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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
investment
numberOfAgreement
Dec. 31, 2022
USD ($)
numberOfAgreement
investment
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
investment
numberOfAgreement
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
numberOfAgreement
investment
Sep. 30, 2023
GBP (£)
investment
numberOfAgreement
Sep. 30, 2023
EUR (€)
investment
numberOfAgreement
Dec. 31, 2022
GBP (£)
numberOfAgreement
investment
Dec. 31, 2022
EUR (€)
numberOfAgreement
investment
Jun. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | numberOfAgreement 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) (16,939)   $ (24,937) (18,345) $ (68,259)                  
Fair Value, ending balance 3,111,903 [2] $ 3,221,247 [1]   3,111,903 [2]   $ 3,221,247 [1]                
Net Realized Gains (Losses) $ 4,673   (388) $ 7,917 35,687                  
Investments at fair value that are non-qualifying assets as a percentage of total assets 15.90% 15.30%   15.90%   15.30% 15.90% 15.90% 15.30% 15.30%        
QID NGL, LLC | Common Class B                            
Ownership percentage       4.60%   4.60%                
QID TRH Holdings, LLC | Common Class B                            
Ownership percentage       97.00%   97.00%                
NMFC Senior Loan Program III LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Dividend Income $ 4,900   3,938 $ 14,700 12,935                  
NMFC Senior Loan Program IV LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Dividend Income 3,653   3,161 11,381 9,520                  
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       20,384 [4]   5,168 [5]                
Gross Redemptions       (466) [6]   0 [7]                
Net Change In Unrealized Appreciation (Depreciation)       (14,830)   (9,156)                
Fair Value, ending balance 135,875 [8] $ 130,787 [3]   135,875 [8]   130,787 [3]                
Net Realized Gains (Losses)       0   0                
Interest Income       2,946   2,105                
Dividend Income       3,417   4,109                
Other Income 63   62 189 187 250                
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)       (10)                    
Fair Value, ending balance 15,112 0   15,112   0                
Net Realized Gains (Losses)       0                    
Interest Income       717                    
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       (7) [6]   0 [7]                
Net Change In Unrealized Appreciation (Depreciation)       (1,995)   0                
Fair Value, ending balance 2,000 4,000   2,000   4,000                
Net Realized Gains (Losses)       0   0                
Interest Income       1   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       4,801 [4]   5,168 [5]                
Gross Redemptions       0 [6]   0 [7]                
Net Change In Unrealized Appreciation (Depreciation)       (12,825)   (9,156)                
Fair Value, ending balance 118,763 126,787   118,763   126,787                
Net Realized Gains (Losses)       0   0                
Interest Income       2,228   2,105                
Dividend Income       3,417   4,109                
Other Income       188   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       27,047 [10]   22,952 [11]                
Gross Redemptions       (44,112) [12]   (94,946) [13]                
Net Change In Unrealized Appreciation (Depreciation)       (15,174)   6,219                
Fair Value, ending balance 657,796 [14] 690,035 [9]   657,796 [14]   690,035 [9]                
Net Realized Gains (Losses)       16,413   53,440                
Interest Income       15,703   13,954                
Dividend Income       38,058   47,512                
Other Income 1,373   $ 2,221 3,943 7,235 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)       (33,654)   35,787                
Fair Value, ending balance 2,134 35,788   2,134   35,788                
Net Realized Gains (Losses)       33,815   12,802                
Interest Income       0   6,316                
Dividend Income       0   0                
Other Income       1,530   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)       15,023   (13,805)                
Fair Value, ending balance 3,000 5,381   3,000   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       16,118 [10]   5,914 [11]                
Gross Redemptions       0 [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)       (780)   (1,363)                
Fair Value, ending balance 129,484 114,146   129,484   114,146                
Net Realized Gains (Losses)       0   0                
Interest Income       8,474   8,057                
Dividend Income       0   0                
Other Income       1,125   1,500                
Controlled | New Permian Holdco, Inc. / New Permian Holdco, L.L.C.                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance       57,564 34,759 34,759                
Gross Additions       4,371 [10]   7,805 [11]                
Gross Redemptions       0 [12]   0 [13]                
Net Change In Unrealized Appreciation (Depreciation)       0   15,000                
Fair Value, ending balance 61,935 57,564   61,935   57,564                
Net Realized Gains (Losses)       0   0                
Interest Income       3,946   4,504                
Dividend Income       0   0                
Other Income       381   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)       (4,221)   (8,504)                
Fair Value, ending balance 11,692 16,172   11,692   16,172                
Net Realized Gains (Losses)       0   0                
Interest Income       0   0                
Dividend Income       1,082   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)       1,587   (2,733)                
Fair Value, ending balance 95,892 94,305   95,892   94,305                
Net Realized Gains (Losses)       0   0                
Interest Income       0   0                
Dividend Income       6,318   8,453                
Other Income       0   0                
Controlled | NM GP Holdco, LLC                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance       1,028 1,197 1,197                
Gross Additions       0 [10]   1 [11]                
Gross Redemptions       0 [12]   (138) [13]                
Net Change In Unrealized Appreciation (Depreciation)       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       65   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)       (32)   1,195                
Fair Value, ending balance 9,449 9,481   9,449   9,481                
Net Realized Gains (Losses)       0   0                
Interest Income       0   0                
Dividend Income       635   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       14,700   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       11,381   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       6,558 [10]   13,378 [11]                
Gross Redemptions       (26,449) [12]   (1,549) [13]                
Net Change In Unrealized Appreciation (Depreciation)       6,883   24,306                
Fair Value, ending balance 90,762 103,770   90,762   103,770                
Net Realized Gains (Losses)       2   0                
Interest Income       3,283   4,738                
Dividend Income       3,877   4,363                
Other Income       907   724                
Investment, Identifier [Axis]: AAC Lender Holdings, LLC, Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[17]       0                    
Fair Value, ending balance 0 [18],[19] 0 [15],[16],[17]   0 [18],[19]   0 [15],[16],[17]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 1                            
Principal amount or par value 20,851 [18],[20],[21],[22] 12,357 [15],[16],[23],[24]   20,851 [18],[20],[21],[22]   12,357 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       12,204                    
Fair Value, ending balance 20,601 [18],[20],[22] 12,204 [15],[16],[24]   20,601 [18],[20],[22]   12,204 [15],[16],[24]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 2                            
Principal amount or par value 6,765 [18],[21],[22],[25] 4,009 [15],[23],[24],[26]   6,765 [18],[21],[22],[25]   4,009 [15],[23],[24],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[26]       3,959                    
Fair Value, ending balance 6,684 [18],[22],[25] 3,959 [15],[24],[26]   6,684 [18],[22],[25]   3,959 [15],[24],[26]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                            
Principal amount or par value [15],[23],[24],[26]   4,231       4,231                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[26]       (52)                    
Fair Value, ending balance [15],[24],[26]   (52)       (52)                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 1                            
Principal amount or par value 1,434 [18],[21],[22],[25] 3,659 [15],[16],[23],[24]   1,434 [18],[21],[22],[25]   3,659 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (45)                    
Fair Value, ending balance (17) [18],[22],[25] (45) [15],[16],[24]   (17) [18],[22],[25]   (45) [15],[16],[24]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 2                            
Principal amount or par value 3,659 [18],[19],[21],[22] 13,041 [15],[16],[23],[24]   3,659 [18],[19],[21],[22]   13,041 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (162)                    
Fair Value, ending balance (44) [18],[19],[22] (162) [15],[16],[24]   (44) [18],[19],[22]   (162) [15],[16],[24]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn 3                            
Principal amount or par value [18],[20],[21],[22] 4,421     4,421                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20],[22] (53)     (53)                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                            
Principal amount or par value 20,478 [18],[21],[27] 20,634 [15],[23],[28]   20,478 [18],[21],[27]   20,634 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       20,378                    
Fair Value, ending balance 20,232 [18],[27] 20,378 [15],[28]   20,232 [18],[27]   20,378 [15],[28]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                            
Principal amount or par value 9,723 [18],[21],[25] 9,797 [15],[23],[26]   9,723 [18],[21],[25]   9,797 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       9,676                    
Fair Value, ending balance 9,606 [18],[25] 9,676 [15],[26]   9,606 [18],[25]   9,676 [15],[26]                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                            
Principal amount or par value 13,616 [18],[19],[21] 12,494 [15],[16],[23]   13,616 [18],[19],[21]   12,494 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       11,908                    
Fair Value, ending balance 12,831 [18],[19] 11,908 [15],[16]   12,831 [18],[19]   11,908 [15],[16]                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                            
Principal amount or par value 5,340 [18],[21],[25] 4,900 [15],[23],[26]   5,340 [18],[21],[25]   4,900 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       4,670                    
Fair Value, ending balance 5,032 [18],[25] 4,670 [15],[26]   5,032 [18],[25]   4,670 [15],[26]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien                            
Principal amount or par value [15],[23],[29]   22,082       22,082                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       21,338                    
Fair Value, ending balance [15],[29]   21,338       21,338                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                            
Principal amount or par value [18],[19],[21],[22] 883     883                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 864     864                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 1                            
Principal amount or par value [15],[16],[23],[24]   2,840       2,840                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       2,744                    
Fair Value, ending balance [15],[16],[24]   2,744       2,744                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 2                            
Principal amount or par value [15],[16],[23],[24]   259       259                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       250                    
Fair Value, ending balance [15],[16],[24]   250       250                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value 2,354 [18],[19],[21],[22] 2,095 [15],[16],[23],[24]   2,354 [18],[19],[21],[22]   2,095 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (71)                    
Fair Value, ending balance (51) [18],[19],[22] (71) [15],[16],[24]   (51) [18],[19],[22]   (71) [15],[16],[24]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                            
Principal amount or par value 3,427 [18],[19],[21],[22] 5,386 [15],[16],[23],[24]   3,427 [18],[19],[21],[22]   5,386 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (181)                    
Fair Value, ending balance (74) [18],[19],[22] (181) [15],[16],[24]   (74) [18],[19],[22]   $ (181) [15],[16],[24]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 1                            
Principal amount or par value [18],[20],[21] 22,080     22,080                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 21,606     21,606                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 2                            
Principal amount or par value [18],[19],[21] 3,913     3,913                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19] 3,829     $ 3,829                    
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares                            
Preferred equity dividend rate       11.75%   11.75%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[30]       $ 14,068                    
Fair Value, ending balance 14,178 [18],[19],[31] 14,068 [15],[16],[30]   14,178 [18],[19],[31]   $ 14,068 [15],[16],[30]                
Investment, Identifier [Axis]: ADG, LLC, Second lien                            
Principal amount or par value [15],[16],[23]   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],[21],[27] 13,444 [15],[23],[28]   13,444 [18],[21],[27]   13,444 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       13,444                    
Fair Value, ending balance 13,444 [18],[27] 13,444 [15],[28]   13,444 [18],[27]   13,444 [15],[28]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Drawn                            
Principal amount or par value [18],[19],[21],[22] 770     770                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 770     770                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 1                            
Principal amount or par value 1,969 [18],[19],[21],[22] 1,969 [15],[16],[23],[24]   1,969 [18],[19],[21],[22]   1,969 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (39)                    
Fair Value, ending balance 0 [18],[19],[22] (39) [15],[16],[24]   0 [18],[19],[22]   (39) [15],[16],[24]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn 2                            
Principal amount or par value 8,764 [18],[19],[21],[22] 11,718 [15],[16],[23],[24]   8,764 [18],[19],[21],[22]   11,718 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (234)                    
Fair Value, ending balance 0 [18],[19],[22] (234) [15],[16],[24]   0 [18],[19],[22]   (234) [15],[16],[24]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                            
Principal amount or par value 22,153 [18],[20],[21] 22,321 [15],[23],[29]   22,153 [18],[20],[21]   22,321 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       21,875                    
Fair Value, ending balance 22,153 [18],[20] 21,875 [15],[29]   22,153 [18],[20]   21,875 [15],[29]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                            
Principal amount or par value 6,164 [18],[20],[21] 4,024 [15],[23],[29]   6,164 [18],[20],[21]   4,024 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       3,943                    
Fair Value, ending balance 6,164 [18],[20] 3,943 [15],[29]   6,164 [18],[20]   3,943 [15],[29]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                            
Principal amount or par value $ 31,406     $ 31,406                    
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],[21],[22] 2,652 [15],[16],[23],[24]   $ 2,652 [18],[19],[21],[22]   2,652 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[17],[24]       0                    
Fair Value, ending balance 0 [18],[19],[22],[32] 0 [15],[16],[17],[24]   0 [18],[19],[22],[32]   0 [15],[16],[17],[24]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                            
Principal amount or par value 29,879 [18],[20],[21] 28,829 [15],[23],[29]   29,879 [18],[20],[21]   28,829 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       20,599                    
Fair Value, ending balance 20,586 [18],[20] 20,599 [15],[29]   20,586 [18],[20]   20,599 [15],[29]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                            
Principal amount or par value 1,527 [18],[19],[21] 1,527 [15],[16],[23]   1,527 [18],[19],[21]   1,527 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       0                    
Fair Value, ending balance 0 [18],[19] 0 [15],[16]   0 [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 17,927     17,927               $ 13,479    
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 20,586     20,586                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                            
Principal amount or par value 5,230 [18],[19],[21] 5,230 [15],[16],[23]   5,230 [18],[19],[21]   5,230 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       0                    
Fair Value, ending balance 0 [18],[19] 0 [15],[16]   0 [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],[20],[21] 33,618 [15],[23],[29]   8,618 [18],[20],[21]   33,618 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       33,282                    
Fair Value, ending balance 8,618 [18],[20] 33,282 [15],[29]   8,618 [18],[20]   33,282 [15],[29]                
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[33]       158                    
Fair Value, ending balance 158 [18],[34] 158 [15],[33]   158 [18],[34]   158 [15],[33]                
Investment, Identifier [Axis]: Ansira Holdings, Inc, First lien - Undrawn                            
Principal amount or par value 1,161 [18],[19],[21],[22] 1,161 [15],[16],[23],[24]   1,161 [18],[19],[21],[22]   1,161 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [18],[19],[22]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Ansira Holdings, Inc.                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance 1,993     1,993                    
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien - Drawn                            
Principal amount or par value 385 [18],[19],[21],[22] 313 [15],[16],[23],[24]   385 [18],[19],[21],[22]   313 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       313                    
Fair Value, ending balance 385 [18],[19],[22] 313 [15],[16],[24]   385 [18],[19],[22]   313 [15],[16],[24]                
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 1                            
Principal amount or par value 32,736 [18],[19],[21] 32,953 [15],[23],[28]   32,736 [18],[19],[21]   32,953 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       14,829                    
Fair Value, ending balance 1,591 [18],[19] 14,829 [15],[28]   1,591 [18],[19]   14,829 [15],[28]                
Investment, Identifier [Axis]: Ansira Holdings, Inc., First lien 2                            
Principal amount or par value 8,261 [18],[19],[21] 8,316 [15],[16],[23]   8,261 [18],[19],[21]   8,316 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       3,742                    
Fair Value, ending balance $ 402 [18],[19] $ 3,742 [15],[16]   $ 402 [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 Holdings, Inc., First lien                            
Principal amount or par value [18],[21],[27] $ 6,203     $ 6,203                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[27] 6,203     $ 6,203                    
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 2,768 [18],[19] $ 2,628 [15],[16]   2,768 [18],[19]   $ 2,628 [15],[16]                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien                            
Principal amount or par value [15],[23],[28]   6,234       6,234                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28],[35]       6,234                    
Fair Value, ending balance [15],[28],[35]   6,234       6,234                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                            
Principal amount or par value 417 [18],[19],[21],[22] 417 [15],[16],[23],[24]   417 [18],[19],[21],[22]   417 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24],[35]       0                    
Fair Value, ending balance 0 [18],[19],[22] 0 [15],[16],[24],[35]   0 [18],[19],[22]   0 [15],[16],[24],[35]                
Investment, Identifier [Axis]: Apptio, Inc., First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   1,240       1,240                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       1,240                    
Fair Value, ending balance [15],[16],[24]   1,240       1,240                
Investment, Identifier [Axis]: Apptio, Inc., First lien - Undrawn                            
Principal amount or par value [15],[16],[23],[24]   827       827                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance [15],[16],[24]   0       0                
Investment, Identifier [Axis]: Apptio, Inc., First lien 1                            
Principal amount or par value [15],[23],[28]   5,703       5,703                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       5,703                    
Fair Value, ending balance [15],[28]   5,703       5,703                
Investment, Identifier [Axis]: Apptio, Inc., First lien 2                            
Principal amount or par value [15],[23],[29]   5,500       5,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       5,500                    
Fair Value, ending balance [15],[29]   5,500       5,500                
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                            
Principal amount or par value 3,543 [18],[19],[21],[22] 3,543 [15],[16],[23],[24]   3,543 [18],[19],[21],[22]   3,543 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [18],[19],[22]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Associations, Inc., First lien 1                            
Principal amount or par value 36,468 [18],[20],[21] 35,786 [15],[23],[29]   36,468 [18],[20],[21]   35,786 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       35,786                    
Fair Value, ending balance 36,468 [18],[20] 35,786 [15],[29]   36,468 [18],[20]   35,786 [15],[29]                
Investment, Identifier [Axis]: Associations, Inc., First lien 2                            
Principal amount or par value 8,980 [18],[20],[21] 8,810 [15],[23],[28]   8,980 [18],[20],[21]   8,810 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       8,810                    
Fair Value, ending balance 8,980 [18],[20] 8,810 [15],[28]   8,980 [18],[20]   8,810 [15],[28]                
Investment, Identifier [Axis]: Associations, Inc., First lien 3                            
Principal amount or par value 8,979 [18],[21],[27] 8,810 [15],[23],[29]   8,979 [18],[21],[27]   8,810 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       8,810                    
Fair Value, ending balance 8,979 [18],[27] 8,810 [15],[29]   8,979 [18],[27]   8,810 [15],[29]                
Investment, Identifier [Axis]: Associations, Inc., First lien 4                            
Principal amount or par value 5,422 [18],[21],[27] 5,321 [15],[23],[28]   5,422 [18],[21],[27]   5,321 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       5,321                    
Fair Value, ending balance 5,422 [18],[27] 5,321 [15],[28]   5,422 [18],[27]   5,321 [15],[28]                
Investment, Identifier [Axis]: Associations, Inc., First lien 5                            
Principal amount or par value 4,313 [18],[21],[27] 4,233 [15],[23],[28]   4,313 [18],[21],[27]   4,233 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       4,233                    
Fair Value, ending balance 4,313 [18],[27] 4,233 [15],[28]   4,313 [18],[27]   4,233 [15],[28]                
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                            
Principal amount or par value 34,459 [18],[21],[27] 34,459 [15],[23],[28]   34,459 [18],[21],[27]   34,459 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28],[36]       34,356                    
Fair Value, ending balance 34,045 [18],[27],[37] 34,356 [15],[28],[36]   34,045 [18],[27],[37]   34,356 [15],[28],[36]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien                            
Principal amount or par value 3,454 [18],[20],[21] 3,454 [23],[29]   3,454 [18],[20],[21]   3,454 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [29],[36]       3,402                    
Fair Value, ending balance 3,454 [18],[20],[37] 3,402 [29],[36]   3,454 [18],[20],[37]   3,402 [29],[36]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                            
Principal amount or par value 320 [18],[19],[21],[22] 320 [16],[23],[24]   320 [18],[19],[21],[22]   320 [16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16],[24],[36]       (5)                    
Fair Value, ending balance 0 [18],[19],[22],[37] (5) [16],[24],[36]   0 [18],[19],[22],[37]   (5) [16],[24],[36]                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                            
Principal amount or par value 21,902 [18],[21],[27] 22,069 [15],[23],[28]   21,902 [18],[21],[27]   22,069 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       21,694                    
Fair Value, ending balance 21,541 [18],[27] 21,694 [15],[28]   21,541 [18],[27]   21,694 [15],[28]                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                            
Principal amount or par value 14,812 [18],[20],[21] 14,925 [15],[23],[29]   14,812 [18],[20],[21]   14,925 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       14,671                    
Fair Value, ending balance 14,568 [18],[20] 14,671 [15],[29]   14,568 [18],[20]   14,671 [15],[29]                
Investment, Identifier [Axis]: Avalara, Inc., First lien                            
Principal amount or par value [18],[21],[27] 17,198     17,198                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[27] 17,198     17,198                    
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                            
Principal amount or par value 1,720 [18],[19],[21],[22] 3,538 [15],[16],[23],[24]   1,720 [18],[19],[21],[22]   3,538 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (30)                    
Fair Value, ending balance 0 [18],[19],[22] (30) [15],[16],[24]   0 [18],[19],[22]   (30) [15],[16],[24]                
Investment, Identifier [Axis]: Avalara, Inc., First lien 1                            
Principal amount or par value [15],[23],[28]   22,500       22,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       22,307                    
Fair Value, ending balance [15],[28]   22,307       22,307                
Investment, Identifier [Axis]: Avalara, Inc., First lien 2                            
Principal amount or par value [15],[23],[29]   12,880       12,880                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       12,769                    
Fair Value, ending balance [15],[29]   12,769       $ 12,769                
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                            
Preferred equity dividend rate           12.25%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[36],[38]       10,748                    
Fair Value, ending balance 11,191 [18],[19],[37] 10,748 [15],[16],[36],[38]   11,191 [18],[19],[37]   $ 10,748 [15],[16],[36],[38]                
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   1,212       1,212                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       1,177                    
Fair Value, ending balance [15],[16],[24]   1,177       1,177                
Investment, Identifier [Axis]: Bluefin Holding, LLC, First lien - Undrawn                            
Principal amount or par value [15],[16],[23],[24]   303       303                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (9)                    
Fair Value, ending balance [15],[16],[24]   (9)       (9)                
Investment, Identifier [Axis]: Bluefin Holding, LLC, Second lien                            
Principal amount or par value [15],[23],[28]   18,000       18,000                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       17,338                    
Fair Value, ending balance [15],[28]   17,338       17,338                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 1                            
Principal amount or par value 22,500 [18],[21],[39] 22,500 [15],[23],[40]   22,500 [18],[21],[39]   22,500 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       21,798                    
Fair Value, ending balance 22,500 [18],[39] 21,798 [15],[40]   22,500 [18],[39]   21,798 [15],[40]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 2                            
Principal amount or par value 16,624 [18],[20],[21] 16,624 [15],[23],[29]   16,624 [18],[20],[21]   16,624 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       16,104                    
Fair Value, ending balance 16,624 [18],[20] 16,104 [15],[29]   16,624 [18],[20]   16,104 [15],[29]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., Second lien 3                            
Principal amount or par value 6,000 [18],[21],[27] 6,000 [15],[23],[28]   6,000 [18],[21],[27]   6,000 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       5,813                    
Fair Value, ending balance 6,000 [18],[27] 5,813 [15],[28]   6,000 [18],[27]   5,813 [15],[28]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   392       392                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       392                    
Fair Value, ending balance [15],[16],[24]   392       392                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                            
Principal amount or par value 852 [18],[19],[21],[22] 460 [15],[16],[23],[24]   852 [18],[19],[21],[22]   460 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [18],[19],[22]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                            
Principal amount or par value 16,530 [18],[20],[21] 16,659 [15],[23],[29]   16,530 [18],[20],[21]   16,659 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       16,659                    
Fair Value, ending balance 16,530 [18],[20] 16,659 [15],[29]   16,530 [18],[20]   16,659 [15],[29]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                            
Principal amount or par value 3,416 [18],[20],[21] 3,442 [15],[23],[29]   3,416 [18],[20],[21]   3,442 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       3,442                    
Fair Value, ending balance 3,416 [18],[20] 3,442 [15],[29]   3,416 [18],[20]   3,442 [15],[29]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                            
Principal amount or par value 765 [18],[20],[21] 771 [15],[23],[29]   765 [18],[20],[21]   771 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       771                    
Fair Value, ending balance 765 [18],[20] 771 [15],[29]   765 [18],[20]   771 [15],[29]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                            
Principal amount or par value 343 [18],[20],[21] 345 [15],[23],[29]   343 [18],[20],[21]   345 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       345                    
Fair Value, ending balance 343 [18],[20] 345 [15],[29]   343 [18],[20]   345 [15],[29]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                            
Principal amount or par value 273 [18],[20],[21] 275 [15],[23],[29]   273 [18],[20],[21]   275 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       275                    
Fair Value, ending balance 273 [18],[20] 275 [15],[29]   273 [18],[20]   275 [15],[29]                
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                            
Principal amount or par value 11,195 [18],[20],[21] 11,392 [15],[23],[29]   11,195 [18],[20],[21]   11,392 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       10,637                    
Fair Value, ending balance 9,912 [18],[20] 10,637 [15],[29]   9,912 [18],[20]   10,637 [15],[29]                
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                            
Principal amount or par value 3,335 [18],[20],[21] 3,393 [15],[23],[29]   3,335 [18],[20],[21]   3,393 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       3,168                    
Fair Value, ending balance 2,953 [18],[20] 3,168 [15],[29]   2,953 [18],[20]   3,168 [15],[29]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                            
Principal amount or par value 8,381 [18],[20],[21] 8,317 [15],[23],[29]   8,381 [18],[20],[21]   8,317 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       7,411                    
Fair Value, ending balance 7,940 [18],[20] 7,411 [15],[29]   7,940 [18],[20]   7,411 [15],[29]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                            
Principal amount or par value 930 [18],[19],[21],[22] 916 [15],[16],[23],[24]   930 [18],[19],[21],[22]   916 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       817                    
Fair Value, ending balance 881 [18],[19],[22] 817 [15],[16],[24]   881 [18],[19],[22]   817 [15],[16],[24]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                            
Principal amount or par value 226 [18],[19],[21],[22] 226 [15],[16],[23],[24]   226 [18],[19],[21],[22]   226 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (25)                    
Fair Value, ending balance (12) [18],[19],[22] (25) [15],[16],[24]   (12) [18],[19],[22]   (25) [15],[16],[24]                
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 1                            
Principal amount or par value 7,012 [18],[21],[25] 7,012 [15],[23],[26]   7,012 [18],[21],[25]   7,012 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       6,923                    
Fair Value, ending balance 7,012 [18],[25] 6,923 [15],[26]   7,012 [18],[25]   6,923 [15],[26]                
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 2                            
Principal amount or par value 4,453 [18],[19],[21] 4,453 [15],[16],[23]   4,453 [18],[19],[21]   4,453 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       4,396                    
Fair Value, ending balance 4,454 [18],[19] 4,396 [15],[16]   4,454 [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],[21] 18,266 [15],[16],[23]   18,266 [18],[19],[21]   18,266 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       17,409                    
Fair Value, ending balance 18,256 [18],[19] 17,409 [15],[16]   18,256 [18],[19]   17,409 [15],[16]                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 2                            
Principal amount or par value 7,500 [18],[21],[27] 7,500 [15],[23],[28]   7,500 [18],[21],[27]   7,500 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       7,148                    
Fair Value, ending balance 7,496 [18],[27] 7,148 [15],[28]   7,496 [18],[27]   7,148 [15],[28]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien                            
Principal amount or par value 12,347 [18],[21],[39] 12,347 [15],[23],[40]   12,347 [18],[21],[39]   12,347 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       12,347                    
Fair Value, ending balance 12,040 [18],[39] 12,347 [15],[40]   12,040 [18],[39]   12,347 [15],[40]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                            
Principal amount or par value 850 [18],[19],[21],[22] 850 [15],[16],[23],[24]   850 [18],[19],[21],[22]   850 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       850                    
Fair Value, ending balance 829 [18],[19],[22] 850 [15],[16],[24]   829 [18],[19],[22]   850 [15],[16],[24]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                            
Principal amount or par value 637 [18],[19],[21],[22] 637 [15],[16],[23],[24]   637 [18],[19],[21],[22]   637 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance (16) [18],[19],[22] 0 [15],[16],[24]   (16) [18],[19],[22]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                            
Principal amount or par value 11,883 [21],[25] 11,974 [15],[23],[26]   11,883 [21],[25]   11,974 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       11,490                    
Fair Value, ending balance 10,813 [25] 11,490 [15],[26]   10,813 [25]   11,490 [15],[26]                
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                            
Principal amount or par value 9,767 [18],[21],[25] 9,767 [15],[23],[26]   9,767 [18],[21],[25]   9,767 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       9,432                    
Fair Value, ending balance 8,811 [18],[25] 9,432 [15],[26]   8,811 [18],[25]   9,432 [15],[26]                
Investment, Identifier [Axis]: Castle Management Borrower LLC, First lien                            
Principal amount or par value 13,845 [18],[21],[27] 14,288 [15],[23],[28]   13,845 [18],[21],[27]   14,288 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       13,605                    
Fair Value, ending balance 13,845 [18],[27] 13,605 [15],[28]   13,845 [18],[27]   13,605 [15],[28]                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 1                            
Principal amount or par value 47,838 [19],[21] 47,838 [16],[23]   47,838 [19],[21]   47,838 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       40,941                    
Fair Value, ending balance 42,993 [19] 40,941 [16]   42,993 [19]   40,941 [16]                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second lien 2                            
Principal amount or par value 7,500 [21],[27] 7,500 [23],[28]   7,500 [21],[27]   7,500 [23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [28]       6,419                    
Fair Value, ending balance 6,740 [27] 6,419 [28]   6,740 [27]   6,419 [28]                
Investment, Identifier [Axis]: CommerceHub, Inc., First lien                            
Principal amount or par value [18],[19],[21] 3,970     3,970                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19] 3,970     3,970                    
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien                            
Principal amount or par value 7,109 [18],[20],[21] 7,163 [15],[23],[29]   7,109 [18],[20],[21]   7,163 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       6,928                    
Fair Value, ending balance 6,934 [18],[20] 6,928 [15],[29]   6,934 [18],[20]   6,928 [15],[29]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                            
Principal amount or par value 425 [18],[19],[21],[22] 425 [15],[16],[23],[24]   425 [18],[19],[21],[22]   425 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (14)                    
Fair Value, ending balance (10) [18],[19],[22] (14) [15],[16],[24]   (10) [18],[19],[22]   (14) [15],[16],[24]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                            
Principal amount or par value 849 [18],[19],[21],[22] 849 [15],[16],[23],[24]   849 [18],[19],[21],[22]   849 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (28)                    
Fair Value, ending balance (21) [18],[19],[22] (28) [15],[16],[24]   (21) [18],[19],[22]   (28) [15],[16],[24]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                            
Principal amount or par value 19,070 [18],[21],[25] 19,215 [15],[23],[26]   19,070 [18],[21],[25]   19,215 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       18,639                    
Fair Value, ending balance 16,826 [18],[25] 18,639 [15],[26]   16,826 [18],[25]   18,639 [15],[26]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                            
Principal amount or par value 3,184 [18],[21],[25] 3,208 [15],[23],[26]   3,184 [18],[21],[25]   3,208 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       3,112                    
Fair Value, ending balance 2,810 [18],[25] 3,112 [15],[26]   2,810 [18],[25]   3,112 [15],[26]                
Investment, Identifier [Axis]: Coupa Holdings, LLC First lien - Undrawn 1                            
Principal amount or par value [18],[19],[21],[22] 1,291     1,291                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 0     0                    
Investment, Identifier [Axis]: Coupa Holdings, LLC First lien - Undrawn 2                            
Principal amount or par value [18],[19],[21],[22] 989     989                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 0     0                    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 1                            
Principal amount or par value [18],[20],[21] 7,230     7,230                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 7,230     7,230                    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 2                            
Principal amount or par value [18],[21],[27] 7,230     7,230                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[27] 7,230     7,230                    
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Drawn                            
Principal amount or par value [18],[19],[21],[22] 709     709                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 709     709                    
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                            
Principal amount or par value 304 [18],[19],[21],[22] 1,013 [15],[16],[23],[24]   304 [18],[19],[21],[22]   1,013 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [18],[19],[22]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 1                            
Principal amount or par value 13,689 [18],[21],[39] 13,795 [15],[23],[40]   13,689 [18],[21],[39]   13,795 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       13,795                    
Fair Value, ending balance 13,689 [18],[39] 13,795 [15],[40]   13,689 [18],[39]   13,795 [15],[40]                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 2                            
Principal amount or par value 2,463 [18],[21],[39] 2,482 [15],[23],[40]   2,463 [18],[21],[39]   2,482 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       2,482                    
Fair Value, ending balance 2,463 [18],[39] 2,482 [15],[40]   2,463 [18],[39]   2,482 [15],[40]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien                            
Principal amount or par value [18],[20],[21] 3,261     3,261                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 3,163     3,163                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Drawn                            
Principal amount or par value 3,878 [18],[19],[21],[22] 2,836 [15],[16],[23],[24]   3,878 [18],[19],[21],[22]   2,836 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       2,781                    
Fair Value, ending balance 3,774 [18],[19],[22] 2,781 [15],[16],[24]   3,774 [18],[19],[22]   2,781 [15],[16],[24]                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 48     48                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] (1)     (1)                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 1                            
Principal amount or par value [15],[16],[23],[24]   450       450                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (9)                    
Fair Value, ending balance [15],[16],[24]   (9)       (9)                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Undrawn 2                            
Principal amount or par value [16],[23],[24]   3,936       3,936                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16],[24]       (59)                    
Fair Value, ending balance [16],[24]   (59)       (59)                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                            
Principal amount or par value [15],[23],[29]   19,660       19,660                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       19,278                    
Fair Value, ending balance [15],[29]   19,278       19,278                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                            
Principal amount or par value [15],[23],[29]   7,046       7,046                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       6,909                    
Fair Value, ending balance [15],[29]   6,909       6,909                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 3                            
Principal amount or par value [15],[16],[23]   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],[21] 20,313 [16],[23]   20,313 [19],[21]   20,313 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       18,053                    
Fair Value, ending balance 18,047 [19] 18,053 [16]   18,047 [19]   18,053 [16]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                            
Principal amount or par value [15],[23],[24],[26]   2,457       2,457                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[26]       (67)                    
Fair Value, ending balance [15],[24],[26]   (67)       (67)                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 1                            
Principal amount or par value 1,147 [18],[21],[22],[25] 2,405 [15],[16],[23],[24]   1,147 [18],[21],[22],[25]   2,405 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (66)                    
Fair Value, ending balance (18) [18],[22],[25] (66) [15],[16],[24]   (18) [18],[22],[25]   (66) [15],[16],[24]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 2                            
Principal amount or par value 2,405 [18],[19],[21],[22] 6,561 [15],[16],[23],[24]   2,405 [18],[19],[21],[22]   6,561 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (180)                    
Fair Value, ending balance (38) [18],[19],[22] (180) [15],[16],[24]   (38) [18],[19],[22]   (180) [15],[16],[24]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn 3                            
Principal amount or par value [18],[19],[21],[22] 3,062     3,062                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] (48)     (48)                    
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                            
Principal amount or par value 18,619 [18],[21],[27] 18,760 [15],[23],[28]   18,619 [18],[21],[27]   18,760 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       18,246                    
Fair Value, ending balance 18,325 [18],[27] 18,246 [15],[28]   18,325 [18],[27]   18,246 [15],[28]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                            
Principal amount or par value 6,973 [18],[21],[25] 7,025 [15],[23],[26]   6,973 [18],[21],[25]   7,025 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       6,833                    
Fair Value, ending balance 6,863 [18],[25] 6,833 [15],[26]   6,863 [18],[25]   6,833 [15],[26]                
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First lien                            
Principal amount or par value 7,491 [18],[20],[21] 7,547 [23],[29]   7,491 [18],[20],[21]   7,547 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [29]       7,434                    
Fair Value, ending balance 7,491 [18],[20] 7,434 [29]   7,491 [18],[20]   7,434 [29]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn                            
Principal amount or par value 123 [18],[19],[21],[22] 33 [15],[16],[23],[24]   123 [18],[19],[21],[22]   33 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       32                    
Fair Value, ending balance 121 [18],[19],[22] 32 [15],[16],[24]   121 [18],[19],[22]   32 [15],[16],[24]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                            
Principal amount or par value 524 [18],[19],[21],[22] 524 [15],[16],[23],[24]   524 [18],[19],[21],[22]   524 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (15)                    
Fair Value, ending balance (9) [18],[19],[22] (15) [15],[16],[24]   (9) [18],[19],[22]   (15) [15],[16],[24]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                            
Principal amount or par value 863 [18],[19],[21],[22] 953 [15],[16],[23],[24]   863 [18],[19],[21],[22]   953 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (27)                    
Fair Value, ending balance (13) [18],[19],[22] (27) [15],[16],[24]   (13) [18],[19],[22]   (27) [15],[16],[24]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                            
Principal amount or par value 13,044 [18],[21],[27] 13,144 [15],[23],[28]   13,044 [18],[21],[27]   13,144 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       12,776                    
Fair Value, ending balance 12,823 [18],[27] 12,776 [15],[28]   12,823 [18],[27]   12,776 [15],[28]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                            
Principal amount or par value 1,099 [18],[20],[21] 1,107 [15],[23],[29]   1,099 [18],[20],[21]   1,107 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       1,076                    
Fair Value, ending balance 1,080 [18],[20] 1,076 [15],[29]   1,080 [18],[20]   $ 1,076 [15],[29]                
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                            
Preferred equity dividend rate           7.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[41]       65,688                    
Fair Value, ending balance 66,739 [18],[19] 65,688 [15],[16],[41]   66,739 [18],[19]   $ 65,688 [15],[16],[41]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien                            
Principal amount or par value [15],[23],[29]   37,860       37,860                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       36,232                    
Fair Value, ending balance [15],[29]   36,232       36,232                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn                            
Principal amount or par value [18],[19],[21],[22] 2,018     2,018                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 1,957     1,957                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 1                            
Principal amount or par value [15],[16],[23],[24]   3,985       3,985                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       3,814                    
Fair Value, ending balance [15],[16],[24]   3,814       3,814                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn 2                            
Principal amount or par value [15],[16],[23],[24]   2,623       2,623                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       2,510                    
Fair Value, ending balance [15],[16],[24]   2,510       2,510                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 1,009     1,009                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] (31)     (31)                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 1                            
Principal amount or par value [15],[16],[23],[24]   404       404                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (17)                    
Fair Value, ending balance [15],[16],[24]   (17)       (17)                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn 2                            
Principal amount or par value [15],[16],[23],[24]   9,080       9,080                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (390)                    
Fair Value, ending balance [15],[16],[24]   $ (390)       $ (390)                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien 1                            
Principal amount or par value [18],[20],[21] 37,573     37,573                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 36,431     36,431                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien 2                            
Principal amount or par value [18],[19],[21] 3,955     3,955                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19] $ 3,835     $ 3,835                    
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 - Undrawn                            
Principal amount or par value [18],[19],[21],[22] $ 2,138     $ 2,138                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22],[42] $ (53)     $ (53)                    
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 $ 1,486 [18],[19],[21],[22] $ 1,087 [15],[16],[23],[24]   $ 1,486 [18],[19],[21],[22]   $ 1,087 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       1,087                    
Fair Value, ending balance 1,449 [18],[19],[22] 1,087 [15],[16],[24]   1,449 [18],[19],[22]   1,087 [15],[16],[24]                
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn                            
Principal amount or par value [15],[16],[23],[24]   2,537       2,537                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24],[43]       0                    
Fair Value, ending balance [15],[16],[24],[43]   0       0                
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                            
Principal amount or par value 17,449 [18],[20],[21] 17,583 [15],[23],[29]   17,449 [18],[20],[21]   17,583 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       17,371                    
Fair Value, ending balance 16,940 [18],[20] 17,371 [15],[29]   16,940 [18],[20]   17,371 [15],[29]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                            
Principal amount or par value 9,730 [18],[20],[21] 9,805 [15],[23],[29]   9,730 [18],[20],[21]   9,805 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       9,688                    
Fair Value, ending balance 9,446 [18],[20] 9,688 [15],[29]   9,446 [18],[20]   9,688 [15],[29]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 3                            
Principal amount or par value 5,783 [18],[19],[21] 5,827 [15],[16],[23]   5,783 [18],[19],[21]   5,827 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       5,827                    
Fair Value, ending balance 5,637 [18],[19] 5,827 [15],[16]   $ 5,637 [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],[43]       $ 11,304                    
Fair Value, ending balance 11,243 [18],[19],[42] 11,304 [15],[16],[43]   11,243 [18],[19],[42]   $ 11,304 [15],[16],[43]                
Investment, Identifier [Axis]: EAB Global, Inc., Second lien                            
Principal amount or par value 33,452 [18],[20],[21] 33,452 [15],[23],[29]   33,452 [18],[20],[21]   33,452 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       32,392                    
Fair Value, ending balance 32,870 [18],[20] 32,392 [15],[29]   32,870 [18],[20]   32,392 [15],[29]                
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                            
Principal amount or par value [18],[20],[21] 10,676     10,676                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 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],[21] 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] 4,094     4,094                    
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                            
Principal amount or par value 17,844 [18],[19],[21] 16,473 [15],[16],[23]   17,844 [18],[19],[21]   16,473 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       16,473                    
Fair Value, ending balance 17,845 [18],[19],[44] 16,473 [15],[16]   17,845 [18],[19],[44]   16,473 [15],[16]                
Investment, Identifier [Axis]: Education Management Corporation, Ordinary shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [29]       0                    
Fair Value, ending balance 0 [20] 0 [29]   0 [20]   0 [29]                
Investment, Identifier [Axis]: Education Management Corporation, Ordinary shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       0                    
Fair Value, ending balance 0 [19] 0 [16]   0 [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 [29]       0                    
Fair Value, ending balance 0 [20] 0 [29]   0 [20]   0 [29]                
Investment, Identifier [Axis]: Education Management Corporation, Preferred shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       0                    
Fair Value, ending balance 0 [19] 0 [16]   0 [19]   0 [16]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 1                            
Principal amount or par value 300 [20],[21] 300 [23],[29]   300 [20],[21]   300 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [29]       0                    
Fair Value, ending balance 0 [20] 0 [29]   0 [20]   0 [29]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 2                            
Principal amount or par value 169 [19],[21] 169 [16],[23]   169 [19],[21]   169 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       0                    
Fair Value, ending balance 0 [19] 0 [16]   0 [19]   0 [16]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 3                            
Principal amount or par value 205 [20],[21] 205 [23],[29]   205 [20],[21]   205 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [29]       0                    
Fair Value, ending balance 0 [20] 0 [29]   0 [20]   0 [29]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 4                            
Principal amount or par value 115 [19],[21] 115 [16],[23]   115 [19],[21]   115 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       0                    
Fair Value, ending balance 0 [19] 0 [16]   0 [19]   0 [16]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 5                            
Principal amount or par value 139 [20],[21] 139 [23],[29]   139 [20],[21]   139 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [29]       0                    
Fair Value, ending balance 0 [20] 0 [29]   0 [20]   0 [29]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 6                            
Principal amount or par value 79 [19],[21] 79 [16],[23]   79 [19],[21]   79 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       0                    
Fair Value, ending balance 0 [19] 0 [16]   0 [19]   0 [16]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 7                            
Principal amount or par value 4 [20],[21] 4 [23],[29]   4 [20],[21]   4 [23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [29]       0                    
Fair Value, ending balance 0 [20] 0 [29]   0 [20]   0 [29]                
Investment, Identifier [Axis]: Education Management II LLC, First lien 8                            
Principal amount or par value 2 [19],[21] 2 [16],[23]   2 [19],[21]   2 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       0                    
Fair Value, ending balance 0 [19] 0 [16]   0 [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],[23],[29]   14,582       14,582                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       $ 13,123                    
Fair Value, ending balance [15],[29]   $ 13,123       $ 13,123                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien                            
Number of investments held | investment 3 2   3   2 3 3 2 2        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 1                            
Principal amount or par value $ 4,145 [18],[19],[21],[22] $ 490 [15],[16],[23],[24]   $ 4,145 [18],[19],[21],[22]   $ 490 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       477                    
Fair Value, ending balance 4,110 [18],[19],[22] 477 [15],[16],[24]   4,110 [18],[19],[22]   477 [15],[16],[24]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 2                            
Principal amount or par value 140 [18],[19],[21],[22] 589 [15],[16],[23],[24]   140 [18],[19],[21],[22]   589 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       584                    
Fair Value, ending balance 138 [18],[19],[22] 584 [15],[16],[24]   138 [18],[19],[22]   584 [15],[16],[24]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                            
Principal amount or par value 1,597 [18],[19],[21],[22] 910 [15],[16],[23],[24]   1,597 [18],[19],[21],[22]   910 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (25)                    
Fair Value, ending balance (13) [18],[19],[22] (25) [15],[16],[24]   (13) [18],[19],[22]   (25) [15],[16],[24]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                            
Principal amount or par value 1,260 [18],[19],[21],[22] 5,165 [15],[16],[23],[24]   1,260 [18],[19],[21],[22]   5,165 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (52)                    
Fair Value, ending balance (21) [18],[19],[22] (52) [15],[16],[24]   (21) [18],[19],[22]   (52) [15],[16],[24]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                            
Principal amount or par value 10,316 [18],[21],[39] 10,395 [15],[23],[40]   10,316 [18],[21],[39]   10,395 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       10,110                    
Fair Value, ending balance 10,145 [18],[39] 10,110 [15],[40]   10,145 [18],[39]   10,110 [15],[40]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                            
Principal amount or par value 3,463 [18],[21],[39] 3,489 [15],[23],[40]   3,463 [18],[21],[39]   3,489 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       3,393                    
Fair Value, ending balance 3,405 [18],[39] 3,393 [15],[40]   3,405 [18],[39]   3,393 [15],[40]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                            
Principal amount or par value 3,441 [18],[21],[39] 3,467 [15],[23],[40]   3,441 [18],[21],[39]   3,467 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       3,372                    
Fair Value, ending balance 3,384 [18],[39] 3,372 [15],[40]   3,384 [18],[39]   3,372 [15],[40]                
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],[40],[45]       4,686                    
Fair Value, ending balance 4,233 [18],[39] 4,686 [15],[40],[45]   4,233 [18],[39]   4,686 [15],[40],[45]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Drawn                            
Principal amount or par value [18],[19],[21],[22] 545     545                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 545     545                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                            
Principal amount or par value 4,627 [18],[19],[21],[22] 2,095 [15],[16],[23],[24]   4,627 [18],[19],[21],[22]   2,095 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (21)                    
Fair Value, ending balance 0 [18],[19],[22] (21) [15],[16],[24]   0 [18],[19],[22]   (21) [15],[16],[24]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                            
Principal amount or par value 1,551 [18],[19],[21],[22] 4,907 [15],[16],[23],[24]   1,551 [18],[19],[21],[22]   4,907 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (49)                    
Fair Value, ending balance 0 [18],[19],[22] (49) [15],[16],[24]   0 [18],[19],[22]   (49) [15],[16],[24]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                            
Principal amount or par value 33,783 [18],[20],[21] 31,968 [15],[23],[29]   33,783 [18],[20],[21]   31,968 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       31,648                    
Fair Value, ending balance 33,783 [18],[20] 31,648 [15],[29]   33,783 [18],[20]   31,648 [15],[29]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                            
Principal amount or par value 278 [18],[19],[21] 2,072 [15],[16],[23]   278 [18],[19],[21]   2,072 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       2,051                    
Fair Value, ending balance 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 313 [18],[19],[21],[22] 381 [15],[16],[23],[24]   313 [18],[19],[21],[22]   381 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       372                    
Fair Value, ending balance 309 [18],[19],[22] 372 [15],[16],[24]   309 [18],[19],[22]   372 [15],[16],[24]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                            
Principal amount or par value 2,861 [18],[19],[21],[22] 81 [15],[16],[23],[24]   2,861 [18],[19],[21],[22]   81 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (2)                    
Fair Value, ending balance (31) [18],[19],[22] (2) [15],[16],[24]   (31) [18],[19],[22]   (2) [15],[16],[24]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                            
Principal amount or par value 4,573 [18],[19],[21],[22] 2,479 [15],[16],[23],[24]   4,573 [18],[19],[21],[22]   2,479 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (58)                    
Fair Value, ending balance (50) [18],[19],[22] (58) [15],[16],[24]   (50) [18],[19],[22]   (58) [15],[16],[24]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 3                            
Principal amount or par value [15],[16],[23],[24]   4,886       4,886                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (114)                    
Fair Value, ending balance [15],[16],[24]   (114)       (114)                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                            
Principal amount or par value 17,397 [18],[20],[21] 17,529 [15],[23],[29]   17,397 [18],[20],[21]   17,529 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       17,119                    
Fair Value, ending balance 17,205 [18],[20] 17,119 [15],[29]   17,205 [18],[20]   17,119 [15],[29]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                            
Principal amount or par value 10,118 [18],[21],[27] 10,195 [15],[23],[28]   10,118 [18],[21],[27]   10,195 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       9,957                    
Fair Value, ending balance 10,006 [18],[27] 9,957 [15],[28]   10,006 [18],[27]   9,957 [15],[28]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                            
Principal amount or par value 868 [18],[19],[21] 875 [15],[16],[23]   868 [18],[19],[21]   875 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       855                    
Fair Value, ending balance 859 [18],[19] 855 [15],[16]   859 [18],[19]   855 [15],[16]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 4                            
Principal amount or par value [18],[19],[21] 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],[21],[39] 22,500 [15],[23],[40]   22,500 [18],[21],[39]   22,500 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       20,810                    
Fair Value, ending balance 21,971 [18],[39] 20,810 [15],[40]   21,971 [18],[39]   20,810 [15],[40]                
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                            
Principal amount or par value 7,009 [18],[20],[21] 7,009 [15],[23],[29]   7,009 [18],[20],[21]   7,009 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       6,483                    
Fair Value, ending balance 6,844 [18],[20] 6,483 [15],[29]   6,844 [18],[20]   6,483 [15],[29]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn                            
Principal amount or par value [18],[20],[21],[22] 356     356                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20],[22] 356     356                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 1                            
Principal amount or par value [15],[23],[24],[29]   16,611       16,611                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       16,411                    
Fair Value, ending balance [15],[24],[29]   16,411       16,411                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Drawn 2                            
Principal amount or par value [15],[16],[23],[24]   988       988                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       976                    
Fair Value, ending balance [15],[16],[24]   976       976                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value 96 [18],[20],[21],[22] 757 [15],[23],[24],[29]   96 [18],[20],[21],[22]   757 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       (9)                    
Fair Value, ending balance 0 [18],[20],[22] (9) [15],[24],[29]   0 [18],[20],[22]   (9) [15],[24],[29]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn 2                            
Principal amount or par value 3,951 [18],[19],[21],[22] 2,963 [15],[16],[23],[24]   3,951 [18],[19],[21],[22]   2,963 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (36)                    
Fair Value, ending balance 0 [18],[19],[22] (36) [15],[16],[24]   0 [18],[19],[22]   (36) [15],[16],[24]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                            
Principal amount or par value 40,371 [18],[20],[21] 21,885 [15],[23],[40]   40,371 [18],[20],[21]   21,885 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       21,623                    
Fair Value, ending balance 40,371 [18],[20] 21,623 [15],[40]   40,371 [18],[20]   21,623 [15],[40]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                            
Principal amount or par value 21,720 [18],[21],[39] 13,211 [15],[23],[29]   21,720 [18],[21],[39]   13,211 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       13,052                    
Fair Value, ending balance 21,720 [18],[39] 13,052 [15],[29]   21,720 [18],[39]   13,052 [15],[29]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 3                            
Principal amount or par value [15],[23],[29]   10,551       10,551                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       10,424                    
Fair Value, ending balance [15],[29]   10,424       10,424                
Investment, Identifier [Axis]: GEDC Equity, LLC, Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19] 150     150                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                            
Principal amount or par value 3,730 [18],[19],[21],[22] 5,917 [15],[16],[23],[24]   3,730 [18],[19],[21],[22]   5,917 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (53)                    
Fair Value, ending balance 0 [18],[19],[22] (53) [15],[16],[24]   0 [18],[19],[22]   (53) [15],[16],[24]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                            
Principal amount or par value 34,112 [18],[20],[21] 67,275 [15],[23],[29]   34,112 [18],[20],[21]   67,275 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       66,675                    
Fair Value, ending balance 34,112 [18],[20] 66,675 [15],[29]   34,112 [18],[20]   66,675 [15],[29]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                            
Principal amount or par value 21,577 [18],[21],[39] 21,745 [15],[23],[40]   21,577 [18],[21],[39]   21,745 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       21,551                    
Fair Value, ending balance 21,577 [18],[39] 21,551 [15],[40]   21,577 [18],[39]   21,551 [15],[40]                
Investment, Identifier [Axis]: Granicus, Inc., First lien - Drawn                            
Principal amount or par value 1,110 [18],[19],[21],[22] 810 [15],[16],[23],[24]   1,110 [18],[19],[21],[22]   810 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       810                    
Fair Value, ending balance 1,110 [18],[19],[22] 810 [15],[16],[24]   1,110 [18],[19],[22]   810 [15],[16],[24]                
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn                            
Principal amount or par value 1,303 [18],[19],[21],[22] 1,604 [15],[16],[23],[24]   1,303 [18],[19],[21],[22]   1,604 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [18],[19],[22]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 1                            
Principal amount or par value 15,443 [18],[21],[25] 15,405 [15],[23],[26]   15,443 [18],[21],[25]   15,405 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       15,405                    
Fair Value, ending balance 15,443 [18],[25] 15,405 [15],[26]   15,443 [18],[25]   15,405 [15],[26]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 2                            
Principal amount or par value 5,974 [18],[21],[27] 5,959 [15],[23],[28]   5,974 [18],[21],[27]   5,959 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       5,959                    
Fair Value, ending balance 5,974 [18],[27] 5,959 [15],[28]   5,974 [18],[27]   5,959 [15],[28]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 3                            
Principal amount or par value 5,892 [18],[20],[21] 5,877 [15],[23],[29]   5,892 [18],[20],[21]   5,877 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       5,877                    
Fair Value, ending balance 5,892 [18],[20] 5,877 [15],[29]   5,892 [18],[20]   5,877 [15],[29]                
Investment, Identifier [Axis]: Granicus, Inc., First lien 4                            
Principal amount or par value 4,554 [18],[20],[21] 4,579 [15],[23],[29]   4,554 [18],[20],[21]   4,579 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       4,579                    
Fair Value, ending balance 4,554 [18],[20] 4,579 [15],[29]   4,554 [18],[20]   $ 4,579 [15],[29]                
Investment, Identifier [Axis]: Groundworks, LLC, First lien                            
Principal amount or par value [18],[21],[25] 18,216     18,216                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[25] 17,943     17,943                    
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 1                            
Principal amount or par value [18],[19],[21],[22] 1,076     1,076                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] (16)     (16)                    
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 2                            
Principal amount or par value [18],[21],[22],[25] 2,237     2,237                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[22],[25] (34)     (34)                    
Investment, Identifier [Axis]: HB Wealth Management, LLC, Preferred shares                            
Preferred equity dividend rate           4.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[46],[47]       5,126                    
Fair Value, ending balance 5,125 [18],[48] 5,126 [15],[46],[47]   5,125 [18],[48]   $ 5,126 [15],[46],[47]                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                            
Principal amount or par value [18],[21],[39] 22,500     22,500                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[39] 21,546     21,546                    
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                            
Principal amount or par value [18],[20],[21] 4,208     4,208                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 4,030     4,030                    
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                            
Principal amount or par value [15],[23],[40]   22,500       22,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       21,409                    
Fair Value, ending balance [15],[40]   21,409       21,409                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                            
Principal amount or par value [15],[23],[29]   4,208       4,208                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       4,004                    
Fair Value, ending balance [15],[29]   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],[49]       35,679                    
Fair Value, ending balance 2,042 [18],[50] 35,679 [15],[49]   2,042 [18],[50]   35,679 [15],[49]                
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],[51]       109                    
Fair Value, ending balance 92 [18],[52] 109 [15],[51]   92 [18],[52]   109 [15],[51]                
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                            
Principal amount or par value 8,000 [18],[19],[21],[22] 8,000 [15],[16],[23],[24]   8,000 [18],[19],[21],[22]   8,000 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24],[53]       0                    
Fair Value, ending balance 0 [18],[19],[22],[54] 0 [15],[16],[24],[53]   0 [18],[19],[22],[54]   0 [15],[16],[24],[53]                
Investment, Identifier [Axis]: IG Intermediateco LLC, First lien 1                            
Principal amount or par value [18],[20],[21] 18,755     18,755                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 18,755     18,755                    
Investment, Identifier [Axis]: IG Intermediateco LLC, First lien 2                            
Principal amount or par value [18],[21],[27] 7,864     7,864                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[27] 7,864     7,864                    
Investment, Identifier [Axis]: IG Intermediateco LLC, Subordinated                            
Principal amount or par value [18],[19],[21] 17,245     17,245                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19] 17,245     17,245                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   919       919                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       906                    
Fair Value, ending balance [15],[16],[24]   906       906                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                            
Principal amount or par value 2,298 [18],[19],[21],[22] 1,379 [15],[16],[23],[24]   2,298 [18],[19],[21],[22]   1,379 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (19)                    
Fair Value, ending balance (31) [18],[19],[22] (19) [15],[16],[24]   (31) [18],[19],[22]   (19) [15],[16],[24]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                            
Principal amount or par value 28,912 [18],[20],[21] 29,134 [15],[23],[29]   28,912 [18],[20],[21]   29,134 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       28,731                    
Fair Value, ending balance 28,528 [18],[20] 28,731 [15],[29]   28,528 [18],[20]   28,731 [15],[29]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                            
Principal amount or par value 4,225 [18],[20],[21] 4,257 [15],[23],[29]   4,225 [18],[20],[21]   4,257 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       4,198                    
Fair Value, ending balance 4,168 [18],[20] 4,198 [15],[29]   4,168 [18],[20]   4,198 [15],[29]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien                            
Principal amount or par value 12,877 [18],[20],[21] 12,974 [15],[23],[29]   12,877 [18],[20],[21]   12,974 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       12,845                    
Fair Value, ending balance 12,592 [18],[20] 12,845 [15],[29]   12,592 [18],[20]   12,845 [15],[29]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   294       294                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       291                    
Fair Value, ending balance [15],[16],[24]   291       291                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn 1                            
Principal amount or par value [18],[19],[21],[22] 832     832                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 814     814                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn 2                            
Principal amount or par value [18],[19],[21],[22] 248     248                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 242     242                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value 1,301 [18],[19],[21],[22] 1,254 [15],[16],[23],[24]   1,301 [18],[19],[21],[22]   1,254 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (13)                    
Fair Value, ending balance (29) [18],[19],[22] (13) [15],[16],[24]   (29) [18],[19],[22]   (13) [15],[16],[24]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                            
Principal amount or par value 2,261 [18],[19],[21],[22] 3,097 [15],[16],[23],[24]   2,261 [18],[19],[21],[22]   3,097 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (31)                    
Fair Value, ending balance (50) [18],[19],[22] (31) [15],[16],[24]   (50) [18],[19],[22]   (31) [15],[16],[24]                
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                            
Principal amount or par value 22,500 [18],[21],[25] 22,500 [15],[23],[26]   22,500 [18],[21],[25]   22,500 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       21,168                    
Fair Value, ending balance 22,194 [18],[25] 21,168 [15],[26]   22,194 [18],[25]   21,168 [15],[26]                
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                            
Principal amount or par value 3,000 [18],[19],[21] 3,000 [15],[16],[23]   3,000 [18],[19],[21]   3,000 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       2,822                    
Fair Value, ending balance 2,959 [18],[19] 2,822 [15],[16]   2,959 [18],[19]   2,822 [15],[16]                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   1,068       1,068                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       1,048                    
Fair Value, ending balance [15],[16],[24]   1,048       1,048                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                            
Principal amount or par value 3,827 [18],[19],[21],[22] 2,759 [15],[16],[23],[24]   3,827 [18],[19],[21],[22]   2,759 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (52)                    
Fair Value, ending balance 0 [18],[19],[22] (52) [15],[16],[24]   0 [18],[19],[22]   (52) [15],[16],[24]                
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                            
Principal amount or par value [15],[23],[29]   18,898       18,898                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       18,545                    
Fair Value, ending balance [15],[29]   18,545       18,545                
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                            
Principal amount or par value [15],[23],[28]   7,923       7,923                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       7,775                    
Fair Value, ending balance [15],[28]   7,775       7,775                
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                            
Principal amount or par value [15],[16],[23]   17,245       17,245                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       16,846                    
Fair Value, ending balance [15],[16]   16,846       16,846                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                            
Principal amount or par value 4,129 [18],[20],[21] 4,187 [15],[23],[29]   4,129 [18],[20],[21]   4,187 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       4,187                    
Fair Value, ending balance 4,129 [18],[20] 4,187 [15],[29]   4,129 [18],[20]   4,187 [15],[29]                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                            
Principal amount or par value 815 [18],[19],[21] 827 [15],[16],[23]   815 [18],[19],[21]   827 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       828                    
Fair Value, ending balance 815 [18],[19] 828 [15],[16]   815 [18],[19]   828 [15],[16]                
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                            
Principal amount or par value 13,074 [18],[19],[21] 11,510 [15],[16],[23]   13,074 [18],[19],[21]   11,510 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       8,718                    
Fair Value, ending balance 12,305 [18],[19] 8,718 [15],[16]   12,305 [18],[19]   8,718 [15],[16]                
Investment, Identifier [Axis]: Integro Parent Inc., Second lien, Non-accrual status                            
Principal amount or par value                     $ 4,576      
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 1                            
Principal amount or par value 18,750 [18],[20],[21] 18,750 [15],[23],[29]   18,750 [18],[20],[21]   18,750 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       15,938                    
Fair Value, ending balance 17,038 [18],[20] 15,938 [15],[29]   17,038 [18],[20]   15,938 [15],[29]                
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 2                            
Principal amount or par value 18,750 [18],[21],[27] 18,750 [15],[23],[28]   18,750 [18],[21],[27]   18,750 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       15,937                    
Fair Value, ending balance 17,038 [18],[27] 15,937 [15],[28]   17,038 [18],[27]   15,937 [15],[28]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                            
Principal amount or par value 826 [18],[20],[21],[22] 145 [15],[23],[24],[29]   826 [18],[20],[21],[22]   145 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       139                    
Fair Value, ending balance 826 [18],[20],[22] 139 [15],[24],[29]   826 [18],[20],[22]   139 [15],[24],[29]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                            
Principal amount or par value 337 [18],[20],[21],[22] 1,022 [15],[23],[24],[29]   337 [18],[20],[21],[22]   1,022 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       (45)                    
Fair Value, ending balance 0 [18],[20],[22] (45) [15],[24],[29]   0 [18],[20],[22]   (45) [15],[24],[29]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                            
Principal amount or par value 6,915 [18],[21],[27] 6,968 [15],[23],[28]   6,915 [18],[21],[27]   6,968 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       6,662                    
Fair Value, ending balance 6,915 [18],[27] 6,662 [15],[28]   6,915 [18],[27]   6,662 [15],[28]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                            
Principal amount or par value 792 [18],[20],[21] 801 [15],[23],[29]   792 [18],[20],[21]   801 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       766                    
Fair Value, ending balance 792 [18],[20] 766 [15],[29]   792 [18],[20]   766 [15],[29]                
Investment, Identifier [Axis]: Kaseya Inc., First lien                            
Principal amount or par value 63,229 [18],[20],[21] 63,093 [15],[23],[29]   63,229 [18],[20],[21]   63,093 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29],[55]       62,172                    
Fair Value, ending balance 63,229 [18],[20] 62,172 [15],[29],[55]   63,229 [18],[20]   62,172 [15],[29],[55]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 1                            
Principal amount or par value [18],[19],[21],[22] 969     969                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 969     969                    
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 2                            
Principal amount or par value [18],[19],[21],[22] 235     235                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 235     235                    
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                            
Principal amount or par value 2,888 [18],[19],[21],[22] 3,851 [15],[16],[23],[24]   2,888 [18],[19],[21],[22]   3,851 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (56)                    
Fair Value, ending balance 0 [18],[19],[22] (56) [15],[16],[24]   0 [18],[19],[22]   (56) [15],[16],[24]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                            
Principal amount or par value 3,616 [18],[19],[21],[22] 3,851 [15],[16],[23],[24]   3,616 [18],[19],[21],[22]   3,851 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (56)                    
Fair Value, ending balance 0 [18],[19],[22] (56) [15],[16],[24]   0 [18],[19],[22]   (56) [15],[16],[24]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien                            
Principal amount or par value 14,837 [18],[21],[39] 15,788 [15],[23],[40]   14,837 [18],[21],[39]   15,788 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       15,788                    
Fair Value, ending balance 14,837 [18],[39] 15,788 [15],[40]   14,837 [18],[39]   15,788 [15],[40]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                            
Principal amount or par value 1,799 [18],[19],[21],[22] 1,799 [15],[16],[23],[24]   1,799 [18],[19],[21],[22]   1,799 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [18],[19],[22]   0 [15],[16],[24]                
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc., Preferred shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[55]       14,661                    
Fair Value, ending balance 17,019 [18],[19],[56] 14,661 [15],[16],[55]   $ 17,019 [18],[19],[56]   $ 14,661 [15],[16],[55]                
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],[21],[27] 20,857 [23],[28]   $ 20,857 [18],[21],[27]   $ 20,857 [23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [28]       15,726                    
Fair Value, ending balance 19,585 [18],[27] 15,726 [28]   19,585 [18],[27]   15,726 [28]                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 1                            
Principal amount or par value [15],[16],[23],[24]   2,002       2,002                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (45)                    
Fair Value, ending balance [15],[16],[24]   (45)       (45)                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 2,002     2,002                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] (19)     (19)                    
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn 2                            
Principal amount or par value [15],[16],[23],[24]   4,074       4,074                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (92)                    
Fair Value, ending balance [15],[16],[24]   (92)       (92)                
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                            
Principal amount or par value 21,711 [18],[21],[39] 21,879 [15],[23],[40]   21,711 [18],[21],[39]   21,879 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       21,383                    
Fair Value, ending balance 21,502 [18],[39] 21,383 [15],[40]   21,502 [18],[39]   21,383 [15],[40]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                            
Principal amount or par value 7,690 [18],[19],[21] 4,615 [15],[23],[29]   7,690 [18],[19],[21]   4,615 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       4,511                    
Fair Value, ending balance 7,616 [18],[19] 4,511 [15],[29]   7,616 [18],[19]   4,511 [15],[29]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                            
Principal amount or par value 4,580 [18],[20],[21] 3,173 [15],[23],[29]   4,580 [18],[20],[21]   3,173 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       3,101                    
Fair Value, ending balance 4,536 [18],[20] 3,101 [15],[29]   4,536 [18],[20]   3,101 [15],[29]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                            
Principal amount or par value 3,148 [18],[20],[21] 3,664 [15],[16],[23]   3,148 [18],[20],[21]   3,664 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       3,581                    
Fair Value, ending balance 3,118 [18],[20] 3,581 [15],[16]   3,118 [18],[20]   3,581 [15],[16]                
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                            
Principal amount or par value 803 [18],[19],[21] 810 [15],[16],[23]   803 [18],[19],[21]   810 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       791                    
Fair Value, ending balance 796 [18],[19] 791 [15],[16]   796 [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],[57]       0                    
Fair Value, ending balance 0 [18],[19],[58] 0 [15],[16],[57]   0 [18],[19],[58]   0 [15],[16],[57]                
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[57]       0                    
Fair Value, ending balance 0 [18],[19],[58] 0 [15],[16],[57]   0 [18],[19],[58]   0 [15],[16],[57]                
Investment, Identifier [Axis]: NM APP Canada Corp., Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[36],[59]       0                    
Fair Value, ending balance 7 [18],[37],[60] 0 [15],[36],[59]   7 [18],[37],[60]   0 [15],[36],[59]                
Investment, Identifier [Axis]: NM APP US LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[59]       0                    
Fair Value, ending balance [15],[59]   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],[59]       16,172                    
Fair Value, ending balance 11,692 [18],[60] 16,172 [15],[59]   11,692 [18],[60]   16,172 [15],[59]                
Investment, Identifier [Axis]: NM DRVT LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[59]       0                    
Fair Value, ending balance [15],[59]   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],[59]       0                    
Fair Value, ending balance [15],[59]   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],[36],[59]       1,028                    
Fair Value, ending balance 1,041 [18],[37],[60] 1,028 [15],[36],[59]   1,041 [18],[37],[60]   1,028 [15],[36],[59]                
Investment, Identifier [Axis]: NM JRA LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[59]       0                    
Fair Value, ending balance [15],[59]   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],[59]       0                    
Fair Value, ending balance [15],[59]   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],[36],[59]       94,305                    
Fair Value, ending balance 95,892 [18],[37],[60] 94,305 [15],[36],[59]   95,892 [18],[37],[60]   94,305 [15],[36],[59]                
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[59]       9,481                    
Fair Value, ending balance 9,449 [18],[60] 9,481 [15],[59]   9,449 [18],[60]   9,481 [15],[59]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Drawn                            
Principal amount or par value 5,012 [18],[19],[21],[22] 1,635 [15],[16],[23],[24]   5,012 [18],[19],[21],[22]   1,635 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       1,624                    
Fair Value, ending balance 4,921 [18],[19],[22] 1,624 [15],[16],[24]   4,921 [18],[19],[22]   1,624 [15],[16],[24]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Undrawn                            
Principal amount or par value 889 [18],[19],[21],[22] 9,029 [15],[16],[23],[24]   889 [18],[19],[21],[22]   9,029 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (63)                    
Fair Value, ending balance (16) [18],[19],[22] (63) [15],[16],[24]   (16) [18],[19],[22]   (63) [15],[16],[24]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                            
Principal amount or par value 19,259 [18],[21],[27] 19,259 [15],[23],[28]   19,259 [18],[21],[27]   19,259 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       19,124                    
Fair Value, ending balance 18,908 [18],[27] 19,124 [15],[28]   18,908 [18],[27]   19,124 [15],[28]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                            
Principal amount or par value 4,913 [18],[20],[21] 4,913 [15],[23],[29]   4,913 [18],[20],[21]   4,913 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       4,879                    
Fair Value, ending balance 4,824 [18],[20] 4,879 [15],[29]   4,824 [18],[20]   4,879 [15],[29]                
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC, Membership interest                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[36]       140,000                    
Fair Value, ending balance 140,000 [18],[19],[37] 140,000 [15],[16],[36]   140,000 [18],[19],[37]   140,000 [15],[16],[36]                
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],[36]       112,400                    
Fair Value, ending balance 112,400 [18],[19],[37] 112,400 [15],[16],[36]   112,400 [18],[19],[37]   112,400 [15],[16],[36]                
Investment, Identifier [Axis]: National HME, Inc., Second lien                            
Principal amount or par value [18],[19],[21] 8,281     8,281                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19] 3,000     3,000                    
Other Income   (1,500)                        
Investment, Identifier [Axis]: National HME, Inc., Second lien 1                            
Principal amount or par value [15],[16],[23]   13,013       13,013                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       5,381                    
Fair Value, ending balance [15],[16]   5,381       5,381                
Investment, Identifier [Axis]: National HME, Inc., Second lien 2                            
Principal amount or par value [15],[16],[23]   14,500       14,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       0                    
Fair Value, ending balance [15],[16]   0       0                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                            
Principal amount or par value 40,208 [18],[20],[21] 35,541 [15],[23],[29]   40,208 [18],[20],[21]   35,541 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       35,541                    
Fair Value, ending balance 40,208 [18],[20] 35,541 [15],[29]   40,208 [18],[20]   35,541 [15],[29]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                            
Principal amount or par value 12,392 [18],[19],[21] 8,720 [15],[23],[28]   12,392 [18],[19],[21]   8,720 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       8,720                    
Fair Value, ending balance 12,392 [18],[19] 8,720 [15],[28]   12,392 [18],[19]   8,720 [15],[28]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                            
Principal amount or par value 9,865 [18],[21],[27] 4,282 [15],[16],[23]   9,865 [18],[21],[27]   4,282 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       4,282                    
Fair Value, ending balance 9,865 [18],[27] 4,282 [15],[16]   9,865 [18],[27]   4,282 [15],[16]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                            
Principal amount or par value 20,458 [18],[19],[21] 18,687 [15],[16],[23]   20,458 [18],[19],[21]   18,687 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       14,950                    
Fair Value, ending balance 16,366 [18],[19] 14,950 [15],[16]   16,366 [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],[29]       34,490                    
Fair Value, ending balance 34,490 [18],[20] 34,490 [15],[29]   34,490 [18],[20]   34,490 [15],[29]                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       8,462                    
Fair Value, ending balance 8,462 [18],[27] 8,462 [15],[28]   8,462 [18],[27]   8,462 [15],[28]                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 3                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       7,701                    
Fair Value, ending balance 7,701 [18],[19] 7,701 [15],[16]   7,701 [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],[21] 21,779 [15],[16],[23]   23,336 [18],[19],[21]   21,779 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       21,779                    
Fair Value, ending balance 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 12,599 [18],[19],[21],[22] 9,785 [15],[16],[23],[24]   12,599 [18],[19],[21],[22]   9,785 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       9,785                    
Fair Value, ending balance 12,599 [18],[19],[22] 9,785 [15],[16],[24]   12,599 [18],[19],[22]   9,785 [15],[16],[24]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                            
Principal amount or par value 9,295 [18],[19],[21],[22] 1,577 [15],[16],[23],[24]   9,295 [18],[19],[21],[22]   1,577 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       0                    
Fair Value, ending balance 0 [18],[19],[22] 0 [15],[16],[24]   0 [18],[19],[22]   0 [15],[16],[24]                
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien                            
Principal amount or par value 26,762 [18],[20],[21] 26,762 [15],[23],[29]   26,762 [18],[20],[21]   26,762 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       20,101                    
Fair Value, ending balance 14,192 [18],[20] 20,101 [15],[29]   14,192 [18],[20]   20,101 [15],[29]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 1                            
Principal amount or par value 869 [18],[19],[21],[22] 876 [15],[16],[23],[24]   869 [18],[19],[21],[22]   876 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       861                    
Fair Value, ending balance 801 [18],[19],[22] 861 [15],[16],[24]   801 [18],[19],[22]   861 [15],[16],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 2                            
Principal amount or par value 59 [18],[19],[21],[22] 147 [15],[16],[23],[24]   59 [18],[19],[21],[22]   147 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       145                    
Fair Value, ending balance 54 [18],[19],[22] 145 [15],[16],[24]   54 [18],[19],[22]   145 [15],[16],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 1                            
Principal amount or par value 587 [18],[19],[21],[22] 587 [15],[16],[23],[24]   587 [18],[19],[21],[22]   587 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (10)                    
Fair Value, ending balance (46) [18],[19],[22] (10) [15],[16],[24]   (46) [18],[19],[22]   (10) [15],[16],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn 2                            
Principal amount or par value 822 [18],[19],[21],[22] 734 [15],[16],[23],[24]   822 [18],[19],[21],[22]   734 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (12)                    
Fair Value, ending balance (64) [18],[19],[22] (12) [15],[16],[24]   (64) [18],[19],[22]   (12) [15],[16],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                            
Principal amount or par value 9,975 [18],[21],[27] 10,051 [15],[23],[28]   9,975 [18],[21],[27]   10,051 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       9,882                    
Fair Value, ending balance 9,192 [18],[27] 9,882 [15],[28]   9,192 [18],[27]   9,882 [15],[28]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                            
Principal amount or par value 9,850 [18],[21],[27] 9,925 [15],[23],[28]   9,850 [18],[21],[27]   9,925 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       9,758                    
Fair Value, ending balance $ 9,077 [18],[27] 9,758 [15],[28]   $ 9,077 [18],[27]   9,758 [15],[28]                
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],[21],[22] 3,600 [15],[16],[23],[24]   $ 3,600 [18],[19],[21],[22]   3,600 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24],[61]       (29)                    
Fair Value, ending balance 0 [18],[19],[22],[62] (29) [15],[16],[24],[61]   0 [18],[19],[22],[62]   (29) [15],[16],[24],[61]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                            
Principal amount or par value 27,778 [18],[20],[21] 27,989 [15],[23],[29]   27,778 [18],[20],[21]   27,989 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       27,763                    
Fair Value, ending balance 27,778 [18],[20] 27,763 [15],[29]   27,778 [18],[20]   27,763 [15],[29]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                            
Principal amount or par value 1,758 [18],[20],[21] 1,772 [15],[23],[29]   1,758 [18],[20],[21]   1,772 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       1,757                    
Fair Value, ending balance 1,758 [18],[20] 1,757 [15],[29]   1,758 [18],[20]   1,757 [15],[29]                
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[61]       2,000                    
Fair Value, ending balance 2,879 [18],[19],[62] 2,000 [15],[16],[61]   $ 2,879 [18],[19],[62]   $ 2,000 [15],[16],[61]                
Investment, Identifier [Axis]: OEC Holdco, LLC, Preferred shares                            
Preferred equity dividend rate       11.00%   11.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[63],[64]       $ 7,214                    
Fair Value, ending balance $ 7,936 [18],[65],[66] $ 7,214 [15],[63],[64]   $ 7,936 [18],[65],[66]   $ 7,214 [15],[63],[64]                
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],[20],[21] $ 23,406 [15],[23],[29]   $ 23,406 [18],[20],[21]   $ 23,406 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       22,687                    
Fair Value, ending balance 23,406 [18],[20] 22,687 [15],[29]   23,406 [18],[20]   22,687 [15],[29]                
Investment, Identifier [Axis]: OEConnection LLC, Second lien 2                            
Principal amount or par value 12,044 [18],[20],[21] 12,044 [15],[23],[29]   12,044 [18],[20],[21]   12,044 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       11,674                    
Fair Value, ending balance 12,044 [18],[20] 11,674 [15],[29]   12,044 [18],[20]   11,674 [15],[29]                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 1,860     1,860                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 0     0                    
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 1                            
Principal amount or par value [18],[21],[27] 7,440     7,440                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[27] 7,440     7,440                    
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 2                            
Principal amount or par value [18],[20],[21] 7,440     7,440                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 7,440     7,440                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien                            
Principal amount or par value 7,514 [18],[21],[25] 6,629 [15],[23],[26]   7,514 [18],[21],[25]   6,629 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       6,500                    
Fair Value, ending balance 7,514 [18],[25] 6,500 [15],[26]   7,514 [18],[25]   6,500 [15],[26]                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   131       131                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       129                    
Fair Value, ending balance [15],[16],[24]   129       129                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 486     486                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 0     0                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 1                            
Principal amount or par value [15],[16],[23],[24]   355       355                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (7)                    
Fair Value, ending balance [15],[16],[24]   (7)       (7)                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn 2                            
Principal amount or par value [15],[23],[24],[26]   885       885                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[26]       (17)                    
Fair Value, ending balance [15],[24],[26]   (17)       (17)                
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                            
Principal amount or par value 14,500 [18],[19],[21] 14,500 [15],[16],[23]   14,500 [18],[19],[21]   14,500 [15],[16],[23]               $ 20,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       7,995                    
Fair Value, ending balance 7,975 [18],[19] 7,995 [15],[16]   7,975 [18],[19]   7,995 [15],[16]                
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                            
Principal amount or par value 0 [21],[67],[68] 0 [23],[69],[70]   0 [21],[67],[68]   0 [23],[69],[70]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [69],[70]       0                    
Fair Value, ending balance 0 [67],[68] 0 [69],[70]   0 [67],[68]   0 [69],[70]                
Investment, Identifier [Axis]: Permian Trust, First lien 1                            
Principal amount or par value 247 [18],[21],[71] 247 [15],[23],[72]   247 [18],[21],[71]   247 [15],[23],[72]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[72]       0                    
Fair Value, ending balance 0 [18],[71] 0 [15],[72]   0 [18],[71]   0 [15],[72]                
Investment, Identifier [Axis]: Permian Trust, First lien 2                            
Principal amount or par value 3,409 [18],[19],[21] 3,409 [15],[16],[23]   3,409 [18],[19],[21]   3,409 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       0                    
Fair Value, ending balance 0 [18],[19] 0 [15],[16]   0 [18],[19]   0 [15],[16]                
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 1                            
Principal amount or par value 48,941 [18],[20],[21] 49,270 [15],[23],[29]   48,941 [18],[20],[21]   49,270 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       49,270                    
Fair Value, ending balance 48,941 [18],[20] 49,270 [15],[29]   48,941 [18],[20]   49,270 [15],[29]                
Investment, Identifier [Axis]: PhyNet Dermatology LLC, First lien 2                            
Principal amount or par value 18,514 [18],[20],[21] 18,726 [15],[23],[29]   18,514 [18],[20],[21]   18,726 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       18,726                    
Fair Value, ending balance $ 18,514 [18],[20] 18,726 [15],[29]   $ 18,514 [18],[20]   18,726 [15],[29]                
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],[21],[22] 2,446 [15],[16],[23],[24]   $ 2,446 [18],[19],[21],[22]   2,446 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24],[73]       (32)                    
Fair Value, ending balance (48) [18],[19],[22],[74] (32) [15],[16],[24],[73]   (48) [18],[19],[22],[74]   (32) [15],[16],[24],[73]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                            
Principal amount or par value 16,292 [18],[21],[27] 14,900 [15],[23],[28]   16,292 [18],[21],[27]   14,900 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       14,706                    
Fair Value, ending balance 16,292 [18],[27] 14,706 [15],[28]   16,292 [18],[27]   14,706 [15],[28]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                            
Principal amount or par value 2,233 [18],[21],[27] 2,042 [15],[23],[28]   2,233 [18],[21],[27]   2,042 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       2,016                    
Fair Value, ending balance 2,233 [18],[27] 2,016 [15],[28]   2,233 [18],[27]   2,016 [15],[28]                
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Ordinary shares                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[73],[75]       1,631                    
Fair Value, ending balance 1,813 [18],[74],[76] 1,631 [15],[73],[75]   1,813 [18],[74],[76]   $ 1,631 [15],[73],[75]                
Investment, Identifier [Axis]: Project Essential Super Parent, Inc., Preferred shares                            
Preferred equity variable rate margin           9.50%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[77]       11,569                    
Fair Value, ending balance 12,504 [18],[19] 11,569 [15],[16],[77]   12,504 [18],[19]   $ 11,569 [15],[16],[77]                
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien                            
Principal amount or par value [18],[20],[21] 3,562     3,562                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 3,562     3,562                    
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 184     184                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 0     0                    
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien                            
Principal amount or par value 5,122 [18],[20],[21] 5,161 [15],[23],[29]   5,122 [18],[20],[21]   5,161 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       5,014                    
Fair Value, ending balance 5,096 [18],[20] 5,014 [15],[29]   5,096 [18],[20]   5,014 [15],[29]                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   422       422                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       410                    
Fair Value, ending balance [15],[16],[24]   410       410                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                            
Principal amount or par value 1,161 [18],[19],[21],[22] 483 [15],[16],[23],[24]   1,161 [18],[19],[21],[22]   483 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (14)                    
Fair Value, ending balance (6) [18],[19],[22] (14) [15],[16],[24]   (6) [18],[19],[22]   (14) [15],[16],[24]                
Investment, Identifier [Axis]: Quartz Holding Company, Second lien                            
Principal amount or par value 10,000 [18],[19],[21] 10,000 [15],[16],[23]   10,000 [18],[19],[21]   10,000 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       9,802                    
Fair Value, ending balance 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],[21],[22] 2,981 [15],[16],[23],[24]   2,981 [18],[19],[21],[22]   2,981 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (25)                    
Fair Value, ending balance 0 [18],[19],[22] (25) [15],[16],[24]   0 [18],[19],[22]   (25) [15],[16],[24]                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 1                            
Principal amount or par value 24,282 [18],[21],[27] 24,469 [15],[23],[28]   24,282 [18],[21],[27]   24,469 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       24,263                    
Fair Value, ending balance 24,282 [18],[27] 24,263 [15],[28]   24,282 [18],[27]   24,263 [15],[28]                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 2                            
Principal amount or par value 12,556 [18],[20],[21] 12,652 [15],[23],[29]   12,556 [18],[20],[21]   12,652 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       12,546                    
Fair Value, ending balance 12,556 [18],[20] 12,546 [15],[29]   12,556 [18],[20]   12,546 [15],[29]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien                            
Principal amount or par value 6,922 [18],[20],[21] 6,975 [15],[23],[29]   6,922 [18],[20],[21]   6,975 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       6,861                    
Fair Value, ending balance 6,922 [18],[20] 6,861 [15],[29]   6,922 [18],[20]   6,861 [15],[29]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                            
Principal amount or par value [18],[19],[21],[22] 256     256                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 256     256                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                            
Principal amount or par value 256 [18],[19],[21],[22] 512 [15],[16],[23],[24]   256 [18],[19],[21],[22]   512 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (8)                    
Fair Value, ending balance 0 [18],[19],[22] (8) [15],[16],[24]   0 [18],[19],[22]   (8) [15],[16],[24]                
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien                            
Principal amount or par value [18],[19],[21] 7,272     7,272                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19] 6,740     6,740                    
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       3,599                    
Fair Value, ending balance 1,799 [18],[20] 3,599 [15],[29]   1,799 [18],[20]   3,599 [15],[29]                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       401                    
Fair Value, ending balance 201 [18],[19] 401 [15],[16]   201 [18],[19]   401 [15],[16]                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Second lien                            
Principal amount or par value [15],[16],[23]   5       5                
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]: Specialtycare, Inc., First lien                            
Principal amount or par value [15],[23],[29]   10,458       10,458                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       10,019                    
Fair Value, ending balance [15],[29]   10,019       10,019                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 1                            
Principal amount or par value [15],[16],[23],[24]   212       212                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       204                    
Fair Value, ending balance [15],[16],[24]   204       204                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn 2                            
Principal amount or par value [15],[16],[23],[24]   79       79                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       75                    
Fair Value, ending balance [15],[16],[24]   75       75                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 559     559                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] (19)     (19)                    
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 1                            
Principal amount or par value [15],[16],[23],[24]   347       347                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (15)                    
Fair Value, ending balance [15],[16],[24]   (15)       (15)                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn 2                            
Principal amount or par value [15],[16],[23],[24]   868       868                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (36)                    
Fair Value, ending balance [15],[16],[24]   (36)       (36)                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 1                            
Principal amount or par value [18],[20],[21] 10,379     10,379                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 10,032     10,032                    
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 2                            
Principal amount or par value [18],[19],[21] 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 21,959 [20],[21] 21,959 [15],[23],[29]   21,959 [20],[21]   21,959 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       21,324                    
Fair Value, ending balance 21,962 [20] 21,324 [15],[29]   21,962 [20]   21,324 [15],[29]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien                            
Principal amount or par value [15],[23],[29]   3,985       3,985                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       3,917                    
Fair Value, ending balance [15],[29]   3,917       3,917                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn                            
Principal amount or par value [15],[23],[24],[29]   2,791       2,791                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       2,744                    
Fair Value, ending balance [15],[24],[29]   2,744       2,744                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 559     559                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] (12)     (12)                    
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 1                            
Principal amount or par value [15],[16],[23],[24]   559       559                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (9)                    
Fair Value, ending balance [15],[16],[24]   (9)       (9)                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn 2                            
Principal amount or par value [15],[23],[24],[29]   152       152                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       (3)                    
Fair Value, ending balance [15],[24],[29]   (3)       $ (3)                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien 1                            
Principal amount or par value [18],[20],[21] 3,955     3,955                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 3,868     3,868                    
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien 2                            
Principal amount or par value [18],[20],[21] 2,795     2,795                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[20] 2,732     2,732                    
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares                            
Preferred equity variable rate margin           10.50%                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       11,396                    
Fair Value, ending balance 12,802 [18],[25] 11,396 [15],[26]   12,802 [18],[25]   $ 11,396 [15],[26]                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       3,929                    
Fair Value, ending balance 4,413 [18],[19] 3,929 [15],[16]   4,413 [18],[19]   3,929 [15],[16]                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                            
Principal amount or par value 22,500 [18],[21],[25] 22,500 [15],[23],[26]   22,500 [18],[21],[25]   22,500 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       21,067                    
Fair Value, ending balance 21,652 [18],[25] 21,067 [15],[26]   21,652 [18],[25]   21,067 [15],[26]                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                            
Principal amount or par value 5,697 [18],[20],[21] 5,697 [15],[23],[29]   5,697 [18],[20],[21]   5,697 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       5,334                    
Fair Value, ending balance 5,482 [18],[20] 5,334 [15],[29]   5,482 [18],[20]   5,334 [15],[29]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                            
Principal amount or par value 16,269 [18],[20],[21] 16,395 [15],[23],[29]   16,269 [18],[20],[21]   16,395 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       10,657                    
Fair Value, ending balance 11,777 [18],[20] 10,657 [15],[29]   11,777 [18],[20]   10,657 [15],[29]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                            
Principal amount or par value 15,691 [18],[21],[27] 15,813 [15],[23],[28]   15,691 [18],[21],[27]   15,813 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       10,277                    
Fair Value, ending balance 11,359 [18],[27] 10,277 [15],[28]   11,359 [18],[27]   10,277 [15],[28]                
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC), Second lien                            
Principal amount or par value 7,950 [18],[20],[21] 7,950 [15],[23],[29]   7,950 [18],[20],[21]   7,950 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       7,488                    
Fair Value, ending balance 7,672 [18],[20] 7,488 [15],[29]   $ 7,672 [18],[20]   $ 7,488 [15],[29]                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                            
Ordinary shares dividend rate       12.00%   12.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       $ 110,314                    
Fair Value, ending balance 100,918 [18],[19],[44] 110,314 [15],[16]   100,918 [18],[19],[44]   $ 110,314 [15],[16]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien - Undrawn                            
Principal amount or par value 4,439 [18],[19],[21],[22] 4,439 [15],[16],[23],[24]   4,439 [18],[19],[21],[22]   4,439 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24],[36]       (71)                    
Fair Value, ending balance 0 [18],[19],[22],[37] (71) [15],[16],[24],[36]   0 [18],[19],[22],[37]   (71) [15],[16],[24],[36]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 1                            
Principal amount or par value 35,000 [18],[20],[21] 35,000 [15],[23],[29]   35,000 [18],[20],[21]   35,000 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       34,436                    
Fair Value, ending balance 35,000 [18],[20] 34,436 [15],[29]   35,000 [18],[20]   34,436 [15],[29]                
Investment, Identifier [Axis]: Tahoe Finco, LLC, First lien 2                            
Principal amount or par value 24,189 [18],[21],[27] 24,189 [15],[23],[28]   24,189 [18],[21],[27]   24,189 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       23,800                    
Fair Value, ending balance 24,189 [18],[27] 23,800 [15],[28]   24,189 [18],[27]   23,800 [15],[28]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien - Drawn 1                            
Principal amount or par value   13,941       13,941                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                            
Principal amount or par value 15,906 15,562   15,906   15,562 £ 13,039 [18],[19],[21],[78]   £ 12,879 [15],[16],[23],[79]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[79]       15,562                    
Fair Value, ending balance 15,906 [18],[19],[78] 15,562 [15],[16],[79]   15,906 [18],[19],[78]   15,562 [15],[16],[79]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                            
Principal amount or par value | £             £ 10,669 [18],[19],[21],[78]   £ 10,538 [15],[16],[23],[79]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[79]       12,734                    
Fair Value, ending balance 13,017 [18],[19],[78] 12,734 [15],[16],[79]   13,017 [18],[19],[78]   12,734 [15],[16],[79]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2 and Tennessee Bidco Limited, First lien 5                            
Principal amount or par value 13,774     13,774                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                            
Principal amount or par value 10,312 [18],[19],[21] 10,184 [15],[16],[23]   10,312 [18],[19],[21]   10,184 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       10,184                    
Fair Value, ending balance 10,312 [18],[19] 10,184 [15],[16]   10,312 [18],[19]   10,184 [15],[16]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                            
Principal amount or par value 6,326 [18],[19],[21] 6,246 [15],[16],[23]   6,326 [18],[19],[21]   6,246 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       6,246                    
Fair Value, ending balance 6,326 [18],[19] 6,246 [15],[16]   6,326 [18],[19]   6,246 [15],[16]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                            
Principal amount or par value | €               € 716 [18],[19],[21],[78]   € 708 [15],[16],[23],[79]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[79]       757                    
Fair Value, ending balance 757 [18],[19],[78] 757 [15],[16],[79]   757 [18],[19],[78]   757 [15],[16],[79]                
Investment, Identifier [Axis]: The Kleinfelder Group, Inc., First lien                            
Principal amount or par value [15],[23],[26]   16,533       16,533                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       16,241                    
Fair Value, ending balance [15],[26]   16,241       16,241                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                            
Principal amount or par value 29,868 [18],[21],[27] 29,868 [15],[23],[28]   29,868 [18],[21],[27]   29,868 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       29,151                    
Fair Value, ending balance 29,408 [18],[27] 29,151 [15],[28]   29,408 [18],[27]   29,151 [15],[28]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                            
Principal amount or par value 1,087 [18],[20],[21],[22] 277 [15],[23],[24],[29]   1,087 [18],[20],[21],[22]   277 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       270                    
Fair Value, ending balance 1,071 [18],[20],[22] 270 [15],[24],[29]   1,071 [18],[20],[22]   270 [15],[24],[29]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                            
Principal amount or par value 1,152 [18],[20],[21],[22] 955 [15],[23],[24],[29]   1,152 [18],[20],[21],[22]   955 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       (23)                    
Fair Value, ending balance (18) [18],[20],[22] (23) [15],[24],[29]   (18) [18],[20],[22]   (23) [15],[24],[29]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                            
Principal amount or par value 4,267 [18],[19],[21],[22] 4,267 [15],[16],[23],[24]   4,267 [18],[19],[21],[22]   4,267 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (102)                    
Fair Value, ending balance (66) [18],[19],[22] (102) [15],[16],[24]   (66) [18],[19],[22]   (102) [15],[16],[24]                
Investment, Identifier [Axis]: Transcendia Holdings, Inc., Second lien                            
Principal amount or par value 14,500 [18],[21],[27] 14,500 [15],[23],[28]   14,500 [18],[21],[27]   14,500 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       12,418                    
Fair Value, ending balance 10,436 [18],[27] 12,418 [15],[28]   10,436 [18],[27]   12,418 [15],[28]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien                            
Principal amount or par value 15,382 [18],[20],[21] 15,382 [15],[23],[29]   15,382 [18],[20],[21]   15,382 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       15,257                    
Fair Value, ending balance 15,382 [18],[20] 15,257 [15],[29]   15,382 [18],[20]   15,257 [15],[29]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                            
Principal amount or par value 3,095 [18],[20],[21],[22] 2,889 [15],[23],[24],[29]   3,095 [18],[20],[21],[22]   2,889 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       2,865                    
Fair Value, ending balance 3,095 [18],[20],[22] 2,865 [15],[24],[29]   3,095 [18],[20],[22]   2,865 [15],[24],[29]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                            
Principal amount or par value 2,157 [18],[20],[21],[22] 1,501 [15],[16],[23],[24]   2,157 [18],[20],[21],[22]   1,501 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (12)                    
Fair Value, ending balance 0 [18],[20],[22] (12) [15],[16],[24]   0 [18],[20],[22]   (12) [15],[16],[24]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                            
Principal amount or par value 1,501 [18],[19],[21],[22] 2,364 [15],[23],[24],[29]   1,501 [18],[19],[21],[22]   2,364 [15],[23],[24],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[29]       (19)                    
Fair Value, ending balance 0 [18],[19],[22] (19) [15],[24],[29]   0 [18],[19],[22]   (19) [15],[24],[29]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                            
Principal amount or par value 893 [18],[19],[21],[22] 893 [15],[16],[23],[24]   893 [18],[19],[21],[22]   893 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (29)                    
Fair Value, ending balance 0 [18],[19],[22] (29) [15],[16],[24]   0 [18],[19],[22]   (29) [15],[16],[24]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                            
Principal amount or par value 11,226 [18],[20],[21] 11,311 [15],[23],[29]   11,226 [18],[20],[21]   11,311 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       10,945                    
Fair Value, ending balance 11,226 [18],[20] 10,945 [15],[29]   11,226 [18],[20]   10,945 [15],[29]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                            
Principal amount or par value 1,462 [18],[19],[21] 1,473 [15],[16],[23]   1,462 [18],[19],[21]   1,473 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       1,425                    
Fair Value, ending balance 1,462 [18],[19] 1,425 [15],[16]   1,462 [18],[19]   1,425 [15],[16]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 1                            
Principal amount or par value [15],[23],[29]   22,367       22,367                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       22,367                    
Fair Value, ending balance [15],[29]   22,367       22,367                
Investment, Identifier [Axis]: UniTek Global Services, Inc., First lien 2                            
Principal amount or par value [15],[23],[29]   3,949       3,949                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       3,949                    
Fair Value, ending balance [15],[29]   3,949       3,949                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Junior preferred shares, Non-accrual status                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance 0     0                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 1                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       0                    
Fair Value, ending balance 0 [18],[20] 0 [15],[29]   0 [18],[20]   0 [15],[29]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 2                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       0                    
Fair Value, ending balance 0 [18],[19] 0 [15],[16]   0 [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],[80]       11,626                    
Fair Value, ending balance 14,964 [18],[19] 11,626 [15],[16],[80]   14,964 [18],[19]   $ 11,626 [15],[16],[80]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1 and UniTek Global Services, Inc., Preferred shares 2                            
Preferred equity dividend rate           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],[80]       7,670                    
Fair Value, ending balance 9,341 [18],[19] 7,670 [15],[16],[80]   9,341 [18],[19]   $ 7,670 [15],[16],[80]                
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],[69],[81]       6,491                    
Fair Value, ending balance 5,927 [18],[19],[67] 6,491 [15],[16],[69],[81]   5,927 [18],[19],[67]   $ 6,491 [15],[16],[69],[81]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4                            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29],[69],[82]       0                    
Fair Value, ending balance 0 [18],[20],[67] 0 [15],[29],[69],[82]   0 [18],[20],[67]   $ 0 [15],[29],[69],[82]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4 and UniTek Global Services, Inc., Preferred shares 5                            
Preferred equity dividend rate           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],[69],[82]       0                    
Fair Value, ending balance 0 [18],[19],[67] 0 [15],[16],[69],[82]   0 [18],[19],[67]   $ 0 [15],[16],[69],[82]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                            
Principal amount or par value 12,942 [18],[19],[21] 11,575 [15],[16],[23]   12,942 [18],[19],[21]   11,575 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       10,384                    
Fair Value, ending balance 12,210 [18],[19] 10,384 [15],[16]   12,210 [18],[19]   10,384 [15],[16]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                            
Principal amount or par value 5,737 [18],[19],[21] 5,131 [15],[16],[23]   5,737 [18],[19],[21]   5,131 [15],[16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16]       4,603                    
Fair Value, ending balance 5,411 [18],[19] 4,603 [15],[16]   5,411 [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 5,927     5,927                    
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 42,909 [18],[19] 36,680 [15],[16]   42,909 [18],[19]   36,680 [15],[16]                
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 1                            
Principal amount or par value [15],[23],[29]   16,183       16,183                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       15,711                    
Fair Value, ending balance [15],[29]   15,711       15,711                
Investment, Identifier [Axis]: VT Topco, Inc., Second lien 2                            
Principal amount or par value [15],[23],[26]   10,000       10,000                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       9,708                    
Fair Value, ending balance [15],[26]   9,708       9,708                
Investment, Identifier [Axis]: Vectra Co., Second lien                            
Principal amount or par value 10,788 [21],[27] 10,788 [15],[23],[28]   10,788 [21],[27]   10,788 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       7,004                    
Fair Value, ending balance 10,788 [27] 7,004 [15],[28]   10,788 [27]   7,004 [15],[28]                
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                            
Principal amount or par value 7,000 [19],[21] 5,000 [16],[23]   7,000 [19],[21]   5,000 [16],[23]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [16]       3,817                    
Fair Value, ending balance 5,661 [19] 3,817 [16]   5,661 [19]   3,817 [16]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn                            
Principal amount or par value 11,135 [18],[20],[21],[22] 7,478 [15],[16],[23],[24]   11,135 [18],[20],[21],[22]   7,478 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       7,430                    
Fair Value, ending balance 11,135 [18],[20],[22] 7,430 [15],[16],[24]   11,135 [18],[20],[22]   7,430 [15],[16],[24]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                            
Principal amount or par value 2,040 [18],[19],[21],[22] 2,040 [15],[16],[23],[24]   2,040 [18],[19],[21],[22]   2,040 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (13)                    
Fair Value, ending balance 0 [18],[19],[22] (13) [15],[16],[24]   0 [18],[19],[22]   (13) [15],[16],[24]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                            
Principal amount or par value 4,624 [18],[20],[21],[22] 8,327 [15],[16],[23],[24]   4,624 [18],[20],[21],[22]   8,327 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (53)                    
Fair Value, ending balance 0 [18],[20],[22] (53) [15],[16],[24]   0 [18],[20],[22]   (53) [15],[16],[24]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                            
Principal amount or par value 18,806 [18],[20],[21] 18,949 [15],[23],[29]   18,806 [18],[20],[21]   18,949 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       18,827                    
Fair Value, ending balance 18,806 [18],[20] 18,827 [15],[29]   18,806 [18],[20]   18,827 [15],[29]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                            
Principal amount or par value 1,244 [18],[20],[21] 1,254 [15],[23],[29]   1,244 [18],[20],[21]   1,254 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       1,246                    
Fair Value, ending balance 1,245 [18],[20] 1,246 [15],[29]   1,245 [18],[20]   1,246 [15],[29]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                            
Principal amount or par value 834 [18],[20],[21] 841 [15],[23],[29]   834 [18],[20],[21]   841 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       835                    
Fair Value, ending balance 834 [18],[20] 835 [15],[29]   834 [18],[20]   835 [15],[29]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subordinated                            
Principal amount or par value [18],[19],[21] 3,333     3,333                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19] 3,283     3,283                    
Investment, Identifier [Axis]: Xactly Corporation, First lien                            
Principal amount or par value 22,500 [18],[21],[25] 19,047 [15],[23],[26]   22,500 [18],[21],[25]   19,047 [15],[23],[26]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[26]       19,047                    
Fair Value, ending balance 22,500 [18],[25] 19,047 [15],[26]   22,500 [18],[25]   19,047 [15],[26]                
Investment, Identifier [Axis]: Xactly Corporation, First lien - Drawn                            
Principal amount or par value [15],[16],[23],[24]   992       992                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       992                    
Fair Value, ending balance [15],[16],[24]   992       992                
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                            
Principal amount or par value [18],[19],[21],[22] 992     992                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] 0     0                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn                            
Principal amount or par value 1,203 [18],[21],[22],[39] 495 [15],[23],[24],[40]   1,203 [18],[21],[22],[39]   495 [15],[23],[24],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[40]       482                    
Fair Value, ending balance 1,191 [18],[22],[39] 482 [15],[24],[40]   1,191 [18],[22],[39]   482 [15],[24],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn                            
Principal amount or par value [15],[23],[24],[40]   1,584       1,584                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[40]       (41)                    
Fair Value, ending balance [15],[24],[40]   (41)       (41)                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                            
Principal amount or par value [18],[21],[22],[39] 4     4                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[22],[39] 0     0                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                            
Principal amount or par value [18],[21],[22],[39] 865     865                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[22],[39] (8)     (8)                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 3                            
Principal amount or par value [18],[19],[21],[22] 3,968     3,968                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [18],[19],[22] (38)     (38)                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 1                            
Principal amount or par value 17,723 [18],[21],[39] 17,861 [15],[23],[40]   17,723 [18],[21],[39]   17,861 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       17,393                    
Fair Value, ending balance 17,552 [18],[39] 17,393 [15],[40]   17,552 [18],[39]   17,393 [15],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 2                            
Principal amount or par value 2,308 [18],[21],[39] 2,326 [15],[23],[40]   2,308 [18],[21],[39]   2,326 [15],[23],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[40]       2,265                    
Fair Value, ending balance 2,285 [18],[39] 2,265 [15],[40]   2,285 [18],[39]   2,265 [15],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien) - Undrawn                            
Principal amount or par value [15],[16],[23],[24]   3,968       3,968                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (104)                    
Fair Value, ending balance [15],[16],[24]   (104)       (104)                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Drawn                            
Principal amount or par value [19],[21],[22] 471     471                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [19],[22] 466     466                    
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                            
Principal amount or par value 1,080 [20],[21],[22] 11,763 [15],[23],[24],[28]   1,080 [20],[21],[22]   11,763 [15],[23],[24],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[24],[28]       0                    
Fair Value, ending balance 0 [20],[22] 0 [15],[24],[28]   0 [20],[22]   0 [15],[24],[28]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                            
Principal amount or par value 6,969 [21],[22],[27] 4,218 [15],[16],[23],[24]   6,969 [21],[22],[27]   4,218 [15],[16],[23],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[16],[24]       (37)                    
Fair Value, ending balance 0 [22],[27] (37) [15],[16],[24]   0 [22],[27]   (37) [15],[16],[24]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 3                            
Principal amount or par value [19],[21],[22] 2,347     2,347                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [19],[22] (23)     (23)                    
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                            
Principal amount or par value 30,481 [21],[27] 44,287 [15],[23],[28]   30,481 [21],[27]   44,287 [15],[23],[28]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[28]       43,901                    
Fair Value, ending balance 30,176 [27] 43,901 [15],[28]   30,176 [27]   43,901 [15],[28]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                            
Principal amount or par value 7,366 [20],[21] 7,366 [15],[23],[29]   7,366 [20],[21]   7,366 [15],[23],[29]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, beginning balance [15],[29]       7,311                    
Fair Value, ending balance 7,292 [20] $ 7,311 [15],[29]   7,292 [20]   $ 7,311 [15],[29]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien 3                            
Principal amount or par value [20],[21] 4,725     4,725                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                            
Fair Value, ending balance [20] $ 4,678     $ 4,678                    
[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 September 30, 2023 and December 31, 2022 along with transactions during the nine months ended September 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 September 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 $(459)$(10)$15,112 $— $717 $— $— 
Permian Holdco 3, Inc. / Permian Trust— — — — — — — — — 
Sierra Hamilton Holdings Corporation4,000 2 (7)(1,995)2,000 — 1 — 1 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC126,787 4,801 — (12,825)118,763 — 2,228 3,417 188 
Total Non-Controlled/Affiliated Investments$130,787 $20,384 $(466)$(14,830)$135,875 $— $2,946 $3,417 $189 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind ("PIK") interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[9] Denotes investments in which the Company is in “Control”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of December 31, 2022 and December 31, 2021 along with transactions during the year ended December 31, 2022 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2021Gross
Additions
(A)		Gross
Redemptions
(B)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2022Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Edmentum Inc.$— $— $— $— $— $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 September 30, 2023 and December 31, 2022, along with transactions during the nine months ended September 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 September 30, 2023Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC $35,788 $— $— $(33,654)$2,134 $33,815 $— $— $1,530 
National HME, Inc./NHME Holdings Corp.5,381 — (17,404)15,023 3,000 (17,404)— — — 
New Benevis Topco, LLC / New Benevis Holdco, Inc.114,146 16,118 — (780)129,484 — 8,474 — 1,125 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.57,564 4,371 — — 61,935 — 3,946 — 381 
NM APP Canada Corp.— — — 7 7 — — — — 
NM CLFX LP16,172 — (259)(4,221)11,692 — — 1,082 — 
NM NL Holdings, L.P.94,305 — — 1,587 95,892 — — 6,318 — 
NM GP Holdco, LLC1,028 — — 13 1,041 — — 65 — 
NM YI LLC9,481 — — (32)9,449 — — 635 — 
NMFC Senior Loan Program III LLC140,000 — — — 140,000 — — 14,700 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 11,381 — 
UniTek Global Services, Inc.103,770 6,558 (26,449)6,883 90,762 2 3,283 3,877 907 
Total Controlled Investments$690,035 $27,047 $(44,112)$(15,174)$657,796 $16,413 $15,703 $38,058 $3,943 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[15] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[16] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[17] The Company holds ordinary shares in AAC Lender Holdings, LLC and a first lien term loan, first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[18] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[19] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[20] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[21] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[22] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[23] Par amount is denominated in United States Dollar unless otherwise noted, British Pound ("£") and/or Euro ("€").
[24] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[25] Investment is held in New Mountain Finance SBIC, L.P.
[26] Investment is held in New Mountain Finance SBIC, L.P.
[27] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C. as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[28] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[29] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[30] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, a first lien delayed draw and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum.
[31] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, a first lien delayed draw and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum.
[32] The Company holds ordinary shares in AAC Lender Holdings, LLC and 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.
[33] Investment is held in NMF Ancora Holdings, Inc.
[34] Investment is held in NMF Ancora Holdings, Inc.
[35] The Company holds investments in two wholly-owned subsidiaries of Appriss Health Holdings, Inc. The company holds a first lien term loan and a first lien revolver in Appriss Health, LLC, and preferred equity in Appriss Health Intermediate Holdings, Inc. The preferred equity is entitled to receive preferential dividends at a rate of 11.00% per annum.
[36] 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.
[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 September 30, 2023, 15.9% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[38] 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.
[39] Investment is held in New Mountain Finance SBIC II, L.P.
[40] Investment is held in New Mountain Finance SBIC II, L.P.
[41] 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.
[42] 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.
[43] 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.
[44] The Company holds ordinary shares in TVG-Edmentum Holdings, LLC, and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC. The ordinary shares are entitled to receive cumulative preferential dividends at a rate of 12.0% per annum.
[45] 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.
[46] Investment is held in NMF HB, Inc.
[47] 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.
[48] Investment is held in NMF HB, Inc.
[49] Investment is held in NMF TRM, LLC.
[50] Investment is held in NMF TRM, LLC.
[51] Investment is held in NMF QID NGL Holdings, Inc.
[52] Investment is held in NMF QID NGL Holdings, Inc.
[53] 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.
[54] 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.
[55] 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.
[56] The Company holds preferred equity in Knockout Intermediate Holdings I Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Kaseya, Inc., a wholly-owned subsidiary of Knockout Intermediate Holdings I Inc. The preferred equity is entitled to received cumulative preferential dividends at a rate of 11.75% per annum.
[57] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a Tranche A Term Loan and Tranche B Term Loan in National HME, Inc., a whollyowned subsidiary of NHME Holdings Corp.
[58] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp.
[59] Investment is held in New Mountain Net Lease Corporation.
[60] Investment is held in New Mountain Net Lease Corporation.
[61] The Company holds ordinary shares in OA Topco, L.P., and a first lien term loan and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[62] 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.
[63] Investment is held in NMF OEC, Inc.
[64] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC. The preferred equity is entitled to receive prefenential dividends of 11.00% per annum.
[65] Investment is held in NMF OEC, Inc.
[66] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC. The preferred equity is entitled to receive preferential dividends of 11.0% per annum.
[67] Investment is on non-accrual status. See Note 3. Investments, for details.
[68] 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 September 30, 2023. See Note 2. Summary of Significant Accounting Policies, for details.
[69] Investment or a portion of the investment is on non-accrual status. See Note 3. Investments, for details.
[70] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,539 as of December 31, 2022. See Note 2. Summary of Significant Accounting Policies, for details.
[71] Investment is held in NMF Permian Holdings, LLC.
[72] Investment is held in NMF Permian Holdings, LLC.
[73] The Company holds ordinary shares in Pioneer Topco I, L.P., and a first lien term loan and a first lien revolver in Pioneer Buyer I, LLC, a wholly-owned subsidiary of Pioneer Topco I, L.P.
[74] 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.
[75] Investment is held in NMF Pioneer, Inc.
[76] Investment is held in NMF Pioneer, Inc.
[77] 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.
[78] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of September 30, 2023, the par value U.S. dollar equivalent of the first lien term loan and drawn first lien term loan is $15,906 and $13,774, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[79] 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.
[80] 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.
[81] 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.
[82] 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.