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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
numberOfAgreement
investment
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
numberOfAgreement
investment
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
numberOfAgreement
investment
Jun. 30, 2024
EUR (€)
numberOfAgreement
investment
Jun. 30, 2024
GBP (£)
numberOfAgreement
investment
Dec. 31, 2023
EUR (€)
numberOfAgreement
investment
Dec. 31, 2023
GBP (£)
numberOfAgreement
investment
Sep. 30, 2023
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | numberOfAgreement 1   1   1 1 1 1 1        
Cost basis of securities purchased under collateralized agreements to resell $ 30,000   $ 30,000   $ 30,000                
Fair value of securities purchased under collateralized agreements to resell 13,500   13,500   16,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [1]     3,011,322                    
Net Change In Unrealized Appreciation (Depreciation) 30,641 $ (7,284) 33,635 $ (1,406)                  
Fair value, ending balance 3,213,780 [2]   3,213,780 [2]   $ 3,011,322 [1]                
Net Realized Gains (Losses) $ (31,166) 2,567 $ (42,993) 3,244                  
Investments at fair value that are non-qualifying assets as a percentage of total assets 14.30%   14.30%   14.80% 14.30% 14.30% 14.80% 14.80%        
QID NGL, LLC | Common Class B                          
Ownership percentage     4.60%   4.60%                
QID TRH Holdings, LLC | Common Class B                          
Ownership percentage     97.00%   97.00%                
NMFC Senior Loan Program III LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Dividend Income $ 5,775 5,338 $ 11,638 9,800                  
NMFC Senior Loan Program IV LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Dividend Income 4,004 4,145 8,360 7,728                  
Non-controlled/Affiliated                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     133,659 130,787 $ 130,787                
Gross additions     11,235 [3]   22,390 [4]                
Gross redemptions     0 [5]   (466) [6]                
Net Change In Unrealized Appreciation (Depreciation)     (26,543)   (19,052)                
Fair value, ending balance 118,351   118,351   133,659                
Net Realized Gains (Losses)     0   0                
Interest Income     2,453   4,134                
Dividend Income     2,618   4,625                
Other Income 62 63 125 126 251                
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     17,873 0 0                
Gross additions     0 [3]   15,581 [4]                
Gross redemptions     0 [5]   (459) [6]                
Net Change In Unrealized Appreciation (Depreciation)     1,332   2,751                
Fair value, ending balance 19,205   19,205   17,873                
Net Realized Gains (Losses)     0   0                
Interest Income     722   1,084                
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     2,000 4,000 4,000                
Gross additions     0 [3]   2 [4]                
Gross redemptions     0 [5]   (7) [6]                
Net Change In Unrealized Appreciation (Depreciation)     0   (1,995)                
Fair value, ending balance 2,000   2,000   2,000                
Net Realized Gains (Losses)     0   0                
Interest Income     0   2                
Dividend Income     0   0                
Other Income     0   1                
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     113,786 126,787 126,787                
Gross additions     11,235 [3]   6,807 [4]                
Gross redemptions     0 [5]   0 [6]                
Net Change In Unrealized Appreciation (Depreciation)     (27,875)   (19,808)                
Fair value, ending balance 97,146   97,146   113,786                
Net Realized Gains (Losses)     0   0                
Interest Income     1,731   3,048                
Dividend Income     2,618   4,625                
Other Income     125   250                
Controlled                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     667,796 690,035 690,035                
Gross additions     12,220 [7]   40,458 [8]                
Gross redemptions     0 [9]   (44,109) [10]                
Net Change In Unrealized Appreciation (Depreciation)     4,017   (18,588)                
Fair value, ending balance 684,033   684,033   667,796                
Net Realized Gains (Losses)     3,831   16,413                
Interest Income     10,600   20,829                
Dividend Income     28,089   51,208                
Other Income 497 $ 1,375 1,370 2,570 5,315                
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     3,419 35,788 35,788                
Gross additions     0 [7]   0 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     (2,750)   (32,369)                
Fair value, ending balance 669   669   3,419                
Net Realized Gains (Losses)     3,800   33,815                
Interest Income     0   0                
Dividend Income     0   0                
Other Income     20   2,041                
Controlled | National HME, Inc./NHME Holdings Corp.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     3,000 5,381 5,381                
Gross additions     0 [7]   0 [8]                
Gross redemptions     0 [9]   (17,404) [10]                
Net Change In Unrealized Appreciation (Depreciation)     0   15,023                
Fair value, ending balance 3,000   3,000   3,000                
Net Realized Gains (Losses)     0   (17,404)                
Interest Income     0   0                
Dividend Income     0   0                
Other Income     0   0                
Controlled | New Benevis Topco, LLC / New Benevis Holdco, Inc.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     135,401 114,146 114,146                
Gross additions     3,454 [7]   26,153 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     (5,413)   (4,898)                
Fair value, ending balance 133,442   133,442   135,401                
Net Realized Gains (Losses)     0   0                
Interest Income     6,493   11,632                
Dividend Income     0   0                
Other Income     375   1,500                
Controlled | New Permian Holdco, Inc. / New Permian Holdco, L.L.C.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     63,170 57,564 57,564                
Gross additions     4,201 [7]   5,606 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     2,000   0                
Fair value, ending balance 69,371   69,371   63,170                
Net Realized Gains (Losses)     0   0                
Interest Income     2,608   5,197                
Dividend Income     0   0                
Other Income     250   506                
Controlled | NM APP CANADA CORP                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     7 0 0                
Gross additions     0 [7]   0 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     (7)   7                
Fair value, ending balance 0   0   7                
Net Realized Gains (Losses)     31   0                
Interest Income     0   0                
Dividend Income     0   0                
Other Income     0   0                
Controlled | NM CLFX LP                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     11,731 16,172 16,172                
Gross additions     0 [7]   0 [8]                
Gross redemptions     0 [9]   (259) [10]                
Net Change In Unrealized Appreciation (Depreciation)     (1,187)   (4,182)                
Fair value, ending balance 10,544   10,544   11,731                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     401   1,252                
Other Income     0   0                
Controlled | NM NL Holdings, L.P.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     96,071 94,305 94,305                
Gross additions     0 [7]   0 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     6,103   1,766                
Fair value, ending balance 102,174   102,174   96,071                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     4,144   8,191                
Other Income     0   0                
Controlled | NM GP Holdco, LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     1,048 1,028 1,028                
Gross additions     0 [7]   0 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     67   20                
Fair value, ending balance 1,115   1,115   1,048                
Net Realized Gains (Losses)     0   0                
Interest Income       0                
Dividend Income     45   88                
Other Income     0   0                
Controlled | NM YI LLC                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     9,550 9,481 9,481                
Gross additions     0 [7]   0 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     204   69                
Fair value, ending balance 9,754   9,754   9,550                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     436   853                
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 [7]   0 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     0   0                
Fair value, ending balance 140,000   140,000   140,000                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     11,637   20,038                
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 [7]   0 [8]                
Gross redemptions     0 [9]   0 [10]                
Net Change In Unrealized Appreciation (Depreciation)     0   0                
Fair value, ending balance 112,400   112,400   112,400                
Net Realized Gains (Losses)     0   0                
Interest Income     0   0                
Dividend Income     8,360   15,483                
Other Income     0   0                
Controlled | UniTek Global Services, Inc.                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     91,999 $ 103,770 103,770                
Gross additions     4,565 [7]   8,699 [8]                
Gross redemptions     0 [9]   (26,446) [10]                
Net Change In Unrealized Appreciation (Depreciation)     5,000   5,976                
Fair value, ending balance 101,564   101,564   91,999                
Net Realized Gains (Losses)     0   2                
Interest Income     1,499   4,000                
Dividend Income     3,066   5,303                
Other Income     725   1,268                
Investment, Identifier [Axis]: AAC Lender Holdings, LLC, Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [11],[12],[13]     0                    
Fair value, ending balance 0 [14],[15],[16]   0 [14],[15],[16]   0 [11],[12],[13]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 1                          
Principal Amount or Par Value [12],[17],[18],[19]         $ 22,965                
Spread [12],[18],[19]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     22,965                    
Fair value, ending balance [12],[18],[19]         $ 22,965                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 2                          
Principal Amount or Par Value [12],[17],[18],[20]         $ 7,450                
Spread [12],[18],[20]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[20]     7,450                    
Fair value, ending balance [12],[18],[20]         $ 7,450                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                          
Principal Amount or Par Value 3,659 [15],[16],[21],[22]   3,659 [15],[16],[21],[22]   3,659 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                          
Principal Amount or Par Value $ 22,849 [15],[21],[23]   $ 22,849 [15],[21],[23]   $ 20,426 [12],[17],[24]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.50% [12],[24] 5.50% [15],[23] 5.50% [15],[23] 5.50% [12],[24] 5.50% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 20,426                    
Fair value, ending balance $ 22,849 [15],[23]   22,849 [15],[23]   $ 20,426 [12],[24]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                          
Principal Amount or Par Value $ 20,322 [15],[21],[25]   $ 20,322 [15],[21],[25]   $ 9,698 [12],[17],[20]                
Spread 5.50% [15],[25]   5.50% [15],[25]   5.50% [12],[20] 5.50% [15],[25] 5.50% [15],[25] 5.50% [12],[20] 5.50% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 9,698                    
Fair value, ending balance $ 20,321 [15],[25]   20,321 [15],[25]   $ 9,698 [12],[20]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 3                          
Principal Amount or Par Value [15],[21],[26] $ 9,649   $ 9,649                    
Spread [15],[26] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[26] $ 9,648   $ 9,648                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 4                          
Principal Amount or Par Value [15],[21],[26] $ 7,413   $ 7,413                    
Spread [15],[26] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[26] $ 7,413   $ 7,413                    
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                          
Principal Amount or Par Value 14,838 [15],[16],[21]   14,838 [15],[16],[21]   14,011 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     13,420                    
Fair value, ending balance 14,405 [15],[16]   14,405 [15],[16]   13,420 [12],[13]                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                          
Principal Amount or Par Value 5,819 [15],[21],[26]   5,819 [15],[21],[26]   5,495 [12],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     5,263                    
Fair value, ending balance 5,649 [15],[26]   5,649 [15],[26]   5,263 [12],[20]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 1                          
Principal Amount or Par Value $ 2,323 [15],[16],[21],[22]   $ 2,323 [15],[16],[21],[22]   $ 1,397 [12],[13],[17],[18]                
Spread 5.50% [15],[16],[22]   5.50% [15],[16],[22]   5.50% [12],[13],[18] 5.50% [15],[16],[22] 5.50% [15],[16],[22] 5.50% [12],[13],[18] 5.50% [12],[13],[18]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 1,364                    
Fair value, ending balance $ 2,267 [15],[16],[22]   2,267 [15],[16],[22]   $ 1,364 [12],[13],[18]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 2                          
Principal Amount or Par Value $ 588 [15],[16],[21],[22]   $ 588 [15],[16],[21],[22]   $ 353 [12],[13],[17],[18]                
Spread 5.50% [15],[16],[22]   5.50% [15],[16],[22]   5.50% [12],[13],[18] 5.50% [15],[16],[22] 5.50% [15],[16],[22] 5.50% [12],[13],[18] 5.50% [12],[13],[18]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 345                    
Fair value, ending balance $ 574 [15],[16],[22]   574 [15],[16],[22]   $ 345 [12],[13],[18]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value 1,765 [15],[16],[21],[22]   1,765 [15],[16],[21],[22]   2,001 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (48)                    
Fair value, ending balance (42) [15],[16],[22]   (42) [15],[16],[22]   (48) [12],[13],[18]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value 1,973 [15],[16],[21],[22]   1,973 [15],[16],[21],[22]   2,909 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (70)                    
Fair value, ending balance (47) [15],[16],[22]   (47) [15],[16],[22]   (70) [12],[13],[18]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 1                          
Principal Amount or Par Value $ 21,913 [15],[21],[23]   $ 21,913 [15],[21],[23]   $ 22,025 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.50% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 21,498                    
Fair value, ending balance $ 21,387 [15],[23]   21,387 [15],[23]   $ 21,498 [12],[19]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 2                          
Principal Amount or Par Value $ 3,884 [15],[16],[21]   $ 3,884 [15],[16],[21]   $ 3,904 [12],[13],[17]                
Spread 5.50% [15],[16]   5.50% [15],[16]   5.50% [12],[13] 5.50% [15],[16] 5.50% [15],[16] 5.50% [12],[13] 5.50% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 3,810                    
Fair value, ending balance $ 3,791 [15],[16]   3,791 [15],[16]   $ 3,810 [12],[13]                
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[27] 15,639   15,639                    
Preferred equity dividend rate         11.75%                
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[28]     15,040                    
Fair value, ending balance [12],[13],[28]         $ 15,040                
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., First lien                          
Principal Amount or Par Value [15],[21],[25] $ 3,062   $ 3,062                    
Spread [15],[25] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 3,062   $ 3,062                    
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 3,077   3,077                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 1,048   1,048                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 667   667                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Adelaide Borrower, LLC., First lien                          
Principal Amount or Par Value [15],[21],[25],[29] $ 4,657   $ 4,657                    
Spread [15],[25],[29],[30] 3.38%   3.38%     3.38% 3.38%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25],[29] $ 4,657   $ 4,657                    
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                          
Principal Amount or Par Value $ 6,939 [15],[21],[25]   $ 6,939 [15],[21],[25]   $ 13,444 [12],[17],[24]                
Spread 8.25% [15],[25]   8.25% [15],[25]   8.25% [12],[24] 8.25% [15],[25] 8.25% [15],[25] 8.25% [12],[24] 8.25% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 13,444                    
Fair value, ending balance $ 6,939 [15],[25]   6,939 [15],[25]   $ 13,444 [12],[24]                
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] 1,300   1,300                    
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] 1,348   1,348                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 700                
Spread [12],[13],[18]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     700                    
Fair value, ending balance [12],[13],[18]         $ 700                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                          
Principal Amount or Par Value 1,969 [15],[16],[21],[22]   1,969 [15],[16],[21],[22]   1,969 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                          
Principal Amount or Par Value $ 19,062 [15],[21],[23]   $ 19,062 [15],[21],[23]   $ 19,159 [12],[17],[19]                
Spread 5.25% [15],[23]   5.25% [15],[23]   5.50% [12],[19] 5.25% [15],[23] 5.25% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 19,159                    
Fair value, ending balance $ 19,062 [15],[23]   19,062 [15],[23]   $ 19,159 [12],[19]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                          
Principal Amount or Par Value $ 5,304 [15],[21],[23]   $ 5,304 [15],[21],[23]   $ 5,331 [12],[17],[19]                
Spread 5.25% [15],[23]   5.25% [15],[23]   5.50% [12],[19] 5.25% [15],[23] 5.25% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 5,331                    
Fair value, ending balance $ 5,304 [15],[23]   5,304 [15],[23]   $ 5,331 [12],[19]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 3                          
Principal Amount or Par Value [15],[16],[21] $ 697   $ 697                    
Spread [15],[16] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 697   $ 697                    
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 [11],[12],[13],[17],[18]         2,652                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [11],[12],[13],[18]     $ 0                    
Fair value, ending balance [11],[12],[13],[18]         0                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                          
Principal Amount or Par Value $ 29,879 [15],[21],[23]   $ 29,879 [15],[21],[23]   $ 29,879 [12],[17],[19]                
Spread 5.75% [15],[23],[30],[31]   5.75% [15],[23],[30],[31]   0.50% [12],[19],[32],[33] 5.75% [15],[23],[30],[31] 5.75% [15],[23],[30],[31] 0.50% [12],[19],[32],[33] 0.50% [12],[19],[32],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 20,586                    
Fair value, ending balance $ 20,000 [15],[23]   20,000 [15],[23]   $ 20,586 [12],[19]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                          
Principal Amount or Par Value $ 1,527 [15],[16],[21]   $ 1,527 [15],[16],[21]   $ 1,527 [12],[13],[17]                
Spread 13.50% [15],[16],[30],[31]   13.50% [15],[16],[30],[31]   0.50% [12],[13],[32],[33] 13.50% [15],[16],[30],[31] 13.50% [15],[16],[30],[31] 0.50% [12],[13],[32],[33] 0.50% [12],[13],[32],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 0                    
Fair value, ending balance $ 0 [15],[16]   0 [15],[16]   $ 0 [12],[13]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                          
Principal Amount or Par Value                   $ 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 20,000   20,000                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                          
Principal Amount or Par Value 5,230 [15],[16],[21]   5,230 [15],[16],[21]   5,230 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     0                    
Fair value, ending balance 0 [15],[16]   0 [15],[16]   0 [12],[13]                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated, Non-accrual status                          
Principal Amount or Par Value                       $ 5,230  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.)., First lien - Undrawn                          
Principal Amount or Par Value [14],[15],[16],[21],[22] 2,652   2,652                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [14],[15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Anaplan, Inc., First lien                          
Principal Amount or Par Value $ 10,618 [15],[21],[25]   $ 10,618 [15],[21],[25]   $ 10,618 [12],[17],[19]                
Spread 5.75% [15],[25]   5.75% [15],[25]   6.50% [12],[19] 5.75% [15],[25] 5.75% [15],[25] 6.50% [12],[19] 6.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 10,618                    
Fair value, ending balance $ 10,618 [15],[25]   10,618 [15],[25]   $ 10,618 [12],[19]                
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[34]     0                    
Fair value, ending balance 0 [15],[35]   0 [15],[35]   $ 0 [12],[34]                
Investment, Identifier [Axis]: Appriss Health Holdings, Inc, Wholly-owned subsidiaries                          
Number of investments held | investment         2     2 2        
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc., Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Preferred equity dividend rate         11.00%                
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc., Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     2,863                    
Fair value, ending balance [12],[13]         $ 2,863                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien                          
Principal Amount or Par Value [12],[17],[24],[36]         $ 6,188                
Spread [12],[24],[36]         6.75%     6.75% 6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24],[36]     6,188                    
Fair value, ending balance [12],[24],[36]         $ 6,188                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18],[36]         417                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18],[36]     0                    
Fair value, ending balance [12],[13],[18],[36]         0                
Investment, Identifier [Axis]: Associations, Inc., Subordinated 1                          
Principal Amount or Par Value [15],[16],[21] 7,404   7,404                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 7,386   7,386                    
Investment, Identifier [Axis]: Associations, Inc., Subordinated 2                          
Principal Amount or Par Value [15],[16],[21] 2,827   2,827                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 2,820   2,820                    
Investment, Identifier [Axis]: Associations, Inc., First lien                          
Principal Amount or Par Value [15],[21],[25] $ 49,679   $ 49,679                    
Spread [15],[25] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 49,655   $ 49,655                    
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 1,252                
Spread [12],[13],[18]         6.50%     6.50% 6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     1,252                    
Fair value, ending balance [12],[13],[18]         $ 1,252                
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         2,291                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 3,840   3,840                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (2)   (2)                    
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 3,077   3,077                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (2)   (2)                    
Investment, Identifier [Axis]: Associations, Inc., First lien 1                          
Principal Amount or Par Value [12],[17],[19]         $ 33,701                
Spread [12],[19],[33]         4.00%     4.00% 4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     33,701                    
Fair value, ending balance [12],[19]         $ 33,701                
Investment, Identifier [Axis]: Associations, Inc., First lien 2                          
Principal Amount or Par Value [12],[17],[19]         $ 9,037                
Spread [12],[19],[33]         4.00%     4.00% 4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     9,037                    
Fair value, ending balance [12],[19]         $ 9,037                
Investment, Identifier [Axis]: Associations, Inc., First lien 3                          
Principal Amount or Par Value [12],[17],[24]         $ 9,036                
Spread [12],[24],[33]         4.00%     4.00% 4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     9,036                    
Fair value, ending balance [12],[24]         $ 9,036                
Investment, Identifier [Axis]: Associations, Inc., First lien 4                          
Principal Amount or Par Value [12],[17],[24]         $ 5,457                
Spread [12],[24],[33]         4.00%     4.00% 4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     5,457                    
Fair value, ending balance [12],[24]         $ 5,457                
Investment, Identifier [Axis]: Associations, Inc., First lien 5                          
Principal Amount or Par Value [12],[17],[24]         $ 4,341                
Spread [12],[24],[33]         4.00%     4.00% 4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     4,341                    
Fair value, ending balance [12],[24]         $ 4,341                
Investment, Identifier [Axis]: Associations, Inc., First lien 6                          
Principal Amount or Par Value [12],[17],[19]         $ 4,121                
Spread [12],[19],[33]         4.00%     4.00% 4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     4,121                    
Fair value, ending balance [12],[19]         $ 4,121                
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                          
Principal Amount or Par Value $ 34,459 [15],[21],[25],[29]   $ 34,459 [15],[21],[25],[29]   $ 34,459 [12],[17],[24],[37]                
Spread 8.25% [15],[25],[29]   8.25% [15],[25],[29]   8.25% [12],[24],[37] 8.25% [15],[25],[29] 8.25% [15],[25],[29] 8.25% [12],[24],[37] 8.25% [12],[24],[37]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24],[37]     $ 34,458                    
Fair value, ending balance $ 34,459 [15],[25],[29]   34,459 [15],[25],[29]   $ 34,458 [12],[24],[37]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                          
Principal Amount or Par Value 320 [15],[16],[21],[22],[29]   320 [15],[16],[21],[22],[29]   320 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22],[29]   0 [15],[16],[22],[29]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 1                          
Principal Amount or Par Value $ 3,454 [15],[21],[25]   $ 3,454 [15],[21],[25]   $ 3,454 [12],[17],[19]                
Spread 5.75% [15],[25]   5.75% [15],[25]   7.25% [12],[19] 5.75% [15],[25] 5.75% [15],[25] 7.25% [12],[19] 7.25% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 3,454                    
Fair value, ending balance $ 3,454 [15],[25]   3,454 [15],[25]   $ 3,454 [12],[19]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 2                          
Principal Amount or Par Value $ 1,345 [15],[21],[25]   $ 1,345 [15],[21],[25]   $ 1,345 [17],[19]                
Spread 5.75% [15],[25]   5.75% [15],[25]   6.75% [19] 5.75% [15],[25] 5.75% [15],[25] 6.75% [19] 6.75% [19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19]     $ 1,332                    
Fair value, ending balance $ 1,345 [15],[25]   1,345 [15],[25]   $ 1,332 [19]                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                          
Principal Amount or Par Value $ 21,735 [15],[21],[25]   $ 21,735 [15],[21],[25]   $ 21,847 [12],[17],[24]                
Spread 5.75% [15],[25]   5.75% [15],[25]   5.75% [12],[24] 5.75% [15],[25] 5.75% [15],[25] 5.75% [12],[24] 5.75% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 21,473                    
Fair value, ending balance $ 21,222 [15],[25]   21,222 [15],[25]   $ 21,473 [12],[24]                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                          
Principal Amount or Par Value $ 14,699 [15],[21],[23]   $ 14,699 [15],[21],[23]   $ 14,774 [12],[17],[19]                
Spread 5.75% [15],[23]   5.75% [15],[23]   5.75% [12],[19] 5.75% [15],[23] 5.75% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 14,522                    
Fair value, ending balance $ 14,352 [15],[23]   14,352 [15],[23]   $ 14,522 [12],[19]                
Investment, Identifier [Axis]: Avalara, Inc., First lien                          
Principal Amount or Par Value $ 17,198 [15],[21],[25]   $ 17,198 [15],[21],[25]   $ 17,198 [12],[17],[24]                
Spread 6.75% [15],[25]   6.75% [15],[25]   7.25% [12],[24] 6.75% [15],[25] 6.75% [15],[25] 7.25% [12],[24] 7.25% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 17,198                    
Fair value, ending balance $ 17,198 [15],[25]   17,198 [15],[25]   $ 17,198 [12],[24]                
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         1,720                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 1,720   1,720                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     11,742                    
Fair value, ending balance 12,913 [15],[16],[29]   12,913 [15],[16],[29]   11,742 [12],[13]                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien                          
Principal Amount or Par Value [15],[21],[25] $ 13,155   $ 13,155                    
Spread [15],[25] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 13,058   $ 13,058                    
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 2,631   2,631                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 2,894   2,894                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (22)   (22)                    
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien                          
Principal Amount or Par Value [15],[21],[25] $ 6,156   $ 6,156                    
Spread [15],[25] 7.00%   7.00%     7.00% 7.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 6,156   $ 6,156                    
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 63   $ 63                    
Spread [15],[16],[22] 7.00%   7.00%     7.00% 7.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 63   $ 63                    
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22],[38] 354   354                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[38] 0   0                    
Investment, Identifier [Axis]: Bamboo Health Intermediate Holdings (fka Appriss Health Intermediate Holdings, Inc.)., Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[38] 2,999   2,999                    
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 2,154   2,154                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Drawn 1                          
Principal Amount or Par Value [15],[21],[22],[39] $ 1,326   $ 1,326                    
Spread [15],[22],[39] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[22],[39] $ 1,319   $ 1,319                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Drawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] $ 518   $ 518                    
Spread [15],[16],[22] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 516   $ 516                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value 376 [15],[16],[21],[22]   376 [15],[16],[21],[22]   2,292 [12],[17],[18],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[40]     0                    
Fair value, ending balance (2) [15],[16],[22]   (2) [15],[16],[22]   0 [12],[18],[40]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [15],[21],[22],[39] 963   963                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[22],[39] (5)   (5)                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 3                          
Principal Amount or Par Value [15],[16],[21],[22] 1,594   1,594                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (8)   (8)                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 1                          
Principal Amount or Par Value [15],[21],[39] $ 20,120   $ 20,120                    
Spread [15],[39] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 20,020   $ 20,020                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 2                          
Principal Amount or Par Value [15],[21],[23] $ 7,867   $ 7,867                    
Spread [15],[23] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 7,827   $ 7,827                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 3                          
Principal Amount or Par Value [12],[17],[40]         $ 20,171                
Spread [12],[40]         5.00%     5.00% 5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     20,070                    
Fair value, ending balance [12],[40]         $ 20,070                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc.n, First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         1,146                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (6)                    
Fair value, ending balance [12],[13],[18]         (6)                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 8,462   $ 8,462                    
Spread [15],[16],[22] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 8,462   $ 8,462                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         852                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 2,264   2,264                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 1,447   1,447                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                          
Principal Amount or Par Value $ 16,444 [15],[21],[23]   $ 16,444 [15],[21],[23]   $ 16,487 [12],[17],[19]                
Spread 5.00% [15],[23]   5.00% [15],[23]   5.50% [12],[19] 5.00% [15],[23] 5.00% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 16,487                    
Fair value, ending balance $ 16,444 [15],[23]   16,444 [15],[23]   $ 16,487 [12],[19]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                          
Principal Amount or Par Value $ 3,398 [15],[21],[23]   $ 3,398 [15],[21],[23]   $ 3,407 [12],[17],[19]                
Spread 5.00% [15],[23]   5.00% [15],[23]   5.50% [12],[19] 5.00% [15],[23] 5.00% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 3,407                    
Fair value, ending balance $ 3,398 [15],[23]   3,398 [15],[23]   $ 3,407 [12],[19]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                          
Principal Amount or Par Value $ 761 [15],[21],[23]   $ 761 [15],[21],[23]   $ 763 [12],[17],[19]                
Spread 5.00% [15],[23]   5.00% [15],[23]   5.50% [12],[19] 5.00% [15],[23] 5.00% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 763                    
Fair value, ending balance $ 761 [15],[23]   761 [15],[23]   $ 763 [12],[19]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                          
Principal Amount or Par Value $ 341 [15],[21],[23]   $ 341 [15],[21],[23]   $ 342 [12],[17],[19]                
Spread 5.00% [15],[23]   5.00% [15],[23]   5.50% [12],[19] 5.00% [15],[23] 5.00% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 342                    
Fair value, ending balance $ 341 [15],[23]   341 [15],[23]   $ 342 [12],[19]                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                          
Principal Amount or Par Value $ 272 [15],[21],[23]   $ 272 [15],[21],[23]   $ 273 [12],[17],[19]                
Spread 5.00% [15],[23]   5.00% [15],[23]   5.50% [12],[19] 5.00% [15],[23] 5.00% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 273                    
Fair value, ending balance $ 272 [15],[23]   272 [15],[23]   $ 273 [12],[19]                
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                          
Principal Amount or Par Value $ 11,242 [15],[21],[23]   $ 11,242 [15],[21],[23]   $ 11,188 [12],[17],[19]                
Spread 6.25% [15],[23],[30]   6.25% [15],[23],[30]   6.25% [12],[19],[33] 6.25% [15],[23],[30] 6.25% [15],[23],[30] 6.25% [12],[19],[33] 6.25% [12],[19],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 9,775                    
Fair value, ending balance $ 10,044 [15],[23]   10,044 [15],[23]   $ 9,775 [12],[19]                
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                          
Principal Amount or Par Value $ 3,349 [15],[21],[23]   $ 3,349 [15],[21],[23]   $ 3,333 [12],[17],[19]                
Spread 6.25% [15],[23],[30]   6.25% [15],[23],[30]   6.25% [12],[19],[33] 6.25% [15],[23],[30] 6.25% [15],[23],[30] 6.25% [12],[19],[33] 6.25% [12],[19],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 2,912                    
Fair value, ending balance $ 2,992 [15],[23]   2,992 [15],[23]   $ 2,912 [12],[19]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                          
Principal Amount or Par Value $ 8,447 [15],[21],[23]   $ 8,447 [15],[21],[23]   $ 8,403 [12],[17],[19]                
Spread 6.75% [15],[23],[30]   6.75% [15],[23],[30]   6.75% [12],[19],[33] 6.75% [15],[23],[30] 6.75% [15],[23],[30] 6.75% [12],[19],[33] 6.75% [12],[19],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 8,039                    
Fair value, ending balance $ 8,366 [15],[23]   8,366 [15],[23]   $ 8,039 [12],[19]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                          
Principal Amount or Par Value $ 945 [15],[16],[21],[22]   $ 945 [15],[16],[21],[22]   $ 935 [12],[13],[17],[18]                
Spread 6.75% [15],[16],[22],[30]   6.75% [15],[16],[22],[30]   6.75% [12],[13],[18],[33] 6.75% [15],[16],[22],[30] 6.75% [15],[16],[22],[30] 6.75% [12],[13],[18],[33] 6.75% [12],[13],[18],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 894                    
Fair value, ending balance $ 936 [15],[16],[22]   936 [15],[16],[22]   $ 894 [12],[13],[18]                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                          
Principal Amount or Par Value 226 [15],[16],[21],[22]   226 [15],[16],[21],[22]   226 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (10)                    
Fair value, ending balance (2) [15],[16],[22]   (2) [15],[16],[22]   (10) [12],[13],[18]                
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 1                          
Principal Amount or Par Value [12],[17],[20]         $ 7,012                
Spread [12],[20]         8.75%     8.75% 8.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     7,012                    
Fair value, ending balance [12],[20]         $ 7,012                
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 2                          
Principal Amount or Par Value [12],[13],[17]         $ 4,453                
Spread [12],[13]         8.75%     8.75% 8.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     4,454                    
Fair value, ending balance [12],[13]         $ 4,454                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 1                          
Principal Amount or Par Value $ 18,266 [16],[21]   $ 18,266 [16],[21]   $ 18,266 [12],[13],[17]                
Spread 7.25% [16]   7.25% [16]   7.25% [12],[13] 7.25% [16] 7.25% [16] 7.25% [12],[13] 7.25% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 18,184                    
Fair value, ending balance $ 18,266 [16]   18,266 [16]   $ 18,184 [12],[13]                
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 2                          
Principal Amount or Par Value $ 7,500 [21],[25]   $ 7,500 [21],[25]   $ 7,500 [12],[17],[24]                
Spread 7.25% [25]   7.25% [25]   7.25% [12],[24] 7.25% [25] 7.25% [25] 7.25% [12],[24] 7.25% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 7,467                    
Fair value, ending balance $ 7,500 [25]   7,500 [25]   $ 7,467 [12],[24]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien                          
Principal Amount or Par Value [17],[40]         $ 12,347                
Spread [40]         7.13%     7.13% 7.13%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [40]     12,224                    
Fair value, ending balance [40]         $ 12,224                
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                          
Principal Amount or Par Value [13],[17],[18]         $ 850                
Spread [13],[18]         7.13%     7.13% 7.13%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13],[18]     841                    
Fair value, ending balance [13],[18]         $ 841                
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                          
Principal Amount or Par Value 1,487 [15],[16],[21],[22]   1,487 [15],[16],[21],[22]   637 [13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13],[18]     (6)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (6) [13],[18]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien 1                          
Principal Amount or Par Value [15],[21],[39] $ 12,347   $ 12,347                    
Spread [15],[39] 7.13%   7.13%     7.13% 7.13%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 12,347   $ 12,347                    
Investment, Identifier [Axis]: Calabrio, Inc., First lien 2                          
Principal Amount or Par Value [15],[21],[39] $ 1,582   $ 1,582                    
Spread [15],[39] 7.13%   7.13%     7.13% 7.13%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 1,582   $ 1,582                    
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                          
Principal Amount or Par Value [21],[26] $ 11,791   $ 11,791                    
Spread [26] 4.50%   4.50%     4.50% 4.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [26] $ 11,091   $ 11,091                    
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien 1                          
Principal Amount or Par Value [17],[20]         $ 11,852                
Spread [20]         4.50%     4.50% 4.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [20]     10,919                    
Fair value, ending balance [20]         $ 10,919                
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                          
Principal Amount or Par Value $ 9,767 [15],[21],[26]   $ 9,767 [15],[21],[26]   $ 9,767 [12],[17],[20]                
Spread 7.75% [15],[26]   7.75% [15],[26]   7.75% [12],[20] 7.75% [15],[26] 7.75% [15],[26] 7.75% [12],[20] 7.75% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 8,975                    
Fair value, ending balance $ 9,306 [15],[26]   9,306 [15],[26]   $ 8,975 [12],[20]                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, First Lien                          
Principal Amount or Par Value [15],[21],[23] $ 35,238   $ 35,238                    
Spread [15],[23],[30] 3.00%   3.00%     3.00% 3.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 35,238   $ 35,238                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 3,980   3,980                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second Lien 1                          
Principal Amount or Par Value [12],[13],[17]         $ 47,838                
Spread [12],[13]         7.50%     7.50% 7.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     45,072                    
Fair value, ending balance [12],[13]         $ 45,072                
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second Lien 2                          
Principal Amount or Par Value [12],[17],[24]         $ 7,500                
Spread [12],[24]         7.50%     7.50% 7.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     7,066                    
Fair value, ending balance [12],[24]         $ 7,066                
Investment, Identifier [Axis]: Ciklum Inc., First lien                          
Principal Amount or Par Value [15],[21],[23],[29] $ 9,584   $ 9,584                    
Spread [15],[23],[29] 7.00%   7.00%     7.00% 7.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23],[29] $ 9,584   $ 9,584                    
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 11,955   11,955                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 2,989   2,989                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: CommerceHub, Inc., First lien                          
Principal Amount or Par Value $ 3,940 [15],[16],[21]   $ 3,940 [15],[16],[21]   $ 3,960 [12],[13],[17]                
Spread 6.25% [15],[16]   6.25% [15],[16]   6.25% [12],[13] 6.25% [15],[16] 6.25% [15],[16] 6.25% [12],[13] 6.25% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 3,960                    
Fair value, ending balance $ 3,940 [15],[16]   3,940 [15],[16]   $ 3,960 [12],[13]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC First lien - Undrawn                          
Principal Amount or Par Value [16],[21],[22] 425   425                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[22] 0   0                    
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien                          
Principal Amount or Par Value $ 7,055 [21],[23]   $ 7,055 [21],[23]   $ 7,091 [12],[17],[19]                
Spread 5.50% [23]   5.50% [23]   5.50% [12],[19] 5.50% [23] 5.50% [23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 6,899                    
Fair value, ending balance $ 7,055 [23]   7,055 [23]   $ 6,899 [12],[19]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         425                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (11)                    
Fair value, ending balance [12],[13],[18]         (11)                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         849                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (23)                    
Fair value, ending balance [12],[13],[18]         (23)                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                          
Principal Amount or Par Value $ 18,926 [15],[21],[26]   $ 18,926 [15],[21],[26]   $ 19,022 [12],[17],[20]                
Spread 5.25% [15],[26]   5.25% [15],[26]   5.25% [12],[20] 5.25% [15],[26] 5.25% [15],[26] 5.25% [12],[20] 5.25% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 16,768                    
Fair value, ending balance $ 16,307 [15],[26]   16,307 [15],[26]   $ 16,768 [12],[20]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                          
Principal Amount or Par Value $ 3,160 [15],[21],[26]   $ 3,160 [15],[21],[26]   $ 3,176 [12],[17],[20]                
Spread 5.25% [15],[26]   5.25% [15],[26]   5.25% [12],[20] 5.25% [15],[26] 5.25% [15],[26] 5.25% [12],[20] 5.25% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 2,800                    
Fair value, ending balance $ 2,723 [15],[26]   2,723 [15],[26]   $ 2,800 [12],[20]                
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien                          
Principal Amount or Par Value [15],[21],[25] $ 1,055   $ 1,055                    
Spread [15],[25] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 1,055   $ 1,055                    
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 578   578                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien                          
Principal Amount or Par Value [15],[21],[25] $ 14,460   $ 14,460                    
Spread [15],[25] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 14,460   $ 14,460                    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         1,291                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     13                    
Fair value, ending balance [12],[13],[18]         13                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         989                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 1,291   1,291                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 989   989                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 1                          
Principal Amount or Par Value [12],[17],[19]         $ 7,230                
Spread [12],[19]         7.50%     7.50% 7.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     7,303                    
Fair value, ending balance [12],[19]         $ 7,303                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 2                          
Principal Amount or Par Value [12],[17],[24]         $ 7,230                
Spread [12],[24]         7.50%     7.50% 7.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     7,303                    
Fair value, ending balance [12],[24]         $ 7,303                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                          
Principal Amount or Par Value [13],[17],[18]         1,013                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13],[18]     0                    
Fair value, ending balance [13],[18]         0                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 1                          
Principal Amount or Par Value [17],[40]         $ 13,653                
Spread [40]         6.00%     6.00% 6.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [40]     13,653                    
Fair value, ending balance [40]         $ 13,653                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 2                          
Principal Amount or Par Value [17],[40]         $ 2,457                
Spread [40]         8.00%     8.00% 8.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [40]     2,457                    
Fair value, ending balance [40]         $ 2,457                
Investment, Identifier [Axis]: Cube Industrials Buyer Inc., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 517   517                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Cube Industrials Buyer, Inc., First lien                          
Principal Amount or Par Value $ 4,472 [15],[16],[21]   $ 4,472 [15],[16],[21]   $ 4,483 [12],[13],[17]                
Spread 6.00% [15],[16]   6.00% [15],[16]   6.00% [12],[13] 6.00% [15],[16] 6.00% [15],[16] 6.00% [12],[13] 6.00% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 4,450                    
Fair value, ending balance $ 4,472 [15],[16]   4,472 [15],[16]   $ 4,450 [12],[13]                
Investment, Identifier [Axis]: Cube Industrials Buyer, Inc., First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         517                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (4)                    
Fair value, ending balance [12],[13],[18]         (4)                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien                          
Principal Amount or Par Value [12],[17],[19]         $ 1,823                
Spread [12],[19]         6.41%     6.41% 6.41%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     1,768                    
Fair value, ending balance [12],[19]         $ 1,768                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 1,021                
Spread [12],[13],[18]         6.50%     6.50% 6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     992                    
Fair value, ending balance [12],[13],[18]         $ 992                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                          
Principal Amount or Par Value [15],[21],[23] $ 1,813   $ 1,813                    
Spread [15],[23] 6.41%   6.41%     6.41% 6.41%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 1,777   $ 1,777                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                          
Principal Amount or Par Value [15],[16],[21] $ 1,016   $ 1,016                    
Spread [15],[16] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 997   $ 997                    
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                          
Principal Amount or Par Value $ 20,313 [16],[21]   $ 20,313 [16],[21]   $ 20,313 [13],[17]                
Spread 6.75% [16]   6.75% [16]   6.75% [13] 6.75% [16] 6.75% [16] 6.75% [13] 6.75% [13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13]     $ 18,333                    
Fair value, ending balance $ 19,953 [16]   19,953 [16]   $ 18,333 [13]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                          
Principal Amount or Par Value 2,405 [15],[16],[21],[22]   2,405 [15],[16],[21],[22]   2,405 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (43)                    
Fair value, ending balance (27) [15],[16],[22]   (27) [15],[16],[22]   (43) [12],[13],[18]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                          
Principal Amount or Par Value $ 18,478 [15],[21],[25]   $ 18,478 [15],[21],[25]   $ 18,572 [12],[17],[24]                
Spread 5.75% [15],[25]   5.75% [15],[25]   5.75% [12],[24] 5.75% [15],[25] 5.75% [15],[25] 5.75% [12],[24] 5.75% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 18,238                    
Fair value, ending balance $ 18,269 [15],[25]   18,269 [15],[25]   $ 18,238 [12],[24]                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                          
Principal Amount or Par Value $ 6,920 [15],[21],[26]   $ 6,920 [15],[21],[26]   $ 6,955 [12],[17],[20]                
Spread 5.75% [15],[26]   5.75% [15],[26]   5.75% [12],[20] 5.75% [15],[26] 5.75% [15],[26] 5.75% [12],[20] 5.75% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 6,830                    
Fair value, ending balance $ 6,842 [15],[26]   6,842 [15],[26]   $ 6,830 [12],[20]                
Investment, Identifier [Axis]: DOXA Insurance Holdings LLC., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 3,046   3,046                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First lien                          
Principal Amount or Par Value [12],[17],[19]         $ 7,472                
Spread [12],[19]         7.00%     7.00% 7.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     7,564                    
Fair value, ending balance [12],[19]         $ 7,564                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 148   $ 148                    
Spread [15],[16],[22] 4.50%   4.50%     4.50% 4.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 148   $ 148                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 66                
Spread [12],[13],[18]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     66                    
Fair value, ending balance [12],[13],[18]         $ 66                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 66                
Spread [12],[13],[18]         4.50%     4.50% 4.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     66                    
Fair value, ending balance [12],[13],[18]         $ 66                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 838   838                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         459                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         920                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                          
Principal Amount or Par Value $ 12,945 [15],[21],[25]   $ 12,945 [15],[21],[25]   $ 13,011 [12],[17],[24]                
Spread 5.50% [15],[25]   5.50% [15],[25]   5.50% [12],[24] 5.50% [15],[25] 5.50% [15],[25] 5.50% [12],[24] 5.50% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 13,011                    
Fair value, ending balance $ 12,945 [15],[25]   12,945 [15],[25]   $ 13,011 [12],[24]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                          
Principal Amount or Par Value $ 1,091 [15],[21],[23]   $ 1,091 [15],[21],[23]   $ 1,096 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.50% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 1,096                    
Fair value, ending balance $ 1,091 [15],[23]   1,091 [15],[23]   $ 1,096 [12],[19]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 3                          
Principal Amount or Par Value [15],[16],[21] $ 65   $ 65                    
Spread [15],[16] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 65   $ 65                    
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     74,768                    
Fair value, ending balance 74,308 [15],[16]   74,308 [15],[16]   74,768 [12],[13]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 2,623                
Spread [12],[13],[18]         5.75%     5.75% 5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     2,576                    
Fair value, ending balance [12],[13],[18]         $ 2,576                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 1                          
Principal Amount or Par Value $ 37,285 [15],[21],[23]   $ 37,285 [15],[21],[23]   $ 37,477 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.75% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 36,791                    
Fair value, ending balance $ 36,614 [15],[23]   36,614 [15],[23]   $ 36,791 [12],[19]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 2                          
Principal Amount or Par Value $ 3,925 [15],[16],[21]   $ 3,925 [15],[16],[21]   $ 3,945 [12],[13],[17]                
Spread 5.50% [15],[16]   5.50% [15],[16]   5.75% [12],[13] 5.50% [15],[16] 5.50% [15],[16] 5.75% [12],[13] 5.75% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 3,873                    
Fair value, ending balance $ 3,854 [15],[16]   3,854 [15],[16]   $ 3,873 [12],[13]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 3                          
Principal Amount or Par Value [15],[16],[21] $ 3,027   $ 3,027                    
Spread [15],[16] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 2,972   $ 2,972                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         404                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ (7)                    
Fair value, ending balance [12],[13],[18]         $ (7)                
Investment, Identifier [Axis]: Diamond Parent Holdings Corp, Wholly-owned subsidiaries                          
Number of investments held | investment 2   2   2 2 2 2 2        
Investment, Identifier [Axis]: Diligent Corporation , First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 1,667                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ (33)                    
Fair value, ending balance [12],[13],[18]         $ (33)                
Investment, Identifier [Axis]: Diligent Corporation , First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] $ 2,265   2,265                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] (8)   (8)                    
Investment, Identifier [Axis]: Diligent Corporation , First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 3,398   3,398                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ (13)   $ (13)                    
Investment, Identifier [Axis]: Diligent Corporation, First lien                          
Number of investments held | investment 3   3   3 3 3 3 3        
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 1,957                
Spread [12],[13],[18]         6.25%     6.25% 6.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 1,919                    
Fair value, ending balance [12],[13],[18]         $ 1,919                
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                          
Principal Amount or Par Value $ 3,398 [15],[16],[21]   $ 3,398 [15],[16],[21]   $ 17,404 [12],[17],[19]                
Spread 5.00% [15],[16]   5.00% [15],[16]   5.75% [12],[19] 5.00% [15],[16] 5.00% [15],[16] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 16,998                    
Fair value, ending balance $ 3,385 [15],[16]   3,385 [15],[16]   $ 16,998 [12],[19]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                          
Principal Amount or Par Value $ 19,821 [15],[21],[23]   $ 19,821 [15],[21],[23]   $ 5,768 [12],[13],[17]                
Spread 5.00% [15],[23]   5.00% [15],[23]   6.25% [12],[13] 5.00% [15],[23] 5.00% [15],[23] 6.25% [12],[13] 6.25% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 5,654                    
Fair value, ending balance $ 19,748 [15],[23]   19,748 [15],[23]   $ 5,654 [12],[13]                
Investment, Identifier [Axis]: Diligent Corporation, First lien 3                          
Principal Amount or Par Value [12],[17],[19]         $ 5,679                
Spread [12],[19]         5.75%     5.75% 5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     5,546                    
Fair value, ending balance [12],[19]         $ 5,546                
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Preferred equity dividend rate         10.50%                
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[41]     12,162                    
Fair value, ending balance 12,429 [15],[16],[42]   12,429 [15],[16],[42]   $ 12,162 [12],[13],[41]                
Investment, Identifier [Axis]: EAB Global, Inc., Second lien                          
Principal Amount or Par Value [12],[17],[19]         $ 14,868                
Spread [12],[19]         6.50%     6.50% 6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     14,868                    
Fair value, ending balance [12],[19]         $ 14,868                
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                          
Principal Amount or Par Value 10,676 [15],[21],[23]   10,676 [15],[21],[23]   10,676 [12],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     10,676                    
Fair value, ending balance 10,676 [15],[23]   10,676 [15],[23]   10,676 [12],[19]                
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 2                          
Principal Amount or Par Value 342 [15],[16],[21]   342 [15],[16],[21]   342 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     342                    
Fair value, ending balance 342 [15],[16]   342 [15],[16]   342 [12],[13]                
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC, Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     6,855                    
Fair value, ending balance 8,187 [15],[16]   8,187 [15],[16]   6,855 [12],[13]                
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 145   145                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Preferred shares 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 2,900   2,900                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Preferred shares 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 2,565   2,565                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc., Junior preferred shares, Non-accrual status                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance 2,565   2,565                    
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                          
Principal Amount or Par Value 20,354 [15],[16],[21],[43]   20,354 [15],[16],[21],[43]   $ 18,635 [12],[13],[17]                
Spread [12],[13],[33]         7.50%     7.50% 7.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     18,635                    
Fair value, ending balance $ 20,354 [15],[16],[43]   $ 20,354 [15],[16],[43]   $ 18,635 [12],[13]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien                          
Number of investments held | investment 3   3     3 3            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 1,173   $ 1,173                    
Spread [15],[16],[22] 5.75%   5.75%     5.75% 5.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 1,173   $ 1,173                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 4,503                
Spread [12],[13],[18]         6.00%     6.00% 6.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     4,466                    
Fair value, ending balance [12],[13],[18]         $ 4,466                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 315                
Spread [12],[13],[18]         5.75%     5.75% 5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     310                    
Fair value, ending balance [12],[13],[18]         $ 310                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22],[44] 228   228                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[44] 0   0                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         1,229                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (10)                    
Fair value, ending balance [12],[13],[18]         (10)                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         1,085                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (17)                    
Fair value, ending balance [12],[13],[18]         (17)                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                          
Principal Amount or Par Value $ 10,238 [15],[21],[39]   $ 10,238 [15],[21],[39]   $ 10,290 [12],[17],[40]                
Spread 5.75% [15],[39]   5.75% [15],[39]   5.75% [12],[40] 5.75% [15],[39] 5.75% [15],[39] 5.75% [12],[40] 5.75% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 10,125                    
Fair value, ending balance $ 10,238 [15],[39]   10,238 [15],[39]   $ 10,125 [12],[40]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                          
Principal Amount or Par Value $ 5,706 [15],[16],[21]   $ 5,706 [15],[16],[21]   $ 3,454 [12],[17],[40]                
Spread 6.00% [15],[16]   6.00% [15],[16]   5.75% [12],[40] 6.00% [15],[16] 6.00% [15],[16] 5.75% [12],[40] 5.75% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 3,398                    
Fair value, ending balance $ 5,706 [15],[16]   5,706 [15],[16]   $ 3,398 [12],[40]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                          
Principal Amount or Par Value $ 3,436 [15],[21],[39]   $ 3,436 [15],[21],[39]   $ 3,432 [12],[17],[40]                
Spread 5.75% [15],[39]   5.75% [15],[39]   5.75% [12],[40] 5.75% [15],[39] 5.75% [15],[39] 5.75% [12],[40] 5.75% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 3,378                    
Fair value, ending balance $ 3,436 [15],[39]   3,436 [15],[39]   $ 3,378 [12],[40]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 4                          
Principal Amount or Par Value [15],[21],[39] $ 3,415   $ 3,415                    
Spread [15],[39] 5.75%   5.75%     5.75% 5.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 3,415   $ 3,415                    
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC , Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40],[45]     4,454                    
Fair value, ending balance 4,437 [15],[39],[44]   4,437 [15],[39],[44]   4,454 [12],[40],[45]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 1,006                
Spread [12],[13],[18]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     1,006                    
Fair value, ending balance [12],[13],[18]         $ 1,006                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value 2,218 [15],[16],[21],[22]   2,218 [15],[16],[21],[22]   4,557 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         1,090                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 3                          
Principal Amount or Par Value [15],[16],[21],[22] 2,095   2,095                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                          
Principal Amount or Par Value $ 33,527 [15],[21],[23]   $ 33,527 [15],[21],[23]   $ 33,698 [12],[17],[19]                
Spread 5.25% [15],[23]   5.25% [15],[23]   5.50% [12],[19] 5.25% [15],[23] 5.25% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 33,698                    
Fair value, ending balance $ 33,527 [15],[23]   33,527 [15],[23]   $ 33,698 [12],[19]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                          
Principal Amount or Par Value $ 2,673 [15],[16],[21]   $ 2,673 [15],[16],[21]   $ 347 [12],[13],[17]                
Spread 5.25% [15],[16]   5.25% [15],[16]   5.50% [12],[13] 5.25% [15],[16] 5.25% [15],[16] 5.50% [12],[13] 5.50% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 347                    
Fair value, ending balance $ 2,673 [15],[16]   2,673 [15],[16]   $ 347 [12],[13]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC., First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 3,474   3,474                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 1                          
Principal Amount or Par Value $ 869 [15],[16],[21],[22]   $ 869 [15],[16],[21],[22]   $ 143 [12],[13],[17],[18]                
Spread 5.50% [15],[16],[22]   5.50% [15],[16],[22]   5.50% [12],[13],[18] 5.50% [15],[16],[22] 5.50% [15],[16],[22] 5.50% [12],[13],[18] 5.50% [12],[13],[18]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 142                    
Fair value, ending balance $ 869 [15],[16],[22]   869 [15],[16],[22]   $ 142 [12],[13],[18]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 2                          
Principal Amount or Par Value $ 572 [15],[16],[21],[22]   $ 572 [15],[16],[21],[22]   $ 138 [12],[13],[17],[18]                
Spread 5.50% [15],[16],[22]   5.50% [15],[16],[22]   5.50% [12],[13],[18] 5.50% [15],[16],[22] 5.50% [15],[16],[22] 5.50% [12],[13],[18] 5.50% [12],[13],[18]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 138                    
Fair value, ending balance $ 572 [15],[16],[22]   572 [15],[16],[22]   $ 138 [12],[13],[18]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value 3,702 [15],[16],[21],[22]   3,702 [15],[16],[21],[22]   2,718 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (17)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (17) [12],[13],[18]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value 2,288 [15],[16],[21],[22]   2,288 [15],[16],[21],[22]   4,435 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (28)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (28) [12],[13],[18]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                          
Principal Amount or Par Value $ 17,264 [15],[21],[23]   $ 17,264 [15],[21],[23]   $ 17,353 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.50% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 17,243                    
Fair value, ending balance $ 17,264 [15],[23]   17,264 [15],[23]   $ 17,243 [12],[19]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                          
Principal Amount or Par Value $ 10,041 [15],[21],[25]   $ 10,041 [15],[21],[25]   $ 10,092 [12],[17],[24]                
Spread 5.50% [15],[25]   5.50% [15],[25]   5.50% [12],[24] 5.50% [15],[25] 5.50% [15],[25] 5.50% [12],[24] 5.50% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 10,028                    
Fair value, ending balance $ 10,041 [15],[25]   10,041 [15],[25]   $ 10,028 [12],[24]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                          
Principal Amount or Par Value $ 1,172 [15],[16],[21]   $ 1,172 [15],[16],[21]   $ 1,178 [12],[13],[17]                
Spread 5.50% [15],[16]   5.50% [15],[16]   5.50% [12],[13] 5.50% [15],[16] 5.50% [15],[16] 5.50% [12],[13] 5.50% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 1,171                    
Fair value, ending balance $ 1,172 [15],[16]   1,172 [15],[16]   $ 1,171 [12],[13]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 4                          
Principal Amount or Par Value $ 80 [15],[16],[21]   $ 80 [15],[16],[21]   $ 80 [12],[13],[17]                
Spread 5.50% [15],[16]   5.50% [15],[16]   5.50% [12],[13] 5.50% [15],[16] 5.50% [15],[16] 5.50% [12],[13] 5.50% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 80                    
Fair value, ending balance $ 80 [15],[16]   80 [15],[16]   $ 80 [12],[13]                
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                          
Principal Amount or Par Value $ 22,500 [15],[21],[39]   $ 22,500 [15],[21],[39]   $ 22,500 [12],[17],[40]                
Spread 6.50% [15],[39]   6.50% [15],[39]   6.50% [12],[40] 6.50% [15],[39] 6.50% [15],[39] 6.50% [12],[40] 6.50% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 22,100                    
Fair value, ending balance $ 22,500 [15],[39]   22,500 [15],[39]   $ 22,100 [12],[40]                
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                          
Principal Amount or Par Value $ 7,009 [15],[21],[23]   $ 7,009 [15],[21],[23]   $ 7,009 [12],[17],[19]                
Spread 6.50% [15],[23]   6.50% [15],[23]   6.50% [12],[19] 6.50% [15],[23] 6.50% [15],[23] 6.50% [12],[19] 6.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 6,884                    
Fair value, ending balance $ 7,009 [15],[23]   7,009 [15],[23]   $ 6,884 [12],[19]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien 3                          
Principal Amount or Par Value [15],[21],[23] $ 448   $ 448                    
Spread [15],[23] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 448   $ 448                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien - Drawn                          
Principal Amount or Par Value [12],[17],[18],[19]         $ 451                
Spread [12],[18],[19]         6.00%     6.00% 6.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     451                    
Fair value, ending balance [12],[18],[19]         $ 451                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien 1                          
Principal Amount or Par Value $ 40,067 [15],[21],[23]   $ 40,067 [15],[21],[23]   $ 40,270 [12],[17],[19]                
Spread 5.25% [15],[23]   5.25% [15],[23]   6.00% [12],[19] 5.25% [15],[23] 5.25% [15],[23] 6.00% [12],[19] 6.00% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 40,270                    
Fair value, ending balance $ 40,067 [15],[23]   40,067 [15],[23]   $ 40,270 [12],[19]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien 2                          
Principal Amount or Par Value $ 21,557 [15],[21],[39]   $ 21,557 [15],[21],[39]   $ 21,666 [12],[17],[40]                
Spread 5.25% [15],[39]   5.25% [15],[39]   6.00% [12],[40] 5.25% [15],[39] 5.25% [15],[39] 6.00% [12],[40] 6.00% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 21,666                    
Fair value, ending balance $ 21,557 [15],[39]   21,557 [15],[39]   $ 21,666 [12],[40]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn                          
Principal Amount or Par Value 3,951 [15],[16],[21],[22]   3,951 [15],[16],[21],[22]   3,951 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: GEDC Equity, LLC, Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     150                    
Fair value, ending balance 100 [15],[16]   100 [15],[16]   150 [12],[13]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First Lien 2                          
Principal Amount or Par Value [15],[21],[39] $ 21,409   $ 21,409                    
Spread [15],[39] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 21,409   $ 21,409                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First Lien - Drawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] $ 233   $ 233                    
Spread [15],[16],[22] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 233   $ 233                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First Lien 1                          
Principal Amount or Par Value $ 34,902 [15],[21],[23]   $ 34,902 [15],[21],[23]   $ 34,023 [12],[17],[19]                
Spread 5.25% [15],[23]   5.25% [15],[23]   5.50% [12],[19] 5.25% [15],[23] 5.25% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 34,023                    
Fair value, ending balance $ 34,902 [15],[23]   34,902 [15],[23]   $ 34,023 [12],[19]                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First Lien 2                          
Principal Amount or Par Value [12],[17],[40]         $ 21,521                
Spread [12],[40]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     21,521                    
Fair value, ending balance [12],[40]         $ 21,521                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First Lien Drawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] $ 643   $ 643                    
Spread [15],[16],[22] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 643   $ 643                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         3,730                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 4,132   4,132                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 4,179   4,179                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Galway Borrower LLC, First lien                          
Principal Amount or Par Value [15],[21],[23] $ 1,218   $ 1,218                    
Spread [15],[23] 5.75%   5.75%     5.75% 5.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 1,218   $ 1,218                    
Investment, Identifier [Axis]: Galway Borrower LLC, First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 1,846   1,846                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Geo Parent Corporation, First lien                          
Principal Amount or Par Value [15],[21],[23] $ 3,299   $ 3,299                    
Spread [15],[23] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 3,299   $ 3,299                    
Investment, Identifier [Axis]: Granicus, Inc., First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 579                
Spread [12],[13],[18]         6.50%     6.50% 6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     579                    
Fair value, ending balance [12],[13],[18]         $ 579                
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         1,834                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Granicus, Inc., First lien 1                          
Principal Amount or Par Value [12],[17],[20]         $ 15,463                
Spread [12],[20],[33]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     15,463                    
Fair value, ending balance [12],[20]         $ 15,463                
Investment, Identifier [Axis]: Granicus, Inc., First lien 2                          
Principal Amount or Par Value [12],[17],[24]         $ 5,981                
Spread [12],[24],[33]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     5,981                    
Fair value, ending balance [12],[24]         $ 5,981                
Investment, Identifier [Axis]: Granicus, Inc., First lien 3                          
Principal Amount or Par Value [12],[17],[19]         $ 5,899                
Spread [12],[19],[33]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     5,899                    
Fair value, ending balance [12],[19]         $ 5,899                
Investment, Identifier [Axis]: Granicus, Inc., First lien 4                          
Principal Amount or Par Value [12],[17],[19]         $ 4,542                
Spread [12],[19]         6.00%     6.00% 6.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     4,542                    
Fair value, ending balance [12],[19]         $ 4,542                
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien                          
Principal Amount or Par Value [21],[23] $ 17,946   $ 17,946                    
Spread [23] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [23] $ 17,901   $ 17,901                    
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [16],[21],[22] 4,486   4,486                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[22] (11)   (11)                    
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [16],[21],[22] 1,682   1,682                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[22] (4)   (4)                    
Investment, Identifier [Axis]: Greenway Health, LLC, First lien                          
Principal Amount or Par Value $ 6,333 [15],[21],[25]   $ 6,333 [15],[21],[25]   $ 6,349 [17],[24]                
Spread 6.75% [15],[25]   6.75% [15],[25]   6.75% [24] 6.75% [15],[25] 6.75% [15],[25] 6.75% [24] 6.75% [24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [24]     $ 6,254                    
Fair value, ending balance $ 6,333 [15],[25]   6,333 [15],[25]   $ 6,254 [24]                
Investment, Identifier [Axis]: Groundworks, LLC, First lien                          
Principal Amount or Par Value $ 19,003 [21],[26]   $ 19,003 [21],[26]   $ 19,517 [12],[17],[20]                
Spread 3.50% [26]   3.50% [26]   6.50% [12],[20] 3.50% [26] 3.50% [26] 6.50% [12],[20] 6.50% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 19,330                    
Fair value, ending balance $ 19,014 [26]   19,014 [26]   $ 19,330 [12],[20]                
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Drawn                          
Principal Amount or Par Value [21],[22],[26] $ 560   $ 560                    
Spread [22],[26] 3.50%   3.50%     3.50% 3.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [22],[26] $ 560   $ 560                    
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn                          
Principal Amount or Par Value [21],[22],[26] 2,938   2,938                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [22],[26] $ 2   2                    
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [12],[17],[18],[20]         891                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[20]     (9)                    
Fair value, ending balance [12],[18],[20]         (9)                
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         1,076                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (10)                    
Fair value, ending balance [12],[13],[18]         (10)                
Investment, Identifier [Axis]: HB Wealth Management, LLC, Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[46]     $ 5,125                    
Fair value, ending balance [12],[46]         5,125                
Investment, Identifier [Axis]: HB Wealth Management, LLC., Preferred shares                          
Spread [15],[47] 4.00%   4.00%     4.00% 4.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[47] $ 6,594   $ 6,594                    
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                          
Principal Amount or Par Value $ 22,500 [15],[21],[39]   $ 22,500 [15],[21],[39]   $ 22,500 [12],[17],[40]                
Spread 6.75% [15],[39]   6.75% [15],[39]   6.75% [12],[40] 6.75% [15],[39] 6.75% [15],[39] 6.75% [12],[40] 6.75% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 21,059                    
Fair value, ending balance $ 20,079 [15],[39]   20,079 [15],[39]   $ 21,059 [12],[40]                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                          
Principal Amount or Par Value $ 4,208 [15],[21],[23]   $ 4,208 [15],[21],[23]   $ 4,208 [12],[17],[19]                
Spread 6.75% [15],[23]   6.75% [15],[23]   6.75% [12],[19] 6.75% [15],[23] 6.75% [15],[23] 6.75% [12],[19] 6.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 3,938                    
Fair value, ending balance $ 3,755 [15],[23]   3,755 [15],[23]   $ 3,938 [12],[19]                
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[48]     3,323                    
Fair value, ending balance 569 [15],[49]   569 [15],[49]   3,323 [12],[48]                
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Profit Interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[50]     96                    
Fair value, ending balance 100 [15],[51]   100 [15],[51]   96 [12],[50]                
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                          
Principal Amount or Par Value 8,000 [15],[16],[21],[22]   8,000 [15],[16],[21],[22]   8,000 [12],[13],[17],[18],[52]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18],[52]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18],[52]                
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien                          
Principal Amount or Par Value $ 5,095 [15],[21],[25]   $ 5,095 [15],[21],[25]   $ 5,120 [12],[17],[24]                
Spread 5.50% [15],[25]   5.50% [15],[25]   5.75% [12],[24] 5.50% [15],[25] 5.50% [15],[25] 5.75% [12],[24] 5.75% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 5,069                    
Fair value, ending balance $ 5,095 [15],[25]   5,095 [15],[25]   $ 5,069 [12],[24]                
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien - Undrawn                          
Principal Amount or Par Value 1,229 [15],[16],[21],[22]   1,229 [15],[16],[21],[22]   1,229 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (12)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (12) [12],[13],[18]                
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 890   $ 890                    
Spread [15],[16],[22] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 890   $ 890                    
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 7,107   7,107                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien 1                          
Principal Amount or Par Value [15],[21],[25] $ 2,044   $ 2,044                    
Spread [15],[25] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 2,044   $ 2,044                    
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien 2                          
Principal Amount or Par Value [15],[21],[25] $ 1,380   $ 1,380                    
Spread [15],[25] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 1,380   $ 1,380                    
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien 3                          
Principal Amount or Par Value [15],[21],[25] $ 402   $ 402                    
Spread [15],[25] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 402   $ 402                    
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company, First lien                          
Principal Amount or Par Value $ 14,558 [21],[25]   $ 14,558 [21],[25]   $ 6,822 [17],[24]                
Spread 5.25% [25]   5.25% [25]   5.25% [24] 5.25% [25] 5.25% [25] 5.25% [24] 5.25% [24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [24]     $ 6,704                    
Fair value, ending balance $ 13,889 [25]   13,889 [25]   $ 6,704 [24]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                          
Principal Amount or Par Value 3,780 [15],[16],[21],[22]   3,780 [15],[16],[21],[22]   2,298 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                          
Principal Amount or Par Value $ 28,691 [15],[21],[23]   $ 28,691 [15],[21],[23]   $ 28,839 [12],[17],[19]                
Spread 6.00% [15],[23]   6.00% [15],[23]   6.00% [12],[19] 6.00% [15],[23] 6.00% [15],[23] 6.00% [12],[19] 6.00% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 28,839                    
Fair value, ending balance $ 28,691 [15],[23]   28,691 [15],[23]   $ 28,839 [12],[19]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                          
Principal Amount or Par Value $ 4,192 [15],[21],[23]   $ 4,192 [15],[21],[23]   $ 4,214 [12],[17],[19]                
Spread 6.00% [15],[23]   6.00% [15],[23]   6.00% [12],[19] 6.00% [15],[23] 6.00% [15],[23] 6.00% [12],[19] 6.00% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 4,214                    
Fair value, ending balance $ 4,192 [15],[23]   4,192 [15],[23]   $ 4,214 [12],[19]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 3                          
Principal Amount or Par Value [15],[21],[25] $ 1,690   $ 1,690                    
Spread [15],[25] 6.00%   6.00%     6.00% 6.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 1,690   $ 1,690                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 4                          
Principal Amount or Par Value [15],[21],[25] $ 635   $ 635                    
Spread [15],[25] 6.00%   6.00%     6.00% 6.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 635   $ 635                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 5                          
Principal Amount or Par Value [15],[21],[25] $ 223   $ 223                    
Spread [15],[25] 6.00%   6.00%     6.00% 6.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 223   $ 223                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien 2                          
Principal Amount or Par Value [15],[16],[21] $ 1,633   $ 1,633                    
Spread [15],[16] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 1,633   $ 1,633                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 1,139                
Spread [12],[13],[18]         6.00%     6.00% 6.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     1,130                    
Fair value, ending balance [12],[13],[18]         $ 1,130                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 62                
Spread [12],[13],[18]         6.00%     6.00% 6.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     61                    
Fair value, ending balance [12],[13],[18]         $ 61                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 1,548   1,548                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         1,487                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (12)                    
Fair value, ending balance [12],[13],[18]         (12)                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         1,951                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (16)                    
Fair value, ending balance [12],[13],[18]         (16)                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien 1                          
Principal Amount or Par Value $ 12,779 [15],[21],[23]   $ 12,779 [15],[21],[23]   $ 12,844 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   6.00% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 6.00% [12],[19] 6.00% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 12,742                    
Fair value, ending balance $ 12,779 [15],[23]   12,779 [15],[23]   $ 12,742 [12],[19]                
Investment, Identifier [Axis]: Icefall Parent, Inc. First lien                          
Principal Amount or Par Value [15],[21],[25] $ 8,696   $ 8,696                    
Spread [15],[25] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 8,696   $ 8,696                    
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 828   828                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                          
Principal Amount or Par Value $ 15,091 [15],[21],[26]   $ 15,091 [15],[21],[26]   $ 22,500 [12],[17],[20]                
Spread 6.75% [15],[26]   6.75% [15],[26]   6.75% [12],[20] 6.75% [15],[26] 6.75% [15],[26] 6.75% [12],[20] 6.75% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 22,500                    
Fair value, ending balance $ 15,091 [15],[26]   15,091 [15],[26]   $ 22,500 [12],[20]                
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                          
Principal Amount or Par Value $ 2,012 [15],[16],[21]   $ 2,012 [15],[16],[21]   $ 3,000 [12],[13],[17]                
Spread 6.75% [15],[16]   6.75% [15],[16]   6.75% [12],[13] 6.75% [15],[16] 6.75% [15],[16] 6.75% [12],[13] 6.75% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 3,000                    
Fair value, ending balance $ 2,012 [15],[16]   2,012 [15],[16]   $ 3,000 [12],[13]                
Investment, Identifier [Axis]: Infogain Corporation, First Lien 1                          
Principal Amount or Par Value $ 18,372 [15],[21],[23]   $ 18,372 [15],[21],[23]   $ 18,707 [12],[17],[19]                
Spread 5.75% [15],[23]   5.75% [15],[23]   5.50% [12],[19] 5.75% [15],[23] 5.75% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 18,707                    
Fair value, ending balance $ 18,372 [15],[23]   18,372 [15],[23]   $ 18,707 [12],[19]                
Investment, Identifier [Axis]: Infogain Corporation, First Lien 2                          
Principal Amount or Par Value $ 7,804 [15],[21],[25]   $ 7,804 [15],[21],[25]   $ 7,844 [12],[17],[24]                
Spread 5.75% [15],[25]   5.75% [15],[25]   5.50% [12],[24] 5.75% [15],[25] 5.75% [15],[25] 5.50% [12],[24] 5.50% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 7,844                    
Fair value, ending balance $ 7,804 [15],[25]   7,804 [15],[25]   $ 7,844 [12],[24]                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                          
Principal Amount or Par Value 3,827 [15],[16],[21],[22]   3,827 [15],[16],[21],[22]   3,827 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                          
Principal Amount or Par Value $ 17,245 [15],[16],[21]   $ 17,245 [15],[16],[21]   $ 17,245 [12],[13],[17]                
Spread 8.25% [15],[16]   8.25% [15],[16]   8.25% [12],[13] 8.25% [15],[16] 8.25% [15],[16] 8.25% [12],[13] 8.25% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 17,245                    
Fair value, ending balance $ 17,245 [15],[16]   17,245 [15],[16]   $ 17,245 [12],[13]                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                          
Principal Amount or Par Value 4,349 [15],[21],[23]   4,349 [15],[21],[23]   4,086 [12],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     4,086                    
Fair value, ending balance 4,349 [15],[23]   4,349 [15],[23]   4,086 [12],[19]                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                          
Principal Amount or Par Value 859 [15],[16],[21]   859 [15],[16],[21]   807 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     807                    
Fair value, ending balance 858 [15],[16]   858 [15],[16]   807 [12],[13]                
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                          
Principal Amount or Par Value 14,897 [15],[16],[21]   14,897 [15],[16],[21]   13,657 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     13,231                    
Fair value, ending balance 14,897 [15],[16]   14,897 [15],[16]   13,231 [12],[13]                
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 1                          
Principal Amount or Par Value [12],[17],[19]         $ 18,750                
Spread [12],[19]         8.00%     8.00% 8.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     17,079                    
Fair value, ending balance [12],[19]         $ 17,079                
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 2                          
Principal Amount or Par Value [12],[17],[24]         $ 18,750                
Spread [12],[24]         8.00%     8.00% 8.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     17,079                    
Fair value, ending balance [12],[24]         $ 17,079                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 19   $ 19                    
Spread [15],[16],[22] 5.75%   5.75%     5.75% 5.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 19   $ 19                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn 1                          
Principal Amount or Par Value [12],[17],[18],[19]         $ 1,160                
Spread [12],[18],[19]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     1,138                    
Fair value, ending balance [12],[18],[19]         $ 1,138                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 19                
Spread [12],[13],[18]         5.75%     5.75% 5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     19                    
Fair value, ending balance [12],[13],[18]         $ 19                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                          
Principal Amount or Par Value 1,568 [15],[16],[21],[22]   1,568 [15],[16],[21],[22]   1,568 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (16)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (16) [12],[13],[18]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                          
Principal Amount or Par Value $ 6,862 [15],[21],[25]   $ 6,862 [15],[21],[25]   $ 6,898 [12],[17],[24]                
Spread 5.50% [15],[25]   5.50% [15],[25]   5.25% [12],[24] 5.50% [15],[25] 5.50% [15],[25] 5.25% [12],[24] 5.25% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 6,763                    
Fair value, ending balance $ 6,862 [15],[25]   6,862 [15],[25]   $ 6,763 [12],[24]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                          
Principal Amount or Par Value $ 1,155 [15],[21],[25]   $ 1,155 [15],[21],[25]   $ 790 [12],[17],[19]                
Spread 5.50% [15],[25]   5.50% [15],[25]   5.25% [12],[19] 5.50% [15],[25] 5.50% [15],[25] 5.25% [12],[19] 5.25% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 774                    
Fair value, ending balance $ 1,155 [15],[25]   1,155 [15],[25]   $ 774 [12],[19]                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 3                          
Principal Amount or Par Value [15],[21],[25] $ 786   $ 786                    
Spread [15],[25] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 786   $ 786                    
Investment, Identifier [Axis]: Kaseya Inc., First lien                          
Principal Amount or Par Value [12],[17],[19]         $ 63,633                
Spread [12],[19],[33]         3.50%     3.50% 3.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     63,633                    
Fair value, ending balance [12],[19]         $ 63,633                
Investment, Identifier [Axis]: Kaseya Inc., First lien 1                          
Principal Amount or Par Value [15],[21],[23] $ 64,440   $ 64,440                    
Spread [15],[23] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 64,440   $ 64,440                    
Investment, Identifier [Axis]: Kaseya Inc., First lien 2                          
Principal Amount or Par Value [15],[16],[21] $ 238   $ 238                    
Spread [15],[16] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 238   $ 238                    
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 1                          
Principal Amount or Par Value $ 973 [15],[16],[21],[22]   $ 973 [15],[16],[21],[22]   $ 973 [12],[13],[17],[18]                
Spread 5.50% [15],[16],[22]   5.50% [15],[16],[22]   5.50% [12],[13],[18] 5.50% [15],[16],[22] 5.50% [15],[16],[22] 5.50% [12],[13],[18] 5.50% [12],[13],[18]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 973                    
Fair value, ending balance $ 973 [15],[16],[22]   973 [15],[16],[22]   $ 973 [12],[13],[18]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 2                          
Principal Amount or Par Value $ 193 [15],[16],[21],[22]   $ 193 [15],[16],[21],[22]   $ 237 [12],[13],[17],[18]                
Spread 5.50% [15],[16],[22]   5.50% [15],[16],[22]   3.50% [12],[13],[18],[33] 5.50% [15],[16],[22] 5.50% [15],[16],[22] 3.50% [12],[13],[18],[33] 3.50% [12],[13],[18],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 237                    
Fair value, ending balance $ 193 [15],[16],[22]   193 [15],[16],[22]   $ 237 [12],[13],[18]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                          
Principal Amount or Par Value 3,424 [15],[16],[21],[22]   3,424 [15],[16],[21],[22]   3,616 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                          
Principal Amount or Par Value 2,888 [15],[16],[21],[22]   2,888 [15],[16],[21],[22]   2,888 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien                          
Principal Amount or Par Value [12],[17],[40]         $ 14,796                
Spread [12],[40]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     14,796                    
Fair value, ending balance [12],[40]         $ 14,796                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 769   $ 769                    
Spread [15],[16],[22] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 769   $ 769                    
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                          
Principal Amount or Par Value 1,030 [15],[16],[21],[22]   1,030 [15],[16],[21],[22]   1,799 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 1                          
Principal Amount or Par Value [15],[21],[39] $ 14,716   $ 14,716                    
Spread [15],[39] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 14,716   $ 14,716                    
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 2                          
Principal Amount or Par Value [15],[21],[39] $ 2,656   $ 2,656                    
Spread [15],[39] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 2,656   $ 2,656                    
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien                          
Principal Amount or Par Value [15],[21],[23] $ 3,527   $ 3,527                    
Spread [15],[23] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 3,527   $ 3,527                    
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 1,561   1,561                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 468   468                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
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 [12],[13],[53]     17,019                    
Fair value, ending balance 18,028 [15],[16],[54]   18,028 [15],[16],[54]   $ 17,019 [12],[13],[53]                
Investment, Identifier [Axis]: Knockout Intermediate Holdings I, Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Preferred equity dividend rate         11.75%                
Investment, Identifier [Axis]: MED Parentco, LP, Second lien 1                          
Principal Amount or Par Value [12],[17],[24]         $ 20,857                
Spread [12],[24]         8.25%     8.25% 8.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     20,119                    
Fair value, ending balance [12],[24]         $ 20,119                
Investment, Identifier [Axis]: MRI Software LLC, First Lien 1                          
Principal Amount or Par Value $ 21,542 [15],[21],[39]   $ 21,542 [15],[21],[39]   $ 21,655 [12],[17],[40]                
Spread 5.50% [15],[39]   5.50% [15],[39]   5.50% [12],[40] 5.50% [15],[39] 5.50% [15],[39] 5.50% [12],[40] 5.50% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 21,598                    
Fair value, ending balance $ 21,542 [15],[39]   21,542 [15],[39]   $ 21,598 [12],[40]                
Investment, Identifier [Axis]: MRI Software LLC, First Lien 2                          
Principal Amount or Par Value $ 7,631 [15],[16],[21]   $ 7,631 [15],[16],[21]   $ 7,670 [12],[13],[17]                
Spread 5.50% [15],[16]   5.50% [15],[16]   5.50% [12],[13] 5.50% [15],[16] 5.50% [15],[16] 5.50% [12],[13] 5.50% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 7,650                    
Fair value, ending balance $ 7,631 [15],[16]   7,631 [15],[16]   $ 7,650 [12],[13]                
Investment, Identifier [Axis]: MRI Software LLC, First Lien 3                          
Principal Amount or Par Value $ 4,545 [15],[21],[23]   $ 4,545 [15],[21],[23]   $ 4,568 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.50% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 4,557                    
Fair value, ending balance $ 4,545 [15],[23]   4,545 [15],[23]   $ 4,557 [12],[19]                
Investment, Identifier [Axis]: MRI Software LLC, First Lien 4                          
Principal Amount or Par Value $ 3,124 [15],[21],[23]   $ 3,124 [15],[21],[23]   $ 3,140 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.50% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 3,132                    
Fair value, ending balance $ 3,124 [15],[23]   3,124 [15],[23]   $ 3,132 [12],[19]                
Investment, Identifier [Axis]: MRI Software LLC, First Lien 5                          
Principal Amount or Par Value $ 797 [15],[16],[21]   $ 797 [15],[16],[21]   $ 801 [12],[13],[17]                
Spread 5.50% [15],[16]   5.50% [15],[16]   5.50% [12],[13] 5.50% [15],[16] 5.50% [15],[16] 5.50% [12],[13] 5.50% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 800                    
Fair value, ending balance $ 797 [15],[16]   797 [15],[16]   $ 800 [12],[13]                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                          
Principal Amount or Par Value 2,002 [15],[16],[21],[22]   2,002 [15],[16],[21],[22]   2,002 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (5)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (5) [12],[13],[18]                
Investment, Identifier [Axis]: Michael Baker International, LLC, First lien                          
Principal Amount or Par Value [21],[25] $ 4,916   $ 4,916                    
Spread [25] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [25] $ 4,941   $ 4,941                    
Investment, Identifier [Axis]: Model N, Inc., First lien                          
Principal Amount or Par Value [21],[23] $ 44,329   $ 44,329                    
Spread [23] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [23] $ 44,107   $ 44,107                    
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [16],[21],[22] 9,047   9,047                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[22] 0   0                    
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [16],[21],[22] 4,825   4,825                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[22] (24)   (24)                    
Investment, Identifier [Axis]: NHME Holdings Corp., Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     0                    
Fair value, ending balance 0 [15],[16]   0 [15],[16]   0 [12],[13]                
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     0                    
Fair value, ending balance 0 [15],[16]   0 [15],[16]   0 [12],[13]                
Investment, Identifier [Axis]: NM APP Canada Corp., Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[55]     7                    
Fair value, ending balance 0 [15],[56]   0 [15],[56]   7 [12],[55]                
Investment, Identifier [Axis]: NM CLFX LP, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[55]     11,731                    
Fair value, ending balance 10,544 [15],[56]   10,544 [15],[56]   11,731 [12],[55]                
Investment, Identifier [Axis]: NM GP Holdco, LLC, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[55]     1,048                    
Fair value, ending balance 1,115 [15],[56]   1,115 [15],[56]   1,048 [12],[55]                
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 [12],[55]     96,071                    
Fair value, ending balance 102,174 [15],[29],[56]   102,174 [15],[29],[56]   96,071 [12],[55]                
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[55]     9,550                    
Fair value, ending balance 9,754 [15],[56]   9,754 [15],[56]   9,550 [12],[55]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 5,012                
Spread [12],[13],[18]         6.09%     6.09% 6.09%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     4,979                    
Fair value, ending balance [12],[13],[18]         $ 4,979                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                          
Principal Amount or Par Value $ 19,259 [15],[21],[25]   $ 19,259 [15],[21],[25]   $ 19,259 [12],[17],[24]                
Spread 6.09% [15],[25]   6.09% [15],[25]   6.09% [12],[24] 6.09% [15],[25] 6.09% [15],[25] 6.09% [12],[24] 6.09% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 19,133                    
Fair value, ending balance $ 19,259 [15],[25]   19,259 [15],[25]   $ 19,133 [12],[24]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                          
Principal Amount or Par Value $ 5,012 [15],[16],[21]   $ 5,012 [15],[16],[21]   $ 4,913 [12],[17],[19]                
Spread 6.09% [15],[16]   6.09% [15],[16]   6.09% [12],[19] 6.09% [15],[16] 6.09% [15],[16] 6.09% [12],[19] 6.09% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 4,881                    
Fair value, ending balance $ 5,012 [15],[16]   5,012 [15],[16]   $ 4,881 [12],[19]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 3                          
Principal Amount or Par Value [15],[21],[23] $ 4,913   $ 4,913                    
Spread [15],[23] 6.09%   6.09%     6.09% 6.09%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 4,913   $ 4,913                    
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 [12],[13]     140,000                    
Fair value, ending balance 140,000 [15],[16],[29]   140,000 [15],[16],[29]   140,000 [12],[13]                
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 [12],[13]     112,400                    
Fair value, ending balance 112,400 [15],[16],[29]   112,400 [15],[16],[29]   112,400 [12],[13]                
Investment, Identifier [Axis]: National HME, Inc., Second lien                          
Principal Amount or Par Value 8,281 [15],[16],[21]   8,281 [15],[16],[21]   8,281 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     3,000                    
Fair value, ending balance $ 3,000 [15],[16]   $ 3,000 [15],[16]   $ 3,000 [12],[13]                
Investment, Identifier [Axis]: National HME, Inc., Second lien, Tranche A Term Loan                          
Investment, percentage of interest entitled to receive 20.00%   20.00%   20.00% 20.00% 20.00% 20.00% 20.00%        
Spread 5.00%   5.00%   5.00% 5.00% 5.00% 5.00% 5.00%        
Investment, Identifier [Axis]: National HME, Inc., Second lien, Tranche B Term Loan                          
Investment, percentage of interest entitled to receive 20.00%   20.00%   20.00% 20.00% 20.00% 20.00% 20.00%        
Spread 6.00%   6.00%   6.00% 6.00% 6.00% 6.00% 6.00%        
Investment, Identifier [Axis]: Ncontracts, LLC, First lien                          
Principal Amount or Par Value [17],[19]         $ 8,372                
Spread [19]         6.50%     6.50% 6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19]     $ 8,267                    
Fair value, ending balance [19]         $ 8,267                
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value $ 773 [15],[16],[21],[22]   773 [15],[16],[21],[22]   773 [13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [13],[18]                
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value 515 [15],[16],[21],[22]   515 [15],[16],[21],[22]   773 [13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13],[18]     (10)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (10) [13],[18]                
Investment, Identifier [Axis]: Ncontracts, LLC., First lien                          
Principal Amount or Par Value [15],[21],[23] $ 8,372   $ 8,372                    
Spread [15],[23] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 8,372   $ 8,372                    
Investment, Identifier [Axis]: Ncontracts, LLC., First lien - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 258   $ 258                    
Spread [15],[16],[22] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 258   $ 258                    
Investment, Identifier [Axis]: Nelipak Holding Company First lien 1                          
Principal Amount or Par Value 17,791   17,791                    
Investment, Identifier [Axis]: Nelipak Holding Company First lien 2                          
Principal Amount or Par Value 112   112                    
Investment, Identifier [Axis]: Nelipak Holding Company First lien 3                          
Principal Amount or Par Value 6,868   6,868                    
Investment, Identifier [Axis]: Nelipak Holding Company First lien 4                          
Principal Amount or Par Value 1,169   1,169                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Drawn 1                          
Principal Amount or Par Value [15],[16],[21],[22],[57] $ 993   $ 993                    
Spread [15],[16],[22],[57] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[57] $ 993   $ 993                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Drawn 2                          
Principal Amount or Par Value | € [15],[16],[21],[22]           € 105              
Spread [15],[16],[22] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 112   $ 112                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 3,501   3,501                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 2                          
Principal Amount or Par Value | € [15],[16],[21],[22],[57]           € 6,411              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[57] 0   0                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 3                          
Principal Amount or Par Value | € [15],[16],[21],[22],[57]           1,092              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[57] 0   0                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 4                          
Principal Amount or Par Value [15],[16],[21],[22] 1,620   1,620                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 0   $ 0                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 1                          
Principal Amount or Par Value | € [15],[16],[21],[57]           € 16,607              
Spread [15],[16],[57] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[57] $ 17,791   $ 17,791                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 2                          
Principal Amount or Par Value [15],[21],[23] $ 9,069   $ 9,069                    
Spread [15],[23] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 9,069   $ 9,069                    
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                          
Principal Amount or Par Value 42,812 [15],[23]   42,812 [15],[23]   41,731 [12],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     41,731                    
Fair value, ending balance 42,812 [15],[23]   42,812 [15],[23]   41,731 [12],[19]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                          
Principal Amount or Par Value 20,393 [15],[16]   20,393 [15],[16]   19,798 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     19,798                    
Fair value, ending balance 20,393 [15],[16]   20,393 [15],[16]   19,798 [12],[13]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                          
Principal Amount or Par Value 10,504 [15],[25]   10,504 [15],[25]   10,239 [12],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     10,239                    
Fair value, ending balance 10,504 [15],[25]   10,504 [15],[25]   10,239 [12],[24]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                          
Principal Amount or Par Value 22,404 [15],[16]   22,404 [15],[16]   21,092 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     16,874                    
Fair value, ending balance 17,923 [15],[16]   17,923 [15],[16]   16,874 [12],[13]                
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 [12],[19]     31,838                    
Fair value, ending balance 28,469 [15],[23]   28,469 [15],[23]   31,838 [12],[19]                
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 [12],[24]     7,812                    
Fair value, ending balance 6,985 [15],[25]   6,985 [15],[25]   7,812 [12],[24]                
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 [12],[13]     7,109                    
Fair value, ending balance 6,356 [15],[16]   6,356 [15],[16]   7,109 [12],[13]                
Investment, Identifier [Axis]: New Permian Holdco, Inc., Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     26,000                    
Fair value, ending balance 28,000 [15],[16]   28,000 [15],[16]   26,000 [12],[13]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                          
Principal Amount or Par Value 23,336 [15],[16]   23,336 [15],[16]   23,336 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     23,335                    
Fair value, ending balance 23,336 [15],[16]   23,336 [15],[16]   23,335 [12],[13]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                          
Principal Amount or Par Value 18,035 [15],[16],[22]   18,035 [15],[16],[22]   13,835 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     13,835                    
Fair value, ending balance 18,035 [15],[16],[22]   18,035 [15],[16],[22]   13,835 [12],[13],[18]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                          
Principal Amount or Par Value 3,860 [15],[16],[21],[22]   3,860 [15],[16],[21],[22]   8,060 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien                          
Principal Amount or Par Value [12],[17],[19]         $ 26,762                
Spread [12],[19]         7.25%     7.25% 7.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     1,421                    
Fair value, ending balance [12],[19]         $ 1,421                
Investment, Identifier [Axis]: Next Holdco, LLC, First lien                          
Principal Amount or Par Value $ 3,512 [15],[21],[23]   $ 3,512 [15],[21],[23]   $ 3,520 [12],[17],[19]                
Spread 6.00% [15],[23]   6.00% [15],[23]   6.00% [12],[19] 6.00% [15],[23] 6.00% [15],[23] 6.00% [12],[19] 6.00% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 3,494                    
Fair value, ending balance $ 3,512 [15],[23]   3,512 [15],[23]   $ 3,494 [12],[19]                
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value 903 [15],[16],[21],[22]   903 [15],[16],[21],[22]   903 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value 339 [15],[16],[21],[22]   339 [15],[16],[21],[22]   339 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (3)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (3) [12],[13],[18]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 1                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 867                
Spread [12],[13],[18]         6.75%     6.75% 6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     803                    
Fair value, ending balance [12],[13],[18]         $ 803                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 59                
Spread [12],[13],[18]         6.75%     6.75% 6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     55                    
Fair value, ending balance [12],[13],[18]         $ 55                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn                          
Principal Amount or Par Value 880 [15],[16],[21],[22]   880 [15],[16],[21],[22]   822 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (61)                    
Fair value, ending balance (62) [15],[16],[22]   (62) [15],[16],[22]   (61) [12],[13],[18]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                          
Principal Amount or Par Value $ 9,961 [15],[21],[25]   $ 9,961 [15],[21],[25]   $ 9,950 [12],[17],[24]                
Spread 4.75% [15],[25],[30]   4.75% [15],[25],[30]   6.75% [12],[24] 4.75% [15],[25],[30] 4.75% [15],[25],[30] 6.75% [12],[24] 6.75% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 9,215                    
Fair value, ending balance $ 9,265 [15],[25]   9,265 [15],[25]   $ 9,215 [12],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                          
Principal Amount or Par Value $ 9,836 [15],[21],[25]   $ 9,836 [15],[21],[25]   $ 9,825 [12],[17],[24]                
Spread 4.75% [15],[25],[30]   4.75% [15],[25],[30]   6.75% [12],[24] 4.75% [15],[25],[30] 4.75% [15],[25],[30] 6.75% [12],[24] 6.75% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 9,100                    
Fair value, ending balance $ 9,149 [15],[25]   9,149 [15],[25]   $ 9,100 [12],[24]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 3                          
Principal Amount or Par Value [15],[16],[21] $ 868   $ 868                    
Spread [15],[16],[30] 4.75%   4.75%     4.75% 4.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 807   $ 807                    
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 - Drawn                          
Principal Amount or Par Value [15],[16],[21],[22] $ 300   $ 300                    
Spread [15],[16],[22] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 300   $ 300                    
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                          
Principal Amount or Par Value 3,300 [15],[16],[21],[22]   3,300 [15],[16],[21],[22]   3,600 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                          
Principal Amount or Par Value $ 31,592 [15],[21],[23]   $ 31,592 [15],[21],[23]   $ 27,707 [12],[17],[19]                
Spread 5.25% [15],[23]   5.25% [15],[23]   5.50% [12],[19] 5.25% [15],[23] 5.25% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 27,707                    
Fair value, ending balance $ 31,592 [15],[23]   31,592 [15],[23]   $ 27,707 [12],[19]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                          
Principal Amount or Par Value $ 27,566 [15],[21],[23]   $ 27,566 [15],[21],[23]   $ 1,754 [12],[17],[19]                
Spread 5.25% [15],[23]   5.25% [15],[23]   5.50% [12],[19] 5.25% [15],[23] 5.25% [15],[23] 5.50% [12],[19] 5.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 1,754                    
Fair value, ending balance $ 27,567 [15],[23]   27,567 [15],[23]   $ 1,754 [12],[19]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 3                          
Principal Amount or Par Value [15],[21],[23] $ 1,745   $ 1,745                    
Spread [15],[23] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 1,745   $ 1,745                    
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[58]     3,343                    
Fair value, ending balance 5,329 [15],[16],[59]   5,329 [15],[16],[59]   3,343 [12],[13],[58]                
Investment, Identifier [Axis]: OEC Holdco, LLC, Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[60],[61]     8,115                    
Fair value, ending balance [12],[60],[61]         $ 8,115                
Preferred equity dividend rate         11.00%                
Investment, Identifier [Axis]: OEConnection LL, First lien                          
Principal Amount or Par Value [15],[21],[23] $ 46,663   $ 46,663                    
Spread [15],[23] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 46,663   $ 46,663                    
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [15],[16],[21],[22] 8,101   8,101                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 5,063   5,063                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: OEConnection LLC, Second lien                          
Number of investments held | investment         2     2 2        
Investment, Identifier [Axis]: OEConnection LLC, Second lien 1                          
Principal Amount or Par Value [12],[17],[19]         $ 23,406                
Spread [12],[19]         7.00%     7.00% 7.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     23,406                    
Fair value, ending balance [12],[19]         $ 23,406                
Investment, Identifier [Axis]: OEConnection LLC, Second lien 2                          
Principal Amount or Par Value [12],[17],[19]         $ 12,044                
Spread [12],[19]         7.00%     7.00% 7.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     12,044                    
Fair value, ending balance [12],[19]         $ 12,044                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                          
Principal Amount or Par Value 1,860 [15],[16],[21],[22]   1,860 [15],[16],[21],[22]   1,860 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 1                          
Principal Amount or Par Value $ 7,440 [15],[21],[25]   $ 7,440 [15],[21],[25]   $ 7,440 [12],[17],[24]                
Spread 7.50% [15],[25]   7.50% [15],[25]   7.50% [12],[24] 7.50% [15],[25] 7.50% [15],[25] 7.50% [12],[24] 7.50% [12],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 7,440                    
Fair value, ending balance $ 7,440 [15],[25]   7,440 [15],[25]   $ 7,440 [12],[24]                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 2                          
Principal Amount or Par Value $ 7,440 [15],[21],[23]   $ 7,440 [15],[21],[23]   $ 7,440 [12],[17],[19]                
Spread 7.50% [15],[23]   7.50% [15],[23]   7.50% [12],[19] 7.50% [15],[23] 7.50% [15],[23] 7.50% [12],[19] 7.50% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 7,440                    
Fair value, ending balance $ 7,440 [15],[23]   7,440 [15],[23]   $ 7,440 [12],[19]                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 3                          
Principal Amount or Par Value [21],[25] $ 5,454   $ 5,454                    
Spread [25] 7.25%   7.25%     7.25% 7.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [25] $ 5,399   $ 5,399                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien                          
Principal Amount or Par Value [15],[21],[26] $ 16,300   $ 16,300                    
Spread [15],[26] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[26] $ 16,300   $ 16,300                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Drawn                          
Principal Amount or Par Value [15],[21],[22],[26] $ 1,952   $ 1,952                    
Spread [15],[22],[26] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[22],[26] $ 1,952   $ 1,952                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [15],[21],[22],[26] 4,225   4,225                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[22],[26] 0   0                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [15],[16],[21],[22] 1,830   1,830                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien                          
Principal Amount or Par Value [12],[17],[20]         $ 7,514                
Spread [12],[20]         5.75%     5.75% 5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     7,514                    
Fair value, ending balance [12],[20]         $ 7,514                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 2                          
Principal Amount or Par Value [15],[21],[23] $ 8,300   $ 8,300                    
Spread [15],[23] 5.75%   5.75%     5.75% 5.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 8,300   $ 8,300                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                          
Principal Amount or Par Value 486 [15],[16],[21],[22]   486 [15],[16],[21],[22]   486 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 1                          
Principal Amount or Par Value [15],[21],[26] $ 22,500   $ 22,500                    
Spread [15],[26] 5.75%   5.75%     5.75% 5.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[26] $ 22,500   $ 22,500                    
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                          
Principal Amount or Par Value                         $ 20,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance     7,975                    
Fair value, ending balance 6,525   6,525   7,975                
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                          
Principal Amount or Par Value $ 14,500 [15],[16],[21]   $ 14,500 [15],[16],[21]   $ 14,500 [12],[13],[17]                
Spread 0.00% [15],[16]   0.00% [15],[16]   0.00% [12],[13] 0.00% [15],[16] 0.00% [15],[16] 0.00% [12],[13] 0.00% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 7,975                    
Fair value, ending balance $ 6,525 [15],[16]   6,525 [15],[16]   $ 7,975 [12],[13]                
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                          
Principal Amount or Par Value $ 0 [21],[31],[62]   $ 0 [21],[31],[62]   $ 0 [17],[32],[63]                
Spread 0.00% [31],[62]   0.00% [31],[62]   0.00% [32],[63] 0.00% [31],[62] 0.00% [31],[62] 0.00% [32],[63] 0.00% [32],[63]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [32],[63]     $ 0                    
Fair value, ending balance $ 0 [31],[62]   0 [31],[62]   $ 0 [32],[63]                
Investment, Identifier [Axis]: Permian Trust, First lien                          
Principal Amount or Par Value [15],[16] 3,409   3,409                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 0   0                    
Investment, Identifier [Axis]: Permian Trust, First lien 1                          
Principal Amount or Par Value [12],[17],[64]         247                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[64]     0                    
Fair value, ending balance [12],[64]         0                
Investment, Identifier [Axis]: Permian Trust, First lien 2                          
Principal Amount or Par Value [12],[13],[17]         3,409                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     0                    
Fair value, ending balance [12],[13]         0                
Investment, Identifier [Axis]: Permian Trust, Trust Claim                          
Principal Amount or Par Value [15],[65] 247   247                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[65] 0   0                    
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien                          
Principal Amount or Par Value $ 28,288 [15],[21],[23]   $ 28,288 [15],[21],[23]   $ 28,430 [17],[19]                
Spread 6.00% [15],[23]   6.00% [15],[23]   6.00% [19] 6.00% [15],[23] 6.00% [15],[23] 6.00% [19] 6.00% [19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19]     $ 28,439                    
Fair value, ending balance $ 28,288 [15],[23]   28,288 [15],[23]   $ 28,439 [19]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value 3,708 [15],[16],[21],[22]   3,708 [15],[16],[21],[22]   3,708 [13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13],[18]     1                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   1 [13],[18]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value 3,708 [15],[16],[21],[22]   3,708 [15],[16],[21],[22]   3,708 [13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13],[18]     0                    
Fair value, ending balance $ 0 [15],[16],[22]   $ 0 [15],[16],[22]   0 [13],[18]                
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 [12],[13],[17],[18],[66]         2,446                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18],[66]     $ 0                    
Fair value, ending balance [12],[13],[18],[66]         0                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                          
Principal Amount or Par Value $ 17,321 [15],[21],[25]   $ 17,321 [15],[21],[25]   16,802 [12],[17],[24]                
Spread [15],[25] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 16,802                    
Fair value, ending balance $ 17,321 [15],[25]   17,321 [15],[25]   16,802 [12],[24]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                          
Principal Amount or Par Value $ 5,768 [15],[16],[21]   $ 5,768 [15],[16],[21]   2,303 [12],[17],[24]                
Spread [15],[16] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 2,303                    
Fair value, ending balance $ 5,768 [15],[16]   5,768 [15],[16]   2,303 [12],[24]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 3                          
Principal Amount or Par Value [15],[21],[25] $ 2,374   $ 2,374                    
Spread [15],[25] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 2,374   $ 2,374                    
Investment, Identifier [Axis]: Pioneer Buyer I, LLC., First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22],[67] 3,284   3,284                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22],[67] (13)   (13)                    
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 [66]     1,796                    
Fair value, ending balance 2,040 [15],[67],[68]   2,040 [15],[67],[68]   1,796 [66]                
Investment, Identifier [Axis]: Planview Parent, Inc., Second lien                          
Principal Amount or Par Value [21],[23] $ 9,231   $ 9,231                    
Spread [23] 6.00%   6.00%     6.00% 6.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [23] $ 9,208   $ 9,208                    
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien                          
Principal Amount or Par Value $ 18,148 [15],[21],[26]   $ 18,148 [15],[21],[26]   $ 18,193 [12],[17],[20]                
Spread 4.75% [15],[26]   4.75% [15],[26]   4.75% [12],[20] 4.75% [15],[26] 4.75% [15],[26] 4.75% [12],[20] 4.75% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 18,011                    
Fair value, ending balance $ 17,966 [15],[26]   17,966 [15],[26]   $ 18,011 [12],[20]                
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 214                
Spread [12],[13],[18]         4.75%     4.75% 4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     212                    
Fair value, ending balance [12],[13],[18]         $ 212                
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Undrawn                          
Principal Amount or Par Value 4,289 [15],[16],[21],[22]   4,289 [15],[16],[21],[22]   4,075 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (41)                    
Fair value, ending balance (43) [15],[16],[22]   (43) [15],[16],[22]   (41) [12],[13],[18]                
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien                          
Principal Amount or Par Value [15],[21],[39] $ 10,572   $ 10,572                    
Spread [15],[39] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 10,572   $ 10,572                    
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 1,510   1,510                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Project Essential Super Parent, Inc., Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     12,382                    
Fair value, ending balance 13,933 [15],[16]   13,933 [15],[16]   12,382 [12],[13]                
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien                          
Principal Amount or Par Value $ 3,535 [15],[21],[23]   $ 3,535 [15],[21],[23]   $ 3,553 [12],[17],[19]                
Spread 7.00% [15],[23]   7.00% [15],[23]   7.00% [12],[19] 7.00% [15],[23] 7.00% [15],[23] 7.00% [12],[19] 7.00% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 3,553                    
Fair value, ending balance $ 3,535 [15],[23]   3,535 [15],[23]   $ 3,553 [12],[19]                
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien - Undrawn                          
Principal Amount or Par Value 184 [15],[16],[21],[22]   184 [15],[16],[21],[22]   184 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien                          
Principal Amount or Par Value [12],[17],[19]         $ 5,109                
Spread [12],[19]         5.50%     5.50% 5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     5,109                    
Fair value, ending balance [12],[19]         $ 5,109                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         1,161                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Quartz Holding Company, Second lien                          
Principal Amount or Par Value [12],[13],[17]         $ 10,000                
Spread [12],[13]         8.00%     8.00% 8.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     10,000                    
Fair value, ending balance [12],[13]         $ 10,000                
Investment, Identifier [Axis]: RLG Holdings, LLC., First lien                          
Principal Amount or Par Value [21],[23] $ 3,990   $ 3,990                    
Spread [23] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [23] $ 3,990   $ 3,990                    
Investment, Identifier [Axis]: RealPage, Inc., Second lien                          
Principal Amount or Par Value [21],[23] $ 41,887   $ 41,887                    
Spread [23] 6.50%   6.50%     6.50% 6.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [23] $ 40,944   $ 40,944                    
Investment, Identifier [Axis]: Recorded Future, Inc., First lien                          
Principal Amount or Par Value [16],[21] $ 41,688   $ 41,688                    
Spread [16] 5.75%   5.75%     5.75% 5.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16] $ 41,480   $ 41,480                    
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                          
Principal Amount or Par Value [12],[13],[17],[18]         2,981                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value [16],[21],[22] 4,531   4,531                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[22] (23)   (23)                    
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value [16],[21],[22] 9,667   9,667                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [16],[22] (48)   (48)                    
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 1                          
Principal Amount or Par Value [12],[17],[24]         $ 24,220                
Spread [12],[24]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     24,220                    
Fair value, ending balance [12],[24]         $ 24,220                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 2                          
Principal Amount or Par Value [12],[17],[19]         $ 12,524                
Spread [12],[19]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     12,524                    
Fair value, ending balance [12],[19]         $ 12,524                
Investment, Identifier [Axis]: Reorganized Careismatic Brands Buyer, LLC., Trust Claim 1                          
Principal Amount or Par Value [15],[21],[23] $ 152   $ 152                    
Spread [15],[23] 0.00%   0.00%     0.00% 0.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 152   $ 152                    
Investment, Identifier [Axis]: Reorganized Careismatic Brands Buyer, LLC., Trust Claim 2                          
Principal Amount or Par Value [15],[16],[21] $ 52   $ 52                    
Spread [15],[16] 0.00%   0.00%     0.00% 0.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 52   $ 52                    
Investment, Identifier [Axis]: Reorganized Careismatic Brands Buyer, LLC., Warrants 1                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] 327   327                    
Investment, Identifier [Axis]: Reorganized Careismatic Brands Buyer, LLC., Warrants 2                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 112   112                    
Investment, Identifier [Axis]: Riskonnect Parent, LLC, First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 6,349   6,349                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien                          
Principal Amount or Par Value [12],[17],[19]         $ 6,904                
Spread [12],[19]         5.25%     5.25% 5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     6,904                    
Fair value, ending balance [12],[19]         $ 6,904                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                          
Principal Amount or Par Value $ 179 [15],[16],[21],[22]   $ 179 [15],[16],[21],[22]   $ 384 [12],[13],[17],[18]                
Spread 4.25% [15],[16],[22]   4.25% [15],[16],[22]   4.25% [12],[13],[18] 4.25% [15],[16],[22] 4.25% [15],[16],[22] 4.25% [12],[13],[18] 4.25% [12],[13],[18]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 384                    
Fair value, ending balance $ 179 [15],[16],[22]   179 [15],[16],[22]   $ 384 [12],[13],[18]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                          
Principal Amount or Par Value 333 [15],[16],[21],[22]   333 [15],[16],[21],[22]   128 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 1                          
Principal Amount or Par Value [15],[21],[23] $ 7,503   $ 7,503                    
Spread [15],[23] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 7,503   $ 7,503                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 2                          
Principal Amount or Par Value [15],[21],[25] $ 1,535   $ 1,535                    
Spread [15],[25] 5.25%   5.25%     5.25% 5.25%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 1,535   $ 1,535                    
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien                          
Principal Amount or Par Value $ 38,740 [15],[16],[21]   $ 38,740 [15],[16],[21]   $ 23,780 [13],[17]                
Spread 4.25% [15],[16],[30]   4.25% [15],[16],[30]   2.50% [13],[33] 4.25% [15],[16],[30] 4.25% [15],[16],[30] 2.50% [13],[33] 2.50% [13],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13]     $ 22,055                    
Fair value, ending balance $ 37,295 [15],[16]   37,295 [15],[16]   $ 22,055 [13]                
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 [12],[13]     1,799                    
Fair value, ending balance 1,799 [15],[23]   1,799 [15],[23]   1,799 [12],[13]                
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 [12],[13]     201                    
Fair value, ending balance 201 [15],[16]   201 [15],[16]   201 [12],[13]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn                          
Principal Amount or Par Value $ 212 [15],[16],[21],[22]   $ 212 [15],[16],[21],[22]   $ 78 [12],[13],[17],[18]                
Spread 4.00% [15],[16],[22]   4.00% [15],[16],[22]   4.00% [12],[13],[18] 4.00% [15],[16],[22] 4.00% [15],[16],[22] 4.00% [12],[13],[18] 4.00% [12],[13],[18]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 76                    
Fair value, ending balance $ 206 [15],[16],[22]   206 [15],[16],[22]   $ 76 [12],[13],[18]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn                          
Principal Amount or Par Value 347 [15],[16],[21],[22]   347 [15],[16],[21],[22]   481 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (17)                    
Fair value, ending balance (11) [15],[16],[22]   (11) [15],[16],[22]   (17) [12],[13],[18]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 1                          
Principal Amount or Par Value $ 10,300 [15],[21],[23]   $ 10,300 [15],[21],[23]   $ 10,352 [12],[17],[19]                
Spread 5.75% [15],[23]   5.75% [15],[23]   5.75% [12],[19] 5.75% [15],[23] 5.75% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 9,938                    
Fair value, ending balance $ 9,975 [15],[23]   9,975 [15],[23]   $ 9,938 [12],[19]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 2                          
Principal Amount or Par Value $ 77 [15],[16],[21]   $ 77 [15],[16],[21]   $ 78 [12],[13],[17]                
Spread 5.75% [15],[16]   5.75% [15],[16]   5.75% [12],[13] 5.75% [15],[16] 5.75% [15],[16] 5.75% [12],[13] 5.75% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 76                    
Fair value, ending balance $ 75 [15],[16]   75 [15],[16]   $ 76 [12],[13]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn                          
Principal Amount or Par Value [12],[13],[17],[18]         $ 112                
Spread [12],[13],[18]         5.75%     5.75% 5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     110                    
Fair value, ending balance [12],[13],[18]         $ 110                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn                          
Principal Amount or Par Value 559 [15],[16],[21],[22]   559 [15],[16],[21],[22]   447 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (8)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (8) [12],[13],[18]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien 1                          
Principal Amount or Par Value $ 3,925 [15],[21],[23]   $ 3,925 [15],[21],[23]   $ 3,945 [12],[17],[19]                
Spread 5.75% [15],[23]   5.75% [15],[23]   5.75% [12],[19] 5.75% [15],[23] 5.75% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 3,878                    
Fair value, ending balance $ 3,925 [15],[23]   3,925 [15],[23]   $ 3,878 [12],[19]                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien 2                          
Principal Amount or Par Value $ 2,774 [15],[21],[23]   $ 2,774 [15],[21],[23]   $ 2,788 [12],[17],[19]                
Spread 5.75% [15],[23]   5.75% [15],[23]   5.75% [12],[19] 5.75% [15],[23] 5.75% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 2,740                    
Fair value, ending balance $ 2,774 [15],[23]   2,774 [15],[23]   $ 2,740 [12],[19]                
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 [12],[20]     13,807                    
Fair value, ending balance 15,260 [15],[26]   15,260 [15],[26]   13,807 [12],[20]                
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 [12],[13]     4,759                    
Fair value, ending balance 5,261 [15],[16]   5,261 [15],[16]   4,759 [12],[13]                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                          
Principal Amount or Par Value $ 22,500 [15],[21],[26]   $ 22,500 [15],[21],[26]   $ 22,500 [12],[17],[20]                
Spread 8.00% [15],[26]   8.00% [15],[26]   8.00% [12],[20] 8.00% [15],[26] 8.00% [15],[26] 8.00% [12],[20] 8.00% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 22,500                    
Fair value, ending balance $ 22,500 [15],[26]   22,500 [15],[26]   $ 22,500 [12],[20]                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                          
Principal Amount or Par Value $ 5,697 [15],[21],[23]   $ 5,697 [15],[21],[23]   $ 5,697 [12],[17],[19]                
Spread 8.00% [15],[23]   8.00% [15],[23]   8.00% [12],[19] 8.00% [15],[23] 8.00% [15],[23] 8.00% [12],[19] 8.00% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 5,697                    
Fair value, ending balance $ 5,697 [15],[23]   5,697 [15],[23]   $ 5,697 [12],[19]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                          
Principal Amount or Par Value 11,681 [15],[21],[23]   11,681 [15],[21],[23]   $ 16,227 [12],[17],[19]                
Spread [12],[19]         3.50%     3.50% 3.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     9,736                    
Fair value, ending balance 10,069 [15],[23]   10,069 [15],[23]   $ 9,736 [12],[19]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                          
Principal Amount or Par Value 9,405 [15],[21],[25]   9,405 [15],[21],[25]   $ 15,651 [12],[17],[24]                
Spread [12],[24]         3.50%     3.50% 3.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     9,392                    
Fair value, ending balance 8,106 [15],[25]   8,106 [15],[25]   $ 9,392 [12],[24]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 3                          
Principal Amount or Par Value $ 2,814 [15],[16],[21]   $ 2,814 [15],[16],[21]   $ 1,033 [17],[19]                
Spread 2.00% [15],[16],[30]   2.00% [15],[16],[30]   9.50% [19] 2.00% [15],[16],[30] 2.00% [15],[16],[30] 9.50% [19] 9.50% [19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [19]     $ 1,033                    
Fair value, ending balance $ 2,378 [15],[16]   2,378 [15],[16]   $ 1,033 [19]                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 4                          
Principal Amount or Par Value [17],[24]         $ 996                
Spread [24]         9.50%     9.50% 9.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [24]     996                    
Fair value, ending balance [24]         $ 996                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 1                          
Principal Amount or Par Value [15],[21],[23] 286   286                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] 286   286                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 2                          
Principal Amount or Par Value [15],[21],[25] 276   276                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] 276   276                    
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC), Second lien                          
Principal Amount or Par Value [12],[17],[19]         $ 7,950                
Spread [12],[19]         6.75%     6.75% 6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     7,711                    
Fair value, ending balance [12],[19]         $ 7,711                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     95,151                    
Fair value, ending balance 69,708 [15],[16]   69,708 [15],[16]   $ 95,151 [12],[13]                
Ordinary shares dividend rate         12.00%                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Preferred shares                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] 7,084   7,084                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien                          
Principal Amount or Par Value         $ 16,600                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                          
Principal Amount or Par Value $ 16,698   $ 16,698       £ 13,205 [15],[16],[21],[57]   £ 13,039 [12],[13],[17],[69]        
Spread 5.00% [15],[16],[30],[57]   5.00% [15],[16],[30],[57]   5.00% [12],[13],[33],[69] 5.00% [15],[16],[30],[57] 5.00% [15],[16],[30],[57] 5.00% [12],[13],[33],[69] 5.00% [12],[13],[33],[69]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[69]     $ 16,600                    
Fair value, ending balance $ 16,699 [15],[16],[57]   $ 16,699 [15],[16],[57]   $ 16,600 [12],[13],[69]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                          
Principal Amount or Par Value | £             £ 10,870 [15],[16],[21],[57]   £ 10,734 [12],[13],[17],[69]        
Spread 5.00% [15],[16],[30],[57]   5.00% [15],[16],[30],[57]   5.00% [12],[13],[33],[69] 5.00% [15],[16],[30],[57] 5.00% [15],[16],[30],[57] 5.00% [12],[13],[33],[69] 5.00% [12],[13],[33],[69]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[69]     $ 13,664                    
Fair value, ending balance $ 13,741 [15],[16],[57]   13,741 [15],[16],[57]   $ 13,664 [12],[13],[69]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2 and Tennessee Bidco Limited, First lien 5                          
Principal Amount or Par Value 14,522   14,522   14,457                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                          
Principal Amount or Par Value $ 10,446 [15],[16],[21]   $ 10,446 [15],[16],[21]   $ 10,312 [12],[13],[17]                
Spread 5.00% [15],[16],[30]   5.00% [15],[16],[30]   5.00% [12],[13],[33] 5.00% [15],[16],[30] 5.00% [15],[16],[30] 5.00% [12],[13],[33] 5.00% [12],[13],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 10,312                    
Fair value, ending balance $ 10,446 [15],[16]   10,446 [15],[16]   $ 10,312 [12],[13]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                          
Principal Amount or Par Value $ 6,454 [15],[16],[21]   $ 6,454 [15],[16],[21]   $ 6,373 [12],[13],[17]                
Spread 5.00% [15],[16],[30]   5.00% [15],[16],[30]   5.00% [12],[13],[33] 5.00% [15],[16],[30] 5.00% [15],[16],[30] 5.00% [12],[13],[33] 5.00% [12],[13],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 6,373                    
Fair value, ending balance $ 6,454 [15],[16]   $ 6,454 [15],[16]   $ 6,373 [12],[13]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                          
Principal Amount or Par Value | €           € 726 [15],[16],[21],[57]   € 716 [12],[13],[17],[69]          
Spread 5.00% [15],[16],[30],[57]   5.00% [15],[16],[30],[57]   5.00% [12],[13],[33],[69] 5.00% [15],[16],[30],[57] 5.00% [15],[16],[30],[57] 5.00% [12],[13],[33],[69] 5.00% [12],[13],[33],[69]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[69]     $ 791                    
Fair value, ending balance $ 777 [15],[16],[57]   777 [15],[16],[57]   $ 791 [12],[13],[69]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                          
Principal Amount or Par Value $ 29,868 [15],[21],[23]   $ 29,868 [15],[21],[23]   $ 29,868 [12],[17],[24]                
Spread 3.38% [15],[23],[30]   3.38% [15],[23],[30]   3.38% [12],[24],[33] 3.38% [15],[23],[30] 3.38% [15],[23],[30] 3.38% [12],[24],[33] 3.38% [12],[24],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 29,614                    
Fair value, ending balance $ 29,868 [15],[23]   29,868 [15],[23]   $ 29,614 [12],[24]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                          
Principal Amount or Par Value $ 1,889 [15],[21],[22],[23]   $ 1,889 [15],[21],[22],[23]   $ 1,354 [12],[17],[18],[19]                
Spread 3.38% [15],[22],[23],[30]   3.38% [15],[22],[23],[30]   3.38% [12],[18],[19],[33] 3.38% [15],[22],[23],[30] 3.38% [15],[22],[23],[30] 3.38% [12],[18],[19],[33] 3.38% [12],[18],[19],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     $ 1,343                    
Fair value, ending balance $ 1,889 [15],[22],[23]   1,889 [15],[22],[23]   $ 1,343 [12],[18],[19]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value 350 [15],[21],[22],[23]   350 [15],[21],[22],[23]   885 [12],[17],[18],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     (8)                    
Fair value, ending balance 0 [15],[22],[23]   0 [15],[22],[23]   (8) [12],[18],[19]                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value 4,267 [15],[16],[21],[22]   4,267 [15],[16],[21],[22]   4,267 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     (36)                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   (36) [12],[13],[18]                
Investment, Identifier [Axis]: Transcendia Holdings, Inc., Second lien                          
Principal Amount or Par Value [12],[17],[24]         $ 14,500                
Spread [12],[24]         8.00%     8.00% 8.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     7,250                    
Fair value, ending balance [12],[24]         $ 7,250                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien                          
Principal Amount or Par Value $ 15,382 [15],[21],[23]   $ 15,382 [15],[21],[23]   $ 15,382 [12],[17],[19]                
Spread 5.25% [15],[23]   5.25% [15],[23]   5.75% [12],[19] 5.25% [15],[23] 5.25% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 15,382                    
Fair value, ending balance $ 15,382 [15],[23]   15,382 [15],[23]   $ 15,382 [12],[19]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                          
Principal Amount or Par Value $ 4,295 [15],[21],[22],[23]   $ 4,295 [15],[21],[22],[23]   $ 4,070 [12],[17],[18],[19]                
Spread 5.25% [15],[22],[23]   5.25% [15],[22],[23]   5.75% [12],[18],[19] 5.25% [15],[22],[23] 5.25% [15],[22],[23] 5.75% [12],[18],[19] 5.75% [12],[18],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     $ 4,070                    
Fair value, ending balance $ 4,295 [15],[22],[23]   4,295 [15],[22],[23]   $ 4,070 [12],[18],[19]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                          
Principal Amount or Par Value 958 [15],[21],[22],[23]   958 [15],[21],[22],[23]   1,182 [12],[17],[18],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     0                    
Fair value, ending balance 0 [15],[22],[23]   0 [15],[22],[23]   0 [12],[18],[19]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                          
Principal Amount or Par Value 1,501 [15],[16],[21],[22]   1,501 [15],[16],[21],[22]   1,501 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                          
Principal Amount or Par Value 893 [15],[16],[21],[22]   893 [15],[16],[21],[22]   893 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                          
Principal Amount or Par Value $ 5,584 [15],[21],[23]   $ 5,584 [15],[21],[23]   $ 11,226 [12],[17],[19]                
Spread 5.75% [15],[23]   5.75% [15],[23]   5.75% [12],[19] 5.75% [15],[23] 5.75% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 11,226                    
Fair value, ending balance $ 5,584 [15],[23]   5,584 [15],[23]   $ 11,226 [12],[19]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                          
Principal Amount or Par Value $ 5,584 [15],[21],[25]   $ 5,584 [15],[21],[25]   $ 1,462 [12],[13],[17]                
Spread 5.75% [15],[25]   5.75% [15],[25]   5.75% [12],[13] 5.75% [15],[25] 5.75% [15],[25] 5.75% [12],[13] 5.75% [12],[13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     $ 1,462                    
Fair value, ending balance $ 5,584 [15],[25]   5,584 [15],[25]   $ 1,462 [12],[13]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 3                          
Principal Amount or Par Value [15],[16],[21] $ 1,454   $ 1,454                    
Spread [15],[16] 5.75%   5.75%     5.75% 5.75%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16] $ 1,454   $ 1,454                    
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 [12],[13]     0                    
Fair value, ending balance 0 [15],[23]   0 [15],[23]   0 [12],[13]                
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 [12],[13]     0                    
Fair value, ending balance 0 [15],[16]   0 [15],[16]   0 [12],[13]                
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 [12],[13]     16,348                    
Fair value, ending balance 18,482 [15],[16]   18,482 [15],[16]   16,348 [12],[13]                
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 [12],[13]     10,119                    
Fair value, ending balance 11,375 [15],[16]   11,375 [15],[16]   10,119 [12],[13]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 3                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[32]     4,210                    
Fair value, ending balance 4,599 [15],[16]   4,599 [15],[16]   4,210 [12],[13],[32]                
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 [12],[32]     0                    
Fair value, ending balance 0 [15],[23]   0 [15],[23]   0 [12],[32]                
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 [12],[13],[32]     0                    
Fair value, ending balance 0 [15],[16]   0 [15],[16]   0 [12],[13],[32]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                          
Principal Amount or Par Value 14,477 [15],[16],[21]   14,477 [15],[16],[21]   13,438 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     12,893                    
Fair value, ending balance 14,401 [15],[16]   14,401 [15],[16]   12,893 [12],[13]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                          
Principal Amount or Par Value 6,418 [15],[16],[21]   6,418 [15],[16],[21]   5,957 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     5,713                    
Fair value, ending balance 6,384 [15],[16]   6,384 [15],[16]   5,713 [12],[13]                
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 4,599   4,599                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Warrants                          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     42,716                    
Fair value, ending balance 46,323 [15],[16]   46,323 [15],[16]   42,716 [12],[13]                
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                          
Principal Amount or Par Value $ 11,001 [16],[21]   $ 11,001 [16],[21]   $ 9,401 [13],[17]                
Spread 7.13% [16]   7.13% [16]   7.13% [13] 7.13% [16] 7.13% [16] 7.13% [13] 7.13% [13]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [13]     $ 8,077                    
Fair value, ending balance $ 10,135 [16]   10,135 [16]   $ 8,077 [13]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn                          
Principal Amount or Par Value [12],[17],[18],[19]         $ 13,336                
Spread [12],[18],[19]         5.75%     5.75% 5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     13,336                    
Fair value, ending balance [12],[18],[19]         $ 13,336                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn                          
Principal Amount or Par Value [15],[16],[21],[22] 2,040   2,040                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                          
Principal Amount or Par Value [12],[17],[18],[19]         2,396                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     0                    
Fair value, ending balance [12],[18],[19]         0                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                          
Principal Amount or Par Value [12],[13],[17],[18]         2,040                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance [12],[13],[18]         0                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                          
Principal Amount or Par Value $ 15,670 [15],[21],[23]   $ 15,670 [15],[21],[23]   $ 18,758 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.75% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 18,758                    
Fair value, ending balance $ 15,670 [15],[23]   15,670 [15],[23]   $ 18,758 [12],[19]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                          
Principal Amount or Par Value $ 11,969 [15],[21],[25]   $ 11,969 [15],[21],[25]   $ 1,241 [12],[17],[19]                
Spread 5.50% [15],[25]   5.50% [15],[25]   5.75% [12],[19] 5.50% [15],[25] 5.50% [15],[25] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 1,241                    
Fair value, ending balance $ 11,969 [15],[25]   11,969 [15],[25]   $ 1,241 [12],[19]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                          
Principal Amount or Par Value $ 6,693 [15],[21],[23]   $ 6,693 [15],[21],[23]   $ 832 [12],[17],[19]                
Spread 5.50% [15],[23]   5.50% [15],[23]   5.75% [12],[19] 5.50% [15],[23] 5.50% [15],[23] 5.75% [12],[19] 5.75% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 832                    
Fair value, ending balance $ 6,693 [15],[23]   6,693 [15],[23]   $ 832 [12],[19]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 4                          
Principal Amount or Par Value [15],[21],[25] $ 1,234   $ 1,234                    
Spread [15],[25] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 1,234   $ 1,234                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 5                          
Principal Amount or Par Value [15],[21],[25] $ 828   $ 828                    
Spread [15],[25] 5.50%   5.50%     5.50% 5.50%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[25] $ 828   $ 828                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subordinated                          
Principal Amount or Par Value 3,784 [15],[16],[21]   3,784 [15],[16],[21]   3,513 [12],[13],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13]     3,459                    
Fair value, ending balance 3,784 [15],[16]   3,784 [15],[16]   3,459 [12],[13]                
Investment, Identifier [Axis]: Xactly Corporation, First lien                          
Principal Amount or Par Value $ 22,500 [15],[21],[26]   $ 22,500 [15],[21],[26]   $ 22,500 [12],[17],[20]                
Spread 7.25% [15],[26]   7.25% [15],[26]   7.25% [12],[20] 7.25% [15],[26] 7.25% [15],[26] 7.25% [12],[20] 7.25% [12],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[20]     $ 22,500                    
Fair value, ending balance $ 22,500 [15],[26]   22,500 [15],[26]   $ 22,500 [12],[20]                
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                          
Principal Amount or Par Value 992 [15],[16],[21],[22]   992 [15],[16],[21],[22]   992 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[13],[18]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 1                          
Principal Amount or Par Value $ 2,096 [15],[21],[22],[23]   $ 2,096 [15],[21],[22],[23]   $ 1,204 [12],[17],[18],[40]                
Spread 5.00% [15],[22],[23]   5.00% [15],[22],[23]   5.00% [12],[18],[40] 5.00% [15],[22],[23] 5.00% [15],[22],[23] 5.00% [12],[18],[40] 5.00% [12],[18],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[40]     $ 1,204                    
Fair value, ending balance $ 2,096 [15],[22],[23]   2,096 [15],[22],[23]   $ 1,204 [12],[18],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 2                          
Principal Amount or Par Value $ 715 [15],[21],[22],[39]   $ 715 [15],[21],[22],[39]   $ 80 [12],[17],[18],[40]                
Spread 5.00% [15],[22],[39]   5.00% [15],[22],[39]   5.50% [12],[18],[40] 5.00% [15],[22],[39] 5.00% [15],[22],[39] 5.50% [12],[18],[40] 5.50% [12],[18],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[40]     $ 80                    
Fair value, ending balance $ 715 [15],[22],[39]   715 [15],[22],[39]   $ 80 [12],[18],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 3                          
Principal Amount or Par Value [15],[16],[21],[22] $ 326   $ 326                    
Spread [15],[16],[22] 4.00%   4.00%     4.00% 4.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] $ 326   $ 326                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value 150 [15],[21],[22],[39]   150 [15],[21],[22],[39]   785 [12],[17],[18],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[40]     0                    
Fair value, ending balance 0 [15],[22],[39]   0 [15],[22],[39]   0 [12],[18],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value 440 [15],[21],[22],[23]   440 [15],[21],[22],[23]   3,968 [12],[13],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     0                    
Fair value, ending balance 0 [15],[22],[23]   0 [15],[22],[23]   0 [12],[13],[18]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 3                          
Principal Amount or Par Value [15],[16],[21],[22] 5,107   5,107                    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[16],[22] 0   0                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 1                          
Principal Amount or Par Value $ 17,586 [15],[21],[39]   $ 17,586 [15],[21],[39]   $ 17,677 [12],[17],[40]                
Spread 5.00% [15],[39]   5.00% [15],[39]   5.00% [12],[40] 5.00% [15],[39] 5.00% [15],[39] 5.00% [12],[40] 5.00% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 17,676                    
Fair value, ending balance $ 17,586 [15],[39]   17,586 [15],[39]   $ 17,676 [12],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 2                          
Principal Amount or Par Value $ 8,391 [15],[21],[23]   $ 8,391 [15],[21],[23]   $ 2,302 [12],[17],[40]                
Spread 5.00% [15],[23]   5.00% [15],[23]   5.00% [12],[40] 5.00% [15],[23] 5.00% [15],[23] 5.00% [12],[40] 5.00% [12],[40]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[40]     $ 2,301                    
Fair value, ending balance $ 8,391 [15],[23]   8,391 [15],[23]   $ 2,301 [12],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 3                          
Principal Amount or Par Value [15],[21],[23] $ 3,514   $ 3,514                    
Spread [15],[23] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 3,514   $ 3,514                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 4                          
Principal Amount or Par Value [15],[21],[39] $ 2,290   $ 2,290                    
Spread [15],[39] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 2,290   $ 2,290                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 5                          
Principal Amount or Par Value [15],[21],[23] $ 1,321   $ 1,321                    
Spread [15],[23] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 1,321   $ 1,321                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 6                          
Principal Amount or Par Value [15],[21],[39] $ 1,198   $ 1,198                    
Spread [15],[39] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[39] $ 1,198   $ 1,198                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 7                          
Principal Amount or Par Value [15],[21],[23] $ 846   $ 846                    
Spread [15],[23] 5.00%   5.00%     5.00% 5.00%            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, ending balance [15],[23] $ 846   $ 846                    
Investment, Identifier [Axis]: iCIMS, Inc., First Lien - Drawn                          
Principal Amount or Par Value $ 353 [15],[16],[21],[22]   $ 353 [15],[16],[21],[22]   $ 471 [12],[13],[17],[18]                
Spread 6.75% [15],[16],[22]   6.75% [15],[16],[22]   6.75% [12],[13],[18] 6.75% [15],[16],[22] 6.75% [15],[16],[22] 6.75% [12],[13],[18] 6.75% [12],[13],[18]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 471                    
Fair value, ending balance $ 353 [15],[16],[22]   353 [15],[16],[22]   $ 471 [12],[13],[18]                
Investment, Identifier [Axis]: iCIMS, Inc., First Lien 1                          
Principal Amount or Par Value $ 44,118 [15],[21]   $ 44,118 [15],[21]   $ 30,783 [12],[17],[24]                
Spread 3.88% [15]   3.88% [15]   3.38% [12],[24],[33] 3.88% [15] 3.88% [15] 3.38% [12],[24],[33] 3.38% [12],[24],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[24]     $ 31,008                    
Fair value, ending balance $ 44,118 [15]   44,118 [15]   $ 31,008 [12],[24]                
Investment, Identifier [Axis]: iCIMS, Inc., First Lien 2                          
Principal Amount or Par Value $ 7,366 [15],[21]   $ 7,366 [15],[21]   $ 7,366 [12],[17],[19]                
Spread 7.25% [15]   7.25% [15]   7.25% [12],[19] 7.25% [15] 7.25% [15] 7.25% [12],[19] 7.25% [12],[19]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     $ 7,440                    
Fair value, ending balance $ 7,366 [15]   7,366 [15]   $ 7,440 [12],[19]                
Investment, Identifier [Axis]: iCIMS, Inc., First Lien 3                          
Principal Amount or Par Value [12],[17],[19]         $ 4,772                
Spread [12],[19],[33]         3.38%     3.38% 3.38%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[19]     4,807                    
Fair value, ending balance [12],[19]         $ 4,807                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                          
Principal Amount or Par Value 7,994 [15],[21],[22],[23]   7,994 [15],[21],[22],[23]   6,293 [12],[17],[18],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[24]     0                    
Fair value, ending balance 0 [15],[22],[23]   0 [15],[22],[23]   0 [12],[18],[24]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                          
Principal Amount or Par Value 3,177 [15],[16],[21],[22]   3,177 [15],[16],[21],[22]   976 [12],[17],[18],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[18],[19]     0                    
Fair value, ending balance $ 0 [15],[16],[22]   0 [15],[16],[22]   0 [12],[18],[19]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 3                          
Principal Amount or Par Value [12],[13],[17],[18]         2,347                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                          
Fair value, beginning balance [12],[13],[18]     $ 0                    
Fair value, ending balance [12],[13],[18]         $ 0                
[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] 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.
[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 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.
[6] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[7] Gross 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.
[8] 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.
[9] 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 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.
[11] 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.
[12] 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.
[13] 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.
[14] 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.
[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] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[18] 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.
[19] 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.
[20] Investment is held by New Mountain Finance SBIC, L.P.
[21] Par amount is denominated in U.S. Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[22] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[23] Investment is 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.
[24] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C. as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[25] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C. as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[26] Investment is held by New Mountain Finance SBIC, L.P.
[27] 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, two first lien delayed draws and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc.
[28] 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, two first lien delayed draws 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.
[29] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of June 30, 2024, 14.3% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[30] All or a portion of interest contains PIK interest. See Note 2. Summary of Significant Accounting Policies-Revenue Recognition, for details.
[31] Investment is on non-accrual status. See Note 3. Investments, for details.
[32] Investment is on non-accrual status. See Note 3. Investments, for details.
[33] All or a portion of interest contains PIK interest.
[34] Investment is held by NMF Ancora Holdings, Inc.
[35] Investment is held by NMF Ancora Holdings, Inc.
[36] The Company holds investments in two wholly-owned subsidiaries of Appriss Health Holdings, Inc. The company holds a first lien term loan and a first lien revolver in Appriss Health, LLC, and preferred equity in Appriss Health Intermediate Holdings, Inc. The preferred equity is entitled to receive preferential dividends at a rate of 11.0% per annum.
[37] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2023, 14.8% 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 Bamboo Health Intermediate Holdings, Inc.(fka Appriss Health Intermediate Holdings, Inc.) and holds a first lien term loan and a first lien revolver in Bamboo Health Holdings, LLC (fka Appriss Health, LLC), a wholly-owned subsidiary of Bamboo Health Intermediate Holdings, Inc.
[39] Investment is held by New Mountain Finance SBIC II, L.P.
[40] Investment is held by New Mountain Finance SBIC II, L.P.
[41] 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.
[42] The Company holds investments in two wholly-owned subsidiaries 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.
[43] 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.
[44] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and three first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[45] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and three first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[46] Investment is held by NMF HB, Inc.
[47] Investment is held by NMF HB, Inc.
[48] Investment is held by NMF TRM, LLC.
[49] Investment is held by NMF TRM, LLC.
[50] Investment is held by NMF QID NGL Holdings, Inc.
[51] Investment is held by NMF QID NGL Holdings, Inc.
[52] 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.
[53] 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.
[54] 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.
[55] Investment is held by New Mountain Net Lease Corporation.
[56] Investment is held by New Mountain Net Lease Corporation.
[57] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of June 30, 2024, the par value U.S. dollar equivalent of the Tennessee Bidco Limited first lien term loan and drawn first lien term loans is $16,698 and $14,522, respectively, and the Nelipak Holding Company first lien term loan, drawn revolver, undrawn first lien term loan and undrawn revolver is $17,791, $112, $6,868 and $1,169, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[58] 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.
[59] 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.
[60] Investment is held by NMF OEC, Inc.
[61] 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.
[62] 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 $13,500 as of June 30, 2024. See Note 2. Summary of Significant Accounting Policies, for details.
[63] 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 December 31, 2023. See Note 2. Summary of Significant Accounting Policies, for details.
[64] Investment is held by NMF Permian Holdings, LLC.
[65] Investment is held by NMF Permian Holdings, LLC.
[66] 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.
[67] 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.
[68] Investment is held by NMF Pioneer, Inc.
[69] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2023, the par value U.S. dollar equivalent of the first lien term loan, and drawn first lien term loan is $16,600 and $14,457, respectively. See Note 2. Summary of Significant Accounting Policies, for details.