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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
investment
agreement
Dec. 31, 2022
USD ($)
investment
agreement
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
investment
agreement
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
investment
agreement
Jun. 30, 2023
GBP (£)
investment
agreement
Jun. 30, 2023
EUR (€)
investment
agreement
Dec. 31, 2022
GBP (£)
investment
agreement
Dec. 31, 2022
EUR (€)
investment
agreement
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | agreement 1 1   1   1 1 1 1 1      
Cost basis of securities purchased under collateralized agreements to resell $ 30,000 $ 30,000   $ 30,000   $ 30,000              
Fair value of securities purchased under collateralized agreements to resell 16,500 16,539   16,500   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) (7,284)   $ (32,967) (1,406) $ (43,322)                
Fair Value, Ending Balance 3,179,465 [2] $ 3,221,247 [1]   3,179,465 [2]   $ 3,221,247 [1]              
Net Realized Gains (Losses) $ 2,567   16,558 $ 3,244 36,075                
Investments at fair value that are non-qualifying assets as a percentage of total assets 15.80% 15.30%   15.80%   15.30% 15.80% 15.80% 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 $ 5,338   4,360 $ 9,800 8,998                
NMFC Senior Loan Program IV LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Dividend Income 4,145   2,987 7,728 6,359                
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       18,947 [4]   5,168 [5]              
Gross Redemptions       (459) [6]   0 [7]              
Net Change In Unrealized Appreciation (Depreciation)       (15)   (9,156)              
Fair Value, Ending Balance 149,260 [8] $ 130,787 [3]   149,260 [8]   130,787 [3]              
Net Realized Gains (Losses)       0   0              
Interest Income       1,797   2,105              
Dividend Income       2,244   4,109              
Other Income 63   62 126 125 250              
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]       15,581                  
Gross Redemptions [6]       (459)                  
Net Change In Unrealized Appreciation (Depreciation)       (11)                  
Fair Value, Ending Balance 15,111 0   15,111   0              
Net Realized Gains (Losses)       0                  
Interest Income       354                  
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   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       2 [4]   0 [5]              
Gross Redemptions       0 [6]   0 [7]              
Net Change In Unrealized Appreciation (Depreciation)       5   0              
Fair Value, Ending Balance 4,007 4,000   4,007   4,000              
Net Realized Gains (Losses)       0   0              
Interest Income       2   0              
Dividend Income       0   0              
Other Income       1   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       3,364 [4]   5,168 [5]              
Gross Redemptions       0 [6]   0 [7]              
Net Change In Unrealized Appreciation (Depreciation)       (9)   (9,156)              
Fair Value, Ending Balance 130,142 126,787   130,142   126,787              
Net Realized Gains (Losses)       0   0              
Interest Income       1,441   2,105              
Dividend Income       2,244   4,109              
Other Income       125   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       20,791 [10]   22,952 [11]              
Gross Redemptions       (44,109) [12]   (94,946) [13]              
Net Change In Unrealized Appreciation (Depreciation)       (691)   6,219              
Fair Value, Ending Balance 666,026 [14] 690,035 [9]   666,026 [14]   690,035 [9]              
Net Realized Gains (Losses)       11,853   53,440              
Interest Income       10,761   13,954              
Dividend Income       25,660   47,512              
Other Income 1,375   2,395 2,570 5,014 7,146              
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)       (29,094)   35,787              
Fair Value, Ending Balance 6,694 35,788   6,694   35,788              
Net Realized Gains (Losses)       29,255   12,802              
Interest Income       0   6,316              
Dividend Income       0   0              
Other Income       1,020   1,902              
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   5,000   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       13,096 [10]   5,914 [11]              
Gross Redemptions       0 [12]   0 [13]              
Net Change In Unrealized Appreciation (Depreciation)       (509)   (1,363)              
Fair Value, Ending Balance 126,733 114,146   126,733   114,146              
Net Realized Gains (Losses)       0   0              
Interest Income       5,424   8,057              
Dividend Income       0   0              
Other Income       750   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       3,183 [10]   7,805 [11]              
Gross Redemptions       0 [12]   0 [13]              
Net Change In Unrealized Appreciation (Depreciation)       0   15,000              
Fair Value, Ending Balance 60,747 57,564   60,747   57,564              
Net Realized Gains (Losses)       0   0              
Interest Income       2,744   4,504              
Dividend Income       0   0              
Other Income       256   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)       7   (2,077)              
Fair Value, Ending Balance 7 0   7   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 [11]           0              
Gross Redemptions [13]           (5,080)              
Net Change In Unrealized Appreciation (Depreciation)           (9,811)              
Fair Value, Ending Balance   0       0              
Net Realized Gains (Losses)           4,489              
Interest Income           0              
Dividend Income           255              
Other Income           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       (259) [12]   0 [13]              
Net Change In Unrealized Appreciation (Depreciation)       (1,848)   (8,504)              
Fair Value, Ending Balance 14,065 16,172   14,065   16,172              
Net Realized Gains (Losses)       0   0              
Interest Income       0   0              
Dividend Income       858   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 [11]           0              
Gross Redemptions [13]           (5,152)              
Net Change In Unrealized Appreciation (Depreciation)           (2,832)              
Fair Value, Ending Balance   0       0              
Net Realized Gains (Losses)           3,439              
Interest Income           0              
Dividend Income           173              
Other Income           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 [11]           0              
Gross Redemptions [13]           (2,043)              
Net Change In Unrealized Appreciation (Depreciation)           (1,953)              
Fair Value, Ending Balance   0       0              
Net Realized Gains (Losses)           2,049              
Interest Income           0              
Dividend Income           72              
Other Income           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 [11]           0              
Gross Redemptions [13]           (14,750)              
Net Change In Unrealized Appreciation (Depreciation)           (35,937)              
Fair Value, Ending Balance   0       0              
Net Realized Gains (Losses)           35,713              
Interest Income           0              
Dividend Income           400              
Other Income           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 [11]           97              
Gross Redemptions [13]           (9,319)              
Net Change In Unrealized Appreciation (Depreciation)           8,978              
Fair Value, Ending Balance   0       0              
Net Realized Gains (Losses)           (9,318)              
Interest Income           0              
Dividend Income           0              
Other Income           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)       1,467   (2,733)              
Fair Value, Ending Balance 95,772 94,305   95,772   94,305              
Net Realized Gains (Losses)       0   0              
Interest Income       0   0              
Dividend Income       4,285   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)       13   (32)              
Fair Value, Ending Balance 1,041 1,028   1,041   1,028              
Net Realized Gains (Losses)       0   0              
Interest Income       0   0              
Dividend Income       42   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)       (17)   1,195              
Fair Value, Ending Balance 9,464 9,481   9,464   9,481              
Net Realized Gains (Losses)       0   0              
Interest Income       0   0              
Dividend Income       425   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   140,000              
Net Realized Gains (Losses)       0   0              
Interest Income       0   0              
Dividend Income       9,800   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   112,400              
Net Realized Gains (Losses)       0   0              
Interest Income       0   0              
Dividend Income       7,728   13,173              
Other Income       0   0              
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       4,512 [10]   13,378 [11]              
Gross Redemptions       (26,446) [12]   (1,549) [13]              
Net Change In Unrealized Appreciation (Depreciation)       12,267   24,306              
Fair Value, Ending Balance 94,103 103,770   94,103   103,770              
Net Realized Gains (Losses)       2   0              
Interest Income       2,593   4,738              
Dividend Income       2,522   4,363              
Other Income       544   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],[20] 0 [15],[16],[17]   0 [18],[19],[20]   0 [15],[16],[17]              
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 1                          
Principal amount or par value 20,904 [18],[21],[22],[23] 12,357 [15],[16],[24],[25]   20,904 [18],[21],[22],[23]   12,357 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       12,204                  
Fair Value, Ending Balance 20,883 [18],[21],[23] 12,204 [15],[16],[25]   20,883 [18],[21],[23]   12,204 [15],[16],[25]              
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 2                          
Principal amount or par value 6,782 [18],[22],[23],[26] 4,009 [15],[24],[25],[27]   6,782 [18],[22],[23],[26]   4,009 [15],[24],[25],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[27]       3,959                  
Fair Value, Ending Balance 6,775 [18],[23],[26] 3,959 [15],[25],[27]   6,775 [18],[23],[26]   3,959 [15],[25],[27]              
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                          
Principal amount or par value [15],[24],[25],[27]   4,231       4,231              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[27]       (52)                  
Fair Value, Ending Balance [15],[25],[27]   (52)       (52)              
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 1                          
Principal amount or par value 1,434 [18],[22],[23],[26] 3,659 [15],[16],[24],[25]   1,434 [18],[22],[23],[26]   3,659 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (45)                  
Fair Value, Ending Balance (1) [18],[23],[26] (45) [15],[16],[25]   (1) [18],[23],[26]   (45) [15],[16],[25]              
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 2                          
Principal amount or par value 3,659 [18],[19],[22],[23] 13,041 [15],[16],[24],[25]   3,659 [18],[19],[22],[23]   13,041 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (162)                  
Fair Value, Ending Balance (4) [18],[19],[23] (162) [15],[16],[25]   (4) [18],[19],[23]   (162) [15],[16],[25]              
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 3                          
Principal amount or par value [18],[21],[22],[23] 4,421     4,421                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21],[23] (4)     (4)                  
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                          
Principal amount or par value 20,530 [18],[22],[28] 20,634 [15],[24],[29]   20,530 [18],[22],[28]   20,634 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       20,378                  
Fair Value, Ending Balance 20,510 [18],[28] 20,378 [15],[29]   20,510 [18],[28]   20,378 [15],[29]              
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                          
Principal amount or par value 9,748 [18],[22],[26] 9,797 [15],[24],[27]   9,748 [18],[22],[26]   9,797 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       9,676                  
Fair Value, Ending Balance 9,738 [18],[26] 9,676 [15],[27]   9,738 [18],[26]   9,676 [15],[27]              
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                          
Principal amount or par value 13,231 [18],[19],[22] 12,494 [15],[16],[24]   13,231 [18],[19],[22]   12,494 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       11,908                  
Fair Value, Ending Balance 12,372 [18],[19] 11,908 [15],[16]   12,372 [18],[19]   11,908 [15],[16]              
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                          
Principal amount or par value 5,189 [18],[22],[26] 4,900 [15],[24],[27]   5,189 [18],[22],[26]   4,900 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       4,670                  
Fair Value, Ending Balance 4,852 [18],[26] 4,670 [15],[27]   4,852 [18],[26]   4,670 [15],[27]              
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien                          
Principal amount or par value 22,110 [18],[21],[22] 22,082 [15],[24],[30]   22,110 [18],[21],[22]   22,082 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       21,338                  
Fair Value, Ending Balance 21,445 [18],[21] 21,338 [15],[30]   21,445 [18],[21]   21,338 [15],[30]              
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                          
Principal amount or par value [18],[19],[22],[23] 3,919     3,919                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 3,801     3,801                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 1                          
Principal amount or par value [15],[16],[24],[25]   2,840       2,840              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       2,744                  
Fair Value, Ending Balance [15],[16],[25]   2,744       2,744              
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 2                          
Principal amount or par value [15],[16],[24],[25]   259       259              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       250                  
Fair Value, Ending Balance [15],[16],[25]   250       250              
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                          
Principal amount or par value 2,354 [18],[19],[22],[23] 2,095 [15],[16],[24],[25]   2,354 [18],[19],[22],[23]   2,095 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (71)                  
Fair Value, Ending Balance (71) [18],[19],[23] (71) [15],[16],[25]   (71) [18],[19],[23]   (71) [15],[16],[25]              
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                          
Principal amount or par value 4,310 [18],[19],[22],[23] 5,386 [15],[16],[24],[25]   4,310 [18],[19],[22],[23]   5,386 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (181)                  
Fair Value, Ending Balance (130) [18],[19],[23] (181) [15],[16],[25]   $ (130) [18],[19],[23]   $ (181) [15],[16],[25]              
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],[31]       $ 14,068                  
Fair Value, Ending Balance 14,828 [18],[19],[32] 14,068 [15],[16],[31]   14,828 [18],[19],[32]   $ 14,068 [15],[16],[31]              
Investment, Identifier [Axis]: ADG, LLC, Second lien                          
Principal amount or par value [15],[16],[24]   7,430       7,430              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       4,984                  
Fair Value, Ending Balance [15],[16]   4,984       4,984              
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                          
Principal amount or par value 13,444 [18],[22],[28] 13,444 [15],[24],[29]   13,444 [18],[22],[28]   13,444 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       13,444                  
Fair Value, Ending Balance 13,444 [18],[28] 13,444 [15],[29]   13,444 [18],[28]   13,444 [15],[29]              
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Drawn                          
Principal amount or par value [18],[19],[22],[23] 2,176     2,176                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 2,176     2,176                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 1                          
Principal amount or par value 1,969 [18],[19],[22],[23] 1,969 [15],[16],[24],[25]   1,969 [18],[19],[22],[23]   1,969 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (39)                  
Fair Value, Ending Balance 0 [18],[19],[23] (39) [15],[16],[25]   0 [18],[19],[23]   (39) [15],[16],[25]              
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 2                          
Principal amount or par value 9,536 [18],[19],[22],[23] 11,718 [15],[16],[24],[25]   9,536 [18],[19],[22],[23]   11,718 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (234)                  
Fair Value, Ending Balance 0 [18],[19],[23] (234) [15],[16],[25]   0 [18],[19],[23]   (234) [15],[16],[25]              
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                          
Principal amount or par value 22,209 [18],[21],[22] 22,321 [15],[24],[30]   22,209 [18],[21],[22]   22,321 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       21,875                  
Fair Value, Ending Balance 22,209 [18],[21] 21,875 [15],[30]   22,209 [18],[21]   21,875 [15],[30]              
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                          
Principal amount or par value 4,003 [18],[21],[22] 4,024 [15],[24],[30]   4,003 [18],[21],[22]   4,024 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       3,943                  
Fair Value, Ending Balance 4,003 [18],[21] 3,943 [15],[30]   4,003 [18],[21]   3,943 [15],[30]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                          
Principal amount or par value $ 31,239     $ 31,239                  
Number of investments held | investment 2     2     2 2          
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                          
Principal amount or par value $ 2,652 [18],[19],[22],[23] 2,652 [15],[16],[24],[25]   $ 2,652 [18],[19],[22],[23]   2,652 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[17],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[20],[23] 0 [15],[16],[17],[25]   0 [18],[19],[20],[23]   0 [15],[16],[17],[25]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                          
Principal amount or par value 29,712 [18],[21],[22] 28,829 [15],[24],[30]   29,712 [18],[21],[22]   28,829 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       20,599                  
Fair Value, Ending Balance 20,420 [18],[21] 20,599 [15],[30]   20,420 [18],[21]   20,599 [15],[30]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                          
Principal amount or par value 1,527 [18],[19],[22] 1,527 [15],[16],[24]   1,527 [18],[19],[22]   1,527 [15],[16],[24]              
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 [18],[19]   0 [15],[16]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                          
Principal amount or par value                     $ 13,412    
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 8,168     8,168                  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                          
Principal amount or par value 5,230 [18],[19],[22] 5,230 [15],[16],[24]   5,230 [18],[19],[22]   5,230 [15],[16],[24]              
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 [18],[19]   0 [15],[16]              
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated, Non-accrual status                          
Principal amount or par value                       $ 5,230  
Investment, Identifier [Axis]: Anaplan, Inc., First lien                          
Principal amount or par value 8,618 [18],[21],[22] 33,618 [15],[24],[30]   8,618 [18],[21],[22]   33,618 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       33,282                  
Fair Value, Ending Balance 8,618 [18],[21] 33,282 [15],[30]   8,618 [18],[21]   33,282 [15],[30]              
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 [18],[34]   158 [15],[33]              
Investment, Identifier [Axis]: Ansira Holdings, Inc, First lien - Undrawn                          
Principal amount or par value 1,161 [18],[19],[22],[23] 1,161 [15],[16],[24],[25]   1,161 [18],[19],[22],[23]   1,161 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[23] 0 [15],[16],[25]   0 [18],[19],[23]   0 [15],[16],[25]              
Investment, Identifier [Axis]: Ansira Holdings, Inc.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance 3,497     3,497                  
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien - Drawn                          
Principal amount or par value 362 [18],[19],[22],[23] 313 [15],[16],[24],[25]   362 [18],[19],[22],[23]   313 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       313                  
Fair Value, Ending Balance 362 [18],[19],[23] 313 [15],[16],[25]   362 [18],[19],[23]   313 [15],[16],[25]              
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 1                          
Principal amount or par value 32,809 [18],[19],[22] 32,953 [15],[24],[29]   32,809 [18],[19],[22]   32,953 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       14,829                  
Fair Value, Ending Balance 2,792 [18],[19] 14,829 [15],[29]   2,792 [18],[19]   14,829 [15],[29]              
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 2                          
Principal amount or par value 8,280 [18],[19],[22] 8,316 [15],[16],[24]   8,280 [18],[19],[22]   8,316 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       3,742                  
Fair Value, Ending Balance $ 705 [18],[19] $ 3,742 [15],[16]   $ 705 [18],[19]   $ 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 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 $ 2,719 [18],[19],[35] $ 2,628 [15],[16]   2,719 [18],[19],[35]   $ 2,628 [15],[16]              
Investment, Identifier [Axis]: Appriss Health, LLC, First lien                          
Principal amount or par value 6,219 [18],[22],[28] 6,234 [15],[24],[29]   6,219 [18],[22],[28]   6,234 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29],[36]       6,234                  
Fair Value, Ending Balance 6,219 [18],[28] 6,234 [15],[29],[36]   6,219 [18],[28]   6,234 [15],[29],[36]              
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                          
Principal amount or par value 417 [18],[19],[22],[23] 417 [15],[16],[24],[25]   417 [18],[19],[22],[23]   417 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25],[36]       0                  
Fair Value, Ending Balance 0 [18],[19],[23],[35] 0 [15],[16],[25],[36]   0 [18],[19],[23],[35]   0 [15],[16],[25],[36]              
Investment, Identifier [Axis]: Apptio, Inc., First lien - Drawn                          
Principal amount or par value 620 [18],[19],[22],[23] 1,240 [15],[16],[24],[25]   620 [18],[19],[22],[23]   1,240 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       1,240                  
Fair Value, Ending Balance 620 [18],[19],[23] 1,240 [15],[16],[25]   620 [18],[19],[23]   1,240 [15],[16],[25]              
Investment, Identifier [Axis]: Apptio, Inc., First lien - Undrawn                          
Principal amount or par value 1,446 [18],[19],[22],[23] 827 [15],[16],[24],[25]   1,446 [18],[19],[22],[23]   827 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[23] 0 [15],[16],[25]   0 [18],[19],[23]   0 [15],[16],[25]              
Investment, Identifier [Axis]: Apptio, Inc., First lien 1                          
Principal amount or par value 5,703 [18],[22],[28] 5,703 [15],[24],[29]   5,703 [18],[22],[28]   5,703 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       5,703                  
Fair Value, Ending Balance 5,703 [18],[28] 5,703 [15],[29]   5,703 [18],[28]   5,703 [15],[29]              
Investment, Identifier [Axis]: Apptio, Inc., First lien 2                          
Principal amount or par value 5,500 [18],[21],[22] 5,500 [15],[24],[30]   5,500 [18],[21],[22]   5,500 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       5,500                  
Fair Value, Ending Balance 5,500 [18],[21] 5,500 [15],[30]   5,500 [18],[21]   5,500 [15],[30]              
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                          
Principal amount or par value 3,543 [18],[19],[22],[23] 3,543 [15],[16],[24],[25]   3,543 [18],[19],[22],[23]   3,543 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[23] 0 [15],[16],[25]   0 [18],[19],[23]   0 [15],[16],[25]              
Investment, Identifier [Axis]: Associations, Inc., First lien 1                          
Principal amount or par value 36,239 [18],[21],[22] 35,786 [15],[24],[30]   36,239 [18],[21],[22]   35,786 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       35,786                  
Fair Value, Ending Balance 36,239 [18],[21] 35,786 [15],[30]   36,239 [18],[21]   35,786 [15],[30]              
Investment, Identifier [Axis]: Associations, Inc., First lien 2                          
Principal amount or par value 8,921 [18],[22],[28] 8,810 [15],[24],[29]   8,921 [18],[22],[28]   8,810 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       8,810                  
Fair Value, Ending Balance 8,921 [18],[28] 8,810 [15],[29]   8,921 [18],[28]   8,810 [15],[29]              
Investment, Identifier [Axis]: Associations, Inc., First lien 3                          
Principal amount or par value 8,921 [18],[21],[22] 8,810 [15],[24],[30]   8,921 [18],[21],[22]   8,810 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       8,810                  
Fair Value, Ending Balance 8,921 [18],[21] 8,810 [15],[30]   8,921 [18],[21]   8,810 [15],[30]              
Investment, Identifier [Axis]: Associations, Inc., First lien 4                          
Principal amount or par value 5,388 [18],[22],[28] 5,321 [15],[24],[29]   5,388 [18],[22],[28]   5,321 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       5,321                  
Fair Value, Ending Balance 5,388 [18],[28] 5,321 [15],[29]   5,388 [18],[28]   5,321 [15],[29]              
Investment, Identifier [Axis]: Associations, Inc., First lien 5                          
Principal amount or par value 4,286 [18],[22],[28] 4,233 [15],[24],[29]   4,286 [18],[22],[28]   4,233 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       4,233                  
Fair Value, Ending Balance 4,286 [18],[28] 4,233 [15],[29]   4,286 [18],[28]   4,233 [15],[29]              
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                          
Principal amount or par value 34,459 [18],[22],[28] 34,459 [15],[24],[29]   34,459 [18],[22],[28]   34,459 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29],[37]       34,356                  
Fair Value, Ending Balance 34,459 [18],[28],[38] 34,356 [15],[29],[37]   34,459 [18],[28],[38]   34,356 [15],[29],[37]              
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien                          
Principal amount or par value 3,454 [18],[21],[22] 3,454 [24],[30]   3,454 [18],[21],[22]   3,454 [24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [30],[37]       3,402                  
Fair Value, Ending Balance 3,454 [18],[21],[38] 3,402 [30],[37]   3,454 [18],[21],[38]   3,402 [30],[37]              
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                          
Principal amount or par value 320 [18],[19],[22],[23] 320 [16],[24],[25]   320 [18],[19],[22],[23]   320 [16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [16],[25],[37]       (5)                  
Fair Value, Ending Balance 0 [18],[19],[23],[38] (5) [16],[25],[37]   0 [18],[19],[23],[38]   (5) [16],[25],[37]              
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                          
Principal amount or par value 21,958 [18],[22],[28] 22,069 [15],[24],[29]   21,958 [18],[22],[28]   22,069 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       21,694                  
Fair Value, Ending Balance 21,958 [18],[28] 21,694 [15],[29]   21,958 [18],[28]   21,694 [15],[29]              
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                          
Principal amount or par value 14,850 [18],[21],[22] 14,925 [15],[24],[30]   14,850 [18],[21],[22]   14,925 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       14,671                  
Fair Value, Ending Balance 14,850 [18],[21] 14,671 [15],[30]   14,850 [18],[21]   14,671 [15],[30]              
Investment, Identifier [Axis]: Avalara, Inc., First lien                          
Principal amount or par value [18],[22],[28] 17,198     17,198                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[28] 17,198     17,198                  
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                          
Principal amount or par value 1,720 [18],[19],[22],[23] 3,538 [15],[16],[24],[25]   1,720 [18],[19],[22],[23]   3,538 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (30)                  
Fair Value, Ending Balance 0 [18],[19],[23] (30) [15],[16],[25]   0 [18],[19],[23]   (30) [15],[16],[25]              
Investment, Identifier [Axis]: Avalara, Inc., First lien 1                          
Principal amount or par value [15],[24],[29]   22,500       22,500              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       22,307                  
Fair Value, Ending Balance [15],[29]   22,307       22,307              
Investment, Identifier [Axis]: Avalara, Inc., First lien 2                          
Principal amount or par value [15],[24],[30]   12,880       12,880              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       $ 12,769                  
Fair Value, Ending Balance [15],[30]   12,769       $ 12,769              
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 10,897 [18],[19],[38],[40] 10,748 [15],[16],[37],[39]   10,897 [18],[19],[38],[40]   $ 10,748 [15],[16],[37],[39]              
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Drawn                          
Principal amount or par value 848 [18],[19],[22],[23] 1,212 [15],[16],[24],[25]   848 [18],[19],[22],[23]   1,212 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       1,177                  
Fair Value, Ending Balance 847 [18],[19],[23] 1,177 [15],[16],[25]   847 [18],[19],[23]   1,177 [15],[16],[25]              
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Undrawn                          
Principal amount or par value 667 [18],[19],[22],[23] 303 [15],[16],[24],[25]   667 [18],[19],[22],[23]   303 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (9)                  
Fair Value, Ending Balance (1) [18],[19],[23] (9) [15],[16],[25]   (1) [18],[19],[23]   (9) [15],[16],[25]              
Investment, Identifier [Axis]: Bluefin Holding, LLC, Second lien                          
Principal amount or par value 18,000 [18],[22],[28] 18,000 [15],[24],[29]   18,000 [18],[22],[28]   18,000 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       17,338                  
Fair Value, Ending Balance 18,000 [18],[28] 17,338 [15],[29]   18,000 [18],[28]   17,338 [15],[29]              
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 1                          
Principal amount or par value 22,500 [18],[22],[41] 22,500 [15],[24],[42]   22,500 [18],[22],[41]   22,500 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       21,798                  
Fair Value, Ending Balance 21,906 [18],[41] 21,798 [15],[42]   21,906 [18],[41]   21,798 [15],[42]              
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 2                          
Principal amount or par value 16,624 [18],[21],[22] 16,624 [15],[24],[30]   16,624 [18],[21],[22]   16,624 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       16,104                  
Fair Value, Ending Balance 16,184 [18],[21] 16,104 [15],[30]   16,184 [18],[21]   16,104 [15],[30]              
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 3                          
Principal amount or par value 6,000 [18],[22],[28] 6,000 [15],[24],[29]   6,000 [18],[22],[28]   6,000 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       5,813                  
Fair Value, Ending Balance 5,841 [18],[28] 5,813 [15],[29]   5,841 [18],[28]   5,813 [15],[29]              
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                          
Principal amount or par value [15],[16],[24],[25]   392       392              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       392                  
Fair Value, Ending Balance [15],[16],[25]   392       392              
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                          
Principal amount or par value 852 [18],[19],[22],[23] 460 [15],[16],[24],[25]   852 [18],[19],[22],[23]   460 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[23] 0 [15],[16],[25]   0 [18],[19],[23]   0 [15],[16],[25]              
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                          
Principal amount or par value 16,573 [18],[21],[22] 16,659 [15],[24],[30]   16,573 [18],[21],[22]   16,659 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       16,659                  
Fair Value, Ending Balance 16,573 [18],[21] 16,659 [15],[30]   16,573 [18],[21]   16,659 [15],[30]              
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                          
Principal amount or par value 3,425 [18],[21],[22] 3,442 [15],[24],[30]   3,425 [18],[21],[22]   3,442 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       3,442                  
Fair Value, Ending Balance 3,425 [18],[21] 3,442 [15],[30]   3,425 [18],[21]   3,442 [15],[30]              
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                          
Principal amount or par value 767 [18],[21],[22] 771 [15],[24],[30]   767 [18],[21],[22]   771 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       771                  
Fair Value, Ending Balance 767 [18],[21] 771 [15],[30]   767 [18],[21]   771 [15],[30]              
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                          
Principal amount or par value 344 [18],[21],[22] 345 [15],[24],[30]   344 [18],[21],[22]   345 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       345                  
Fair Value, Ending Balance 344 [18],[21] 345 [15],[30]   344 [18],[21]   345 [15],[30]              
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                          
Principal amount or par value 274 [18],[21],[22] 275 [15],[24],[30]   274 [18],[21],[22]   275 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       275                  
Fair Value, Ending Balance 274 [18],[21] 275 [15],[30]   274 [18],[21]   275 [15],[30]              
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                          
Principal amount or par value 11,203 [18],[21],[22] 11,392 [15],[24],[30]   11,203 [18],[21],[22]   11,392 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       10,637                  
Fair Value, Ending Balance 10,564 [18],[21] 10,637 [15],[30]   10,564 [18],[21]   10,637 [15],[30]              
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                          
Principal amount or par value 3,337 [18],[21],[22] 3,393 [15],[24],[30]   3,337 [18],[21],[22]   3,393 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       3,168                  
Fair Value, Ending Balance 3,147 [18],[21] 3,168 [15],[30]   3,147 [18],[21]   3,168 [15],[30]              
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                          
Principal amount or par value 8,360 [18],[21],[22] 8,317 [15],[24],[30]   8,360 [18],[21],[22]   8,317 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       7,411                  
Fair Value, Ending Balance 7,699 [18],[21] 7,411 [15],[30]   7,699 [18],[21]   7,411 [15],[30]              
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                          
Principal amount or par value 926 [18],[19],[22],[23] 916 [15],[16],[24],[25]   926 [18],[19],[22],[23]   916 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       817                  
Fair Value, Ending Balance 853 [18],[19],[23] 817 [15],[16],[25]   853 [18],[19],[23]   817 [15],[16],[25]              
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                          
Principal amount or par value 226 [18],[19],[22],[23] 226 [15],[16],[24],[25]   226 [18],[19],[22],[23]   226 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (25)                  
Fair Value, Ending Balance (18) [18],[19],[23] (25) [15],[16],[25]   (18) [18],[19],[23]   (25) [15],[16],[25]              
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 1                          
Principal amount or par value 7,012 [18],[22],[26] 7,012 [15],[24],[27]   7,012 [18],[22],[26]   7,012 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       6,923                  
Fair Value, Ending Balance 7,012 [18],[26] 6,923 [15],[27]   7,012 [18],[26]   6,923 [15],[27]              
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 2                          
Principal amount or par value 4,453 [18],[19],[22] 4,453 [15],[16],[24]   4,453 [18],[19],[22]   4,453 [15],[16],[24]              
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]   4,453 [18],[19]   4,396 [15],[16]              
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 1                          
Principal amount or par value 18,266 [18],[19],[22] 18,266 [15],[16],[24]   18,266 [18],[19],[22]   18,266 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       17,409                  
Fair Value, Ending Balance 17,705 [18],[19] 17,409 [15],[16]   17,705 [18],[19]   17,409 [15],[16]              
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 2                          
Principal amount or par value 7,500 [18],[22],[28] 7,500 [15],[24],[29]   7,500 [18],[22],[28]   7,500 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       7,148                  
Fair Value, Ending Balance 7,270 [18],[28] 7,148 [15],[29]   7,270 [18],[28]   7,148 [15],[29]              
Investment, Identifier [Axis]: Calabrio, Inc., First lien                          
Principal amount or par value 12,347 [18],[22],[41] 12,347 [15],[24],[42]   12,347 [18],[22],[41]   12,347 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       12,347                  
Fair Value, Ending Balance 11,646 [18],[41] 12,347 [15],[42]   11,646 [18],[41]   12,347 [15],[42]              
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                          
Principal amount or par value 850 [18],[19],[22],[23] 850 [15],[16],[24],[25]   850 [18],[19],[22],[23]   850 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       850                  
Fair Value, Ending Balance 801 [18],[19],[23] 850 [15],[16],[25]   801 [18],[19],[23]   850 [15],[16],[25]              
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                          
Principal amount or par value 637 [18],[19],[22],[23] 637 [15],[16],[24],[25]   637 [18],[19],[22],[23]   637 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance (36) [18],[19],[23] 0 [15],[16],[25]   (36) [18],[19],[23]   0 [15],[16],[25]              
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                          
Principal amount or par value 11,913 [22],[26] 11,974 [15],[24],[27]   11,913 [22],[26]   11,974 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       11,490                  
Fair Value, Ending Balance 10,573 [26] 11,490 [15],[27]   10,573 [26]   11,490 [15],[27]              
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                          
Principal amount or par value 9,767 [18],[22],[26] 9,767 [15],[24],[27]   9,767 [18],[22],[26]   9,767 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       9,432                  
Fair Value, Ending Balance 8,938 [18],[26] 9,432 [15],[27]   8,938 [18],[26]   9,432 [15],[27]              
Investment, Identifier [Axis]: Castle Management Borrower LLC, First lien                          
Principal amount or par value 13,845 [18],[22],[28] 14,288 [15],[24],[29]   13,845 [18],[22],[28]   14,288 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       13,605                  
Fair Value, Ending Balance 13,845 [18],[28] 13,605 [15],[29]   13,845 [18],[28]   13,605 [15],[29]              
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 1                          
Principal amount or par value 47,838 [19],[22] 47,838 [16],[24]   47,838 [19],[22]   47,838 [16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [16]       40,941                  
Fair Value, Ending Balance 42,815 [19] 40,941 [16]   42,815 [19]   40,941 [16]              
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 2                          
Principal amount or par value 7,500 [22],[28] 7,500 [24],[29]   7,500 [22],[28]   7,500 [24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [29]       6,419                  
Fair Value, Ending Balance 6,713 [28] 6,419 [29]   6,713 [28]   6,419 [29]              
Investment, Identifier [Axis]: CommerceHub, Inc., First lien                          
Principal amount or par value [19],[22] 3,990     3,990                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [19] 3,561     3,561                  
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien                          
Principal amount or par value 7,127 [18],[21],[22] 7,163 [15],[24],[30]   7,127 [18],[21],[22]   7,163 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       6,928                  
Fair Value, Ending Balance 7,046 [18],[21] 6,928 [15],[30]   7,046 [18],[21]   6,928 [15],[30]              
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                          
Principal amount or par value 425 [18],[19],[22],[23] 425 [15],[16],[24],[25]   425 [18],[19],[22],[23]   425 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (14)                  
Fair Value, Ending Balance (5) [18],[19],[23] (14) [15],[16],[25]   (5) [18],[19],[23]   (14) [15],[16],[25]              
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                          
Principal amount or par value 849 [18],[19],[22],[23] 849 [15],[16],[24],[25]   849 [18],[19],[22],[23]   849 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (28)                  
Fair Value, Ending Balance (10) [18],[19],[23] (28) [15],[16],[25]   (10) [18],[19],[23]   (28) [15],[16],[25]              
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                          
Principal amount or par value 19,119 [18],[22],[26] 19,215 [15],[24],[27]   19,119 [18],[22],[26]   19,215 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       18,639                  
Fair Value, Ending Balance 18,671 [18],[26] 18,639 [15],[27]   18,671 [18],[26]   18,639 [15],[27]              
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                          
Principal amount or par value 3,192 [18],[22],[26] 3,208 [15],[24],[27]   3,192 [18],[22],[26]   3,208 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       3,112                  
Fair Value, Ending Balance 3,118 [18],[26] 3,112 [15],[27]   3,118 [18],[26]   3,112 [15],[27]              
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                          
Principal amount or par value [18],[19],[22],[23] 1,291     1,291                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 0     0                  
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                          
Principal amount or par value [18],[19],[22],[23] 989     989                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 0     0                  
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 1                          
Principal amount or par value [18],[21],[22] 7,230     7,230                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 7,230     7,230                  
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 2                          
Principal amount or par value [18],[22],[28] 7,230     7,230                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[28] 7,230     7,230                  
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Drawn                          
Principal amount or par value [18],[19],[22],[23] 405     405                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 405     405                  
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                          
Principal amount or par value 608 [18],[19],[22],[23] 1,013 [15],[16],[24],[25]   608 [18],[19],[22],[23]   1,013 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[23] 0 [15],[16],[25]   0 [18],[19],[23]   0 [15],[16],[25]              
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 1                          
Principal amount or par value 13,724 [18],[22],[41] 13,795 [15],[24],[42]   13,724 [18],[22],[41]   13,795 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       13,795                  
Fair Value, Ending Balance 13,724 [18],[41] 13,795 [15],[42]   13,724 [18],[41]   13,795 [15],[42]              
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 2                          
Principal amount or par value 2,470 [18],[22],[41] 2,482 [15],[24],[42]   2,470 [18],[22],[41]   2,482 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       2,482                  
Fair Value, Ending Balance 2,470 [18],[41] 2,482 [15],[42]   2,470 [18],[41]   2,482 [15],[42]              
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien                          
Principal amount or par value [18],[21],[22] 3,270     3,270                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 3,246     3,246                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Drawn                          
Principal amount or par value 2,053 [18],[19],[22],[23] 2,836 [15],[16],[24],[25]   2,053 [18],[19],[22],[23]   2,836 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       2,781                  
Fair Value, Ending Balance 2,053 [18],[19],[23] 2,781 [15],[16],[25]   2,053 [18],[19],[23]   2,781 [15],[16],[25]              
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn                          
Principal amount or par value [18],[19],[22],[23] 1,883     1,883                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 0     0                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 1                          
Principal amount or par value [15],[16],[24],[25]   450       450              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (9)                  
Fair Value, Ending Balance [15],[16],[25]   (9)       (9)              
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 2                          
Principal amount or par value [16],[24],[25]   3,936       3,936              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [16],[25]       (59)                  
Fair Value, Ending Balance [16],[25]   (59)       (59)              
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                          
Principal amount or par value [15],[24],[30]   19,660       19,660              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       19,278                  
Fair Value, Ending Balance [15],[30]   19,278       19,278              
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                          
Principal amount or par value [15],[24],[30]   7,046       7,046              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       6,909                  
Fair Value, Ending Balance [15],[30]   6,909       6,909              
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 3                          
Principal amount or par value [15],[16],[24]   3,273       3,273              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       3,209                  
Fair Value, Ending Balance [15],[16]   3,209       3,209              
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                          
Principal amount or par value 20,313 [19],[22] 20,313 [16],[24]   20,313 [19],[22]   20,313 [16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [16]       18,053                  
Fair Value, Ending Balance 18,110 [19] 18,053 [16]   18,110 [19]   18,053 [16]              
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                          
Principal amount or par value [15],[24],[25],[27]   2,457       2,457              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[27]       (67)                  
Fair Value, Ending Balance [15],[25],[27]   (67)       (67)              
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 1                          
Principal amount or par value 2,405 [18],[19],[22],[23] 2,405 [15],[16],[24],[25]   2,405 [18],[19],[22],[23]   2,405 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (66)                  
Fair Value, Ending Balance (68) [18],[19],[23] (66) [15],[16],[25]   (68) [18],[19],[23]   (66) [15],[16],[25]              
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 2                          
Principal amount or par value 2,457 [18],[22],[23],[26] 6,561 [15],[16],[24],[25]   2,457 [18],[22],[23],[26]   6,561 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (180)                  
Fair Value, Ending Balance (70) [18],[23],[26] (180) [15],[16],[25]   (70) [18],[23],[26]   (180) [15],[16],[25]              
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 3                          
Principal amount or par value [18],[19],[22],[23] 6,561     6,561                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] (186)     (186)                  
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                          
Principal amount or par value 18,619 [18],[22],[28] 18,760 [15],[24],[29]   18,619 [18],[22],[28]   18,760 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       18,246                  
Fair Value, Ending Balance 18,090 [18],[28] 18,246 [15],[29]   18,090 [18],[28]   18,246 [15],[29]              
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                          
Principal amount or par value 6,973 [18],[22],[26] 7,025 [15],[24],[27]   6,973 [18],[22],[26]   7,025 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       6,833                  
Fair Value, Ending Balance 6,775 [18],[26] 6,833 [15],[27]   6,775 [18],[26]   6,833 [15],[27]              
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First lien                          
Principal amount or par value 7,509 [18],[21],[22] 7,547 [24],[30]   7,509 [18],[21],[22]   7,547 [24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [30]       7,434                  
Fair Value, Ending Balance 7,509 [18],[21] 7,434 [30]   7,509 [18],[21]   7,434 [30]              
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn                          
Principal amount or par value 115 [18],[19],[22],[23] 33 [15],[16],[24],[25]   115 [18],[19],[22],[23]   33 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       32                  
Fair Value, Ending Balance 113 [18],[19],[23] 32 [15],[16],[25]   113 [18],[19],[23]   32 [15],[16],[25]              
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                          
Principal amount or par value 524 [18],[19],[22],[23] 524 [15],[16],[24],[25]   524 [18],[19],[22],[23]   524 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (15)                  
Fair Value, Ending Balance (8) [18],[19],[23] (15) [15],[16],[25]   (8) [18],[19],[23]   (15) [15],[16],[25]              
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                          
Principal amount or par value 871 [18],[19],[22],[23] 953 [15],[16],[24],[25]   871 [18],[19],[22],[23]   953 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (27)                  
Fair Value, Ending Balance (13) [18],[19],[23] (27) [15],[16],[25]   (13) [18],[19],[23]   (27) [15],[16],[25]              
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                          
Principal amount or par value 13,078 [18],[22],[28] 13,144 [15],[24],[29]   13,078 [18],[22],[28]   13,144 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       12,776                  
Fair Value, Ending Balance 12,878 [18],[28] 12,776 [15],[29]   12,878 [18],[28]   12,776 [15],[29]              
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                          
Principal amount or par value 1,102 [18],[21],[22] 1,107 [15],[24],[30]   1,102 [18],[21],[22]   1,107 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       1,076                  
Fair Value, Ending Balance 1,085 [18],[21] 1,076 [15],[30]   $ 1,085 [18],[21]   $ 1,076 [15],[30]              
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 66,583 [18],[19],[44] 65,688 [15],[16],[43]   66,583 [18],[19],[44]   $ 65,688 [15],[16],[43]              
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien                          
Principal amount or par value [15],[24],[30]   37,860       37,860              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       36,232                  
Fair Value, Ending Balance [15],[30]   36,232       36,232              
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 1                          
Principal amount or par value [15],[16],[24],[25]   3,985       3,985              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       3,814                  
Fair Value, Ending Balance [15],[16],[25]   3,814       3,814              
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 2                          
Principal amount or par value [15],[16],[24],[25]   2,623       2,623              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       2,510                  
Fair Value, Ending Balance [15],[16],[25]   2,510       2,510              
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 1                          
Principal amount or par value 202 [18],[19],[22],[23] 404 [15],[16],[24],[25]   202 [18],[19],[22],[23]   404 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (17)                  
Fair Value, Ending Balance (8) [18],[19],[23] (17) [15],[16],[25]   (8) [18],[19],[23]   (17) [15],[16],[25]              
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 2                          
Principal amount or par value 9,080 [18],[19],[22],[23] 9,080 [15],[16],[24],[25]   9,080 [18],[19],[22],[23]   9,080 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (390)                  
Fair Value, Ending Balance (368) [18],[19],[23] $ (390) [15],[16],[25]   (368) [18],[19],[23]   $ (390) [15],[16],[25]              
Investment, Identifier [Axis]: Deca Dental Holdings LLC., First lien                          
Principal amount or par value [18],[21],[22] 37,669     37,669                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 36,143     36,143                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC., First lien - Drawn 1                          
Principal amount or par value [18],[19],[22],[23] 3,965     3,965                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 3,805     3,805                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC., First lien - Drawn 2                          
Principal amount or par value [18],[19],[22],[23] 2,825     2,825                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] $ 2,711     $ 2,711                  
Investment, Identifier [Axis]: Diamond Parent Holdings Corp, Wholly-owned subsidiaries                          
Number of investments held | investment 2 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 3      
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                          
Principal amount or par value $ 1,739 [18],[19],[22],[23] $ 1,087 [15],[16],[24],[25]   $ 1,739 [18],[19],[22],[23]   $ 1,087 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       1,087                  
Fair Value, Ending Balance 1,685 [18],[19],[23] 1,087 [15],[16],[25]   1,685 [18],[19],[23]   1,087 [15],[16],[25]              
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn                          
Principal amount or par value 1,884 [18],[19],[22],[23] 2,537 [15],[16],[24],[25]   1,884 [18],[19],[22],[23]   2,537 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25],[45]       0                  
Fair Value, Ending Balance (60) [18],[19],[23],[46] 0 [15],[16],[25],[45]   (60) [18],[19],[23],[46]   0 [15],[16],[25],[45]              
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                          
Principal amount or par value 17,494 [18],[21],[22] 17,583 [15],[24],[30]   17,494 [18],[21],[22]   17,583 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       17,371                  
Fair Value, Ending Balance 16,861 [18],[21] 17,371 [15],[30]   16,861 [18],[21]   17,371 [15],[30]              
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                          
Principal amount or par value 9,755 [18],[21],[22] 9,805 [15],[24],[30]   9,755 [18],[21],[22]   9,805 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       9,688                  
Fair Value, Ending Balance 9,402 [18],[21] 9,688 [15],[30]   9,402 [18],[21]   9,688 [15],[30]              
Investment, Identifier [Axis]: Diligent Corporation, First lien 3                          
Principal amount or par value 5,798 [18],[19],[22] 5,827 [15],[16],[24]   5,798 [18],[19],[22]   5,827 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       5,827                  
Fair Value, Ending Balance 5,614 [18],[19] 5,827 [15],[16]   $ 5,614 [18],[19]   $ 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 11,197 [18],[19],[46] 11,304 [15],[16],[45]   11,197 [18],[19],[46]   $ 11,304 [15],[16],[45]              
Investment, Identifier [Axis]: EAB Global, Inc., Second lien                          
Principal amount or par value 33,452 [18],[21],[22] 33,452 [15],[24],[30]   33,452 [18],[21],[22]   33,452 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       32,392                  
Fair Value, Ending Balance 32,703 [18],[21] 32,392 [15],[30]   32,703 [18],[21]   32,392 [15],[30]              
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                          
Principal amount or par value [18],[21],[22] 10,676     10,676                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 10,676     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],[22] 342     342                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19] 342     342                  
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC, Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19] 4,093     4,093                  
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                          
Principal amount or par value 17,584 [18],[19],[22] 16,473 [15],[16],[24]   17,584 [18],[19],[22]   16,473 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       16,473                  
Fair Value, Ending Balance 17,584 [18],[19] 16,473 [15],[16]   17,584 [18],[19]   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 [30]       0                  
Fair Value, Ending Balance 0 [21] 0 [30]   0 [21]   0 [30]              
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 [19]   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 [30]       0                  
Fair Value, Ending Balance 0 [21] 0 [30]   0 [21]   0 [30]              
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 [19]   0 [16]              
Investment, Identifier [Axis]: Education Management II LLC, First lien 1                          
Principal amount or par value 300 [21],[22] 300 [24],[30]   300 [21],[22]   300 [24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [30]       0                  
Fair Value, Ending Balance 0 [21] 0 [30]   0 [21]   0 [30]              
Investment, Identifier [Axis]: Education Management II LLC, First lien 2                          
Principal amount or par value 169 [19],[22] 169 [16],[24]   169 [19],[22]   169 [16],[24]              
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 [19]   0 [16]              
Investment, Identifier [Axis]: Education Management II LLC, First lien 3                          
Principal amount or par value 205 [21],[22] 205 [24],[30]   205 [21],[22]   205 [24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [30]       0                  
Fair Value, Ending Balance 0 [21] 0 [30]   0 [21]   0 [30]              
Investment, Identifier [Axis]: Education Management II LLC, First lien 4                          
Principal amount or par value 115 [19],[22] 115 [16],[24]   115 [19],[22]   115 [16],[24]              
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 [19]   0 [16]              
Investment, Identifier [Axis]: Education Management II LLC, First lien 5                          
Principal amount or par value 139 [21],[22] 139 [24],[30]   139 [21],[22]   139 [24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [30]       0                  
Fair Value, Ending Balance 0 [21] 0 [30]   0 [21]   0 [30]              
Investment, Identifier [Axis]: Education Management II LLC, First lien 6                          
Principal amount or par value 79 [19],[22] 79 [16],[24]   79 [19],[22]   79 [16],[24]              
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 [19]   0 [16]              
Investment, Identifier [Axis]: Education Management II LLC, First lien 7                          
Principal amount or par value 4 [21],[22] 4 [24],[30]   4 [21],[22]   4 [24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [30]       0                  
Fair Value, Ending Balance 0 [21] 0 [30]   0 [21]   0 [30]              
Investment, Identifier [Axis]: Education Management II LLC, First lien 8                          
Principal amount or par value 2 [19],[22] 2 [16],[24]   2 [19],[22]   2 [16],[24]              
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 [19]   0 [16]              
Investment, Identifier [Axis]: Education Management II LLC, First lien, Non-accrual status                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance $ 0     0                  
Investment, Identifier [Axis]: FR Arsenal Holdings II Corp., First lien                          
Principal amount or par value [15],[24],[30]   14,582       14,582              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       $ 13,123                  
Fair Value, Ending Balance [15],[30]   $ 13,123       $ 13,123              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien                          
Number of investments held | investment 3 2   3   2 3 3 2 2      
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn                          
Principal amount or par value [18],[19],[22],[23] $ 3,867     $ 3,867                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 3,828     3,828                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 1                          
Principal amount or par value [15],[16],[24],[25]   $ 490       $ 490              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       477                  
Fair Value, Ending Balance [15],[16],[25]   477       477              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 2                          
Principal amount or par value [15],[16],[24],[25]   589       589              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       584                  
Fair Value, Ending Balance [15],[16],[25]   584       584              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                          
Principal amount or par value 1,400 [18],[19],[22],[23] 910 [15],[16],[24],[25]   1,400 [18],[19],[22],[23]   910 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (25)                  
Fair Value, Ending Balance (29) [18],[19],[23] (25) [15],[16],[25]   (29) [18],[19],[23]   (25) [15],[16],[25]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                          
Principal amount or par value 1,885 [18],[19],[22],[23] 5,165 [15],[16],[24],[25]   1,885 [18],[19],[22],[23]   5,165 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (52)                  
Fair Value, Ending Balance (19) [18],[19],[23] (52) [15],[16],[25]   (19) [18],[19],[23]   (52) [15],[16],[25]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                          
Principal amount or par value 10,343 [18],[22],[41] 10,395 [15],[24],[42]   10,343 [18],[22],[41]   10,395 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       10,110                  
Fair Value, Ending Balance 10,127 [18],[41] 10,110 [15],[42]   10,127 [18],[41]   10,110 [15],[42]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                          
Principal amount or par value 3,471 [18],[22],[41] 3,489 [15],[24],[42]   3,471 [18],[22],[41]   3,489 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       3,393                  
Fair Value, Ending Balance 3,399 [18],[41] 3,393 [15],[42]   3,399 [18],[41]   3,393 [15],[42]              
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                          
Principal amount or par value 3,450 [18],[22],[41] 3,467 [15],[24],[42]   3,450 [18],[22],[41]   3,467 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       3,372                  
Fair Value, Ending Balance 3,377 [18],[41] 3,372 [15],[42]   3,377 [18],[41]   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],[47]       4,686                  
Fair Value, Ending Balance 4,126 [18],[41],[48] 4,686 [15],[42],[47]   4,126 [18],[41],[48]   4,686 [15],[42],[47]              
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Drawn                          
Principal amount or par value [18],[19],[22],[23] 545     545                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 545     545                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                          
Principal amount or par value 4,627 [18],[19],[22],[23] 2,095 [15],[16],[24],[25]   4,627 [18],[19],[22],[23]   2,095 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (21)                  
Fair Value, Ending Balance 0 [18],[19],[23] (21) [15],[16],[25]   0 [18],[19],[23]   (21) [15],[16],[25]              
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                          
Principal amount or par value 1,551 [18],[19],[22],[23] 4,907 [15],[16],[24],[25]   1,551 [18],[19],[22],[23]   4,907 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (49)                  
Fair Value, Ending Balance 0 [18],[19],[23] (49) [15],[16],[25]   0 [18],[19],[23]   (49) [15],[16],[25]              
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                          
Principal amount or par value 33,869 [18],[21],[22] 31,968 [15],[24],[30]   33,869 [18],[21],[22]   31,968 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       31,648                  
Fair Value, Ending Balance 33,869 [18],[21] 31,648 [15],[30]   33,869 [18],[21]   31,648 [15],[30]              
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                          
Principal amount or par value 278 [18],[19],[22] 2,072 [15],[16],[24]   278 [18],[19],[22]   2,072 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       2,051                  
Fair Value, Ending Balance 278 [18],[19] 2,051 [15],[16]   278 [18],[19]   2,051 [15],[16]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn                          
Principal amount or par value [15],[16],[24],[25]   381       381              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       372                  
Fair Value, Ending Balance [15],[16],[25]   372       372              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 1                          
Principal amount or par value [18],[19],[22],[23] 381     381                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 374     374                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 2                          
Principal amount or par value [18],[19],[22],[23] 29     29                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 29     29                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                          
Principal amount or par value 2,479 [18],[19],[22],[23] 81 [15],[16],[24],[25]   2,479 [18],[19],[22],[23]   81 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (2)                  
Fair Value, Ending Balance (40) [18],[19],[23] (2) [15],[16],[25]   (40) [18],[19],[23]   (2) [15],[16],[25]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                          
Principal amount or par value 4,857 [18],[19],[22],[23] 2,479 [15],[16],[24],[25]   4,857 [18],[19],[22],[23]   2,479 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (58)                  
Fair Value, Ending Balance (78) [18],[19],[23] (58) [15],[16],[25]   (78) [18],[19],[23]   (58) [15],[16],[25]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 3                          
Principal amount or par value [15],[16],[24],[25]   4,886       4,886              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (114)                  
Fair Value, Ending Balance [15],[16],[25]   (114)       (114)              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                          
Principal amount or par value 17,441 [18],[21],[22] 17,529 [15],[24],[30]   17,441 [18],[21],[22]   17,529 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       17,119                  
Fair Value, Ending Balance 17,162 [18],[21] 17,119 [15],[30]   17,162 [18],[21]   17,119 [15],[30]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                          
Principal amount or par value 10,144 [18],[22],[28] 10,195 [15],[24],[29]   10,144 [18],[22],[28]   10,195 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       9,957                  
Fair Value, Ending Balance 9,982 [18],[28] 9,957 [15],[29]   9,982 [18],[28]   9,957 [15],[29]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                          
Principal amount or par value 871 [18],[19],[22] 875 [15],[16],[24]   871 [18],[19],[22]   875 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       855                  
Fair Value, Ending Balance 857 [18],[19] 855 [15],[16]   857 [18],[19]   855 [15],[16]              
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 4                          
Principal amount or par value [18],[19],[22] 81     81                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19] 80     80                  
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                          
Principal amount or par value 22,500 [18],[22],[41] 22,500 [15],[24],[42]   22,500 [18],[22],[41]   22,500 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       20,810                  
Fair Value, Ending Balance 20,714 [18],[41] 20,810 [15],[42]   20,714 [18],[41]   20,810 [15],[42]              
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                          
Principal amount or par value 7,009 [18],[21],[22] 7,009 [15],[24],[30]   7,009 [18],[21],[22]   7,009 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       6,483                  
Fair Value, Ending Balance 6,452 [18],[21] 6,483 [15],[30]   6,452 [18],[21]   6,483 [15],[30]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 1                          
Principal amount or par value 16,831 [18],[21],[22],[23] 16,611 [15],[24],[25],[30]   16,831 [18],[21],[22],[23]   16,611 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       16,411                  
Fair Value, Ending Balance 16,831 [18],[21],[23] 16,411 [15],[25],[30]   16,831 [18],[21],[23]   16,411 [15],[25],[30]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 2                          
Principal amount or par value 988 [18],[19],[22],[23] 988 [15],[16],[24],[25]   988 [18],[19],[22],[23]   988 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       976                  
Fair Value, Ending Balance 988 [18],[19],[23] 976 [15],[16],[25]   988 [18],[19],[23]   976 [15],[16],[25]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 1                          
Principal amount or par value 453 [18],[21],[22],[23] 757 [15],[24],[25],[30]   453 [18],[21],[22],[23]   757 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       (9)                  
Fair Value, Ending Balance 0 [18],[21],[23] (9) [15],[25],[30]   0 [18],[21],[23]   (9) [15],[25],[30]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 2                          
Principal amount or par value 2,963 [18],[19],[22],[23] 2,963 [15],[16],[24],[25]   2,963 [18],[19],[22],[23]   2,963 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (36)                  
Fair Value, Ending Balance 0 [18],[19],[23] (36) [15],[16],[25]   0 [18],[19],[23]   (36) [15],[16],[25]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                          
Principal amount or par value 21,774 [18],[22],[41] 21,885 [15],[24],[42]   21,774 [18],[22],[41]   21,885 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       21,623                  
Fair Value, Ending Balance 21,773 [18],[41] 21,623 [15],[42]   21,773 [18],[41]   21,623 [15],[42]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                          
Principal amount or par value 13,144 [18],[21],[22] 13,211 [15],[24],[30]   13,144 [18],[21],[22]   13,211 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       13,052                  
Fair Value, Ending Balance 13,144 [18],[21] 13,052 [15],[30]   13,144 [18],[21]   13,052 [15],[30]              
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 3                          
Principal amount or par value 10,498 [18],[21],[22] 10,551 [15],[24],[30]   10,498 [18],[21],[22]   10,551 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       10,424                  
Fair Value, Ending Balance 10,498 [18],[21] 10,424 [15],[30]   10,498 [18],[21]   10,424 [15],[30]              
Investment, Identifier [Axis]: GEDC Equity, LLC, Participation Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19] 190     190                  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn                          
Principal amount or par value [18],[19],[22] 1,243     1,243                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19] 1,243     1,243                  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                          
Principal amount or par value 2,487 [18],[19],[22],[23] 5,917 [15],[16],[24],[25]   2,487 [18],[19],[22],[23]   5,917 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (53)                  
Fair Value, Ending Balance 0 [18],[19],[23] (53) [15],[16],[25]   0 [18],[19],[23]   (53) [15],[16],[25]              
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                          
Principal amount or par value 34,200 [18],[21],[22] 67,275 [15],[24],[30]   34,200 [18],[21],[22]   67,275 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       66,675                  
Fair Value, Ending Balance 34,199 [18],[21] 66,675 [15],[30]   34,199 [18],[21]   66,675 [15],[30]              
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                          
Principal amount or par value 21,633 [18],[22],[41] 21,745 [15],[24],[42]   21,633 [18],[22],[41]   21,745 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       21,551                  
Fair Value, Ending Balance 21,633 [18],[41] 21,551 [15],[42]   21,633 [18],[41]   21,551 [15],[42]              
Investment, Identifier [Axis]: Granicus, Inc., First lien - Drawn                          
Principal amount or par value 748 [18],[19],[22],[23] 810 [15],[16],[24],[25]   748 [18],[19],[22],[23]   810 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       810                  
Fair Value, Ending Balance 748 [18],[19],[23] 810 [15],[16],[25]   748 [18],[19],[23]   810 [15],[16],[25]              
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn                          
Principal amount or par value 1,666 [18],[19],[22],[23] 1,604 [15],[16],[24],[25]   1,666 [18],[19],[22],[23]   1,604 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[23] 0 [15],[16],[25]   0 [18],[19],[23]   0 [15],[16],[25]              
Investment, Identifier [Axis]: Granicus, Inc., First lien 1                          
Principal amount or par value 15,382 [18],[22],[26] 15,405 [15],[24],[27]   15,382 [18],[22],[26]   15,405 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       15,405                  
Fair Value, Ending Balance 15,382 [18],[26] 15,405 [15],[27]   15,382 [18],[26]   15,405 [15],[27]              
Investment, Identifier [Axis]: Granicus, Inc., First lien 2                          
Principal amount or par value 5,950 [18],[22],[28] 5,959 [15],[24],[29]   5,950 [18],[22],[28]   5,959 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       5,959                  
Fair Value, Ending Balance 5,950 [18],[28] 5,959 [15],[29]   5,950 [18],[28]   5,959 [15],[29]              
Investment, Identifier [Axis]: Granicus, Inc., First lien 3                          
Principal amount or par value 5,869 [18],[21],[22] 5,877 [15],[24],[30]   5,869 [18],[21],[22]   5,877 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       5,877                  
Fair Value, Ending Balance 5,869 [18],[21] 5,877 [15],[30]   5,869 [18],[21]   5,877 [15],[30]              
Investment, Identifier [Axis]: Granicus, Inc., First lien 4                          
Principal amount or par value 4,554 [18],[21],[22] 4,579 [15],[24],[30]   4,554 [18],[21],[22]   4,579 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       4,579                  
Fair Value, Ending Balance 4,554 [18],[21] 4,579 [15],[30]   4,554 [18],[21]   $ 4,579 [15],[30]              
Investment, Identifier [Axis]: Groundworks, LLC, First lien                          
Principal amount or par value [18],[22],[26] 17,338     17,338                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[26] 17,078     17,078                  
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 1                          
Principal amount or par value [18],[19],[22],[23] 1,076     1,076                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] (16)     (16)                  
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 2                          
Principal amount or par value [18],[22],[23],[26] 3,164     3,164                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[23],[26] (47)     $ (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],[49],[50]       $ 5,126                  
Fair Value, Ending Balance 5,128 [18],[51],[52] 5,126 [15],[49],[50]   5,128 [18],[51],[52]   $ 5,126 [15],[49],[50]              
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                          
Principal amount or par value [18],[22],[41] 22,500     22,500                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[41] 20,853     20,853                  
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                          
Principal amount or par value [18],[21],[22] 4,208     4,208                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 3,900     3,900                  
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                          
Principal amount or par value [15],[24],[42]   22,500       22,500              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       21,409                  
Fair Value, Ending Balance [15],[42]   21,409       21,409              
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                          
Principal amount or par value [15],[24],[30]   4,208       4,208              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       4,004                  
Fair Value, Ending Balance [15],[30]   4,004       4,004              
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],[53]       35,679                  
Fair Value, Ending Balance 6,602 [18],[54] 35,679 [15],[53]   6,602 [18],[54]   35,679 [15],[53]              
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],[55]       109                  
Fair Value, Ending Balance 92 [18],[56] 109 [15],[55]   92 [18],[56]   109 [15],[55]              
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                          
Principal amount or par value 8,000 [18],[19],[22],[23] 8,000 [15],[16],[24],[25]   8,000 [18],[19],[22],[23]   8,000 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25],[57]       0                  
Fair Value, Ending Balance 0 [18],[19],[23],[58] 0 [15],[16],[25],[57]   0 [18],[19],[23],[58]   0 [15],[16],[25],[57]              
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Drawn                          
Principal amount or par value [15],[16],[24],[25]   919       919              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       906                  
Fair Value, Ending Balance [15],[16],[25]   906       906              
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                          
Principal amount or par value 2,298 [18],[19],[22],[23] 1,379 [15],[16],[24],[25]   2,298 [18],[19],[22],[23]   1,379 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (19)                  
Fair Value, Ending Balance (23) [18],[19],[23] (19) [15],[16],[25]   (23) [18],[19],[23]   (19) [15],[16],[25]              
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                          
Principal amount or par value 28,986 [18],[21],[22] 29,134 [15],[24],[30]   28,986 [18],[21],[22]   29,134 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       28,731                  
Fair Value, Ending Balance 28,696 [18],[21] 28,731 [15],[30]   28,696 [18],[21]   28,731 [15],[30]              
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                          
Principal amount or par value 4,235 [18],[21],[22] 4,257 [15],[24],[30]   4,235 [18],[21],[22]   4,257 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       4,198                  
Fair Value, Ending Balance 4,193 [18],[21] 4,198 [15],[30]   4,193 [18],[21]   4,198 [15],[30]              
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien                          
Principal amount or par value 12,909 [18],[21],[22] 12,974 [15],[24],[30]   12,909 [18],[21],[22]   12,974 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       12,845                  
Fair Value, Ending Balance 12,676 [18],[21] 12,845 [15],[30]   12,676 [18],[21]   12,845 [15],[30]              
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn                          
Principal amount or par value 834 [18],[19],[22],[23] 294 [15],[16],[24],[25]   834 [18],[19],[22],[23]   294 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       291                  
Fair Value, Ending Balance 819 [18],[19],[23] 291 [15],[16],[25]   819 [18],[19],[23]   291 [15],[16],[25]              
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                          
Principal amount or par value 1,548 [18],[19],[22],[23] 1,254 [15],[16],[24],[25]   1,548 [18],[19],[22],[23]   1,254 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (13)                  
Fair Value, Ending Balance (28) [18],[19],[23] (13) [15],[16],[25]   (28) [18],[19],[23]   (13) [15],[16],[25]              
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                          
Principal amount or par value 2,261 [18],[19],[22],[23] 3,097 [15],[16],[24],[25]   2,261 [18],[19],[22],[23]   3,097 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (31)                  
Fair Value, Ending Balance (41) [18],[19],[23] (31) [15],[16],[25]   (41) [18],[19],[23]   (31) [15],[16],[25]              
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                          
Principal amount or par value 22,500 [18],[22],[26] 22,500 [15],[24],[27]   22,500 [18],[22],[26]   22,500 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       21,168                  
Fair Value, Ending Balance 21,767 [18],[26] 21,168 [15],[27]   21,767 [18],[26]   21,168 [15],[27]              
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                          
Principal amount or par value 3,000 [18],[19],[22] 3,000 [15],[16],[24]   3,000 [18],[19],[22]   3,000 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       2,822                  
Fair Value, Ending Balance 2,902 [18],[19] 2,822 [15],[16]   2,902 [18],[19]   2,822 [15],[16]              
Investment, Identifier [Axis]: Infogain Corporation, First lien - Drawn                          
Principal amount or par value [15],[16],[24],[25]   1,068       1,068              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       1,048                  
Fair Value, Ending Balance [15],[16],[25]   1,048       1,048              
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                          
Principal amount or par value 3,827 [18],[19],[22],[23] 2,759 [15],[16],[24],[25]   3,827 [18],[19],[22],[23]   2,759 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (52)                  
Fair Value, Ending Balance 0 [18],[19],[23] (52) [15],[16],[25]   0 [18],[19],[23]   (52) [15],[16],[25]              
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                          
Principal amount or par value 18,803 [18],[21],[22] 18,898 [15],[24],[30]   18,803 [18],[21],[22]   18,898 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       18,545                  
Fair Value, Ending Balance 18,803 [18],[21] 18,545 [15],[30]   18,803 [18],[21]   18,545 [15],[30]              
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                          
Principal amount or par value 7,884 [18],[22],[28] 7,923 [15],[24],[29]   7,884 [18],[22],[28]   7,923 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       7,775                  
Fair Value, Ending Balance 7,884 [18],[28] 7,775 [15],[29]   7,884 [18],[28]   7,775 [15],[29]              
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                          
Principal amount or par value 17,245 [18],[19],[22] 17,245 [15],[16],[24]   17,245 [18],[19],[22]   17,245 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       16,846                  
Fair Value, Ending Balance 17,029 [18],[19] 16,846 [15],[16]   17,029 [18],[19]   16,846 [15],[16]              
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                          
Principal amount or par value 3,954 [18],[21],[22] 4,187 [15],[24],[30]   3,954 [18],[21],[22]   4,187 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       4,187                  
Fair Value, Ending Balance 3,954 [18],[21] 4,187 [15],[30]   3,954 [18],[21]   4,187 [15],[30]              
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                          
Principal amount or par value 781 [18],[19],[22] 827 [15],[16],[24]   781 [18],[19],[22]   827 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       828                  
Fair Value, Ending Balance 781 [18],[19] 828 [15],[16]   781 [18],[19]   828 [15],[16]              
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                          
Principal amount or par value 12,520 [18],[19],[22] 11,510 [15],[16],[24]   12,520 [18],[19],[22]   11,510 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       8,718                  
Fair Value, Ending Balance 11,326 [18],[19] 8,718 [15],[16]   11,326 [18],[19]   8,718 [15],[16]              
Investment, Identifier [Axis]: Integro Parent Inc., Second lien, Non-accrual status                          
Principal amount or par value     $ 4,382   $ 4,382                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance 3,964     3,964                  
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 1                          
Principal amount or par value 18,750 [18],[21],[22] 18,750 [15],[24],[30]   18,750 [18],[21],[22]   18,750 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       15,938                  
Fair Value, Ending Balance 16,533 [18],[21] 15,938 [15],[30]   16,533 [18],[21]   15,938 [15],[30]              
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 2                          
Principal amount or par value 18,750 [18],[22],[28] 18,750 [15],[24],[29]   18,750 [18],[22],[28]   18,750 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       15,937                  
Fair Value, Ending Balance 16,533 [18],[28] 15,937 [15],[29]   16,533 [18],[28]   15,937 [15],[29]              
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                          
Principal amount or par value 640 [18],[21],[22],[23] 145 [15],[24],[25],[30]   640 [18],[21],[22],[23]   145 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       139                  
Fair Value, Ending Balance 631 [18],[21],[23] 139 [15],[25],[30]   631 [18],[21],[23]   139 [15],[25],[30]              
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                          
Principal amount or par value 526 [18],[21],[22],[23] 1,022 [15],[24],[25],[30]   526 [18],[21],[22],[23]   1,022 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       (45)                  
Fair Value, Ending Balance (7) [18],[21],[23] (45) [15],[25],[30]   (7) [18],[21],[23]   (45) [15],[25],[30]              
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                          
Principal amount or par value 6,933 [18],[22],[28] 6,968 [15],[24],[29]   6,933 [18],[22],[28]   6,968 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       6,662                  
Fair Value, Ending Balance 6,844 [18],[28] 6,662 [15],[29]   6,844 [18],[28]   6,662 [15],[29]              
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                          
Principal amount or par value 794 [18],[21],[22] 801 [15],[24],[30]   794 [18],[21],[22]   801 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       766                  
Fair Value, Ending Balance 784 [18],[21] 766 [15],[30]   784 [18],[21]   766 [15],[30]              
Investment, Identifier [Axis]: Kaseya Inc., First lien                          
Principal amount or par value 63,093 [18],[21],[22] 63,093 [15],[24],[30]   63,093 [18],[21],[22]   63,093 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30],[59]       62,172                  
Fair Value, Ending Balance 63,093 [18],[21] 62,172 [15],[30],[59]   63,093 [18],[21]   62,172 [15],[30],[59]              
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 1                          
Principal amount or par value [18],[19],[22],[23] 963     963                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 963     963                  
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 2                          
Principal amount or par value [18],[19],[22],[23] 235     235                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 235     235                  
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                          
Principal amount or par value 3,616 [18],[19],[22],[23] 3,851 [15],[16],[24],[25]   3,616 [18],[19],[22],[23]   3,851 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (56)                  
Fair Value, Ending Balance 0 [18],[19],[23] (56) [15],[16],[25]   0 [18],[19],[23]   (56) [15],[16],[25]              
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                          
Principal amount or par value 2,888 [18],[19],[22],[23] 3,851 [15],[16],[24],[25]   2,888 [18],[19],[22],[23]   3,851 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (56)                  
Fair Value, Ending Balance 0 [18],[19],[23] (56) [15],[16],[25]   0 [18],[19],[23]   (56) [15],[16],[25]              
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien                          
Principal amount or par value 15,707 [18],[22],[41] 15,788 [15],[24],[42]   15,707 [18],[22],[41]   15,788 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       15,788                  
Fair Value, Ending Balance 15,707 [18],[41] 15,788 [15],[42]   15,707 [18],[41]   15,788 [15],[42]              
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                          
Principal amount or par value 1,799 [18],[19],[22],[23] 1,799 [15],[16],[24],[25]   1,799 [18],[19],[22],[23]   1,799 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[23] 0 [15],[16],[25]   0 [18],[19],[23]   0 [15],[16],[25]              
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],[59]       14,661                  
Fair Value, Ending Balance 17,019 [18],[19],[60] 14,661 [15],[16],[59]   $ 17,019 [18],[19],[60]   $ 14,661 [15],[16],[59]              
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 [18],[22],[28] 20,857 [24],[29]   $ 20,857 [18],[22],[28]   $ 20,857 [24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [29]       15,726                  
Fair Value, Ending Balance 17,929 [18],[28] 15,726 [29]   17,929 [18],[28]   15,726 [29]              
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                          
Principal amount or par value [15],[16],[24],[25]   2,002       2,002              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (45)                  
Fair Value, Ending Balance [15],[16],[25]   (45)       (45)              
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                          
Principal amount or par value [18],[19],[22],[23] 2,002     2,002                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] (48)     (48)                  
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 2                          
Principal amount or par value 1,615 [18],[19],[22],[23] 4,074 [15],[16],[24],[25]   1,615 [18],[19],[22],[23]   4,074 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (92)                  
Fair Value, Ending Balance (39) [18],[19],[23] (92) [15],[16],[25]   (39) [18],[19],[23]   (92) [15],[16],[25]              
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                          
Principal amount or par value 21,767 [18],[22],[41] 21,879 [15],[24],[42]   21,767 [18],[22],[41]   21,879 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       21,383                  
Fair Value, Ending Balance 21,245 [18],[41] 21,383 [15],[42]   21,245 [18],[41]   21,383 [15],[42]              
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                          
Principal amount or par value 6,095 [18],[19],[22] 4,615 [15],[24],[30]   6,095 [18],[19],[22]   4,615 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       4,511                  
Fair Value, Ending Balance 5,948 [18],[19] 4,511 [15],[30]   5,948 [18],[19]   4,511 [15],[30]              
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                          
Principal amount or par value 4,592 [18],[21],[22] 3,173 [15],[24],[30]   4,592 [18],[21],[22]   3,173 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       3,101                  
Fair Value, Ending Balance 4,482 [18],[21] 3,101 [15],[30]   4,482 [18],[21]   3,101 [15],[30]              
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                          
Principal amount or par value 3,156 [18],[21],[22] 3,664 [15],[16],[24]   3,156 [18],[21],[22]   3,664 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       3,581                  
Fair Value, Ending Balance 3,080 [18],[21] 3,581 [15],[16]   3,080 [18],[21]   3,581 [15],[16]              
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                          
Principal amount or par value 806 [18],[19],[22] 810 [15],[16],[24]   806 [18],[19],[22]   810 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       791                  
Fair Value, Ending Balance 786 [18],[19] 791 [15],[16]   786 [18],[19]   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],[61]       0                  
Fair Value, Ending Balance 0 [18],[19] 0 [15],[16],[61]   0 [18],[19]   0 [15],[16],[61]              
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[61]       0                  
Fair Value, Ending Balance 0 [18],[19],[62] 0 [15],[16],[61]   0 [18],[19],[62]   0 [15],[16],[61]              
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],[63]       0                  
Fair Value, Ending Balance 7 [18],[38],[64] 0 [15],[37],[63]   7 [18],[38],[64]   0 [15],[37],[63]              
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],[63]       0                  
Fair Value, Ending Balance [15],[63]   0       0              
Investment, Identifier [Axis]: NM CLFX LP, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[63]       16,172                  
Fair Value, Ending Balance 14,065 [18],[64] 16,172 [15],[63]   14,065 [18],[64]   16,172 [15],[63]              
Investment, Identifier [Axis]: NM DRVT LLC, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[63]       0                  
Fair Value, Ending Balance [15],[63]   0       0              
Investment, Identifier [Axis]: NM GLCR LP, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[63]       0                  
Fair Value, Ending Balance [15],[63]   0       0              
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],[63]       1,028                  
Fair Value, Ending Balance 1,041 [18],[38],[64] 1,028 [15],[37],[63]   1,041 [18],[38],[64]   1,028 [15],[37],[63]              
Investment, Identifier [Axis]: NM JRA LLC, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[63]       0                  
Fair Value, Ending Balance [15],[63]   0       0              
Investment, Identifier [Axis]: NM KRLN LLC, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[63]       0                  
Fair Value, Ending Balance [15],[63]   0       0              
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],[63]       94,305                  
Fair Value, Ending Balance 95,772 [18],[38],[64] 94,305 [15],[37],[63]   95,772 [18],[38],[64]   94,305 [15],[37],[63]              
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[63]       9,481                  
Fair Value, Ending Balance 9,464 [18],[64] 9,481 [15],[63]   9,464 [18],[64]   9,481 [15],[63]              
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Drawn                          
Principal amount or par value 1,635 [18],[19],[22],[23] 1,635 [15],[16],[24],[25]   1,635 [18],[19],[22],[23]   1,635 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       1,624                  
Fair Value, Ending Balance 1,607 [18],[19],[23] 1,624 [15],[16],[25]   1,607 [18],[19],[23]   1,624 [15],[16],[25]              
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Undrawn                          
Principal amount or par value 4,266 [18],[19],[22],[23] 9,029 [15],[16],[24],[25]   4,266 [18],[19],[22],[23]   9,029 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (63)                  
Fair Value, Ending Balance (75) [18],[19],[23] (63) [15],[16],[25]   (75) [18],[19],[23]   (63) [15],[16],[25]              
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                          
Principal amount or par value 19,259 [18],[22],[28] 19,259 [15],[24],[29]   19,259 [18],[22],[28]   19,259 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       19,124                  
Fair Value, Ending Balance 18,922 [18],[28] 19,124 [15],[29]   18,922 [18],[28]   19,124 [15],[29]              
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                          
Principal amount or par value 4,913 [18],[21],[22] 4,913 [15],[24],[30]   4,913 [18],[21],[22]   4,913 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       4,879                  
Fair Value, Ending Balance 4,827 [18],[21] 4,879 [15],[30]   4,827 [18],[21]   4,879 [15],[30]              
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[37]       140,000                  
Fair Value, Ending Balance 140,000 [18],[19],[38] 140,000 [15],[16],[37]   140,000 [18],[19],[38]   140,000 [15],[16],[37]              
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[37]       112,400                  
Fair Value, Ending Balance 112,400 [18],[19],[38] 112,400 [15],[16],[37]   112,400 [18],[19],[38]   112,400 [15],[16],[37]              
Investment, Identifier [Axis]: National HME, Inc., Second lien                          
Principal amount or par value [18],[19],[22] 8,281     8,281                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19] 5,000     5,000                  
Other Income   (1,500)                      
Investment, Identifier [Axis]: National HME, Inc., Second lien 1                          
Principal amount or par value [15],[16],[24]   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],[24]   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 38,754 [18],[21],[22] 35,541 [15],[24],[30]   38,754 [18],[21],[22]   35,541 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       35,541                  
Fair Value, Ending Balance 38,754 [18],[21] 35,541 [15],[30]   38,754 [18],[21]   35,541 [15],[30]              
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                          
Principal amount or par value 9,508 [18],[22],[28] 8,720 [15],[24],[29]   9,508 [18],[22],[28]   8,720 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       8,720                  
Fair Value, Ending Balance 9,508 [18],[28] 8,720 [15],[29]   9,508 [18],[28]   8,720 [15],[29]              
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                          
Principal amount or par value 11,943 [18],[19],[22] 4,282 [15],[16],[24]   11,943 [18],[19],[22]   4,282 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       4,282                  
Fair Value, Ending Balance 11,943 [18],[19] 4,282 [15],[16]   11,943 [18],[19]   4,282 [15],[16]              
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                          
Principal amount or par value 19,843 [18],[19],[22] 18,687 [15],[16],[24]   19,843 [18],[19],[22]   18,687 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       14,950                  
Fair Value, Ending Balance 15,876 [18],[19] 14,950 [15],[16]   15,876 [18],[19]   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],[30]       34,490                  
Fair Value, Ending Balance 34,490 [18],[21] 34,490 [15],[30]   34,490 [18],[21]   34,490 [15],[30]              
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       8,462                  
Fair Value, Ending Balance 8,462 [18],[28] 8,462 [15],[29]   8,462 [18],[28]   8,462 [15],[29]              
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 7,700 [18],[19] 7,701 [15],[16]   7,700 [18],[19]   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 26,000 [18],[19] 26,000 [15],[16]   26,000 [18],[19]   26,000 [15],[16]              
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                          
Principal amount or par value 23,336 [18],[19],[22] 21,779 [15],[16],[24]   23,336 [18],[19],[22]   21,779 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       21,779                  
Fair Value, Ending Balance 23,336 [18],[19] 21,779 [15],[16]   23,336 [18],[19]   21,779 [15],[16]              
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                          
Principal amount or par value 11,411 [18],[19],[22],[23] 9,785 [15],[16],[24],[25]   11,411 [18],[19],[22],[23]   9,785 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       9,785                  
Fair Value, Ending Balance 11,411 [18],[19],[23] 9,785 [15],[16],[25]   11,411 [18],[19],[23]   9,785 [15],[16],[25]              
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                          
Principal amount or par value 10,483 [18],[19],[22],[23] 1,577 [15],[16],[24],[25]   10,483 [18],[19],[22],[23]   1,577 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       0                  
Fair Value, Ending Balance 0 [18],[19],[23] 0 [15],[16],[25]   0 [18],[19],[23]   0 [15],[16],[25]              
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien                          
Principal amount or par value 26,762 [18],[21],[22] 26,762 [15],[24],[30]   26,762 [18],[21],[22]   26,762 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       20,101                  
Fair Value, Ending Balance 15,067 [18],[21] 20,101 [15],[30]   15,067 [18],[21]   20,101 [15],[30]              
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 1                          
Principal amount or par value 871 [18],[19],[22],[23] 876 [15],[16],[24],[25]   871 [18],[19],[22],[23]   876 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       861                  
Fair Value, Ending Balance 811 [18],[19],[23] 861 [15],[16],[25]   811 [18],[19],[23]   861 [15],[16],[25]              
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 2                          
Principal amount or par value 59 [18],[19],[22],[23] 147 [15],[16],[24],[25]   59 [18],[19],[22],[23]   147 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       145                  
Fair Value, Ending Balance 55 [18],[19],[23] 145 [15],[16],[25]   55 [18],[19],[23]   145 [15],[16],[25]              
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 1                          
Principal amount or par value 587 [18],[19],[22],[23] 587 [15],[16],[24],[25]   587 [18],[19],[22],[23]   587 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (10)                  
Fair Value, Ending Balance (41) [18],[19],[23] (10) [15],[16],[25]   (41) [18],[19],[23]   (10) [15],[16],[25]              
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 2                          
Principal amount or par value 822 [18],[19],[22],[23] 734 [15],[16],[24],[25]   822 [18],[19],[22],[23]   734 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (12)                  
Fair Value, Ending Balance (57) [18],[19],[23] (12) [15],[16],[25]   (57) [18],[19],[23]   (12) [15],[16],[25]              
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                          
Principal amount or par value 10,000 [18],[22],[28] 10,051 [15],[24],[29]   10,000 [18],[22],[28]   10,051 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       9,882                  
Fair Value, Ending Balance 9,305 [18],[28] 9,882 [15],[29]   9,305 [18],[28]   9,882 [15],[29]              
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                          
Principal amount or par value 9,875 [18],[22],[28] 9,925 [15],[24],[29]   9,875 [18],[22],[28]   9,925 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       9,758                  
Fair Value, Ending Balance $ 9,189 [18],[28] 9,758 [15],[29]   $ 9,189 [18],[28]   9,758 [15],[29]              
Investment, Identifier [Axis]: OA Buyer, Inc., First lien                          
Number of investments held | investment 2     2     2 2          
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                          
Principal amount or par value $ 3,600 [18],[19],[22],[23] 3,600 [15],[16],[24],[25]   $ 3,600 [18],[19],[22],[23]   3,600 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25],[65]       (29)                  
Fair Value, Ending Balance 0 [18],[19],[23],[66] (29) [15],[16],[25],[65]   0 [18],[19],[23],[66]   (29) [15],[16],[25],[65]              
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                          
Principal amount or par value 27,848 [18],[21],[22] 27,989 [15],[24],[30]   27,848 [18],[21],[22]   27,989 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       27,763                  
Fair Value, Ending Balance 27,849 [18],[21] 27,763 [15],[30]   27,849 [18],[21]   27,763 [15],[30]              
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                          
Principal amount or par value 1,763 [18],[21],[22] 1,772 [15],[24],[30]   1,763 [18],[21],[22]   1,772 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       1,757                  
Fair Value, Ending Balance 1,763 [18],[21] 1,757 [15],[30]   1,763 [18],[21]   1,757 [15],[30]              
Investment, Identifier [Axis]: OA Topco, L.P. , Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[66] 2,307     2,307                  
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],[65]       $ 2,000                  
Fair Value, Ending Balance [15],[16],[65]   2,000       $ 2,000              
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],[67],[68]       $ 7,214                  
Fair Value, Ending Balance $ 7,919 [18],[69],[70] $ 7,214 [15],[67],[68]   $ 7,919 [18],[69],[70]   $ 7,214 [15],[67],[68]              
Investment, Identifier [Axis]: OEConnection LLC, Second lien                          
Number of investments held | investment 2 2   2   2 2 2 2 2      
Investment, Identifier [Axis]: OEConnection LLC, Second lien 1                          
Principal amount or par value $ 23,406 [18],[21],[22] $ 23,406 [15],[24],[30]   $ 23,406 [18],[21],[22]   $ 23,406 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       22,687                  
Fair Value, Ending Balance 23,406 [18],[21] 22,687 [15],[30]   23,406 [18],[21]   22,687 [15],[30]              
Investment, Identifier [Axis]: OEConnection LLC, Second lien 2                          
Principal amount or par value 12,044 [18],[21],[22] 12,044 [15],[24],[30]   12,044 [18],[21],[22]   12,044 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       11,674                  
Fair Value, Ending Balance 12,044 [18],[21] 11,674 [15],[30]   12,044 [18],[21]   11,674 [15],[30]              
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                          
Principal amount or par value [18],[19],[22],[23] 1,860     1,860                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 0     0                  
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 1                          
Principal amount or par value [18],[22],[28] 7,440     7,440                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[28] 7,440     7,440                  
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 2                          
Principal amount or par value [18],[21],[22] 7,440     7,440                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 7,440     7,440                  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien                          
Principal amount or par value 7,514 [18],[22],[26] 6,629 [15],[24],[27]   7,514 [18],[22],[26]   6,629 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       6,500                  
Fair Value, Ending Balance 7,439 [18],[26] 6,500 [15],[27]   7,439 [18],[26]   6,500 [15],[27]              
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Drawn                          
Principal amount or par value [15],[16],[24],[25]   131       131              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       129                  
Fair Value, Ending Balance [15],[16],[25]   129       129              
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                          
Principal amount or par value [18],[19],[22],[23] 486     486                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] (5)     (5)                  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 1                          
Principal amount or par value [15],[16],[24],[25]   355       355              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (7)                  
Fair Value, Ending Balance [15],[16],[25]   (7)       (7)              
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 2                          
Principal amount or par value [15],[24],[25],[27]   885       885              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[27]       (17)                  
Fair Value, Ending Balance [15],[25],[27]   (17)       (17)              
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                          
Principal amount or par value 14,500 [18],[19],[22] 14,500 [15],[16],[24]   14,500 [18],[19],[22]   14,500 [15],[16],[24]             $ 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 7,976 [18],[19] 7,995 [15],[16]   7,976 [18],[19]   7,995 [15],[16]              
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                          
Principal amount or par value 0 [22],[71],[72] 0 [24],[73],[74]   0 [22],[71],[72]   0 [24],[73],[74]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [73],[74]       0                  
Fair Value, Ending Balance 0 [71],[72] 0 [73],[74]   0 [71],[72]   0 [73],[74]              
Investment, Identifier [Axis]: Permian Trust, First lien 1                          
Principal amount or par value 247 [18],[22],[75] 247 [15],[24],[76]   247 [18],[22],[75]   247 [15],[24],[76]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[76]       0                  
Fair Value, Ending Balance 0 [18],[75] 0 [15],[76]   0 [18],[75]   0 [15],[76]              
Investment, Identifier [Axis]: Permian Trust, First lien 2                          
Principal amount or par value 3,409 [18],[19],[22] 3,409 [15],[16],[24]   3,409 [18],[19],[22]   3,409 [15],[16],[24]              
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 [18],[19]   0 [15],[16]              
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 1                          
Principal amount or par value 49,051 [18],[21],[22] 49,270 [15],[24],[30]   49,051 [18],[21],[22]   49,270 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       49,270                  
Fair Value, Ending Balance 49,051 [18],[21] 49,270 [15],[30]   49,051 [18],[21]   49,270 [15],[30]              
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 2                          
Principal amount or par value 18,584 [18],[21],[22] 18,726 [15],[24],[30]   18,584 [18],[21],[22]   18,726 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       18,726                  
Fair Value, Ending Balance $ 18,585 [18],[21] 18,726 [15],[30]   $ 18,585 [18],[21]   18,726 [15],[30]              
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien                          
Number of investments held | investment 2     2     2 2          
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                          
Principal amount or par value $ 2,446 [18],[19],[22],[23] 2,446 [15],[16],[24],[25]   $ 2,446 [18],[19],[22],[23]   2,446 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25],[77]       (32)                  
Fair Value, Ending Balance 0 [18],[19],[23],[78] (32) [15],[16],[25],[77]   0 [18],[19],[23],[78]   (32) [15],[16],[25],[77]              
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                          
Principal amount or par value 15,803 [18],[22],[28] 14,900 [15],[24],[29]   15,803 [18],[22],[28]   14,900 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       14,706                  
Fair Value, Ending Balance 15,803 [18],[28] 14,706 [15],[29]   15,803 [18],[28]   14,706 [15],[29]              
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                          
Principal amount or par value 2,166 [18],[22],[28] 2,042 [15],[24],[29]   2,166 [18],[22],[28]   2,042 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       2,016                  
Fair Value, Ending Balance 2,166 [18],[28] 2,016 [15],[29]   2,166 [18],[28]   2,016 [15],[29]              
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],[77],[79]       1,631                  
Fair Value, Ending Balance 1,658 [18],[78],[80] 1,631 [15],[77],[79]   $ 1,658 [18],[78],[80]   $ 1,631 [15],[77],[79]              
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],[81]       $ 11,569                  
Fair Value, Ending Balance 11,942 [18],[19],[82] 11,569 [15],[16],[81]   11,942 [18],[19],[82]   $ 11,569 [15],[16],[81]              
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien                          
Principal amount or par value [18],[21],[22] 3,571     3,571                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 3,571     3,571                  
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien - Undrawn                          
Principal amount or par value [18],[19],[22],[23] 184     184                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 0     0                  
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien                          
Principal amount or par value 5,135 [18],[21],[22] 5,161 [15],[24],[30]   5,135 [18],[21],[22]   5,161 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       5,014                  
Fair Value, Ending Balance 5,119 [18],[21] 5,014 [15],[30]   5,119 [18],[21]   5,014 [15],[30]              
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Drawn                          
Principal amount or par value [15],[16],[24],[25]   422       422              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       410                  
Fair Value, Ending Balance [15],[16],[25]   410       410              
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                          
Principal amount or par value 1,161 [18],[19],[22],[23] 483 [15],[16],[24],[25]   1,161 [18],[19],[22],[23]   483 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (14)                  
Fair Value, Ending Balance (4) [18],[19],[23] (14) [15],[16],[25]   (4) [18],[19],[23]   (14) [15],[16],[25]              
Investment, Identifier [Axis]: Quartz Holding Company, Second lien                          
Principal amount or par value 10,000 [18],[19],[22] 10,000 [15],[16],[24]   10,000 [18],[19],[22]   10,000 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       9,802                  
Fair Value, Ending Balance 10,000 [18],[19] 9,802 [15],[16]   10,000 [18],[19]   9,802 [15],[16]              
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                          
Principal amount or par value 2,981 [18],[19],[22],[23] 2,981 [15],[16],[24],[25]   2,981 [18],[19],[22],[23]   2,981 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (25)                  
Fair Value, Ending Balance (30) [18],[19],[23] (25) [15],[16],[25]   (30) [18],[19],[23]   (25) [15],[16],[25]              
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 1                          
Principal amount or par value 24,344 [18],[22],[28] 24,469 [15],[24],[29]   24,344 [18],[22],[28]   24,469 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       24,263                  
Fair Value, Ending Balance 24,101 [18],[28] 24,263 [15],[29]   24,101 [18],[28]   24,263 [15],[29]              
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 2                          
Principal amount or par value 12,588 [18],[21],[22] 12,652 [15],[24],[30]   12,588 [18],[21],[22]   12,652 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       12,546                  
Fair Value, Ending Balance 12,462 [18],[21] 12,546 [15],[30]   12,462 [18],[21]   12,546 [15],[30]              
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien                          
Principal amount or par value 6,940 [18],[21],[22] 6,975 [15],[24],[30]   6,940 [18],[21],[22]   6,975 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       6,861                  
Fair Value, Ending Balance 6,940 [18],[21] 6,861 [15],[30]   6,940 [18],[21]   6,861 [15],[30]              
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                          
Principal amount or par value [18],[19],[22],[23] 256     256                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 256     256                  
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                          
Principal amount or par value 256 [18],[19],[22],[23] 512 [15],[16],[24],[25]   256 [18],[19],[22],[23]   512 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (8)                  
Fair Value, Ending Balance 0 [18],[19],[23] (8) [15],[16],[25]   0 [18],[19],[23]   (8) [15],[16],[25]              
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien                          
Principal amount or par value [19],[22] 7,210     7,210                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [19] 5,552     5,552                  
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],[30]       3,599                  
Fair Value, Ending Balance 3,599 [18],[21] 3,599 [15],[30]   3,599 [18],[21]   3,599 [15],[30]              
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       401                  
Fair Value, Ending Balance 401 [18],[19] 401 [15],[16]   401 [18],[19]   401 [15],[16]              
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Second lien                          
Principal amount or par value 7 [18],[19],[22] 5 [15],[16],[24]   7 [18],[19],[22]   5 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       0                  
Fair Value, Ending Balance 7 [18],[19] 0 [15],[16]   7 [18],[19]   0 [15],[16]              
Investment, Identifier [Axis]: Specialtycare, Inc., First lien                          
Principal amount or par value [15],[24],[30]   10,458       10,458              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       10,019                  
Fair Value, Ending Balance [15],[30]   10,019       10,019              
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 1                          
Principal amount or par value [15],[16],[24],[25]   212       212              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       204                  
Fair Value, Ending Balance [15],[16],[25]   204       204              
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 2                          
Principal amount or par value [15],[16],[24],[25]   79       79              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       75                  
Fair Value, Ending Balance [15],[16],[25]   75       75              
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn                          
Principal amount or par value [18],[19],[22],[23] 559     559                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] (24)     (24)                  
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 1                          
Principal amount or par value [15],[16],[24],[25]   347       347              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (15)                  
Fair Value, Ending Balance [15],[16],[25]   (15)       (15)              
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 2                          
Principal amount or par value [15],[16],[24],[25]   868       868              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (36)                  
Fair Value, Ending Balance [15],[16],[25]   (36)       (36)              
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 1                          
Principal amount or par value [18],[21],[22] 10,405     10,405                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 9,959     9,959                  
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 2                          
Principal amount or par value [18],[19],[22] 78     78                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19] 75     75                  
Investment, Identifier [Axis]: Spring Education Group, Inc (fka SSH Group Holdings, Inc.), Second lien                          
Principal amount or par value [15],[24],[30]   21,959       21,959              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       21,324                  
Fair Value, Ending Balance [15],[30]   21,324       21,324              
Investment, Identifier [Axis]: Spring Education Group, Inc. (fka SSH Group Holdings, Inc.), Second lien                          
Principal amount or par value [18],[21],[22] 21,959     21,959                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21] 21,791     21,791                  
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien                          
Principal amount or par value 3,965 [18],[21],[22] 3,985 [15],[24],[30]   3,965 [18],[21],[22]   3,985 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       3,917                  
Fair Value, Ending Balance 3,861 [18],[21] 3,917 [15],[30]   3,861 [18],[21]   3,917 [15],[30]              
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn                          
Principal amount or par value [15],[24],[25],[30]   2,791       2,791              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       2,744                  
Fair Value, Ending Balance [15],[25],[30]   2,744       2,744              
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn 1                          
Principal amount or par value [18],[21],[22],[23] 2,802     2,802                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[21],[23] 2,729     2,729                  
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn 2                          
Principal amount or par value [18],[19],[22],[23] 34     34                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 33     33                  
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 1                          
Principal amount or par value 127 [18],[21],[22],[23] 559 [15],[16],[24],[25]   127 [18],[21],[22],[23]   559 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (9)                  
Fair Value, Ending Balance (3) [18],[21],[23] (9) [15],[16],[25]   (3) [18],[21],[23]   (9) [15],[16],[25]              
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 2                          
Principal amount or par value 526 [18],[19],[22],[23] 152 [15],[24],[25],[30]   526 [18],[19],[22],[23]   152 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       (3)                  
Fair Value, Ending Balance (14) [18],[19],[23] (3) [15],[25],[30]   $ (14) [18],[19],[23]   $ (3) [15],[25],[30]              
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],[27]       $ 11,396                  
Fair Value, Ending Balance 12,014 [18],[26],[83] 11,396 [15],[27]   12,014 [18],[26],[83]   $ 11,396 [15],[27]              
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 4,142 [18],[19],[83] 3,929 [15],[16]   4,142 [18],[19],[83]   3,929 [15],[16]              
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                          
Principal amount or par value 22,500 [18],[22],[26] 22,500 [15],[24],[27]   22,500 [18],[22],[26]   22,500 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       21,067                  
Fair Value, Ending Balance 21,515 [18],[26] 21,067 [15],[27]   21,515 [18],[26]   21,067 [15],[27]              
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                          
Principal amount or par value 5,697 [18],[21],[22] 5,697 [15],[24],[30]   5,697 [18],[21],[22]   5,697 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       5,334                  
Fair Value, Ending Balance 5,447 [18],[21] 5,334 [15],[30]   5,447 [18],[21]   5,334 [15],[30]              
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                          
Principal amount or par value 16,311 [18],[21],[22] 16,395 [15],[24],[30]   16,311 [18],[21],[22]   16,395 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       10,657                  
Fair Value, Ending Balance 10,717 [18],[21] 10,657 [15],[30]   10,717 [18],[21]   10,657 [15],[30]              
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                          
Principal amount or par value 15,732 [18],[22],[28] 15,813 [15],[24],[29]   15,732 [18],[22],[28]   15,813 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       10,277                  
Fair Value, Ending Balance 10,335 [18],[28] 10,277 [15],[29]   10,335 [18],[28]   10,277 [15],[29]              
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC), Second lien                          
Principal amount or par value 7,950 [18],[21],[22] 7,950 [15],[24],[30]   7,950 [18],[21],[22]   7,950 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       7,488                  
Fair Value, Ending Balance 7,607 [18],[21] 7,488 [15],[30]   $ 7,607 [18],[21]   $ 7,488 [15],[30]              
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 112,558 [18],[19] 110,314 [15],[16]   112,558 [18],[19]   $ 110,314 [15],[16]              
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien - Undrawn                          
Principal amount or par value 4,439 [18],[19],[22],[23] 4,439 [15],[16],[24],[25]   4,439 [18],[19],[22],[23]   4,439 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25],[37]       (71)                  
Fair Value, Ending Balance (34) [18],[19],[23],[38] (71) [15],[16],[25],[37]   (34) [18],[19],[23],[38]   (71) [15],[16],[25],[37]              
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 1                          
Principal amount or par value 35,000 [18],[21],[22] 35,000 [15],[24],[30]   35,000 [18],[21],[22]   35,000 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       34,436                  
Fair Value, Ending Balance 34,734 [18],[21] 34,436 [15],[30]   34,734 [18],[21]   34,436 [15],[30]              
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 2                          
Principal amount or par value 24,189 [18],[22],[28] 24,189 [15],[24],[29]   24,189 [18],[22],[28]   24,189 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       23,800                  
Fair Value, Ending Balance 24,006 [18],[28] 23,800 [15],[29]   24,006 [18],[28]   23,800 [15],[29]              
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 16,361 15,562   16,361   15,562 £ 12,879 [18],[19],[22],[84]   £ 12,879 [15],[16],[24],[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 16,361 [18],[19],[84] 15,562 [15],[16],[85]   16,361 [18],[19],[84]   15,562 [15],[16],[85]              
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                          
Principal amount or par value | £             £ 10,618 [18],[19],[22],[84]   £ 10,538 [15],[16],[24],[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 13,488 [18],[19],[84] 12,734 [15],[16],[85]   13,488 [18],[19],[84]   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 14,260     14,260                  
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                          
Principal amount or par value 10,184 [18],[19],[22] 10,184 [15],[16],[24]   10,184 [18],[19],[22]   10,184 [15],[16],[24]              
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 [18],[19]   10,184 [15],[16]              
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                          
Principal amount or par value 6,293 [18],[19],[22] 6,246 [15],[16],[24]   6,293 [18],[19],[22]   6,246 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       6,246                  
Fair Value, Ending Balance 6,293 [18],[19] 6,246 [15],[16]   6,293 [18],[19]   6,246 [15],[16]              
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                          
Principal amount or par value | €               € 708 [18],[19],[22],[84]   € 708 [15],[16],[24],[85]      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[85]       757                  
Fair Value, Ending Balance 772 [18],[19],[84] 757 [15],[16],[85]   772 [18],[19],[84]   757 [15],[16],[85]              
Investment, Identifier [Axis]: The Kleinfelder Group, Inc., First lien                          
Principal amount or par value 16,438 [18],[22],[26] 16,533 [15],[24],[27]   16,438 [18],[22],[26]   16,533 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       16,241                  
Fair Value, Ending Balance 16,438 [18],[26] 16,241 [15],[27]   16,438 [18],[26]   16,241 [15],[27]              
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                          
Principal amount or par value 29,868 [18],[22],[28] 29,868 [15],[24],[29]   29,868 [18],[22],[28]   29,868 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       29,151                  
Fair Value, Ending Balance 29,307 [18],[28] 29,151 [15],[29]   29,307 [18],[28]   29,151 [15],[29]              
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                          
Principal amount or par value 823 [18],[21],[22],[23] 277 [15],[24],[25],[30]   823 [18],[21],[22],[23]   277 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       270                  
Fair Value, Ending Balance 807 [18],[21],[23] 270 [15],[25],[30]   807 [18],[21],[23]   270 [15],[25],[30]              
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                          
Principal amount or par value 1,416 [18],[21],[22],[23] 955 [15],[24],[25],[30]   1,416 [18],[21],[22],[23]   955 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       (23)                  
Fair Value, Ending Balance (27) [18],[21],[23] (23) [15],[25],[30]   (27) [18],[21],[23]   (23) [15],[25],[30]              
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                          
Principal amount or par value 4,267 [18],[19],[22],[23] 4,267 [15],[16],[24],[25]   4,267 [18],[19],[22],[23]   4,267 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (102)                  
Fair Value, Ending Balance (80) [18],[19],[23] (102) [15],[16],[25]   (80) [18],[19],[23]   (102) [15],[16],[25]              
Investment, Identifier [Axis]: Transcendia Holdings, Inc., Second lien                          
Principal amount or par value 14,500 [18],[22],[28] 14,500 [15],[24],[29]   14,500 [18],[22],[28]   14,500 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       12,418                  
Fair Value, Ending Balance 11,600 [18],[28] 12,418 [15],[29]   11,600 [18],[28]   12,418 [15],[29]              
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien                          
Principal amount or par value 15,382 [18],[21],[22] 15,382 [15],[24],[30]   15,382 [18],[21],[22]   15,382 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       15,257                  
Fair Value, Ending Balance 15,382 [18],[21] 15,257 [15],[30]   15,382 [18],[21]   15,257 [15],[30]              
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                          
Principal amount or par value 3,095 [18],[21],[22],[23] 2,889 [15],[24],[25],[30]   3,095 [18],[21],[22],[23]   2,889 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       2,865                  
Fair Value, Ending Balance 3,095 [18],[21],[23] 2,865 [15],[25],[30]   3,095 [18],[21],[23]   2,865 [15],[25],[30]              
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                          
Principal amount or par value 1,501 [18],[19],[22],[23] 1,501 [15],[16],[24],[25]   1,501 [18],[19],[22],[23]   1,501 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (12)                  
Fair Value, Ending Balance 0 [18],[19],[23] (12) [15],[16],[25]   0 [18],[19],[23]   (12) [15],[16],[25]              
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                          
Principal amount or par value 2,157 [18],[21],[22],[23] 2,364 [15],[24],[25],[30]   2,157 [18],[21],[22],[23]   2,364 [15],[24],[25],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[30]       (19)                  
Fair Value, Ending Balance 0 [18],[21],[23] (19) [15],[25],[30]   0 [18],[21],[23]   (19) [15],[25],[30]              
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                          
Principal amount or par value 893 [18],[19],[22],[23] 893 [15],[16],[24],[25]   893 [18],[19],[22],[23]   893 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (29)                  
Fair Value, Ending Balance (29) [18],[19],[23] (29) [15],[16],[25]   (29) [18],[19],[23]   (29) [15],[16],[25]              
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                          
Principal amount or par value 11,254 [18],[21],[22] 11,311 [15],[24],[30]   11,254 [18],[21],[22]   11,311 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       10,945                  
Fair Value, Ending Balance 10,882 [18],[21] 10,945 [15],[30]   10,882 [18],[21]   10,945 [15],[30]              
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                          
Principal amount or par value 1,465 [18],[19],[22] 1,473 [15],[16],[24]   1,465 [18],[19],[22]   1,473 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       1,425                  
Fair Value, Ending Balance 1,417 [18],[19] 1,425 [15],[16]   $ 1,417 [18],[19]   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],[24],[30]   22,367       22,367              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       $ 22,367                  
Fair Value, Ending Balance [15],[30]   22,367       22,367              
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 2                          
Principal amount or par value [15],[24],[30]   3,949       3,949              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       3,949                  
Fair Value, Ending Balance [15],[30]   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     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],[30]       0                  
Fair Value, Ending Balance 0 [18],[21] 0 [15],[30]   0 [18],[21]   0 [15],[30]              
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       0                  
Fair Value, Ending Balance 0 [18],[19] 0 [15],[16]   0 [18],[19]   0 [15],[16]              
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[86]       11,626                  
Fair Value, Ending Balance 13,030 [18],[19],[87] 11,626 [15],[16],[86]   $ 13,030 [18],[19],[87]   $ 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 8,215 [18],[19],[87] 7,670 [15],[16],[86]   8,215 [18],[19],[87]   $ 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],[73],[88]       6,491                  
Fair Value, Ending Balance 9,488 [18],[19],[71],[89] 6,491 [15],[16],[73],[88]   9,488 [18],[19],[71],[89]   $ 6,491 [15],[16],[73],[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],[30],[73],[90]       0                  
Fair Value, Ending Balance 0 [18],[21],[71],[91] 0 [15],[30],[73],[90]   $ 0 [18],[21],[71],[91]   $ 0 [15],[30],[73],[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],[73],[90]       $ 0                  
Fair Value, Ending Balance 0 [18],[19],[71],[91] 0 [15],[16],[73],[90]   0 [18],[19],[71],[91]   $ 0 [15],[16],[73],[90]              
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                          
Principal amount or par value 12,464 [18],[19],[22] 11,575 [15],[16],[24]   12,464 [18],[19],[22]   11,575 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       10,384                  
Fair Value, Ending Balance 11,096 [18],[19] 10,384 [15],[16]   11,096 [18],[19]   10,384 [15],[16]              
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                          
Principal amount or par value 5,526 [18],[19],[22] 5,131 [15],[16],[24]   5,526 [18],[19],[22]   5,131 [15],[16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16]       4,603                  
Fair Value, Ending Balance 4,919 [18],[19] 4,603 [15],[16]   4,919 [18],[19]   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 9,488     9,488                  
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 47,355 [18],[19] 36,680 [15],[16]   47,355 [18],[19]   36,680 [15],[16]              
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 1                          
Principal amount or par value 16,183 [18],[21],[22] 16,183 [15],[24],[30]   16,183 [18],[21],[22]   16,183 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       15,711                  
Fair Value, Ending Balance 15,623 [18],[21] 15,711 [15],[30]   15,623 [18],[21]   15,711 [15],[30]              
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 2                          
Principal amount or par value 10,000 [18],[22],[26] 10,000 [15],[24],[27]   10,000 [18],[22],[26]   10,000 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       9,708                  
Fair Value, Ending Balance 9,654 [18],[26] 9,708 [15],[27]   9,654 [18],[26]   9,708 [15],[27]              
Investment, Identifier [Axis]: Vectra Co., Second lien                          
Principal amount or par value 10,788 [18],[22],[28] 10,788 [15],[24],[29]   10,788 [18],[22],[28]   10,788 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       7,004                  
Fair Value, Ending Balance 7,539 [18],[28] 7,004 [15],[29]   7,539 [18],[28]   7,004 [15],[29]              
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                          
Principal amount or par value 7,000 [19],[22] 5,000 [16],[24]   7,000 [19],[22]   5,000 [16],[24]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [16]       3,817                  
Fair Value, Ending Balance 5,723 [19] 3,817 [16]   5,723 [19]   3,817 [16]              
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn                          
Principal amount or par value 11,159 [18],[21],[22],[23] 7,478 [15],[16],[24],[25]   11,159 [18],[21],[22],[23]   7,478 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       7,430                  
Fair Value, Ending Balance 11,159 [18],[21],[23] 7,430 [15],[16],[25]   11,159 [18],[21],[23]   7,430 [15],[16],[25]              
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                          
Principal amount or par value 2,040 [18],[19],[22],[23] 2,040 [15],[16],[24],[25]   2,040 [18],[19],[22],[23]   2,040 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (13)                  
Fair Value, Ending Balance 0 [18],[19],[23] (13) [15],[16],[25]   0 [18],[19],[23]   (13) [15],[16],[25]              
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                          
Principal amount or par value 4,624 [18],[21],[22],[23] 8,327 [15],[16],[24],[25]   4,624 [18],[21],[22],[23]   8,327 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (53)                  
Fair Value, Ending Balance 0 [18],[21],[23] (53) [15],[16],[25]   0 [18],[21],[23]   (53) [15],[16],[25]              
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                          
Principal amount or par value 18,853 [18],[21],[22] 18,949 [15],[24],[30]   18,853 [18],[21],[22]   18,949 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       18,827                  
Fair Value, Ending Balance 18,853 [18],[21] 18,827 [15],[30]   18,853 [18],[21]   18,827 [15],[30]              
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                          
Principal amount or par value 1,247 [18],[21],[22] 1,254 [15],[24],[30]   1,247 [18],[21],[22]   1,254 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       1,246                  
Fair Value, Ending Balance 1,247 [18],[21] 1,246 [15],[30]   1,247 [18],[21]   1,246 [15],[30]              
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                          
Principal amount or par value 836 [18],[21],[22] 841 [15],[24],[30]   836 [18],[21],[22]   841 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       835                  
Fair Value, Ending Balance 836 [18],[21] 835 [15],[30]   836 [18],[21]   835 [15],[30]              
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subordinated                          
Principal amount or par value [18],[19],[22] 3,333     3,333                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19] 3,271     3,271                  
Investment, Identifier [Axis]: Xactly Corporation, First lien                          
Principal amount or par value 22,500 [18],[22],[26] 19,047 [15],[24],[27]   22,500 [18],[22],[26]   19,047 [15],[24],[27]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[27]       19,047                  
Fair Value, Ending Balance 22,500 [18],[26] 19,047 [15],[27]   22,500 [18],[26]   19,047 [15],[27]              
Investment, Identifier [Axis]: Xactly Corporation, First lien - Drawn                          
Principal amount or par value [15],[16],[24],[25]   992       992              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       992                  
Fair Value, Ending Balance [15],[16],[25]   992       992              
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                          
Principal amount or par value [18],[19],[22],[23] 992     992                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 0     0                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn                          
Principal amount or par value [15],[24],[25],[42]   495       495              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[42]       482                  
Fair Value, Ending Balance [15],[25],[42]   482       482              
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 1                          
Principal amount or par value [18],[22],[23],[41] 1,027     1,027                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[23],[41] 1,000     1,000                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 2                          
Principal amount or par value [18],[19],[22],[23] 278     278                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] 271     271                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn                          
Principal amount or par value [15],[24],[25],[42]   1,584       1,584              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[42]       (41)                  
Fair Value, Ending Balance [15],[25],[42]   (41)       (41)              
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                          
Principal amount or par value [18],[19],[22],[23],[41] 1,048     1,048                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23],[41] (27)     (27)                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                          
Principal amount or par value [18],[19],[22],[23] 3,690     3,690                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [18],[19],[23] (97)     (97)                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 1                          
Principal amount or par value 17,769 [18],[22],[41] 17,861 [15],[24],[42]   17,769 [18],[22],[41]   17,861 [15],[24],[42]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[42]       17,393                  
Fair Value, Ending Balance 17,304 [18],[41] 17,393 [15],[42]   17,304 [18],[41]   17,393 [15],[42]              
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 2                          
Principal amount or par value 2,314 [18],[22],[41] 2,326 [15],[24],[42]   2,314 [18],[22],[41]   2,326 [15],[24],[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]   2,253 [18],[41]   2,265 [15],[42]              
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien) - Undrawn                          
Principal amount or par value [15],[16],[24],[25]   3,968       3,968              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (104)                  
Fair Value, Ending Balance [15],[16],[25]   (104)       (104)              
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Drawn                          
Principal amount or par value [15],[18],[19],[22] 471     471                  
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Ending Balance [15],[18],[19] 462     462                  
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                          
Principal amount or par value 7,267 [18],[22],[23],[28] 11,763 [15],[24],[25],[29]   7,267 [18],[22],[23],[28]   11,763 [15],[24],[25],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[25],[29]       0                  
Fair Value, Ending Balance 0 [18],[23],[28] 0 [15],[25],[29]   0 [18],[23],[28]   0 [15],[25],[29]              
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                          
Principal amount or par value 2,347 [18],[19],[22],[23] 4,218 [15],[16],[24],[25]   2,347 [18],[19],[22],[23]   4,218 [15],[16],[24],[25]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[16],[25]       (37)                  
Fair Value, Ending Balance (42) [18],[19],[23] (37) [15],[16],[25]   (42) [18],[19],[23]   (37) [15],[16],[25]              
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                          
Principal amount or par value 30,182 [18],[22],[28] 44,287 [15],[24],[29]   30,182 [18],[22],[28]   44,287 [15],[24],[29]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[29]       43,901                  
Fair Value, Ending Balance 30,182 [18],[28] 43,901 [15],[29]   30,182 [18],[28]   43,901 [15],[29]              
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                          
Principal amount or par value 7,366 [18],[21],[22] 7,366 [15],[24],[30]   7,366 [18],[21],[22]   7,366 [15],[24],[30]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair Value, Beginning Balance [15],[30]       7,311                  
Fair Value, Ending Balance $ 7,366 [18],[21] $ 7,311 [15],[30]   $ 7,366 [18],[21]   $ 7,311 [15],[30]              
[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 June 30, 2023 and December 31, 2022 along with transactions during the six months ended June 30, 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 June 30, 2023Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC$— $15,581 $(459)$(11)$15,111 $— $354 $— $— 
Permian Holdco 3, Inc. / Permian Trust— — — — — — — — — 
Sierra Hamilton Holdings Corporation4,000 2 — 5 4,007 — 2 — 1 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC126,787 3,364 — (9)130,142 — 1,441 2,244 125 
Total Non-Controlled/Affiliated Investments$130,787 $18,947 $(459)$(15)$149,260 $— $1,797 $2,244 $126 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind ("PIK") interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[9] Denotes investments in which the Company is in “Control”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of December 31, 2022 and December 31, 2021 along with transactions during the year ended December 31, 2022 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2021Gross
Additions
(A)		Gross
Redemptions
(B)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2022Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Edmentum Inc.$— $— $— $— $— $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 June 30, 2023 and December 31, 2022, along with transactions during the six months ended June 30, 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 June 30, 2023Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC $35,788 $— $— $(29,094)$6,694 $29,255 $— $— $1,020 
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 13,096 — (509)126,733 — 5,424 — 750 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.57,564 3,183 — — 60,747 — 2,744 — 256 
NM APP Canada Corp.— — — 7 7 — — — — 
NM CLFX LP16,172 — (259)(1,848)14,065 — — 858 — 
NM NL Holdings, L.P.94,305 — — 1,467 95,772 — — 4,285 — 
NM GP Holdco, LLC1,028 — — 13 1,041 — — 42 — 
NM YI LLC9,481 — — (17)9,464 — — 425 — 
NMFC Senior Loan Program III LLC140,000 — — — 140,000 — — 9,800 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 7,728 — 
UniTek Global Services, Inc.103,770 4,512 (26,446)12,267 94,103 2 2,593 2,522 544 
Total Controlled Investments$690,035 $20,791 $(44,109)$(691)$666,026 $11,853 $10,761 $25,660 $2,570 
(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] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[21] 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.
[22] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[23] 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.
[24] Par amount is denominated in United States Dollar unless otherwise noted, British Pound ("£") and/or Euro ("€").
[25] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[26] Investment is held in New Mountain Finance SBIC, L.P.
[27] Investment is held in New Mountain Finance SBIC, L.P.
[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 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.
[30] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, 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.
[31] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, a first lien delayed draw and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum.
[32] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, a first lien delayed draw and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum.
[33] Investment is held in 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 June 30, 2023, 15.8% 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 FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and two first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[48] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and three first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[49] Investment is held in NMF HB, Inc
[50] 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.
[51] Investment is held in NMF HB, Inc.
[52] The Company holds preferred equity in HB Wealth Management, LLC that is entitled to receive cumulative preferential dividends at a rate of 4.0% per annum.
[53] Investment is held in NMF TRM, LLC.
[54] Investment is held in NMF TRM, LLC.
[55] Investment is held in NMF QID NGL Holdings, Inc.
[56] Investment is held in NMF QID NGL Holdings, Inc.
[57] The Company holds investments in multiple entities of Haven Midstream Holdings LLC. The Company holds 4.6% of the Class B profits interest in QID NGL, LLC (which at closing represented 97% 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.
[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 97.0% 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 first lien revolver in Haven Midstream LLC.
[59] 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
[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 ordinary shares and warrants in NHME Holdings Corp., as well as a Tranche A Term Loan and Tranche B Term Loan in National HME, Inc., a whollyowned subsidiary of NHME Holdings Corp.
[62] 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.
[63] Investment is held in New Mountain Net Lease Corporation.
[64] Investment is held in New Mountain Net Lease Corporation.
[65] 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.
[66] The Company holds ordinary shares in OA Topco, L.P., and two first lien term loans and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[67] Investment is held in NMF OEC, Inc.
[68] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC. The preferred equity is entitled to receive prefenential dividends of 11.00% per annum.
[69] Investment is held in NMF OEC, Inc.
[70] 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 preferential dividends of 11.0% per annum.
[71] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[72] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,500 as of June 30, 2023. See Note 2. Summary of Significant Accounting Policies, for details.
[73] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[74] 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.
[75] Investment is held in NMF Permian Holdings, LLC.
[76] Investment is held in NMF Permian Holdings, LLC.
[77] 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.
[78] The Company holds ordinary shares in Pioneer Topco I, L.P., and two first lien term loans and a first lien revolver in Pioneer Buyer I, LLC, a wholly-owned subsidiary of Pioneer Topco I, L.P.
[79] Investment is held in NMF Pioneer, Inc.
[80] Investment is held in NMF Pioneer, Inc.
[81] 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.
[82] The Company holds preferred equity in Project Essential Super Parent, Inc. that is entitled to receive cumulative preferential dividends at a rate of SOFR + 9.5% per annum.
[83] The Company holds preferred equity in Symplr Software Intermediate Holdings, Inc. that is entitled to receive cumulative preferential dividends at a rate of SOFR + 10.5% per annum.
[84] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of June 30, 2023, the par value U.S. dollar equivalent of the first lien term loan and drawn first lien term loan is $16,361 and $14,260, 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.