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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
investment
agreement
Dec. 31, 2022
USD ($)
agreement
investment
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
agreement
investment
Mar. 31, 2023
GBP (£)
investment
agreement
Mar. 31, 2023
EUR (€)
investment
agreement
Dec. 31, 2022
GBP (£)
agreement
investment
Dec. 31, 2022
EUR (€)
agreement
investment
Jun. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | agreement 1 1   1 1 1 1 1        
Cost basis of securities purchased under collateralized agreements to resell $ 30,000 $ 30,000   $ 30,000                
Fair value of securities purchased under collateralized agreements to resell 16,539 16,539   16,539                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [1] 3,221,247                      
Net Change In Unrealized Appreciation (Depreciation) 5,878   $ (10,355)                  
Fair Value, Ending Balance 3,270,326 [2] $ 3,221,247 [1]   $ 3,221,247 [1]                
Net Realized Gains (Losses) $ 677   19,517                  
Investments at fair value that are non-qualifying assets as a percentage of total assets 15.30% 15.30%   15.30% 15.30% 15.30% 15.30% 15.30%        
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 $ 4,462   4,638                  
NMFC Senior Loan Program IV LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Dividend Income 3,583   3,372                  
Non-controlled/Affiliated                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 130,787 [3]   134,775 $ 134,775                
Gross Additions 17,389 [4]     5,168 [5]                
Gross Redemptions (459) [6]     0 [7]                
Net Change In Unrealized Appreciation (Depreciation) (16)     (9,156)                
Fair Value, Ending Balance 147,701 [8] $ 130,787 [3]   130,787 [3]                
Net Realized Gains (Losses) 0     0                
Interest Income 700     2,105                
Dividend Income 1,105     4,109                
Other Income 63   63 250                
Non-controlled/Affiliated | Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 0                      
Gross Additions [4] 15,582                      
Gross Redemptions [6] (459)                      
Net Change In Unrealized Appreciation (Depreciation) (11)                      
Fair Value, Ending Balance 15,112 0   0                
Net Realized Gains (Losses) 0                      
Interest Income 4                      
Dividend Income 0                      
Other Income 0                      
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   0 0                
Gross Additions 0 [4]     0 [5]                
Gross Redemptions 0 [6]     0 [7]                
Net Change In Unrealized Appreciation (Depreciation) 0     0                
Fair Value, Ending Balance 0 0   0                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 0     0                
Other Income 0     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   4,000 4,000                
Gross Additions 0 [4]     0 [5]                
Gross Redemptions 0 [6]     0 [7]                
Net Change In Unrealized Appreciation (Depreciation) 0     0                
Fair Value, Ending Balance 4,000 4,000   4,000                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 0     0                
Other Income 0     0                
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 126,787   130,775 130,775                
Gross Additions 1,807 [4]     5,168 [5]                
Gross Redemptions 0 [6]     0 [7]                
Net Change In Unrealized Appreciation (Depreciation) (5)     (9,156)                
Fair Value, Ending Balance 128,589 126,787   126,787                
Net Realized Gains (Losses) 0     0                
Interest Income 696     2,105                
Dividend Income 1,105     4,109                
Other Income 63     250                
Controlled                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 690,035 [9]   755,810 755,810                
Gross Additions 14,110 [10]     22,952 [11]                
Gross Redemptions (43,849) [12]     (94,946) [13]                
Net Change In Unrealized Appreciation (Depreciation) 8,797     6,219                
Fair Value, Ending Balance 669,091 [14] 690,035 [9]   690,035 [9]                
Net Realized Gains (Losses) 1,973     53,440                
Interest Income 5,832     13,954                
Dividend Income 12,225     47,512                
Other Income 1,195   2,619 7,146                
Controlled | Edmentum Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 0   0 0                
Gross Additions [11]       0                
Gross Redemptions [13]       0                
Net Change In Unrealized Appreciation (Depreciation)       0                
Fair Value, Ending Balance   0   0                
Net Realized Gains (Losses)       54                
Interest Income       0                
Dividend Income       0                
Other Income       0                
Controlled | National HME, Inc./NHME Holdings Corp.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 5,381   27,347 27,347                
Gross Additions 0 [10]     (8,161) [11]                
Gross Redemptions (17,404) [12]     0 [13]                
Net Change In Unrealized Appreciation (Depreciation) 17,023     (13,805)                
Fair Value, Ending Balance 5,000 5,381   5,381                
Net Realized Gains (Losses) (17,404)     0                
Interest Income 0     (9,661)                
Dividend Income 0     0                
Other Income 0     (1,500)                
Controlled | New Benevis Topco, LLC / New Benevis Holdco, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 114,146   109,595 109,595                
Gross Additions 10,235 [10]     5,914 [11]                
Gross Redemptions 0 [12]     0 [13]                
Net Change In Unrealized Appreciation (Depreciation) (320)     (1,363)                
Fair Value, Ending Balance 124,061 114,146   114,146                
Net Realized Gains (Losses) 0     0                
Interest Income 2,563     8,057                
Dividend Income 0     0                
Other Income 375     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 57,564   34,759 34,759                
Gross Additions 1,312 [10]     7,805 [11]                
Gross Redemptions 0 [12]     0 [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     15,000                
Fair Value, Ending Balance 58,876 57,564   57,564                
Net Realized Gains (Losses) 0     0                
Interest Income 1,333     4,504                
Dividend Income 0     0                
Other Income 129     511                
Controlled | NM APP CANADA CORP                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 0   9,422 9,422                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     (7,345) [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     (2,077)                
Fair Value, Ending Balance 0 0   0                
Net Realized Gains (Losses) 0     4,212                
Interest Income 0     0                
Dividend Income 0     620                
Other Income 0     713                
Controlled | NM APP US LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 0   14,891 14,891                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     (5,080) [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     (9,811)                
Fair Value, Ending Balance 0 0   0                
Net Realized Gains (Losses) 0     4,489                
Interest Income 0     0                
Dividend Income 0     255                
Other Income 0     483                
Controlled | NM CLFX LP                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 16,172   24,676 24,676                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     0 [13]                
Net Change In Unrealized Appreciation (Depreciation) (735)     (8,504)                
Fair Value, Ending Balance 15,437 16,172   16,172                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 393     1,596                
Other Income 0     0                
Controlled | NM DRVT LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 0   7,984 7,984                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     (5,152) [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     (2,832)                
Fair Value, Ending Balance 0 0   0                
Net Realized Gains (Losses) 0     3,439                
Interest Income 0     0                
Dividend Income 0     173                
Other Income 0     475                
Controlled | NM JRA LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 0   3,996 3,996                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     (2,043) [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     (1,953)                
Fair Value, Ending Balance 0 0   0                
Net Realized Gains (Losses) 0     2,049                
Interest Income 0     0                
Dividend Income 0     72                
Other Income 0     188                
Controlled | NM GLCR LP                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 0   50,687 50,687                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     (14,750) [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     (35,937)                
Fair Value, Ending Balance 0 0   0                
Net Realized Gains (Losses) 0     35,713                
Interest Income 0     0                
Dividend Income 0     400                
Other Income 0     2,150                
Controlled | NM KRLN LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 0   244 244                
Gross Additions 0 [10]     97 [11]                
Gross Redemptions 0 [12]     (9,319) [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     8,978                
Fair Value, Ending Balance 0 0   0                
Net Realized Gains (Losses) 0     (9,318)                
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 94,305   107,870 107,870                
Gross Additions 0 [10]     53 [11]                
Gross Redemptions 0 [12]     (10,885) [13]                
Net Change In Unrealized Appreciation (Depreciation) 271     (2,733)                
Fair Value, Ending Balance 94,576 94,305   94,305                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 2,318     8,453                
Other Income 0     0                
Controlled | NM GP Holdco, LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 1,028   1,197 1,197                
Gross Additions 0 [10]     1 [11]                
Gross Redemptions 0 [12]     (138) [13]                
Net Change In Unrealized Appreciation (Depreciation) 1     (32)                
Fair Value, Ending Balance 1,029 1,028   1,028                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 26     94                
Other Income 0     0                
Controlled | NM YI LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 9,481   8,286 8,286                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     0 [13]                
Net Change In Unrealized Appreciation (Depreciation) 100     1,195                
Fair Value, Ending Balance 9,581 9,481   9,481                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 214     828                
Other Income 0     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   140,000 140,000                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     0 [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     0                
Fair Value, Ending Balance 140,000 140,000   140,000                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 4,462     17,485                
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   112,400 112,400                
Gross Additions 0 [10]     0 [11]                
Gross Redemptions 0 [12]     0 [13]                
Net Change In Unrealized Appreciation (Depreciation) 0     0                
Fair Value, Ending Balance 112,400 112,400   112,400                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 3,583     13,173                
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 35,788   34,821 34,821                
Gross Additions 0 [10]     3,865 [11]                
Gross Redemptions 0 [12]     (38,685) [13]                
Net Change In Unrealized Appreciation (Depreciation) (19,397)     35,787                
Fair Value, Ending Balance 16,391 35,788   35,788                
Net Realized Gains (Losses) 19,375     12,802                
Interest Income 0     6,316                
Dividend Income 0     0                
Other Income 510     1,902                
Controlled | UniTek Global Services, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance 103,770   $ 67,635 67,635                
Gross Additions 2,563 [10]     13,378 [11]                
Gross Redemptions (26,445) [12]     (1,549) [13]                
Net Change In Unrealized Appreciation (Depreciation) 11,854     24,306                
Fair Value, Ending Balance 91,740 103,770   103,770                
Net Realized Gains (Losses) 2     0                
Interest Income 1,936     4,738                
Dividend Income 1,229     4,363                
Other Income 181     724                
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] 0 [15],[16],[17]   0 [15],[16],[17]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 1                        
Principal amount or par value 17,078 [18],[20],[21],[22] 12,357 [15],[16],[23],[24]   12,357 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 12,204                      
Fair Value, Ending Balance 17,019 [18],[20],[22] 12,204 [15],[16],[24]   12,204 [15],[16],[24]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 2                        
Principal amount or par value 5,541 [18],[21],[22],[25] 4,009 [15],[23],[24],[26]   4,009 [15],[23],[24],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[26] 3,959                      
Fair Value, Ending Balance 5,521 [18],[22],[25] 3,959 [15],[24],[26]   3,959 [15],[24],[26]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                        
Principal amount or par value [15],[23],[24],[26]   4,231   4,231                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[26] (52)                      
Fair Value, Ending Balance [15],[24],[26]   (52)   (52)                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,689 [18],[21],[22],[25] 3,659 [15],[16],[23],[24]   3,659 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (45)                      
Fair Value, Ending Balance (9) [18],[22],[25] (45) [15],[16],[24]   (45) [15],[16],[24]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 2                        
Principal amount or par value 3,659 [18],[19],[21],[22] 13,041 [15],[16],[23],[24]   13,041 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (162)                      
Fair Value, Ending Balance (13) [18],[19],[22] (162) [15],[16],[24]   (162) [15],[16],[24]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 3                        
Principal amount or par value [18],[20],[21],[22] 8,289                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[20],[22] (29)                      
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                        
Principal amount or par value 20,582 [18],[21],[27] 20,634 [15],[23],[28]   20,634 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 20,378                      
Fair Value, Ending Balance 20,509 [18],[27] 20,378 [15],[28]   20,378 [15],[28]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                        
Principal amount or par value 9,772 [18],[21],[25] 9,797 [15],[23],[26]   9,797 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 9,676                      
Fair Value, Ending Balance 9,738 [18],[25] 9,676 [15],[26]   9,676 [15],[26]                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                        
Principal amount or par value 12,857 [18],[19],[21] 12,494 [15],[16],[23]   12,494 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 11,908                      
Fair Value, Ending Balance 12,361 [18],[19] 11,908 [15],[16]   11,908 [15],[16]                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                        
Principal amount or par value 5,042 [18],[21],[25] 4,900 [15],[23],[26]   4,900 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 4,670                      
Fair Value, Ending Balance 4,848 [18],[25] 4,670 [15],[26]   4,670 [15],[26]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien                        
Principal amount or par value 22,096 [18],[20],[21] 22,082 [15],[23],[29]   22,082 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 21,338                      
Fair Value, Ending Balance 21,248 [18],[20] 21,338 [15],[29]   21,338 [15],[29]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 3,361                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 3,232                      
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 1                        
Principal amount or par value [15],[16],[23],[24]   2,840   2,840                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 2,744                      
Fair Value, Ending Balance [15],[16],[24]   2,744   2,744                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 2                        
Principal amount or par value [15],[16],[23],[24]   259   259                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 250                      
Fair Value, Ending Balance [15],[16],[24]   250   250                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 2,354 [18],[19],[21],[22] 2,095 [15],[16],[23],[24]   2,095 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (71)                      
Fair Value, Ending Balance (90) [18],[19],[22] (71) [15],[16],[24]   (71) [15],[16],[24]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 4,865 [18],[19],[21],[22] 5,386 [15],[16],[23],[24]   5,386 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (181)                      
Fair Value, Ending Balance $ (187) [18],[19],[22] (181) [15],[16],[24]   $ (181) [15],[16],[24]                
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] $ 14,068                      
Fair Value, Ending Balance 14,082 [18],[19],[31] 14,068 [15],[16],[30]   $ 14,068 [15],[16],[30]                
Investment, Identifier [Axis]: ADG, LLC, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 375                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 349                      
Investment, Identifier [Axis]: ADG, LLC, First lien - Undrawn                        
Principal amount or par value [18],[19],[21],[22] 307                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (21)                      
Investment, Identifier [Axis]: ADG, LLC, Second lien                        
Principal amount or par value 7,430 [18],[19],[21] 7,430 [15],[16],[23]   7,430 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 4,984                      
Fair Value, Ending Balance 2,667 [18],[19] 4,984 [15],[16]   4,984 [15],[16]                
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                        
Principal amount or par value 13,444 [18],[21],[27] 13,444 [15],[23],[28]   13,444 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 13,444                      
Fair Value, Ending Balance 13,444 [18],[27] 13,444 [15],[28]   13,444 [15],[28]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 303                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 300                      
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 1                        
Principal amount or par value 1,969 [18],[19],[21],[22] 1,969 [15],[16],[23],[24]   1,969 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (39)                      
Fair Value, Ending Balance (19) [18],[19],[22] (39) [15],[16],[24]   (39) [15],[16],[24]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 2                        
Principal amount or par value 11,414 [18],[19],[21],[22] 11,718 [15],[16],[23],[24]   11,718 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (234)                      
Fair Value, Ending Balance (107) [18],[19],[22] (234) [15],[16],[24]   (234) [15],[16],[24]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                        
Principal amount or par value 22,265 [18],[20],[21] 22,321 [15],[23],[29]   22,321 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 21,875                      
Fair Value, Ending Balance 22,056 [18],[20] 21,875 [15],[29]   21,875 [15],[29]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                        
Principal amount or par value 4,014 [18],[20],[21] 4,024 [15],[23],[29]   4,024 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 3,943                      
Fair Value, Ending Balance 3,976 [18],[20] 3,943 [15],[29]   3,943 [15],[29]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                        
Principal amount or par value 30,778                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                        
Principal amount or par value 2,652 [18],[19],[21],[22] 2,652 [15],[16],[23],[24]   2,652 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[17],[24] 0                      
Fair Value, Ending Balance 0 [18],[19],[22],[32] 0 [15],[16],[17],[24]   0 [15],[16],[17],[24]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                        
Principal amount or par value 29,251 [18],[20],[21] 28,829 [15],[23],[29]   28,829 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 20,599                      
Fair Value, Ending Balance 21,847 [18],[20] 20,599 [15],[29]   20,599 [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 [15],[16],[23]   1,527 [15],[16],[23]                
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 [15],[16]   0 [15],[16]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                        
Principal amount or par value                   $ 13,227    
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 8,739                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                        
Principal amount or par value 5,230 [18],[19],[21] 5,230 [15],[16],[23]   5,230 [15],[16],[23]                
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 [15],[16]   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]: Anaplan, Inc., First lien                        
Principal amount or par value 33,618 [18],[20],[21] 33,618 [15],[23],[29]   33,618 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 33,282                      
Fair Value, Ending Balance 33,282 [18],[20] 33,282 [15],[29]   33,282 [15],[29]                
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 [15],[33]   158 [15],[33]                
Investment, Identifier [Axis]: Ansira Holdings, Inc, First lien - Undrawn                        
Principal amount or par value [15],[16],[23],[24]   1,161   1,161                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance [15],[16],[24]   0   0                
Investment, Identifier [Axis]: Ansira Holdings, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 9,211                      
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien - Drawn                        
Principal amount or par value 341 [18],[19],[21],[22] 313 [15],[16],[23],[24]   313 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 313                      
Fair Value, Ending Balance 341 [18],[19],[22] 313 [15],[16],[24]   313 [15],[16],[24]                
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien - Undrawn                        
Principal amount or par value [18],[19],[21],[22] 1,161                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 0                      
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 1                        
Principal amount or par value 32,881 [18],[19],[21] 32,953 [15],[23],[28]   32,953 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 14,829                      
Fair Value, Ending Balance 7,355 [18],[19] 14,829 [15],[28]   14,829 [15],[28]                
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 2                        
Principal amount or par value 8,298 [18],[19],[21] 8,316 [15],[16],[23]   8,316 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 3,742                      
Fair Value, Ending Balance $ 1,856 [18],[19] $ 3,742 [15],[16]   $ 3,742 [15],[16]                
Investment, Identifier [Axis]: Appriss Health Holdings, Inc, Wholly-owned subsidiaries                        
Number of investments held | investment 2 2   2 2 2 2 2        
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc., Preferred shares                        
Preferred equity dividend rate 11.00%     11.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] $ 2,628                      
Fair Value, Ending Balance 2,626 [18],[19],[35] $ 2,628 [15],[16]   $ 2,628 [15],[16]                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien                        
Principal amount or par value 6,227 [18],[21],[27] 6,234 [15],[23],[28]   6,234 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28],[36] 6,234                      
Fair Value, Ending Balance 6,108 [18],[27] 6,234 [15],[28],[36]   6,234 [15],[28],[36]                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 208                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 204                      
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                        
Principal amount or par value 208 [18],[19],[21],[22] 417 [15],[16],[23],[24]   417 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24],[36] 0                      
Fair Value, Ending Balance (4) [18],[19],[22],[35] 0 [15],[16],[24],[36]   0 [15],[16],[24],[36]                
Investment, Identifier [Axis]: Apptio, Inc., First lien - Drawn                        
Principal amount or par value 1,860 [18],[19],[21],[22] 1,240 [15],[16],[23],[24]   1,240 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 1,240                      
Fair Value, Ending Balance 1,860 [18],[19],[22] 1,240 [15],[16],[24]   1,240 [15],[16],[24]                
Investment, Identifier [Axis]: Apptio, Inc., First lien - Undrawn                        
Principal amount or par value 207 [18],[19],[21],[22] 827 [15],[16],[23],[24]   827 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Apptio, Inc., First lien 1                        
Principal amount or par value 5,703 [18],[21],[27] 5,703 [15],[23],[28]   5,703 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 5,703                      
Fair Value, Ending Balance 5,703 [18],[27] 5,703 [15],[28]   5,703 [15],[28]                
Investment, Identifier [Axis]: Apptio, Inc., First lien 2                        
Principal amount or par value 5,500 [18],[20],[21] 5,500 [15],[23],[29]   5,500 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 5,500                      
Fair Value, Ending Balance 5,500 [18],[20] 5,500 [15],[29]   5,500 [15],[29]                
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                        
Principal amount or par value 3,543 [18],[19],[21],[22] 3,543 [15],[16],[23],[24]   3,543 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Associations, Inc., First lien 1                        
Principal amount or par value 36,014 [18],[20],[21] 35,786 [15],[23],[29]   35,786 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 35,786                      
Fair Value, Ending Balance 36,014 [18],[20] 35,786 [15],[29]   35,786 [15],[29]                
Investment, Identifier [Axis]: Associations, Inc., First lien 2                        
Principal amount or par value 8,865 [18],[21],[27] 8,810 [15],[23],[28]   8,810 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 8,810                      
Fair Value, Ending Balance 8,865 [18],[27] 8,810 [15],[28]   8,810 [15],[28]                
Investment, Identifier [Axis]: Associations, Inc., First lien 3                        
Principal amount or par value 8,865 [18],[20],[21] 8,810 [15],[23],[29]   8,810 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 8,810                      
Fair Value, Ending Balance 8,865 [18],[20] 8,810 [15],[29]   8,810 [15],[29]                
Investment, Identifier [Axis]: Associations, Inc., First lien 4                        
Principal amount or par value 5,355 [18],[21],[27] 5,321 [15],[23],[28]   5,321 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 5,321                      
Fair Value, Ending Balance 5,355 [18],[27] 5,321 [15],[28]   5,321 [15],[28]                
Investment, Identifier [Axis]: Associations, Inc., First lien 5                        
Principal amount or par value 4,260 [18],[21],[27] 4,233 [15],[23],[28]   4,233 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 4,233                      
Fair Value, Ending Balance 4,260 [18],[27] 4,233 [15],[28]   4,233 [15],[28]                
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                        
Principal amount or par value 34,459 [18],[21],[27] 34,459 [15],[23],[28]   34,459 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28],[37] 34,356                      
Fair Value, Ending Balance 34,459 [18],[27],[38] 34,356 [15],[28],[37]   34,356 [15],[28],[37]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien                        
Principal amount or par value 3,454 [18],[20],[21] 3,454 [23],[29]   3,454 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29],[37] 3,402                      
Fair Value, Ending Balance 3,402 [18],[20],[38] 3,402 [29],[37]   3,402 [29],[37]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                        
Principal amount or par value 320 [18],[19],[21],[22] 320 [16],[23],[24]   320 [16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[24],[37] (5)                      
Fair Value, Ending Balance (5) [18],[19],[22],[38] (5) [16],[24],[37]   (5) [16],[24],[37]                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                        
Principal amount or par value [15],[23],[28]   22,069   22,069                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 21,694                      
Fair Value, Ending Balance [15],[28]   21,694   21,694                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                        
Principal amount or par value [15],[23],[29]   14,925   14,925                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 14,671                      
Fair Value, Ending Balance [15],[29]   14,671   14,671                
Investment, Identifier [Axis]: Auctane, Inc. (fka Stamps.com Inc.), First lien 1                        
Principal amount or par value [18],[21],[27] 22,013                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[27] 21,890                      
Investment, Identifier [Axis]: Auctane, Inc. (fka Stamps.com Inc.), First lien 2                        
Principal amount or par value [18],[20],[21] 14,887                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[20] 14,804                      
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                        
Principal amount or par value 3,538 [18],[19],[21],[22] 3,538 [15],[16],[23],[24]   3,538 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (30)                      
Fair Value, Ending Balance (4) [18],[19],[22] (30) [15],[16],[24]   (30) [15],[16],[24]                
Investment, Identifier [Axis]: Avalara, Inc., First lien 1                        
Principal amount or par value 22,500 [18],[21],[27] 22,500 [15],[23],[28]   22,500 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 22,307                      
Fair Value, Ending Balance 22,473 [18],[27] 22,307 [15],[28]   22,307 [15],[28]                
Investment, Identifier [Axis]: Avalara, Inc., First lien 2                        
Principal amount or par value 12,880 [18],[20],[21] 12,880 [15],[23],[29]   12,880 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 12,769                      
Fair Value, Ending Balance $ 12,865 [18],[20] 12,769 [15],[29]   $ 12,769 [15],[29]                
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                        
Preferred equity dividend rate 12.25%     12.25%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[37],[39] $ 10,748                      
Fair Value, Ending Balance 11,028 [18],[19],[38],[40] 10,748 [15],[16],[37],[39]   $ 10,748 [15],[16],[37],[39]                
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Drawn                        
Principal amount or par value 606 [18],[19],[21],[22] 1,212 [15],[16],[23],[24]   1,212 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 1,177                      
Fair Value, Ending Balance 595 [18],[19],[22] 1,177 [15],[16],[24]   1,177 [15],[16],[24]                
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Undrawn                        
Principal amount or par value 909 [18],[19],[21],[22] 303 [15],[16],[23],[24]   303 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (9)                      
Fair Value, Ending Balance (16) [18],[19],[22] (9) [15],[16],[24]   (9) [15],[16],[24]                
Investment, Identifier [Axis]: Bluefin Holding, LLC, Second lien                        
Principal amount or par value 18,000 [18],[21],[27] 18,000 [15],[23],[28]   18,000 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 17,338                      
Fair Value, Ending Balance 17,559 [18],[27] 17,338 [15],[28]   17,338 [15],[28]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 1                        
Principal amount or par value 22,500 [18],[21],[41] 22,500 [15],[23],[42]   22,500 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 21,798                      
Fair Value, Ending Balance 21,798 [18],[41] 21,798 [15],[42]   21,798 [15],[42]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 2                        
Principal amount or par value 16,624 [18],[20],[21] 16,624 [15],[23],[29]   16,624 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 16,104                      
Fair Value, Ending Balance 16,104 [18],[20] 16,104 [15],[29]   16,104 [15],[29]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 3                        
Principal amount or par value 6,000 [18],[21],[27] 6,000 [15],[23],[28]   6,000 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 5,813                      
Fair Value, Ending Balance 5,812 [18],[27] 5,813 [15],[28]   5,813 [15],[28]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                        
Principal amount or par value [15],[16],[23],[24]   392   392                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 392                      
Fair Value, Ending Balance [15],[16],[24]   392   392                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                        
Principal amount or par value 852 [18],[19],[21],[22] 460 [15],[16],[23],[24]   460 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                        
Principal amount or par value 16,616 [18],[20],[21] 16,659 [15],[23],[29]   16,659 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 16,659                      
Fair Value, Ending Balance 16,616 [18],[20] 16,659 [15],[29]   16,659 [15],[29]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                        
Principal amount or par value 3,433 [18],[20],[21] 3,442 [15],[23],[29]   3,442 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 3,442                      
Fair Value, Ending Balance 3,433 [18],[20] 3,442 [15],[29]   3,442 [15],[29]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                        
Principal amount or par value 769 [18],[20],[21] 771 [15],[23],[29]   771 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 771                      
Fair Value, Ending Balance 769 [18],[20] 771 [15],[29]   771 [15],[29]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                        
Principal amount or par value 345 [18],[20],[21] 345 [15],[23],[29]   345 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 345                      
Fair Value, Ending Balance 345 [18],[20] 345 [15],[29]   345 [15],[29]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                        
Principal amount or par value 275 [18],[20],[21] 275 [15],[23],[29]   275 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 275                      
Fair Value, Ending Balance 275 [18],[20] 275 [15],[29]   275 [15],[29]                
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                        
Principal amount or par value 11,210 [18],[20],[21] 11,392 [15],[23],[29]   11,392 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 10,637                      
Fair Value, Ending Balance 10,618 [18],[20] 10,637 [15],[29]   10,637 [15],[29]                
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                        
Principal amount or par value 3,339 [18],[20],[21] 3,393 [15],[23],[29]   3,393 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 3,168                      
Fair Value, Ending Balance 3,163 [18],[20] 3,168 [15],[29]   3,168 [15],[29]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                        
Principal amount or par value 8,339 [18],[20],[21] 8,317 [15],[23],[29]   8,317 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 7,411                      
Fair Value, Ending Balance 7,379 [18],[20] 7,411 [15],[29]   7,411 [15],[29]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                        
Principal amount or par value 921 [18],[19],[21],[22] 916 [15],[16],[23],[24]   916 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 817                      
Fair Value, Ending Balance 815 [18],[19],[22] 817 [15],[16],[24]   817 [15],[16],[24]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                        
Principal amount or par value 226 [18],[19],[21],[22] 226 [15],[16],[23],[24]   226 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (25)                      
Fair Value, Ending Balance (26) [18],[19],[22] (25) [15],[16],[24]   (25) [15],[16],[24]                
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 1                        
Principal amount or par value 7,012 [18],[21],[25] 7,012 [15],[23],[26]   7,012 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 6,923                      
Fair Value, Ending Balance 7,012 [18],[25] 6,923 [15],[26]   6,923 [15],[26]                
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 2                        
Principal amount or par value 4,453 [18],[19],[21] 4,453 [15],[16],[23]   4,453 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 4,396                      
Fair Value, Ending Balance 4,453 [18],[19] 4,396 [15],[16]   4,396 [15],[16]                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 1                        
Principal amount or par value 18,266 [18],[19],[21] 18,266 [15],[16],[23]   18,266 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 17,409                      
Fair Value, Ending Balance 17,420 [18],[19] 17,409 [15],[16]   17,409 [15],[16]                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 2                        
Principal amount or par value 7,500 [18],[21],[27] 7,500 [15],[23],[28]   7,500 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 7,148                      
Fair Value, Ending Balance 7,153 [18],[27] 7,148 [15],[28]   7,148 [15],[28]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien                        
Principal amount or par value 12,347 [18],[21],[41] 12,347 [15],[23],[42]   12,347 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 12,347                      
Fair Value, Ending Balance 11,890 [18],[41] 12,347 [15],[42]   12,347 [15],[42]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                        
Principal amount or par value 850 [18],[19],[21],[22] 850 [15],[16],[23],[24]   850 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 850                      
Fair Value, Ending Balance 818 [18],[19],[22] 850 [15],[16],[24]   850 [15],[16],[24]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                        
Principal amount or par value 637 [18],[19],[21],[22] 637 [15],[16],[23],[24]   637 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance (24) [18],[19],[22] 0 [15],[16],[24]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                        
Principal amount or par value 11,944 [18],[21],[25] 11,974 [15],[23],[26]   11,974 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 11,490                      
Fair Value, Ending Balance 11,136 [18],[25] 11,490 [15],[26]   11,490 [15],[26]                
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                        
Principal amount or par value 9,767 [18],[21],[25] 9,767 [15],[23],[26]   9,767 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 9,432                      
Fair Value, Ending Balance 9,439 [18],[25] 9,432 [15],[26]   9,432 [15],[26]                
Investment, Identifier [Axis]: Castle Management Borrower LLC, First lien                        
Principal amount or par value 14,136 [18],[21],[27] 14,288 [15],[23],[28]   14,288 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 13,605                      
Fair Value, Ending Balance 13,945 [18],[27] 13,605 [15],[28]   13,605 [15],[28]                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 1                        
Principal amount or par value 47,838 [19],[21] 47,838 [16],[23]   47,838 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16] 40,941                      
Fair Value, Ending Balance 41,380 [19] 40,941 [16]   40,941 [16]                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 2                        
Principal amount or par value 7,500 [21],[27] 7,500 [23],[28]   7,500 [23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [28] 6,419                      
Fair Value, Ending Balance 6,488 [27] 6,419 [28]   6,419 [28]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien                        
Principal amount or par value 7,145 [18],[20],[21] 7,163 [15],[23],[29]   7,163 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 6,928                      
Fair Value, Ending Balance 7,003 [18],[20] 6,928 [15],[29]   6,928 [15],[29]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                        
Principal amount or par value 425 [18],[19],[21],[22] 425 [15],[16],[23],[24]   425 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (14)                      
Fair Value, Ending Balance (8) [18],[19],[22] (14) [15],[16],[24]   (14) [15],[16],[24]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                        
Principal amount or par value 849 [18],[19],[21],[22] 849 [15],[16],[23],[24]   849 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (28)                      
Fair Value, Ending Balance (17) [18],[19],[22] (28) [15],[16],[24]   (28) [15],[16],[24]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                        
Principal amount or par value 19,167 [18],[21],[25] 19,215 [15],[23],[26]   19,215 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 18,639                      
Fair Value, Ending Balance 19,168 [18],[25] 18,639 [15],[26]   18,639 [15],[26]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                        
Principal amount or par value 3,200 [18],[21],[25] 3,208 [15],[23],[26]   3,208 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 3,112                      
Fair Value, Ending Balance 3,200 [18],[25] 3,112 [15],[26]   3,112 [15],[26]                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                        
Principal amount or par value [18],[19],[21],[22] 1,291                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (11)                      
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                        
Principal amount or par value [18],[19],[21],[22] 989                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (9)                      
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 1                        
Principal amount or par value [18],[20],[21] 7,230                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[20] 7,167                      
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 2                        
Principal amount or par value [18],[21],[27] 7,230                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[27] 7,167                      
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                        
Principal amount or par value 1,013 [18],[19],[21],[22] 1,013 [15],[16],[23],[24]   1,013 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 1                        
Principal amount or par value 13,760 [18],[21],[41] 13,795 [15],[23],[42]   13,795 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 13,795                      
Fair Value, Ending Balance 13,760 [18],[41] 13,795 [15],[42]   13,795 [15],[42]                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 2                        
Principal amount or par value 2,476 [18],[21],[41] 2,482 [15],[23],[42]   2,482 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 2,482                      
Fair Value, Ending Balance 2,476 [18],[41] 2,482 [15],[42]   2,482 [15],[42]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Drawn                        
Principal amount or par value 1,038 [18],[19],[21],[22] 2,836 [15],[16],[23],[24]   2,836 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 2,781                      
Fair Value, Ending Balance 1,028 [18],[19],[22] 2,781 [15],[16],[24]   2,781 [15],[16],[24]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn                        
Principal amount or par value [18],[19],[21],[22] 2,898                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (26)                      
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 1                        
Principal amount or par value [15],[16],[23],[24]   450   450                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (9)                      
Fair Value, Ending Balance [15],[16],[24]   (9)   (9)                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 2                        
Principal amount or par value [16],[23],[24]   3,936   3,936                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16],[24] (59)                      
Fair Value, Ending Balance [16],[24]   (59)   (59)                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                        
Principal amount or par value 19,605 [18],[20],[21] 19,660 [15],[23],[29]   19,660 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 19,278                      
Fair Value, Ending Balance 19,238 [18],[20] 19,278 [15],[29]   19,278 [15],[29]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                        
Principal amount or par value 10,293 [18],[20],[21] 7,046 [15],[23],[29]   7,046 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 6,909                      
Fair Value, Ending Balance 10,100 [18],[20] 6,909 [15],[29]   6,909 [15],[29]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 3                        
Principal amount or par value 3,278 [18],[20],[21] 3,273 [15],[16],[23]   3,273 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 3,209                      
Fair Value, Ending Balance 3,216 [18],[20] 3,209 [15],[16]   3,209 [15],[16]                
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                        
Principal amount or par value 20,313 [19],[21] 20,313 [16],[23]   20,313 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16] 18,053                      
Fair Value, Ending Balance 17,983 [19] 18,053 [16]   18,053 [16]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                        
Principal amount or par value [15],[23],[24],[26]   2,457   2,457                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[26] (67)                      
Fair Value, Ending Balance [15],[24],[26]   (67)   (67)                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,405 [18],[19],[21],[22] 2,405 [15],[16],[23],[24]   2,405 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (66)                      
Fair Value, Ending Balance (21) [18],[19],[22] (66) [15],[16],[24]   (66) [15],[16],[24]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 2                        
Principal amount or par value 2,457 [18],[21],[22],[25] 6,561 [15],[16],[23],[24]   6,561 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (180)                      
Fair Value, Ending Balance (22) [18],[22],[25] (180) [15],[16],[24]   (180) [15],[16],[24]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 3                        
Principal amount or par value [18],[19],[21],[22] 6,561                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (58)                      
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                        
Principal amount or par value 18,666 [18],[21],[27] 18,760 [15],[23],[28]   18,760 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 18,246                      
Fair Value, Ending Balance 18,502 [18],[27] 18,246 [15],[28]   18,246 [15],[28]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                        
Principal amount or par value 6,990 [18],[21],[25] 7,025 [15],[23],[26]   7,025 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 6,833                      
Fair Value, Ending Balance 6,929 [18],[25] 6,833 [15],[26]   6,833 [15],[26]                
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First lien                        
Principal amount or par value 7,528 [18],[20],[21] 7,547 [23],[29]   7,547 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29] 7,434                      
Fair Value, Ending Balance 7,415 [18],[20] 7,434 [29]   7,434 [29]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn                        
Principal amount or par value 99 [18],[19],[21],[22] 33 [15],[16],[23],[24]   33 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 32                      
Fair Value, Ending Balance 96 [18],[19],[22] 32 [15],[16],[24]   32 [15],[16],[24]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                        
Principal amount or par value 524 [18],[19],[21],[22] 524 [15],[16],[23],[24]   524 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (15)                      
Fair Value, Ending Balance (13) [18],[19],[22] (15) [15],[16],[24]   (15) [15],[16],[24]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                        
Principal amount or par value 887 [18],[19],[21],[22] 953 [15],[16],[23],[24]   953 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (27)                      
Fair Value, Ending Balance (22) [18],[19],[22] (27) [15],[16],[24]   (27) [15],[16],[24]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                        
Principal amount or par value 13,111 [18],[21],[27] 13,144 [15],[23],[28]   13,144 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 12,776                      
Fair Value, Ending Balance 12,790 [18],[27] 12,776 [15],[28]   12,776 [15],[28]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                        
Principal amount or par value 1,105 [18],[20],[21] 1,107 [15],[23],[29]   1,107 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 1,076                      
Fair Value, Ending Balance $ 1,078 [18],[20] 1,076 [15],[29]   $ 1,076 [15],[29]                
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                        
Preferred equity dividend rate 7.00%     7.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[43] $ 65,688                      
Fair Value, Ending Balance 66,117 [18],[19],[44] 65,688 [15],[16],[43]   $ 65,688 [15],[16],[43]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien                        
Principal amount or par value 37,765 [18],[20],[21] 37,860 [15],[23],[29]   37,860 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 36,232                      
Fair Value, Ending Balance 35,714 [18],[20] 36,232 [15],[29]   36,232 [15],[29]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 1                        
Principal amount or par value 3,975 [18],[19],[21],[22] 3,985 [15],[16],[23],[24]   3,985 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 3,814                      
Fair Value, Ending Balance 3,759 [18],[19],[22] 3,814 [15],[16],[24]   3,814 [15],[16],[24]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 2                        
Principal amount or par value 2,825 [18],[19],[21],[22] 2,623 [15],[16],[23],[24]   2,623 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 2,510                      
Fair Value, Ending Balance 2,672 [18],[19],[22] 2,510 [15],[16],[24]   2,510 [15],[16],[24]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 1                        
Principal amount or par value 202 [18],[19],[21],[22] 404 [15],[16],[23],[24]   404 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (17)                      
Fair Value, Ending Balance (11) [18],[19],[22] (17) [15],[16],[24]   (17) [15],[16],[24]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 2                        
Principal amount or par value 9,080 [18],[19],[21],[22] 9,080 [15],[16],[23],[24]   9,080 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (390)                      
Fair Value, Ending Balance $ (493) [18],[19],[22] $ (390) [15],[16],[24]   $ (390) [15],[16],[24]                
Investment, Identifier [Axis]: Diamond Parent Holdings Corp, Wholly-owned subsidiaries                        
Number of investments held | investment 2 2   2 2 2 2 2        
Investment, Identifier [Axis]: Diligent Corporation, First lien                        
Number of investments held | investment 3 3   3 3 3 3 3        
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                        
Principal amount or par value $ 1,087 [18],[19],[21],[22] $ 1,087 [15],[16],[23],[24]   $ 1,087 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 1,087                      
Fair Value, Ending Balance 1,057 [18],[19],[22] 1,087 [15],[16],[24]   1,087 [15],[16],[24]                
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn                        
Principal amount or par value 2,537 [18],[19],[21],[22] 2,537 [15],[16],[23],[24]   2,537 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24],[45] 0                      
Fair Value, Ending Balance (71) [18],[19],[22],[46] 0 [15],[16],[24],[45]   0 [15],[16],[24],[45]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                        
Principal amount or par value 17,539 [18],[20],[21] 17,583 [15],[23],[29]   17,583 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 17,371                      
Fair Value, Ending Balance 16,958 [18],[20] 17,371 [15],[29]   17,371 [15],[29]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                        
Principal amount or par value 9,780 [18],[20],[21] 9,805 [15],[23],[29]   9,805 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 9,688                      
Fair Value, Ending Balance 9,456 [18],[20] 9,688 [15],[29]   9,688 [15],[29]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 3                        
Principal amount or par value 5,812 [18],[19],[21] 5,827 [15],[16],[23]   5,827 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 5,827                      
Fair Value, Ending Balance $ 5,650 [18],[19] 5,827 [15],[16]   $ 5,827 [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],[45] $ 11,304                      
Fair Value, Ending Balance 11,303 [18],[19],[46] 11,304 [15],[16],[45]   $ 11,304 [15],[16],[45]                
Investment, Identifier [Axis]: EAB Global, Inc., Second lien                        
Principal amount or par value 33,452 [18],[20],[21] 33,452 [15],[23],[29]   33,452 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 32,392                      
Fair Value, Ending Balance 32,603 [18],[20] 32,392 [15],[29]   32,392 [15],[29]                
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                        
Principal amount or par value [18],[20],[21] 10,676                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[20] 10,676                      
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 2                        
Principal amount or par value [18],[19],[21] 342                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 342                      
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC, Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[20] 3,687                      
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC, Ordinary shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19] 407                      
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                        
Principal amount or par value 17,170 [18],[19],[21] 16,473 [15],[16],[23]   16,473 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 16,473                      
Fair Value, Ending Balance 17,170 [18],[19],[47] 16,473 [15],[16]   16,473 [15],[16]                
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 0 [20] 0 [29]   0 [29]                
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 0 [19] 0 [16]   0 [16]                
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 [20] 0 [29]   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 [16]   0 [16]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 1                        
Principal amount or par value 300 [20],[21] 300 [23],[29]   300 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29] 0                      
Fair Value, Ending Balance 0 [20] 0 [29]   0 [29]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 2                        
Principal amount or par value 169 [19],[21] 169 [16],[23]   169 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16] 0                      
Fair Value, Ending Balance 0 [19] 0 [16]   0 [16]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 3                        
Principal amount or par value 205 [20],[21] 205 [23],[29]   205 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29] 0                      
Fair Value, Ending Balance 0 [20] 0 [29]   0 [29]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 4                        
Principal amount or par value 115 [19],[21] 115 [16],[23]   115 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16] 0                      
Fair Value, Ending Balance 0 [19] 0 [16]   0 [16]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 5                        
Principal amount or par value 139 [20],[21] 139 [23],[29]   139 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29] 0                      
Fair Value, Ending Balance 0 [20] 0 [29]   0 [29]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 6                        
Principal amount or par value 79 [19],[21] 79 [16],[23]   79 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16] 0                      
Fair Value, Ending Balance 0 [19] 0 [16]   0 [16]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 7                        
Principal amount or par value 4 [20],[21] 4 [23],[29]   4 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [29] 0                      
Fair Value, Ending Balance 0 [20] 0 [29]   0 [29]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 8                        
Principal amount or par value 2 [19],[21] 2 [16],[23]   2 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16] 0                      
Fair Value, Ending Balance 0 [19] 0 [16]   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                      
Investment, Identifier [Axis]: FR Arsenal Holdings II Corp., First lien                        
Principal amount or par value [15],[23],[29]   14,582   14,582                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] $ 13,123                      
Fair Value, Ending Balance [15],[29]   $ 13,123   $ 13,123                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien                        
Number of investments held | investment 2 2   2 2 2 2 2        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 1                        
Principal amount or par value $ 945 [18],[19],[21],[22] $ 490 [15],[16],[23],[24]   $ 490 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 477                      
Fair Value, Ending Balance 923 [18],[19],[22] 477 [15],[16],[24]   477 [15],[16],[24]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 2                        
Principal amount or par value 1,566 [18],[19],[21],[22] 589 [15],[16],[23],[24]   589 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 584                      
Fair Value, Ending Balance 1,551 [18],[19],[22] 584 [15],[16],[24]   584 [15],[16],[24]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                        
Principal amount or par value 455 [18],[19],[21],[22] 910 [15],[16],[23],[24]   910 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (25)                      
Fair Value, Ending Balance (11) [18],[19],[22] (25) [15],[16],[24]   (25) [15],[16],[24]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                        
Principal amount or par value 4,187 [18],[19],[21],[22] 5,165 [15],[16],[23],[24]   5,165 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (52)                      
Fair Value, Ending Balance (42) [18],[19],[22] (52) [15],[16],[24]   (52) [15],[16],[24]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                        
Principal amount or par value 10,369 [18],[21],[41] 10,395 [15],[23],[42]   10,395 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 10,110                      
Fair Value, Ending Balance 10,129 [18],[41] 10,110 [15],[42]   10,110 [15],[42]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                        
Principal amount or par value 3,480 [18],[21],[41] 3,489 [15],[23],[42]   3,489 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 3,393                      
Fair Value, Ending Balance 3,400 [18],[41] 3,393 [15],[42]   3,393 [15],[42]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                        
Principal amount or par value 3,458 [18],[21],[41] 3,467 [15],[23],[42]   3,467 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 3,372                      
Fair Value, Ending Balance 3,378 [18],[41] 3,372 [15],[42]   3,372 [15],[42]                
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42],[48] 4,686                      
Fair Value, Ending Balance 4,461 [18],[41],[49] 4,686 [15],[42],[48]   4,686 [15],[42],[48]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,095 [18],[19],[21],[22] 2,095 [15],[16],[23],[24]   2,095 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (21)                      
Fair Value, Ending Balance (21) [18],[19],[22] (21) [15],[16],[24]   (21) [15],[16],[24]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                        
Principal amount or par value 4,767 [18],[19],[21],[22] 4,907 [15],[16],[23],[24]   4,907 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (49)                      
Fair Value, Ending Balance (48) [18],[19],[22] (49) [15],[16],[24]   (49) [15],[16],[24]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                        
Principal amount or par value 33,954 [18],[20],[21] 31,968 [15],[23],[29]   31,968 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 31,648                      
Fair Value, Ending Balance 33,615 [18],[20] 31,648 [15],[29]   31,648 [15],[29]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                        
Principal amount or par value 139 [18],[19],[21] 2,072 [15],[16],[23]   2,072 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 2,051                      
Fair Value, Ending Balance 138 [18],[19] 2,051 [15],[16]   2,051 [15],[16]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn                        
Principal amount or par value [15],[16],[23],[24]   381   381                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 372                      
Fair Value, Ending Balance [15],[16],[24]   372   372                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 1                        
Principal amount or par value [18],[19],[21],[22] 381                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 372                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 2                        
Principal amount or par value [18],[19],[21],[22] 81                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 79                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 3                        
Principal amount or par value [18],[19],[21],[22] 29                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 29                      
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,479 [18],[19],[21],[22] 81 [15],[16],[23],[24]   81 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (2)                      
Fair Value, Ending Balance (55) [18],[19],[22] (2) [15],[16],[24]   (2) [15],[16],[24]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                        
Principal amount or par value 4,857 [18],[19],[21],[22] 2,479 [15],[16],[23],[24]   2,479 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (58)                      
Fair Value, Ending Balance (107) [18],[19],[22] (58) [15],[16],[24]   (58) [15],[16],[24]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 3                        
Principal amount or par value [15],[16],[23],[24]   4,886   4,886                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (114)                      
Fair Value, Ending Balance [15],[16],[24]   (114)   (114)                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                        
Principal amount or par value 17,485 [18],[20],[21] 17,529 [15],[23],[29]   17,529 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 17,119                      
Fair Value, Ending Balance 17,099 [18],[20] 17,119 [15],[29]   17,119 [15],[29]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                        
Principal amount or par value 10,170 [18],[21],[27] 10,195 [15],[23],[28]   10,195 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 9,957                      
Fair Value, Ending Balance 9,945 [18],[27] 9,957 [15],[28]   9,957 [15],[28]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                        
Principal amount or par value 873 [18],[19],[21] 875 [15],[16],[23]   875 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 855                      
Fair Value, Ending Balance 854 [18],[19] 855 [15],[16]   855 [15],[16]                
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                        
Principal amount or par value 22,500 [18],[21],[41] 22,500 [15],[23],[42]   22,500 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 20,810                      
Fair Value, Ending Balance 21,128 [18],[41] 20,810 [15],[42]   20,810 [15],[42]                
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                        
Principal amount or par value 7,009 [18],[20],[21] 7,009 [15],[23],[29]   7,009 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 6,483                      
Fair Value, Ending Balance 6,581 [18],[20] 6,483 [15],[29]   6,483 [15],[29]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 1                        
Principal amount or par value 16,873 [18],[20],[21],[22] 16,611 [15],[23],[24],[29]   16,611 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] 16,411                      
Fair Value, Ending Balance 16,873 [18],[20],[22] 16,411 [15],[24],[29]   16,411 [15],[24],[29]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 2                        
Principal amount or par value 988 [18],[19],[21],[22] 988 [15],[16],[23],[24]   988 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 976                      
Fair Value, Ending Balance 988 [18],[19],[22] 976 [15],[16],[24]   976 [15],[16],[24]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 453 [18],[20],[21],[22] 757 [15],[23],[24],[29]   757 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] (9)                      
Fair Value, Ending Balance 0 [18],[20],[22] (9) [15],[24],[29]   (9) [15],[24],[29]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 2,963 [18],[19],[21],[22] 2,963 [15],[16],[23],[24]   2,963 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (36)                      
Fair Value, Ending Balance 0 [18],[19],[22] (36) [15],[16],[24]   (36) [15],[16],[24]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                        
Principal amount or par value 21,830 [18],[21],[41] 21,885 [15],[23],[42]   21,885 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 21,623                      
Fair Value, Ending Balance 21,829 [18],[41] 21,623 [15],[42]   21,623 [15],[42]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                        
Principal amount or par value 13,177 [18],[20],[21] 13,211 [15],[23],[29]   13,211 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 13,052                      
Fair Value, Ending Balance 13,177 [18],[20] 13,052 [15],[29]   13,052 [15],[29]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 3                        
Principal amount or par value 10,524 [18],[20],[21] 10,551 [15],[23],[29]   10,551 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 10,424                      
Fair Value, Ending Balance 10,524 [18],[20] 10,424 [15],[29]   10,424 [15],[29]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                        
Principal amount or par value 5,917 [18],[19],[21],[22] 5,917 [15],[16],[23],[24]   5,917 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (53)                      
Fair Value, Ending Balance (53) [18],[19],[22] (53) [15],[16],[24]   (53) [15],[16],[24]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                        
Principal amount or par value 67,102 [18],[20],[21] 67,275 [15],[23],[29]   67,275 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 66,675                      
Fair Value, Ending Balance 66,504 [18],[20] 66,675 [15],[29]   66,675 [15],[29]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                        
Principal amount or par value 21,689 [18],[21],[41] 21,745 [15],[23],[42]   21,745 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 21,551                      
Fair Value, Ending Balance 21,497 [18],[41] 21,551 [15],[42]   21,551 [15],[42]                
Investment, Identifier [Axis]: Granicus, Inc., First lien - Drawn                        
Principal amount or par value 1,269 [18],[19],[21],[22] 810 [15],[16],[23],[24]   810 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 810                      
Fair Value, Ending Balance 1,269 [18],[19],[22] 810 [15],[16],[24]   810 [15],[16],[24]                
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn                        
Principal amount or par value 1,145 [18],[19],[21],[22] 1,604 [15],[16],[23],[24]   1,604 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 1                        
Principal amount or par value 15,403 [18],[21],[25] 15,405 [15],[23],[26]   15,405 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 15,405                      
Fair Value, Ending Balance 15,403 [18],[25] 15,405 [15],[26]   15,405 [15],[26]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 2                        
Principal amount or par value 5,958 [18],[21],[27] 5,959 [15],[23],[28]   5,959 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 5,959                      
Fair Value, Ending Balance 5,958 [18],[27] 5,959 [15],[28]   5,959 [15],[28]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 3                        
Principal amount or par value 5,877 [18],[20],[21] 5,877 [15],[23],[29]   5,877 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 5,877                      
Fair Value, Ending Balance 5,877 [18],[20] 5,877 [15],[29]   5,877 [15],[29]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 4                        
Principal amount or par value 4,565 [18],[20],[21] 4,579 [15],[23],[29]   4,579 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 4,579                      
Fair Value, Ending Balance 4,565 [18],[20] 4,579 [15],[29]   $ 4,579 [15],[29]                
Investment, Identifier [Axis]: Groundworks, LLC, First lien                        
Principal amount or par value [21],[25] 17,338                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [25] 17,078                      
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 1                        
Principal amount or par value [19],[21],[22] 1,076                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [19],[22] (16)                      
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 2                        
Principal amount or par value [21],[22],[25] 3,164                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [22],[25] $ (47)                      
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],[50],[51] $ 5,126                      
Fair Value, Ending Balance 5,128 [18],[52],[53] 5,126 [15],[50],[51]   $ 5,126 [15],[50],[51]                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                        
Principal amount or par value 22,500 [18],[21],[41] 22,500 [15],[23],[42]   22,500 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 21,409                      
Fair Value, Ending Balance 21,204 [18],[41] 21,409 [15],[42]   21,409 [15],[42]                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                        
Principal amount or par value 4,208 [18],[20],[21] 4,208 [15],[23],[29]   4,208 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 4,004                      
Fair Value, Ending Balance 3,966 [18],[20] 4,004 [15],[29]   4,004 [15],[29]                
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[54] 35,679                      
Fair Value, Ending Balance 16,301 [18],[55] 35,679 [15],[54]   35,679 [15],[54]                
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Profit Interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[56] 109                      
Fair Value, Ending Balance 90 [18],[57] 109 [15],[56]   109 [15],[56]                
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                        
Principal amount or par value 8,000 [18],[19],[21],[22] 8,000 [15],[16],[23],[24]   8,000 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24],[58] 0                      
Fair Value, Ending Balance 0 [18],[19],[22],[59] 0 [15],[16],[24],[58]   0 [15],[16],[24],[58]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Drawn                        
Principal amount or par value [15],[16],[23],[24]   919   919                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 906                      
Fair Value, Ending Balance [15],[16],[24]   906   906                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                        
Principal amount or par value 2,298 [18],[19],[21],[22] 1,379 [15],[16],[23],[24]   1,379 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (19)                      
Fair Value, Ending Balance (23) [18],[19],[22] (19) [15],[16],[24]   (19) [15],[16],[24]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                        
Principal amount or par value 29,060 [18],[20],[21] 29,134 [15],[23],[29]   29,134 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 28,731                      
Fair Value, Ending Balance 28,766 [18],[20] 28,731 [15],[29]   28,731 [15],[29]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                        
Principal amount or par value 4,246 [18],[20],[21] 4,257 [15],[23],[29]   4,257 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 4,198                      
Fair Value, Ending Balance 4,203 [18],[20] 4,198 [15],[29]   4,198 [15],[29]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien                        
Principal amount or par value 12,942 [18],[20],[21] 12,974 [15],[23],[29]   12,974 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 12,845                      
Fair Value, Ending Balance 12,683 [18],[20] 12,845 [15],[29]   12,845 [15],[29]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn                        
Principal amount or par value 604 [18],[19],[21],[22] 294 [15],[16],[23],[24]   294 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 291                      
Fair Value, Ending Balance 593 [18],[19],[22] 291 [15],[16],[24]   291 [15],[16],[24]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value 945 [18],[19],[21],[22] 1,254 [15],[16],[23],[24]   1,254 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (13)                      
Fair Value, Ending Balance (17) [18],[19],[22] (13) [15],[16],[24]   (13) [15],[16],[24]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value 3,097 [18],[19],[21],[22] 3,097 [15],[16],[23],[24]   3,097 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (31)                      
Fair Value, Ending Balance (62) [18],[19],[22] (31) [15],[16],[24]   (31) [15],[16],[24]                
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                        
Principal amount or par value 22,500 [18],[21],[25] 22,500 [15],[23],[26]   22,500 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 21,168                      
Fair Value, Ending Balance 21,823 [18],[25] 21,168 [15],[26]   21,168 [15],[26]                
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                        
Principal amount or par value 3,000 [18],[19],[21] 3,000 [15],[16],[23]   3,000 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 2,822                      
Fair Value, Ending Balance 2,910 [18],[19] 2,822 [15],[16]   2,822 [15],[16]                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Drawn                        
Principal amount or par value [15],[16],[23],[24]   1,068   1,068                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 1,048                      
Fair Value, Ending Balance [15],[16],[24]   1,048   1,048                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                        
Principal amount or par value 3,827 [18],[19],[21],[22] 2,759 [15],[16],[23],[24]   2,759 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (52)                      
Fair Value, Ending Balance (29) [18],[19],[22] (52) [15],[16],[24]   (52) [15],[16],[24]                
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                        
Principal amount or par value 18,850 [18],[20],[21] 18,898 [15],[23],[29]   18,898 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 18,545                      
Fair Value, Ending Balance 18,705 [18],[20] 18,545 [15],[29]   18,545 [15],[29]                
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                        
Principal amount or par value 7,904 [18],[21],[27] 7,923 [15],[23],[28]   7,923 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 7,775                      
Fair Value, Ending Balance 7,843 [18],[27] 7,775 [15],[28]   7,775 [15],[28]                
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                        
Principal amount or par value 17,245 [18],[19],[21] 17,245 [15],[16],[23]   17,245 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 16,846                      
Fair Value, Ending Balance 16,643 [18],[19] 16,846 [15],[16]   16,846 [15],[16]                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                        
Principal amount or par value 3,896 [18],[20],[21] 4,187 [15],[23],[29]   4,187 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 4,187                      
Fair Value, Ending Balance 3,897 [18],[20] 4,187 [15],[29]   4,187 [15],[29]                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                        
Principal amount or par value 769 [18],[19],[21] 827 [15],[16],[23]   827 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 828                      
Fair Value, Ending Balance 770 [18],[19] 828 [15],[16]   828 [15],[16]                
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                        
Principal amount or par value 12,000 [18],[19],[21] 11,510 [15],[16],[23]   11,510 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 8,718                      
Fair Value, Ending Balance 9,560 [18],[19] 8,718 [15],[16]   8,718 [15],[16]                
Investment, Identifier [Axis]: Integro Parent Inc., Second lien, Non-accrual status                        
Principal amount or par value                 $ 4,200      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 3,346                      
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 1                        
Principal amount or par value 18,750 [18],[20],[21] 18,750 [15],[23],[29]   18,750 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 15,938                      
Fair Value, Ending Balance 15,937 [18],[20] 15,938 [15],[29]   15,938 [15],[29]                
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 2                        
Principal amount or par value 18,750 [18],[21],[27] 18,750 [15],[23],[28]   18,750 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 15,937                      
Fair Value, Ending Balance 15,937 [18],[27] 15,937 [15],[28]   15,937 [15],[28]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                        
Principal amount or par value 276 [18],[20],[21],[22] 145 [15],[23],[24],[29]   145 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] 139                      
Fair Value, Ending Balance 263 [18],[20],[22] 139 [15],[24],[29]   139 [15],[24],[29]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                        
Principal amount or par value 891 [18],[20],[21],[22] 1,022 [15],[23],[24],[29]   1,022 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] (45)                      
Fair Value, Ending Balance (41) [18],[20],[22] (45) [15],[24],[29]   (45) [15],[24],[29]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                        
Principal amount or par value 6,950 [18],[21],[27] 6,968 [15],[23],[28]   6,968 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 6,662                      
Fair Value, Ending Balance 6,629 [18],[27] 6,662 [15],[28]   6,662 [15],[28]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                        
Principal amount or par value 800 [18],[20],[21] 801 [15],[23],[29]   801 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 766                      
Fair Value, Ending Balance 763 [18],[20] 766 [15],[29]   766 [15],[29]                
Investment, Identifier [Axis]: Kaseya Inc., First lien                        
Principal amount or par value 63,093 [18],[20],[21] 63,093 [15],[23],[29]   63,093 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29],[60] 62,172                      
Fair Value, Ending Balance 62,620 [18],[20],[61] 62,172 [15],[29],[60]   62,172 [15],[29],[60]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                        
Principal amount or par value 3,851 [18],[19],[21],[22] 3,851 [15],[16],[23],[24]   3,851 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (56)                      
Fair Value, Ending Balance (29) [18],[19],[22] (56) [15],[16],[24]   (56) [15],[16],[24]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                        
Principal amount or par value 3,851 [18],[19],[21],[22] 3,851 [15],[16],[23],[24]   3,851 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (56)                      
Fair Value, Ending Balance (29) [18],[19],[22] (56) [15],[16],[24]   (56) [15],[16],[24]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien                        
Principal amount or par value 15,747 [18],[21],[41] 15,788 [15],[23],[42]   15,788 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 15,788                      
Fair Value, Ending Balance 15,747 [18],[41] 15,788 [15],[42]   15,788 [15],[42]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                        
Principal amount or par value 1,799 [18],[19],[21],[22] 1,799 [15],[16],[23],[24]   1,799 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc., Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[60] 14,661                      
Fair Value, Ending Balance $ 15,888 [18],[19],[61] 14,661 [15],[16],[60]   $ 14,661 [15],[16],[60]                
Investment, Identifier [Axis]: Knockout Intermediate Holdings I, Preferred shares                        
Preferred equity dividend rate 11.75%     11.75%                
Investment, Identifier [Axis]: MED Parentco, LP, Second lien                        
Principal amount or par value $ 20,857 [21],[27] 20,857 [23],[28]   $ 20,857 [23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [28] 15,726                      
Fair Value, Ending Balance 16,164 [27] 15,726 [28]   15,726 [28]                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                        
Principal amount or par value [15],[16],[23],[24]   2,002   2,002                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (45)                      
Fair Value, Ending Balance [15],[16],[24]   (45)   (45)                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                        
Principal amount or par value [18],[19],[21],[22] 2,002                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (50)                      
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 2                        
Principal amount or par value 2,501 [18],[19],[21],[22] 4,074 [15],[16],[23],[24]   4,074 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (92)                      
Fair Value, Ending Balance (63) [18],[19],[22] (92) [15],[16],[24]   (92) [15],[16],[24]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                        
Principal amount or par value 21,823 [18],[21],[41] 21,879 [15],[23],[42]   21,879 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 21,383                      
Fair Value, Ending Balance 21,273 [18],[41] 21,383 [15],[42]   21,383 [15],[42]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                        
Principal amount or par value 5,224 [18],[19],[21] 4,615 [15],[23],[29]   4,615 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 4,511                      
Fair Value, Ending Balance 5,092 [18],[19] 4,511 [15],[29]   4,511 [15],[29]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                        
Principal amount or par value 4,604 [18],[20],[21] 3,173 [15],[23],[29]   3,173 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 3,101                      
Fair Value, Ending Balance 4,488 [18],[20] 3,101 [15],[29]   3,101 [15],[29]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                        
Principal amount or par value 3,164 [18],[20],[21] 3,664 [15],[16],[23]   3,664 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 3,581                      
Fair Value, Ending Balance 3,085 [18],[20] 3,581 [15],[16]   3,581 [15],[16]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                        
Principal amount or par value 808 [18],[19],[21] 810 [15],[16],[23]   810 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 791                      
Fair Value, Ending Balance 787 [18],[19] 791 [15],[16]   791 [15],[16]                
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],[62] 0                      
Fair Value, Ending Balance 0 [18],[19],[63] 0 [15],[16],[62]   0 [15],[16],[62]                
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[62] 0                      
Fair Value, Ending Balance 0 [18],[19],[63] 0 [15],[16],[62]   0 [15],[16],[62]                
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],[64] 0                      
Fair Value, Ending Balance 0 [18],[38],[65] 0 [15],[37],[64]   0 [15],[37],[64]                
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],[64] 0                      
Fair Value, Ending Balance 0 [18],[65] 0 [15],[64]   0 [15],[64]                
Investment, Identifier [Axis]: NM CLFX LP, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[64] 16,172                      
Fair Value, Ending Balance 15,437 [18],[65] 16,172 [15],[64]   16,172 [15],[64]                
Investment, Identifier [Axis]: NM DRVT LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[64] 0                      
Fair Value, Ending Balance 0 [18],[65] 0 [15],[64]   0 [15],[64]                
Investment, Identifier [Axis]: NM GLCR LP, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[64] 0                      
Fair Value, Ending Balance 0 [18],[65] 0 [15],[64]   0 [15],[64]                
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],[64] 1,028                      
Fair Value, Ending Balance 1,029 [18],[38],[65] 1,028 [15],[37],[64]   1,028 [15],[37],[64]                
Investment, Identifier [Axis]: NM JRA LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[64] 0                      
Fair Value, Ending Balance 0 [18],[65] 0 [15],[64]   0 [15],[64]                
Investment, Identifier [Axis]: NM KRLN LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[64] 0                      
Fair Value, Ending Balance 0 [18],[65] 0 [15],[64]   0 [15],[64]                
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],[64] 94,305                      
Fair Value, Ending Balance 94,576 [18],[38],[65] 94,305 [15],[37],[64]   94,305 [15],[37],[64]                
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[64] 9,481                      
Fair Value, Ending Balance 9,581 [18],[65] 9,481 [15],[64]   9,481 [15],[64]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Drawn                        
Principal amount or par value 1,635 [18],[19],[21],[22] 1,635 [15],[16],[23],[24]   1,635 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 1,624                      
Fair Value, Ending Balance 1,635 [18],[19],[22] 1,624 [15],[16],[24]   1,624 [15],[16],[24]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Undrawn                        
Principal amount or par value 4,266 [18],[19],[21],[22] 9,029 [15],[16],[23],[24]   9,029 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (63)                      
Fair Value, Ending Balance 0 [18],[19],[22] (63) [15],[16],[24]   (63) [15],[16],[24]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                        
Principal amount or par value 19,259 [18],[21],[27] 19,259 [15],[23],[28]   19,259 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 19,124                      
Fair Value, Ending Balance 19,259 [18],[27] 19,124 [15],[28]   19,124 [15],[28]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                        
Principal amount or par value 4,913 [18],[20],[21] 4,913 [15],[23],[29]   4,913 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 4,879                      
Fair Value, Ending Balance 4,913 [18],[20] 4,879 [15],[29]   4,879 [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 [15],[16],[37]   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 [15],[16],[37]   112,400 [15],[16],[37]                
Investment, Identifier [Axis]: National HME, Inc., Second lien                        
Principal amount or par value [18],[19],[21] 8,281                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[63] 5,000                      
Other Income   (1,500)                    
Investment, Identifier [Axis]: National HME, Inc., Second lien 1                        
Principal amount or par value [15],[16],[23]   13,013   13,013                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 5,381                      
Fair Value, Ending Balance [15],[16]   5,381   5,381                
Investment, Identifier [Axis]: National HME, Inc., Second lien 2                        
Principal amount or par value [15],[16],[23]   14,500   14,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 0                      
Fair Value, Ending Balance [15],[16]   0   0                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                        
Principal amount or par value 37,384 [18],[20],[21] 35,541 [15],[23],[29]   35,541 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 35,541                      
Fair Value, Ending Balance 37,384 [18],[20] 35,541 [15],[29]   35,541 [15],[29]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                        
Principal amount or par value 9,172 [18],[21],[27] 8,720 [15],[23],[28]   8,720 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 8,720                      
Fair Value, Ending Balance 9,172 [18],[27] 8,720 [15],[28]   8,720 [15],[28]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                        
Principal amount or par value 11,521 [18],[19],[21] 4,282 [15],[16],[23]   4,282 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 4,282                      
Fair Value, Ending Balance 11,521 [18],[19] 4,282 [15],[16]   4,282 [15],[16]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                        
Principal amount or par value 19 [18],[19],[21] 18,687 [15],[16],[23]   18,687 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 14,950                      
Fair Value, Ending Balance 15,331 [18],[19] 14,950 [15],[16]   14,950 [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] 34,490                      
Fair Value, Ending Balance 34,490 [18],[20] 34,490 [15],[29]   34,490 [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],[28] 8,462                      
Fair Value, Ending Balance 8,462 [18],[27] 8,462 [15],[28]   8,462 [15],[28]                
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] 7,701                      
Fair Value, Ending Balance 7,701 [18],[19] 7,701 [15],[16]   7,701 [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] 26,000                      
Fair Value, Ending Balance 25,999 [18],[19] 26,000 [15],[16]   26,000 [15],[16]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                        
Principal amount or par value 22,760 [18],[19],[21] 21,779 [15],[16],[23]   21,779 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 21,779                      
Fair Value, Ending Balance 22,760 [18],[19] 21,779 [15],[16]   21,779 [15],[16]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                        
Principal amount or par value 10,117 [18],[19],[21],[22] 9,785 [15],[16],[23],[24]   9,785 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 9,785                      
Fair Value, Ending Balance 10,117 [18],[19],[22] 9,785 [15],[16],[24]   9,785 [15],[16],[24]                
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 [15],[16],[23],[24]   1,577 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 0                      
Fair Value, Ending Balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [15],[16],[24]                
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien                        
Principal amount or par value 26,762 [18],[20],[21] 26,762 [15],[23],[29]   26,762 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 20,101                      
Fair Value, Ending Balance 18,924 [18],[20] 20,101 [15],[29]   20,101 [15],[29]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 1                        
Principal amount or par value 874 [18],[19],[21],[22] 876 [15],[16],[23],[24]   876 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 861                      
Fair Value, Ending Balance 834 [18],[19],[22] 861 [15],[16],[24]   861 [15],[16],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 2                        
Principal amount or par value 176 [18],[19],[21],[22] 147 [15],[16],[23],[24]   147 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 145                      
Fair Value, Ending Balance 169 [18],[19],[22] 145 [15],[16],[24]   145 [15],[16],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 1                        
Principal amount or par value 587 [18],[19],[21],[22] 587 [15],[16],[23],[24]   587 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (10)                      
Fair Value, Ending Balance (26) [18],[19],[22] (10) [15],[16],[24]   (10) [15],[16],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 2                        
Principal amount or par value 704 [18],[19],[21],[22] 734 [15],[16],[23],[24]   734 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (12)                      
Fair Value, Ending Balance (32) [18],[19],[22] (12) [15],[16],[24]   (12) [15],[16],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                        
Principal amount or par value 10,026 [18],[21],[27] 10,051 [15],[23],[28]   10,051 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 9,882                      
Fair Value, Ending Balance 9,576 [18],[27] 9,882 [15],[28]   9,882 [15],[28]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                        
Principal amount or par value 9,900 [18],[21],[27] 9,925 [15],[23],[28]   9,925 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 9,758                      
Fair Value, Ending Balance 9,455 [18],[27] 9,758 [15],[28]   9,758 [15],[28]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                        
Principal amount or par value 3,600 [18],[19],[21],[22] 3,600 [15],[16],[23],[24]   3,600 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24],[66] (29)                      
Fair Value, Ending Balance (23) [18],[19],[22],[67] (29) [15],[16],[24],[66]   (29) [15],[16],[24],[66]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                        
Principal amount or par value 27,919 [18],[20],[21] 27,989 [15],[23],[29]   27,989 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 27,763                      
Fair Value, Ending Balance 27,741 [18],[20] 27,763 [15],[29]   27,763 [15],[29]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                        
Principal amount or par value 1,767 [18],[20],[21] 1,772 [15],[23],[29]   1,772 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 1,757                      
Fair Value, Ending Balance 1,756 [18],[20] 1,757 [15],[29]   1,757 [15],[29]                
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[66] 2,000                      
Fair Value, Ending Balance $ 2,206 [18],[19],[67] 2,000 [15],[16],[66]   $ 2,000 [15],[16],[66]                
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 [15],[68],[69] $ 7,214                      
Fair Value, Ending Balance $ 7,525 [18],[70],[71] $ 7,214 [15],[68],[69]   $ 7,214 [15],[68],[69]                
Investment, Identifier [Axis]: OEConnection LLC, Second lien                        
Number of investments held | investment 2 2   2 2 2 2 2        
Investment, Identifier [Axis]: OEConnection LLC, Second lien 1                        
Principal amount or par value $ 23,406 [18],[20],[21] $ 23,406 [15],[23],[29]   $ 23,406 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 22,687                      
Fair Value, Ending Balance 22,933 [18],[20] 22,687 [15],[29]   22,687 [15],[29]                
Investment, Identifier [Axis]: OEConnection LLC, Second lien 2                        
Principal amount or par value 12,044 [18],[20],[21] 12,044 [15],[23],[29]   12,044 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 11,674                      
Fair Value, Ending Balance 11,801 [18],[20] 11,674 [15],[29]   11,674 [15],[29]                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                        
Principal amount or par value [18],[19],[21],[22] 1,860                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (9)                      
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 1                        
Principal amount or par value [18],[21],[27] 7,440                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[27] 7,404                      
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 2                        
Principal amount or par value [18],[20],[21] 7,440                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[20] 7,404                      
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien                        
Principal amount or par value 7,205 [18],[21],[25] 6,629 [15],[23],[26]   6,629 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 6,500                      
Fair Value, Ending Balance 7,049 [18],[25] 6,500 [15],[26]   6,500 [15],[26]                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Drawn                        
Principal amount or par value [15],[16],[23],[24]   131   131                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 129                      
Fair Value, Ending Balance [15],[16],[24]   129   129                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 1                        
Principal amount or par value 309 [18],[21],[22],[25] 355 [15],[16],[23],[24]   355 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (7)                      
Fair Value, Ending Balance (7) [18],[22],[25] (7) [15],[16],[24]   (7) [15],[16],[24]                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 2                        
Principal amount or par value 486 [18],[19],[21],[22] 885 [15],[23],[24],[26]   885 [15],[23],[24],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[26] (17)                      
Fair Value, Ending Balance (11) [18],[19],[22] (17) [15],[24],[26]   (17) [15],[24],[26]                
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                        
Principal amount or par value 14,500 [18],[19],[21] 14,500 [15],[16],[23]   14,500 [15],[16],[23]               $ 20,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 7,995                      
Fair Value, Ending Balance 7,995 [18],[19] 7,995 [15],[16]   7,995 [15],[16]                
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                        
Principal amount or par value 0 [21],[72],[73] 0 [23],[74],[75]   0 [23],[74],[75]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [74],[75] 0                      
Fair Value, Ending Balance 0 [72],[73] 0 [74],[75]   0 [74],[75]                
Investment, Identifier [Axis]: Permian Trust, First lien 1                        
Principal amount or par value 247 [18],[21],[76] 247 [15],[23],[77]   247 [15],[23],[77]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[77] 0                      
Fair Value, Ending Balance 0 [18],[76] 0 [15],[77]   0 [15],[77]                
Investment, Identifier [Axis]: Permian Trust, First lien 2                        
Principal amount or par value 3,409 [18],[19],[21] 3,409 [15],[16],[23]   3,409 [15],[16],[23]                
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 [15],[16]   0 [15],[16]                
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 1                        
Principal amount or par value 49,160 [18],[20],[21] 49,270 [15],[23],[29]   49,270 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 49,270                      
Fair Value, Ending Balance 49,159 [18],[20] 49,270 [15],[29]   49,270 [15],[29]                
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 2                        
Principal amount or par value 18,655 [18],[20],[21] 18,726 [15],[23],[29]   18,726 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 18,726                      
Fair Value, Ending Balance 18,655 [18],[20] 18,726 [15],[29]   18,726 [15],[29]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                        
Principal amount or par value 2,446 [18],[19],[21],[22] 2,446 [15],[16],[23],[24]   2,446 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24],[78] (32)                      
Fair Value, Ending Balance (15) [18],[19],[22],[79] (32) [15],[16],[24],[78]   (32) [15],[16],[24],[78]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                        
Principal amount or par value 15,341 [18],[21],[27] 14,900 [15],[23],[28]   14,900 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 14,706                      
Fair Value, Ending Balance 15,246 [18],[27] 14,706 [15],[28]   14,706 [15],[28]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                        
Principal amount or par value 2,103 [18],[21],[27] 2,042 [15],[23],[28]   2,042 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 2,016                      
Fair Value, Ending Balance 2,090 [18],[27] 2,016 [15],[28]   2,016 [15],[28]                
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[78],[80] 1,631                      
Fair Value, Ending Balance $ 1,614 [18],[79],[81] 1,631 [15],[78],[80]   $ 1,631 [15],[78],[80]                
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],[82] $ 11,569                      
Fair Value, Ending Balance 11,713 [18],[19],[83] 11,569 [15],[16],[82]   $ 11,569 [15],[16],[82]                
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien                        
Principal amount or par value [18],[20],[21] 3,580                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[20] 3,527                      
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien - Undrawn                        
Principal amount or par value [18],[19],[21],[22] 184                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (3)                      
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien                        
Principal amount or par value 5,148 [18],[20],[21] 5,161 [15],[23],[29]   5,161 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 5,014                      
Fair Value, Ending Balance 5,024 [18],[20] 5,014 [15],[29]   5,014 [15],[29]                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Drawn                        
Principal amount or par value [15],[16],[23],[24]   422   422                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 410                      
Fair Value, Ending Balance [15],[16],[24]   410   410                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                        
Principal amount or par value 1,161 [18],[19],[21],[22] 483 [15],[16],[23],[24]   483 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (14)                      
Fair Value, Ending Balance (28) [18],[19],[22] (14) [15],[16],[24]   (14) [15],[16],[24]                
Investment, Identifier [Axis]: Quartz Holding Company, Second lien                        
Principal amount or par value 10,000 [18],[19],[21] 10,000 [15],[16],[23]   10,000 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 9,802                      
Fair Value, Ending Balance 9,884 [18],[19] 9,802 [15],[16]   9,802 [15],[16]                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                        
Principal amount or par value 2,981 [18],[19],[21],[22] 2,981 [15],[16],[23],[24]   2,981 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (25)                      
Fair Value, Ending Balance (15) [18],[19],[22] (25) [15],[16],[24]   (25) [15],[16],[24]                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 1                        
Principal amount or par value 24,406 [18],[21],[27] 24,469 [15],[23],[28]   24,469 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 24,263                      
Fair Value, Ending Balance 24,282 [18],[27] 24,263 [15],[28]   24,263 [15],[28]                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 2                        
Principal amount or par value 12,620 [18],[20],[21] 12,652 [15],[23],[29]   12,652 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 12,546                      
Fair Value, Ending Balance 12,556 [18],[20] 12,546 [15],[29]   12,546 [15],[29]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien                        
Principal amount or par value 6,957 [18],[20],[21] 6,975 [15],[23],[29]   6,975 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 6,861                      
Fair Value, Ending Balance 6,877 [18],[20] 6,861 [15],[29]   6,861 [15],[29]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 128                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 126                      
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                        
Principal amount or par value 384 [18],[19],[21],[22] 512 [15],[16],[23],[24]   512 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (8)                      
Fair Value, Ending Balance (4) [18],[19],[22] (8) [15],[16],[24]   (8) [15],[16],[24]                
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],[20] 3,599 [15],[29]   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 [15],[16]   401 [15],[16]                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Second lien                        
Principal amount or par value 5 [18],[19],[21] 5 [15],[16],[23]   5 [15],[16],[23]                
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 [15],[16]   0 [15],[16]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien                        
Principal amount or par value 10,432 [18],[20],[21] 10,458 [15],[23],[29]   10,458 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 10,019                      
Fair Value, Ending Balance 9,987 [18],[20] 10,019 [15],[29]   10,019 [15],[29]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn                        
Principal amount or par value [18],[19],[21],[22] 78                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 75                      
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 1                        
Principal amount or par value [15],[16],[23],[24]   212   212                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 204                      
Fair Value, Ending Balance [15],[16],[24]   204   204                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 2                        
Principal amount or par value [15],[16],[23],[24]   79   79                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 75                      
Fair Value, Ending Balance [15],[16],[24]   75   75                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 1                        
Principal amount or par value 559 [18],[19],[21],[22] 347 [15],[16],[23],[24]   347 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (15)                      
Fair Value, Ending Balance (24) [18],[19],[22] (15) [15],[16],[24]   (15) [15],[16],[24]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 2                        
Principal amount or par value 868 [18],[19],[21],[22] 868 [15],[16],[23],[24]   868 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (36)                      
Fair Value, Ending Balance (37) [18],[19],[22] (36) [15],[16],[24]   (36) [15],[16],[24]                
Investment, Identifier [Axis]: Spring Education Group, Inc (fka SSH Group Holdings, Inc.), Second lien                        
Principal amount or par value 21,959 [18],[20],[21] 21,959 [15],[23],[29]   21,959 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 21,324                      
Fair Value, Ending Balance 21,405 [18],[20] 21,324 [15],[29]   21,324 [15],[29]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien                        
Principal amount or par value 3,975 [18],[20],[21] 3,985 [15],[23],[29]   3,985 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 3,917                      
Fair Value, Ending Balance 3,931 [18],[20] 3,917 [15],[29]   3,917 [15],[29]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn                        
Principal amount or par value [15],[23],[24],[29]   2,791   2,791                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] 2,744                      
Fair Value, Ending Balance [15],[24],[29]   2,744   2,744                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn 1                        
Principal amount or par value [18],[20],[21],[22] 2,809                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[20],[22] 2,778                      
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn 2                        
Principal amount or par value [18],[19],[21],[22] 78                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 77                      
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 1                        
Principal amount or par value 127 [18],[20],[21],[22] 559 [15],[16],[23],[24]   559 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (9)                      
Fair Value, Ending Balance (1) [18],[20],[22] (9) [15],[16],[24]   (9) [15],[16],[24]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 2                        
Principal amount or par value 481 [18],[19],[21],[22] 152 [15],[23],[24],[29]   152 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] (3)                      
Fair Value, Ending Balance $ (5) [18],[19],[22] (3) [15],[24],[29]   $ (3) [15],[24],[29]                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares                        
Preferred equity variable rate margin 10.50%     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],[26] $ 11,396                      
Fair Value, Ending Balance 11,450 [18],[25] 11,396 [15],[26]   $ 11,396 [15],[26]                
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] 3,929                      
Fair Value, Ending Balance 3,947 [18],[19] 3,929 [15],[16]   3,929 [15],[16]                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                        
Principal amount or par value 22,500 [18],[21],[25] 22,500 [15],[23],[26]   22,500 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 21,067                      
Fair Value, Ending Balance 21,085 [18],[25] 21,067 [15],[26]   21,067 [15],[26]                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                        
Principal amount or par value 5,697 [18],[20],[21] 5,697 [15],[23],[29]   5,697 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 5,334                      
Fair Value, Ending Balance 5,339 [18],[20] 5,334 [15],[29]   5,334 [15],[29]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                        
Principal amount or par value 16,353 [18],[20],[21] 16,395 [15],[23],[29]   16,395 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 10,657                      
Fair Value, Ending Balance 10,840 [18],[20] 10,657 [15],[29]   10,657 [15],[29]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                        
Principal amount or par value 15,772 [18],[21],[27] 15,813 [15],[23],[28]   15,813 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 10,277                      
Fair Value, Ending Balance 10,453 [18],[27] 10,277 [15],[28]   10,277 [15],[28]                
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC), Second lien                        
Principal amount or par value 7,950 [18],[20],[21] 7,950 [15],[23],[29]   7,950 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 7,488                      
Fair Value, Ending Balance $ 7,472 [18],[20] 7,488 [15],[29]   $ 7,488 [15],[29]                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                        
Ordinary shares dividend rate 12.00%     12.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] $ 110,314                      
Fair Value, Ending Balance 111,419 [18],[19] 110,314 [15],[16]   $ 110,314 [15],[16]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien - Undrawn                        
Principal amount or par value 4,439 [18],[19],[21],[22] 4,439 [15],[16],[23],[24]   4,439 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24],[37] (71)                      
Fair Value, Ending Balance (23) [18],[19],[22] (71) [15],[16],[24],[37]   (71) [15],[16],[24],[37]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 1                        
Principal amount or par value 35,000 [18],[20],[21] 35,000 [15],[23],[29]   35,000 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 34,436                      
Fair Value, Ending Balance 34,821 [18],[20] 34,436 [15],[29]   34,436 [15],[29]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 2                        
Principal amount or par value 24,189 [18],[21],[27] 24,189 [15],[23],[28]   24,189 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 23,800                      
Fair Value, Ending Balance 24,067 [18],[27] 23,800 [15],[28]   23,800 [15],[28]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Drawn 1                        
Principal amount or par value   13,941   13,941                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                        
Principal amount or par value 15,889 15,562   15,562 £ 12,879 [18],[19],[21],[84]   £ 12,879 [15],[16],[23],[85]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[85] 15,562                      
Fair Value, Ending Balance 15,889 [18],[19],[84] 15,562 [15],[16],[85]   15,562 [15],[16],[85]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                        
Principal amount or par value | £         £ 10,538 [18],[19],[21],[84]   £ 10,538 [15],[16],[23],[85]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[85] 12,734                      
Fair Value, Ending Balance 13,002 [18],[19],[84] 12,734 [15],[16],[85]   12,734 [15],[16],[85]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2 and Tennessee Bidco Limited, First lien 5                        
Principal amount or par value 13,768                      
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                        
Principal amount or par value 10,184 [18],[19],[21] 10,184 [15],[16],[23]   10,184 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 10,184                      
Fair Value, Ending Balance 10,184 [18],[19] 10,184 [15],[16]   10,184 [15],[16]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                        
Principal amount or par value 6,246 [18],[19],[21] 6,246 [15],[16],[23]   6,246 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 6,246                      
Fair Value, Ending Balance 6,246 [18],[19] 6,246 [15],[16]   6,246 [15],[16]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                        
Principal amount or par value | €           € 708 [18],[19],[21],[84]   € 708 [15],[16],[23],[85]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[85] 757                      
Fair Value, Ending Balance 767 [18],[19],[84] 757 [15],[16],[85]   757 [15],[16],[85]                
Investment, Identifier [Axis]: The Kleinfelder Group, Inc., First lien                        
Principal amount or par value 16,489 [18],[21],[25] 16,533 [15],[23],[26]   16,533 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 16,241                      
Fair Value, Ending Balance 16,488 [18],[25] 16,241 [15],[26]   16,241 [15],[26]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                        
Principal amount or par value 29,868 [18],[21],[27] 29,868 [15],[23],[28]   29,868 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 29,151                      
Fair Value, Ending Balance 29,722 [18],[27] 29,151 [15],[28]   29,151 [15],[28]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                        
Principal amount or par value 556 [18],[20],[21],[22] 277 [15],[23],[24],[29]   277 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] 270                      
Fair Value, Ending Balance 553 [18],[20],[22] 270 [15],[24],[29]   270 [15],[24],[29]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                        
Principal amount or par value 1,683 [18],[20],[21],[22] 955 [15],[23],[24],[29]   955 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] (23)                      
Fair Value, Ending Balance (8) [18],[20],[22] (23) [15],[24],[29]   (23) [15],[24],[29]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                        
Principal amount or par value 4,267 [18],[19],[21],[22] 4,267 [15],[16],[23],[24]   4,267 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (102)                      
Fair Value, Ending Balance (21) [18],[19],[22] (102) [15],[16],[24]   (102) [15],[16],[24]                
Investment, Identifier [Axis]: Transcendia Holdings, Inc., Second lien                        
Principal amount or par value 14,500 [18],[21],[27] 14,500 [15],[23],[28]   14,500 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 12,418                      
Fair Value, Ending Balance 12,515 [18],[27] 12,418 [15],[28]   12,418 [15],[28]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien                        
Principal amount or par value 15,382 [18],[20],[21] 15,382 [15],[23],[29]   15,382 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 15,257                      
Fair Value, Ending Balance 15,257 [18],[20] 15,257 [15],[29]   15,257 [15],[29]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                        
Principal amount or par value 2,889 [18],[20],[21],[22] 2,889 [15],[23],[24],[29]   2,889 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] 2,865                      
Fair Value, Ending Balance 2,865 [18],[20],[22] 2,865 [15],[24],[29]   2,865 [15],[24],[29]                
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 [15],[16],[23],[24]   1,501 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (12)                      
Fair Value, Ending Balance (12) [18],[19],[22] (12) [15],[16],[24]   (12) [15],[16],[24]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                        
Principal amount or par value 2,364 [18],[20],[21],[22] 2,364 [15],[23],[24],[29]   2,364 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[29] (19)                      
Fair Value, Ending Balance (19) [18],[20],[22] (19) [15],[24],[29]   (19) [15],[24],[29]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                        
Principal amount or par value 893 [18],[19],[21],[22] 893 [15],[16],[23],[24]   893 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (29)                      
Fair Value, Ending Balance (26) [18],[19],[22] (29) [15],[16],[24]   (29) [15],[16],[24]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                        
Principal amount or par value 11,282 [18],[20],[21] 11,311 [15],[23],[29]   11,311 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 10,945                      
Fair Value, Ending Balance 10,952 [18],[20] 10,945 [15],[29]   10,945 [15],[29]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                        
Principal amount or par value 1,469 [18],[19],[21] 1,473 [15],[16],[23]   1,473 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 1,425                      
Fair Value, Ending Balance $ 1,426 [18],[19] 1,425 [15],[16]   1,425 [15],[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 [15],[23],[29]   22,367   22,367                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] $ 22,367                      
Fair Value, Ending Balance [15],[29]   22,367   22,367                
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 2                        
Principal amount or par value [15],[23],[29]   3,949   3,949                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 3,949                      
Fair Value, Ending Balance [15],[29]   3,949   3,949                
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                      
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],[20] 0 [15],[29]   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 [15],[16]   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] 11,626                      
Fair Value, Ending Balance $ 12,064 [18],[19],[87] 11,626 [15],[16],[86]   $ 11,626 [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] $ 7,670                      
Fair Value, Ending Balance 7,981 [18],[19],[87] 7,670 [15],[16],[86]   $ 7,670 [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],[74],[88] 6,491                      
Fair Value, Ending Balance 10,145 [18],[19],[72],[89] 6,491 [15],[16],[74],[88]   $ 6,491 [15],[16],[74],[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],[74],[90] 0                      
Fair Value, Ending Balance $ 0 [18],[20],[72],[91] 0 [15],[29],[74],[90]   $ 0 [15],[29],[74],[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],[74],[90] $ 0                      
Fair Value, Ending Balance 0 [18],[19],[72],[91] 0 [15],[16],[74],[90]   $ 0 [15],[16],[74],[90]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                        
Principal amount or par value 12,009 [18],[19],[21] 11,575 [15],[16],[23]   11,575 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 10,384                      
Fair Value, Ending Balance 10,864 [18],[19] 10,384 [15],[16]   10,384 [15],[16]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                        
Principal amount or par value 5,324 [18],[19],[21] 5,131 [15],[16],[23]   5,131 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16] 4,603                      
Fair Value, Ending Balance 4,816 [18],[19] 4,603 [15],[16]   4,603 [15],[16]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Senior preferred shares, Non-accrual status                        
Principal amount or par value                   $ 19,795    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance 10,145                      
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] 36,680                      
Fair Value, Ending Balance 45,870 [18],[19] 36,680 [15],[16]   36,680 [15],[16]                
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 1                        
Principal amount or par value 16,183 [18],[20],[21] 16,183 [15],[23],[29]   16,183 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 15,711                      
Fair Value, Ending Balance 15,568 [18],[20] 15,711 [15],[29]   15,711 [15],[29]                
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 2                        
Principal amount or par value 10,000 [18],[21],[25] 10,000 [15],[23],[26]   10,000 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 9,708                      
Fair Value, Ending Balance 9,620 [18],[25] 9,708 [15],[26]   9,708 [15],[26]                
Investment, Identifier [Axis]: Vectra Co., Second lien                        
Principal amount or par value 10,788 [18],[21],[27] 10,788 [15],[23],[28]   10,788 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 7,004                      
Fair Value, Ending Balance 7,647 [18],[27] 7,004 [15],[28]   7,004 [15],[28]                
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                        
Principal amount or par value 5,000 [19],[21] 5,000 [16],[23]   5,000 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [16] 3,817                      
Fair Value, Ending Balance 3,934 [19] 3,817 [16]   3,817 [16]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn                        
Principal amount or par value 9,688 [18],[20],[21],[22] 7,478 [15],[16],[23],[24]   7,478 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 7,430                      
Fair Value, Ending Balance 9,688 [18],[20],[22] 7,430 [15],[16],[24]   7,430 [15],[16],[24]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                        
Principal amount or par value 2,040 [18],[19],[21],[22] 2,040 [15],[16],[23],[24]   2,040 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (13)                      
Fair Value, Ending Balance 0 [18],[19],[22] (13) [15],[16],[24]   (13) [15],[16],[24]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                        
Principal amount or par value 6,114 [18],[20],[21],[22] 8,327 [15],[16],[23],[24]   8,327 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (53)                      
Fair Value, Ending Balance 0 [18],[20],[22] (53) [15],[16],[24]   (53) [15],[16],[24]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                        
Principal amount or par value 18,901 [18],[20],[21] 18,949 [15],[23],[29]   18,949 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 18,827                      
Fair Value, Ending Balance 18,901 [18],[20] 18,827 [15],[29]   18,827 [15],[29]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                        
Principal amount or par value 1,250 [18],[20],[21] 1,254 [15],[23],[29]   1,254 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 1,246                      
Fair Value, Ending Balance 1,250 [18],[20] 1,246 [15],[29]   1,246 [15],[29]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                        
Principal amount or par value 839 [18],[20],[21] 841 [15],[23],[29]   841 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 835                      
Fair Value, Ending Balance 839 [18],[20] 835 [15],[29]   835 [15],[29]                
Investment, Identifier [Axis]: Xactly Corporation, First lien                        
Principal amount or par value 22,500 [18],[21],[25] 19,047 [15],[23],[26]   19,047 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[26] 19,047                      
Fair Value, Ending Balance 22,500 [18],[25] 19,047 [15],[26]   19,047 [15],[26]                
Investment, Identifier [Axis]: Xactly Corporation, First lien - Drawn                        
Principal amount or par value [15],[16],[23],[24]   992   992                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] 992                      
Fair Value, Ending Balance [15],[16],[24]   992   992                
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                        
Principal amount or par value [18],[19],[21],[22] 992                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] 0                      
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn                        
Principal amount or par value 794 [18],[19],[21],[22] 495 [15],[23],[24],[42]   495 [15],[23],[24],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[42] 482                      
Fair Value, Ending Balance 771 [18],[19],[22] 482 [15],[24],[42]   482 [15],[24],[42]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn                        
Principal amount or par value [15],[23],[24],[42]   1,584   1,584                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[42] (41)                      
Fair Value, Ending Balance [15],[24],[42]   (41)   (41)                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                        
Principal amount or par value [18],[21],[22],[41] 1,283                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[22],[41] (37)                      
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                        
Principal amount or par value [18],[19],[21],[22] 3,968                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Ending Balance [18],[19],[22] (115)                      
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 1                        
Principal amount or par value 17,815 [18],[21],[41] 17,861 [15],[23],[42]   17,861 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 17,393                      
Fair Value, Ending Balance 17,297 [18],[41] 17,393 [15],[42]   17,393 [15],[42]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 2                        
Principal amount or par value 2,320 [18],[21],[41] 2,326 [15],[23],[42]   2,326 [15],[23],[42]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[42] 2,265                      
Fair Value, Ending Balance 2,253 [18],[41] 2,265 [15],[42]   2,265 [15],[42]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien) - Undrawn                        
Principal amount or par value [15],[16],[23],[24]   3,968   3,968                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (104)                      
Fair Value, Ending Balance [15],[16],[24]   (104)   (104)                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                        
Principal amount or par value 11,310 [18],[21],[22],[27] 11,763 [15],[23],[24],[28]   11,763 [15],[23],[24],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[24],[28] 0                      
Fair Value, Ending Balance 0 [18],[22],[27] 0 [15],[24],[28]   0 [15],[24],[28]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                        
Principal amount or par value 4,218 [18],[19],[21],[22] 4,218 [15],[16],[23],[24]   4,218 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[16],[24] (37)                      
Fair Value, Ending Balance (23) [18],[19],[22] (37) [15],[16],[24]   (37) [15],[16],[24]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                        
Principal amount or par value 44,740 [18],[21],[27] 44,287 [15],[23],[28]   44,287 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[28] 43,901                      
Fair Value, Ending Balance 44,498 [18],[27] 43,901 [15],[28]   43,901 [15],[28]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                        
Principal amount or par value 7,366 [18],[20],[21] 7,366 [15],[23],[29]   7,366 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, Beginning Balance [15],[29] 7,311                      
Fair Value, Ending Balance $ 7,365 [18],[20] $ 7,311 [15],[29]   $ 7,311 [15],[29]                
[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, 2022 and December 31, 2021 along with transactions during the year ended December 31, 2022 in which the issuer was a non-controlled/affiliated investment is as follows:
Portfolio CompanyFair Value at December 31, 2021Gross
Additions (A)		Gross
Redemptions
(B)		Net Change In Unrealized Appreciation (Depreciation)Fair Value at December 31, 2022Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Permian Holdco 3, Inc. / Permian Trust$— $— $— $— $— $— $— $— $— 
Sierra Hamilton Holdings Corporation4,000 — — — 4,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC130,775 5,168 — (9,156)126,787 — 2,105 4,109 250 
Total Non-Controlled/Affiliated Investments$134,775 $5,168 $— $(9,156)$130,787 $— $2,105 $4,109 $250 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement at fair value of an existing portfolio company into this category from a different category.
(B)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[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 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 March 31, 2023 and December 31, 2022 along with transactions during the nine months ended March 31, 2023 in which the issuer was a non-controlled/affiliated investment is as follows:
Portfolio CompanyFair Value at December 31, 2022Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at March 31, 2023Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC$— $15,582 $(459)$(11)$15,112 $— $4 $— $— 
Permian Holdco 3, Inc. / Permian Trust— — — — — — — — — 
Sierra Hamilton Holdings Corporation4,000 — — — 4,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC126,787 1,807 — (5)128,589 — 696 1,105 63 
Total Non-Controlled/Affiliated Investments$130,787 $17,389 $(459)$(16)$147,701 $— $700 $1,105 $63 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind ("PIK") interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[9] Denotes investments in which the Company is in “Control”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of December 31, 2022 and December 31, 2021 along with transactions during the year ended December 31, 2022 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2021Gross
Additions
(A)		Gross
Redemptions
(B)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2022Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Edmentum Inc.$— $— $— $— $— $54 $— $— $— 
National HME, Inc./NHME Holdings Corp.27,347 (8,161)— (13,805)5,381 — (9,661)— (1,500)
New Benevis Topco, LLC / New Benevis Holdco, Inc.109,595 5,914 — (1,363)114,146 — 8,057 — 1,500 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.34,759 7,805 — 15,000 57,564 — 4,504 — 511 
NM APP CANADA CORP9,422 — (7,345)(2,077)— 4,212 — 620 713 
NM APP US LLC14,891 — (5,080)(9,811)— 4,489 — 255 483 
NM CLFX LP24,676 — — (8,504)16,172 — — 1,596 — 
NM DRVT LLC7,984 — (5,152)(2,832)— 3,439 — 173 475 
NM JRA LLC3,996 — (2,043)(1,953)— 2,049 — 72 188 
NM GLCR LP50,687 — (14,750)(35,937)— 35,713 — 400 2,150 
NM KRLN LLC244 97 (9,319)8,978 — (9,318)— — — 
NM NL Holdings, L.P.107,870 53 (10,885)(2,733)94,305 — — 8,453 — 
NM GP Holdco, LLC1,197 1 (138)(32)1,028 — — 94 — 
NM YI LLC8,286 — — 1,195 9,481 — — 828 — 
NMFC Senior Loan Program III LLC140,000 — — — 140,000 — — 17,485 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 13,173 — 
Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC 34,821 3,865 (38,685)35,787 35,788 12,802 6,316 — 1,902 
UniTek Global Services, Inc.67,635 13,378 (1,549)24,306 103,770 — 4,738 4,363 724 
Total Controlled Investments$755,810 $22,952 $(94,946)$6,219 $690,035 $53,440 $13,954 $47,512 $7,146 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[10] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[11] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[12] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[13] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[14] Denotes investments in which the Company is in “Control”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of March 31, 2023 and December 31, 2022, along with transactions during the three months ended March 31, 2023 in which the issuer was a controlled investment, is as follows:
Portfolio Company (1)Fair Value at December 31, 2022Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at March 31, 2023Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
National HME, Inc./NHME Holdings Corp.$5,381 $— $(17,404)$17,023 $5,000 $(17,404)$— $— $— 
New Benevis Topco, LLC / New Benevis Holdco, Inc.114,146 10,235 — (320)124,061 — 2,563 — 375 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.57,564 1,312 — — 58,876 — 1,333 — 129 
NM APP CANADA CORP— — — — — — — — — 
NM APP US LLC— — — — — — — — — 
NM CLFX LP16,172 — — (735)15,437 — — 393 — 
NM DRVT LLC— — — — — — — — — 
NM JRA LLC— — — — — — — — — 
NM GLCR LP— — — — — — — — — 
NM KRLN LLC— — — — — — — — — 
NM NL Holdings, L.P.94,305 — — 271 94,576 — — 2,318 — 
NM GP Holdco, LLC1,028 — — 1 1,029 — — 26 — 
NM YI LLC9,481 — — 100 9,581 — — 214 — 
NMFC Senior Loan Program III LLC140,000 — — — 140,000 — — 4,462 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 3,583 — 
Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC 35,788 — — (19,397)16,391 19,375 — — 510 
UniTek Global Services, Inc.103,770 2,563 (26,445)11,854 91,740 2 1,936 1,229 181 
Total Controlled Investments$690,035 $14,110 $(43,849)$8,797 $669,091 $1,973 $5,832 $12,225 $1,195 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[15] 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] 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.
[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] Par amount is denominated in United States Dollar unless otherwise noted, British Pound ("£") and/or Euro ("€").
[24] 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.
[25] Investment is held in New Mountain Finance SBIC, L.P.
[26] Investment is held in New Mountain Finance SBIC, L.P.
[27] 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.
[28] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[29] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[30] 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] 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.
[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 11.0% per annum.
[36] The Company holds investments in two wholly-owned subsidiaries of Appriss Health Holdings, Inc. The company holds a first lien term loan and a first lien revolver in Appriss Health, LLC, and preferred equity in Appriss Health Intermediate Holdings, Inc. The preferred equity is entitled to receive preferential dividends at a rate of 11.00% per annum.
[37] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2022, 15.3% 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 March 31, 2023, 15.3% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[39] The Company holds preferred equity in Bach Special Limited (Bach Preference Limited) that is entitled to receive cumulative preferential dividends at a rate of 12.25% per annum payable in additional shares.
[40] The Company holds preferred equity in Bach Special Limited (Bach Preference Limited) that is entitled to receive cumulative preferential dividends at a rate of 12.25% per annum payable in additional shares.
[41] Investment is held in New Mountain Finance SBIC II, L.P.
[42] Investment is held in New Mountain Finance SBIC II, L.P.
[43] The Company holds preferred equity in Dealer Tire Holdings, LLC that is entitled to receive cumulative preferential dividends at a rate of 7.00% per annum.
[44] The Company holds preferred equity in Dealer Tire Holdings, LLC that is entitled to receive cumulative preferential dividends at a rate of 7.0% 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 10.50% per annum.
[46] The Company holds investments in two wholly-owned subsidiary of Diamond Parent Holdings Corp. The Company holds three first lien term loans and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The preferred equity in Diligent Preferred Issuer Inc. is entitled to receive cumulative preferential dividends at a rate 10.5% 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 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.
[49] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and two first lien delayed draws in FS WhiteWater Borrwer, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[50] Investment is held in NMF HB, Inc
[51] The Company holds preferred equity in HB Wealth Management, LLC that is entitled to receive cumulative preferential dividends at a rate of 4.00% per annum.
[52] Investment is held in NMF HB, Inc.
[53] The Company holds preferred equity in HB Wealth Management, LLC that is entitled to receive cumulative preferential dividends at a rate of 4.0% per annum.
[54] Investment is held in NMF TRM, LLC.
[55] Investment is held in NMF TRM, LLC.
[56] Investment is held in NMF QID NGL Holdings, Inc.
[57] Investment is held in NMF QID NGL Holdings, Inc.
[58] 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% 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 first lien revolver in Haven Midstream Holdings LLC.
[59] 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.
[60] 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
[61] 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.
[62] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as Tranche A Term Loan and Tranche B Term Loan in National HME, Inc., a whollyowned subsidiary of NHME Holdings Corp.
[63] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp.
[64] Investment is held in New Mountain Net Lease Corporation.
[65] Investment is held in New Mountain Net Lease Corporation.
[66] The Company holds ordinary shares in OA Topco, L.P., and a first lien term loan and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[67] 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.
[68] Investment is held in NMF OEC, Inc.
[69] 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.
[70] Investment is held in NMF OEC, Inc.
[71] 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.
[72] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[73] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,539 as of March 31, 2023. See Note 2. Summary of Significant Accounting Policies, for details.
[74] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[75] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,539 as of December 31, 2022. See Note 2. Summary of Significant Accounting Policies, for details.
[76] Investment is held in NMF Permian Holdings, LLC.
[77] Investment is held in NMF Permian Holdings, LLC
[78] 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.
[79] 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.
[80] Investment is held in NMF Pioneer, Inc
[81] Investment is held in NMF Pioneer, Inc.
[82] 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.
[83] 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.
[84] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of March 31, 2023, the par value U.S. dollar equivalent of the first lien term loan, and drawn first lien term loan is $15,889, and $13,768, 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 December 31, 2022, the par value U.S. dollar equivalent of the first lien term loan and drawn first lien term loan is $15,562 and $13,941, respectively. See Note 2. Summary of Significant Accounting Policies, for details
[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.