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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
investment
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
investment
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
investment
Jun. 30, 2025
EUR (€)
investment
Dec. 31, 2024
EUR (€)
investment
Sep. 30, 2023
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
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   13,500            
Spread [1],[2],[3] 6.75%   6.75%     6.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [4]     $ 3,091,024                
Net Change In Unrealized Appreciation (Depreciation) $ (40,078) $ 30,641 (89,005) $ 33,635              
Fair value, ending balance 3,000,696 [5]   3,000,696 [5]   $ 3,091,024 [4]            
Net Realized Gains (Losses) $ 13,389 (31,166) $ 51,214 (42,993)              
Investments at fair value that are non-qualifying assets as a percentage of total assets 15.50%   15.50%   14.60% 15.50% 14.60%        
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     $ 19,156 17,873 $ 17,873            
Gross additions [6]         0            
Gross redemptions [7]         (50)            
Net Change In Unrealized Appreciation (Depreciation)         1,333            
Fair value, ending balance         19,156            
Net Realized Gains (Losses)         0            
Interest Income         1,432            
Dividend Income         0            
Other Income         0            
Sierra Hamilton Holdings Corporation                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     2,000 2,000 2,000            
Gross additions [6]         0            
Gross redemptions [7]         0            
Net Change In Unrealized Appreciation (Depreciation)         0            
Fair value, ending balance         2,000            
Net Realized Gains (Losses)         0            
Interest Income         0            
Dividend Income         0            
Other Income         0            
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     91,620 113,786 113,786            
Gross additions [6]         16,409            
Gross redemptions [7]         0            
Net Change In Unrealized Appreciation (Depreciation)         (38,575)            
Fair value, ending balance         91,620            
Net Realized Gains (Losses)         0            
Interest Income         3,659            
Dividend Income         5,843            
Other Income         250            
NMFC Senior Loan Program III LLC                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Dividend Income $ 5,600 5,775 11,400 11,638              
NMFC Senior Loan Program IV LLC                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Dividend Income 3,794 4,004 7,728 8,360              
Non-controlled/Affiliated                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     112,776 133,659 133,659            
Gross additions     4,026 [8]   16,409 [6]            
Gross redemptions     0 [9]   (50) [7]            
Net Change In Unrealized Appreciation (Depreciation)     (13,819)   (37,242)            
Fair value, ending balance 102,983   102,983   112,776            
Net Realized Gains (Losses)     0   0            
Interest Income     2,711   5,091            
Dividend Income     1,975   5,843            
Other Income 62 62 125 125 250            
Non-controlled/Affiliated | Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     19,156                
Gross additions [8]     0                
Gross redemptions [9]     0                
Net Change In Unrealized Appreciation (Depreciation)     (819)                
Fair value, ending balance 18,337   18,337   19,156            
Net Realized Gains (Losses)     0                
Interest Income     660                
Dividend Income     0                
Other Income     0                
Non-controlled/Affiliated | Sierra Hamilton Holdings Corporation                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     2,000                
Gross additions [8]     0                
Gross redemptions [9]     0                
Net Change In Unrealized Appreciation (Depreciation)     0                
Fair value, ending balance 2,000   2,000   2,000            
Net Realized Gains (Losses)     0                
Interest Income     0                
Dividend Income     0                
Other Income     0                
Non-controlled/Affiliated | TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     91,620                
Gross additions [8]     4,026                
Gross redemptions [9]     0                
Net Change In Unrealized Appreciation (Depreciation)     (13,000)                
Fair value, ending balance 82,646   82,646   91,620            
Net Realized Gains (Losses)     0                
Interest Income     2,051                
Dividend Income     1,975                
Other Income     125                
Controlled                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     700,896 667,796 667,796            
Gross additions     81,116 [10]   47,177 [11]            
Gross redemptions     (60,582) [12]   (14,413) [13]            
Net Change In Unrealized Appreciation (Depreciation)     (50,982)   336            
Fair value, ending balance 670,448   670,448   700,896            
Net Realized Gains (Losses)     38,898   2,000            
Interest Income     10,095   21,449            
Dividend Income     28,830   55,086            
Other Income 375 $ 497 2,203 1,370 3,392            
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     0 3,419 3,419            
Gross additions [11]         0            
Gross redemptions [13]         0            
Net Change In Unrealized Appreciation (Depreciation)         (3,419)            
Fair value, ending balance         0            
Net Realized Gains (Losses)         4,981            
Interest Income         0            
Dividend Income         0            
Other Income         41            
Controlled | National HME, Inc./NHME Holdings Corp.                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     3,000 3,000 3,000            
Gross additions     0 [10]   0 [11]            
Gross redemptions     0 [12]   0 [13]            
Net Change In Unrealized Appreciation (Depreciation)     0   0            
Fair value, ending balance 3,000   3,000   3,000            
Net Realized Gains (Losses)     0   0            
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     140,102 135,401 135,401            
Gross additions     10,065 [10]   10,595 [11]            
Gross redemptions     0 [12]   0 [13]            
Net Change In Unrealized Appreciation (Depreciation)     (1,717)   (5,894)            
Fair value, ending balance 148,450   148,450   140,102            
Net Realized Gains (Losses)     0   0            
Interest Income     6,816   12,934            
Dividend Income     0   0            
Other Income     1,383   375            
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     63,076 63,170 63,170            
Gross additions     4,662 [10]   7,005 [11]            
Gross redemptions     0 [12]   0 [13]            
Net Change In Unrealized Appreciation (Depreciation)     (4,901)   (7,099)            
Fair value, ending balance 62,837   62,837   63,076            
Net Realized Gains (Losses)     0   0            
Interest Income     2,763   5,382            
Dividend Income     0   0            
Other Income     250   500            
Controlled | NM APP CANADA CORP                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     0 7 7            
Gross additions [11]         0            
Gross redemptions [13]         0            
Net Change In Unrealized Appreciation (Depreciation)         (7)            
Fair value, ending balance         0            
Net Realized Gains (Losses)         31            
Interest Income         0            
Dividend Income         0            
Other Income         0            
Controlled | NM CLFX LP                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     0 11,731 11,731            
Gross additions [11]         0            
Gross redemptions [13]         (12,279)            
Net Change In Unrealized Appreciation (Depreciation)         548            
Fair value, ending balance         0            
Net Realized Gains (Losses)         (2,461)            
Interest Income         0            
Dividend Income         24            
Other Income         845            
Controlled | NM NL Holdings, L.P.                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     104,512 96,071 96,071            
Gross additions     0 [10]   0 [11]            
Gross redemptions     0 [12]   (2,123) [13]            
Net Change In Unrealized Appreciation (Depreciation)     461   10,564            
Fair value, ending balance 104,973   104,973   104,512            
Net Realized Gains (Losses)     0   (548)            
Interest Income     0   0            
Dividend Income     4,375   8,116            
Other Income     0   181            
Controlled | NM GP Holdco, LLC                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     322 1,048 1,048            
Gross additions     0 [10]   0 [11]            
Gross redemptions     0 [12]   (11) [13]            
Net Change In Unrealized Appreciation (Depreciation)     71   (715)            
Fair value, ending balance 393   393   322            
Net Realized Gains (Losses)     0   (3)            
Interest Income     0   0            
Dividend Income     22   89            
Other Income     0   0            
Controlled | NM YI LLC                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     9,960 9,550 9,550            
Gross additions     0 [10]   0 [11]            
Gross redemptions     0 [12]   0 [13]            
Net Change In Unrealized Appreciation (Depreciation)     (1,086)   410            
Fair value, ending balance 8,874   8,874   9,960            
Net Realized Gains (Losses)     0   0            
Interest Income     0   0            
Dividend Income     450   879            
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     160,000 140,000 140,000            
Gross additions     0 [10]   20,000 [11]            
Gross redemptions     0 [12]   0 [13]            
Net Change In Unrealized Appreciation (Depreciation)     0   0            
Fair value, ending balance 160,000   160,000   160,000            
Net Realized Gains (Losses)     0   0            
Interest Income     0   0            
Dividend Income     11,400   23,304            
Other Income     0   0            
Controlled | NMFC Senior Loan Program IV LLC                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     112,400 112,400 112,400            
Gross additions     0 [10]   0 [11]            
Gross redemptions     0 [12]   0 [13]            
Net Change In Unrealized Appreciation (Depreciation)     0   0            
Fair value, ending balance 112,400   112,400   112,400            
Net Realized Gains (Losses)     0   0            
Interest Income     0   0            
Dividend Income     7,728   16,228            
Other Income     0   0            
Controlled | UniTek Global Services, Inc.                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance     107,524 $ 91,999 91,999            
Gross additions     66,389 [10]   9,577 [11]            
Gross redemptions     (60,582) [12]   0 [13]            
Net Change In Unrealized Appreciation (Depreciation)     (43,810)   5,948            
Fair value, ending balance 69,521   69,521   107,524            
Net Realized Gains (Losses)     38,898   0            
Interest Income     516   3,133            
Dividend Income     4,855   6,446            
Other Income     570   1,450            
Investment, Identifier [Axis]: AAC Lender Holdings, LLC, Ordinary shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [14],[15],[16]     0                
Fair value, ending balance 0 [2],[3],[17]   0 [2],[3],[17]   0 [14],[15],[16]            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 3,659   3,659                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         3,659            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                      
Principal Amount or Par Value $ 22,618 [2],[18],[21],[22]   $ 22,618 [2],[18],[21],[22]   $ 22,733 [15],[19],[23],[24]            
Spread 5.25% [2],[21],[22]   5.25% [2],[21],[22]   5.25% [15],[23],[24] 5.25% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 22,734                
Fair value, ending balance $ 22,618 [2],[21],[22]   22,618 [2],[21],[22]   $ 22,734 [15],[23],[24]            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                      
Principal Amount or Par Value $ 20,113 [2],[3],[18],[25]   $ 20,113 [2],[3],[18],[25]   $ 20,218 [15],[16],[19],[26]            
Spread 5.25% [2],[3],[25]   5.25% [2],[3],[25]   5.25% [15],[16],[26] 5.25% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 20,218                
Fair value, ending balance $ 20,113 [2],[3],[25]   20,113 [2],[3],[25]   $ 20,218 [15],[16],[26]            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 3                      
Principal Amount or Par Value $ 9,550 [2],[18],[27]   $ 9,550 [2],[18],[27]   $ 9,599 [15],[19],[28]            
Spread 5.25% [2],[27]   5.25% [2],[27]   5.25% [15],[28] 5.25% [2],[27] 5.25% [15],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     $ 9,599                
Fair value, ending balance $ 9,550 [2],[27]   9,550 [2],[27]   $ 9,599 [15],[28]            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 4                      
Principal Amount or Par Value $ 7,338 [2],[18],[27]   $ 7,338 [2],[18],[27]   $ 7,375 [15],[19],[28]            
Spread 5.25% [2],[27]   5.25% [2],[27]   5.25% [15],[28] 5.25% [2],[27] 5.25% [15],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     $ 7,375                
Fair value, ending balance $ 7,338 [2],[27]   7,338 [2],[27]   $ 7,375 [15],[28]            
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                      
Principal Amount or Par Value 16,655 [2],[3],[18],[25]   16,655 [2],[3],[18],[25]   15,733 [15],[16],[19],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     15,366                
Fair value, ending balance 16,444 [2],[3],[25]   16,444 [2],[3],[25]   15,366 [15],[16],[26]            
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                      
Principal Amount or Par Value 6,532 [2],[18],[27]   6,532 [2],[18],[27]   6,170 [15],[19],[28]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     6,027                
Fair value, ending balance 6,449 [2],[27]   6,449 [2],[27]   $ 6,027 [15],[28]            
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18],[29] 1,836   1,836                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[29] $ (184)   $ (184)                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien                      
Number of investments held | investment 2   2   2 2 2        
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 235            
Spread [15],[16],[20]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 228                
Fair value, ending balance [15],[16],[20]         $ 228            
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 518   $ 518                
Spread [1],[2],[3] 5.50%   5.50%     5.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 466   $ 466                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20],[30]         2,118            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[30]     (62)                
Fair value, ending balance [15],[16],[20],[30]         (62)            
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 1                      
Principal Amount or Par Value $ 22,271 [2],[18],[21],[22]   $ 22,271 [2],[18],[21],[22]   $ 21,910 [15],[19],[23],[24]            
Spread 2.75% [2],[21],[22]   2.75% [2],[21],[22]   2.75% [15],[23],[24],[31] 2.75% [2],[21],[22] 2.75% [15],[23],[24],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 21,266                
Fair value, ending balance $ 20,043 [2],[21],[22]   20,043 [2],[21],[22]   $ 21,266 [15],[23],[24]            
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 2                      
Principal Amount or Par Value $ 4,275 [2],[3],[18],[25]   $ 4,275 [2],[3],[18],[25]   $ 4,206 [15],[16],[19],[26]            
Spread 2.75% [2],[3],[25]   2.75% [2],[3],[25]   2.75% [15],[16],[26],[31] 2.75% [2],[3],[25] 2.75% [15],[16],[26],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 4,082                
Fair value, ending balance $ 3,847 [2],[3],[25]   3,847 [2],[3],[25]   $ 4,082 [15],[16],[26]            
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 3                      
Principal Amount or Par Value $ 3,947 [2],[3],[18],[25]   $ 3,947 [2],[3],[18],[25]   $ 3,884 [15],[16],[19],[26]            
Spread 2.75% [2],[3],[25]   2.75% [2],[3],[25]   2.75% [15],[16],[26],[31] 2.75% [2],[3],[25] 2.75% [15],[16],[26],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 3,769                
Fair value, ending balance $ 3,553 [2],[3],[25]   3,553 [2],[3],[25]   $ 3,769 [15],[16],[26]            
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares                      
Principal Amount or Par Value 19,666   19,666                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[30]     16,419                
Fair value, ending balance 14,751 [2],[3],[29]   14,751 [2],[3],[29]   16,419 [15],[16],[30]            
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., First lien                      
Principal Amount or Par Value $ 3,062 [2],[3],[18],[25]   $ 3,062 [2],[3],[18],[25]   $ 3,062 [15],[16],[19],[26]            
Spread 4.75% [2],[3],[25]   4.75% [2],[3],[25]   4.75% [15],[16],[26] 4.75% [2],[3],[25] 4.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 3,062                
Fair value, ending balance $ 3,062 [2],[3],[25]   3,062 [2],[3],[25]   $ 3,062 [15],[16],[26]            
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., First lien - Undrawn                      
Principal Amount or Par Value 3,077 [1],[2],[3],[18]   3,077 [1],[2],[3],[18]   3,077 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Adelaide Borrower, LLC First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 1,048   1,048                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Adelaide Borrower, LLC First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 667   667                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien                      
Principal Amount or Par Value $ 4,698 [2],[3],[18],[32]   $ 4,698 [2],[3],[18],[32]   $ 4,698 [15],[16],[19],[26],[33]            
Spread 6.25% [2],[3],[32]   6.25% [2],[3],[32]   6.25% [15],[16],[26],[33] 6.25% [2],[3],[32] 6.25% [15],[16],[26],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26],[33]     $ 4,698                
Fair value, ending balance $ 4,698 [2],[3],[32]   4,698 [2],[3],[32]   $ 4,698 [15],[16],[26],[33]            
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         1,048            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         667            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp. First lien                      
Principal Amount or Par Value [2],[3],[18],[25] $ 8,446   $ 8,446                
Spread [2],[3],[25] 6.75%   6.75%     6.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 8,341   $ 8,341                
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                      
Principal Amount or Par Value [15],[16],[19],[26]         $ 8,510            
Spread [15],[16],[26]         6.75%   6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     8,404                
Fair value, ending balance [15],[16],[26]         $ 8,404            
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Class A-1 common units 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[22] 781   781                
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Class A-1 common units 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] $ 753   $ 753                
Investment, Identifier [Axis]: Ambrosia Holdco Corp., First lien                      
Number of investments held | investment 2   2   2 2 2        
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     $ 1,348                
Fair value, ending balance [15],[24]         $ 1,348            
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     1,300                
Fair value, ending balance [15],[16]         1,300            
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         1,969            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 1,969   1,969                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (23)   (23)                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                      
Principal Amount or Par Value $ 18,867 [2],[3],[18],[25]   $ 18,867 [2],[3],[18],[25]   $ 18,964 [15],[19],[23],[24]            
Spread 5.50% [2],[3],[25]   5.50% [2],[3],[25]   5.25% [15],[23],[24] 5.50% [2],[3],[25] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 18,964                
Fair value, ending balance $ 18,646 [2],[3],[25]   18,646 [2],[3],[25]   $ 18,964 [15],[23],[24]            
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                      
Principal Amount or Par Value $ 5,250 [2],[18],[21],[22]   $ 5,250 [2],[18],[21],[22]   $ 5,277 [15],[19],[23],[24]            
Spread 5.50% [2],[21],[22]   5.50% [2],[21],[22]   5.25% [15],[23],[24] 5.50% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 5,277                
Fair value, ending balance $ 5,189 [2],[21],[22]   5,189 [2],[21],[22]   $ 5,277 [15],[23],[24]            
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 3                      
Principal Amount or Par Value $ 690 [2],[3],[18],[25]   $ 690 [2],[3],[18],[25]   $ 693 [15],[16],[19],[26]            
Spread 5.50% [2],[3],[25]   5.50% [2],[3],[25]   5.25% [15],[16],[26] 5.50% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 693                
Fair value, ending balance $ 681 [2],[3],[25]   681 [2],[3],[25]   $ 693 [15],[16],[26]            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First Lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[17],[18] 2,652   2,652                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[17] 0   0                
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 2        
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                      
Principal Amount or Par Value [14],[15],[16],[19],[20]         $ 2,652            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [14],[15],[16],[20]     $ 0                
Fair value, ending balance [14],[15],[16],[20]         0            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                      
Principal Amount or Par Value $ 29,879 [2],[18],[22]   $ 29,879 [2],[18],[22]   $ 29,879 [15],[19],[24]            
Spread 6.75% [2],[22],[34],[35]   6.75% [2],[22],[34],[35]   0.50% [15],[24],[31] 6.75% [2],[22],[34],[35] 0.50% [15],[24],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     $ 17,999                
Fair value, ending balance $ 17,999 [2],[22]   17,999 [2],[22]   $ 17,999 [15],[24]            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                      
Principal Amount or Par Value $ 1,527 [2],[3],[18]   $ 1,527 [2],[3],[18]   $ 1,527 [15],[16],[19]            
Spread 14.50% [2],[3],[34],[35]   14.50% [2],[3],[34],[35]   0.50% [15],[16],[31] 14.50% [2],[3],[34],[35] 0.50% [15],[16],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     $ 0                
Fair value, ending balance $ 0 [2],[3]   0 [2],[3]   $ 0 [15],[16]            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                      
Principal Amount or Par Value               $ 17,927 $ 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 17,999   17,999                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                      
Principal Amount or Par Value 5,230 [2],[3],[18]   5,230 [2],[3],[18]   5,230 [15],[16],[19]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     0                
Fair value, ending balance 0 [2],[3]   0 [2],[3]   0 [15],[16]            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated, Non-accrual status                      
Principal Amount or Par Value                   $ 5,230  
Investment, Identifier [Axis]: Anaplan, Inc., First lien                      
Principal Amount or Par Value $ 10,565 [2],[3],[18],[25]   $ 10,565 [2],[3],[18],[25]   $ 10,618 [15],[16],[19],[26]            
Spread 4.50% [2],[3],[25]   4.50% [2],[3],[25]   5.25% [15],[16],[26] 4.50% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 10,618                
Fair value, ending balance $ 10,565 [2],[3],[25]   10,565 [2],[3],[25]   $ 10,618 [15],[16],[26]            
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[36]     0                
Fair value, ending balance 0 [2],[37]   0 [2],[37]   0 [15],[36]            
Investment, Identifier [Axis]: Associations, Inc., First Lien Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 1,260   $ 1,260                
Spread [1],[2],[3] 6.50%   6.50%     6.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 1,260   $ 1,260                
Investment, Identifier [Axis]: Associations, Inc., First lien                      
Principal Amount or Par Value [15],[16],[19],[26]         $ 49,430            
Spread [15],[16],[26]         6.50%   6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     49,430                
Fair value, ending balance [15],[16],[26]         $ 49,430            
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 641            
Spread [15],[16],[20]         6.50%   6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     641                
Fair value, ending balance [15],[16],[20]         $ 641            
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 377   377                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value 2,573 [1],[2],[3],[18]   2,573 [1],[2],[3],[18]   3,200 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 1,539            
Spread [15],[16],[20]         6.50%   6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     1,539                
Fair value, ending balance [15],[16],[20]         $ 1,539            
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         1,539            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Associations, Inc., First lien 1                      
Principal Amount or Par Value [2],[3],[18],[25] $ 49,181   $ 49,181                
Spread [2],[3],[25] 6.50%   6.50%     6.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 49,181   $ 49,181                
Investment, Identifier [Axis]: Associations, Inc., First lien 2                      
Principal Amount or Par Value [1],[2],[3],[18] $ 2,701   $ 2,701                
Spread [1],[2],[3] 6.50%   6.50%     6.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 2,701   $ 2,701                
Investment, Identifier [Axis]: Associations, Inc., Subordinated 1                      
Principal Amount or Par Value 8,540 [2],[3],[18]   8,540 [2],[3],[18]   7,959 [15],[16],[19]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     7,959                
Fair value, ending balance 8,711 [2],[3]   8,711 [2],[3]   7,959 [15],[16]            
Investment, Identifier [Axis]: Associations, Inc., Subordinated 2                      
Principal Amount or Par Value 3,261 [2],[3],[18]   3,261 [2],[3],[18]   3,039 [15],[16],[19]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     3,039                
Fair value, ending balance 3,342 [2],[3]   3,342 [2],[3]   3,039 [15],[16]            
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                      
Principal Amount or Par Value [2],[3],[18],[25],[32] $ 34,459   $ 34,459                
Spread [2],[3],[25],[32] 8.25%   8.25%     8.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25],[32] $ 34,459   $ 34,459                
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                      
Principal Amount or Par Value [15],[16],[19],[26],[33]         $ 34,459            
Spread [15],[16],[26],[33]         8.25%   8.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26],[33]     34,459                
Fair value, ending balance [15],[16],[26],[33]         $ 34,459            
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18],[32] 790   790                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[32] 0   0                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20],[33]         320            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[33]     0                
Fair value, ending balance [15],[16],[20],[33]         0            
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 1                      
Principal Amount or Par Value $ 4,485 [2],[18],[21],[22]   $ 4,485 [2],[18],[21],[22]   $ 3,445 [15],[16],[19],[26]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[16],[26] 5.00% [2],[21],[22] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 3,445                
Fair value, ending balance $ 4,474 [2],[21],[22]   4,474 [2],[21],[22]   $ 3,445 [15],[16],[26]            
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 2                      
Principal Amount or Par Value $ 3,428 [2],[3],[18],[25]   $ 3,428 [2],[3],[18],[25]   $ 1,342 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   5.00% [15],[16],[26] 5.00% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 1,342                
Fair value, ending balance $ 3,428 [2],[3],[25]   3,428 [2],[3],[25]   $ 1,342 [15],[16],[26]            
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 3                      
Principal Amount or Par Value [2],[3],[18],[25] $ 1,335   $ 1,335                
Spread [2],[3],[25] 5.00%   5.00%     5.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 1,335   $ 1,335                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien                      
Principal Amount or Par Value [2],[3],[18],[25] $ 36,155   $ 36,155                
Spread [2],[3],[25] 5.75%   5.75%     5.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 35,446   $ 35,446                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                      
Principal Amount or Par Value [15],[16],[19],[26]         $ 21,624            
Spread [15],[16],[26]         5.75%   5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     21,138                
Fair value, ending balance [15],[16],[26]         $ 21,138            
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 14,624            
Spread [15],[23],[24]         5.75%   5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     14,295                
Fair value, ending balance [15],[23],[24]         $ 14,295            
Investment, Identifier [Axis]: Avalara, Inc., First lien                      
Principal Amount or Par Value [15],[16],[19],[26]         $ 17,198            
Spread [15],[16],[26]         6.25%   6.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     17,198                
Fair value, ending balance [15],[16],[26]         $ 17,198            
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         1,720            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         $ 0            
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                      
Spread [16],[26],[33]         11.75%   11.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [16],[26],[33]     13,867                
Fair value, ending balance [16],[26],[33]         $ 13,867            
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien                      
Principal Amount or Par Value [15],[16],[19],[26]         $ 13,687            
Spread [15],[16],[26]         4.75%   4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     13,585                
Fair value, ending balance [15],[16],[26]         $ 13,585            
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien - Undrawn 1                      
Principal Amount or Par Value 2,500 [1],[2],[3],[18]   2,500 [1],[2],[3],[18]   2,065 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (15)                
Fair value, ending balance (13) [1],[2],[3]   (13) [1],[2],[3]   (15) [15],[16],[20]            
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien - Undrawn 2                      
Principal Amount or Par Value 3,707 [1],[2],[3],[18]   3,707 [1],[2],[3],[18]   2,894 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (22)                
Fair value, ending balance (19) [1],[2],[3]   (19) [1],[2],[3]   (22) [15],[16],[20]            
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien 1                      
Principal Amount or Par Value [2],[3],[18],[25] $ 15,681   $ 15,681                
Spread [2],[3],[25] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 15,681   $ 15,681                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien 2                      
Principal Amount or Par Value [2],[18],[21],[22] $ 5,782   $ 5,782                
Spread [2],[21],[22] 4.50%   4.50%     4.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[21],[22] $ 5,753   $ 5,753                
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien                      
Principal Amount or Par Value $ 3,046 [2],[3],[18],[25]   $ 3,046 [2],[3],[18],[25]   $ 6,109 [15],[16],[19],[26],[38]            
Spread 4.75% [2],[3],[25]   4.75% [2],[3],[25]   7.00% [15],[16],[26],[38] 4.75% [2],[3],[25] 7.00% [15],[16],[26],[38]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26],[38]     $ 6,109                
Fair value, ending balance $ 3,046 [2],[3],[25]   3,046 [2],[3],[25]   $ 6,109 [15],[16],[26],[38]            
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien - Undrawn                      
Principal Amount or Par Value 417 [1],[2],[3],[18]   417 [1],[2],[3],[18]   417 [15],[16],[19],[20],[38]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[38]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20],[38]            
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, beginning balance [15],[16],[38]     3,371                
Fair value, ending balance [15],[16],[38]         3,371            
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First Lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 1,685   1,685                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien - Drawn                      
Principal Amount or Par Value $ 465 [1],[2],[3],[18]   $ 465 [1],[2],[3],[18]   $ 467 [15],[16],[19],[20]            
Spread 4.75% [1],[2],[3]   4.75% [1],[2],[3]   4.75% [15],[16],[20] 4.75% [1],[2],[3] 4.75% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 467                
Fair value, ending balance $ 465 [1],[2],[3]   465 [1],[2],[3]   $ 467 [15],[16],[20]            
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         1,685            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Bonterra LLC, First lien                      
Principal Amount or Par Value [2],[3],[18],[25] $ 15,065   $ 15,065                
Spread [2],[3],[25] 5.00%   5.00%     5.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 15,027   $ 15,027                
Investment, Identifier [Axis]: Bonterra LLC, First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 347   $ 347                
Spread [1],[2],[3] 5.00%   5.00%     5.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 346   $ 346                
Investment, Identifier [Axis]: Bonterra LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 1,282   1,282                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (3)   (3)                
Investment, Identifier [Axis]: Bonterra LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 1,629   1,629                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (4)   (4)                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 1,594   1,594                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Drawn 1                      
Principal Amount or Par Value [15],[19],[20],[39]         $ 1,319            
Spread [15],[20],[39]         5.00%   5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[39]     1,319                
Fair value, ending balance [15],[20],[39]         $ 1,319            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Drawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 516            
Spread [15],[16],[20]         5.00%   5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     516                
Fair value, ending balance [15],[16],[20]         $ 516            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         376            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         1,594            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 3                      
Principal Amount or Par Value [15],[19],[20],[39]         963            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[39]     0                
Fair value, ending balance [15],[20],[39]         0            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 1                      
Principal Amount or Par Value $ 19,919 [2],[18],[40]   $ 19,919 [2],[18],[40]   $ 20,019 [15],[19],[39]            
Spread 5.00% [2],[40]   5.00% [2],[40]   5.00% [15],[39] 5.00% [2],[40] 5.00% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 20,019                
Fair value, ending balance $ 19,919 [2],[40]   19,919 [2],[40]   $ 20,019 [15],[39]            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 2                      
Principal Amount or Par Value $ 7,788 [2],[18],[21],[22]   $ 7,788 [2],[18],[21],[22]   $ 7,827 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 7,827                
Fair value, ending balance $ 7,788 [2],[21],[22]   7,788 [2],[21],[22]   $ 7,827 [15],[23],[24]            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 3                      
Principal Amount or Par Value [2],[18],[40] $ 1,313   $ 1,313                
Spread [2],[40] 5.00%   5.00%     5.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[40] $ 1,313   $ 1,313                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 4                      
Principal Amount or Par Value [2],[3],[18] $ 513   $ 513                
Spread [2],[3] 5.00%   5.00%     5.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] $ 513   $ 513                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         935            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 417            
Spread [15],[16],[20]         5.00%   5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     417                
Fair value, ending balance [15],[16],[20]         $ 417            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value 1,847 [1],[2],[3],[18]   1,847 [1],[2],[3],[18]   1,847 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 935   935                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                      
Principal Amount or Par Value $ 13,206 [2],[18],[21],[22]   $ 13,206 [2],[18],[21],[22]   $ 13,206 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 13,206                
Fair value, ending balance $ 13,206 [2],[21],[22]   13,206 [2],[21],[22]   $ 13,206 [15],[23],[24]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                      
Principal Amount or Par Value $ 8,879 [2],[3],[18],[25]   $ 8,879 [2],[3],[18],[25]   $ 8,462 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   5.00% [15],[16],[26] 5.00% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 8,462                
Fair value, ending balance $ 8,879 [2],[3],[25]   8,879 [2],[3],[25]   $ 8,462 [15],[16],[26]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                      
Principal Amount or Par Value $ 3,398 [2],[18],[21],[22]   $ 3,398 [2],[18],[21],[22]   $ 3,398 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 3,398                
Fair value, ending balance $ 3,398 [2],[21],[22]   3,398 [2],[21],[22]   $ 3,398 [15],[23],[24]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                      
Principal Amount or Par Value $ 761 [2],[18],[21],[22]   $ 761 [2],[18],[21],[22]   $ 761 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 761                
Fair value, ending balance $ 761 [2],[21],[22]   761 [2],[21],[22]   $ 761 [15],[23],[24]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                      
Principal Amount or Par Value $ 341 [2],[18],[21],[22]   $ 341 [2],[18],[21],[22]   $ 341 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 341                
Fair value, ending balance $ 341 [2],[21],[22]   341 [2],[21],[22]   $ 341 [15],[23],[24]            
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 6                      
Principal Amount or Par Value $ 272 [2],[18],[21],[22]   $ 272 [2],[18],[21],[22]   $ 272 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 272                
Fair value, ending balance $ 272 [2],[21],[22]   272 [2],[21],[22]   $ 272 [15],[23],[24]            
Investment, Identifier [Axis]: CB Buyer, Inc., First lien                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 3,308            
Spread [15],[23],[24]         5.25%   5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     3,292                
Fair value, ending balance [15],[23],[24]         $ 3,292            
Investment, Identifier [Axis]: CB Buyer, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         364            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (2)                
Fair value, ending balance [15],[16],[20]         (2)            
Investment, Identifier [Axis]: CB Buyer, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         934            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (5)                
Fair value, ending balance [15],[16],[20]         (5)            
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                      
Principal Amount or Par Value $ 11,957 [2],[3],[18],[25]   $ 11,957 [2],[3],[18],[25]   $ 11,881 [15],[19],[23],[24]            
Spread 6.25% [2],[3],[25],[35]   6.25% [2],[3],[25],[35]   6.25% [15],[23],[24],[31] 6.25% [2],[3],[25],[35] 6.25% [15],[23],[24],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 10,693                
Fair value, ending balance $ 10,462 [2],[3],[25]   10,462 [2],[3],[25]   $ 10,693 [15],[23],[24]            
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                      
Principal Amount or Par Value $ 3,562 [2],[18],[21],[22]   $ 3,562 [2],[18],[21],[22]   $ 3,539 [15],[19],[23],[24]            
Spread 6.25% [2],[21],[22],[35]   6.25% [2],[21],[22],[35]   6.25% [15],[23],[24],[31] 6.25% [2],[21],[22],[35] 6.25% [15],[23],[24],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 3,185                
Fair value, ending balance $ 3,117 [2],[21],[22]   3,117 [2],[21],[22]   $ 3,185 [15],[23],[24]            
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                      
Principal Amount or Par Value $ 8,537 [2],[18],[21],[22]   $ 8,537 [2],[18],[21],[22]   $ 8,493 [15],[19],[23],[24]            
Spread 6.75% [2],[21],[22],[35]   6.75% [2],[21],[22],[35]   6.75% [15],[23],[24],[31] 6.75% [2],[21],[22],[35] 6.75% [15],[23],[24],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 8,449                
Fair value, ending balance $ 8,537 [2],[21],[22]   8,537 [2],[21],[22]   $ 8,449 [15],[23],[24]            
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                      
Principal Amount or Par Value $ 1,078 [1],[2],[3],[18],[25]   $ 1,078 [1],[2],[3],[18],[25]   $ 954 [15],[16],[19],[20],[26]            
Spread 6.75% [1],[2],[3],[25],[35]   6.75% [1],[2],[3],[25],[35]   6.75% [15],[16],[20],[26],[31] 6.75% [1],[2],[3],[25],[35] 6.75% [15],[16],[20],[26],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26]     $ 950                
Fair value, ending balance $ 1,078 [1],[2],[3],[25]   1,078 [1],[2],[3],[25]   $ 950 [15],[16],[20],[26]            
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                      
Principal Amount or Par Value 113 [1],[2],[3],[18]   113 [1],[2],[3],[18]   226 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (1)                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   (1) [15],[16],[20]            
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien                      
Principal Amount or Par Value $ 6,483 [2],[18],[21],[22]   $ 6,483 [2],[18],[21],[22]   $ 6,516 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 6,483                
Fair value, ending balance $ 6,451 [2],[21],[22]   6,451 [2],[21],[22]   $ 6,483 [15],[23],[24]            
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Drawn                      
Principal Amount or Par Value [15],[16],[19],[20],[26]         $ 489            
Spread [15],[16],[20],[26]         5.00%   5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26]     486                
Fair value, ending balance [15],[16],[20],[26]         $ 486            
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value 1,086 [1],[2],[3],[18]   1,086 [1],[2],[3],[18]   597 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (3)                
Fair value, ending balance (5) [1],[2],[3]   (5) [1],[2],[3]   (3) [15],[16],[20]            
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value 1,629 [1],[2],[3],[18]   1,629 [1],[2],[3],[18]   1,629 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (8)                
Fair value, ending balance (8) [1],[2],[3]   (8) [1],[2],[3]   (8) [15],[16],[20]            
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                      
Principal Amount or Par Value 850 [1],[2],[3],[18]   850 [1],[2],[3],[18]   850 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                      
Principal Amount or Par Value $ 637 [1],[2],[3],[18]   $ 637 [1],[2],[3],[18]   $ 637 [15],[16],[19],[20]            
Spread 5.50% [1],[2],[3]   5.50% [1],[2],[3]   5.50% [15],[16],[20] 5.50% [1],[2],[3] 5.50% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 637                
Fair value, ending balance $ 637 [1],[2],[3]   637 [1],[2],[3]   $ 637 [15],[16],[20]            
Investment, Identifier [Axis]: Calabrio, Inc., First lien 1                      
Principal Amount or Par Value $ 12,224 [2],[18],[40]   $ 12,224 [2],[18],[40]   $ 12,286 [15],[19],[39]            
Spread 5.50% [2],[40]   5.50% [2],[40]   5.50% [15],[39] 5.50% [2],[40] 5.50% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 12,286                
Fair value, ending balance $ 12,224 [2],[40]   12,224 [2],[40]   $ 12,286 [15],[39]            
Investment, Identifier [Axis]: Calabrio, Inc., First lien 2                      
Principal Amount or Par Value $ 1,566 [2],[18],[40]   $ 1,566 [2],[18],[40]   $ 1,574 [15],[19],[39]            
Spread 5.50% [2],[40]   5.50% [2],[40]   5.50% [15],[39] 5.50% [2],[40] 5.50% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 1,574                
Fair value, ending balance $ 1,566 [2],[40]   1,566 [2],[40]   $ 1,574 [15],[39]            
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                      
Principal Amount or Par Value $ 11,670 [18],[27]   $ 11,670 [18],[27]   $ 11,730 [19],[28]            
Spread 4.50% [27]   4.50% [27]   4.50% [28] 4.50% [27] 4.50% [28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [28]     $ 11,249                
Fair value, ending balance $ 11,398 [27]   11,398 [27]   $ 11,249 [28]            
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                      
Principal Amount or Par Value $ 9,767 [2],[18],[27]   $ 9,767 [2],[18],[27]   $ 9,767 [15],[19],[28]            
Spread 7.75% [2],[27]   7.75% [2],[27]   7.75% [15],[28] 7.75% [2],[27] 7.75% [15],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     $ 9,423                
Fair value, ending balance $ 9,613 [2],[27]   9,613 [2],[27]   $ 9,423 [15],[28]            
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, First lien                      
Principal Amount or Par Value $ 36,254 [2],[18],[21],[22]   $ 36,254 [2],[18],[21],[22]   $ 35,797 [15],[19],[23],[24]            
Spread 2.75% [2],[21],[22],[35]   2.75% [2],[21],[22],[35]   2.88% [15],[23],[24],[31] 2.75% [2],[21],[22],[35] 2.88% [15],[23],[24],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 35,797                
Fair value, ending balance $ 36,254 [2],[21],[22]   36,254 [2],[21],[22]   $ 35,797 [15],[23],[24]            
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, First lien - Undrawn                      
Principal Amount or Par Value 3,980 [1],[2],[3],[18]   3,980 [1],[2],[3],[18]   3,980 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Ciklum Inc. First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 5,366   $ 5,366                
Spread [1],[2],[3] 6.50%   6.50%     6.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 5,366   $ 5,366                
Investment, Identifier [Axis]: Ciklum Inc. First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 6,575   6,575                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Ciklum Inc. First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 2,989   2,989                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Ciklum Inc., First lien                      
Principal Amount or Par Value $ 9,488 [2],[18],[21],[22]   $ 9,488 [2],[18],[21],[22]   $ 9,536 [15],[19],[23],[24],[33]            
Spread 6.50% [2],[21],[22]   6.50% [2],[21],[22]   6.50% [15],[23],[24],[33] 6.50% [2],[21],[22] 6.50% [15],[23],[24],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24],[33]     $ 9,536                
Fair value, ending balance $ 9,488 [2],[21],[22]   9,488 [2],[21],[22]   $ 9,536 [15],[23],[24],[33]            
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         11,955            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         2,989            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Cleanova US Holdings, LLC, First lien                      
Principal Amount or Par Value [2],[18],[21],[22],[32] $ 8,406   $ 8,406                
Spread [2],[21],[22],[32] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[21],[22],[32] $ 8,123   $ 8,123                
Investment, Identifier [Axis]: CommerceHub, Inc., First lien                      
Principal Amount or Par Value $ 3,900 [3],[18],[25]   $ 3,900 [3],[18],[25]   $ 3,920 [15],[16],[19],[26]            
Spread 6.25% [3],[25]   6.25% [3],[25]   6.25% [15],[16],[26] 6.25% [3],[25] 6.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 3,920                
Fair value, ending balance $ 3,900 [3],[25]   3,900 [3],[25]   $ 3,920 [15],[16],[26]            
Investment, Identifier [Axis]: Compsych Investments Corp., First lien                      
Principal Amount or Par Value $ 7,846 [2],[18],[21],[22]   $ 7,846 [2],[18],[21],[22]   $ 1,164 [15],[19],[23],[24]            
Spread 4.75% [2],[21],[22]   4.75% [2],[21],[22]   4.75% [15],[23],[24] 4.75% [2],[21],[22] 4.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 1,162                
Fair value, ending balance $ 7,827 [2],[21],[22]   7,827 [2],[21],[22]   $ 1,162 [15],[23],[24]            
Investment, Identifier [Axis]: Compsych Investments Corp., First lien - Undrawn                      
Principal Amount or Par Value 2,253 [1],[2],[3],[18]   2,253 [1],[2],[3],[18]   333 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (1)                
Fair value, ending balance (6) [1],[2],[3]   (6) [1],[2],[3]   (1) [15],[16],[20]            
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                      
Principal Amount or Par Value $ 13,337 [2],[3],[18],[25]   $ 13,337 [2],[3],[18],[25]   $ 13,152 [15],[16],[19],[26]            
Spread 1.00% [2],[3],[25],[35]   1.00% [2],[3],[25],[35]   1.00% [15],[16],[26],[31] 1.00% [2],[3],[25],[35] 1.00% [15],[16],[26],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 11,935                
Fair value, ending balance $ 12,154 [2],[3],[25]   12,154 [2],[3],[25]   $ 11,935 [15],[16],[26]            
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                      
Principal Amount or Par Value $ 2,227 [2],[3],[18],[25]   $ 2,227 [2],[3],[18],[25]   $ 2,196 [15],[16],[19],[26]            
Spread 1.00% [2],[3],[25],[35]   1.00% [2],[3],[25],[35]   1.00% [15],[16],[26],[31] 1.00% [2],[3],[25],[35] 1.00% [15],[16],[26],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 1,993                
Fair value, ending balance $ 2,030 [2],[3],[25]   2,030 [2],[3],[25]   $ 1,993 [15],[16],[26]            
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien                      
Principal Amount or Par Value $ 1,044 [2],[3],[18],[25]   $ 1,044 [2],[3],[18],[25]   $ 1,050 [15],[16],[19],[26]            
Spread 5.25% [2],[3],[25]   5.25% [2],[3],[25]   5.25% [15],[16],[26] 5.25% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 1,050                
Fair value, ending balance $ 1,044 [2],[3],[25]   1,044 [2],[3],[25]   $ 1,050 [15],[16],[26]            
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         578            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 578   578                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien                      
Principal Amount or Par Value $ 14,316 [2],[3],[18],[25]   $ 14,316 [2],[3],[18],[25]   $ 14,388 [15],[16],[19],[26]            
Spread 5.25% [2],[3],[25]   5.25% [2],[3],[25]   5.25% [15],[16],[26] 5.25% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 14,388                
Fair value, ending balance $ 14,316 [2],[3],[25]   14,316 [2],[3],[25]   $ 14,388 [15],[16],[26]            
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 1,291   1,291                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 989   989                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         1,291            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         989            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                      
Principal Amount or Par Value $ 1,795 [2],[18],[21],[22]   $ 1,795 [2],[18],[21],[22]   $ 1,804 [15],[19],[23],[24]            
Spread 6.41% [2],[21],[22]   6.41% [2],[21],[22]   6.41% [15],[23],[24] 6.41% [2],[21],[22] 6.41% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 1,758                
Fair value, ending balance $ 1,634 [2],[21],[22]   1,634 [2],[21],[22]   $ 1,758 [15],[23],[24]            
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                      
Principal Amount or Par Value $ 1,006 [2],[3],[18],[25]   $ 1,006 [2],[3],[18],[25]   $ 1,011 [15],[16],[19],[26]            
Spread 6.50% [2],[3],[25]   6.50% [2],[3],[25]   6.50% [15],[16],[26] 6.50% [2],[3],[25] 6.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 987                
Fair value, ending balance $ 918 [2],[3],[25]   918 [2],[3],[25]   $ 987 [15],[16],[26]            
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                      
Principal Amount or Par Value $ 20,313 [3],[18],[25]   $ 20,313 [3],[18],[25]   $ 20,313 [16],[19],[26]            
Spread 6.75% [3],[25]   6.75% [3],[25]   6.75% [16],[26] 6.75% [3],[25] 6.75% [16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [16],[26]     $ 20,281                
Fair value, ending balance $ 20,244 [3],[25]   20,244 [3],[25]   $ 20,281 [16],[26]            
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 120   $ 120                
Spread [1],[2],[3] 5.75%   5.75%     5.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 119   $ 119                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                      
Principal Amount or Par Value 2,284 [1],[2],[3],[18]   2,284 [1],[2],[3],[18]   2,405 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (13)                
Fair value, ending balance (20) [1],[2],[3]   (20) [1],[2],[3]   (13) [15],[16],[20]            
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                      
Principal Amount or Par Value $ 18,243 [2],[3],[18],[25]   $ 18,243 [2],[3],[18],[25]   $ 18,337 [15],[16],[19],[26]            
Spread 5.75% [2],[3],[25]   5.75% [2],[3],[25]   5.75% [15],[16],[26] 5.75% [2],[3],[25] 5.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 18,236                
Fair value, ending balance $ 18,081 [2],[3],[25]   18,081 [2],[3],[25]   $ 18,236 [15],[16],[26]            
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                      
Principal Amount or Par Value $ 6,832 [2],[18],[27]   $ 6,832 [2],[18],[27]   $ 6,867 [15],[19],[28]            
Spread 5.75% [2],[27]   5.75% [2],[27]   5.75% [15],[28] 5.75% [2],[27] 5.75% [15],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     $ 6,829                
Fair value, ending balance $ 6,771 [2],[27]   6,771 [2],[27]   $ 6,829 [15],[28]            
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 3                      
Principal Amount or Par Value [2],[3],[18],[25] $ 3,371   $ 3,371                
Spread [2],[3],[25] 5.75%   5.75%     5.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 3,341   $ 3,341                
Investment, Identifier [Axis]: DOXA Insurance Holdings LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 3,046   3,046                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: DOXA Insurance Holdings LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         3,046            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: DT1 Midco Corp, First lien                      
Principal Amount or Par Value [18],[21],[22] $ 1,348   $ 1,348                
Spread [21],[22] 5.00%   5.00%     5.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [21],[22] $ 1,342   $ 1,342                
Investment, Identifier [Axis]: DT1 Midco Corp, First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 32   $ 32                
Spread [1],[2],[3] 5.00%   5.00%     5.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 32   $ 32                
Investment, Identifier [Axis]: DT1 Midco Corp, First lien - Undrawn 1                      
Principal Amount or Par Value [1],[3],[18] 674   674                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[3] (3)   (3)                
Investment, Identifier [Axis]: DT1 Midco Corp, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[3],[18] 4,462   4,462                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[3] (22)   (22)                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 986   986                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         986            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                      
Principal Amount or Par Value $ 12,812 [2],[3],[18],[25]   $ 12,812 [2],[3],[18],[25]   $ 12,878 [15],[16],[19],[26]            
Spread 4.75% [2],[3],[25]   4.75% [2],[3],[25]   5.00% [15],[16],[26] 4.75% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 12,878                
Fair value, ending balance $ 12,812 [2],[3],[25]   12,812 [2],[3],[25]   $ 12,878 [15],[16],[26]            
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                      
Principal Amount or Par Value $ 1,080 [2],[18],[21],[22]   $ 1,080 [2],[18],[21],[22]   $ 1,085 [15],[19],[23],[24]            
Spread 4.75% [2],[21],[22]   4.75% [2],[21],[22]   5.00% [15],[23],[24] 4.75% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 1,085                
Fair value, ending balance $ 1,080 [2],[21],[22]   1,080 [2],[21],[22]   $ 1,085 [15],[23],[24]            
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 3                      
Principal Amount or Par Value $ 65 [2],[3],[18]   $ 65 [2],[3],[18]   $ 65 [15],[16],[19]            
Spread 4.75% [2],[3]   4.75% [2],[3]   5.00% [15],[16] 4.75% [2],[3] 5.00% [15],[16]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     $ 65                
Fair value, ending balance $ 65 [2],[3]   65 [2],[3]   $ 65 [15],[16]            
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred Shares                      
Principal Amount or Par Value 84,739   84,739                
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     79,222                
Fair value, ending balance 77,553 [2],[3],[25],[41]   77,553 [2],[3],[25],[41]   79,222 [15],[16],[26]            
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn                      
Principal Amount or Par Value [15],[16],[19],[20],[26]         $ 3,027            
Spread [15],[16],[20],[26]         5.75%   5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26]     2,987                
Fair value, ending balance [15],[16],[20],[26]         $ 2,987            
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18],[25] $ 3,027   $ 3,027                
Spread [1],[2],[3],[25] 5.75%   5.75%     5.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25] $ 2,947   $ 2,947                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien 1                      
Principal Amount or Par Value $ 36,902 [2],[18],[21],[22]   $ 36,902 [2],[18],[21],[22]   $ 37,094 [15],[19],[23],[24]            
Spread 5.75% [2],[21],[22]   5.75% [2],[21],[22]   5.75% [15],[23],[24] 5.75% [2],[21],[22] 5.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 36,604                
Fair value, ending balance $ 35,928 [2],[21],[22]   35,928 [2],[21],[22]   $ 36,604 [15],[23],[24]            
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien 2                      
Principal Amount or Par Value $ 3,884 [2],[3],[18],[25]   $ 3,884 [2],[3],[18],[25]   $ 3,905 [15],[16],[19],[26]            
Spread 5.75% [2],[3],[25]   5.75% [2],[3],[25]   5.75% [15],[16],[26] 5.75% [2],[3],[25] 5.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 3,853                
Fair value, ending balance $ 3,782 [2],[3],[25]   $ 3,782 [2],[3],[25]   $ 3,853 [15],[16],[26]            
Investment, Identifier [Axis]: Diamond Parent Holdings Corp, Wholly-owned subsidiaries                      
Number of investments held | investment 2   2   2 2 2        
Investment, Identifier [Axis]: Digital Corporation, First Lien                      
Number of investments held | investment 2   2     2          
Investment, Identifier [Axis]: Diligent Corporation, First lien                      
Number of investments held | investment         2   2        
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] $ 2,096   $ 2,096                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 3,398   3,398                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 170   $ 170                
Spread [1],[2],[3] 5.00%   5.00%     5.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 170   $ 170                
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 2,265            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         3,398            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                      
Principal Amount or Par Value $ 19,821 [2],[18],[21],[22]   $ 19,821 [2],[18],[21],[22]   $ 19,821 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 19,821                
Fair value, ending balance $ 19,821 [2],[21],[22]   19,821 [2],[21],[22]   $ 19,821 [15],[23],[24]            
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                      
Principal Amount or Par Value $ 3,398 [2],[3],[18],[25]   $ 3,398 [2],[3],[18],[25]   $ 3,398 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   5.00% [15],[16],[26] 5.00% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 3,398                
Fair value, ending balance $ 3,398 [2],[3],[25]   3,398 [2],[3],[25]   $ 3,398 [15],[16],[26]            
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                      
Principal Amount or Par Value 15,037   15,037                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[42]     13,609                
Fair value, ending balance 14,277 [2],[3],[43]   14,277 [2],[3],[43]   13,609 [15],[16],[42]            
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                      
Principal Amount or Par Value $ 10,628 [2],[18],[21],[22]   $ 10,628 [2],[18],[21],[22]   $ 10,628 [15],[19],[23],[24]            
Spread 7.50% [2],[21],[22]   7.50% [2],[21],[22]   7.50% [15],[23],[24] 7.50% [2],[21],[22] 7.50% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 10,628                
Fair value, ending balance $ 10,628 [2],[21],[22]   10,628 [2],[21],[22]   $ 10,628 [15],[23],[24]            
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 2                      
Principal Amount or Par Value $ 340 [2],[3],[18]   $ 340 [2],[3],[18]   $ 340 [15],[16],[19]            
Spread 7.50% [2],[3]   7.50% [2],[3]   7.50% [15],[16] 7.50% [2],[3] 7.50% [15],[16]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     $ 340                
Fair value, ending balance $ 340 [2],[3]   340 [2],[3]   $ 340 [15],[16]            
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 [15],[16]     8,188                
Fair value, ending balance 7,370 [2],[3]   7,370 [2],[3]   8,188 [15],[16]            
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien                      
Principal Amount or Par Value $ 7,113 [2],[18],[27],[44]   $ 7,113 [2],[18],[27],[44]   $ 7,113 [15],[19],[28],[45]            
Spread 4.75% [2],[27],[44]   4.75% [2],[27],[44]   4.75% [15],[28],[45] 4.75% [2],[27],[44] 4.75% [15],[28],[45]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28],[45]     $ 7,078                
Fair value, ending balance $ 7,077 [2],[27],[44]   7,077 [2],[27],[44]   $ 7,078 [15],[28],[45]            
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[18],[27] 1,206   1,206                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[27] (6)   (6)                
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[19],[20],[28]         1,206            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[28]     (6)                
Fair value, ending balance [15],[20],[28]         (6)            
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien - Undrawn 2                      
Principal Amount or Par Value 4,190 [1],[2],[3],[18]   4,190 [1],[2],[3],[18]   4,190 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (21)                
Fair value, ending balance (21) [1],[2],[3]   (21) [1],[2],[3]   (21) [15],[16],[20]            
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, beginning balance [15],[16]     305                
Fair value, ending balance 305 [2],[3]   305 [2],[3]   305 [15],[16]            
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, beginning balance [15],[16]     2,900                
Fair value, ending balance [15],[16]         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, beginning balance [15],[16]     2,702                
Fair value, ending balance [15],[16]         2,702            
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Series A preferred shares                      
Principal Amount or Par Value 3,335   3,335                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] 3,335   3,335                
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Series B preferred shares                      
Principal Amount or Par Value 3,691   3,691                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] 2,702   2,702                
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 2,702   2,702                
Investment, Identifier [Axis]: Eclipse Topco, Inc., Preferred shares                      
Principal Amount or Par Value 2,094   2,094                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28],[45]     1,952                
Fair value, ending balance 2,073 [2],[27],[44]   2,073 [2],[27],[44]   1,952 [15],[28],[45]            
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC Subordinated                      
Principal Amount or Par Value [2],[3],[18],[46] 24,333   24,333                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[46] 24,333   24,333                
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                      
Principal Amount or Par Value [15],[16],[19]         22,290            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     22,290                
Fair value, ending balance [15],[16]         $ 22,290            
Investment, Identifier [Axis]: Einstein Parent, Inc. First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 5,750   5,750                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (57)   (57)                
Investment, Identifier [Axis]: Einstein Parent, Inc., First lien 1                      
Principal Amount or Par Value [2],[3],[18],[25] $ 55,582   $ 55,582                
Spread [2],[3],[25] 6.50%   6.50%     6.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 55,026   $ 55,026                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien                      
Number of investments held | investment 5   5   3 5 3        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] $ 909   $ 909                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[18],[40] 2,723   2,723                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[40] 0   0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 3                      
Principal Amount or Par Value [1],[2],[3],[18] 1,400   1,400                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20],[47]         $ 1,400            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[47]     0                
Fair value, ending balance [15],[16],[20],[47]         0            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                      
Principal Amount or Par Value $ 8,501 [2],[18],[40]   $ 8,501 [2],[18],[40]   $ 10,185 [15],[19],[39]            
Spread 5.00% [2],[40]   5.00% [2],[40]   5.75% [15],[39] 5.00% [2],[40] 5.75% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 10,185                
Fair value, ending balance $ 8,501 [2],[40]   8,501 [2],[40]   $ 10,185 [15],[39]            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                      
Principal Amount or Par Value $ 4,739 [2],[3],[18],[25]   $ 4,739 [2],[3],[18],[25]   $ 5,677 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   6.00% [15],[16],[26] 5.00% [2],[3],[25] 6.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 5,677                
Fair value, ending balance $ 4,739 [2],[3],[25]   4,739 [2],[3],[25]   $ 5,677 [15],[16],[26]            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                      
Principal Amount or Par Value $ 2,854 [2],[18],[40]   $ 2,854 [2],[18],[40]   $ 3,419 [15],[19],[39]            
Spread 5.00% [2],[40]   5.00% [2],[40]   5.75% [15],[39] 5.00% [2],[40] 5.75% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 3,419                
Fair value, ending balance $ 2,854 [2],[40]   2,854 [2],[40]   $ 3,419 [15],[39]            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 4                      
Principal Amount or Par Value $ 2,836 [2],[18],[40]   $ 2,836 [2],[18],[40]   $ 3,397 [15],[19],[39]            
Spread 5.00% [2],[40]   5.00% [2],[40]   5.75% [15],[39] 5.00% [2],[40] 5.75% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 3,397                
Fair value, ending balance $ 2,836 [2],[40]   2,836 [2],[40]   $ 3,397 [15],[39]            
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC, Ordinary shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39],[47]     4,618                
Fair value, ending balance 4,845 [2],[40],[48]   4,845 [2],[40],[48]   4,618 [15],[39],[47]            
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc., First lien                      
Principal Amount or Par Value [2],[3],[18],[25] $ 8,113   $ 8,113                
Spread [2],[3],[25],[35] 2.25%   2.25%     2.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 8,093   $ 8,093                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc., First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 278   $ 278                
Spread [1],[2],[3] 4.50%   4.50%     4.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 278   $ 278                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 1,422   1,422                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (4)   (4)                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 4,462   4,462                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (11)   (11)                
Investment, Identifier [Axis]: Firebird Co-Invest L.P., LP Interest                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[49] 3,358   3,358                
Investment, Identifier [Axis]: Flash Charm Inc. (fka Idera, Inc.), Second lien 1                      
Principal Amount or Par Value [18],[27] $ 10,719   $ 10,719                
Spread [27] 6.75%   6.75%     6.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [27] $ 9,486   $ 9,486                
Investment, Identifier [Axis]: Flash Charm Inc. (fka Idera, Inc.), Second lien 2                      
Principal Amount or Par Value [3],[18],[25] $ 1,429   $ 1,429                
Spread [3],[25] 6.75%   6.75%     6.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [3],[25] $ 1,265   $ 1,265                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 1,710   1,710                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Drawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] $ 601   $ 601                
Spread [1],[2],[3] 5.25%   5.25%     5.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 601   $ 601                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Drawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] $ 387   $ 387                
Spread [1],[2],[3] 5.25%   5.25%     5.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 387   $ 387                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value 2,924 [1],[2],[3],[18]   2,924 [1],[2],[3],[18]   3,312 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         2,095            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                      
Principal Amount or Par Value $ 37,000 [2],[18],[21],[22]   $ 37,000 [2],[18],[21],[22]   $ 33,356 [15],[19],[23],[24]            
Spread 5.25% [2],[21],[22]   5.25% [2],[21],[22]   5.25% [15],[23],[24] 5.25% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 33,356                
Fair value, ending balance $ 37,000 [2],[21],[22]   37,000 [2],[21],[22]   $ 33,356 [15],[23],[24]            
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                      
Principal Amount or Par Value $ 4,054 [2],[3],[18],[25]   $ 4,054 [2],[3],[18],[25]   $ 4,075 [15],[16],[19],[26]            
Spread 5.25% [2],[3],[25]   5.25% [2],[3],[25]   5.25% [15],[16],[26] 5.25% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 4,075                
Fair value, ending balance $ 4,054 [2],[3],[25]   4,054 [2],[3],[25]   $ 4,075 [15],[16],[26]            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 2,145   2,145                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18],[25] $ 715   $ 715                
Spread [1],[2],[3],[25] 5.50%   5.50%     5.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25] $ 715   $ 715                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 1,001            
Spread [15],[16],[20]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     1,001                
Fair value, ending balance [15],[16],[20]         $ 1,001            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 342            
Spread [15],[16],[20]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     342                
Fair value, ending balance [15],[16],[20]         $ 342            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         3,360            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         1,859            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                      
Principal Amount or Par Value $ 17,087 [2],[18],[21],[22]   $ 17,087 [2],[18],[21],[22]   $ 17,176 [15],[19],[23],[24]            
Spread 5.50% [2],[21],[22]   5.50% [2],[21],[22]   5.50% [15],[23],[24] 5.50% [2],[21],[22] 5.50% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 17,176                
Fair value, ending balance $ 17,087 [2],[21],[22]   17,087 [2],[21],[22]   $ 17,176 [15],[23],[24]            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                      
Principal Amount or Par Value $ 12,298 [2],[3],[18],[25]   $ 12,298 [2],[3],[18],[25]   $ 12,020 [15],[16],[19],[26]            
Spread 5.50% [2],[3],[25]   5.50% [2],[3],[25]   5.50% [15],[16],[26] 5.50% [2],[3],[25] 5.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 12,020                
Fair value, ending balance $ 12,298 [2],[3],[25]   12,298 [2],[3],[25]   $ 12,020 [15],[16],[26]            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                      
Principal Amount or Par Value $ 977 [2],[3],[18],[25]   $ 977 [2],[3],[18],[25]   $ 80 [15],[16],[19]            
Spread 5.50% [2],[3],[25]   5.50% [2],[3],[25]   5.50% [15],[16] 5.50% [2],[3],[25] 5.50% [15],[16]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     $ 80                
Fair value, ending balance $ 977 [2],[3],[25]   977 [2],[3],[25]   $ 80 [15],[16]            
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 4                      
Principal Amount or Par Value [2],[3],[18] $ 79   $ 79                
Spread [2],[3] 5.50%   5.50%     5.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] $ 79   $ 79                
Investment, Identifier [Axis]: Foundational Education Group, Inc., First lien                      
Principal Amount or Par Value [18],[22] $ 6,400   $ 6,400                
Spread [22] 3.75%   3.75%     3.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [22] $ 5,851   $ 5,851                
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                      
Principal Amount or Par Value $ 22,500 [2],[18],[40]   $ 22,500 [2],[18],[40]   $ 22,500 [15],[19],[39]            
Spread 6.50% [2],[40]   6.50% [2],[40]   6.50% [15],[39] 6.50% [2],[40] 6.50% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 22,500                
Fair value, ending balance $ 22,500 [2],[40]   22,500 [2],[40]   $ 22,500 [15],[39]            
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 7,009            
Spread [15],[23],[24]         6.50%   6.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     7,009                
Fair value, ending balance [15],[23],[24]         $ 7,009            
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                      
Principal Amount or Par Value [2],[3],[18],[25] $ 10,965   $ 10,965                
Spread [2],[3],[25] 6.50%   6.50%     6.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 10,965   $ 10,965                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 3,951   3,951                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         3,951            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                      
Principal Amount or Par Value $ 40,110 [2],[18],[21],[22]   $ 40,110 [2],[18],[21],[22]   $ 40,312 [15],[19],[23],[24]            
Spread 4.75% [2],[21],[22]   4.75% [2],[21],[22]   4.75% [15],[23],[24] 4.75% [2],[21],[22] 4.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 40,312                
Fair value, ending balance $ 40,110 [2],[21],[22]   40,110 [2],[21],[22]   $ 40,312 [15],[23],[24]            
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                      
Principal Amount or Par Value $ 21,341 [2],[18],[40]   $ 21,341 [2],[18],[40]   $ 21,448 [15],[19],[39]            
Spread 4.75% [2],[40]   4.75% [2],[40]   4.75% [15],[39] 4.75% [2],[40] 4.75% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 21,448                
Fair value, ending balance $ 21,341 [2],[40]   21,341 [2],[40]   $ 21,448 [15],[39]            
Investment, Identifier [Axis]: GEDC Equity, LLC, Participation Interest                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     50                
Fair value, ending balance 50 [2],[3]   50 [2],[3]   50 [15],[16]            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 319            
Spread [15],[16],[20]         5.25%   5.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     319                
Fair value, ending balance [15],[16],[20]         $ 319            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] $ 451   $ 451                
Spread [1],[2],[3] 5.25%   5.25%     5.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 448   $ 448                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] $ 357   $ 357                
Spread [1],[2],[3] 5.25%   5.25%     5.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 355   $ 355                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value 759 [1],[2],[3],[18]   759 [1],[2],[3],[18]   1,120 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance (4) [1],[2],[3]   (4) [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value 4,464 [1],[2],[3],[18]   4,464 [1],[2],[3],[18]   4,821 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance (22) [1],[2],[3]   (22) [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                      
Principal Amount or Par Value $ 25,212 [2],[18],[21],[22]   $ 25,212 [2],[18],[21],[22]   $ 34,719 [15],[19],[23],[24]            
Spread 5.25% [2],[21],[22]   5.25% [2],[21],[22]   5.25% [15],[23],[24] 5.25% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 34,719                
Fair value, ending balance $ 25,086 [2],[21],[22]   25,086 [2],[21],[22]   $ 34,719 [15],[23],[24]            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                      
Principal Amount or Par Value $ 21,185 [2],[18],[40]   $ 21,185 [2],[18],[40]   $ 21,297 [15],[19],[39]            
Spread 5.25% [2],[40]   5.25% [2],[40]   5.25% [15],[39] 5.25% [2],[40] 5.25% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 21,297                
Fair value, ending balance $ 21,080 [2],[40]   21,080 [2],[40]   $ 21,297 [15],[39]            
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 3                      
Principal Amount or Par Value $ 2,894 [2],[3],[18],[25]   $ 2,894 [2],[3],[18],[25]   $ 2,909 [15],[16],[19],[26]            
Spread 5.25% [2],[3],[25]   5.25% [2],[3],[25]   5.25% [15],[16],[26] 5.25% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 2,909                
Fair value, ending balance $ 2,879 [2],[3],[25]   2,879 [2],[3],[25]   $ 2,909 [15],[16],[26]            
Investment, Identifier [Axis]: Galway Borrower LLC, First lien                      
Principal Amount or Par Value $ 1,084 [2],[18],[21],[22]   $ 1,084 [2],[18],[21],[22]   $ 1,090 [15],[19],[23],[24]            
Spread 4.50% [2],[21],[22]   4.50% [2],[21],[22]   4.50% [15],[23],[24] 4.50% [2],[21],[22] 4.50% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 1,080                
Fair value, ending balance $ 1,074 [2],[21],[22]   1,074 [2],[21],[22]   $ 1,080 [15],[23],[24]            
Investment, Identifier [Axis]: Galway Borrower LLC, First lien (3)(11)(13)(16) - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18],[25] $ 1,796   $ 1,796                
Spread [1],[2],[3],[25] 4.50%   4.50%     4.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25] $ 1,778   $ 1,778                
Investment, Identifier [Axis]: Galway Borrower LLC, First lien - Drawn                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 1,806            
Spread [15],[16],[20]         4.50%   4.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     1,788                
Fair value, ending balance [15],[16],[20]         $ 1,788            
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien                      
Principal Amount or Par Value $ 17,811 [2],[18],[21],[22]   $ 17,811 [2],[18],[21],[22]   $ 17,901 [15],[19],[23],[24]            
Spread 3.75% [2],[21],[22]   3.75% [2],[21],[22]   4.75% [15],[23],[24] 3.75% [2],[21],[22] 4.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 17,856                
Fair value, ending balance $ 17,811 [2],[21],[22]   17,811 [2],[21],[22]   $ 17,856 [15],[23],[24]            
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien (3)(13)(16) - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 1,682   1,682                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien (3)(13)(16) - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 4,038   4,038                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Drawn                      
Principal Amount or Par Value $ 445 [1],[2],[3],[18]   $ 445 [1],[2],[3],[18]   $ 448 [15],[16],[19],[20]            
Spread 3.75% [1],[2],[3]   3.75% [1],[2],[3]   4.75% [15],[16],[20] 3.75% [1],[2],[3] 4.75% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 446                
Fair value, ending balance $ 445 [1],[2],[3]   445 [1],[2],[3]   $ 446 [15],[16],[20]            
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         1,682            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (4)                
Fair value, ending balance [15],[16],[20]         (4)            
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         4,038            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (10)                
Fair value, ending balance [15],[16],[20]         (10)            
Investment, Identifier [Axis]: Greenway Health, LLC, First lien                      
Principal Amount or Par Value $ 6,270 [2],[3],[18],[25]   $ 6,270 [2],[3],[18],[25]   $ 6,302 [15],[16],[19],[26]            
Spread 6.75% [2],[3],[25]   6.75% [2],[3],[25]   6.75% [15],[16],[26] 6.75% [2],[3],[25] 6.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 6,302                
Fair value, ending balance $ 6,270 [2],[3],[25]   6,270 [2],[3],[25]   $ 6,302 [15],[16],[26]            
Investment, Identifier [Axis]: Groundworks, LLC, First lien                      
Principal Amount or Par Value [19],[28]         $ 18,908            
Spread [28]         3.25%   3.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [28]     19,034                
Fair value, ending balance [28]         $ 19,034            
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Drawn                      
Principal Amount or Par Value [19],[20],[28]         $ 557            
Spread [20],[28]         3.25%   3.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [20],[28]     560                
Fair value, ending balance [20],[28]         $ 560            
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn                      
Principal Amount or Par Value [19],[20],[28]         2,938            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [20],[28]     20                
Fair value, ending balance [20],[28]         $ 20            
Investment, Identifier [Axis]: HBWM Holdings, LLC, Common units                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[50],[51] 9,532   9,532                
Investment, Identifier [Axis]: HBWM Holdings, LLC, Ordinary shares                      
Spread [15],[52]         4.00%   4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[52]     9,532                
Fair value, ending balance [15],[52]         $ 9,532            
Investment, Identifier [Axis]: HBWM Holdings, LLC.                      
Principal Amount or Par Value 4,750   4,750                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                      
Principal Amount or Par Value $ 22,500 [18],[40]   $ 22,500 [18],[40]   $ 22,500 [19],[39]            
Spread 6.75% [40]   6.75% [40]   6.75% [39] 6.75% [40] 6.75% [39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [39]     $ 14,513                
Fair value, ending balance $ 17,044 [40]   17,044 [40]   $ 14,513 [39]            
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                      
Principal Amount or Par Value $ 4,208 [18],[21],[22]   $ 4,208 [18],[21],[22]   $ 4,208 [19],[23],[24]            
Spread 6.75% [21],[22]   6.75% [21],[22]   6.75% [23],[24] 6.75% [21],[22] 6.75% [23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [23],[24]     $ 2,714                
Fair value, ending balance $ 3,188 [21],[22]   3,188 [21],[22]   $ 2,714 [23],[24]            
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien                      
Principal Amount or Par Value $ 5,044 [2],[3],[18],[25]   $ 5,044 [2],[3],[18],[25]   $ 5,069 [15],[16],[19],[26]            
Spread 5.25% [2],[3],[25]   5.25% [2],[3],[25]   5.25% [15],[16],[26] 5.25% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 5,069                
Fair value, ending balance $ 5,044 [2],[3],[25]   5,044 [2],[3],[25]   $ 5,069 [15],[16],[26]            
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien - Undrawn                      
Principal Amount or Par Value 1,229 [1],[2],[3],[18]   1,229 [1],[2],[3],[18]   1,229 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien                      
Principal Amount or Par Value $ 3,788 [2],[3],[18],[25]   $ 3,788 [2],[3],[18],[25]   $ 3,808 [15],[16],[19],[26]            
Spread 4.50% [2],[3],[25]   4.50% [2],[3],[25]   4.50% [15],[16],[26] 4.50% [2],[3],[25] 4.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 3,808                
Fair value, ending balance $ 3,788 [2],[3],[25]   3,788 [2],[3],[25]   $ 3,808 [15],[16],[26]            
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Drawn                      
Principal Amount or Par Value $ 4,063 [1],[2],[3],[18]   $ 4,063 [1],[2],[3],[18]   $ 2,313 [15],[16],[19],[20]            
Spread 4.75% [1],[2],[3]   4.75% [1],[2],[3]   4.75% [15],[16],[20] 4.75% [1],[2],[3] 4.75% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 2,313                
Fair value, ending balance $ 4,063 [1],[2],[3]   4,063 [1],[2],[3]   $ 2,313 [15],[16],[20]            
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Undrawn                      
Principal Amount or Par Value 3,907 [1],[2],[3],[18]   3,907 [1],[2],[3],[18]   5,676 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company, First lien                      
Principal Amount or Par Value $ 14,410 [3],[18],[25]   $ 14,410 [3],[18],[25]   $ 14,484 [16],[19],[26]            
Spread 5.25% [3],[25]   5.25% [3],[25]   5.25% [16],[26] 5.25% [3],[25] 5.25% [16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [16],[26]     $ 14,291                
Fair value, ending balance $ 14,189 [3],[25]   14,189 [3],[25]   $ 14,291 [16],[26]            
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 3,780   3,780                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         3,780            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                      
Principal Amount or Par Value $ 32,635 [2],[18],[21],[22]   $ 32,635 [2],[18],[21],[22]   $ 32,799 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 32,799                
Fair value, ending balance $ 32,635 [2],[21],[22]   32,635 [2],[21],[22]   $ 32,799 [15],[23],[24]            
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                      
Principal Amount or Par Value $ 2,529 [2],[3],[18],[25]   $ 2,529 [2],[3],[18],[25]   $ 2,542 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   5.00% [15],[16],[26] 5.00% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 2,542                
Fair value, ending balance $ 2,529 [2],[3],[25]   2,529 [2],[3],[25]   $ 2,542 [15],[16],[26]            
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien                      
Principal Amount or Par Value $ 8,696 [2],[3],[18],[25]   $ 8,696 [2],[3],[18],[25]   $ 8,696 [15],[16],[19],[26]            
Spread 5.75% [2],[3],[25]   5.75% [2],[3],[25]   6.50% [15],[16],[26] 5.75% [2],[3],[25] 6.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 8,696                
Fair value, ending balance $ 8,696 [2],[3],[25]   8,696 [2],[3],[25]   $ 8,696 [15],[16],[26]            
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 828   828                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         828            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                      
Principal Amount or Par Value [15],[19],[28]         $ 15,091            
Spread [15],[28]         6.75%   6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     15,091                
Fair value, ending balance [15],[28]         $ 15,091            
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                      
Principal Amount or Par Value [15],[16],[19],[26]         $ 2,012            
Spread [15],[16],[26]         6.75%   6.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     2,012                
Fair value, ending balance [15],[16],[26]         $ 2,012            
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 3,827   3,827                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         3,827            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                      
Principal Amount or Par Value $ 18,372 [2],[18],[21],[22]   $ 18,372 [2],[18],[21],[22]   $ 18,372 [15],[19],[23],[24]            
Spread 5.75% [2],[21],[22]   5.75% [2],[21],[22]   5.75% [15],[23],[24] 5.75% [2],[21],[22] 5.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 18,372                
Fair value, ending balance $ 18,372 [2],[21],[22]   18,372 [2],[21],[22]   $ 18,372 [15],[23],[24]            
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                      
Principal Amount or Par Value $ 7,724 [2],[3],[18],[25]   $ 7,724 [2],[3],[18],[25]   $ 7,764 [15],[16],[19],[26]            
Spread 5.75% [2],[3],[25]   5.75% [2],[3],[25]   5.75% [15],[16],[26] 5.75% [2],[3],[25] 5.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 7,764                
Fair value, ending balance $ 7,724 [2],[3],[25]   7,724 [2],[3],[25]   $ 7,764 [15],[16],[26]            
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                      
Principal Amount or Par Value $ 16,953 [2],[3],[18]   $ 16,953 [2],[3],[18]   $ 16,953 [15],[16],[19]            
Spread 7.50% [2],[3]   7.50% [2],[3]   7.50% [15],[16] 7.50% [2],[3] 7.50% [15],[16]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     $ 16,953                
Fair value, ending balance $ 16,953 [2],[3]   16,953 [2],[3]   $ 16,953 [15],[16]            
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                      
Principal Amount or Par Value [15],[16],[19],[26],[33]         7,091            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26],[33]     6,331                
Fair value, ending balance [15],[16],[26],[33]         $ 6,331            
Investment, Identifier [Axis]: Ivy Hill Middle Market Credit Fund, Ltd, Structured Finance Obligations                      
Principal Amount or Par Value [2],[3],[18],[32] $ 3,232   $ 3,232                
Spread 7.00% [2],[3],[32]   7.00% [2],[3],[32]   7.00% [16],[33] 7.00% [2],[3],[32] 7.00% [16],[33]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [16],[33]     $ 3,232                
Fair value, ending balance $ 3,249 [2],[3],[32]   3,249 [2],[3],[32]   $ 3,232 [16],[33]            
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 1,568   1,568                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (68)   (68)                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                      
Principal Amount or Par Value $ 19 [1],[2],[3],[18]   $ 19 [1],[2],[3],[18]   $ 19 [15],[16],[19],[20]            
Spread 5.75% [1],[2],[3]   5.75% [1],[2],[3]   5.75% [15],[16],[20] 5.75% [1],[2],[3] 5.75% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 18                
Fair value, ending balance $ 18 [1],[2],[3]   18 [1],[2],[3]   $ 18 [15],[16],[20]            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         1,568            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (47)                
Fair value, ending balance [15],[16],[20]         (47)            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                      
Principal Amount or Par Value $ 6,792 [2],[3],[18],[25]   $ 6,792 [2],[3],[18],[25]   $ 6,827 [15],[16],[19],[26]            
Spread 5.50% [2],[3],[25]   5.50% [2],[3],[25]   5.50% [15],[16],[26] 5.50% [2],[3],[25] 5.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 6,570                
Fair value, ending balance $ 6,473 [2],[3],[25]   6,473 [2],[3],[25]   $ 6,570 [15],[16],[26]            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                      
Principal Amount or Par Value $ 1,143 [2],[3],[18],[25]   $ 1,143 [2],[3],[18],[25]   $ 1,149 [15],[16],[19],[26]            
Spread 5.50% [2],[3],[25]   5.50% [2],[3],[25]   5.50% [15],[16],[26] 5.50% [2],[3],[25] 5.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 1,106                
Fair value, ending balance $ 1,089 [2],[3],[25]   1,089 [2],[3],[25]   $ 1,106 [15],[16],[26]            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 3                      
Principal Amount or Par Value $ 778 [2],[3],[18],[25]   $ 778 [2],[3],[18],[25]   $ 782 [15],[16],[19],[26]            
Spread 5.50% [2],[3],[25]   5.50% [2],[3],[25]   5.50% [15],[16],[26] 5.50% [2],[3],[25] 5.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 752                
Fair value, ending balance $ 742 [2],[3],[25]   742 [2],[3],[25]   $ 752 [15],[16],[26]            
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 1                      
Principal Amount or Par Value [15],[16],[19],[20],[26]         $ 973            
Spread [15],[16],[20],[26]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26]     973                
Fair value, ending balance [15],[16],[20],[26]         $ 973            
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 751            
Spread [15],[16],[20]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     751                
Fair value, ending balance [15],[16],[20]         $ 751            
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         2,865            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         2,888            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Kaseya Inc., First lien 1                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 64,124            
Spread [15],[23],[24]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     64,124                
Fair value, ending balance [15],[23],[24]         $ 64,124            
Investment, Identifier [Axis]: Kaseya Inc., First lien 2                      
Principal Amount or Par Value [15],[16],[19],[26]         $ 238            
Spread [15],[16],[26]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     238                
Fair value, ending balance [15],[16],[26]         $ 238            
Investment, Identifier [Axis]: Kaseya, Inc., First lien                      
Number of investments held | investment         2   2        
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18],[25] $ 1,799   $ 1,799                
Spread [1],[2],[3],[25] 4.50%   4.50%     4.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25] $ 1,799   $ 1,799                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         $ 1,799            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 1                      
Principal Amount or Par Value $ 14,554 [2],[18],[40]   $ 14,554 [2],[18],[40]   $ 14,635 [15],[19],[39]            
Spread 4.50% [2],[40]   4.50% [2],[40]   4.50% [15],[39] 4.50% [2],[40] 4.50% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 14,635                
Fair value, ending balance $ 14,554 [2],[40]   14,554 [2],[40]   $ 14,635 [15],[39]            
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 2                      
Principal Amount or Par Value $ 1,254 [2],[18],[40]   $ 1,254 [2],[18],[40]   $ 2,268 [15],[19],[39]            
Spread 4.50% [2],[40]   4.50% [2],[40]   4.50% [15],[39] 4.50% [2],[40] 4.50% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 2,268                
Fair value, ending balance $ 1,254 [2],[40]   1,254 [2],[40]   $ 2,268 [15],[39]            
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien                      
Principal Amount or Par Value $ 3,492 [2],[18],[21],[22]   $ 3,492 [2],[18],[21],[22]   $ 3,509 [15],[19],[23],[24]            
Spread 5.25% [2],[21],[22]   5.25% [2],[21],[22]   5.25% [15],[23],[24] 5.25% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 3,509                
Fair value, ending balance $ 3,492 [2],[21],[22]   3,492 [2],[21],[22]   $ 3,509 [15],[23],[24]            
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 1,398   1,398                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 468   468                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Drawn                      
Principal Amount or Par Value $ 161 [1],[2],[3],[18]   $ 161 [1],[2],[3],[18]   $ 162 [15],[16],[19],[20]            
Spread 5.25% [1],[2],[3]   5.25% [1],[2],[3]   5.25% [15],[16],[20] 5.25% [1],[2],[3] 5.25% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 162                
Fair value, ending balance $ 161 [1],[2],[3]   161 [1],[2],[3]   $ 162 [15],[16],[20]            
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         1,398            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         468            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc., Preferred shares                      
Principal Amount or Par Value 14,237   14,237                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[53]     21,010                
Fair value, ending balance 14,237 [2],[3],[54]   14,237 [2],[3],[54]   21,010 [15],[16],[53]            
Investment, Identifier [Axis]: LSCS Holdings, Inc., First lien                      
Principal Amount or Par Value [18],[21],[22] $ 5,168   $ 5,168                
Spread [21],[22] 4.50%   4.50%     4.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [21],[22] $ 5,081   $ 5,081                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien                      
Principal Amount or Par Value $ 6,178 [2],[18],[40]   $ 6,178 [2],[18],[40]   $ 6,124 [15],[19],[39]            
Spread 2.75% [2],[35],[40]   2.75% [2],[35],[40]   2.75% [15],[31],[39] 2.75% [2],[35],[40] 2.75% [15],[31],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 6,062                
Fair value, ending balance $ 6,116 [2],[40]   6,116 [2],[40]   $ 6,062 [15],[39]            
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Drawn                      
Principal Amount or Par Value $ 286 [1],[2],[3],[18]   $ 286 [1],[2],[3],[18]   $ 72 [15],[16],[19],[20]            
Spread 5.00% [1],[2],[3]   5.00% [1],[2],[3]   5.00% [15],[16],[20] 5.00% [1],[2],[3] 5.00% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 71                
Fair value, ending balance $ 283 [1],[2],[3]   283 [1],[2],[3]   $ 71 [15],[16],[20]            
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value 358 [1],[2],[18],[40]   358 [1],[2],[18],[40]   358 [15],[19],[20],[39]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[39]     (4)                
Fair value, ending balance (4) [1],[2],[40]   (4) [1],[2],[40]   (4) [15],[20],[39]            
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value 429 [1],[2],[3],[18]   429 [1],[2],[3],[18]   644 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (6)                
Fair value, ending balance (4) [1],[2],[3]   (4) [1],[2],[3]   (6) [15],[16],[20]            
Investment, Identifier [Axis]: Logrhythm, Inc. First lien                      
Principal Amount or Par Value [2],[3],[18] $ 4,196   $ 4,196                
Spread [2],[3] 7.50%   7.50%     7.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] $ 4,080   $ 4,080                
Investment, Identifier [Axis]: Logrhythm, Inc., First lien                      
Principal Amount or Par Value [15],[16],[19],[26]         $ 4,196            
Spread [15],[16],[26]         7.50%   7.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     4,196                
Fair value, ending balance [15],[16],[26]         $ 4,196            
Investment, Identifier [Axis]: Logrhythm, Inc., First lien - Undrawn                      
Principal Amount or Par Value 420 [1],[2],[3],[18]   420 [1],[2],[3],[18]   420 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance (12) [1],[2],[3]   (12) [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Low Voltage Holdings Inc., First lien                      
Principal Amount or Par Value [2],[3],[18],[25] $ 16,902   $ 16,902                
Spread [2],[3],[25] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 16,839   $ 16,839                
Investment, Identifier [Axis]: Low Voltage Holdings Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 5,257   5,257                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Low Voltage Holdings Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 819   819                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (3)   (3)                
Investment, Identifier [Axis]: Low Voltage Holdings Inc., First lien - Undrawn 3                      
Principal Amount or Par Value [1],[2],[3],[18] 2,317   2,317                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (9)   (9)                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 1,891   1,891                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Drawn                      
Principal Amount or Par Value $ 111 [1],[2],[3],[18]   $ 111 [1],[2],[3],[18]   $ 111 [15],[16],[19],[20]            
Spread 4.75% [1],[2],[3]   4.75% [1],[2],[3]   4.75% [15],[16],[20] 4.75% [1],[2],[3] 4.75% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 111                
Fair value, ending balance $ 111 [1],[2],[3]   111 [1],[2],[3]   $ 111 [15],[16],[20]            
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         1,891            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                      
Principal Amount or Par Value $ 21,317 [2],[18],[40]   $ 21,317 [2],[18],[40]   $ 21,430 [15],[19],[39]            
Spread 4.75% [2],[40]   4.75% [2],[40]   4.75% [15],[39] 4.75% [2],[40] 4.75% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 21,430                
Fair value, ending balance $ 21,317 [2],[40]   21,317 [2],[40]   $ 21,430 [15],[39]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                      
Principal Amount or Par Value $ 7,551 [2],[3],[18],[25]   $ 7,551 [2],[3],[18],[25]   $ 7,591 [15],[16],[19],[26]            
Spread 4.75% [2],[3],[25]   4.75% [2],[3],[25]   4.75% [15],[16],[26] 4.75% [2],[3],[25] 4.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 7,591                
Fair value, ending balance $ 7,551 [2],[3],[25]   7,551 [2],[3],[25]   $ 7,591 [15],[16],[26]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                      
Principal Amount or Par Value $ 4,498 [2],[18],[21],[22]   $ 4,498 [2],[18],[21],[22]   $ 4,521 [15],[19],[23],[24]            
Spread 4.75% [2],[21],[22]   4.75% [2],[21],[22]   4.75% [15],[23],[24] 4.75% [2],[21],[22] 4.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 4,521                
Fair value, ending balance $ 4,498 [2],[21],[22]   4,498 [2],[21],[22]   $ 4,521 [15],[23],[24]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                      
Principal Amount or Par Value $ 3,091 [2],[18],[21],[22]   $ 3,091 [2],[18],[21],[22]   $ 3,107 [15],[19],[23],[24]            
Spread 4.75% [2],[21],[22]   4.75% [2],[21],[22]   4.75% [15],[23],[24] 4.75% [2],[21],[22] 4.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 3,107                
Fair value, ending balance $ 3,091 [2],[21],[22]   3,091 [2],[21],[22]   $ 3,107 [15],[23],[24]            
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                      
Principal Amount or Par Value $ 789 [2],[3],[18],[25]   $ 789 [2],[3],[18],[25]   $ 793 [15],[16],[19],[26]            
Spread 4.75% [2],[3],[25]   4.75% [2],[3],[25]   4.75% [15],[16],[26] 4.75% [2],[3],[25] 4.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 793                
Fair value, ending balance $ 789 [2],[3],[25]   789 [2],[3],[25]   $ 793 [15],[16],[26]            
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 256   256                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (1)   (1)                
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 3,692   3,692                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (18)   (18)                
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC, First lien- Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 52   $ 52                
Spread [1],[2],[3] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 52   $ 52                
Investment, Identifier [Axis]: Michael Baker International, LLC, First lien                      
Principal Amount or Par Value [16],[19],[26]         $ 4,892            
Spread [16],[26]         4.75%   4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [16],[26]     4,910                
Fair value, ending balance [16],[26]         $ 4,910            
Investment, Identifier [Axis]: Model N, Inc., First lien                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 44,218            
Spread [15],[23],[24]         5.00%   5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     43,997                
Fair value, ending balance [15],[23],[24]         $ 43,997            
Investment, Identifier [Axis]: Model N, Inc., First lien                      
Principal Amount or Par Value [2],[18],[21],[22] $ 43,996   $ 43,996                
Spread [2],[21],[22] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[21],[22] $ 43,996   $ 43,996                
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 9,047   9,047                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 4,825   4,825                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         4,825            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (24)                
Fair value, ending balance [15],[16],[20]         (24)            
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         9,047            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (45)                
Fair value, ending balance [15],[16],[20]         (45)            
Investment, Identifier [Axis]: NC Topco, LLC, First lien                      
Principal Amount or Par Value $ 5,891 [2],[18],[21],[22]   $ 5,891 [2],[18],[21],[22]   $ 5,853 [15],[19],[23],[24]            
Spread 4.50% [2],[21],[22]   4.50% [2],[21],[22]   2.50% [15],[23],[24],[31] 4.50% [2],[21],[22] 2.50% [15],[23],[24],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 5,824                
Fair value, ending balance $ 5,862 [2],[21],[22]   5,862 [2],[21],[22]   $ 5,824 [15],[23],[24]            
Investment, Identifier [Axis]: NC Topco, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value 669 [1],[2],[3],[18]   669 [1],[2],[3],[18]   669 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (3)                
Fair value, ending balance (3) [1],[2],[3]   (3) [1],[2],[3]   (3) [15],[16],[20]            
Investment, Identifier [Axis]: NC Topco, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value 1,672 [1],[2],[3],[18]   1,672 [1],[2],[3],[18]   1,672 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (8)                
Fair value, ending balance (8) [1],[2],[3]   (8) [1],[2],[3]   (8) [15],[16],[20]            
Investment, Identifier [Axis]: NHME Holdings Corp., Ordinary shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[55]     0                
Fair value, ending balance 0 [2],[3],[56]   0 [2],[3],[56]   0 [15],[16],[55]            
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[55]     0                
Fair value, ending balance 0 [2],[3],[56]   0 [2],[3],[56]   0 [15],[16],[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 [15],[33],[57]     322                
Fair value, ending balance 393 [2],[32],[58]   393 [2],[32],[58]   322 [15],[33],[57]            
Investment, Identifier [Axis]: NM NL Holdings, L.P., Membership interest                      
Principal Amount or Par Value [2],[18],[32],[58] 0   0                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[33],[57]     104,512                
Fair value, ending balance 104,973 [2],[32],[58]   104,973 [2],[32],[58]   104,512 [15],[33],[57]            
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[57]     9,960                
Fair value, ending balance 8,874 [2],[58]   8,874 [2],[58]   9,960 [15],[57]            
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                      
Principal Amount or Par Value $ 19,259 [2],[3],[18],[25]   $ 19,259 [2],[3],[18],[25]   $ 19,259 [15],[16],[19],[26]            
Spread 6.09% [2],[3],[25]   6.09% [2],[3],[25]   6.09% [15],[16],[26] 6.09% [2],[3],[25] 6.09% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 19,259                
Fair value, ending balance $ 19,259 [2],[3],[25]   19,259 [2],[3],[25]   $ 19,259 [15],[16],[26]            
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                      
Principal Amount or Par Value $ 5,012 [2],[3],[18],[25]   $ 5,012 [2],[3],[18],[25]   $ 5,012 [15],[16],[19],[26]            
Spread 6.09% [2],[3],[25]   6.09% [2],[3],[25]   6.09% [15],[16],[26] 6.09% [2],[3],[25] 6.09% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 5,012                
Fair value, ending balance $ 5,012 [2],[3],[25]   5,012 [2],[3],[25]   $ 5,012 [15],[16],[26]            
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 3                      
Principal Amount or Par Value $ 4,913 [2],[18],[21],[22]   $ 4,913 [2],[18],[21],[22]   $ 4,913 [15],[19],[23],[24]            
Spread 6.09% [2],[21],[22]   6.09% [2],[21],[22]   6.09% [15],[23],[24] 6.09% [2],[21],[22] 6.09% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 4,913                
Fair value, ending balance $ 4,913 [2],[21],[22]   4,913 [2],[21],[22]   $ 4,913 [15],[23],[24]            
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 4                      
Principal Amount or Par Value [2],[3],[18],[25] $ 4,706   $ 4,706                
Spread [2],[3],[25] 6.24%   6.24%     6.24%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 4,706   $ 4,706                
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC, Membership interest                      
Principal Amount or Par Value [2],[3],[18],[32] 0   0                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[33]     160,000                
Fair value, ending balance 160,000 [2],[3],[32]   160,000 [2],[3],[32]   160,000 [15],[16],[33]            
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC, Membership interest                      
Principal Amount or Par Value [2],[3],[18],[32] 0   0                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[33]     112,400                
Fair value, ending balance 112,400 [2],[3],[32]   112,400 [2],[3],[32]   112,400 [15],[16],[33]            
Investment, Identifier [Axis]: National HME, Inc., Second lien                      
Principal Amount or Par Value 8,281 [2],[3],[18],[56]   8,281 [2],[3],[18],[56]   8,281 [15],[16],[19],[55]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[55]     3,000                
Fair value, ending balance $ 3,000 [2],[3],[56]   $ 3,000 [2],[3],[56]   $ 3,000 [15],[16],[55]            
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%        
Spread 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%        
Spread 6.00%   6.00%   6.00% 6.00% 6.00%        
Investment, Identifier [Axis]: Nelipak Holding Company First lien 1                      
Principal Amount or Par Value         $ 17,109            
Investment, Identifier [Axis]: Nelipak Holding Company First lien 2                      
Principal Amount or Par Value         406            
Investment, Identifier [Axis]: Nelipak Holding Company First lien 3                      
Principal Amount or Par Value         6,638            
Investment, Identifier [Axis]: Nelipak Holding Company First lien 4                      
Principal Amount or Par Value         833            
Investment, Identifier [Axis]: Nelipak Holding Company, Drawn Revolver                      
Principal Amount or Par Value $ 92   $ 92                
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 3,501   3,501                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 2                      
Principal Amount or Par Value | € [1],[2],[3],[18],[25],[59]           € 6,411          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25],[59] 0   0                
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 3                      
Principal Amount or Par Value [1],[2],[3],[18] 1,071   1,071                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 4                      
Principal Amount or Par Value | € [1],[2],[3],[18],[25],[59]           € 1,118          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25],[59] 0   0                
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Drawn 1                      
Principal Amount or Par Value $ 1,541 [1],[2],[3],[18],[25],[59]   $ 1,541 [1],[2],[3],[18],[25],[59]   $ 1,097 [15],[16],[19],[20],[26],[60]            
Spread 5.50% [1],[2],[3],[25],[59]   5.50% [1],[2],[3],[25],[59]   5.50% [15],[16],[20],[26],[60] 5.50% [1],[2],[3],[25],[59] 5.50% [15],[16],[20],[26],[60]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26],[60]     $ 1,097                
Fair value, ending balance $ 1,541 [1],[2],[3],[25],[59]   $ 1,541 [1],[2],[3],[25],[59]   $ 1,097 [15],[16],[20],[26],[60]            
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Drawn 2                      
Principal Amount or Par Value         $ 392 [15],[16],[19],[20] € 78 [1],[2],[3],[18]          
Spread 5.50% [1],[2],[3]   5.50% [1],[2],[3]   5.50% [15],[16],[20] 5.50% [1],[2],[3] 5.50% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 405                
Fair value, ending balance $ 93 [1],[2],[3]   93 [1],[2],[3]   $ 405 [15],[16],[20]            
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         3,501            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20],[26],[60]         6,411            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26],[60]     0                
Fair value, ending balance [15],[16],[20],[26],[60]         0            
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 3                      
Principal Amount or Par Value [15],[16],[19],[20],[26],[60]         804            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26],[60]     0                
Fair value, ending balance [15],[16],[20],[26],[60]         0            
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 4                      
Principal Amount or Par Value [15],[16],[19],[20]         1,515            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         $ 0            
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 1                      
Principal Amount or Par Value $ 19,383   $ 19,383     € 16,440 [2],[3],[18],[25],[59] € 16,523 [15],[16],[19],[26],[60]        
Spread 5.50% [2],[3],[25],[59]   5.50% [2],[3],[25],[59]   5.50% [15],[16],[26],[60] 5.50% [2],[3],[25],[59] 5.50% [15],[16],[26],[60]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26],[60]     $ 17,108                
Fair value, ending balance $ 19,386 [2],[3],[25],[59]   19,386 [2],[3],[25],[59]   $ 17,108 [15],[16],[26],[60]            
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 2                      
Principal Amount or Par Value $ 8,978 [2],[18],[21],[22]   $ 8,978 [2],[18],[21],[22]   $ 9,023 [15],[19],[23],[24]            
Spread 5.50% [2],[21],[22]   5.50% [2],[21],[22]   5.50% [15],[23],[24] 5.50% [2],[21],[22] 5.50% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 9,023                
Fair value, ending balance $ 8,978 [2],[21],[22]   8,978 [2],[21],[22]   $ 9,023 [15],[23],[24]            
Investment, Identifier [Axis]: Nelipak Holding Company, Undrawn Delayed Draw Term Loan                      
Principal Amount or Par Value 7,558   7,558                
Investment, Identifier [Axis]: Nelipak Holding Company, Undrawn Revolver                      
Principal Amount or Par Value 1,318   1,318                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                      
Principal Amount or Par Value 48,905 [2],[18],[22]   48,905 [2],[18],[22]   46,068 [15],[19],[24]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     46,068                
Fair value, ending balance 48,905 [2],[22]   48,905 [2],[22]   46,068 [15],[24]            
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                      
Principal Amount or Par Value 38,682 [2],[3],[18],[25]   38,682 [2],[3],[18],[25]   33,155 [15],[16],[19],[26]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     33,155                
Fair value, ending balance 38,682 [2],[3],[25]   38,682 [2],[3],[25]   33,155 [15],[16],[26]            
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                      
Principal Amount or Par Value 25,287 [2],[3],[18]   25,287 [2],[3],[18]   23,814 [15],[16],[19]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     19,051                
Fair value, ending balance 20,230 [2],[3]   20,230 [2],[3]   19,051 [15],[16]            
Investment, Identifier [Axis]: New Benevis Topco, LLC, Common stock 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[22] 27,667   27,667                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Common stock 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] 12,966   12,966                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     28,481                
Fair value, ending balance [15],[24]         28,481            
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     13,347                
Fair value, ending balance [15],[16]         13,347            
Investment, Identifier [Axis]: New Permian Holdco, Inc., Ordinary shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     18,900                
Fair value, ending balance 14,000 [2],[3]   14,000 [2],[3]   18,900 [15],[16]            
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                      
Principal Amount or Par Value $ 23,336 [2],[3],[18],[25]   $ 23,336 [2],[3],[18],[25]   $ 23,336 [15],[16],[19],[26]            
Spread 9.00% [2],[3],[25]   9.00% [2],[3],[25]   9.00% [15],[16],[26] 9.00% [2],[3],[25] 9.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 23,336                
Fair value, ending balance $ 23,336 [2],[3],[25]   23,336 [2],[3],[25]   $ 23,336 [15],[16],[26]            
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                      
Principal Amount or Par Value $ 25,501 [1],[2],[3],[18],[25]   $ 25,501 [1],[2],[3],[18],[25]   $ 20,840 [15],[16],[19],[20],[26]            
Spread 6.00% [1],[2],[3],[25]   6.00% [1],[2],[3],[25]   6.00% [15],[16],[20],[26] 6.00% [1],[2],[3],[25] 6.00% [15],[16],[20],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26]     $ 20,840                
Fair value, ending balance $ 25,501 [1],[2],[3],[25]   25,501 [1],[2],[3],[25]   $ 20,840 [15],[16],[20],[26]            
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                      
Principal Amount or Par Value 6,394 [1],[2],[3],[18]   6,394 [1],[2],[3],[18]   1,055 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Next Holdco, LLC, First lien                      
Principal Amount or Par Value $ 6,296 [2],[18],[21],[22]   $ 6,296 [2],[18],[21],[22]   $ 3,494 [15],[19],[23],[24]            
Spread 5.25% [2],[21],[22]   5.25% [2],[21],[22]   5.75% [15],[23],[24] 5.25% [2],[21],[22] 5.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 3,494                
Fair value, ending balance $ 6,296 [2],[21],[22]   6,296 [2],[21],[22]   $ 3,494 [15],[23],[24]            
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value 903 [1],[2],[3],[18]   903 [1],[2],[3],[18]   903 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         339            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 339   339                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] 880   880                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 616   616                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         880            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (71)                
Fair value, ending balance [15],[16],[20]         (71)            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                      
Principal Amount or Par Value $ 10,160 [2],[3],[18],[25]   $ 10,160 [2],[3],[18],[25]   $ 10,058 [15],[16],[19],[26]            
Spread 4.75% [2],[3],[25],[35]   4.75% [2],[3],[25],[35]   4.75% [15],[16],[26],[31] 4.75% [2],[3],[25],[35] 4.75% [15],[16],[26],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 9,241                
Fair value, ending balance $ 7,115 [2],[3],[25]   7,115 [2],[3],[25]   $ 9,241 [15],[16],[26]            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                      
Principal Amount or Par Value $ 10,033 [2],[3],[18],[25]   $ 10,033 [2],[3],[18],[25]   $ 9,932 [15],[16],[19],[26]            
Spread 4.75% [2],[3],[25],[35]   4.75% [2],[3],[25],[35]   4.75% [15],[16],[26],[31] 4.75% [2],[3],[25],[35] 4.75% [15],[16],[26],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 9,126                
Fair value, ending balance $ 7,026 [2],[3],[25]   7,026 [2],[3],[25]   $ 9,126 [15],[16],[26]            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 3                      
Principal Amount or Par Value $ 885 [2],[3],[18],[25]   $ 885 [2],[3],[18],[25]   $ 877 [15],[16],[19],[26]            
Spread 4.75% [2],[3],[25],[35]   4.75% [2],[3],[25],[35]   4.75% [15],[16],[26],[31] 4.75% [2],[3],[25],[35] 4.75% [15],[16],[26],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 805                
Fair value, ending balance $ 620 [2],[3],[25]   620 [2],[3],[25]   $ 805 [15],[16],[26]            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien                      
Number of investments held | investment         3   3        
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20],[61]         $ 3,600            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[61]     0                
Fair value, ending balance [15],[16],[20],[61]         0            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 31,513            
Spread [15],[23],[24]         4.75%   4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     31,513                
Fair value, ending balance [15],[23],[24]         $ 31,513            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 27,425            
Spread [15],[23],[24]         4.75%   4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     27,425                
Fair value, ending balance [15],[23],[24]         $ 27,425            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 3                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 1,736            
Spread [15],[23],[24]         4.75%   4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     1,736                
Fair value, ending balance [15],[23],[24]         $ 1,736            
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[61]     7,646                
Fair value, ending balance [15],[16],[61]         7,646            
Investment, Identifier [Axis]: OEConnection LLC, First lien                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 46,430            
Spread [15],[23],[24]         5.00%   5.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     46,430                
Fair value, ending balance [15],[23],[24]         $ 46,430            
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 5,063   5,063                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         8,101            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         5,063            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: OEConnection LLC, First lien 1                      
Principal Amount or Par Value [2],[18],[21],[22] $ 46,197   $ 46,197                
Spread [2],[21],[22] 5.25%   5.25%     5.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[21],[22] $ 46,197   $ 46,197                
Investment, Identifier [Axis]: OEConnection LLC, First lien 2                      
Principal Amount or Par Value [2],[3],[18],[25] $ 8,061   $ 8,061                
Spread [2],[3],[25] 5.25%   5.25%     5.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 8,061   $ 8,061                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 1,860   1,860                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         1,860            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 1                      
Principal Amount or Par Value $ 14,880 [2],[3],[18],[25]   $ 14,880 [2],[3],[18],[25]   $ 7,440 [15],[19],[23],[24]            
Spread 7.75% [2],[3],[25]   7.75% [2],[3],[25]   7.75% [15],[23],[24] 7.75% [2],[3],[25] 7.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 7,440                
Fair value, ending balance $ 14,880 [2],[3],[25]   14,880 [2],[3],[25]   $ 7,440 [15],[23],[24]            
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 2                      
Principal Amount or Par Value $ 5,454 [2],[3],[18],[25]   $ 5,454 [2],[3],[18],[25]   $ 7,440 [15],[16],[19]            
Spread 7.25% [2],[3],[25]   7.25% [2],[3],[25]   7.75% [15],[16] 7.25% [2],[3],[25] 7.75% [15],[16]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     $ 7,440                
Fair value, ending balance $ 5,454 [2],[3],[25]   5,454 [2],[3],[25]   $ 7,440 [15],[16]            
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 3                      
Principal Amount or Par Value [15],[16],[19]         $ 5,454            
Spread [15],[16]         7.25%   7.25%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     5,454                
Fair value, ending balance [15],[16]         $ 5,454            
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien                      
Principal Amount or Par Value [15],[19],[28]         $ 18,161            
Spread [15],[28]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     18,161                
Fair value, ending balance [15],[28]         $ 18,161            
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Drawn                      
Principal Amount or Par Value [15],[19],[20],[28]         $ 2,360            
Spread [15],[20],[28]         5.50%   5.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[28]     2,360                
Fair value, ending balance [15],[20],[28]         $ 2,360            
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Drawn 1                      
Principal Amount or Par Value [1],[2],[18],[27] $ 1,865   $ 1,865                
Spread [1],[2],[27] 5.50%   5.50%     5.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[27] $ 1,865   $ 1,865                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Drawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] $ 732   $ 732                
Spread [1],[2],[3] 4.50%   4.50%     4.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 732   $ 732                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value 0 [1],[2],[18],[27]   0 [1],[2],[18],[27]   1,865 [15],[19],[20],[28]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[28]     0                
Fair value, ending balance 0 [1],[2],[27]   0 [1],[2],[27]   0 [15],[20],[28]            
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value 1,098 [1],[2],[3],[18]   1,098 [1],[2],[3],[18]   1,830 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien 1                      
Principal Amount or Par Value [2],[18],[27] $ 20,419   $ 20,419                
Spread [2],[27] 5.50%   5.50%     5.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[27] $ 20,419   $ 20,419                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien 2                      
Principal Amount or Par Value [2],[3],[18],[25] $ 513   $ 513                
Spread [2],[3],[25] 5.50%   5.50%     5.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 513   $ 513                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                      
Principal Amount or Par Value 486 [1],[2],[3],[18]   486 [1],[2],[3],[18]   486 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 1                      
Principal Amount or Par Value $ 22,275 [2],[18],[27]   $ 22,275 [2],[18],[27]   $ 22,388 [15],[19],[28]            
Spread 5.75% [2],[27]   5.75% [2],[27]   5.75% [15],[28] 5.75% [2],[27] 5.75% [15],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     $ 22,388                
Fair value, ending balance $ 22,275 [2],[27]   22,275 [2],[27]   $ 22,388 [15],[28]            
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 2                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 8,258            
Spread [15],[23],[24]         5.75%   5.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     8,258                
Fair value, ending balance [15],[23],[24]         $ 8,258            
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 2                      
Principal Amount or Par Value [2],[18],[21],[22] $ 8,217   $ 8,217                
Spread [2],[21],[22] 5.75%   5.75%     5.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[21],[22] $ 8,217   $ 8,217                
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                      
Principal Amount or Par Value 14,500 [2],[3],[18]   14,500 [2],[3],[18]   $ 14,500 [15],[16],[19]           $ 20,000
Spread [15],[16]         0.00%   0.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     6,525                
Fair value, ending balance 6,525 [2],[3]   6,525 [2],[3]   $ 6,525 [15],[16]            
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                      
Principal Amount or Par Value 0 [18],[34],[62]   0 [18],[34],[62]   $ 0 [19],[63],[64]            
Spread [63],[64]         0.00%   0.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [63],[64]     0                
Fair value, ending balance 0 [34],[62]   0 [34],[62]   $ 0 [63],[64]            
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien                      
Principal Amount or Par Value $ 7,615 [2],[18],[21],[22]   $ 7,615 [2],[18],[21],[22]   $ 7,654 [15],[19],[23],[24]            
Spread 5.25% [2],[21],[22]   5.25% [2],[21],[22]   5.25% [15],[23],[24] 5.25% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 7,635                
Fair value, ending balance $ 7,596 [2],[21],[22]   7,596 [2],[21],[22]   $ 7,635 [15],[23],[24]            
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18],[25] $ 264   $ 264                
Spread [1],[2],[3],[25] 5.25%   5.25%     5.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25] $ 264   $ 264                
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Drawn                      
Principal Amount or Par Value $ 623 [1],[2],[3],[18]   $ 623 [1],[2],[3],[18]   $ 258 [15],[16],[19],[20],[26]            
Spread 5.25% [1],[2],[3]   5.25% [1],[2],[3]   5.25% [15],[16],[20],[26] 5.25% [1],[2],[3] 5.25% [15],[16],[20],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26]     $ 258                
Fair value, ending balance $ 622 [1],[2],[3]   622 [1],[2],[3]   $ 258 [15],[16],[20],[26]            
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value 575 [1],[2],[3],[18]   575 [1],[2],[3],[18]   643 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (2)                
Fair value, ending balance (1) [1],[2],[3]   (1) [1],[2],[3]   (2) [15],[16],[20]            
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value 637 [1],[2],[3],[18]   637 [1],[2],[3],[18]   1,201 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (3)                
Fair value, ending balance (2) [1],[2],[3]   (2) [1],[2],[3]   (3) [15],[16],[20]            
Investment, Identifier [Axis]: Permian Trust, First lien                      
Principal Amount or Par Value 3,409 [2],[3],[18]   3,409 [2],[3],[18]   3,409 [15],[16],[19],[63]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[63]     0                
Fair value, ending balance 0 [2],[3]   0 [2],[3]   0 [15],[16],[63]            
Investment, Identifier [Axis]: Permian Trust, Trust Claim                      
Principal Amount or Par Value 247 [2],[18],[65]   247 [2],[18],[65]   247 [15],[19],[63],[66]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[63],[66]     0                
Fair value, ending balance 0 [2],[65]   0 [2],[65]   0 [15],[63],[66]            
Investment, Identifier [Axis]: PetVet Care Centers, LLC First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 3,708   3,708                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (91)   (91)                
Investment, Identifier [Axis]: PetVet Care Centers, LLC First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 3,708   3,708                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (91)   (91)                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 28,145            
Spread [15],[23],[24]         6.00%   6.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     28,145                
Fair value, ending balance [15],[23],[24]         $ 28,145            
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien                      
Principal Amount or Par Value [2],[3],[18],[25] $ 28,003   $ 28,003                
Spread [2],[3],[25] 6.00%   6.00%     6.00%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 27,317   $ 27,317                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[16],[19],[20]         3,708            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         3,708            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 0                
Fair value, ending balance [15],[16],[20]         $ 0            
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien                      
Number of investments held | investment 2   2   2 2 2        
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18],[67] $ 3,284   $ 3,284                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[67] 0   0                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20],[68]         $ 3,284            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[68]     0                
Fair value, ending balance [15],[16],[20],[68]         0            
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                      
Principal Amount or Par Value $ 23,089 [2],[3],[18],[25]   $ 23,089 [2],[3],[18],[25]   $ 23,089 [15],[16],[19],[26]            
Spread 6.00% [2],[3],[25]   6.00% [2],[3],[25]   6.50% [15],[16],[26] 6.00% [2],[3],[25] 6.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 23,089                
Fair value, ending balance $ 23,089 [2],[3],[25]   23,089 [2],[3],[25]   $ 23,089 [15],[16],[26]            
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                      
Principal Amount or Par Value $ 2,374 [2],[3],[18],[25]   $ 2,374 [2],[3],[18],[25]   $ 2,374 [15],[16],[19],[26]            
Spread 6.00% [2],[3],[25]   6.00% [2],[3],[25]   6.50% [15],[16],[26] 6.00% [2],[3],[25] 6.50% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 2,374                
Fair value, ending balance $ 2,374 [2],[3],[25]   2,374 [2],[3],[25]   $ 2,374 [15],[16],[26]            
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Class A-2 common units                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[67],[69] 2,160   2,160                
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Ordinary shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[68],[70]     2,000                
Fair value, ending balance [15],[68],[70]         2,000            
Investment, Identifier [Axis]: Planview Parent, Inc., Second lien                      
Principal Amount or Par Value $ 9,231 [2],[3],[18],[25]   $ 9,231 [2],[3],[18],[25]   $ 9,231 [19],[23],[24]            
Spread 5.75% [2],[3],[25]   5.75% [2],[3],[25]   5.75% [23],[24] 5.75% [2],[3],[25] 5.75% [23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [23],[24]     $ 9,208                
Fair value, ending balance $ 9,138 [2],[3],[25]   9,138 [2],[3],[25]   $ 9,208 [23],[24]            
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien                      
Principal Amount or Par Value $ 22,274 [2],[18],[27]   $ 22,274 [2],[18],[27]   $ 22,387 [15],[19],[28]            
Spread 4.75% [2],[27]   4.75% [2],[27]   4.75% [15],[28] 4.75% [2],[27] 4.75% [15],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     $ 22,387                
Fair value, ending balance $ 22,274 [2],[27]   22,274 [2],[27]   $ 22,387 [15],[28]            
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 4,032   4,032                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18] $ 257   $ 257                
Spread [1],[2],[3] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 257   $ 257                
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         4,289            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien                      
Principal Amount or Par Value $ 10,466 [2],[18],[40]   $ 10,466 [2],[18],[40]   $ 10,519 [15],[19],[39]            
Spread 5.25% [2],[40]   5.25% [2],[40]   5.25% [15],[39] 5.25% [2],[40] 5.25% [15],[39]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     $ 10,519                
Fair value, ending balance $ 10,467 [2],[40]   10,467 [2],[40]   $ 10,519 [15],[39]            
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien - Undrawn                      
Principal Amount or Par Value 1,510 [1],[2],[3],[18]   1,510 [1],[2],[3],[18]   1,510 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance 0 [1],[2],[3]   0 [1],[2],[3]   0 [15],[16],[20]            
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 [15],[16]     14,833                
Fair value, ending balance [15],[16]         14,833            
Investment, Identifier [Axis]: RLG Holdings, LLC, First lien                      
Principal Amount or Par Value $ 3,949 [18],[21],[22]   $ 3,949 [18],[21],[22]   $ 3,970 [19],[23],[24]            
Spread 5.00% [21],[22]   5.00% [21],[22]   5.00% [23],[24] 5.00% [21],[22] 5.00% [23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [23],[24]     $ 3,934                
Fair value, ending balance $ 3,438 [21],[22]   3,438 [21],[22]   $ 3,934 [23],[24]            
Investment, Identifier [Axis]: RailPros Parent, LLC, First lien                      
Principal Amount or Par Value [2],[18],[21],[22] $ 5,843   $ 5,843                
Spread [2],[21],[22] 4.50%   4.50%     4.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[21],[22] $ 5,813   $ 5,813                
Investment, Identifier [Axis]: RailPros Parent, LLC, First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 1,798   1,798                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: RailPros Parent, LLC, First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 899   899                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (4)   (4)                
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC , Warrants 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[22] 272   272                
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC , Warrants 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] 93   93                
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Trust Claim 1                      
Principal Amount or Par Value 152 [2],[18],[22]   152 [2],[18],[22]   $ 152 [15],[19],[24]            
Spread [15],[24]         0.00%   0.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     152                
Fair value, ending balance 152 [2],[22]   152 [2],[22]   $ 152 [15],[24]            
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Trust Claim 2                      
Principal Amount or Par Value 52 [2],[3],[18]   52 [2],[3],[18]   $ 52 [15],[16],[19]            
Spread [15],[16]         0.00%   0.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     52                
Fair value, ending balance 52 [2],[3]   52 [2],[3]   $ 52 [15],[16]            
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Warrants 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     327                
Fair value, ending balance [15],[24]         327            
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Warrants 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     112                
Fair value, ending balance [15],[16]         112            
Investment, Identifier [Axis]: Riskonnect Parent, LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         6,349            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Riskonnect Parent, LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 6,349   6,349                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         384            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                      
Principal Amount or Par Value $ 192 [1],[2],[3],[18]   $ 192 [1],[2],[3],[18]   $ 128 [15],[16],[19],[20]            
Spread 3.75% [1],[2],[3]   3.75% [1],[2],[3]   4.25% [15],[16],[20] 3.75% [1],[2],[3] 4.25% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 128                
Fair value, ending balance $ 192 [1],[2],[3]   192 [1],[2],[3]   $ 128 [15],[16],[20]            
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 320   320                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 1                      
Principal Amount or Par Value $ 7,408 [2],[18],[21],[22]   $ 7,408 [2],[18],[21],[22]   $ 7,446 [15],[19],[23],[24]            
Spread 4.75% [2],[21],[22]   4.75% [2],[21],[22]   5.25% [15],[23],[24] 4.75% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 7,446                
Fair value, ending balance $ 7,408 [2],[21],[22]   7,408 [2],[21],[22]   $ 7,446 [15],[23],[24]            
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 2                      
Principal Amount or Par Value $ 1,515 [2],[3],[18],[25]   $ 1,515 [2],[3],[18],[25]   $ 1,523 [15],[16],[19],[26]            
Spread 4.75% [2],[3],[25]   4.75% [2],[3],[25]   5.25% [15],[16],[26] 4.75% [2],[3],[25] 5.25% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 1,523                
Fair value, ending balance $ 1,515 [2],[3],[25]   1,515 [2],[3],[25]   $ 1,523 [15],[16],[26]            
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien                      
Principal Amount or Par Value $ 21,465 [2],[18],[21],[22]   $ 21,465 [2],[18],[21],[22]   $ 42,450 [15],[16],[19],[26]            
Spread 6.00% [2],[21],[22]   6.00% [2],[21],[22]   6.75% [15],[16],[26] 6.00% [2],[21],[22] 6.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 42,450                
Fair value, ending balance $ 21,304 [2],[21],[22]   21,304 [2],[21],[22]   $ 42,450 [15],[16],[26]            
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 2,717   2,717                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (20)   (20)                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     1,799                
Fair value, ending balance 1,799 [2],[22]   1,799 [2],[22]   1,799 [15],[24]            
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     201                
Fair value, ending balance 201 [2],[3]   201 [2],[3]   201 [15],[16]            
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18],[25] $ 291   $ 291                
Spread [1],[2],[3],[25] 3.75%   3.75%     3.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25] $ 282   $ 282                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn                      
Principal Amount or Par Value [15],[16],[19],[20],[26]         $ 324            
Spread [15],[16],[20],[26]         4.00%   4.00%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20],[26]     315                
Fair value, ending balance [15],[16],[20],[26]         $ 315            
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn                      
Principal Amount or Par Value 268 [1],[2],[3],[18]   268 [1],[2],[3],[18]   235 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (7)                
Fair value, ending balance (8) [1],[2],[3]   (8) [1],[2],[3]   (7) [15],[16],[20]            
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 1                      
Principal Amount or Par Value $ 10,194 [2],[18],[21],[22]   $ 10,194 [2],[18],[21],[22]   $ 10,247 [15],[19],[23],[24]            
Spread 5.50% [2],[21],[22]   5.50% [2],[21],[22]   5.75% [15],[23],[24] 5.50% [2],[21],[22] 5.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 9,953                
Fair value, ending balance $ 9,901 [2],[21],[22]   9,901 [2],[21],[22]   $ 9,953 [15],[23],[24]            
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 2                      
Principal Amount or Par Value $ 77 [2],[3],[18],[25]   $ 77 [2],[3],[18],[25]   $ 77 [15],[16],[19],[26]            
Spread 5.50% [2],[3],[25]   5.50% [2],[3],[25]   5.75% [15],[16],[26] 5.50% [2],[3],[25] 5.75% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 75                
Fair value, ending balance $ 74 [2],[3],[25]   74 [2],[3],[25]   $ 75 [15],[16],[26]            
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc.                      
Principal Amount or Par Value 23,842   23,842                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     16,450                
Fair value, ending balance [15],[28]         16,450            
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     5,671                
Fair value, ending balance [15],[16],[26]         5,671            
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Series A preferred shares 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[27] 17,313   17,313                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Series A preferred shares 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] 5,969   5,969                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                      
Principal Amount or Par Value $ 22,500 [2],[18],[27]   $ 22,500 [2],[18],[27]   $ 22,500 [15],[19],[28]            
Spread 8.00% [2],[27]   8.00% [2],[27]   8.00% [15],[28] 8.00% [2],[27] 8.00% [15],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     $ 22,500                
Fair value, ending balance $ 22,500 [2],[27]   22,500 [2],[27]   $ 22,500 [15],[28]            
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                      
Principal Amount or Par Value $ 5,697 [2],[18],[21],[22]   $ 5,697 [2],[18],[21],[22]   $ 5,697 [15],[19],[23],[24]            
Spread 8.00% [2],[21],[22]   8.00% [2],[21],[22]   8.00% [15],[23],[24] 8.00% [2],[21],[22] 8.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 5,697                
Fair value, ending balance $ 5,697 [2],[21],[22]   5,697 [2],[21],[22]   $ 5,697 [15],[23],[24]            
Investment, Identifier [Axis]: TMK Hawk Parent, Corp. First Lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 2,695   2,695                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         2,695            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                      
Principal Amount or Par Value $ 12,554 [2],[18],[22]   $ 12,554 [2],[18],[22]   12,327 [15],[19],[24]            
Spread [2],[22],[35] 3.25%   3.25%     3.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     $ 10,402                
Fair value, ending balance $ 10,593 [2],[22]   10,593 [2],[22]   10,402 [15],[24]            
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                      
Principal Amount or Par Value $ 10,107 [2],[3],[18],[25]   $ 10,107 [2],[3],[18],[25]   9,925 [15],[16],[19]            
Spread [2],[3],[25],[35] 3.25%   3.25%     3.25%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     $ 8,374                
Fair value, ending balance $ 8,528 [2],[3],[25]   8,528 [2],[3],[25]   8,374 [15],[16]            
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 3                      
Principal Amount or Par Value $ 2,879 [2],[3],[18],[25]   $ 2,879 [2],[3],[18],[25]   $ 2,843 [15],[16],[19]            
Spread 3.00% [2],[3],[25],[35]   3.00% [2],[3],[25],[35]   2.00% [15],[16],[31] 3.00% [2],[3],[25],[35] 2.00% [15],[16],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     $ 2,351                
Fair value, ending balance $ 2,381 [2],[3],[25]   2,381 [2],[3],[25]   $ 2,351 [15],[16]            
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 1                      
Principal Amount or Par Value 319 [2],[18],[22]   319 [2],[18],[22]   302 [15],[19],[24]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     302                
Fair value, ending balance 319 [2],[22]   319 [2],[22]   302 [15],[24]            
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 2                      
Principal Amount or Par Value 308 [2],[3],[18]   308 [2],[3],[18]   291 [15],[16],[19]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     291                
Fair value, ending balance 308 [2],[3]   308 [2],[3]   291 [15],[16]            
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Class B-1 Common Shares                      
Principal Amount or Par Value 48,080   48,080                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] 31,036   31,036                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Class B-2 Common Shares                      
Principal Amount or Par Value 29,707   29,707                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] 19,176   19,176                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     59,978                
Fair value, ending balance [15],[16]         59,978            
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Preferred shares                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     9,352                
Fair value, ending balance [15],[16]         9,352            
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Series C-2 Preferred Units                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] 8,100   8,100                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien                      
Principal Amount or Par Value [15],[16],[19],[26],[33]         $ 19,418            
Spread [15],[16],[26],[31],[33]         3.50%   3.50%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26],[33]     19,321                
Fair value, ending balance [15],[16],[26],[33]         $ 19,321            
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                      
Principal Amount or Par Value [2],[3],[18],[25] $ 19,617   $ 19,617                
Spread [2],[3],[25],[35] 3.50%   3.50%     3.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 19,519   $ 19,519                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                      
Principal Amount or Par Value [2],[18],[22] $ 16,084   $ 16,084                
Spread [2],[22],[35] 3.50%   3.50%     3.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[22] $ 16,003   $ 16,003                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                      
Principal Amount or Par Value [18],[22] $ 881   $ 881                
Spread [22],[35] 3.50%   3.50%     3.50%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [22] $ 881   $ 881                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                      
Principal Amount or Par Value [15],[19],[23],[24]         $ 29,868            
Spread [15],[23],[24],[31]         3.38%   3.38%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     29,868                
Fair value, ending balance [15],[23],[24]         $ 29,868            
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                      
Principal Amount or Par Value [2],[3],[18],[25] $ 29,868   $ 29,868                
Spread [2],[3],[25],[35] 3.38%   3.38%     3.38%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 29,868   $ 29,868                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[18],[22] 751   751                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[22] 0   0                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 4,267   4,267                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                      
Principal Amount or Par Value $ 2,968 [1],[2],[18],[22]   $ 2,968 [1],[2],[18],[22]   $ 2,440 [15],[19],[20],[24]            
Spread 3.38% [1],[2],[22],[35]   3.38% [1],[2],[22],[35]   3.38% [15],[20],[24],[31] 3.38% [1],[2],[22],[35] 3.38% [15],[20],[24],[31]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[24]     $ 2,440                
Fair value, ending balance $ 2,990 [1],[2],[22]   2,990 [1],[2],[22]   $ 2,440 [15],[20],[24]            
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [15],[19],[20],[24]         1,301            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[24]     0                
Fair value, ending balance [15],[20],[24]         0            
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         4,267            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 1,501   1,501                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                      
Principal Amount or Par Value [15],[19],[20],[23],[24]         785            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[20],[23],[24]     0                
Fair value, ending balance [15],[20],[23],[24]         0            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                      
Principal Amount or Par Value [15],[16],[19],[20]         1,501            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien 1                      
Principal Amount or Par Value $ 15,382 [2],[18],[21],[22]   $ 15,382 [2],[18],[21],[22]   $ 15,382 [15],[19],[23],[24]            
Spread 4.25% [2],[21],[22]   4.25% [2],[21],[22]   5.25% [15],[23],[24] 4.25% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 15,382                
Fair value, ending balance $ 15,382 [2],[21],[22]   15,382 [2],[21],[22]   $ 15,382 [15],[23],[24]            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien 2                      
Principal Amount or Par Value $ 5,157 [2],[18],[21],[22]   $ 5,157 [2],[18],[21],[22]   $ 4,467 [15],[19],[23],[24]            
Spread 4.25% [2],[21],[22]   4.25% [2],[21],[22]   5.25% [15],[23],[24] 4.25% [2],[21],[22] 5.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 4,467                
Fair value, ending balance $ 5,157 [2],[21],[22]   5,157 [2],[21],[22]   $ 4,467 [15],[23],[24]            
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 893   893                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         893            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                      
Principal Amount or Par Value $ 6,948 [2],[3],[18],[25]   $ 6,948 [2],[3],[18],[25]   $ 6,984 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   5.00% [15],[16],[26] 5.00% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 6,984                
Fair value, ending balance $ 6,948 [2],[3],[25]   6,948 [2],[3],[25]   $ 6,984 [15],[16],[26]            
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                      
Principal Amount or Par Value $ 5,513 [2],[18],[21],[22]   $ 5,513 [2],[18],[21],[22]   $ 5,541 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 5,541                
Fair value, ending balance $ 5,513 [2],[21],[22]   5,513 [2],[21],[22]   $ 5,541 [15],[23],[24]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     0                
Fair value, ending balance 0 [2],[22]   0 [2],[22]   0 [15],[24]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     0                
Fair value, ending balance 0 [2],[3]   0 [2],[3]   0 [15],[16]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     20,646                
Fair value, ending balance 58,490 [2],[3]   58,490 [2],[3]   20,646 [15],[16]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 2                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     12,682                
Fair value, ending balance 11,031 [2],[3]   11,031 [2],[3]   12,682 [15],[16]            
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 [15],[16]     3,080                
Fair value, ending balance 0 [2],[22]   0 [2],[22]   3,080 [15],[16]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[24]     0                
Fair value, ending balance 0 [2],[3]   0 [2],[3]   0 [15],[24]            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 5                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     0                
Fair value, ending balance [15],[16]         0            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                      
Principal Amount or Par Value [15],[16],[19]         15,608            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     15,459                
Fair value, ending balance [15],[16]         15,459            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                      
Principal Amount or Par Value [15],[16],[19]         6,919            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     6,853                
Fair value, ending balance [15],[16]         6,853            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Warrants                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     48,804                
Fair value, ending balance [15],[16]         48,804            
Investment, Identifier [Axis]: Vehlo Purchaser, LLC First lien - Undrawn                      
Principal Amount or Par Value [1],[3],[18] 9,970   9,970                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[3] (50)   (50)                
Investment, Identifier [Axis]: Viper Bidco,Inc., First lien                      
Principal Amount or Par Value 16,443   16,443                
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien                      
Principal Amount or Par Value $ 11,970 [2],[3],[18],[25],[59]   $ 11,970 [2],[3],[18],[25],[59]   $ 12,030 [15],[16],[19],[26],[60]            
Spread 5.00% [2],[3],[25],[59]   5.00% [2],[3],[25],[59]   5.00% [15],[16],[26],[60] 5.00% [2],[3],[25],[59] 5.00% [15],[16],[26],[60]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26],[60]     $ 14,981                
Fair value, ending balance $ 16,361 [2],[3],[25],[59]   16,361 [2],[3],[25],[59]   $ 14,981 [15],[16],[26],[60]            
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien - Undrawn 1                      
Principal Amount or Par Value 3,320 [1],[2],[3],[18]   3,320 [1],[2],[3],[18]   4,150 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance (17) [1],[2],[3]   (17) [1],[2],[3]   0 [15],[16],[20]            
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien - Undrawn 2                      
Principal Amount or Par Value 4,150 [1],[2],[3],[18]   4,150 [1],[2],[3],[18]   3,320 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (17)                
Fair value, ending balance (21) [1],[2],[3]   (21) [1],[2],[3]   (17) [15],[16],[20]            
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien 1                      
Principal Amount or Par Value         15,057            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 2,040   2,040                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         2,040            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     0                
Fair value, ending balance [15],[16],[20]         0            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                      
Principal Amount or Par Value $ 15,514 [2],[18],[21],[22]   $ 15,514 [2],[18],[21],[22]   $ 15,593 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 15,593                
Fair value, ending balance $ 15,514 [2],[21],[22]   15,514 [2],[21],[22]   $ 15,593 [15],[23],[24]            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                      
Principal Amount or Par Value $ 11,847 [2],[3],[18],[25]   $ 11,847 [2],[3],[18],[25]   $ 11,908 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   5.00% [15],[16],[26] 5.00% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 11,908                
Fair value, ending balance $ 11,847 [2],[3],[25]   11,847 [2],[3],[25]   $ 11,908 [15],[16],[26]            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                      
Principal Amount or Par Value $ 6,625 [2],[18],[21],[22]   $ 6,625 [2],[18],[21],[22]   $ 6,659 [15],[19],[23],[24]            
Spread 5.00% [2],[21],[22]   5.00% [2],[21],[22]   5.00% [15],[23],[24] 5.00% [2],[21],[22] 5.00% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 6,659                
Fair value, ending balance $ 6,625 [2],[21],[22]   6,625 [2],[21],[22]   $ 6,659 [15],[23],[24]            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 4                      
Principal Amount or Par Value $ 1,222 [2],[3],[18],[25]   $ 1,222 [2],[3],[18],[25]   $ 1,228 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   5.00% [15],[16],[26] 5.00% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 1,228                
Fair value, ending balance $ 1,222 [2],[3],[25]   1,222 [2],[3],[25]   $ 1,228 [15],[16],[26]            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 5                      
Principal Amount or Par Value $ 819 [2],[3],[18],[25]   $ 819 [2],[3],[18],[25]   $ 824 [15],[16],[19],[26]            
Spread 5.00% [2],[3],[25]   5.00% [2],[3],[25]   5.00% [15],[16],[26] 5.00% [2],[3],[25] 5.00% [15],[16],[26]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[26]     $ 824                
Fair value, ending balance $ 819 [2],[3],[25]   819 [2],[3],[25]   $ 824 [15],[16],[26]            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subordinated                      
Principal Amount or Par Value [15],[16],[19]         4,231            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16]     4,231                
Fair value, ending balance [15],[16]         4,231            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subordinated                      
Principal Amount or Par Value [2],[3],[18] 4,372   4,372                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3] 4,372   4,372                
Investment, Identifier [Axis]: Xactly Corporation, First lien                      
Principal Amount or Par Value $ 22,500 [2],[18],[27]   $ 22,500 [2],[18],[27]   $ 22,500 [15],[19],[28]            
Spread 6.25% [2],[27]   6.25% [2],[27]   6.25% [15],[28] 6.25% [2],[27] 6.25% [15],[28]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[28]     $ 22,250                
Fair value, ending balance $ 22,294 [2],[27]   22,294 [2],[27]   $ 22,250 [15],[28]            
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                      
Principal Amount or Par Value 992 [1],[2],[3],[18]   992 [1],[2],[3],[18]   992 [15],[16],[19],[20]            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (11)                
Fair value, ending balance (9) [1],[2],[3]   (9) [1],[2],[3]   (11) [15],[16],[20]            
Investment, Identifier [Axis]: YLG Holding, Inc, First lien 2                      
Principal Amount or Par Value [2],[18],[21],[22] $ 4,330   $ 4,330                
Spread [2],[21],[22] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[21],[22] $ 4,330   $ 4,330                
Investment, Identifier [Axis]: YLG Holding, Inc, First lien - Drawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] $ 35   $ 35                
Spread [1],[2],[3] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 35   $ 35                
Investment, Identifier [Axis]: YLG Holding, Inc, First lien - Drawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] $ 327   $ 327                
Spread [1],[2],[3] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] $ 327   $ 327                
Investment, Identifier [Axis]: YLG Holding, Inc, First lien 1                      
Principal Amount or Par Value [2],[18],[40] $ 21,770   $ 21,770                
Spread [2],[40] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[40] $ 21,770   $ 21,770                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien                      
Principal Amount or Par Value [15],[19],[39]         $ 21,825            
Spread [15],[39]         4.75%   4.75%        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[39]     21,825                
Fair value, ending balance [15],[39]         $ 21,825            
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 274   274                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 340   340                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] 0   0                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien - Drawn                      
Principal Amount or Par Value [1],[2],[3],[18],[25] $ 301   $ 301                
Spread [1],[2],[3],[25] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3],[25] $ 298   $ 298                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien - Undrawn 1                      
Principal Amount or Par Value [1],[2],[3],[18] 1,074   1,074                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (11)   (11)                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien - Undrawn 2                      
Principal Amount or Par Value [1],[2],[3],[18] 1,847   1,847                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (18)   (18)                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien 1                      
Principal Amount or Par Value [2],[3],[18],[25] $ 11,380   $ 11,380                
Spread [2],[3],[25] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 11,266   $ 11,266                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien 2                      
Principal Amount or Par Value [2],[3],[18],[25] $ 1,889   $ 1,889                
Spread [2],[3],[25] 4.75%   4.75%     4.75%          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [2],[3],[25] $ 1,871   $ 1,871                
Investment, Identifier [Axis]: iCIMS, Inc. First lien - Undrawn                      
Principal Amount or Par Value [1],[2],[3],[18] 3,000   3,000                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, ending balance [1],[2],[3] (74)   (74)                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Drawn                      
Principal Amount or Par Value $ 529 [1],[2],[3],[18]   $ 529 [1],[2],[3],[18]   $ 706 [15],[16],[19],[20]            
Spread 5.75% [1],[2],[3]   5.75% [1],[2],[3]   5.75% [15],[16],[20] 5.75% [1],[2],[3] 5.75% [15],[16],[20]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     $ 701                
Fair value, ending balance $ 516 [1],[2],[3]   516 [1],[2],[3]   $ 701 [15],[16],[20]            
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn                      
Principal Amount or Par Value [15],[16],[19],[20]         2,824            
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[16],[20]     (21)                
Fair value, ending balance [15],[16],[20]         (21)            
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                      
Principal Amount or Par Value $ 44,742 [2],[18],[21],[22]   $ 44,742 [2],[18],[21],[22]   $ 44,742 [15],[19],[23],[24]            
Spread 5.75% [2],[21],[22]   5.75% [2],[21],[22]   5.75% [15],[23],[24] 5.75% [2],[21],[22] 5.75% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 44,406                
Fair value, ending balance $ 43,637 [2],[21],[22]   43,637 [2],[21],[22]   $ 44,406 [15],[23],[24]            
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                      
Principal Amount or Par Value $ 7,366 [2],[18],[21],[22]   $ 7,366 [2],[18],[21],[22]   $ 7,366 [15],[19],[23],[24]            
Spread 6.25% [2],[21],[22]   6.25% [2],[21],[22]   6.25% [15],[23],[24] 6.25% [2],[21],[22] 6.25% [15],[23],[24]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                      
Fair value, beginning balance [15],[23],[24]     $ 7,311                
Fair value, ending balance $ 7,184 [2],[21],[22]   $ 7,184 [2],[21],[22]   $ 7,311 [15],[23],[24]            
[1] 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.
[2] 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.
[3] Investment is held by New Mountain Finance Corporation
[4] 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.
[5] 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.
[6] 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.
[7] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[8] 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.
[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 additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[11] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[12] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[13] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[14] 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 held by New Mountain Finance Corporation
[17] 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.
[18] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[19] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[20] 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.
[21] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent, and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian.. See Note 7. Borrowings, for details.
[22] Investment is held by New Mountain Finance Holdings, L.L.C.
[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. 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 held by New Mountain Finance Holdings, L.L.C.
[25] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower, Sumitomo Mitsui Banking Corporation, as administrative agent, sole lead arranger, and sole book runner, and the lenders party thereto. See Note 7. Borrowings, for details
[26] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower, Sumitomo Mitsui Banking Corporation, as administrative agent, sole lead arranger, and sole book runner, and the lenders party thereto. See Note 7. Borrowings, for details
[27] Investment is held by New Mountain Finance SBIC, L.P.
[28] Investment is held by New Mountain Finance SBIC, L.P.
[29] 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 Company's preferred equity investment is entitled to receive cumulative preferred dividends that is calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of June 30, 2025, the Company's stated value of it's equity investment plus unpaid compounded dividends was $19,666.
[30] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, two first lien delayed draws and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc.
[31] All or a portion of interest contains PIK interest.
[32] 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, 2025, 15.5% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[33] 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, 2024, 14.6% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[34] Investment is on non-accrual status as of June 30, 2025. See Note 3. Investments, for details.
[35] All or a portion of interest contains PIK interest. See Note 2. Summary of Significant Accounting Policies-Revenue Recognition, for details.
[36] Investment is held by NMF Ancora Holdings, Inc.
[37] Investment is held by NMF Ancora Holdings, Inc.
[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's preferred equity investment in Dealer Tire Holdings, LLC is entitled to receive cumulative preferred dividends that is calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of June 30, 2025, the Company's stated value of it's share plus unpaid compounded dividends was $84,739.
[42] The Company holds investments in two wholly-owned subsidiaries of Diamond Parent Holdings Corp. The Company holds two first lien term loans, a first lien delayed draw and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc.
[43] The Company holds investments in two wholly-owned subsidiaries of Diamond Parent Holdings Corp. The Company holds two first lien term loans, a first lien delayed draw and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that is calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of June 30, 2025, the Company's stated value of it's equity investment plus unpaid compounded dividends was $15,037.
[44] The Company holds preferred equity in Eclipse Topco, Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Eclipse Buyer, Inc., a wholly-owned subsidiary of Eclipse Topco, Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that is calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of June 30, 2025, the Company's stated value of it's equity investment plus unpaid compounded dividends was $2,094.
[45] The Company holds preferred equity in Eclipse Topco, Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Eclipse Buyer, Inc., a wholly-owned subsidiary of Eclipse Topco, Inc.
[46] The Company holds ordinary shares and Class B-1 and Class B-2 of preferred equity in TVG-Edmentum Holdings, LLC, and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC. As of June 30, 2025, the Company's stated value of the Company's Class B-1 and Class B-2 preferred equity investment plus unpaid compounded dividends was $48,080 and $29,707, respectively.
[47] 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.
[48] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and five first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[49] The Company holds a LP Interest in Firebird Co-Invest L.P. and holds a first lien term loan, a first lien delayed and a first lien revolver in Firebird Acquisition Corp, Inc., a wholly-owned subsidiary of Firebird Co-Invest L.P. .
[50] The Company's common equity investment in HBWM Holdings, LLC. is entitled to receive cumulative return that is calculated using the unreturned original investment plus any unpaid capitalized dividends. As of June 30, 2025, the Company's unreturned original investment plus any unpaid capitalized dividends was $4,750.
[51] Investment is held by NMF HB, Inc.
[52] Investment is held by NMF HB, Inc.
[53] The Company holds preferred equity in Knockout Intermediate Holdings I Inc. and a first lien term loan, a first lien revolver and two first lien delayed draws in Kaseya, Inc., a wholly-owned subsidiary of Knockout Intermediate Holdings I Inc.
[54] The Company's preferred equity investment in Knockout Intermediate Holdings I, Inc. is entitled to receive cumulative preferred dividends that is calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of June 30, 2025, the Company's stated value of it's share plus unpaid compounded dividends was $14,237.
[55] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a second lien Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp. The second lien Tranche A Term Loan is entitled to receive 20% of the interest earned on the first lien Tranche A Term Loan, which accrues interest at a rate of SOFR + 5.00%, and 20% of the interest earned on the first lien Tranche B Term Loan, which accrues interest at a rate of SOFR + 6.00%.
[56] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a second lien Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp. The second lien Tranche A Term Loan is entitled to receive 20% of the interest earned on the first lien Tranche A Term Loan, which accrues interest at a rate of SOFR + 5.00%, and 20% of the interest earned on the first lien Tranche B Term Loan, which accrues interest at a rate of SOFR + 6.00%.
[57] Investment is held by New Mountain Net Lease Corporation.
[58] Investment is held by New Mountain Net Lease Corporation.
[59] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of June 30, 2025, the par value U.S. dollar equivalent of the Viper Bidco, Inc. first lien term loans is $16,443, the Nelipak Holding Company first lien term loan, undrawn delayed draw term loan, undrawn revolver and drawn revolver is $19,383, $7,558, $1,318 and $92, respectively. See Note 2. Summary of Significant Accounting Policies, for details
[60] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2024, the par value U.S. dollar equivalent of the Viper Bidco, Inc. first lien term loans is $15,057 and the Nelipak Holding Company first lien term loan, drawn revolver, undrawn delayed draw term loan and undrawn revolver is $17,109, $406 $6,638 and $833, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[61] The Company holds ordinary shares in OA Topco, L.P., and three first lien term loans and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[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, 2025. See Note 2. Summary of Significant Accounting Policies, for details.
[63] Investment is on non-accrual status. See Note 3. Investments, for details.
[64] 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 December 31, 2024. See Note 2. Summary of Significant Accounting Policies, for details.
[65] Investment is held by NMF Permian Holdings, LLC.
[66] Investment is held by NMF Permian Holdings, LLC.
[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] 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.
[69] Investment is held by NMF Pioneer, Inc.
[70] Investment is held by NMF Pioneer, Inc.