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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
investment
agreement
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
investment
agreement
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
investment
agreement
Sep. 30, 2022
GBP (£)
investment
agreement
Sep. 30, 2022
EUR (€)
investment
agreement
Jun. 30, 2022
USD ($)
Dec. 31, 2021
GBP (£)
investment
agreement
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | agreement 1     1   1 1 1   1    
Cost basis of securities purchased under collateralized agreements to resell $ 30,000     $ 30,000   $ 30,000            
Fair value of securities purchased under collateralized agreements to resell 19,401     19,401   21,422            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [1]       3,174,364                
Net Change In Unrealized Appreciation (Depreciation) (24,937) $ (30,749)   (68,259) $ 52,531              
Fair Value, Ending Balance 3,234,433 [2]     3,234,433 [2]   $ 3,174,364 [1]            
Net Realized Gains (Losses) $ (388) 23,008   $ 35,687 12,692              
Investments at fair value that are non-qualifying assets as a percentage of total assets 16.20%     16.20%   18.00% 16.20% 16.20%   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 $ 3,938 3,675   $ 12,935 12,687              
NMFC Senior Loan Program IV LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Dividend Income 3,161 2,670 $ 5,098 9,520                
Non-controlled/Affiliated                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance       134,775 [3] 103,012 $ 103,012            
Gross Additions       3,823 [4]   5,811 [5]            
Gross Redemptions       0 [6]   (40,553) [7]            
Net Change In Unrealized Appreciation (Depreciation)       377   66,505            
Fair Value, Ending Balance 138,975     138,975   134,775 [3]            
Net Realized Gains (Losses)       0   8,338            
Interest Income       1,561   2,013            
Dividend Income       3,036   5,123            
Other Income 62 79   187 284 345            
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 [4]       0                
Gross Redemptions [6]       0                
Net Change In Unrealized Appreciation (Depreciation)       0                
Fair Value, Ending Balance 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 0            
Gross Additions [5]           225            
Gross Redemptions [7]           (12,438)            
Net Change In Unrealized Appreciation (Depreciation)           12,213            
Fair Value, Ending Balance           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 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            
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 98,236            
Gross Additions       3,823 [4]   5,575 [5]            
Gross Redemptions       0 [6]   (27,287) [7]            
Net Change In Unrealized Appreciation (Depreciation)       377   54,251            
Fair Value, Ending Balance 134,975     134,975   130,775            
Net Realized Gains (Losses)       0   20,549            
Interest Income       1,561   1,825            
Dividend Income       3,036   5,123            
Other Income       187   321            
Controlled                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance       755,810 [8] 600,875 600,875            
Gross Additions       29,405 [9]   266,592 [10]            
Gross Redemptions       (54,507) [11]   (161,004) [12]            
Net Change In Unrealized Appreciation (Depreciation)       (11,036)   49,347            
Fair Value, Ending Balance 719,672 [13]     719,672 [13]   755,810 [8]            
Net Realized Gains (Losses)       36,371   (9,035)            
Interest Income       18,581   19,797            
Dividend Income       35,374   46,156            
Other Income 2,221 812   7,235 3,759 4,580            
Controlled | Edmentum Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance       0 0 0            
Gross Additions [10]           0            
Gross Redemptions [12]           0            
Net Change In Unrealized Appreciation (Depreciation)           0            
Fair Value, Ending Balance           0            
Net Realized Gains (Losses)           2,207            
Interest Income           0            
Dividend Income           0            
Other Income           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 27,530            
Gross Additions       3,075 [9]   8,094 [10]            
Gross Redemptions       0 [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (23,401)   (8,277)            
Fair Value, Ending Balance 7,021     7,021   27,347            
Net Realized Gains (Losses)       0   0            
Interest Income       1,575   4,594            
Dividend Income       0   0            
Other Income       0   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 98,442            
Gross Additions       4,377 [9]   5,417 [10]            
Gross Redemptions       0 [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (1,173)   5,736            
Fair Value, Ending Balance 112,799     112,799   109,595            
Net Realized Gains (Losses)       0   0            
Interest Income       5,753   6,956            
Dividend Income       0   0            
Other Income       1,125   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 29,336            
Gross Additions       6,560 [9]   5,423 [10]            
Gross Redemptions       0 [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       5,000   0            
Fair Value, Ending Balance 46,319     46,319   34,759            
Net Realized Gains (Losses)       0   0            
Interest Income       3,215   3,522            
Dividend Income       0   0            
Other Income       389   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 12,302            
Gross Additions       0 [9]   0 [10]            
Gross Redemptions       0 [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       2,198   (2,880)            
Fair Value, Ending Balance 11,620     11,620   9,422            
Net Realized Gains (Losses)       0   0            
Interest Income       0   0            
Dividend Income       635   978            
Other Income       500   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 7,410            
Gross Additions       0 [9]   0 [10]            
Gross Redemptions       (5,080) [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (9,811)   7,481            
Fair Value, Ending Balance 0     0   14,891            
Net Realized Gains (Losses)       4,488   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 14,885            
Gross Additions       0 [9]   0 [10]            
Gross Redemptions       0 [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (7,154)   9,791            
Fair Value, Ending Balance 17,522     17,522   24,676            
Net Realized Gains (Losses)       0   0            
Interest Income       0   0            
Dividend Income       1,169   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 7,084            
Gross Additions       0 [9]   0 [10]            
Gross Redemptions       (5,152) [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (2,832)   900            
Fair Value, Ending Balance 0     0   7,984            
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 3,830            
Gross Additions       0 [9]   0 [10]            
Gross Redemptions       (2,043) [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (1,953)   166            
Fair Value, Ending Balance 0     0   3,996            
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 29,130            
Gross Additions       0 [9]   0 [10]            
Gross Redemptions       (14,750) [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (35,937)   21,557            
Fair Value, Ending Balance 0     0   50,687            
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 1,501            
Gross Additions       97 [9]   641 [10]            
Gross Redemptions       (9,318) [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       8,977   (1,898)            
Fair Value, Ending Balance 0     0   244            
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 67,132            
Gross Additions       52 [9]   32,757 [10]            
Gross Redemptions       (10,886) [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (1,680)   7,981            
Fair Value, Ending Balance 95,356     95,356   107,870            
Net Realized Gains (Losses)       0   0            
Interest Income       0   0            
Dividend Income       6,330   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       1,197 703 703            
Gross Additions       0 [9]   415 [10]            
Gross Redemptions       (137) [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       (22)   79            
Fair Value, Ending Balance 1,038     1,038   1,197            
Net Realized Gains (Losses)       0   0            
Interest Income       0   0            
Dividend Income       73   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 6,852            
Gross Additions       0 [9]   0 [10]            
Gross Redemptions       0 [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       1,089   1,434            
Fair Value, Ending Balance 9,375     9,375   8,286            
Net Realized Gains (Losses)       0   0            
Interest Income       0   0            
Dividend Income       621   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 23,000            
Gross Additions [10]           10,000            
Gross Redemptions [12]           (33,000)            
Net Change In Unrealized Appreciation (Depreciation)           0            
Fair Value, Ending Balance           0            
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 79,400            
Gross Additions [10]           0            
Gross Redemptions [12]           (79,400)            
Net Change In Unrealized Appreciation (Depreciation)           0            
Fair Value, Ending Balance           0            
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       140,000 120,000 120,000            
Gross Additions       0 [9]   20,000 [10]            
Gross Redemptions       0 [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       0   0            
Fair Value, Ending Balance 140,000     140,000   140,000            
Net Realized Gains (Losses)       0   0            
Interest Income       0   0            
Dividend Income       12,935   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 0            
Gross Additions       0 [9]   112,400 [10]            
Gross Redemptions       0 [11]   0 [12]            
Net Change In Unrealized Appreciation (Depreciation)       0   0            
Fair Value, Ending Balance 112,400     112,400   112,400            
Net Realized Gains (Losses)       0   0            
Interest Income       0   0            
Dividend Income       9,520   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 [9]       3,866                
Gross Redemptions [11]       (5,628)                
Net Change In Unrealized Appreciation (Depreciation)       40,010                
Fair Value, Ending Balance 73,069     73,069   34,821            
Net Realized Gains (Losses)       0                
Interest Income       4,717                
Dividend Income       0                
Other Income       1,381                
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 [14]       34,821 0 0            
Gross Additions [10],[14]           64,776            
Gross Redemptions [12],[14]           (45,892)            
Net Change In Unrealized Appreciation (Depreciation) [14]           15,937            
Fair Value, Ending Balance [14]           34,821            
Net Realized Gains (Losses) [14]           (11,243)            
Interest Income [14]           845            
Dividend Income [14]           0            
Other Income [14]           8            
Controlled | UniTek Global Services, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance       67,635 72,338 72,338            
Gross Additions       11,378 [9]   6,669 [10]            
Gross Redemptions       (1,513) [11]   (2,712) [12]            
Net Change In Unrealized Appreciation (Depreciation)       15,653   (8,660)            
Fair Value, Ending Balance 93,153     93,153   67,635            
Net Realized Gains (Losses)       0   1            
Interest Income       3,321   3,880            
Dividend Income       3,191   4,497            
Other Income       544   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 [15],[16],[17]       0                
Fair Value, Ending Balance 0 [18],[19],[20]     0 [18],[19],[20]   0 [15],[16],[17]            
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien - Drawn 1                        
Principal amount or par value [18],[19],[21],[22] 8,510     8,510                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 8,425     8,425                
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien - Drawn 2                        
Principal amount or par value [18],[21],[22],[23] 2,761     2,761                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[23] 2,733     2,733                
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien 1                        
Principal amount or par value [18],[21],[24] 20,687     20,687                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 20,479     20,479                
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien 2                        
Principal amount or par value [18],[21],[23] 9,822     9,822                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[23] 9,724     9,724                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien                        
Principal amount or par value [25],[26]           20,843            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [25]       20,634                
Fair Value, Ending Balance [25]           20,634            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 1                        
Principal amount or par value 3,659 [18],[19],[21],[22]     3,659 [18],[19],[21],[22]   3,659 [16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       (37)                
Fair Value, Ending Balance (37) [18],[19],[22]     (37) [18],[19],[22]   (37) [16],[27]            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 2                        
Principal amount or par value 5,486 [18],[21],[22],[23]     5,486 [18],[21],[22],[23]   25,420 [16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       (254)                
Fair Value, Ending Balance (55) [18],[22],[23]     (55) [18],[22],[23]   (254) [16],[27]            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 3                        
Principal amount or par value [18],[19],[21],[22] 16,910     16,910                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (169)     (169)                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated                        
Principal amount or par value [16],[26]           11,110            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       10,944                
Fair Value, Ending Balance [16]           10,944            
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                        
Principal amount or par value [18],[19],[21] 12,141     12,141                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 11,959     11,959                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                        
Principal amount or par value [18],[21],[23] 4,761     4,761                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[23] 4,690     4,690                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien                        
Principal amount or par value 22,138 [18],[21],[28]     22,138 [18],[21],[28]   22,306 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       22,083                
Fair Value, Ending Balance 21,567 [18],[28]     21,567 [18],[28]   22,083 [15],[29]            
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                        
Principal amount or par value 1,946 [18],[19],[21],[22]     1,946 [18],[19],[21],[22]   59 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       58                
Fair Value, Ending Balance 1,895 [18],[19],[22]     1,895 [18],[19],[22]   58 [15],[16],[27]            
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 2,354 [18],[19],[21],[22]     2,354 [18],[19],[21],[22]   2,354 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (24)                
Fair Value, Ending Balance (61) [18],[19],[22]     (61) [18],[19],[22]   (24) [15],[16],[27]            
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 6,287 [18],[19],[21],[22]     6,287 [18],[19],[21],[22]   8,180 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (82)                
Fair Value, Ending Balance (162) [18],[19],[22]     $ (162) [18],[19],[22]   $ (82) [15],[16],[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 [15],[16],[30]       $ 12,989                
Fair Value, Ending Balance 13,663 [18],[19],[31]     13,663 [18],[19],[31]   $ 12,989 [15],[16],[30]            
Investment, Identifier [Axis]: ADG, LLC, Second lien                        
Principal amount or par value 7,179 [18],[19],[21]     7,179 [18],[19],[21]   6,591 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       6,082                
Fair Value, Ending Balance 6,280 [18],[19]     6,280 [18],[19]   6,082 [15],[16]            
Investment, Identifier [Axis]: Affinity Dental Management, Inc., First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           1,738            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       1,738                
Fair Value, Ending Balance [15],[16],[27]           1,738            
Investment, Identifier [Axis]: Affinity Dental Management, Inc., First lien 1                        
Principal amount or par value [15],[26],[29]           33,281            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       33,281                
Fair Value, Ending Balance [15],[29]           33,281            
Investment, Identifier [Axis]: Affinity Dental Management, Inc., First lien 2                        
Principal amount or par value [15],[26],[32]           10,482            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[32]       10,482                
Fair Value, Ending Balance [15],[32]           10,482            
Investment, Identifier [Axis]: AgKnowledge Holdings Company, Inc., First lien                        
Principal amount or par value [15],[26],[29]           9,166            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       9,166                
Fair Value, Ending Balance [15],[29]           9,166            
Investment, Identifier [Axis]: AgKnowledge Holdings Company, Inc., First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27]           526            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: Alegeus Technologies Holding Corp., First lien                        
Principal amount or par value 13,444 [18],[21],[24]     13,444 [18],[21],[24]   13,443 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       13,443                
Fair Value, Ending Balance 13,444 [18],[24]     13,444 [18],[24]   13,443 [15],[25]            
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 1                        
Principal amount or par value [18],[19],[21],[22] 1,776     1,776                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (31)     (31)                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 2                        
Principal amount or par value [18],[19],[21],[22] 14,376     14,376                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (253)     (253)                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                        
Principal amount or par value 29,986     29,986                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                        
Principal amount or par value 2,652 [18],[19],[20],[21],[22]     2,652 [18],[19],[20],[21],[22]   2,652 [15],[16],[17],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[17],[27]       0                
Fair Value, Ending Balance 0 [18],[19],[20],[22]     0 [18],[19],[20],[22]   0 [15],[16],[17],[27]            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                        
Principal amount or par value 28,459 [18],[21],[28]     28,459 [18],[21],[28]   27,610 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       17,386                
Fair Value, Ending Balance 20,335 [18],[28]     20,335 [18],[28]   17,386 [15],[29]            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                        
Principal amount or par value 1,527 [18],[19],[21]     1,527 [18],[19],[21]   1,527 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       0                
Fair Value, Ending Balance 0 [18],[19]     0 [18],[19]   0 [15],[16]            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                        
Principal amount or par value   12,911 12,911   12,911              
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 8,134     8,134                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                        
Principal amount or par value 5,230 [18],[19],[21]     5,230 [18],[19],[21]   5,230 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       0                
Fair Value, Ending Balance 0 [18],[19]     0 [18],[19]   0 [15],[16]            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated, Non-accrual status                        
Principal amount or par value                     $ 5,230  
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[33]       158                
Fair Value, Ending Balance 158 [18],[34]     158 [18],[34]   158 [15],[33]            
Investment, Identifier [Axis]: Ansira Holdings, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 19,708     19,708                
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 1                        
Principal amount or par value 33,026 [18],[21],[24]     33,026 [18],[21],[24]   31,793 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       24,025                
Fair Value, Ending Balance 15,737 [18],[24]     15,737 [18],[24]   24,025 [15],[25]            
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 2                        
Principal amount or par value 8,334 [18],[19],[21]     8,334 [18],[19],[21]   8,033 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       6,071                
Fair Value, Ending Balance $ 3,971 [18],[19]     $ 3,971 [18],[19]   $ 6,071 [15],[16]            
Investment, Identifier [Axis]: Appriss Health Holdings, Inc, Wholly-owned subsidiaries                        
Number of investments held | investment 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 [15],[16],[35]       $ 2,466                
Fair Value, Ending Balance $ 2,678 [18],[19],[36]     2,678 [18],[19],[36]   $ 2,466 [15],[16],[35]            
Investment, Identifier [Axis]: Appriss Health, LLC, First lien                        
Principal amount or par value 6,242 [18],[21],[24],[36]     6,242 [18],[21],[24],[36]   6,250 [15],[25],[26],[35]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25],[35]       6,187                
Fair Value, Ending Balance 6,242 [18],[24],[36]     6,242 [18],[24],[36]   6,187 [15],[25],[35]            
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                        
Principal amount or par value 417 [18],[19],[21],[22],[36]     417 [18],[19],[21],[22],[36]   417 [15],[16],[26],[27],[35]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27],[35]       (4)                
Fair Value, Ending Balance 0 [18],[19],[22],[36]     0 [18],[19],[22],[36]   (4) [15],[16],[27],[35]            
Investment, Identifier [Axis]: Apptio, Inc., First lien                        
Principal amount or par value [15],[25],[26]           11,203            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       11,203                
Fair Value, Ending Balance [15],[25]           11,203            
Investment, Identifier [Axis]: Apptio, Inc., First lien - Drawn                        
Principal amount or par value 827 [18],[19],[21],[22]     827 [18],[19],[21],[22]   827 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       827                
Fair Value, Ending Balance 827 [18],[19],[22]     827 [18],[19],[22]   827 [15],[16],[27]            
Investment, Identifier [Axis]: Apptio, Inc., First lien - Undrawn                        
Principal amount or par value 1,240 [18],[19],[21],[22]     1,240 [18],[19],[21],[22]   1,240 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: Apptio, Inc., First lien 1                        
Principal amount or par value [18],[21],[24] 5,703     5,703                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 5,703     5,703                
Investment, Identifier [Axis]: Apptio, Inc., First lien 2                        
Principal amount or par value [18],[21],[28] 5,500     5,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 5,500     5,500                
Investment, Identifier [Axis]: Associations, Inc., First lien 3                        
Principal amount or par value [15],[25],[26]           8,590            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       8,547                
Fair Value, Ending Balance [15],[25]           8,547            
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                        
Principal amount or par value 3,543 [18],[19],[21],[22]     3,543 [18],[19],[21],[22]   3,543 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (18)                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   (18) [15],[16],[27]            
Investment, Identifier [Axis]: Associations, Inc., First lien 1                        
Principal amount or par value 35,558 [18],[21],[28]     35,558 [18],[21],[28]   30,196 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       30,045                
Fair Value, Ending Balance 35,558 [18],[28]     35,558 [18],[28]   30,045 [15],[29]            
Investment, Identifier [Axis]: Associations, Inc., First lien 2                        
Principal amount or par value 8,754 [18],[21],[24]     8,754 [18],[21],[24]   8,590 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       8,547                
Fair Value, Ending Balance 8,754 [18],[24]     8,754 [18],[24]   8,547 [15],[16]            
Investment, Identifier [Axis]: Associations, Inc., First lien 3                        
Principal amount or par value [18],[19],[21] 8,754     8,754                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 8,754     8,754                
Investment, Identifier [Axis]: Associations, Inc., First lien 4                        
Principal amount or par value 5,287 [18],[21],[24]     5,287 [18],[21],[24]   5,188 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       5,162                
Fair Value, Ending Balance 5,287 [18],[24]     5,287 [18],[24]   5,162 [15],[25]            
Investment, Identifier [Axis]: Associations, Inc., First lien 5                        
Principal amount or par value 4,206 [18],[21],[24]     4,206 [18],[21],[24]   4,127 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       4,106                
Fair Value, Ending Balance 4,206 [18],[24]     4,206 [18],[24]   4,106 [15],[25]            
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                        
Principal amount or par value 34,459 [18],[21],[24]     34,459 [18],[21],[24]   34,459 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25],[37]       34,459                
Fair Value, Ending Balance 34,459 [18],[24],[38]     34,459 [18],[24],[38]   $ 34,459 [15],[25],[37]            
Investment, Identifier [Axis]: Auctane, Inc., First lien 1                        
Principal amount or par value [18],[21],[24] 22,124     22,124                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 21,748     21,748                
Investment, Identifier [Axis]: Auctane, Inc., First lien 2                        
Principal amount or par value [18],[21],[28] 14,962     14,962                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 14,708     $ 14,708                
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 [15],[16],[37],[39]       $ 9,701                
Fair Value, Ending Balance 10,525 [18],[19],[38],[40]     10,525 [18],[19],[38],[40]   $ 9,701 [15],[16],[37],[39]            
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Drawn                        
Principal amount or par value 1,030 [18],[19],[21],[22]     1,030 [18],[19],[21],[22]   1,485 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       1,485                
Fair Value, Ending Balance 1,000 [18],[19],[22]     1,000 [18],[19],[22]   1,485 [15],[16],[27]            
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27]           30            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: Bluefin Holding, LLC, Second lien                        
Principal amount or par value 18,000 [18],[21],[24]     18,000 [18],[21],[24]   18,000 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       18,000                
Fair Value, Ending Balance 17,505 [18],[24]     17,505 [18],[24]   18,000 [15],[25]            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 1                        
Principal amount or par value 22,500 [18],[21],[41]     22,500 [18],[21],[41]   22,500 [26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [42]       22,613                
Fair Value, Ending Balance 21,798 [18],[41]     21,798 [18],[41]   22,613 [42]            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 2                        
Principal amount or par value 16,624 [18],[21],[28]     16,624 [18],[21],[28]   16,624 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       16,707                
Fair Value, Ending Balance 16,105 [18],[28]     16,105 [18],[28]   16,707 [29]            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 3                        
Principal amount or par value 6,000 [18],[21],[24]     6,000 [18],[21],[24]   6,000 [25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [25]       6,030                
Fair Value, Ending Balance 5,813 [18],[24]     5,813 [18],[24]   6,030 [25]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 392     392                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 392     392                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                        
Principal amount or par value [18],[19],[21],[22] 460     460                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 0     0                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 1                        
Principal amount or par value [15],[16],[26],[27]           2,395            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 2                        
Principal amount or par value [15],[16],[26],[27]           852            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                        
Principal amount or par value 16,702 [18],[21],[28]     16,702 [18],[21],[28]   16,830 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       16,830                
Fair Value, Ending Balance 16,702 [18],[28]     16,702 [18],[28]   16,830 [15],[29]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                        
Principal amount or par value 3,451 [18],[21],[28]     3,451 [18],[21],[28]   1,075 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       1,075                
Fair Value, Ending Balance 3,451 [18],[28]     3,451 [18],[28]   1,075 [15],[29]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                        
Principal amount or par value 773 [18],[21],[28]     773 [18],[21],[28]   779 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       779                
Fair Value, Ending Balance 773 [18],[28]     773 [18],[28]   779 [15],[16]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                        
Principal amount or par value 346 [18],[21],[28]     346 [18],[21],[28]   349 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       349                
Fair Value, Ending Balance 346 [18],[28]     346 [18],[28]   349 [15],[16]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                        
Principal amount or par value 276 [18],[21],[28]     276 [18],[21],[28]   278 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       278                
Fair Value, Ending Balance 276 [18],[28]     276 [18],[28]   278 [15],[16]            
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                        
Principal amount or par value 11,410 [18],[21],[28]     11,410 [18],[21],[28]   11,497 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       11,497                
Fair Value, Ending Balance 10,913 [18],[28]     10,913 [18],[28]   11,497 [15],[29]            
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                        
Principal amount or par value 3,399 [18],[21],[28]     3,399 [18],[21],[28]   3,425 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       3,425                
Fair Value, Ending Balance 3,251 [18],[28]     3,251 [18],[28]   3,425 [15],[16]            
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                        
Principal amount or par value 8,296 [18],[21],[28]     8,296 [18],[21],[28]   8,302 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       8,209                
Fair Value, Ending Balance 7,736 [18],[28]     7,736 [18],[28]   8,209 [15],[29]            
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                        
Principal amount or par value 912 [18],[19],[21],[22]     912 [18],[19],[21],[22]   906 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       896                
Fair Value, Ending Balance 850 [18],[19],[22]     850 [18],[19],[22]   896 [15],[16],[27]            
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27]           226            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (3)                
Fair Value, Ending Balance [15],[16],[27]           (3)            
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 1                        
Principal amount or par value 7,012 [18],[21],[23]     7,012 [18],[21],[23]   7,012 [15],[26],[32]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[32]       7,012                
Fair Value, Ending Balance 6,925 [18],[23]     6,925 [18],[23]   7,012 [15],[32]            
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 2                        
Principal amount or par value 4,453 [18],[19],[21]     4,453 [18],[19],[21]   4,453 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       4,453                
Fair Value, Ending Balance 4,398 [18],[19]     4,398 [18],[19]   4,453 [15],[16]            
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 1                        
Principal amount or par value 18,266 [18],[19],[21]     18,266 [18],[19],[21]   18,266 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       18,266                
Fair Value, Ending Balance 17,637 [18],[19]     17,637 [18],[19]   18,266 [15],[16]            
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 2                        
Principal amount or par value 7,500 [18],[21],[24]     7,500 [18],[21],[24]   7,500 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       7,500                
Fair Value, Ending Balance 7,242 [18],[24]     7,242 [18],[24]   7,500 [15],[25]            
Investment, Identifier [Axis]: Calabrio, Inc., First lien                        
Principal amount or par value 12,347 [18],[21],[41]     12,347 [18],[21],[41]   12,347 [15],[26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42]       12,271                
Fair Value, Ending Balance 12,347 [18],[41]     12,347 [18],[41]   12,271 [15],[42]            
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                        
Principal amount or par value 1,487 [18],[19],[21],[22]     1,487 [18],[19],[21],[22]   1,487 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (9)                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   (9) [15],[16],[27]            
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                        
Principal amount or par value 12,005 [21],[23]     12,005 [21],[23]   12,096 [26],[32]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [32]       12,083                
Fair Value, Ending Balance 11,434 [23]     11,434 [23]   12,083 [32]            
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                        
Principal amount or par value 9,767 [18],[21],[23]     9,767 [18],[21],[23]   9,767 [15],[26],[32]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[32]       9,864                
Fair Value, Ending Balance 9,767 [18],[23]     9,767 [18],[23]   9,864 [15],[32]            
Investment, Identifier [Axis]: Castle Management Borrower LLC, First lien                        
Principal amount or par value 14,440 [18],[21],[28]     14,440 [18],[21],[28]   14,590 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       12,794                
Fair Value, Ending Balance 13,550 [18],[28]     13,550 [18],[28]   12,794 [15],[29]            
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 1                        
Principal amount or par value 47,838 [19],[21]     47,838 [19],[21]   47,838 [16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       43,293                
Fair Value, Ending Balance 42,177 [19]     42,177 [19]   43,293 [16]            
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 2                        
Principal amount or par value 7,500 [21],[24]     7,500 [21],[24]   7,500 [25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [25]       6,788                
Fair Value, Ending Balance 6,613 [24]     6,613 [24]   6,788 [25]            
Investment, Identifier [Axis]: Community Brands ParentCo, LLC (f.k.a Ministry Brands, LLC), First lien                        
Principal amount or par value [15],[26],[29]           2,872            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       2,872                
Fair Value, Ending Balance [15],[29]           2,872            
Investment, Identifier [Axis]: Community Brands ParentCo, LLC (f.k.a Ministry Brands, LLC), First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27]           1,000            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: Community Brands ParentCo, LLC (f.k.a Ministry Brands, LLC), Second lien 1                        
Principal amount or par value [15],[25],[26]           7,840            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       7,840                
Fair Value, Ending Balance [15],[25]           7,840            
Investment, Identifier [Axis]: Community Brands ParentCo, LLC (f.k.a Ministry Brands, LLC), Second lien 2                        
Principal amount or par value [15],[16],[26]           2,160            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       2,160                
Fair Value, Ending Balance [15],[16]           2,160            
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien                        
Principal amount or par value [18],[21],[28] 7,181     7,181                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 7,066     7,066                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                        
Principal amount or par value [18],[19],[21],[22] 425     425                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (7)     (7)                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                        
Principal amount or par value [18],[19],[21],[22] 849     849                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (14)     (14)                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien                        
Principal amount or par value [15],[26],[32]           19,263            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[32],[37]       19,263                
Fair Value, Ending Balance [15],[32],[37]           19,263            
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                        
Principal amount or par value [18],[21],[23] 19,263     19,263                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[23] 18,945     18,945                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                        
Principal amount or par value [18],[21],[23] 3,217     3,217                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[23] 3,163     3,163                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                        
Principal amount or par value 1,013 [18],[19],[21],[22]     1,013 [18],[19],[21],[22]   1,013 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 1                        
Principal amount or par value 13,830 [18],[21],[41]     13,830 [18],[21],[41]   13,937 [15],[26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42]       13,937                
Fair Value, Ending Balance 13,830 [18],[41]     13,830 [18],[41]   13,937 [15],[42]            
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 2                        
Principal amount or par value 2,489 [18],[21],[41]     2,489 [18],[21],[41]   2,507 [15],[26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42]       2,507                
Fair Value, Ending Balance 2,489 [18],[41]     2,489 [18],[41]   2,507 [15],[42]            
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien                        
Principal amount or par value [26],[29]           19,878            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       19,803                
Fair Value, Ending Balance [29]           19,803            
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Drawn                        
Principal amount or par value 1,644 [18],[19],[21],[22]     1,644 [18],[19],[21],[22]   1,919 [16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       1,912                
Fair Value, Ending Balance 1,642 [18],[19],[22]     1,642 [18],[19],[22]   1,912 [16],[27]            
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn                        
Principal amount or par value 1,642 [18],[19],[21],[22]     1,642 [18],[19],[21],[22]   3,005 [16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       (11)                
Fair Value, Ending Balance (1) [18],[19],[22]     (1) [18],[19],[22]   (11) [16],[27]            
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                        
Principal amount or par value [18],[21],[28] 19,714     19,714                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 19,696     19,696                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                        
Principal amount or par value [18],[21],[28] 7,063     7,063                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 7,057     7,057                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 3                        
Principal amount or par value [18],[19],[21] 3,281     3,281                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 3,278     3,278                
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                        
Principal amount or par value 20,313 [19],[21]     20,313 [19],[21]   20,313 [16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       20,465                
Fair Value, Ending Balance 19,049 [19]     19,049 [19]   20,465 [16]            
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 1                        
Principal amount or par value [18],[19],[21],[22] 2,405     2,405                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (7)     (7)                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 2                        
Principal amount or par value [18],[21],[22],[23] 2,457     2,457                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[23] (7)     (7)                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 3                        
Principal amount or par value [18],[19],[21],[22] 6,561     6,561                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (19)     (19)                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                        
Principal amount or par value [18],[21],[24] 18,760     18,760                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 18,706     18,706                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                        
Principal amount or par value [18],[21],[23] 7,025     7,025                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[23] 7,005     7,005                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien                        
Principal amount or par value [15],[25],[26]           13,277            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       13,144                
Fair Value, Ending Balance [15],[25]           13,144            
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                        
Principal amount or par value 524 [18],[19],[21],[22]     524 [18],[19],[21],[22]   986 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (10)                
Fair Value, Ending Balance (15) [18],[19],[22]     (15) [18],[19],[22]   (10) [15],[16],[27]            
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                        
Principal amount or par value 986 [18],[19],[21],[22]     986 [18],[19],[21],[22]   1,638 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (16)                
Fair Value, Ending Balance (26) [18],[19],[22]     (26) [18],[19],[22]   $ (16) [15],[16],[27]            
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                        
Principal amount or par value [18],[21],[24] 13,177     13,177                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 12,808     12,808                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                        
Principal amount or par value [18],[21],[28] 1,110     1,110                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 1,079     $ 1,079                
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 [15],[16],[43]       $ 60,180                
Fair Value, Ending Balance 59,862 [18],[19],[44]     59,862 [18],[19],[44]   $ 60,180 [15],[16],[43]            
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           4,026            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       3,985                
Fair Value, Ending Balance [15],[16],[27]           3,985            
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien                        
Principal amount or par value 37,956 [18],[21],[28]     37,956 [18],[21],[28]   38,244 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       37,861                
Fair Value, Ending Balance 37,220 [18],[28]     37,220 [18],[28]   37,861 [15],[29]            
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 1                        
Principal amount or par value [18],[19],[21],[22] 3,995     3,995                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 3,918     3,918                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 2                        
Principal amount or par value [18],[19],[21],[22] 1,413     1,413                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 1,385     1,385                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 1                        
Principal amount or par value 1,614 [18],[19],[21],[22]     1,614 [18],[19],[21],[22]   3,027 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (30)                
Fair Value, Ending Balance (31) [18],[19],[22]     (31) [18],[19],[22]   (30) [15],[16],[27]            
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 2                        
Principal amount or par value 9,080 [18],[19],[21],[22]     9,080 [18],[19],[21],[22]   9,080 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (91)                
Fair Value, Ending Balance $ (176) [18],[19],[22]     $ (176) [18],[19],[22]   $ (91) [15],[16],[27]            
Investment, Identifier [Axis]: Diamond Parent Holdings Corp, Wholly-owned subsidiaries                        
Number of investments held | investment 2     2   2 2 2   2    
Investment, Identifier [Axis]: Diligent Corporation, First lien                        
Number of investments held | investment 3     3   3 3 3   3    
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] $ 1,812     $ 1,812                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 1,812     1,812                
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn                        
Principal amount or par value 1,812 [18],[19],[21],[22],[45]     1,812 [18],[19],[21],[22],[45]   $ 3,624 [15],[16],[26],[27],[46]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27],[46]       0                
Fair Value, Ending Balance 0 [18],[19],[22],[45]     0 [18],[19],[22],[45]   0 [15],[16],[27],[46]            
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                        
Principal amount or par value 17,628 [18],[21],[28]     17,628 [18],[21],[28]   17,762 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       17,673                
Fair Value, Ending Balance 17,415 [18],[28]     17,415 [18],[28]   17,673 [15],[29]            
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                        
Principal amount or par value 9,830 [18],[21],[28]     9,830 [18],[21],[28]   9,905 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       9,855                
Fair Value, Ending Balance 9,713 [18],[28]     9,713 [18],[28]   9,855 [15],[29]            
Investment, Identifier [Axis]: Diligent Corporation, First lien 3                        
Principal amount or par value 5,842 [18],[19],[21]     5,842 [18],[19],[21]   5,887 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       5,945                
Fair Value, Ending Balance 5,842 [18],[19]     $ 5,842 [18],[19]   $ 5,945 [15],[16]            
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 [15],[16],[46]       $ 10,379                
Fair Value, Ending Balance 11,304 [18],[19],[45]     11,304 [18],[19],[45]   $ 10,379 [15],[16],[46]            
Investment, Identifier [Axis]: EAB Global, Inc., Second lien                        
Principal amount or par value 33,452 [18],[21],[28]     33,452 [18],[21],[28]   33,452 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       32,951                
Fair Value, Ending Balance 32,392 [18],[28]     32,392 [18],[28]   32,951 [15],[29]            
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                        
Principal amount or par value 16,207 [18],[19],[21],[47]     16,207 [18],[19],[21],[47]   15,434 [15],[16],[26],[48]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[48]       15,841                
Fair Value, Ending Balance 16,207 [18],[19],[47]     16,207 [18],[19],[47]   15,841 [15],[16],[48]            
Investment, Identifier [Axis]: Education Management Corporation, Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       0                
Fair Value, Ending Balance [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 [16]       0                
Fair Value, Ending Balance [16]           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 [29]       0                
Fair Value, Ending Balance 0 [28]     0 [28]   0 [29]            
Investment, Identifier [Axis]: Education Management Corporation, Preferred shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       0                
Fair Value, Ending Balance 0 [19]     0 [19]   0 [16]            
Investment, Identifier [Axis]: Education Management Corporation, Preferred shares 3                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [28] 0     0                
Investment, Identifier [Axis]: Education Management Corporation, Preferred shares 4                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [19] 0     0                
Investment, Identifier [Axis]: Education Management II LLC, First lien 1                        
Principal amount or par value 300 [21],[28]     300 [21],[28]   300 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       0                
Fair Value, Ending Balance 0 [28]     0 [28]   0 [29]            
Investment, Identifier [Axis]: Education Management II LLC, First lien 2                        
Principal amount or par value 169 [19],[21]     169 [19],[21]   169 [16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       0                
Fair Value, Ending Balance 0 [19]     0 [19]   0 [16]            
Investment, Identifier [Axis]: Education Management II LLC, First lien 3                        
Principal amount or par value 206 [21],[28]     206 [21],[28]   206 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       0                
Fair Value, Ending Balance 0 [28]     0 [28]   0 [29]            
Investment, Identifier [Axis]: Education Management II LLC, First lien 4                        
Principal amount or par value 116 [19],[21]     116 [19],[21]   116 [16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       0                
Fair Value, Ending Balance 0 [19]     0 [19]   0 [16]            
Investment, Identifier [Axis]: Education Management II LLC, First lien 5                        
Principal amount or par value 140 [21],[28]     140 [21],[28]   140 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       0                
Fair Value, Ending Balance 0 [28]     0 [28]   0 [29]            
Investment, Identifier [Axis]: Education Management II LLC, First lien 6                        
Principal amount or par value 79 [19],[21]     79 [19],[21]   79 [16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       0                
Fair Value, Ending Balance 0 [19]     0 [19]   0 [16]            
Investment, Identifier [Axis]: Education Management II LLC, First lien 7                        
Principal amount or par value 4 [21],[28]     4 [21],[28]   4 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       0                
Fair Value, Ending Balance 0 [28]     0 [28]   0 [29]            
Investment, Identifier [Axis]: Education Management II LLC, First lien 8                        
Principal amount or par value 2 [19],[21]     2 [19],[21]   2 [16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       0                
Fair Value, Ending Balance 0 [19]     0 [19]   0 [16]            
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 [18],[21],[28]     7,950 [18],[21],[28]   7,950 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       7,910                
Fair Value, Ending Balance 7,530 [18],[28]     7,530 [18],[28]   7,910 [29]            
Investment, Identifier [Axis]: FR Arsenal Holdings II Corp., First lien                        
Principal amount or par value 14,622 [18],[21],[28]     14,622 [18],[21],[28]   14,884 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       14,520                
Fair Value, Ending Balance $ 12,553 [18],[28]     $ 12,553 [18],[28]   14,520 [15],[29]            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien                        
Principal amount or par value [26],[42]           $ 10,500            
Number of investments held | investment 2     2   2 2 2   2    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [42]       $ 10,395                
Fair Value, Ending Balance [42]           $ 10,395            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn                        
Principal amount or par value [26],[27],[42]           2,618            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [27],[42]       2,592                
Fair Value, Ending Balance [27],[42]           2,592            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 1                        
Principal amount or par value [18],[19],[21],[22] $ 280     280                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 277     277                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 2                        
Principal amount or par value [18],[19],[21],[22] 14     14                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 14     14                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                        
Principal amount or par value 1,120 [18],[19],[21],[22]     1,120 [18],[19],[21],[22]   882 [26],[27],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [27],[42]       (9)                
Fair Value, Ending Balance (11) [18],[19],[22]     (11) [18],[19],[22]   (9) [27],[42]            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                        
Principal amount or par value 5,741 [18],[19],[21],[22]     5,741 [18],[19],[21],[22]   1,400 [16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       (14)                
Fair Value, Ending Balance (57) [18],[19],[22]     (57) [18],[19],[22]   (14) [16],[27]            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 3                        
Principal amount or par value [26],[27],[42]           3,500            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [27],[42]       (35)                
Fair Value, Ending Balance [27],[42]           (35)            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                        
Principal amount or par value [18],[21],[41] 10,421     10,421                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[41] 10,317     10,317                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                        
Principal amount or par value [18],[21],[41] 3,498     3,498                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[41] 3,463     3,463                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                        
Principal amount or par value [18],[21],[41] 3,476     3,476                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[41] 3,441     3,441                
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [42],[49]       5,000                
Fair Value, Ending Balance 5,000 [18],[41],[50]     5,000 [18],[41],[50]   5,000 [42],[49]            
Investment, Identifier [Axis]: Foreside Financial Group, First lien 1                        
Principal amount or par value [18],[21],[28] 32,048     32,048                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 31,728     31,728                
Investment, Identifier [Axis]: Foreside Financial Group, First lien 2                        
Principal amount or par value [18],[19],[21] 314     314                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 310     310                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                        
Principal amount or par value [18],[19],[21],[22] 2,095     2,095                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (21)     (21)                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                        
Principal amount or par value [18],[19],[21],[22] 6,670     6,670                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (67)     (67)                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 191     191                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 189     189                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                        
Principal amount or par value 958 [18],[19],[21],[22]     958 [18],[19],[21],[22]   2,861 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (29)                
Fair Value, Ending Balance (10) [18],[19],[22]     (10) [18],[19],[22]   (29) [15],[16],[27]            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                        
Principal amount or par value 2,670 [18],[19],[21],[22]     2,670 [18],[19],[21],[22]   8,343 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (83)                
Fair Value, Ending Balance (28) [18],[19],[22]     (28) [18],[19],[22]   (83) [15],[16],[27]            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 3                        
Principal amount or par value [18],[19],[21],[22] 4,886     4,886                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (51)     (51)                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                        
Principal amount or par value 17,574 [18],[21],[28]     17,574 [18],[21],[28]   10,298 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       10,195                
Fair Value, Ending Balance 17,391 [18],[28]     17,391 [18],[28]   10,195 [15],[25]            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                        
Principal amount or par value 10,221 [18],[21],[24]     10,221 [18],[21],[24]   10,298 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       10,195                
Fair Value, Ending Balance 10,115 [18],[24]     10,115 [18],[24]   10,195 [15],[29]            
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                        
Principal amount or par value 22,500 [18],[21],[41]     22,500 [18],[21],[41]   22,500 [26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [42]       22,500                
Fair Value, Ending Balance 21,533 [18],[41]     21,533 [18],[41]   22,500 [42]            
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                        
Principal amount or par value 7,009 [18],[21],[28]     7,009 [18],[21],[28]   5,009 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       5,009                
Fair Value, Ending Balance 6,708 [18],[28]     6,708 [18],[28]   5,009 [29]            
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First Lien 1                        
Principal amount or par value [21],[23] 21,447     21,447                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [23] 21,447     21,447                
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First Lien 2                        
Principal amount or par value [21],[28] 8,074     8,074                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [28] 8,074     8,074                
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First Lien 3                        
Principal amount or par value [21],[28] 7,461     7,461                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [28] 7,461     7,461                
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First Lien 4                        
Principal amount or par value [21],[28] 4,969     4,969                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [28] 4,969     4,969                
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First lien 1                        
Principal amount or par value [15],[26],[32]           21,718            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[32]       21,718                
Fair Value, Ending Balance [15],[32]           21,718            
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First lien 2                        
Principal amount or par value [15],[26],[29]           18,303            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       18,303                
Fair Value, Ending Balance [15],[29]           18,303            
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First lien 3                        
Principal amount or par value [15],[26],[29]           7,555            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       7,555                
Fair Value, Ending Balance [15],[29]           7,555            
Investment, Identifier [Axis]: Frontline Technologies Group Holdings, LLC, First lien 4                        
Principal amount or par value [15],[26],[29]           5,031            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       5,031                
Fair Value, Ending Balance [15],[29]           5,031            
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 4,486     4,486                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 4,432     4,432                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien 1                        
Principal amount or par value [18],[21],[41] 21,941     21,941                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[41] 21,678     21,678                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien 2                        
Principal amount or par value [18],[21],[28] 13,244     13,244                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 13,086     13,086                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien 3                        
Principal amount or par value [18],[21],[28] 10,577     10,577                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 10,449     10,449                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn                        
Principal amount or par value [15],[26],[27],[29]           5,643            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[27],[29]       5,643                
Fair Value, Ending Balance [15],[27],[29]           5,643            
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 3,951 [18],[19],[21],[22]     3,951 [18],[19],[21],[22]   4,991 [15],[26],[27],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[27],[29]       0                
Fair Value, Ending Balance (47) [18],[19],[22]     (47) [18],[19],[22]   0 [15],[27],[29]            
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 12,920 [18],[19],[21],[22]     12,920 [18],[19],[21],[22]   3,951 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance (155) [18],[19],[22]     (155) [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                        
Principal amount or par value [15],[26],[42]           22,108            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42]       22,108                
Fair Value, Ending Balance [15],[42]           22,108            
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                        
Principal amount or par value [15],[26],[29]           13,345            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       13,345                
Fair Value, Ending Balance [15],[29]           13,345            
Investment, Identifier [Axis]: GEMS Menasa (Cayman) Limited, First lien                        
Principal amount or par value [25],[26]           10,534            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [25],[37]       10,589                
Fair Value, Ending Balance [25],[37]           10,589            
Investment, Identifier [Axis]: GS Acquisitionco, Inc, First Lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 4,142     4,142                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 4,105     4,105                
Investment, Identifier [Axis]: GS Acquisitionco, Inc, First Lien 1                        
Principal amount or par value [18],[21],[28] 67,448     67,448                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 66,846     66,846                
Investment, Identifier [Axis]: GS Acquisitionco, Inc, First Lien 2                        
Principal amount or par value [18],[21],[41] 21,801     21,801                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[41] 21,607     21,607                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           2,811            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       2,811                
Fair Value, Ending Balance [15],[16],[27]           2,811            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27]           3,106            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                        
Principal amount or par value [15],[26],[29]           67,966            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       67,966                
Fair Value, Ending Balance [15],[29]           67,966            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                        
Principal amount or par value [15],[26],[42]           21,968            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42]       21,968                
Fair Value, Ending Balance [15],[42]           21,968            
Investment, Identifier [Axis]: Galway Borrower LLC, First lien - Undrawn 1                        
Principal amount or par value [15],[16],[26],[27]           1,865            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (19)                
Fair Value, Ending Balance [15],[16],[27]           (19)            
Investment, Identifier [Axis]: Galway Borrower LLC, First lien - Undrawn 2                        
Principal amount or par value [15],[16],[26],[27]           3,917            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (39)                
Fair Value, Ending Balance [15],[16],[27]           (39)            
Investment, Identifier [Axis]: Galway Borrower LLC, First lien 1                        
Principal amount or par value [15],[26],[29]           24,279            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       24,036                
Fair Value, Ending Balance [15],[29]           24,036            
Investment, Identifier [Axis]: Galway Borrower LLC, First lien 2                        
Principal amount or par value [15],[16],[26]           1,674            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       1,658                
Fair Value, Ending Balance [15],[16]           1,658            
Investment, Identifier [Axis]: Geo Parent Corporation, First lien                        
Principal amount or par value [26],[29]           9,810            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       9,761                
Fair Value, Ending Balance [29]           9,761            
Investment, Identifier [Axis]: Granicus, Inc., First lien - Drawn                        
Principal amount or par value 2,758 [18],[21],[22],[28]     2,758 [18],[21],[22],[28]   2,778 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       2,751                
Fair Value, Ending Balance 2,758 [18],[22],[28]     2,758 [18],[22],[28]   2,751 [15],[16],[27]            
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn 1                        
Principal amount or par value 1,822 [18],[21],[22],[28]     1,822 [18],[21],[22],[28]   2,414 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (18)                
Fair Value, Ending Balance 0 [18],[22],[28]     0 [18],[22],[28]   (18) [15],[16],[27]            
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn 2                        
Principal amount or par value 2,414 [18],[19],[21],[22]     2,414 [18],[19],[21],[22]   1,822 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (18)                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   (18) [15],[16],[27]            
Investment, Identifier [Axis]: Granicus, Inc., First lien 1                        
Principal amount or par value 15,405 [18],[21],[23]     15,405 [18],[21],[23]   15,522 [15],[26],[32]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[32]       15,406                
Fair Value, Ending Balance 15,405 [18],[23]     15,405 [18],[23]   15,406 [15],[32]            
Investment, Identifier [Axis]: Granicus, Inc., First lien 2                        
Principal amount or par value 5,959 [18],[21],[24]     5,959 [18],[21],[24]   6,004 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       5,959                
Fair Value, Ending Balance 5,959 [18],[24]     5,959 [18],[24]   5,959 [15],[16]            
Investment, Identifier [Axis]: Granicus, Inc., First lien 3                        
Principal amount or par value 5,877 [18],[21],[28]     5,877 [18],[21],[28]   5,922 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       5,878                
Fair Value, Ending Balance 5,877 [18],[28]     $ 5,877 [18],[28]   $ 5,878 [15],[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 [15],[37],[51],[52]       $ 4,834                
Fair Value, Ending Balance 5,125 [18],[53],[54]     5,125 [18],[53],[54]   $ 4,834 [15],[37],[51],[52]            
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                        
Principal amount or par value [18],[21],[41] 22,500     22,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[41] 21,868     21,868                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                        
Principal amount or par value [18],[21],[28] 4,208     4,208                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 4,090     4,090                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                        
Principal amount or par value [26],[42]           22,500            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [42]       22,509                
Fair Value, Ending Balance [42]           22,509            
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                        
Principal amount or par value [26],[29]           4,208            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       4,210                
Fair Value, Ending Balance [29]           4,210            
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[55] 27,125     27,125                
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Profit Interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[56] 83     83                
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                        
Principal amount or par value [18],[19],[21],[22],[57] 8,000     8,000                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22],[57] 0     0                
Investment, Identifier [Axis]: Haven Midstream LLC, First lien 1                        
Principal amount or par value [18],[19],[21] 33,889     33,889                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 33,889     33,889                
Investment, Identifier [Axis]: Haven Midstream LLC, First lien 2                        
Principal amount or par value [18],[19],[21] 11,972     11,972                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 11,972     11,972                
Investment, Identifier [Axis]: Hill International, Inc., First lien                        
Principal amount or par value 14,971 [18],[21],[28]     14,971 [18],[21],[28]   15,089 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       15,089                
Fair Value, Ending Balance 14,971 [18],[28]     14,971 [18],[28]   15,089 [15],[29]            
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien                        
Principal amount or par value [15],[26],[29]           29,429            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       29,133                
Fair Value, Ending Balance [15],[29]           29,133            
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           1,149            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       1,137                
Fair Value, Ending Balance [15],[16],[27]           1,137            
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                        
Principal amount or par value 2,298 [18],[19],[21],[22]     2,298 [18],[19],[21],[22]   1,149 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (11)                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   (11) [15],[16],[27]            
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                        
Principal amount or par value [18],[21],[28] 29,207     29,207                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 29,207     29,207                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                        
Principal amount or par value [18],[21],[28] 4,268     4,268                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 4,268     4,268                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien                        
Principal amount or par value [18],[21],[28] 13,007     13,007                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 12,877     12,877                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 186     186                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 184     184                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value [18],[19],[21],[22] 1,363     1,363                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (14)     (14)                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value [18],[19],[21],[22] 3,097     3,097                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (31)     (31)                
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                        
Principal amount or par value 22,500 [18],[21],[23]     22,500 [18],[21],[23]   22,500 [26],[32]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [32]       22,613                
Fair Value, Ending Balance 21,647 [18],[23]     21,647 [18],[23]   22,613 [32]            
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                        
Principal amount or par value 3,000 [18],[19],[21]     3,000 [18],[19],[21]   3,000 [16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       3,015                
Fair Value, Ending Balance 2,886 [18],[19]     2,886 [18],[19]   3,015 [16]            
Investment, Identifier [Axis]: Infogain Corporation, First lien                        
Principal amount or par value [15],[26],[29]           19,090            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       18,946                
Fair Value, Ending Balance [15],[29]           18,946            
Investment, Identifier [Axis]: Infogain Corporation, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 678     678                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 671     671                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Subordinated                        
Principal amount or par value [18],[19],[21] 17,245     17,245                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 17,029     17,029                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                        
Principal amount or par value 3,150 [18],[19],[21],[22]     3,150 [18],[19],[21],[22]   3,827 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (29)                
Fair Value, Ending Balance (31) [18],[19],[22]     (31) [18],[19],[22]   (29) [15],[16],[27]            
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                        
Principal amount or par value [18],[21],[28] 18,946     18,946                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 18,757     18,757                
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                        
Principal amount or par value [18],[21],[24] 7,943     7,943                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 7,864     7,864                
Investment, Identifier [Axis]: Integro Parent Inc., First lien                        
Principal amount or par value [15],[26],[29]           33,986            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       33,239                
Fair Value, Ending Balance [15],[29]           33,239            
Investment, Identifier [Axis]: Integro Parent Inc., First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           6,743            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       6,685                
Fair Value, Ending Balance [15],[16],[27]           6,685            
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                        
Principal amount or par value [18],[21],[28] 4,026     4,026                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 4,026     4,026                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                        
Principal amount or par value [18],[19],[21] 795     795                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 795     795                
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                        
Principal amount or par value 11,068 [18],[21],[24]     11,068 [18],[21],[24]   10,000 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       9,534                
Fair Value, Ending Balance 7,169 [18],[24]     7,169 [18],[24]   9,534 [15],[25]            
Investment, Identifier [Axis]: Integro Parent Inc., Second lien, Non-accrual status                        
Principal amount or par value                 $ 3,874      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 2,509     2,509                
Investment, Identifier [Axis]: KAMC Holdings, Inc, Second lien 1                        
Principal amount or par value 18,750 [18],[21],[28]     18,750 [18],[21],[28]   18,750 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       16,352                
Fair Value, Ending Balance 16,279 [18],[28]     16,279 [18],[28]   16,352 [15],[29]            
Investment, Identifier [Axis]: KAMC Holdings, Inc, Second lien 2                        
Principal amount or par value 18,750 [18],[21],[24]     18,750 [18],[21],[24]   18,750 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       16,352                
Fair Value, Ending Balance 16,279 [18],[24]     16,279 [18],[24]   16,352 [15],[25]            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien                        
Principal amount or par value [15],[25],[26]           7,039            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       6,968                
Fair Value, Ending Balance [15],[25]           6,968            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                        
Principal amount or par value 146 [18],[21],[22],[28]     146 [18],[21],[22],[28]   402 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       398                
Fair Value, Ending Balance 144 [18],[22],[28]     144 [18],[22],[28]   398 [15],[16],[27]            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27]           403            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (4)                
Fair Value, Ending Balance [15],[16],[27]           (4)            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn 1                        
Principal amount or par value [18],[21],[22],[28] 1,022     1,022                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[28] (13)     (13)                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                        
Principal amount or par value [18],[21],[24] 6,986     6,986                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 6,899     6,899                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                        
Principal amount or par value [18],[21],[28] 802     802                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 793     793                
Investment, Identifier [Axis]: Kaseya Inc., First lien                        
Principal amount or par value [18],[21],[28],[58] 63,093     63,093                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28],[58] 62,620     62,620                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           1,541            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       1,541                
Fair Value, Ending Balance [15],[16],[27]           1,541            
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                        
Principal amount or par value 3,851 [18],[19],[21],[22]     3,851 [18],[19],[21],[22]   2,129 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance (29) [18],[19],[22]     (29) [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                        
Principal amount or par value 3,851 [18],[19],[21],[22]     3,851 [18],[19],[21],[22]   2,312 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance (29) [18],[19],[22]     (29) [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: Kaseya Inc., First lien 1                        
Principal amount or par value [15],[25],[26]           29,094            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       29,094                
Fair Value, Ending Balance [15],[25]           29,094            
Investment, Identifier [Axis]: Kaseya Inc., First lien 2                        
Principal amount or par value [15],[25],[26]           7,795            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       7,795                
Fair Value, Ending Balance [15],[25]           7,795            
Investment, Identifier [Axis]: Kaseya Inc., First lien 3                        
Principal amount or par value [15],[16],[26]           3,405            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       3,405                
Fair Value, Ending Balance [15],[16]           3,405            
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien                        
Principal amount or par value 15,828 [18],[21],[41]     15,828 [18],[21],[41]   15,949 [26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [42]       15,870                
Fair Value, Ending Balance 15,828 [18],[41]     15,828 [18],[41]   15,870 [42]            
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Drawn                        
Principal amount or par value [16],[26],[27]           630            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       627                
Fair Value, Ending Balance [16],[27]           627            
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                        
Principal amount or par value 1,799 [18],[19],[21],[22]     1,799 [18],[19],[21],[22]   1,169 [16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       (6)                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   (6) [16],[27]            
Investment, Identifier [Axis]: Keystone Acquisition Corp., First lien                        
Principal amount or par value [26],[29]           23,981            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       23,861                
Fair Value, Ending Balance [29]           23,861            
Investment, Identifier [Axis]: Keystone Acquisition Corp., Second lien                        
Principal amount or par value [15],[26],[29]           4,500            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       $ 4,500                
Fair Value, Ending Balance [15],[29]           4,500            
Investment, Identifier [Axis]: Knockout Intermediate Holdings I, Preferred shares                        
Preferred equity dividend rate       11.75%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[58] 14,961     $ 14,961                
Investment, Identifier [Axis]: MED Parentco, LP, Second lien                        
Principal amount or par value 20,857 [18],[21],[24]     20,857 [18],[21],[24]   20,857 [25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [25]       20,883                
Fair Value, Ending Balance 18,180 [18],[24]     18,180 [18],[24]   20,883 [25]            
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                        
Principal amount or par value 2,002 [19],[21],[22]     2,002 [19],[21],[22]   9,364 [15],[26],[27],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[27],[29]       0                
Fair Value, Ending Balance (45) [19],[22]     (45) [19],[22]   0 [15],[27],[29]            
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 2                        
Principal amount or par value 5,266 [19],[21],[22]     5,266 [19],[21],[22]   2,002 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance (118) [19],[22]     (118) [19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                        
Principal amount or par value 21,936 [21],[41]     21,936 [21],[41]   22,104 [15],[26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42]       22,104                
Fair Value, Ending Balance 21,442 [41]     21,442 [41]   22,104 [15],[42]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                        
Principal amount or par value 4,627 [21],[28]     4,627 [21],[28]   6,205 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       6,205                
Fair Value, Ending Balance 4,523 [28]     4,523 [28]   6,205 [15],[29]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                        
Principal amount or par value 3,181 [21],[28]     3,181 [21],[28]   818 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       818                
Fair Value, Ending Balance 3,109 [28]     3,109 [28]   818 [15],[16]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                        
Principal amount or par value 2,482 [19],[21]     2,482 [19],[21]   319 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       319                
Fair Value, Ending Balance 2,426 [19]     2,426 [19]   319 [15],[29]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                        
Principal amount or par value [19],[21] 812     812                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [19] 794     794                
Investment, Identifier [Axis]: NHME Holdings Corp., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[59]       2,000                
Fair Value, Ending Balance 0 [18],[19],[60]     0 [18],[19],[60]   2,000 [15],[16],[59]            
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[59]       500                
Fair Value, Ending Balance 0 [18],[19],[60]     0 [18],[19],[60]   500 [15],[16],[59]            
Investment, Identifier [Axis]: NM APP Canada Corp., Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[37],[61]       9,422                
Fair Value, Ending Balance 11,620 [18],[38],[62]     11,620 [18],[38],[62]   9,422 [15],[37],[61]            
Investment, Identifier [Axis]: NM APP US LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[61]       14,891                
Fair Value, Ending Balance 0 [18],[62]     0 [18],[62]   14,891 [15],[61]            
Investment, Identifier [Axis]: NM CLFX LP, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[61]       24,676                
Fair Value, Ending Balance 17,522 [18],[62]     17,522 [18],[62]   24,676 [15],[61]            
Investment, Identifier [Axis]: NM DRVT LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[61]       7,984                
Fair Value, Ending Balance 0 [18],[62]     0 [18],[62]   7,984 [15],[61]            
Investment, Identifier [Axis]: NM GLCR LP, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[61]       50,687                
Fair Value, Ending Balance 0 [18],[62]     0 [18],[62]   50,687 [15],[61]            
Investment, Identifier [Axis]: NM GP Holdco, LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[37],[61]       1,197                
Fair Value, Ending Balance 1,038 [18],[38],[62]     1,038 [18],[38],[62]   1,197 [15],[37],[61]            
Investment, Identifier [Axis]: NM GRC Holdco, LLC, First lien 1                        
Principal amount or par value [15],[26],[29]           38,561            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       38,561                
Fair Value, Ending Balance [15],[29]           38,561            
Investment, Identifier [Axis]: NM GRC Holdco, LLC, First lien 2                        
Principal amount or par value [15],[26],[29]           10,718            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       10,718                
Fair Value, Ending Balance [15],[29]           10,718            
Investment, Identifier [Axis]: NM JRA LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[61]       3,996                
Fair Value, Ending Balance 0 [18],[62]     0 [18],[62]   3,996 [15],[61]            
Investment, Identifier [Axis]: NM KRLN LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[61]       244                
Fair Value, Ending Balance 0     0   244 [15],[61]            
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 [15],[37],[61]       107,870                
Fair Value, Ending Balance 95,356 [18],[38],[62]     95,356 [18],[38],[62]   107,870 [15],[37],[61]            
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[61]       8,286                
Fair Value, Ending Balance 9,375 [18],[62]     9,375 [18],[62]   8,286 [15],[61]            
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27]           10,664            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (160)                
Fair Value, Ending Balance [15],[16],[27]           (160)            
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                        
Principal amount or par value 19,259 [18],[21],[24]     19,259 [18],[21],[24]   19,259 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       18,970                
Fair Value, Ending Balance 19,232 [18],[24]     19,232 [18],[24]   18,970 [15],[25]            
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                        
Principal amount or par value 4,913 [18],[21],[28]     4,913 [18],[21],[28]   4,913 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       4,839                
Fair Value, Ending Balance 4,906 [18],[28]     4,906 [18],[28]   4,839 [15],[29]            
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 [15],[16],[37]       140,000                
Fair Value, Ending Balance 140,000 [18],[19],[38]     140,000 [18],[19],[38]   140,000 [15],[16],[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 [15],[16],[37]       112,400                
Fair Value, Ending Balance 112,400 [18],[19],[38]     112,400 [18],[19],[38]   112,400 [15],[16],[37]            
Investment, Identifier [Axis]: National HME, Inc., Second lien                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 7,021     7,021                
Investment, Identifier [Axis]: National HME, Inc., Second lien 1                        
Principal amount or par value 17,102 [18],[19],[21]     17,102 [18],[19],[21]   21,016 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       13,030                
Fair Value, Ending Balance 7,021 [18],[19]     7,021 [18],[19]   13,030 [15],[16]            
Investment, Identifier [Axis]: National HME, Inc., Second lien 2                        
Principal amount or par value 21,647 [18],[19],[21]     21,647 [18],[19],[21]   15,148 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       11,817                
Fair Value, Ending Balance 0 [18],[19]     0 [18],[19]   11,817 [15],[16]            
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                        
Principal amount or par value [15],[16],[26]           3,992            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       3,992                
Fair Value, Ending Balance [15],[16]           3,992            
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                        
Principal amount or par value 34,923 [18],[21],[28]     34,923 [18],[21],[28]   33,133 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       33,133                
Fair Value, Ending Balance 34,923 [18],[28]     34,923 [18],[28]   33,133 [15],[29]            
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                        
Principal amount or par value 8,568 [18],[21],[24]     8,568 [18],[21],[24]   8,129 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       8,129                
Fair Value, Ending Balance 8,568 [18],[24]     8,568 [18],[24]   8,129 [15],[25]            
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                        
Principal amount or par value [18],[19],[21] 4,207     4,207                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 4,207     4,207                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                        
Principal amount or par value 18,126 [18],[19],[21]     18,126 [18],[19],[21]   16,556 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       13,603                
Fair Value, Ending Balance 14,501 [18],[19]     14,501 [18],[19]   13,603 [15],[16]            
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 [15],[29]       34,548                
Fair Value, Ending Balance 34,454 [18],[28]     34,454 [18],[28]   34,548 [15],[29]            
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 [15],[25]       8,476                
Fair Value, Ending Balance 8,453 [18],[24]     8,453 [18],[24]   8,476 [15],[25]            
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 [15],[16]       7,714                
Fair Value, Ending Balance 7,693 [18],[19]     7,693 [18],[19]   7,714 [15],[16]            
Investment, Identifier [Axis]: New Permian Holdco, Inc., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       11,000                
Fair Value, Ending Balance 16,000 [18],[19]     16,000 [18],[19]   11,000 [15],[16]            
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                        
Principal amount or par value 20,830 [18],[19],[21]     20,830 [18],[19],[21]   18,216 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       18,216                
Fair Value, Ending Balance 20,830 [18],[19]     20,830 [18],[19]   18,216 [15],[16]            
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                        
Principal amount or par value 9,489 [18],[19],[21],[22]     9,489 [18],[19],[21],[22]   5,543 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       5,543                
Fair Value, Ending Balance 9,489 [18],[19],[22]     9,489 [18],[19],[22]   5,543 [15],[16],[27]            
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                        
Principal amount or par value 1,577 [18],[19],[21],[22]     1,577 [18],[19],[21],[22]   4,977 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien                        
Principal amount or par value 26,762 [18],[21],[28]     26,762 [18],[21],[28]   26,762 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       26,762                
Fair Value, Ending Balance 19,480 [18],[28]     19,480 [18],[28]   26,762 [29]            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien                        
Principal amount or par value [15],[25],[26]           10,153            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       10,077                
Fair Value, Ending Balance [15],[25]           10,077            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn                        
Principal amount or par value 878 [18],[19],[21],[22]     878 [18],[19],[21],[22]   147 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       146                
Fair Value, Ending Balance 871 [18],[19],[22]     871 [18],[19],[22]   146 [15],[16],[27]            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 1                        
Principal amount or par value 587 [18],[19],[21],[22]     587 [18],[19],[21],[22]   734 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (6)                
Fair Value, Ending Balance (4) [18],[19],[22]     (4) [18],[19],[22]   (6) [15],[16],[27]            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 2                        
Principal amount or par value 880 [18],[19],[21],[22]     880 [18],[19],[21],[22]   1,467 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (11)                
Fair Value, Ending Balance (7) [18],[19],[22]     (7) [18],[19],[22]   (11) [15],[16],[27]            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                        
Principal amount or par value [18],[21],[24] 10,076     10,076                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 10,002     10,002                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                        
Principal amount or par value [18],[21],[24] 9,950     9,950                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 9,875     9,875                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien                        
Principal amount or par value [26],[29],[63]           28,201            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29],[63]       27,919                
Fair Value, Ending Balance [29],[63]           27,919            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                        
Principal amount or par value 3,600 [18],[19],[21],[22],[64]     3,600 [18],[19],[21],[22],[64]   3,600 [16],[26],[27],[63]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27],[63]       (36)                
Fair Value, Ending Balance (36) [18],[19],[22],[64]     (36) [18],[19],[22],[64]   (36) [16],[27],[63]            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                        
Principal amount or par value [18],[21],[28] 28,060     28,060                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 27,780     27,780                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                        
Principal amount or par value [18],[21],[28] 1,776     1,776                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 1,758     1,758                
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[63]       2,000                
Fair Value, Ending Balance 2,000 [18],[19],[64]     $ 2,000 [18],[19],[64]   $ 2,000 [16],[63]            
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 [65],[66]       $ 7,142                
Fair Value, Ending Balance $ 7,054 [18],[67],[68]     $ 7,054 [18],[67],[68]   $ 7,142 [65],[66]            
Investment, Identifier [Axis]: OEConnection LLC, Second lien                        
Number of investments held | investment 2     2   2 2 2   2    
Investment, Identifier [Axis]: OEConnection LLC, Second lien 1                        
Principal amount or par value $ 23,406 [18],[21],[28]     $ 23,406 [18],[21],[28]   $ 23,406 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       23,171                
Fair Value, Ending Balance 22,703 [18],[28]     22,703 [18],[28]   23,171 [29]            
Investment, Identifier [Axis]: OEConnection LLC, Second lien 2                        
Principal amount or par value 12,044 [18],[21],[28]     12,044 [18],[21],[28]   12,044 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       11,924                
Fair Value, Ending Balance 11,683 [18],[28]     11,683 [18],[28]   11,924 [29]            
Investment, Identifier [Axis]: PPV Intermediate Holdings LLC First lien - Undrawn 1                        
Principal amount or par value [18],[19],[21],[22] 486     486                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (5)     (5)                
Investment, Identifier [Axis]: PPV Intermediate Holdings LLC, First lien                        
Principal amount or par value [18],[21],[23] 5,933     5,933                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[23] 5,874     5,874                
Investment, Identifier [Axis]: PPV Intermediate Holdings LLC, First lien - Drawn                        
Principal amount or par value [18],[21],[22],[23] 129     129                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[23] 128     128                
Investment, Identifier [Axis]: PPV Intermediate Holdings LLC, First lien - Undrawn 2                        
Principal amount or par value [18],[21],[22],[23] 1,452     1,452                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[23] (15)     (15)                
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                        
Principal amount or par value 14,500 [18],[19],[21]     14,500 [18],[19],[21]   14,500 [15],[16],[26]           $ 20,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       10,354                
Fair Value, Ending Balance 9,377 [18],[19]     9,377 [18],[19]   10,354 [15],[16]            
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                        
Principal amount or par value 0 [21],[69],[70]     0 [21],[69],[70]   0 [26],[71],[72]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [71],[72]       0                
Fair Value, Ending Balance 0 [69],[70]     0 [69],[70]   0 [71],[72]            
Investment, Identifier [Axis]: Permian Trust, First lien 1                        
Principal amount or par value 247 [18],[21],[73]     247 [18],[21],[73]   247 [15],[26],[74]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[74]       0                
Fair Value, Ending Balance 0 [18],[73]     0 [18],[73]   0 [15],[74]            
Investment, Identifier [Axis]: Permian Trust, First lien 2                        
Principal amount or par value 3,409 [18],[19],[21]     3,409 [18],[19],[21]   3,409 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       0                
Fair Value, Ending Balance 0 [18],[19]     0 [18],[19]   0 [15],[16]            
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First Lien 1                        
Principal amount or par value [18],[21],[28] 49,379     49,379                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 49,379     49,379                
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First Lien 2                        
Principal amount or par value [18],[21],[28] 18,796     18,796                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 18,796     18,796                
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 1                        
Principal amount or par value [15],[26],[29]           49,617            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       49,617                
Fair Value, Ending Balance [15],[29]           49,617            
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 2                        
Principal amount or par value [15],[16],[26]           18,966            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       18,966                
Fair Value, Ending Balance [15],[16]           18,966            
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien                        
Principal amount or par value [15],[25],[26],[75]           13,628            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25],[75]       13,492                
Fair Value, Ending Balance [15],[25],[75]           13,492            
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                        
Principal amount or par value 2,446 [18],[19],[21],[22],[76]     2,446 [18],[19],[21],[22],[76]   2,446 [15],[16],[26],[27],[75]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27],[75]       (24)                
Fair Value, Ending Balance (62) [18],[19],[22],[76]     (62) [18],[19],[22],[76]   (24) [15],[16],[27],[75]            
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                        
Principal amount or par value [18],[21],[24] 14,508     14,508                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 14,160     14,160                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                        
Principal amount or par value [18],[21],[24] 1,988     1,988                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 1,941     1,941                
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 [15],[75],[77]       2,000                
Fair Value, Ending Balance 1,759 [18],[76],[78]     $ 1,759 [18],[76],[78]   $ 2,000 [15],[75],[77]            
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 [15],[16],[79]       $ 10,586                
Fair Value, Ending Balance 11,645 [18],[19],[80]     11,645 [18],[19],[80]   $ 10,586 [15],[16],[79]            
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           2,394            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       2,394                
Fair Value, Ending Balance [15],[16],[27]           2,394            
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn 1                        
Principal amount or par value 483 [18],[19],[21],[22]     483 [18],[19],[21],[22]   2,810 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance (8) [18],[19],[22]     (8) [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn 2                        
Principal amount or par value [15],[16],[26],[27]           905            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: Quartz Holding Company, Second lien                        
Principal amount or par value 10,000 [18],[19],[21]     10,000 [18],[19],[21]   10,000 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       10,000                
Fair Value, Ending Balance 9,802 [18],[19]     9,802 [18],[19]   10,000 [15],[16]            
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                        
Principal amount or par value [16],[26],[27]           750            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       (4)                
Fair Value, Ending Balance [16],[27]           (4)            
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 1                        
Principal amount or par value 24,531 [18],[21],[24]     24,531 [18],[21],[24]   6,219 [25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [25]       6,188                
Fair Value, Ending Balance 24,408 [18],[24]     24,408 [18],[24]   6,188 [25]            
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 2                        
Principal amount or par value 12,684 [18],[21],[28]     12,684 [18],[21],[28]   4,776 [25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [25]       4,752                
Fair Value, Ending Balance 12,621 [18],[28]     12,621 [18],[28]   4,752 [25]            
Investment, Identifier [Axis]: Restaurant Technologies, Inc., Second lien                        
Principal amount or par value [26],[32]           6,722            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [32]       6,722                
Fair Value, Ending Balance [32]           6,722            
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien                        
Principal amount or par value 6,992 [18],[21],[28]     6,992 [18],[21],[28]   5,756 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       5,728                
Fair Value, Ending Balance 6,878 [18],[28]     6,878 [18],[28]   5,728 [15],[29]            
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 128     128                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 126     126                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn 1                        
Principal amount or par value 384 [18],[19],[21],[22]     384 [18],[19],[21],[22]   512 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (3)                
Fair Value, Ending Balance (6) [18],[19],[22]     (6) [18],[19],[22]   (3) [15],[16],[27]            
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn 2                        
Principal amount or par value [15],[16],[26],[27]           1,279            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (6)                
Fair Value, Ending Balance [15],[16],[27]           (6)            
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 [15],[29]       3,599                
Fair Value, Ending Balance 3,599 [18],[28]     3,599 [18],[28]   3,599 [15],[29]            
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 [15],[16]       401                
Fair Value, Ending Balance 401 [18],[19]     401 [18],[19]   401 [15],[16]            
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Second lien                        
Principal amount or par value 5 [18],[19],[21]     5 [18],[19],[21]   5 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       0                
Fair Value, Ending Balance 0 [18],[19]     0 [18],[19]   0 [15],[16]            
Investment, Identifier [Axis]: Specialtycare, Inc., First lien                        
Principal amount or par value 10,485 [18],[21],[28]     10,485 [18],[21],[28]   7,224 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       7,115                
Fair Value, Ending Balance 10,175 [18],[28]     10,175 [18],[28]   7,115 [15],[29]            
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 79     79                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 77     77                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 1                        
Principal amount or par value 559 [18],[19],[21],[22]     559 [18],[19],[21],[22]   559 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (8)                
Fair Value, Ending Balance (16) [18],[19],[22]     (16) [18],[19],[22]   (8) [15],[16],[27]            
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 2                        
Principal amount or par value 868 [18],[19],[21],[22]     868 [18],[19],[21],[22]   671 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (10)                
Fair Value, Ending Balance (26) [18],[19],[22]     (26) [18],[19],[22]   (10) [15],[16],[27]            
Investment, Identifier [Axis]: Spring Education Group, Inc (fka SSH Group Holdings, Inc.), Second lien                        
Principal amount or par value [26],[29]           21,959            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       21,282                
Fair Value, Ending Balance [29]           21,282            
Investment, Identifier [Axis]: Stamps.com Inc., First lien                        
Principal amount or par value [15],[25],[26]           37,273            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       36,900                
Fair Value, Ending Balance [15],[25]           36,900            
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien                        
Principal amount or par value 3,995 [18],[21],[28]     3,995 [18],[21],[28]   4,025 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       3,985                
Fair Value, Ending Balance 3,955 [18],[28]     3,955 [18],[28]   3,985 [15],[29]            
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           1,585            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       1,570                
Fair Value, Ending Balance [15],[16],[27]           1,570            
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn 1                        
Principal amount or par value [18],[21],[22],[28] 2,135     2,135                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[28] 2,114     2,114                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn 2                        
Principal amount or par value [18],[19],[21],[22] 67     67                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 66     66                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 1                        
Principal amount or par value 492 [18],[19],[21],[22]     492 [18],[19],[21],[22]   559 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (6)                
Fair Value, Ending Balance (5) [18],[19],[22]     (5) [18],[19],[22]   (6) [15],[16],[27]            
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 2                        
Principal amount or par value 815 [18],[21],[22],[28]     815 [18],[21],[22],[28]   1,378 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (14)                
Fair Value, Ending Balance (8) [18],[22],[28]     $ (8) [18],[22],[28]   $ (14) [15],[16],[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 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[23] 11,467     $ 11,467                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred Shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 3,953     3,953                
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 [15],[32]       10,719                
Fair Value, Ending Balance [15],[32]           $ 10,719            
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 [15],[16]       3,695                
Fair Value, Ending Balance [15],[16]           3,695            
Investment, Identifier [Axis]: Syndigo LLC, Second lien                        
Principal amount or par value [26],[32]           22,500            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [32]       22,528                
Fair Value, Ending Balance [32]           22,528            
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                        
Principal amount or par value [18],[21],[23] 22,500     22,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[23] 21,281     21,281                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                        
Principal amount or par value [18],[21],[28] 5,697     5,697                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 5,388     5,388                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                        
Principal amount or par value [15],[26],[29]           16,563            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       13,968                
Fair Value, Ending Balance [15],[29]           13,968            
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                        
Principal amount or par value [18],[21],[28] 16,437     16,437                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 10,725     10,725                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                        
Principal amount or par value 15,853 [18],[21],[24]     15,853 [18],[21],[24]   15,975 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       13,473                
Fair Value, Ending Balance 10,344 [18],[24]     $ 10,344 [18],[24]   $ 13,473 [15],[25]            
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 [15],[16]       $ 114,934                
Fair Value, Ending Balance 118,768 [18],[19],[47]     118,768 [18],[19],[47]   $ 114,934 [15],[16]            
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien - Undrawn                        
Principal amount or par value 4,439 [18],[19],[21],[22]     4,439 [18],[19],[21],[22]   4,439 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27],[37]       (44)                
Fair Value, Ending Balance (44) [18],[19],[22],[38]     (44) [18],[19],[22],[38]   (44) [15],[16],[27],[37]            
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 1                        
Principal amount or par value 35,000 [18],[21],[28]     35,000 [18],[21],[28]   35,000 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       34,650                
Fair Value, Ending Balance 34,650 [18],[28]     34,650 [18],[28]   34,650 [15],[29]            
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 2                        
Principal amount or par value 24,189 [18],[21],[24]     24,189 [18],[21],[24]   24,189 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       23,947                
Fair Value, Ending Balance 23,947 [18],[24]     23,947 [18],[24]   23,947 [15],[25]            
Investment, Identifier [Axis]: Tenawa Resource Holdings LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[81]       0                
Fair Value, Ending Balance [15],[81]           0            
Investment, Identifier [Axis]: Tenawa Resource Holdings LLC, Profit Interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[82]       0                
Fair Value, Ending Balance [15],[82]           0            
Investment, Identifier [Axis]: Tenawa Resource Management LLC, First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27],[83]           8,000            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27],[83]       0                
Fair Value, Ending Balance [15],[16],[27],[83]           0            
Investment, Identifier [Axis]: Tenawa Resource Management LLC, First lien 1                        
Principal amount or par value [15],[16],[26]           31,624            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       18,821                
Fair Value, Ending Balance [15],[16]           18,821            
Investment, Identifier [Axis]: Tenawa Resource Management LLC, First lien 2                        
Principal amount or par value [15],[16],[26]           16,000            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       16,000                
Fair Value, Ending Balance [15],[16]           16,000            
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Drawn 1                        
Principal amount or par value           5,103       £ 3,771 [15],[16],[26],[27],[84]    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27],[84]       4,976                
Fair Value, Ending Balance [15],[16],[27],[84]           4,976            
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Drawn 2                        
Principal amount or par value [15],[16],[26],[27]           3,708            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       3,652                
Fair Value, Ending Balance [15],[16],[27]           3,652            
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Undrawn                        
Principal amount or par value           12,884       9,521 [15],[16],[26],[27],[84]    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27],[37],[84]       (143)                
Fair Value, Ending Balance [15],[16],[27],[37],[84]           (143)            
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                        
Principal amount or par value 14,386     14,386   17,428 £ 12,879 [18],[19],[21],[85]     £ 12,879 [15],[16],[26],[84]    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[84]       17,167                
Fair Value, Ending Balance 14,386 [18],[19],[85]     14,386 [18],[19],[85]   17,167 [15],[16],[84]            
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                        
Principal amount or par value           10,184 [15],[16],[26] £ 10,538 [18],[19],[21],[85]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       10,032                
Fair Value, Ending Balance 11,772 [18],[19],[85]     11,772 [18],[19],[85]   10,032 [15],[16]            
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2 and Tennessee Bidco Limited, First lien 5                        
Principal amount or par value 12,465     12,465                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                        
Principal amount or par value [18],[19],[21] 10,184     10,184                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 10,184     10,184                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                        
Principal amount or par value [18],[19],[21] 6,246     6,246                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 6,246     6,246                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                        
Principal amount or par value | € [18],[19],[21],[85]               € 708        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[85] 694     694                
Investment, Identifier [Axis]: The Kleinfelder Group, Inc., First lien                        
Principal amount or par value 16,576 [18],[21],[23]     16,576 [18],[21],[23]   16,708 [15],[26],[32]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[32]       16,708                
Fair Value, Ending Balance 16,428 [18],[23]     16,428 [18],[23]   16,708 [15],[32]            
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                        
Principal amount or par value [18],[21],[28] 29,868     29,868                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 29,570     29,570                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                        
Principal amount or par value [18],[21],[22],[28] 1,232     1,232                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[28] (12)     (12)                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                        
Principal amount or par value [18],[19],[21],[22] 4,267     4,267                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (43)     (43)                
Investment, Identifier [Axis]: Transcendia Holdings, Inc., Second lien                        
Principal amount or par value 14,500 [18],[21],[24]     14,500 [18],[21],[24]   14,500 [15],[25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       13,445                
Fair Value, Ending Balance 13,083 [18],[24]     13,083 [18],[24]   13,445 [15],[25]            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien                        
Principal amount or par value 15,382 [18],[21],[28]     15,382 [18],[21],[28]   15,382 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       15,228                
Fair Value, Ending Balance 15,257 [18],[28]     15,257 [18],[28]   15,228 [15],[29]            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                        
Principal amount or par value 2,889 [18],[21],[22],[28]     2,889 [18],[21],[22],[28]   1,201 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       1,189                
Fair Value, Ending Balance 2,865 [18],[22],[28]     2,865 [18],[22],[28]   1,189 [15],[16],[27]            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                        
Principal amount or par value 1,501 [18],[19],[21],[22]     1,501 [18],[19],[21],[22]   300 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (3)                
Fair Value, Ending Balance (12) [18],[19],[22]     (12) [18],[19],[22]   (3) [15],[16],[27]            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                        
Principal amount or par value 2,364 [18],[21],[22],[28]     2,364 [18],[21],[22],[28]   5,252 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       (53)                
Fair Value, Ending Balance (19) [18],[22],[28]     (19) [18],[22],[28]   (53) [15],[16],[27]            
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Drawn                        
Principal amount or par value [16],[26],[27]           15            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       15                
Fair Value, Ending Balance [16],[27]           15            
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                        
Principal amount or par value 893 [18],[19],[21],[22]     893 [18],[19],[21],[22]   878 [16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[27]       (9)                
Fair Value, Ending Balance (29) [18],[19],[22]     (29) [18],[19],[22]   (9) [16],[27]            
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                        
Principal amount or par value 11,340 [18],[21],[28]     11,340 [18],[21],[28]   11,426 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       11,311                
Fair Value, Ending Balance 10,972 [18],[28]     10,972 [18],[28]   11,311 [29]            
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                        
Principal amount or par value 1,476 [18],[19],[21]     1,476 [18],[19],[21]   1,488 [16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16]       1,473                
Fair Value, Ending Balance 1,429 [18],[19]     $ 1,429 [18],[19]   1,473 [16]            
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 12,805 [18],[21],[28]     $ 12,805 [18],[21],[28]   12,643 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       12,643                
Fair Value, Ending Balance 12,793 [18],[28]     12,793 [18],[28]   12,643 [15],[29]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 2                        
Principal amount or par value 9,480 [18],[19],[21]     9,480 [18],[19],[21]   9,363 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       9,363                
Fair Value, Ending Balance 9,472 [18],[19]     9,472 [18],[19]   9,363 [15],[16]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 3                        
Principal amount or par value 2,561 [18],[21],[28]     2,561 [18],[21],[28]   2,528 [15],[26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29]       2,528                
Fair Value, Ending Balance 2,558 [18],[28]     2,558 [18],[28]   2,528 [15],[29]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 4                        
Principal amount or par value 1,373 [18],[19],[21]     1,373 [18],[19],[21]   1,354 [15],[16],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       1,354                
Fair Value, Ending Balance 1,372 [18],[19]     1,372 [18],[19]   1,354 [15],[16]            
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 [15],[29]       0                
Fair Value, Ending Balance 0 [18],[28]     0 [18],[28]   0 [15],[29]            
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 [15],[16]       0                
Fair Value, Ending Balance 0 [18],[19]     0 [18],[19]   0 [15],[16]            
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 [15],[16],[86]       11,085                
Fair Value, Ending Balance 12,350 [18],[19],[87]     $ 12,350 [18],[19],[87]   $ 11,085 [15],[16],[86]            
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 [15],[16],[86]       $ 7,215                
Fair Value, Ending Balance 7,830 [18],[19],[87]     7,830 [18],[19],[87]   $ 7,215 [15],[16],[86]            
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 [15],[16],[71],[88]       396                
Fair Value, Ending Balance 2,194 [18],[19],[69],[89]     2,194 [18],[19],[69],[89]   $ 396 [15],[16],[71],[88]            
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 [15],[29],[71],[90]       0                
Fair Value, Ending Balance 0 [18],[28],[69],[91]     $ 0 [18],[28],[69],[91]   $ 0 [15],[29],[71],[90]            
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 [15],[16],[71],[90]       $ 0                
Fair Value, Ending Balance 0 [18],[19],[69],[91]     0 [18],[19],[69],[91]   $ 0 [15],[16],[71],[90]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien                        
Principal amount or par value [15],[16],[26]           9,970            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       9,970                
Fair Value, Ending Balance [15],[16]           9,970            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                        
Principal amount or par value [18],[19],[21] 11,148     11,148                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 10,385     10,385                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                        
Principal amount or par value [18],[19],[21] 4,942     4,942                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 4,604     4,604                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Senior preferred shares, Non-accrual status                        
Principal amount or par value   $ 19,795 $ 19,795   $ 19,795              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 2,194     2,194                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Warrants                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16]       13,081                
Fair Value, Ending Balance 29,595 [18],[19]     29,595 [18],[19]   13,081 [15],[16]            
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 1                        
Principal amount or par value 16,183 [18],[21],[28]     16,183 [18],[21],[28]   16,183 [26],[29]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29]       16,224                
Fair Value, Ending Balance 15,905 [18],[28]     15,905 [18],[28]   16,224 [29]            
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 2                        
Principal amount or par value 10,000 [18],[21],[23]     10,000 [18],[21],[23]   10,000 [26],[32]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [32]       10,025                
Fair Value, Ending Balance 9,828 [18],[23]     9,828 [18],[23]   10,025 [32]            
Investment, Identifier [Axis]: Vectra Co., Second lien                        
Principal amount or par value 10,788 [18],[21],[24]     10,788 [18],[21],[24]   10,788 [25],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [25]       10,586                
Fair Value, Ending Balance 8,787 [18],[24]     8,787 [18],[24]   10,586 [25]            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 1,255     1,255                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 1,255     1,255                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn 1                        
Principal amount or par value [15],[16],[26],[27]           9,390            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       9,390                
Fair Value, Ending Balance [15],[16],[27]           9,390            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn 2                        
Principal amount or par value [15],[16],[26],[27]           425            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       425                
Fair Value, Ending Balance [15],[16],[27]           425            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,040 [18],[19],[21],[22]     2,040 [18],[19],[21],[22]   678 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance 0 [18],[19],[22]     0 [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                        
Principal amount or par value [15],[16],[26],[27]           8,257            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 3                        
Principal amount or par value [18],[19],[21],[22] 14,550     14,550                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 0     0                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                        
Principal amount or par value [18],[21],[28] 18,988     18,988                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 18,988     18,988                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                        
Principal amount or par value [18],[21],[28] 1,257     1,257                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 1,257     1,257                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                        
Principal amount or par value [18],[21],[28] 843     843                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[28] 843     843                
Investment, Identifier [Axis]: Xactly Corporation, First lien                        
Principal amount or par value 19,047 [18],[21],[23]     19,047 [18],[21],[23]   19,047 [15],[26],[32]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[32]       19,047                
Fair Value, Ending Balance 19,047 [18],[23]     19,047 [18],[23]   19,047 [15],[32]            
Investment, Identifier [Axis]: Xactly Corporation, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 992     992                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 992     992                
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                        
Principal amount or par value [15],[16],[26],[27]           992            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance [15],[16],[27]           0            
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 1                        
Principal amount or par value [18],[19],[21],[22] 397     397                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 389     389                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 2                        
Principal amount or par value [18],[19],[21],[22] 240     240                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 236     236                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 1,838 [18],[21],[22],[41]     1,838 [18],[21],[22],[41]   2,078 [15],[26],[27],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[27],[42]       0                
Fair Value, Ending Balance (34) [18],[22],[41]     (34) [18],[22],[41]   0 [15],[27],[42]            
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 3,571 [18],[19],[21],[22]     3,571 [18],[19],[21],[22]   3,968 [15],[16],[26],[27]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       0                
Fair Value, Ending Balance (66) [18],[19],[22]     (66) [18],[19],[22]   0 [15],[16],[27]            
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 1                        
Principal amount or par value 17,907 [18],[21],[41]     17,907 [18],[21],[41]   18,045 [15],[26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42]       18,045                
Fair Value, Ending Balance 17,576 [18],[41]     17,576 [18],[41]   18,045 [15],[42]            
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 2                        
Principal amount or par value 2,332 [18],[21],[41]     2,332 [18],[21],[41]   2,350 [15],[26],[42]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42]       2,350                
Fair Value, Ending Balance 2,289 [18],[41]     2,289 [18],[41]   2,350 [15],[42]            
Investment, Identifier [Axis]: iCIMS, Inc., First lien                        
Principal amount or par value [18],[21],[24] 44,287     44,287                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[24] 43,901     43,901                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Drawn                        
Principal amount or par value [15],[16],[26],[27]           2,915            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[27]       2,915                
Fair Value, Ending Balance [15],[16],[27]           2,915            
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                        
Principal amount or par value [18],[21],[22],[24] 11,763     11,763                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[24] 0     0                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                        
Principal amount or par value [18],[19],[21],[22] 4,218     4,218                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] $ (37)     (37)                
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                        
Principal amount or par value [15],[25],[26]           41,636            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       41,636                
Fair Value, Ending Balance [15],[25]           41,636            
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                        
Principal amount or par value [15],[25],[26]           8,667            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[25]       $ 8,666                
Fair Value, Ending Balance [15],[25]           $ 8,666            
[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 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 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.
[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 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.
[9] 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.
[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 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.
[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] 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 September 30, 2022 and December 31, 2021, along with transactions during the nine months ended September 30, 2022 in which the issuer was a controlled investment, is as follows:
Portfolio Company (1)Fair Value at December 31, 2021Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at September 30, 2022Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
National HME, Inc./NHME Holdings Corp.$27,347 $3,075 $— $(23,401)$7,021 $— $1,575 $— $— 
New Benevis Topco, LLC / New Benevis Holdco, Inc.109,595 4,377 — (1,173)112,799 — 5,753 — 1,125 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.34,759 6,560 — 5,000 46,319 — 3,215 — 389 
NM APP CANADA CORP9,422 — — 2,198 11,620 — — 635 500 
NM APP US LLC14,891 — (5,080)(9,811)— 4,488 — 255 483 
NM CLFX LP24,676 — — (7,154)17,522 — — 1,169 — 
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 (9,318)8,977 — (9,318)— — — 
NM NL Holdings, L.P.107,870 52 (10,886)(1,680)95,356 — — 6,330 — 
NM GP Holdco, LLC1,197 — (137)(22)1,038 — — 73 — 
NM YI LLC8,286 — — 1,089 9,375 — — 621 — 
NMFC Senior Loan Program III LLC140,000 — — — 140,000 — — 12,935 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 9,520 — 
Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC 34,821 3,866 (5,628)40,010 73,069 — 4,717 — 1,381 
UniTek Global Services, Inc.67,635 11,378 (1,513)15,653 93,153 — 3,321 3,191 544 
Total Controlled Investments$755,810 $29,405 $(54,507)$(11,036)$719,672 $36,371 $18,581 $35,374 $7,235 
(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.
[14] Portfolio company moved into the controlled category from the non-controlled/non-affiliated investment category.
[15] 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.
[16] 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.
[17] 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.
[18] 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.
[19] 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.
[20] 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.
[21] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[22] 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.
[23] Investment is held in New Mountain Finance SBIC, L.P.
[24] 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.
[25] 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.
[26] Par amount is denominated in United States Dollar unless otherwise noted, British Pound ("£").
[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 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.
[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 and Wells Fargo Bank, National Association as the Administrative Agent and Collateral Custodian. See Note 7. Borrowings, for details.
[30] 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
[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] Investment is held in New Mountain Finance SBIC, L.P.
[33] Investment is held in NMF Ancora Holdings, Inc.
[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 11.0% 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 September 30, 2022, 16.2% 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 7.0% 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 10.5% 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] 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.
[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] 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.
[51] Investment is held in NMF HB, Inc
[52] 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.
[53] Investment is held in NMF HB, Inc.
[54] The Company holds preferred equity in HB Wealth Management, LLC that is entitled to receive cumulative preferential dividends at a rate of 4.0% per annum.
[55] Investment is held in NMF TRM, LLC.
[56] Investment is held in NMF QID NGL Holdings, Inc.
[57] The Company holds investments in multiple entities of Haven Midstream Holdings LLC. The Company holds 4.6% of the Class B profits interest in QID NGL, LLC (which at closing represented 97.0% of the ownership in the class B units in QID TRH Holdings, LLC), class A common units of Haven Midstream Holdings LLC, and holds a tranche A first lien term loan, a tranche B first lien term loan and a first lien revolver in Haven Midstream LLC.
[58] 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.
[59] 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.
[60] 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 wholly-owned subsidiary of NHME Holdings Corp.
[61] Investment is held in New Mountain Net Lease Corporation.
[62] Investment is held in New Mountain Net Lease Corporation.
[63] 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.
[64] 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.
[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] Investment is held in NMF OEC, Inc.
[68] 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 11.0% per annum.
[69] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[70] 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 $19,401 as of September 30, 2022. See Note 2. Summary of Significant Accounting Policies, for details.
[71] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[72] 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.
[73] Investment is held in NMF Permian Holdings, LLC.
[74] Investment is held in NMF Permian Holdings, LLC
[75] 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.
[76] 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.
[77] Investment is held in NMF Pioneer, Inc
[78] Investment is held in NMF Pioneer, Inc.
[79] 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.
[80] The Company holds preferred equity in Project Essential Super Parent, Inc. that is entitled to receive cumulative preferential dividends at a rate of L + 9.5% per annum.
[81] Investment is held in NMF TRM, LLC.
[82] Investment is held in NMF QID NGL Holdings, Inc.
[83] The Company holds investments in multiple entities of Tenawa Resource Holdings LLC. The Company holds 4.6% of the Class B profits interest in QID NGL, LLC (which at closing represented 97% of the ownership in the class B units in QID TRH Holdings, LLC), class A common units of Tenawa Resource Holdings LLC, and holds a tranche A first lien term loan, a tranche B first lien term loan and a first lien revolver in Tenawa Resource Management LLC.
[84] 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
[85] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of September 30, 2022, the par value U.S. dollar equivalent of the first lien term loan, and drawn first lien term loan is $14,386, and $12,465, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[86] 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.
[87] 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.
[88] 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.
[89] 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.
[90] 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.
[91] 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.