holdings Corp. The Company holds three first lien term loans and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The preferred equity in Diligent Preferred Issuer Inc. is entitled to receive cumulative preferential dividends at a rate 10.50% per annum.
[47] The Company holds ordinary shares in TVG-Edmentum Holdings, LLC, and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC. The ordinary shares are entitled to receive cumulative preferential dividends at a rate of 12.0% per annum.
[48] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[49] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and two first lien delayed draws in FS WhiteWater Borrwer, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[50] Investment is held in NMF HB, Inc
[51] The Company holds preferred equity in HB Wealth Management, LLC that is entitled to receive cumulative preferential dividends at a rate of 4.00% per annum.
[52] Investment is held in NMF HB, Inc.
[53] The Company holds preferred equity in HB Wealth Management, LLC that is entitled to receive cumulative preferential dividends at a rate of 4.00% per annum.
[54] Investment is held in NMF TRM, LLC.
[55] Investment is held in NMF QID NGL Holdings, Inc.
[56] The Company holds preferred equity in Knockout Intermediate Holdings I Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Kaseya, Inc., a wholly-owned subsidiary of Knockout Intermediate Holdings I Inc. The preferred equity is entitled to received cumulative preferential dividends at a rate of 11.75% per annum.
[57] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as second lien term loans in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp.
[58] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a Tranche A Term Loan and Tranche B Term Loan in National HME, Inc., a whollyowned subsidiary of NHME Holdings Corp.
[59] Investment is held in New Mountain Net Lease Corporation.
[60] Investment is held in New Mountain Net Lease Corporation.
[61] The Company holds ordinary shares in OA Topco, L.P., and a first lien term loan and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidary of OA Topco, L.P.
[62] The Company holds ordinary shares in OA Topco, L.P., and a first lien term loan and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[63] Investment is held in NMF OEC, Inc.
[64] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC. The preferred equity is entitled to receive prefenential dividends of 11.00% per annum.
[65] Investment is held in NMF OEC, Inc.
[66] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC. The preferred equity is entitled to receive prefenential dividends of 11.00% per annum.
[67] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,539 as of December 31, 2022. See Note 2. Summary of Significant Accounting Policies, for details.
[68] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[69] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $21,422 as of December 31, 2021. See Note 2. Summary of Significant Accounting Policies, for details.
[70] Investment is held in NMF Permian Holdings, LLC.
[71] Investment is held in NMF Permian Holdings, LLC
[72] The Company holds ordinary shares in Pioneer Topco I, L.P., and a first lien term loan and a first lien revolver in Pioneer Buyer I, LLC, a wholly-owned subsidiary of Pioneer Topco I, L.P.
[73] The Company holds ordinary shares in Pioneer Topco I, L.P., and a first lien term loan and a first lien revolver in Pioneer Buyer I, LLC, a wholly-owned subsidiary of Pioneer Topco I, L.P.
[74] Investment is held in NMF Pioneer, Inc.
[75] The Company holds preferred equity in Project Essential Super Parent, LLC that is entitled to receive cumulative preferential dividends at a rate of L + 9.50% per annum.
[76] The Company holds preferred equity in Project Essential Super Parent, LLC that is entitled to receive cumulative preferential dividends at a rate of L + 9.50% per annum.
[77] Investment is held in NMF TRM, LLC.
[78] Investment is held in NMF QID NGL Holdings, Inc.
[79] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2021, the par value U.S. dollar equivalent of the first lien term loan, drawn first lien term loan and the undrawn first lien term loan is $17,428, $5,103 and $12,884, respectively. See Note 2. Summary of Significant Accounting Policies, for details
[80] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2022, the par value U.S. dollar equivalent of the first lien term loan, and drawn first lien term loan is $15,562 and $13,941, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[81] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to received cumulative preferential dividends at a rate of 20.0% per annum payable in additional shares.
[82] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to received cumulative preferential dividends at a rate of 20.0% per annum payable in additional shares.
[83] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to receive cumulative preferential dividends at a rate of 19.0% per annum payable in additional shares.
[84] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to receive cumulative preferential dividends at a rate of 19.0% per annum payable in additional shares.
[85] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to receive cumulative preferential dividends at a rate of 13.5% per annum payable in additional shares.
[86] The Company holds preferred equity in UniTek Global Services, Inc. that is entitled to receive cumulative preferential dividends at a rate of 13.5% per annum payable in additional shares.