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Consolidated Schedule of Investments (Parenthetical)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
investment
numberOfAgreement
Mar. 31, 2024
EUR (€)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
investment
numberOfAgreement
Mar. 31, 2024
EUR (€)
investment
numberOfAgreement
Mar. 31, 2024
GBP (£)
investment
numberOfAgreement
Dec. 31, 2023
EUR (€)
investment
numberOfAgreement
Dec. 31, 2023
GBP (£)
investment
numberOfAgreement
Sep. 30, 2023
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Number of collateralized agreements | numberOfAgreement 1     1 1 1 1 1        
Cost basis of securities purchased under collateralized agreements to resell $ 30,000     $ 30,000                
Fair value of securities purchased under collateralized agreements to resell 16,500     16,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [1] 3,011,322                      
Net Change In Unrealized Appreciation (Depreciation) 2,994   $ 5,878                  
Fair Value, ending balance 3,069,982 [2]     $ 3,011,322 [1]                
Net Realized Gains (Losses) $ (11,827)   677                  
Investments at fair value that are non-qualifying assets as a percentage of total assets 14.80%     14.80% 14.80% 14.80% 14.80% 14.80%        
QID NGL, LLC | Common Class B                        
Ownership percentage 4.60% 4.60%   4.60%                
QID TRH Holdings, LLC | Common Class B                        
Ownership percentage 97.00% 97.00%   97.00%                
NMFC Senior Loan Program III LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Dividend Income $ 5,863   4,462                  
NMFC Senior Loan Program IV LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Dividend Income 4,356   3,583                  
Non-controlled/Affiliated                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 133,659   130,787 $ 130,787                
Gross Additions 2,085 [3]     22,390 [4]                
Gross Redemptions 0 [5]     (466) [6]                
Net Change In Unrealized Appreciation (Depreciation) (22,463)     (19,052)                
Fair Value, ending balance 113,281     133,659                
Net Realized Gains (Losses) 0     0                
Interest Income 1,204     4,134                
Dividend Income 1,244     4,625                
Other Income 63   63 251                
Non-controlled/Affiliated | Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 17,873   0 0                
Gross Additions 0 [3]     15,581 [4]                
Gross Redemptions 0 [5]     (459) [6]                
Net Change In Unrealized Appreciation (Depreciation) 1,523     2,751                
Fair Value, ending balance 19,396     17,873                
Net Realized Gains (Losses) 0     0                
Interest Income 363     1,084                
Dividend Income 0     0                
Other Income 0     0                
Non-controlled/Affiliated | Sierra Hamilton Holdings Corporation                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 2,000   4,000 4,000                
Gross Additions 0 [3]     2 [4]                
Gross Redemptions 0 [5]     (7) [6]                
Net Change In Unrealized Appreciation (Depreciation) 0     (1,995)                
Fair Value, ending balance 2,000     2,000                
Net Realized Gains (Losses) 0     0                
Interest Income 0     2                
Dividend Income 0     0                
Other Income 0     1                
Non-controlled/Affiliated | TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 113,786   126,787 126,787                
Gross Additions 2,085 [3]     6,807 [4]                
Gross Redemptions 0 [5]     0 [6]                
Net Change In Unrealized Appreciation (Depreciation) (23,986)     (19,808)                
Fair Value, ending balance 91,885     113,786                
Net Realized Gains (Losses) 0     0                
Interest Income 841     3,048                
Dividend Income 1,244     4,625                
Other Income 63     250                
Controlled                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 667,796   690,035 690,035                
Gross Additions 6,987 [7]     40,458 [8]                
Gross Redemptions 0 [9]     (44,109) [10]                
Net Change In Unrealized Appreciation (Depreciation) 2,320     (18,588)                
Fair Value, ending balance 677,103     667,796                
Net Realized Gains (Losses) 31     16,413                
Interest Income 5,496     20,829                
Dividend Income 14,179     51,208                
Other Income 873   1,195 5,315                
Controlled | Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 3,419   35,788 35,788                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) (1)     (32,369)                
Fair Value, ending balance 3,418     3,419                
Net Realized Gains (Losses) 0     33,815                
Interest Income 0     0                
Dividend Income 0     0                
Other Income 10     2,041                
Controlled | National HME, Inc./NHME Holdings Corp.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 3,000   5,381 5,381                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     (17,404) [10]                
Net Change In Unrealized Appreciation (Depreciation) 0     15,023                
Fair Value, ending balance 3,000     3,000                
Net Realized Gains (Losses) 0     (17,404)                
Interest Income 0     0                
Dividend Income 0     0                
Other Income 0     0                
Controlled | New Benevis Topco, LLC / New Benevis Holdco, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 135,401   114,146 114,146                
Gross Additions 2,685 [7]     26,153 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) (5,523)     (4,898)                
Fair Value, ending balance 132,563     135,401                
Net Realized Gains (Losses) 0     0                
Interest Income 3,488     11,632                
Dividend Income 0     0                
Other Income 375     1,500                
Controlled | New Permian Holdco, Inc. / New Permian Holdco, L.L.C.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 63,170   57,564 57,564                
Gross Additions 2,071 [7]     5,606 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) 0     0                
Fair Value, ending balance 65,241     63,170                
Net Realized Gains (Losses) 0     0                
Interest Income 1,272     5,197                
Dividend Income 0     0                
Other Income 125     506                
Controlled | NM APP CANADA CORP                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 7   0 0                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) (7)     7                
Fair Value, ending balance 0     7                
Net Realized Gains (Losses) 31     0                
Interest Income 0     0                
Dividend Income 0     0                
Other Income 0     0                
Controlled | NM CLFX LP                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 11,731   16,172 16,172                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     (259) [10]                
Net Change In Unrealized Appreciation (Depreciation) (466)     (4,182)                
Fair Value, ending balance 11,265     11,731                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 195     1,252                
Other Income 0     0                
Controlled | NM NL Holdings, L.P.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 96,071   94,305 94,305                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) 4,761     1,766                
Fair Value, ending balance 100,832     96,071                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 2,030     8,191                
Other Income 0     0                
Controlled | NM GP Holdco, LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 1,048   1,028 1,028                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) 52     20                
Fair Value, ending balance 1,100     1,048                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 21     88                
Other Income 0     0                
Controlled | NM YI LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 9,550   9,481 9,481                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) 100     69                
Fair Value, ending balance 9,650     9,550                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 219     853                
Other Income 0     0                
Controlled | NMFC Senior Loan Program III LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 140,000   140,000 140,000                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) 0     0                
Fair Value, ending balance 140,000     140,000                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 5,862     20,038                
Other Income 0     0                
Controlled | NMFC Senior Loan Program IV LLC                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 112,400   112,400 112,400                
Gross Additions 0 [7]     0 [8]                
Gross Redemptions 0 [9]     0 [10]                
Net Change In Unrealized Appreciation (Depreciation) 0     0                
Fair Value, ending balance 112,400     112,400                
Net Realized Gains (Losses) 0     0                
Interest Income 0     0                
Dividend Income 4,356     15,483                
Other Income 0     0                
Controlled | UniTek Global Services, Inc.                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 91,999   $ 103,770 103,770                
Gross Additions 2,231 [7]     8,699 [8]                
Gross Redemptions 0 [9]     (26,446) [10]                
Net Change In Unrealized Appreciation (Depreciation) 3,404     5,976                
Fair Value, ending balance 97,634     91,999                
Net Realized Gains (Losses) 0     2                
Interest Income 736     4,000                
Dividend Income 1,496     5,303                
Other Income 363     1,268                
Investment, Identifier [Axis]: AAC Lender Holdings, LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [11],[12],[13] 0                      
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 [14],[15],[16]       0                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 1                        
Principal Amount or Par Value [15],[17],[18],[19]       22,965                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] 22,965                      
Fair Value, ending balance [15],[18],[19]       $ 22,965                
Spread [15],[18],[19]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Drawn 2                        
Principal Amount or Par Value [15],[17],[18],[20]       $ 7,450                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[20] 7,450                      
Fair Value, ending balance [15],[18],[20]       $ 7,450                
Spread [15],[18],[20]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                        
Principal Amount or Par Value 3,659 [12],[13],[21]     $ 3,659 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                        
Principal Amount or Par Value 22,907 [12],[22],[23]     20,426 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 20,426                      
Fair Value, ending balance $ 22,907 [12],[23]     $ 20,426 [15],[24]                
Spread 5.50% [12],[23]     5.50% [15],[24] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[24] 5.50% [15],[24]        
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                        
Principal Amount or Par Value $ 20,374 [12],[22],[25]     $ 9,698 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 9,698                      
Fair Value, ending balance $ 20,374 [12],[25]     $ 9,698 [15],[20]                
Spread 5.50% [12],[25]     5.50% [15],[20] 5.50% [12],[25] 5.50% [12],[25] 5.50% [15],[20] 5.50% [15],[20]        
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 3                        
Principal Amount or Par Value [12],[22],[26] $ 9,673                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[26] $ 9,673                      
Spread [12],[26] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 4                        
Principal Amount or Par Value [12],[22],[26] $ 7,432                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[26] $ 7,432                      
Spread [12],[26] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                        
Principal Amount or Par Value $ 14,419 [12],[13],[22]     $ 14,011 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 13,420                      
Fair Value, ending balance 13,695 [12],[13]     13,420 [15],[16]                
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                        
Principal Amount or Par Value 5,655 [12],[22],[26]     5,495 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 5,263                      
Fair Value, ending balance 5,371 [12],[26]     5,263 [15],[20]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 1                        
Principal Amount or Par Value 2,039 [12],[13],[21],[22]     1,397 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 1,364                      
Fair Value, ending balance $ 1,985 [12],[13],[21]     $ 1,364 [15],[16],[18]                
Spread 5.50% [12],[13],[21]     5.50% [15],[16],[18] 5.50% [12],[13],[21] 5.50% [12],[13],[21] 5.50% [15],[16],[18] 5.50% [15],[16],[18]        
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn 2                        
Principal Amount or Par Value $ 353 [12],[13],[21],[22]     $ 353 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 345                      
Fair Value, ending balance $ 344 [12],[13],[21]     $ 345 [15],[16],[18]                
Spread 5.50% [12],[13],[21]     5.50% [15],[16],[18] 5.50% [12],[13],[21] 5.50% [12],[13],[21] 5.50% [15],[16],[18] 5.50% [15],[16],[18]        
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                        
Principal Amount or Par Value $ 2,001 [12],[13],[21],[22]     $ 2,001 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (48)                      
Fair Value, ending balance (53) [12],[13],[21]     (48) [15],[16],[18]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value 2,262 [12],[13],[21],[22]     2,909 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (70)                      
Fair Value, ending balance (60) [12],[13],[21]     (70) [15],[16],[18]                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 1                        
Principal Amount or Par Value 21,969 [12],[22],[23]     22,025 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 21,498                      
Fair Value, ending balance $ 21,384 [12],[23]     $ 21,498 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 2                        
Principal Amount or Par Value $ 3,894 [12],[13],[22]     $ 3,904 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 3,810                      
Fair Value, ending balance $ 3,790 [12],[13]     $ 3,810 [15],[16]                
Spread 5.50% [12],[13]     5.50% [15],[16] 5.50% [12],[13] 5.50% [12],[13] 5.50% [15],[16] 5.50% [15],[16]        
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares                        
Preferred equity dividend rate       11.75%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[27] $ 15,040                      
Fair Value, ending balance 15,288 [12],[13],[28]     $ 15,040 [15],[16],[27]                
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                        
Principal Amount or Par Value 7,027 [12],[22],[25]     13,444 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 13,444                      
Fair Value, ending balance $ 7,027 [12],[25]     $ 13,444 [15],[24]                
Spread 8.25% [12],[25]     8.25% [15],[24] 8.25% [12],[25] 8.25% [12],[25] 8.25% [15],[24] 8.25% [15],[24]        
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 1,300                      
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] 1,348                      
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 700                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 700                      
Fair Value, ending balance [15],[16],[18]       $ 700                
Spread [15],[16],[18]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                        
Principal Amount or Par Value 1,969 [12],[13],[21],[22]     $ 1,969 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                        
Principal Amount or Par Value 19,110 [12],[22],[23]     19,159 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 19,159                      
Fair Value, ending balance $ 19,110 [12],[23]     $ 19,159 [15],[19]                
Spread 5.25% [12],[23]     5.50% [15],[19] 5.25% [12],[23] 5.25% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                        
Principal Amount or Par Value $ 5,317 [12],[22],[23]     $ 5,331 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 5,331                      
Fair Value, ending balance $ 5,317 [12],[23]     $ 5,331 [15],[19]                
Spread 5.25% [12],[23]     5.50% [15],[19] 5.25% [12],[23] 5.25% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 3                        
Principal Amount or Par Value [12],[13],[22] $ 698                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 698                      
Spread [12],[13] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                        
Principal Amount or Par Value $ 31,406                      
Number of investments held | investment 2       2 2            
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                        
Principal Amount or Par Value [14],[15],[16],[17],[18]       $ 2,652                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [14],[15],[16],[18] $ 0                      
Fair Value, ending balance [14],[15],[16],[18]       0                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                        
Principal Amount or Par Value [11],[12],[13],[21],[22] 2,652                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [11],[12],[13],[21] 0                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                        
Principal Amount or Par Value 29,879 [12],[22],[23]     29,879 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 20,586                      
Fair Value, ending balance $ 20,446 [12],[23]     $ 20,586 [15],[19]                
Spread 0.50% [12],[23],[29],[30]     0.50% [15],[19],[31],[32] 0.50% [12],[23],[29],[30] 0.50% [12],[23],[29],[30] 0.50% [15],[19],[31],[32] 0.50% [15],[19],[31],[32]        
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                        
Principal Amount or Par Value $ 1,527 [12],[13],[22]     $ 1,527 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 0                      
Fair Value, ending balance $ 0 [12],[13]     $ 0 [15],[16]                
Spread 0.50% [12],[13],[29],[30]     0.50% [15],[16],[31],[32] 0.50% [12],[13],[29],[30] 0.50% [12],[13],[29],[30] 0.50% [15],[16],[31],[32] 0.50% [15],[16],[31],[32]        
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                        
Principal Amount or Par Value                 $ 17,927 $ 13,479    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Non-accrual status                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance $ 20,446                      
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                        
Principal Amount or Par Value 5,230 [12],[13],[22]     $ 5,230 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 0                      
Fair Value, ending balance 0 [12],[13]     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 10,618 [12],[22],[25]     10,618 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 10,618                      
Fair Value, ending balance $ 10,618 [12],[25]     $ 10,618 [15],[19]                
Spread 6.50% [12],[25]     6.50% [15],[19] 6.50% [12],[25] 6.50% [12],[25] 6.50% [15],[19] 6.50% [15],[19]        
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[33] $ 0                      
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[34] 0                      
Fair Value, ending balance [15],[34]       $ 0                
Investment, Identifier [Axis]: Appriss Health Holdings, Inc, Wholly-owned subsidiaries                        
Number of investments held | investment       2     2 2        
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc., Preferred shares                        
Preferred equity dividend rate       11.00%                
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc., Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 2,863                      
Fair Value, ending balance [15],[16]       $ 2,863                
Investment, Identifier [Axis]: Appriss Health, LLC, First lien                        
Principal Amount or Par Value [15],[17],[24],[35]       6,188                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24],[35] 6,188                      
Fair Value, ending balance [15],[24],[35]       $ 6,188                
Spread [15],[24],[35]       6.75%     6.75% 6.75%        
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18],[35]       $ 417                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18],[35] 0                      
Fair Value, ending balance [15],[16],[18],[35]       0                
Investment, Identifier [Axis]: Associations, Inc., First Lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] 1,819                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 1,819                      
Spread [12],[13],[21] 6.50%       6.50% 6.50%            
Investment, Identifier [Axis]: Associations, Inc., First Lien 1                        
Principal Amount or Par Value [12],[22],[23] $ 33,837                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 33,837                      
Spread [12],[23],[30] 4.00%       4.00% 4.00%            
Investment, Identifier [Axis]: Associations, Inc., First Lien 2                        
Principal Amount or Par Value [12],[22],[23] $ 9,071                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 9,071                      
Spread [12],[23],[30] 4.00%       4.00% 4.00%            
Investment, Identifier [Axis]: Associations, Inc., First Lien 3                        
Principal Amount or Par Value [12],[22],[25] $ 9,071                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 9,071                      
Spread [12],[25],[30] 4.00%       4.00% 4.00%            
Investment, Identifier [Axis]: Associations, Inc., First Lien 4                        
Principal Amount or Par Value [12],[22],[25] $ 5,478                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 5,478                      
Spread [12],[25],[30] 4.00%       4.00% 4.00%            
Investment, Identifier [Axis]: Associations, Inc., First Lien 5                        
Principal Amount or Par Value [12],[22],[25] $ 4,358                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 4,358                      
Spread [12],[25],[30] 4.00%       4.00% 4.00%            
Investment, Identifier [Axis]: Associations, Inc., First Lien 6                        
Principal Amount or Par Value [12],[22],[23] $ 4,137                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 4,137                      
Spread [12],[23],[30] 4.00%       4.00% 4.00%            
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       1,252                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 1,252                      
Fair Value, ending balance [15],[16],[18]       $ 1,252                
Spread [15],[16],[18]       6.50%     6.50% 6.50%        
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 2,291                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 1,724                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Associations, Inc., First lien 1                        
Principal Amount or Par Value [15],[17],[19]       33,701                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 33,701                      
Fair Value, ending balance [15],[19]       $ 33,701                
Spread [15],[19],[32]       4.00%     4.00% 4.00%        
Investment, Identifier [Axis]: Associations, Inc., First lien 2                        
Principal Amount or Par Value [15],[17],[19]       $ 9,037                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 9,037                      
Fair Value, ending balance [15],[19]       $ 9,037                
Spread [15],[19],[32]       4.00%     4.00% 4.00%        
Investment, Identifier [Axis]: Associations, Inc., First lien 3                        
Principal Amount or Par Value [15],[17],[24]       $ 9,036                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 9,036                      
Fair Value, ending balance [15],[24]       $ 9,036                
Spread [15],[24],[32]       4.00%     4.00% 4.00%        
Investment, Identifier [Axis]: Associations, Inc., First lien 4                        
Principal Amount or Par Value [15],[17],[24]       $ 5,457                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 5,457                      
Fair Value, ending balance [15],[24]       $ 5,457                
Spread [15],[24],[32]       4.00%     4.00% 4.00%        
Investment, Identifier [Axis]: Associations, Inc., First lien 5                        
Principal Amount or Par Value [15],[17],[24]       $ 4,341                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 4,341                      
Fair Value, ending balance [15],[24]       $ 4,341                
Spread [15],[24],[32]       4.00%     4.00% 4.00%        
Investment, Identifier [Axis]: Associations, Inc., First lien 6                        
Principal Amount or Par Value [15],[17],[19]       $ 4,121                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 4,121                      
Fair Value, ending balance [15],[19]       $ 4,121                
Spread [15],[19],[32]       4.00%     4.00% 4.00%        
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                        
Principal Amount or Par Value 34,459 [12],[22],[25],[36]     $ 34,459 [15],[17],[24],[37]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24],[37] 34,458                      
Fair Value, ending balance $ 34,459 [12],[25],[36]     $ 34,458 [15],[24],[37]                
Spread 8.25% [12],[25],[36]     8.25% [15],[24],[37] 8.25% [12],[25],[36] 8.25% [12],[25],[36] 8.25% [15],[24],[37] 8.25% [15],[24],[37]        
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First Lien 1                        
Principal Amount or Par Value [12],[22],[25] $ 3,454                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 3,454                      
Spread [12],[25] 7.25%       7.25% 7.25%            
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First Lien 2                        
Principal Amount or Par Value [12],[22],[25] $ 1,345                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 1,332                      
Spread [12],[25] 6.75%       6.75% 6.75%            
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                        
Principal Amount or Par Value $ 320 [12],[13],[21],[22],[36]     $ 320 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21],[36]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 1                        
Principal Amount or Par Value [15],[17],[19]       3,454                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 3,454                      
Fair Value, ending balance [15],[19]       $ 3,454                
Spread [15],[19]       7.25%     7.25% 7.25%        
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 2                        
Principal Amount or Par Value [17],[19]       $ 1,345                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [19] 1,332                      
Fair Value, ending balance [19]       $ 1,332                
Spread [19]       6.75%     6.75% 6.75%        
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                        
Principal Amount or Par Value 21,791 [12],[22],[25]     $ 21,847 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 21,473                      
Fair Value, ending balance $ 21,436 [12],[25]     $ 21,473 [15],[24]                
Spread 5.75% [12],[25]     5.75% [15],[24] 5.75% [12],[25] 5.75% [12],[25] 5.75% [15],[24] 5.75% [15],[24]        
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                        
Principal Amount or Par Value $ 14,737 [12],[22],[23]     $ 14,774 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 14,522                      
Fair Value, ending balance $ 14,497 [12],[23]     $ 14,522 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: Avalara, Inc., First lien                        
Principal Amount or Par Value [15],[17],[24]       $ 17,198                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] $ 17,198                      
Fair Value, ending balance [15],[24]       $ 17,198                
Spread [15],[24]       7.25%     7.25% 7.25%        
Investment, Identifier [Axis]: Avalara, Inc., First lien                        
Principal Amount or Par Value [12],[22],[25] 17,198                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 17,198                      
Spread [12],[25] 7.25%       7.25% 7.25%            
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                        
Principal Amount or Par Value $ 1,720 [12],[13],[21],[22]     $ 1,720 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[36] 12,534                      
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 11,742                      
Fair Value, ending balance [15],[16]       11,742                
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien                        
Principal Amount or Par Value [12],[22],[25] 6,172                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 6,172                      
Spread [12],[25] 7.00%       7.00% 7.00%            
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 42                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 42                      
Spread [12],[13],[21] 6.00%       6.00% 6.00%            
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22],[38] $ 375                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21],[38] 0                      
Investment, Identifier [Axis]: Bamboo Health Intermediate Holdings (fka Appriss Health Intermediate Holdings, Inc.), Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[38] 2,945                      
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien                        
Principal Amount or Par Value [12],[22],[39] 20,171                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39] $ 20,070                      
Spread [12],[39] 5.00%       5.00% 5.00%            
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 1,146                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (6)                      
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 1                        
Principal Amount or Par Value 2,292 [12],[21],[22],[39]     2,292 [15],[18],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[40] 0                      
Fair Value, ending balance 0 [12],[21],[39]     0 [15],[18],[40]                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 3                        
Principal Amount or Par Value [15],[17],[40]       20,171                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 20,070                      
Fair Value, ending balance [15],[40]       $ 20,070                
Spread [15],[40]       5.00%     5.00% 5.00%        
Investment, Identifier [Axis]: Brave Parent Holdings, Inc.n, First lien - Undrawn 2                        
Principal Amount or Par Value [15],[16],[18]       $ 1,146                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (6)                      
Fair Value, ending balance [15],[16],[18]       (6)                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       852                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 852                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                        
Principal Amount or Par Value 16,444 [12],[22],[23]     16,487 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 16,487                      
Fair Value, ending balance $ 16,444 [12],[23]     $ 16,487 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                        
Principal Amount or Par Value $ 3,398 [12],[22],[23]     $ 3,407 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 3,407                      
Fair Value, ending balance $ 3,398 [12],[23]     $ 3,407 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                        
Principal Amount or Par Value $ 761 [12],[22],[23]     $ 763 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 763                      
Fair Value, ending balance $ 761 [12],[23]     $ 763 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                        
Principal Amount or Par Value $ 341 [12],[22],[23]     $ 342 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 342                      
Fair Value, ending balance $ 341 [12],[23]     $ 342 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                        
Principal Amount or Par Value $ 272 [12],[22],[23]     $ 273 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 273                      
Fair Value, ending balance $ 272 [12],[23]     $ 273 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                        
Principal Amount or Par Value $ 11,193 [12],[22],[23]     $ 11,188 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 9,775                      
Fair Value, ending balance $ 10,326 [12],[23]     $ 9,775 [15],[19]                
Spread 6.25% [12],[23],[30]     6.25% [15],[19],[32] 6.25% [12],[23],[30] 6.25% [12],[23],[30] 6.25% [15],[19],[32] 6.25% [15],[19],[32]        
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                        
Principal Amount or Par Value $ 3,334 [12],[22],[23]     $ 3,333 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 2,912                      
Fair Value, ending balance $ 3,076 [12],[23]     $ 2,912 [15],[19]                
Spread 6.25% [12],[23],[30]     6.25% [15],[19],[32] 6.25% [12],[23],[30] 6.25% [12],[23],[30] 6.25% [15],[19],[32] 6.25% [15],[19],[32]        
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                        
Principal Amount or Par Value [15],[17],[19]       $ 8,403                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] $ 8,039                      
Fair Value, ending balance [15],[19]       $ 8,039                
Spread [15],[19]       6.75%     6.75% 6.75%        
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                        
Principal Amount or Par Value [12],[22],[23] 8,425                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 8,313                      
Spread [12],[23],[30] 6.75%       6.75% 6.75%            
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                        
Principal Amount or Par Value $ 940 [12],[13],[21],[22]     $ 935 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 894                      
Fair Value, ending balance $ 927 [12],[13],[21]     $ 894 [15],[16],[18]                
Spread 6.75% [12],[13],[21],[30]     6.75% [15],[16],[18] 6.75% [12],[13],[21],[30] 6.75% [12],[13],[21],[30] 6.75% [15],[16],[18] 6.75% [15],[16],[18]        
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[18]       $ 226                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ (10)                      
Fair Value, ending balance [15],[16],[18]       (10)                
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21] 226                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (3)                      
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 1                        
Principal Amount or Par Value [15],[17],[20]       7,012                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 7,012                      
Fair Value, ending balance [15],[20]       $ 7,012                
Spread [15],[20]       8.75%     8.75% 8.75%        
Investment, Identifier [Axis]: CHA Holdings, Inc., Second lien 2                        
Principal Amount or Par Value [15],[16],[17]       $ 4,453                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 4,454                      
Fair Value, ending balance [15],[16]       $ 4,454                
Spread [15],[16]       8.75%     8.75% 8.75%        
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 1                        
Principal Amount or Par Value 18,266 [12],[13],[22]     $ 18,266 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 18,184                      
Fair Value, ending balance $ 18,266 [12],[13]     $ 18,184 [15],[16]                
Spread 7.25% [12],[13]     7.25% [15],[16] 7.25% [12],[13] 7.25% [12],[13] 7.25% [15],[16] 7.25% [15],[16]        
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., Second lien 2                        
Principal Amount or Par Value $ 7,500 [12],[22],[25]     $ 7,500 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 7,467                      
Fair Value, ending balance $ 7,500 [12],[25]     $ 7,467 [15],[24]                
Spread 7.25% [12],[25]     7.25% [15],[24] 7.25% [12],[25] 7.25% [12],[25] 7.25% [15],[24] 7.25% [15],[24]        
Investment, Identifier [Axis]: Calabrio, Inc., First lien                        
Principal Amount or Par Value [17],[40]       $ 12,347                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [40] $ 12,224                      
Fair Value, ending balance [40]       $ 12,224                
Spread [40]       7.13%     7.13% 7.13%        
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                        
Principal Amount or Par Value [16],[17],[18]       $ 850                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16],[18] 841                      
Fair Value, ending balance [16],[18]       $ 841                
Spread [16],[18]       7.13%     7.13% 7.13%        
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                        
Principal Amount or Par Value 1,487 [12],[13],[21],[22]     $ 637 [16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16],[18] (6)                      
Fair Value, ending balance (14) [12],[13],[21]     (6) [16],[18]                
Investment, Identifier [Axis]: Calabrio, Inc., First lien 1                        
Principal Amount or Par Value [12],[22],[39] 12,347                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39] $ 12,230                      
Spread [12],[39] 7.13%       7.13% 7.13%            
Investment, Identifier [Axis]: Calabrio, Inc., First lien 2                        
Principal Amount or Par Value [12],[22],[39] $ 1,582                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39] $ 1,566                      
Spread [12],[39] 7.13%       7.13% 7.13%            
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                        
Principal Amount or Par Value [22],[26] $ 11,822                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [26] $ 11,083                      
Spread [26] 4.50%       4.50% 4.50%            
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien 1                        
Principal Amount or Par Value [17],[20]       11,852                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [20] $ 10,919                      
Fair Value, ending balance [20]       $ 10,919                
Spread [20]       4.50%     4.50% 4.50%        
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                        
Principal Amount or Par Value 9,767 [12],[22],[26]     $ 9,767 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 8,975                      
Fair Value, ending balance $ 9,051 [12],[26]     $ 8,975 [15],[20]                
Spread 7.75% [12],[26]     7.75% [15],[20] 7.75% [12],[26] 7.75% [12],[26] 7.75% [15],[20] 7.75% [15],[20]        
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second Lien 1                        
Principal Amount or Par Value $ 47,838 [13],[22]     $ 47,838 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 45,072                      
Fair Value, ending balance $ 47,838 [13]     $ 45,072 [15],[16]                
Spread 7.50% [13]     7.50% [15],[16] 7.50% [13] 7.50% [13] 7.50% [15],[16] 7.50% [15],[16]        
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second Lien 2                        
Principal Amount or Par Value $ 7,500 [22],[25]     $ 7,500 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 7,066                      
Fair Value, ending balance $ 7,500 [25]     $ 7,066 [15],[24]                
Spread 7.50% [25]     7.50% [15],[24] 7.50% [25] 7.50% [25] 7.50% [15],[24] 7.50% [15],[24]        
Investment, Identifier [Axis]: Ciklum Inc., First lien                        
Principal Amount or Par Value [12],[22],[23],[36] $ 9,608                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23],[36] $ 9,488                      
Spread [12],[23],[36] 7.00%       7.00% 7.00%            
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 1                        
Principal Amount or Par Value [12],[13],[21],[22] $ 11,955                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 2                        
Principal Amount or Par Value [12],[13],[21],[22] 2,989                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (37)                      
Investment, Identifier [Axis]: CommerceHub, Inc., First lien                        
Principal Amount or Par Value 3,950 [12],[13],[22]     $ 3,960 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 3,960                      
Fair Value, ending balance $ 3,950 [12],[13]     $ 3,960 [15],[16]                
Spread 6.25% [12],[13]     6.25% [15],[16] 6.25% [12],[13] 6.25% [12],[13] 6.25% [15],[16] 6.25% [15],[16]        
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien                        
Principal Amount or Par Value $ 7,073 [12],[22],[23]     $ 7,091 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 6,899                      
Fair Value, ending balance $ 6,943 [12],[23]     $ 6,899 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 425                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (8)                      
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value [15],[16],[18]       $ 425                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (11)                      
Fair Value, ending balance [15],[16],[18]       (11)                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value [15],[16],[18]       849                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (23)                      
Fair Value, ending balance [15],[16],[18]       (23)                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                        
Principal Amount or Par Value 18,974 [12],[22],[26]     19,022 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 16,768                      
Fair Value, ending balance $ 16,506 [12],[26]     $ 16,768 [15],[20]                
Spread 5.25% [12],[26]     5.25% [15],[20] 5.25% [12],[26] 5.25% [12],[26] 5.25% [15],[20] 5.25% [15],[20]        
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                        
Principal Amount or Par Value $ 3,168 [12],[22],[26]     $ 3,176 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 2,800                      
Fair Value, ending balance $ 2,756 [12],[26]     $ 2,800 [15],[20]                
Spread 5.25% [12],[26]     5.25% [15],[20] 5.25% [12],[26] 5.25% [12],[26] 5.25% [15],[20] 5.25% [15],[20]        
Investment, Identifier [Axis]: Coupa Holdings, LLC First lien - Undrawn 1                        
Principal Amount or Par Value [12],[13],[21],[22] $ 1,291                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 26                      
Investment, Identifier [Axis]: Coupa Holdings, LLC First lien - Undrawn 2                        
Principal Amount or Par Value [12],[13],[21],[22] 989                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien                        
Principal Amount or Par Value [12],[22],[25] 14,460                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 14,749                      
Spread [12],[25] 7.50%       7.50% 7.50%            
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 1,291                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 13                      
Fair Value, ending balance [15],[16],[18]       13                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value [15],[16],[17],[18]       989                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 1                        
Principal Amount or Par Value [15],[17],[19]       7,230                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 7,303                      
Fair Value, ending balance [15],[19]       $ 7,303                
Spread [15],[19]       7.50%     7.50% 7.50%        
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien 2                        
Principal Amount or Par Value [15],[17],[24]       $ 7,230                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 7,303                      
Fair Value, ending balance [15],[24]       $ 7,303                
Spread [15],[24]       7.50%     7.50% 7.50%        
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                        
Principal Amount or Par Value [16],[17],[18]       $ 1,013                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16],[18] 0                      
Fair Value, ending balance [16],[18]       0                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 1                        
Principal Amount or Par Value [17],[40]       13,653                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [40] 13,653                      
Fair Value, ending balance [40]       $ 13,653                
Spread [40]       6.00%     6.00% 6.00%        
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien 2                        
Principal Amount or Par Value [17],[40]       $ 2,457                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [40] 2,457                      
Fair Value, ending balance [40]       $ 2,457                
Spread [40]       8.00%     8.00% 8.00%        
Investment, Identifier [Axis]: Cube Industrials Buyer Inc., First lien                        
Principal Amount or Par Value [12],[13],[22] 4,483                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 4,450                      
Spread [12],[13] 6.00%       6.00% 6.00%            
Investment, Identifier [Axis]: Cube Industrials Buyer Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21] $ 517                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (4)                      
Investment, Identifier [Axis]: Cube Industrials Buyer, Inc., First lien                        
Principal Amount or Par Value [15],[16],[17]       $ 4,483                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 4,450                      
Fair Value, ending balance [15],[16]       $ 4,450                
Spread [15],[16]       6.00%     6.00% 6.00%        
Investment, Identifier [Axis]: Cube Industrials Buyer, Inc., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[18]       $ 517                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (4)                      
Fair Value, ending balance [15],[16],[18]       (4)                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien                        
Principal Amount or Par Value [15],[17],[19]       1,823                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 1,768                      
Fair Value, ending balance [15],[19]       $ 1,768                
Spread [15],[19]       6.41%     6.41% 6.41%        
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 1,021                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 992                      
Fair Value, ending balance [15],[16],[18]       $ 992                
Spread [15],[16],[18]       6.50%     6.50% 6.50%        
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                        
Principal Amount or Par Value [12],[22],[23] 1,818                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 1,793                      
Spread [12],[23] 6.41%       6.41% 6.41%            
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                        
Principal Amount or Par Value [12],[13],[22] $ 1,018                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 1,006                      
Spread [12],[13] 6.50%       6.50% 6.50%            
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                        
Principal Amount or Par Value [16],[17]       $ 20,313                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16] $ 18,333                      
Fair Value, ending balance [16]       $ 18,333                
Spread [16]       6.75%     6.75% 6.75%        
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                        
Principal Amount or Par Value [13],[22] 20,313                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [13] $ 19,060                      
Spread [13] 6.75%       6.75% 6.75%            
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[18]       $ 2,405                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ (43)                      
Fair Value, ending balance [15],[16],[18]       (43)                
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 2,405                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (19)                      
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                        
Principal Amount or Par Value 18,525 [12],[22],[25]     18,572 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 18,238                      
Fair Value, ending balance $ 18,379 [12],[25]     $ 18,238 [15],[24]                
Spread 5.75% [12],[25]     5.75% [15],[24] 5.75% [12],[25] 5.75% [12],[25] 5.75% [15],[24] 5.75% [15],[24]        
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                        
Principal Amount or Par Value $ 6,937 [12],[22],[26]     $ 6,955 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 6,830                      
Fair Value, ending balance $ 6,883 [12],[26]     $ 6,830 [15],[20]                
Spread 5.75% [12],[26]     5.75% [15],[20] 5.75% [12],[26] 5.75% [12],[26] 5.75% [15],[20] 5.75% [15],[20]        
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First lien                        
Principal Amount or Par Value $ 7,453 [12],[22],[23]     $ 7,472 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 7,564                      
Fair Value, ending balance $ 7,453 [12],[23]     $ 7,564 [15],[19]                
Spread 7.00% [12],[23]     7.00% [15],[19] 7.00% [12],[23] 7.00% [12],[23] 7.00% [15],[19] 7.00% [15],[19]        
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn 1                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 66                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 66                      
Fair Value, ending balance [15],[16],[18]       $ 66                
Spread [15],[16],[18]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn 2                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 66                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 66                      
Fair Value, ending balance [15],[16],[18]       $ 66                
Spread [15],[16],[18]       4.50%     4.50% 4.50%        
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn 1                        
Principal Amount or Par Value [12],[13],[21],[22] 65                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 65                      
Spread [12],[13],[21] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Drawn 2                        
Principal Amount or Par Value [12],[13],[21],[22] $ 58                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 58                      
Spread [12],[13],[21] 4.50%       4.50% 4.50%            
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                        
Principal Amount or Par Value $ 459 [12],[13],[21],[22]     $ 459 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                        
Principal Amount or Par Value 928 [12],[13],[21],[22]     920 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                        
Principal Amount or Par Value 12,978 [12],[22],[25]     13,011 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 13,011                      
Fair Value, ending balance $ 12,978 [12],[25]     $ 13,011 [15],[24]                
Spread 5.50% [12],[25]     5.50% [15],[24] 5.50% [12],[25] 5.50% [12],[25] 5.50% [15],[24] 5.50% [15],[24]        
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                        
Principal Amount or Par Value $ 1,093 [12],[22],[23]     $ 1,096 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 1,096                      
Fair Value, ending balance $ 1,093 [12],[23]     $ 1,096 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                        
Principal Amount or Par Value [12],[13],[22] $ 56,271                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 74,768                      
Fair Value, ending balance 75,568 [12],[13]     $ 74,768 [15],[16]                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien - Drawn                        
Principal Amount or Par Value 3,027 [12],[13],[21],[22]     2,623 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 2,576                      
Fair Value, ending balance $ 2,981 [12],[13],[21]     $ 2,576 [15],[16],[18]                
Spread 5.75% [12],[13],[21]     5.75% [15],[16],[18] 5.75% [12],[13],[21] 5.75% [12],[13],[21] 5.75% [15],[16],[18] 5.75% [15],[16],[18]        
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 1                        
Principal Amount or Par Value $ 37,381 [12],[22],[23]     $ 37,477 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 36,791                      
Fair Value, ending balance $ 36,813 [12],[23]     $ 36,791 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 2                        
Principal Amount or Par Value $ 3,935 [12],[13],[22]     $ 3,945 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 3,873                      
Fair Value, ending balance $ 3,875 [12],[13]     $ 3,873 [15],[16]                
Spread 5.75% [12],[13]     5.75% [15],[16] 5.75% [12],[13] 5.75% [12],[13] 5.75% [15],[16] 5.75% [15],[16]        
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[18]       $ 404                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ (7)                      
Fair Value, ending balance [15],[16],[18]       $ (7)                
Investment, Identifier [Axis]: Diamond Parent Holdings Corp, Wholly-owned subsidiaries                        
Number of investments held | investment 2     2 2 2 2 2        
Investment, Identifier [Axis]: Diligent Corporation , First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[18]       $ 1,667                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ (33)                      
Fair Value, ending balance [15],[16],[18]       $ (33)                
Investment, Identifier [Axis]: Diligent Corporation , First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22],[41] 2,029                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21],[41] $ 0                      
Investment, Identifier [Axis]: Diligent Corporation, First lien                        
Number of investments held | investment 3     3 3 3 3 3        
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 1,595                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 1,595                      
Spread [12],[13],[21] 6.25%       6.25% 6.25%            
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 1,957                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 1,919                      
Fair Value, ending balance [15],[16],[18]       $ 1,919                
Spread [15],[16],[18]       6.25%     6.25% 6.25%        
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                        
Principal Amount or Par Value 17,360 [12],[22],[23]     $ 17,404 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 16,998                      
Fair Value, ending balance $ 17,360 [12],[23]     $ 16,998 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                        
Principal Amount or Par Value $ 5,753 [12],[13],[22]     $ 5,768 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 5,654                      
Fair Value, ending balance $ 5,753 [12],[13]     $ 5,654 [15],[16]                
Spread 6.25% [12],[13]     6.25% [15],[16] 6.25% [12],[13] 6.25% [12],[13] 6.25% [15],[16] 6.25% [15],[16]        
Investment, Identifier [Axis]: Diligent Corporation, First lien 3                        
Principal Amount or Par Value $ 5,664 [12],[22],[23]     $ 5,679 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 5,546                      
Fair Value, ending balance $ 5,664 [12],[23]     $ 5,546 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                        
Preferred equity dividend rate       10.50%                
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[42] $ 12,162                      
Fair Value, ending balance 12,464 [12],[13],[41]     $ 12,162 [15],[16],[42]                
Investment, Identifier [Axis]: EAB Global, Inc., Second lien                        
Principal Amount or Par Value 14,868 [12],[22],[23]     14,868 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 14,868                      
Fair Value, ending balance $ 14,868 [12],[23]     $ 14,868 [15],[19]                
Spread 6.50% [12],[23]     6.50% [15],[19] 6.50% [12],[23] 6.50% [12],[23] 6.50% [15],[19] 6.50% [15],[19]        
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                        
Principal Amount or Par Value $ 10,676 [12],[22],[23]     $ 10,676 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 10,676                      
Fair Value, ending balance $ 10,676 [12],[23]     10,676 [15],[19]                
Spread [12],[23] 7.50%       7.50% 7.50%            
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 2                        
Principal Amount or Par Value $ 342 [12],[13],[22]     342 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 342                      
Fair Value, ending balance $ 342 [12],[13]     342 [15],[16]                
Spread [12],[13] 7.50%       7.50% 7.50%            
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] $ 6,855                      
Fair Value, ending balance 8,378 [12],[13]     6,855 [15],[16]                
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                        
Principal Amount or Par Value 19,470 [12],[13],[22],[43]     18,635 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 18,635                      
Fair Value, ending balance $ 19,471 [12],[13],[43]     $ 18,635 [15],[16]                
Spread [15],[16]       7.50%     7.50% 7.50%        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien                        
Number of investments held | investment 3       3 3            
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 1                        
Principal Amount or Par Value $ 4,952 [12],[13],[21],[22]     $ 4,503 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 4,466                      
Fair Value, ending balance $ 4,952 [12],[13],[21]     $ 4,466 [15],[16],[18]                
Spread 6.00% [12],[13],[21]     6.00% [15],[16],[18] 6.00% [12],[13],[21] 6.00% [12],[13],[21] 6.00% [15],[16],[18] 6.00% [15],[16],[18]        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Drawn 2                        
Principal Amount or Par Value $ 1,295 [12],[13],[21],[22]     $ 315 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 310                      
Fair Value, ending balance $ 1,295 [12],[13],[21]     $ 310 [15],[16],[18]                
Spread 5.75% [12],[13],[21]     5.75% [15],[16],[18] 5.75% [12],[13],[21] 5.75% [12],[13],[21] 5.75% [15],[16],[18] 5.75% [15],[16],[18]        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value $ 769 [12],[13],[21],[22]     $ 1,229 [15],[18],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[20] (10)                      
Fair Value, ending balance 0 [12],[13],[21]     (10) [15],[18],[20]                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value [15],[16],[18]       1,085                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (17)                      
Fair Value, ending balance [15],[16],[18]       (17)                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value [12],[13],[21],[22] 105                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                        
Principal Amount or Par Value 10,264 [12],[22],[39]     10,290 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 10,125                      
Fair Value, ending balance $ 10,264 [12],[39]     $ 10,125 [15],[40]                
Spread 5.75% [12],[39]     5.75% [15],[40] 5.75% [12],[39] 5.75% [12],[39] 5.75% [15],[40] 5.75% [15],[40]        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                        
Principal Amount or Par Value $ 3,445 [12],[22],[39]     $ 3,454 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 3,398                      
Fair Value, ending balance $ 3,445 [12],[39]     $ 3,398 [15],[40]                
Spread 5.75% [12],[39]     5.75% [15],[40] 5.75% [12],[39] 5.75% [12],[39] 5.75% [15],[40] 5.75% [15],[40]        
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                        
Principal Amount or Par Value $ 3,423 [12],[22],[39]     $ 3,432 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 3,378                      
Fair Value, ending balance $ 3,423 [12],[39]     $ 3,378 [15],[40]                
Spread 5.75% [12],[39]     5.75% [15],[40] 5.75% [12],[39] 5.75% [12],[39] 5.75% [15],[40] 5.75% [15],[40]        
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC , Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40],[44] $ 4,454                      
Fair Value, ending balance [15],[40],[44]       $ 4,454                
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39],[45] 4,435                      
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       1,006                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 1,006                      
Fair Value, ending balance [15],[16],[18]       $ 1,006                
Spread [15],[16],[18]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value 2,497 [12],[13],[21],[22]     $ 4,557 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value 3,474 [13],[21],[22]     1,090 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 3                        
Principal Amount or Par Value [12],[13],[21],[22] 2,095                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                        
Principal Amount or Par Value 33,612 [12],[22],[23]     33,698 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 33,698                      
Fair Value, ending balance $ 33,612 [12],[23]     $ 33,698 [15],[19]                
Spread 5.25% [12],[23]     5.50% [15],[19] 5.25% [12],[23] 5.25% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                        
Principal Amount or Par Value $ 2,401 [12],[13],[22]     $ 347 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 347                      
Fair Value, ending balance $ 2,401 [12],[13]     $ 347 [15],[16]                
Spread 5.25% [12],[13]     5.50% [15],[16] 5.25% [12],[13] 5.25% [12],[13] 5.50% [15],[16] 5.50% [15],[16]        
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 1                        
Principal Amount or Par Value $ 741 [12],[13],[21],[22]     $ 143 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 142                      
Fair Value, ending balance $ 741 [12],[13],[21]     $ 142 [15],[16],[18]                
Spread 5.50% [12],[13],[21]     5.50% [15],[16],[18] 5.50% [12],[13],[21] 5.50% [12],[13],[21] 5.50% [15],[16],[18] 5.50% [15],[16],[18]        
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 2                        
Principal Amount or Par Value $ 143 [12],[13],[21],[22]     $ 138 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 138                      
Fair Value, ending balance $ 143 [12],[13],[21]     $ 138 [15],[16],[18]                
Spread 5.50% [12],[13],[21]     5.50% [15],[16],[18] 5.50% [12],[13],[21] 5.50% [12],[13],[21] 5.50% [15],[16],[18] 5.50% [15],[16],[18]        
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value $ 3,832 [12],[13],[21],[22]     $ 2,718 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (17)                      
Fair Value, ending balance 0 [12],[13],[21]     (17) [15],[16],[18]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value 2,718 [12],[13],[21],[22]     4,435 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (28)                      
Fair Value, ending balance 0 [12],[13],[21]     (28) [15],[16],[18]                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                        
Principal Amount or Par Value 17,308 [12],[22],[23]     17,353 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 17,243                      
Fair Value, ending balance $ 17,308 [12],[23]     $ 17,243 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                        
Principal Amount or Par Value $ 10,067 [12],[22],[25]     $ 10,092 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 10,028                      
Fair Value, ending balance $ 10,067 [12],[25]     $ 10,028 [15],[24]                
Spread 5.50% [12],[25]     5.50% [15],[24] 5.50% [12],[25] 5.50% [12],[25] 5.50% [15],[24] 5.50% [15],[24]        
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                        
Principal Amount or Par Value $ 1,175 [12],[13],[22]     $ 1,178 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 1,171                      
Fair Value, ending balance $ 1,175 [12],[13]     $ 1,171 [15],[16]                
Spread 5.50% [12],[13]     5.50% [15],[16] 5.50% [12],[13] 5.50% [12],[13] 5.50% [15],[16] 5.50% [15],[16]        
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 4                        
Principal Amount or Par Value $ 80 [12],[13],[22]     $ 80 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 80                      
Fair Value, ending balance $ 80 [12],[13]     $ 80 [15],[16]                
Spread 5.50% [12],[13]     5.50% [15],[16] 5.50% [12],[13] 5.50% [12],[13] 5.50% [15],[16] 5.50% [15],[16]        
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                        
Principal Amount or Par Value $ 22,500 [12],[22],[39]     $ 22,500 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 22,100                      
Fair Value, ending balance $ 22,500 [12],[39]     $ 22,100 [15],[40]                
Spread 6.50% [12],[39]     6.50% [15],[40] 6.50% [12],[39] 6.50% [12],[39] 6.50% [15],[40] 6.50% [15],[40]        
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                        
Principal Amount or Par Value $ 7,009 [12],[22],[23]     $ 7,009 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 6,884                      
Fair Value, ending balance $ 7,009 [12],[23]     $ 6,884 [15],[19]                
Spread 6.50% [12],[23]     6.50% [15],[19] 6.50% [12],[23] 6.50% [12],[23] 6.50% [15],[19] 6.50% [15],[19]        
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien - Drawn                        
Principal Amount or Par Value [15],[17],[18],[19]       $ 451                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] $ 451                      
Fair Value, ending balance [15],[18],[19]       $ 451                
Spread [15],[18],[19]       6.00%     6.00% 6.00%        
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien 1                        
Principal Amount or Par Value 40,169 [12],[22],[23]     $ 40,270 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 40,270                      
Fair Value, ending balance $ 40,169 [12],[23]     $ 40,270 [15],[19]                
Spread 5.25% [12],[23]     6.00% [15],[19] 5.25% [12],[23] 5.25% [12],[23] 6.00% [15],[19] 6.00% [15],[19]        
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First Lien 2                        
Principal Amount or Par Value $ 21,611 [12],[22],[39]     $ 21,666 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 21,666                      
Fair Value, ending balance $ 21,611 [12],[39]     $ 21,666 [15],[40]                
Spread 5.25% [12],[39]     6.00% [15],[40] 5.25% [12],[39] 5.25% [12],[39] 6.00% [15],[40] 6.00% [15],[40]        
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn                        
Principal Amount or Par Value $ 3,951 [12],[13],[21]     $ 3,951 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 3                        
Principal Amount or Par Value [12],[22],[23] 450                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 450                      
Spread [12],[23] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: GEDC Equity, LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 100                      
Investment, Identifier [Axis]: GEDC Equity, LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 150                      
Fair Value, ending balance [15],[16]       150                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First Lien 1                        
Principal Amount or Par Value 34,993 [22],[23]     34,023 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 34,023                      
Fair Value, ending balance $ 35,080 [23]     $ 34,023 [15],[19]                
Spread 5.00% [23]     5.50% [15],[19] 5.00% [23] 5.00% [23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First Lien 2                        
Principal Amount or Par Value $ 21,465 [22],[39]     $ 21,521 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 21,521                      
Fair Value, ending balance $ 21,519 [39]     $ 21,521 [15],[40]                
Spread 5.00% [39]     5.50% [15],[40] 5.00% [39] 5.00% [39] 5.50% [15],[40] 5.50% [15],[40]        
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 3,730                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value [13],[21],[22] 4,821                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [13],[21] (12)                      
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 3                        
Principal Amount or Par Value [13],[21],[22] 4,365                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [13],[21] 0                      
Investment, Identifier [Axis]: Granicus, Inc., First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       579                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 579                      
Fair Value, ending balance [15],[16],[18]       $ 579                
Spread [15],[16],[18]       6.50%     6.50% 6.50%        
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 1,834                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Granicus, Inc., First lien 1                        
Principal Amount or Par Value [15],[17],[20]       15,463                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 15,463                      
Fair Value, ending balance [15],[20]       $ 15,463                
Spread [15],[20],[32]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: Granicus, Inc., First lien 2                        
Principal Amount or Par Value [15],[17],[24]       $ 5,981                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 5,981                      
Fair Value, ending balance [15],[24]       $ 5,981                
Spread [15],[24],[32]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: Granicus, Inc., First lien 3                        
Principal Amount or Par Value [15],[17],[19]       $ 5,899                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 5,899                      
Fair Value, ending balance [15],[19]       $ 5,899                
Spread [15],[19],[32]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: Granicus, Inc., First lien 4                        
Principal Amount or Par Value [15],[17],[19]       $ 4,542                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 4,542                      
Fair Value, ending balance [15],[19]       $ 4,542                
Spread [15],[19]       6.00%     6.00% 6.00%        
Investment, Identifier [Axis]: Greenway Health, LLC, First lien                        
Principal Amount or Par Value 6,349 [12],[22],[25]     $ 6,349 [17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [24] 6,254                      
Fair Value, ending balance $ 6,349 [12],[25]     $ 6,254 [24]                
Spread 6.75% [12],[25]     6.75% [24] 6.75% [12],[25] 6.75% [12],[25] 6.75% [24] 6.75% [24]        
Investment, Identifier [Axis]: Groundworks, LLC, First lien                        
Principal Amount or Par Value $ 19,003 [22],[26]     $ 19,517 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 19,330                      
Fair Value, ending balance $ 18,813 [26]     $ 19,330 [15],[20]                
Spread 3.50% [26]     6.50% [15],[20] 3.50% [26] 3.50% [26] 6.50% [15],[20] 6.50% [15],[20]        
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn                        
Principal Amount or Par Value [21],[22],[26] $ 3,497                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [21],[26] (17)                      
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value [15],[18],[20]       $ 891                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[20] (9)                      
Fair Value, ending balance [15],[18],[20]       (9)                
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value [15],[16],[18]       1,076                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (10)                      
Fair Value, ending balance [15],[16],[18]       (10)                
Investment, Identifier [Axis]: HB Wealth Management, LLC, Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[46] 5,125                      
Fair Value, ending balance $ 6,023 [12],[47]     5,125 [15],[46]                
Spread [12],[47] 4.00%       4.00% 4.00%            
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                        
Principal Amount or Par Value $ 22,500 [12],[22],[39]     22,500 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 21,059                      
Fair Value, ending balance $ 20,846 [12],[39]     $ 21,059 [15],[40]                
Spread 6.75% [12],[39]     6.75% [15],[40] 6.75% [12],[39] 6.75% [12],[39] 6.75% [15],[40] 6.75% [15],[40]        
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                        
Principal Amount or Par Value $ 4,208 [12],[22],[23]     $ 4,208 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 3,938                      
Fair Value, ending balance $ 3,899 [12],[23]     $ 3,938 [15],[19]                
Spread 6.75% [12],[23]     6.75% [15],[19] 6.75% [12],[23] 6.75% [12],[23] 6.75% [15],[19] 6.75% [15],[19]        
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[48] $ 3,323                      
Fair Value, ending balance 3,322 [12],[49]     $ 3,323 [15],[48]                
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Profit Interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[50] 96                      
Fair Value, ending balance 96 [12],[51]     96 [15],[50]                
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                        
Principal Amount or Par Value 8,000 [12],[13],[21],[22]     8,000 [15],[16],[17],[18],[52]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18],[52] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18],[52]                
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien                        
Principal Amount or Par Value 5,108 [12],[22],[25]     5,120 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 5,069                      
Fair Value, ending balance $ 5,055 [12],[25]     $ 5,069 [15],[24]                
Spread 5.75% [12],[25]     5.75% [15],[24] 5.75% [12],[25] 5.75% [12],[25] 5.75% [15],[24] 5.75% [15],[24]        
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien - Undrawn                        
Principal Amount or Par Value $ 1,229 [12],[13],[21],[22]     $ 1,229 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (12)                      
Fair Value, ending balance (12) [12],[13],[21]     (12) [15],[16],[18]                
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 8,000                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien 1                        
Principal Amount or Par Value [12],[22],[25] 2,054                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 2,054                      
Spread [12],[25] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien 2                        
Principal Amount or Par Value [12],[22],[25] $ 1,792                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 1,792                      
Spread [12],[25] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company, First lien                        
Principal Amount or Par Value $ 14,605 [22],[25]     6,822 [17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [24] 6,704                      
Fair Value, ending balance $ 14,498 [25]     $ 6,704 [24]                
Spread 5.25% [25]     5.25% [24] 5.25% [25] 5.25% [25] 5.25% [24] 5.25% [24]        
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                        
Principal Amount or Par Value $ 2,298 [12],[13],[21],[22]     $ 2,298 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                        
Principal Amount or Par Value 28,765 [12],[22],[23]     28,839 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 28,839                      
Fair Value, ending balance $ 28,765 [12],[23]     $ 28,839 [15],[19]                
Spread 6.00% [12],[23]     6.00% [15],[19] 6.00% [12],[23] 6.00% [12],[23] 6.00% [15],[19] 6.00% [15],[19]        
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                        
Principal Amount or Par Value $ 4,203 [12],[22],[23]     $ 4,214 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 4,214                      
Fair Value, ending balance $ 4,203 [12],[23]     $ 4,214 [15],[19]                
Spread 6.00% [12],[23]     6.00% [15],[19] 6.00% [12],[23] 6.00% [12],[23] 6.00% [15],[19] 6.00% [15],[19]        
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 3                        
Principal Amount or Par Value [12],[22],[25] $ 1,699                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 1,699                      
Spread [12],[25] 6.00%       6.00% 6.00%            
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 4                        
Principal Amount or Par Value [12],[22],[25] $ 224                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 224                      
Spread [12],[25] 6.00%       6.00% 6.00%            
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien                        
Principal Amount or Par Value [12],[22],[23] $ 12,812                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 12,716                      
Spread [12],[23] 6.00%       6.00% 6.00%            
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn 1                        
Principal Amount or Par Value $ 1,281 [12],[13],[21],[22]     $ 1,139 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 1,130                      
Fair Value, ending balance $ 1,272 [12],[13],[21]     $ 1,130 [15],[16],[18]                
Spread 6.00% [12],[13],[21]     6.00% [15],[16],[18] 6.00% [12],[13],[21] 6.00% [12],[13],[21] 6.00% [15],[16],[18] 6.00% [15],[16],[18]        
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Drawn 2                        
Principal Amount or Par Value $ 248 [12],[13],[21],[22]     $ 62 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 61                      
Fair Value, ending balance $ 246 [12],[13],[21]     $ 61 [15],[16],[18]                
Spread 6.00% [12],[13],[21]     6.00% [15],[16],[18] 6.00% [12],[13],[21] 6.00% [12],[13],[21] 6.00% [15],[16],[18] 6.00% [15],[16],[18]        
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                        
Principal Amount or Par Value $ 1,301 [12],[13],[21],[22]     $ 1,487 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (12)                      
Fair Value, ending balance (8) [12],[13],[21]     (12) [15],[16],[18]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value 1,805 [12],[13],[21],[22]     1,951 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (16)                      
Fair Value, ending balance (14) [12],[13],[21]     (16) [15],[16],[18]                
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien 1                        
Principal Amount or Par Value [15],[17],[19]       12,844                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 12,742                      
Fair Value, ending balance [15],[19]       $ 12,742                
Spread [15],[19]       6.00%     6.00% 6.00%        
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien                        
Principal Amount or Par Value [12],[22],[25] 8,696                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 8,609                      
Spread [12],[25] 6.50%       6.50% 6.50%            
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 828                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (8)                      
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                        
Principal Amount or Par Value 22,500 [12],[22],[26]     $ 22,500 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 22,500                      
Fair Value, ending balance $ 22,500 [12],[26]     $ 22,500 [15],[20]                
Spread 6.75% [12],[26]     6.75% [15],[20] 6.75% [12],[26] 6.75% [12],[26] 6.75% [15],[20] 6.75% [15],[20]        
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                        
Principal Amount or Par Value $ 3,000 [12],[13],[22]     $ 3,000 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 3,000                      
Fair Value, ending balance $ 3,000 [12],[13]     $ 3,000 [15],[16]                
Spread 6.75% [12],[13]     6.75% [15],[16] 6.75% [12],[13] 6.75% [12],[13] 6.75% [15],[16] 6.75% [15],[16]        
Investment, Identifier [Axis]: Infogain Corporation, First Lien 1                        
Principal Amount or Par Value $ 18,659 [12],[22],[23]     $ 18,707 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 18,707                      
Fair Value, ending balance $ 18,659 [12],[23]     $ 18,707 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Infogain Corporation, First Lien 2                        
Principal Amount or Par Value $ 7,824 [12],[22],[25]     $ 7,844 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 7,844                      
Fair Value, ending balance $ 7,824 [12],[25]     $ 7,844 [15],[24]                
Spread 5.50% [12],[25]     5.50% [15],[24] 5.50% [12],[25] 5.50% [12],[25] 5.50% [15],[24] 5.50% [15],[24]        
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 3,827                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 3,827                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                        
Principal Amount or Par Value 17,245 [12],[13],[22]     17,245 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 17,245                      
Fair Value, ending balance $ 17,245 [12],[13]     $ 17,245 [15],[16]                
Spread 8.25% [12],[13]     8.25% [15],[16] 8.25% [12],[13] 8.25% [12],[13] 8.25% [15],[16] 8.25% [15],[16]        
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                        
Principal Amount or Par Value $ 4,266 [12],[22],[23]     $ 4,086 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 4,086                      
Fair Value, ending balance 4,266 [12],[23]     4,086 [15],[19]                
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                        
Principal Amount or Par Value 842 [12],[13],[22]     807 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 807                      
Fair Value, ending balance 842 [12],[13]     807 [15],[16]                
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                        
Principal Amount or Par Value 14,257 [12],[13],[22]     13,657 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 13,231                      
Fair Value, ending balance 13,733 [12],[13]     13,231 [15],[16]                
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 1                        
Principal Amount or Par Value [15],[17],[19]       18,750                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 17,079                      
Fair Value, ending balance [15],[19]       $ 17,079                
Spread [15],[19]       8.00%     8.00% 8.00%        
Investment, Identifier [Axis]: KAMC Holdings, Inc., Second lien 2                        
Principal Amount or Par Value [15],[17],[24]       $ 18,750                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 17,079                      
Fair Value, ending balance [15],[24]       $ 17,079                
Spread [15],[24]       8.00%     8.00% 8.00%        
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] 19                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 19                      
Spread [12],[13],[21] 5.75%       5.75% 5.75%            
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn 1                        
Principal Amount or Par Value [15],[17],[18],[19]       $ 1,160                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] $ 1,138                      
Fair Value, ending balance [15],[18],[19]       $ 1,138                
Spread [15],[18],[19]       5.25%     5.25% 5.25%        
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn 2                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 19                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 19                      
Fair Value, ending balance [15],[16],[18]       $ 19                
Spread [15],[16],[18]       5.75%     5.75% 5.75%        
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[18]       $ 1,568                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (16)                      
Fair Value, ending balance [15],[16],[18]       (16)                
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 1,568                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                        
Principal Amount or Par Value 6,880 [12],[22],[25]     6,898 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 6,763                      
Fair Value, ending balance $ 6,880 [12],[25]     $ 6,763 [15],[24]                
Spread 5.25% [12],[25]     5.25% [15],[24] 5.25% [12],[25] 5.25% [12],[25] 5.25% [15],[24] 5.25% [15],[24]        
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                        
Principal Amount or Par Value $ 1,158 [12],[22],[25]     $ 790 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 774                      
Fair Value, ending balance $ 1,158 [12],[25]     $ 774 [15],[19]                
Spread 5.25% [12],[25]     5.25% [15],[19] 5.25% [12],[25] 5.25% [12],[25] 5.25% [15],[19] 5.25% [15],[19]        
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 3                        
Principal Amount or Par Value [12],[22],[25] $ 788                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 788                      
Spread [12],[25] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: Kaseya Inc., First Lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 973                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 973                      
Spread [12],[13],[21] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Kaseya Inc., First Lien 1                        
Principal Amount or Par Value [12],[22],[23] $ 64,039                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 64,039                      
Spread [12],[23],[30] 3.50%       3.50% 3.50%            
Investment, Identifier [Axis]: Kaseya Inc., First Lien 2                        
Principal Amount or Par Value [12],[13],[22] $ 238                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 238                      
Spread [12],[13] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Kaseya Inc., First lien                        
Principal Amount or Par Value [15],[17],[19]       $ 63,633                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] $ 63,633                      
Fair Value, ending balance [15],[19]       $ 63,633                
Spread [15],[19],[32]       3.50%     3.50% 3.50%        
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 1                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 973                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 973                      
Fair Value, ending balance [15],[16],[18]       $ 973                
Spread [15],[16],[18]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 2                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 237                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 237                      
Fair Value, ending balance [15],[16],[18]       $ 237                
Spread [15],[16],[18],[32]       3.50%     3.50% 3.50%        
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                        
Principal Amount or Par Value 3,616 [12],[13],[21],[22]     $ 3,616 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                        
Principal Amount or Par Value 2,888 [12],[13],[21],[22]     2,888 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien                        
Principal Amount or Par Value [15],[17],[40]       14,796                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 14,796                      
Fair Value, ending balance [15],[40]       $ 14,796                
Spread [15],[40]       5.25%     5.25% 5.25%        
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] 1,219                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 1,219                      
Spread [12],[13],[21] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 1,799                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 580                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 1                        
Principal Amount or Par Value [12],[22],[39] 14,756                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39] $ 14,756                      
Spread [12],[39] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 2                        
Principal Amount or Par Value [12],[22],[39] $ 2,663                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39] $ 2,663                      
Spread [12],[39] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien                        
Principal Amount or Par Value [12],[22],[23] $ 3,527                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 3,492                      
Spread [12],[23] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 1                        
Principal Amount or Par Value [12],[13],[21],[22] $ 1,561                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value [12],[13],[21],[22] 468                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (5)                      
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc., Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[53] 18,028                      
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc.,Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[54] 17,019                      
Fair Value, ending balance [15],[16],[54]       $ 17,019                
Investment, Identifier [Axis]: Knockout Intermediate Holdings I, Preferred shares                        
Preferred equity dividend rate       11.75%                
Investment, Identifier [Axis]: MED Parentco, LP, Second lien                        
Principal Amount or Par Value [22],[25] 20,857                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [25] $ 20,857                      
Spread [25] 8.25%       8.25% 8.25%            
Investment, Identifier [Axis]: MED Parentco, LP, Second lien 1                        
Principal Amount or Par Value [15],[17],[24]       $ 20,857                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] $ 20,119                      
Fair Value, ending balance [15],[24]       $ 20,119                
Spread [15],[24]       8.25%     8.25% 8.25%        
Investment, Identifier [Axis]: MRI Software LLC, First Lien 1                        
Principal Amount or Par Value [15],[17],[40]       $ 21,655                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 21,598                      
Fair Value, ending balance [15],[40]       $ 21,598                
Spread [15],[40]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: MRI Software LLC, First Lien 2                        
Principal Amount or Par Value [15],[16],[17]       $ 7,670                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 7,650                      
Fair Value, ending balance [15],[16]       $ 7,650                
Spread [15],[16]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: MRI Software LLC, First Lien 3                        
Principal Amount or Par Value [15],[17],[19]       $ 4,568                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 4,557                      
Fair Value, ending balance [15],[19]       $ 4,557                
Spread [15],[19]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: MRI Software LLC, First Lien 4                        
Principal Amount or Par Value [15],[17],[19]       $ 3,140                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 3,132                      
Fair Value, ending balance [15],[19]       $ 3,132                
Spread [15],[19]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: MRI Software LLC, First Lien 5                        
Principal Amount or Par Value [15],[16],[17]       $ 801                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 800                      
Fair Value, ending balance [15],[16]       $ 800                
Spread [15],[16]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[18]       $ 2,002                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (5)                      
Fair Value, ending balance [15],[16],[18]       (5)                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 2,002                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                        
Principal Amount or Par Value [12],[22],[39] 21,598                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39] $ 21,598                      
Spread [12],[39] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                        
Principal Amount or Par Value [12],[13],[22] $ 7,650                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 7,650                      
Spread [12],[13] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                        
Principal Amount or Par Value [12],[22],[23] $ 4,557                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 4,557                      
Spread [12],[23] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                        
Principal Amount or Par Value [12],[22],[23] $ 3,132                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 3,132                      
Spread [12],[23] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                        
Principal Amount or Par Value [12],[13],[22] $ 799                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 799                      
Spread [12],[13] 5.50%       5.50% 5.50%            
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] $ 0                      
Fair Value, ending balance 0 [12],[13],[55]     0 [15],[16]                
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 0                      
Fair Value, ending balance 0 [12],[13],[55]     0 [15],[16]                
Investment, Identifier [Axis]: NM APP Canada Corp., Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[56] 7                      
Fair Value, ending balance 0 [12],[36],[57]     7 [15],[56]                
Investment, Identifier [Axis]: NM CLFX LP, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[56] 11,731                      
Fair Value, ending balance 11,265 [12],[57]     11,731 [15],[56]                
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],[56] 1,048                      
Fair Value, ending balance 1,100 [12],[36],[57]     1,048 [15],[56]                
Investment, Identifier [Axis]: NM NL Holdings, L.P., Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[56] 96,071                      
Fair Value, ending balance 100,832 [12],[36],[57]     96,071 [15],[56]                
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[56] 9,550                      
Fair Value, ending balance 9,650 [12],[57]     9,550 [15],[56]                
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       5,012                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 4,979                      
Fair Value, ending balance [15],[16],[18]       $ 4,979                
Spread [15],[16],[18]       6.09%     6.09% 6.09%        
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                        
Principal Amount or Par Value 19,259 [12],[22],[25]     $ 19,259 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 19,133                      
Fair Value, ending balance $ 19,259 [12],[25]     $ 19,133 [15],[24]                
Spread 6.09% [12],[25]     6.09% [15],[24] 6.09% [12],[25] 6.09% [12],[25] 6.09% [15],[24] 6.09% [15],[24]        
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                        
Principal Amount or Par Value $ 5,012 [12],[13],[22]     $ 4,913 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 4,881                      
Fair Value, ending balance $ 5,012 [12],[13]     $ 4,881 [15],[19]                
Spread 6.09% [12],[13]     6.09% [15],[19] 6.09% [12],[13] 6.09% [12],[13] 6.09% [15],[19] 6.09% [15],[19]        
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 3                        
Principal Amount or Par Value [12],[22],[23] $ 4,913                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 4,913                      
Spread [12],[23] 6.09%       6.09% 6.09%            
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] $ 140,000                      
Fair Value, ending balance 140,000 [12],[13],[36]     $ 140,000 [15],[16]                
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC, Membership interest                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 112,400                      
Fair Value, ending balance 112,400 [12],[13],[36]     112,400 [15],[16]                
Investment, Identifier [Axis]: National HME, Inc., Second lien                        
Principal Amount or Par Value 8,281 [12],[13],[22]     8,281 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 3,000                      
Fair Value, ending balance $ 3,000 [12],[13]     $ 3,000 [15],[16]                
Investment, Identifier [Axis]: National HME, Inc., Second lien, Tranche A Term Loan                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Investment, percentage of interest entitled to receive 20.00%     20.00% 20.00% 20.00% 20.00% 20.00%        
Spread 5.00%     5.00% 5.00% 5.00% 5.00% 5.00%        
Investment, Identifier [Axis]: National HME, Inc., Second lien, Tranche B Term Loan                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Investment, percentage of interest entitled to receive 20.00%     20.00% 20.00% 20.00% 20.00% 20.00%        
Spread 6.00%     6.00% 6.00% 6.00% 6.00% 6.00%        
Investment, Identifier [Axis]: Ncontracts, LLC, First lien                        
Principal Amount or Par Value $ 8,372 [12],[22],[23]     $ 8,372 [17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [19] 8,267                      
Fair Value, ending balance $ 8,267 [12],[23]     $ 8,267 [19]                
Spread 6.50% [12],[23]     6.50% [19] 6.50% [12],[23] 6.50% [12],[23] 6.50% [19] 6.50% [19]        
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 77                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 76                      
Spread [12],[13],[21] 6.50%       6.50% 6.50%            
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value $ 696 [12],[13],[21],[22]     $ 773 [16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16],[18] 0                      
Fair Value, ending balance (9) [12],[13],[21]     0 [16],[18]                
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value 773 [12],[13],[21],[22]     773 [16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16],[18] (10)                      
Fair Value, ending balance (10) [12],[13],[21]     (10) [16],[18]                
Investment, Identifier [Axis]: Nelipak Holding Company First lien 1                        
Principal Amount or Par Value 17,964                      
Investment, Identifier [Axis]: Nelipak Holding Company First lien 2                        
Principal Amount or Par Value 6,917                      
Investment, Identifier [Axis]: Nelipak Holding Company First lien 3                        
Principal Amount or Par Value 1,290                      
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 1                        
Principal Amount or Par Value [13],[21],[22] 3,501       € 6,411 [58]              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [13],[21] 0 € 0 [58]                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 2                        
Principal Amount or Par Value | € [13],[21],[22],[58]         1,196              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance | € [13],[21],[58]   € (9)                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 4                        
Principal Amount or Par Value [13],[21],[22] 2,613                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [13],[21] (20)                      
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 1                        
Principal Amount or Par Value | € [13],[22],[58]         € 16,648              
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [13],[58] $ 17,829                      
Spread [13],[58] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 2                        
Principal Amount or Par Value [22],[23] $ 9,092                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [23] $ 9,023                      
Spread [23] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                        
Principal Amount or Par Value $ 42,812 [12],[22],[23]     41,731 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 41,731                      
Fair Value, ending balance 42,812 [12],[23]     41,731 [15],[19]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                        
Principal Amount or Par Value 20,393 [12],[13],[22]     19,798 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 19,798                      
Fair Value, ending balance 20,393 [12],[13]     19,798 [15],[16]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                        
Principal Amount or Par Value 10,504 [12],[22],[25]     10,239 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 10,239                      
Fair Value, ending balance 10,504 [12],[25]     10,239 [15],[24]                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                        
Principal Amount or Par Value 21,738 [12],[13],[22]     21,092 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 16,874                      
Fair Value, ending balance 17,391 [12],[13]     16,874 [15],[16]                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 31,838                      
Fair Value, ending balance 28,232 [12],[23]     31,838 [15],[19]                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 7,812                      
Fair Value, ending balance 6,927 [12],[25]     7,812 [15],[24]                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 3                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 7,109                      
Fair Value, ending balance 6,304 [12],[13]     7,109 [15],[16]                
Investment, Identifier [Axis]: New Permian Holdco, Inc., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 26,000                      
Fair Value, ending balance 26,000 [12],[13]     26,000 [15],[16]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                        
Principal Amount or Par Value 23,336 [12],[13],[22]     23,336 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 23,335                      
Fair Value, ending balance 23,336 [12],[13]     23,335 [15],[16]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                        
Principal Amount or Par Value 15,905 [12],[13],[21],[22]     13,835 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 13,835                      
Fair Value, ending balance 15,905 [12],[13],[21]     13,835 [15],[16],[18]                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                        
Principal Amount or Par Value 5,989 [12],[13],[21],[22]     8,060 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien                        
Principal Amount or Par Value [15],[17],[19]       26,762                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 1,421                      
Fair Value, ending balance [15],[19]       $ 1,421                
Spread [15],[19]       7.25%     7.25% 7.25%        
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien 1                        
Principal Amount or Par Value [22],[23] 26,762                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [23] 335                      
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien 2                        
Principal Amount or Par Value [13],[22] 9,162                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [13] 115                      
Investment, Identifier [Axis]: New Trojan Parent, Inc., Second lien term loan                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance 450                      
Investment, Identifier [Axis]: Next Holdco, LLC, First lien                        
Principal Amount or Par Value 3,520 [12],[22],[23]     $ 3,520 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 3,494                      
Fair Value, ending balance $ 3,494 [12],[23]     $ 3,494 [15],[19]                
Spread 6.00% [12],[23]     6.00% [15],[19] 6.00% [12],[23] 6.00% [12],[23] 6.00% [15],[19] 6.00% [15],[19]        
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value $ 903 [12],[13],[21]     $ 903 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value 339 [12],[13],[21]     339 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (3)                      
Fair Value, ending balance (3) [12],[13],[21]     (3) [15],[16],[18]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] 293                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 272                      
Spread [12],[13],[21] 6.75%       6.75% 6.75%            
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 1                        
Principal Amount or Par Value [15],[16],[17],[18]       867                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 803                      
Fair Value, ending balance [15],[16],[18]       $ 803                
Spread [15],[16],[18]       6.75%     6.75% 6.75%        
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn 2                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 59                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 55                      
Fair Value, ending balance [15],[16],[18]       $ 55                
Spread [15],[16],[18]       6.75%     6.75% 6.75%        
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn                        
Principal Amount or Par Value 587 [12],[13],[21],[22]     $ 822 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (61)                      
Fair Value, ending balance (42) [12],[13],[21]     (61) [15],[16],[18]                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                        
Principal Amount or Par Value 9,924 [12],[22],[25]     9,950 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 9,215                      
Fair Value, ending balance $ 9,207 [12],[25]     $ 9,215 [15],[24]                
Spread 6.75% [12],[25]     6.75% [15],[24] 6.75% [12],[25] 6.75% [12],[25] 6.75% [15],[24] 6.75% [15],[24]        
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                        
Principal Amount or Par Value $ 9,800 [12],[22],[25]     $ 9,825 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 9,100                      
Fair Value, ending balance $ 9,091 [12],[25]     $ 9,100 [15],[24]                
Spread 6.75% [12],[25]     6.75% [15],[24] 6.75% [12],[25] 6.75% [12],[25] 6.75% [15],[24] 6.75% [15],[24]        
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 3                        
Principal Amount or Par Value [12],[13],[22] $ 865                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 802                      
Spread [12],[13] 6.75%       6.75% 6.75%            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien                        
Number of investments held | investment 2       2 2            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 480                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 480                      
Spread [12],[13],[21] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                        
Principal Amount or Par Value $ 3,120 [12],[13],[21],[59]     $ 3,600 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21],[59]     0 [15],[16],[18]                
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                        
Principal Amount or Par Value 27,637 [12],[22],[23]     27,707 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 27,707                      
Fair Value, ending balance $ 27,637 [12],[23]     $ 27,707 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                        
Principal Amount or Par Value $ 1,749 [12],[22],[23]     $ 1,754 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 1,754                      
Fair Value, ending balance $ 1,749 [12],[23]     $ 1,754 [15],[19]                
Spread 5.50% [12],[23]     5.50% [15],[19] 5.50% [12],[23] 5.50% [12],[23] 5.50% [15],[19] 5.50% [15],[19]        
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],[60] $ 3,343                      
Fair Value, ending balance 3,620 [12],[13],[59]     $ 3,343 [15],[16],[60]                
Investment, Identifier [Axis]: OEC Holdco, LLC, Preferred shares                        
Preferred equity dividend rate       11.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[61],[62] 8,115                      
Fair Value, ending balance [15],[61],[62]       $ 8,115                
Investment, Identifier [Axis]: OEC Holdco, LLC, Preferred shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [63],[64] $ 8,978                      
Investment, Identifier [Axis]: OEConnection LLC, Second lien                        
Number of investments held | investment 2     2 2 2 2 2        
Investment, Identifier [Axis]: OEConnection LLC, Second lien 1                        
Principal Amount or Par Value $ 23,406 [22],[23]     $ 23,406 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 23,406                      
Fair Value, ending balance $ 23,406 [23]     $ 23,406 [15],[19]                
Spread 7.00% [23]     7.00% [15],[19] 7.00% [23] 7.00% [23] 7.00% [15],[19] 7.00% [15],[19]        
Investment, Identifier [Axis]: OEConnection LLC, Second lien 2                        
Principal Amount or Par Value $ 12,044 [22],[23]     $ 12,044 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 12,044                      
Fair Value, ending balance $ 12,044 [23]     $ 12,044 [15],[19]                
Spread 7.00% [23]     7.00% [15],[19] 7.00% [23] 7.00% [23] 7.00% [15],[19] 7.00% [15],[19]        
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                        
Principal Amount or Par Value $ 1,860 [12],[13],[21],[22]     $ 1,860 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 1                        
Principal Amount or Par Value 7,440 [12],[22],[25]     7,440 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 7,440                      
Fair Value, ending balance $ 7,440 [12],[25]     $ 7,440 [15],[24]                
Spread 7.50% [12],[25]     7.50% [15],[24] 7.50% [12],[25] 7.50% [12],[25] 7.50% [15],[24] 7.50% [15],[24]        
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 2                        
Principal Amount or Par Value $ 7,440 [12],[22],[23]     $ 7,440 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 7,440                      
Fair Value, ending balance $ 7,440 [12],[23]     $ 7,440 [15],[19]                
Spread 7.50% [12],[23]     7.50% [15],[19] 7.50% [12],[23] 7.50% [12],[23] 7.50% [15],[19] 7.50% [15],[19]        
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien                        
Principal Amount or Par Value [12],[22],[26] $ 16,300                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[26] $ 16,219                      
Spread [12],[26] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 1                        
Principal Amount or Par Value [12],[21],[22],[26] $ 6,177                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[21],[26] 0                      
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value [12],[13],[21],[22] 1,830                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (9)                      
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien                        
Principal Amount or Par Value 7,514 [12],[22],[26]     $ 7,514 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 7,514                      
Fair Value, ending balance $ 7,514 [12],[26]     $ 7,514 [15],[20]                
Spread 5.75% [12],[26]     5.75% [15],[20] 5.75% [12],[26] 5.75% [12],[26] 5.75% [15],[20] 5.75% [15],[20]        
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 486                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 486                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                        
Principal Amount or Par Value 14,500 [12],[13],[22]                     $ 20,000
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance 7,975                      
Fair Value, ending balance 7,975 [12],[13]     7,975                
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                        
Principal Amount or Par Value [15],[16],[17]       14,500                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 7,975                      
Fair Value, ending balance [15],[16]       $ 7,975                
Spread [15],[16]       0.00%     0.00% 0.00%        
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                        
Principal Amount or Par Value 0 [22],[29],[65]     $ 0 [17],[31],[66]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [31],[66] 0                      
Fair Value, ending balance $ 0 [29],[65]     $ 0 [31],[66]                
Spread 0.00% [29],[65]     0.00% [31],[66] 0.00% [29],[65] 0.00% [29],[65] 0.00% [31],[66] 0.00% [31],[66]        
Investment, Identifier [Axis]: Permian Trust, First lien 1                        
Principal Amount or Par Value $ 247 [12],[22],[67]     $ 247 [15],[17],[68]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[68] 0                      
Fair Value, ending balance 0 [12],[67]     0 [15],[68]                
Investment, Identifier [Axis]: Permian Trust, First lien 2                        
Principal Amount or Par Value 3,409 [12],[13],[22]     3,409 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 0                      
Fair Value, ending balance 0 [12],[13]     0 [15],[16]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien                        
Principal Amount or Par Value [17],[19]       28,430                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [19] 28,439                      
Fair Value, ending balance [19]       $ 28,439                
Spread [19]       6.00%     6.00% 6.00%        
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21] 3,708                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value [16],[17],[18]       $ 3,708                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16],[18] 1                      
Fair Value, ending balance [16],[18]       1                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value 3,708 [12],[13],[21]     3,708 [16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [16],[18]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien 1                        
Principal Amount or Par Value [12],[22],[23] 28,359                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 28,359                      
Spread [12],[23] 6.00%       6.00% 6.00%            
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien                        
Number of investments held | investment 2       2 2            
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                        
Principal Amount or Par Value $ 3,284 [12],[13],[21],[22],[69]     2,446 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21],[69]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                        
Principal Amount or Par Value 17,321 [12],[22],[25]     16,802 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 16,802                      
Fair Value, ending balance 17,321 [12],[25]     16,802 [15],[24]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                        
Principal Amount or Par Value 5,768 [12],[13],[22]     2,303 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 2,303                      
Fair Value, ending balance 5,768 [12],[13]     2,303 [15],[24]                
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 3                        
Principal Amount or Par Value [12],[22],[25] 2,374                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] 2,374                      
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 [70] 1,796                      
Fair Value, ending balance [70]       1,796                
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Ordinary shares                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[69] 1,959                      
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien                        
Principal Amount or Par Value [15],[17],[20]       18,193                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 18,011                      
Fair Value, ending balance [15],[20]       $ 18,011                
Spread [15],[20]       4.75%     4.75% 4.75%        
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien                        
Principal Amount or Par Value [12],[22],[26] 18,193                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[26] $ 18,011                      
Spread [12],[26] 4.75%       4.75% 4.75%            
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 214                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 212                      
Fair Value, ending balance [15],[16],[18]       $ 212                
Spread [15],[16],[18]       4.75%     4.75% 4.75%        
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Drawn                        
Principal Amount or Par Value [12],[13],[21],[22] 107                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] $ 106                      
Spread [12],[13],[21] 4.75%       4.75% 4.75%            
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Undrawn                        
Principal Amount or Par Value $ 4,182 [12],[13],[21],[22]     $ 4,075 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (41)                      
Fair Value, ending balance (42) [12],[13],[21]     (41) [15],[16],[18]                
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien                        
Principal Amount or Par Value [12],[22],[39] 10,572                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39] $ 10,518                      
Spread [12],[39] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] $ 1,510                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] (8)                      
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] 12,382                      
Fair Value, ending balance 12,480 [12],[13]     12,382 [15],[16]                
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien                        
Principal Amount or Par Value 3,544 [12],[22],[23]     3,553 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 3,553                      
Fair Value, ending balance $ 3,544 [12],[23]     $ 3,553 [15],[19]                
Spread 7.00% [12],[23]     7.00% [15],[19] 7.00% [12],[23] 7.00% [12],[23] 7.00% [15],[19] 7.00% [15],[19]        
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 184                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 184                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien                        
Principal Amount or Par Value 5,096 [12],[22],[25]     5,109 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 5,109                      
Fair Value, ending balance $ 5,096 [12],[25]     $ 5,109 [15],[19]                
Spread 5.50% [12],[25]     5.50% [15],[19] 5.50% [12],[25] 5.50% [12],[25] 5.50% [15],[19] 5.50% [15],[19]        
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 1,161                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 1,161                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Quartz Holding Company, Second lien                        
Principal Amount or Par Value [15],[16],[17]       10,000                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 10,000                      
Fair Value, ending balance [15],[16]       $ 10,000                
Spread [15],[16]       8.00%     8.00% 8.00%        
Investment, Identifier [Axis]: RealPage, Inc., First lien                        
Principal Amount or Par Value [22],[23] 41,887                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [23] $ 41,676                      
Spread [23] 6.50%       6.50% 6.50%            
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 2,981                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 2,981                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 1                        
Principal Amount or Par Value 24,158 [12],[22],[25]     24,220 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 24,220                      
Fair Value, ending balance $ 24,158 [12],[25]     $ 24,220 [15],[24]                
Spread 5.25% [12],[25]     5.25% [15],[24] 5.25% [12],[25] 5.25% [12],[25] 5.25% [15],[24] 5.25% [15],[24]        
Investment, Identifier [Axis]: Recorded Future, Inc., First lien 2                        
Principal Amount or Par Value $ 12,492 [12],[22],[23]     $ 12,524 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 12,524                      
Fair Value, ending balance $ 12,492 [12],[23]     $ 12,524 [15],[19]                
Spread 5.25% [12],[23]     5.25% [15],[19] 5.25% [12],[23] 5.25% [12],[23] 5.25% [15],[19] 5.25% [15],[19]        
Investment, Identifier [Axis]: Riskonnect Parent, LLC, First lien - Undrawn                        
Principal Amount or Par Value [22] $ 6,349                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance 0                      
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien                        
Principal Amount or Par Value [15],[17],[19]       $ 6,904                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 6,904                      
Fair Value, ending balance [15],[19]       $ 6,904                
Spread [15],[19]       5.25%     5.25% 5.25%        
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                        
Principal Amount or Par Value 77 [12],[13],[21],[22]     $ 384 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 384                      
Fair Value, ending balance $ 77 [12],[13],[21]     $ 384 [15],[16],[18]                
Spread 4.25% [12],[13],[21]     4.25% [15],[16],[18] 4.25% [12],[13],[21] 4.25% [12],[13],[21] 4.25% [15],[16],[18] 4.25% [15],[16],[18]        
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 128                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 435                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 1                        
Principal Amount or Par Value [12],[22],[23] 7,523                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 7,523                      
Spread [12],[23] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 2                        
Principal Amount or Par Value [12],[22],[25] $ 1,538                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 1,538                      
Spread [12],[25] 5.25%       5.25% 5.25%            
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien                        
Principal Amount or Par Value [16],[17]       23,780                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16] $ 22,055                      
Fair Value, ending balance [16]       $ 22,055                
Spread [16],[32]       2.50%     2.50% 2.50%        
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien 1                        
Principal Amount or Par Value [12],[13],[22] 27,954                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 27,608                      
Spread [12],[13],[30] 2.50%       2.50% 2.50%            
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],[16] $ 1,799                      
Fair Value, ending balance 1,799 [12],[23]     $ 1,799 [15],[16]                
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 [12],[13]     201 [15],[16]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn                        
Principal Amount or Par Value 101 [12],[13],[21],[22]     78 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 76                      
Fair Value, ending balance $ 96 [12],[13],[21]     $ 76 [15],[16],[18]                
Spread 4.00% [12],[13],[21]     4.00% [15],[16],[18] 4.00% [12],[13],[21] 4.00% [12],[13],[21] 4.00% [15],[16],[18] 4.00% [15],[16],[18]        
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn                        
Principal Amount or Par Value $ 458 [12],[13],[21],[22]     $ 481 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (17)                      
Fair Value, ending balance (17) [12],[13],[21]     (17) [15],[16],[18]                
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 1                        
Principal Amount or Par Value 10,326 [12],[22],[23]     10,352 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 9,938                      
Fair Value, ending balance $ 9,949 [12],[23]     $ 9,938 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 2                        
Principal Amount or Par Value $ 78 [12],[13],[22]     $ 78 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 76                      
Fair Value, ending balance $ 75 [12],[13]     $ 76 [15],[16]                
Spread 5.75% [12],[13]     5.75% [15],[16] 5.75% [12],[13] 5.75% [12],[13] 5.75% [15],[16] 5.75% [15],[16]        
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Drawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 112                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 110                      
Fair Value, ending balance [15],[16],[18]       $ 110                
Spread [15],[16],[18]       5.75%     5.75% 5.75%        
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[18]       $ 447                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (8)                      
Fair Value, ending balance [15],[16],[18]       (8)                
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 559                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien 1                        
Principal Amount or Par Value 3,935 [12],[22],[23]     3,945 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 3,878                      
Fair Value, ending balance $ 3,935 [12],[23]     $ 3,878 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien 2                        
Principal Amount or Par Value $ 2,781 [12],[22],[23]     $ 2,788 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 2,740                      
Fair Value, ending balance $ 2,781 [12],[23]     $ 2,740 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc. , Preferred shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] $ 13,807                      
Fair Value, ending balance [15],[20]       $ 13,807                
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] 4,759                      
Fair Value, ending balance [15],[16]       4,759                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 1                        
Principal Amount or Par Value [12],[22],[26] 7,500                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[26] 14,110                      
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 2                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] 4,864                      
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                        
Principal Amount or Par Value 22,500 [12],[22],[26]     22,500 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 22,500                      
Fair Value, ending balance $ 22,500 [12],[26]     $ 22,500 [15],[20]                
Spread 8.00% [12],[26]     8.00% [15],[20] 8.00% [12],[26] 8.00% [12],[26] 8.00% [15],[20] 8.00% [15],[20]        
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                        
Principal Amount or Par Value $ 5,697 [12],[22],[23]     $ 5,697 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 5,697                      
Fair Value, ending balance $ 5,697 [12],[23]     $ 5,697 [15],[19]                
Spread 8.00% [12],[23]     8.00% [15],[19] 8.00% [12],[23] 8.00% [12],[23] 8.00% [15],[19] 8.00% [15],[19]        
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                        
Principal Amount or Par Value $ 10,604 [12],[22],[23]     $ 16,227 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 9,736                      
Fair Value, ending balance 9,649 [12],[23]     $ 9,736 [15],[19]                
Spread [15],[19]       3.50%     3.50% 3.50%        
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                        
Principal Amount or Par Value 9,144 [12],[22],[25]     $ 15,651 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 9,392                      
Fair Value, ending balance 8,321 [12],[25]     $ 9,392 [15],[24]                
Spread [15],[24]       3.50%     3.50% 3.50%        
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 3                        
Principal Amount or Par Value 1,684 [13],[22]     $ 1,033 [17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [19] 1,033                      
Fair Value, ending balance $ 1,338 [13]     $ 1,033 [19]                
Spread 1.00% [13],[30]     9.50% [19] 1.00% [13],[30] 1.00% [13],[30] 9.50% [19] 9.50% [19]        
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 4                        
Principal Amount or Par Value [17],[24]       $ 996                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [24] $ 996                      
Fair Value, ending balance [24]       $ 996                
Spread [24]       9.50%     9.50% 9.50%        
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 1                        
Principal Amount or Par Value [12],[22],[23] 279                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] 279                      
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 2                        
Principal Amount or Par Value [12],[22],[25] 269                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] 269                      
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC), Second lien                        
Principal Amount or Par Value [15],[17],[19]       $ 7,950                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 7,711                      
Fair Value, ending balance [15],[19]       $ 7,711                
Spread [15],[19]       6.75%     6.75% 6.75%        
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC), Second lien 1                        
Principal Amount or Par Value [12],[22],[25] 7,950                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 7,887                      
Spread [12],[25] 6.75%       6.75% 6.75%            
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                        
Ordinary shares dividend rate       12.00%                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] $ 95,151                      
Fair Value, ending balance 72,414 [12],[13],[43]     $ 95,151 [15],[16]                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien                        
Principal Amount or Par Value       16,600                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                        
Principal Amount or Par Value 16,669         £ 13,205 [12],[13],[22],[58]   £ 13,039 [15],[16],[17],[71]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[71] 16,600                      
Fair Value, ending balance $ 16,668 [12],[13],[58]     $ 16,600 [15],[16],[71]                
Spread 5.00% [12],[13],[30],[58]     5.00% [15],[16],[32],[71] 5.00% [12],[13],[30],[58] 5.00% [12],[13],[30],[58] 5.00% [15],[16],[32],[71] 5.00% [15],[16],[32],[71]        
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                        
Principal Amount or Par Value | £           £ 10,803 [12],[13],[22],[58]   £ 10,734 [15],[16],[17],[71]        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[71] $ 13,664                      
Fair Value, ending balance $ 13,635 [12],[13],[58]     $ 13,664 [15],[16],[71]                
Spread 5.00% [12],[13],[30],[58]     5.00% [15],[16],[32],[71] 5.00% [12],[13],[30],[58] 5.00% [12],[13],[30],[58] 5.00% [15],[16],[32],[71] 5.00% [15],[16],[32],[71]        
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2 and Tennessee Bidco Limited, First lien 5                        
Principal Amount or Par Value $ 14,421     $ 14,457                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                        
Principal Amount or Par Value 10,446 [12],[13],[22]     10,312 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 10,312                      
Fair Value, ending balance $ 10,446 [12],[13]     $ 10,312 [15],[16]                
Spread 5.00% [12],[13],[30]     5.00% [15],[16],[32] 5.00% [12],[13],[30] 5.00% [12],[13],[30] 5.00% [15],[16],[32] 5.00% [15],[16],[32]        
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                        
Principal Amount or Par Value $ 6,406 [12],[13],[22]     $ 6,373 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 6,373                      
Fair Value, ending balance $ 6,406 [12],[13]     $ 6,373 [15],[16]                
Spread 5.00% [12],[13],[30]     5.00% [15],[16],[32] 5.00% [12],[13],[30] 5.00% [12],[13],[30] 5.00% [15],[16],[32] 5.00% [15],[16],[32]        
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                        
Principal Amount or Par Value | €         € 726 [12],[13],[22],[58]   € 716 [15],[16],[17],[71]          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[71] $ 791                      
Fair Value, ending balance $ 783 [12],[13],[58]     $ 791 [15],[16],[71]                
Spread 5.00% [12],[13],[30],[58]     5.00% [15],[16],[32],[71] 5.00% [12],[13],[30],[58] 5.00% [12],[13],[30],[58] 5.00% [15],[16],[32],[71] 5.00% [15],[16],[32],[71]        
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                        
Principal Amount or Par Value $ 29,868 [12],[22],[23]     $ 29,868 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 29,614                      
Fair Value, ending balance $ 29,868 [12],[23]     $ 29,614 [15],[24]                
Spread 3.38% [12],[23],[30]     3.38% [15],[24],[32] 3.38% [12],[23],[30] 3.38% [12],[23],[30] 3.38% [15],[24],[32] 3.38% [15],[24],[32]        
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                        
Principal Amount or Par Value $ 1,624 [12],[21],[22],[23]     $ 1,354 [15],[17],[18],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] 1,343                      
Fair Value, ending balance $ 1,624 [12],[21],[23]     $ 1,343 [15],[18],[19]                
Spread 3.38% [12],[21],[23],[30]     3.38% [15],[18],[19],[32] 3.38% [12],[21],[23],[30] 3.38% [12],[21],[23],[30] 3.38% [15],[18],[19],[32] 3.38% [15],[18],[19],[32]        
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[21],[23] $ 615                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[21],[23] 0                      
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                        
Principal Amount or Par Value [15],[18],[19]       $ 885                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] (8)                      
Fair Value, ending balance [15],[18],[19]       (8)                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value 4,267 [12],[13],[21]     4,267 [15],[16],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] (36)                      
Fair Value, ending balance 0 [12],[13],[21]     (36) [15],[16],[18]                
Investment, Identifier [Axis]: Transcendia Holdings, Inc. Second lien term loan                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance 5,610                      
Investment, Identifier [Axis]: Transcendia Holdings, Inc., Second lien                        
Principal Amount or Par Value 14,500 [12],[22],[25]     14,500 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 7,250                      
Fair Value, ending balance 5,610 [12],[25]     $ 7,250 [15],[24]                
Spread [15],[24]       8.00%     8.00% 8.00%        
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien                        
Principal Amount or Par Value 15,382 [12],[22],[23]     $ 15,382 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 15,382                      
Fair Value, ending balance $ 15,382 [12],[23]     $ 15,382 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                        
Principal Amount or Par Value [15],[17],[18],[19]       $ 4,070                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] $ 4,070                      
Fair Value, ending balance [15],[18],[19]       $ 4,070                
Spread [15],[18],[19]       5.75%     5.75% 5.75%        
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Drawn                        
Principal Amount or Par Value [12],[21],[22],[23] 4,295                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[21],[23] $ 4,295                      
Spread [12],[21],[23] 5.75%       5.75% 5.75%            
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                        
Principal Amount or Par Value $ 958 [12],[21],[22],[23]     $ 1,182 [15],[17],[18],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] 0                      
Fair Value, ending balance 0 [12],[21],[23]     0 [15],[18],[19]                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                        
Principal Amount or Par Value 1,501 [12],[13],[21],[22]     1,501 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       893                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 893                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                        
Principal Amount or Par Value 5,599 [12],[22],[23]     11,226 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 11,226                      
Fair Value, ending balance $ 5,599 [12],[23]     $ 11,226 [15],[19]                
Spread 5.75% [12],[23]     5.75% [15],[19] 5.75% [12],[23] 5.75% [12],[23] 5.75% [15],[19] 5.75% [15],[19]        
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                        
Principal Amount or Par Value $ 5,599 [12],[22],[25]     $ 1,462 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 1,462                      
Fair Value, ending balance $ 5,599 [12],[25]     $ 1,462 [15],[16]                
Spread 5.75% [12],[25]     5.75% [15],[16] 5.75% [12],[25] 5.75% [12],[25] 5.75% [15],[16] 5.75% [15],[16]        
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 3                        
Principal Amount or Par Value [12],[13],[22] $ 1,458                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13] $ 1,457                      
Spread [12],[13] 5.75%       5.75% 5.75%            
Investment, Identifier [Axis]: UniTek Global Services, Inc., Junior preferred shares, Non-accrual status                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance $ 0                      
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 1                        
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 0                      
Fair Value, ending balance 0 [12],[23]     $ 0 [15],[16]                
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 [12],[13]     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] 16,348                      
Fair Value, ending balance 18,170 [12],[13]     16,348 [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] 10,119                      
Fair Value, ending balance 11,038 [12],[13]     10,119 [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],[31] 4,210                      
Fair Value, ending balance 3,298 [12],[13]     4,210 [15],[16],[31]                
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],[16],[31] 0                      
Fair Value, ending balance 0 [12],[23]     0 [15],[16],[31]                
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],[31] 0                      
Fair Value, ending balance 0 [12],[13]     0 [15],[16],[31]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                        
Principal Amount or Par Value [15],[16],[17]       13,438                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 12,893                      
Fair Value, ending balance 13,720 [12],[13]     12,893 [15],[16]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                        
Principal Amount or Par Value [15],[16],[17]       5,957                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 5,713                      
Fair Value, ending balance 6,082 [12],[13]     5,713 [15],[16]                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Senior preferred shares, Non-accrual status                        
Principal Amount or Par Value                   $ 19,795    
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance 3,298                      
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] 42,716                      
Fair Value, ending balance 45,326 [12],[13]     42,716 [15],[16]                
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                        
Principal Amount or Par Value [13],[22] 11,001                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [13] $ 9,888                      
Spread [13] 7.13%       7.13% 7.13%            
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                        
Principal Amount or Par Value [16],[17]       9,401                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [16] $ 8,077                      
Fair Value, ending balance [16]       $ 8,077                
Spread [16]       7.13%     7.13% 7.13%        
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien - Drawn                        
Principal Amount or Par Value [12],[21],[22],[23] 15,019                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[21],[23] $ 15,018                      
Spread [12],[21],[23] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 1                        
Principal Amount or Par Value [12],[22],[25] $ 12,000                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 12,000                      
Spread [12],[25] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 2                        
Principal Amount or Par Value [12],[22],[23] $ 6,711                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[23] $ 6,711                      
Spread [12],[23] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 3                        
Principal Amount or Par Value [12],[22],[25] $ 1,238                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 1,238                      
Spread [12],[25] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 4                        
Principal Amount or Par Value [12],[22],[25] $ 830                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[25] $ 830                      
Spread [12],[25] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Drawn                        
Principal Amount or Par Value [15],[17],[18],[19]       $ 13,336                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] $ 13,336                      
Fair Value, ending balance [15],[18],[19]       $ 13,336                
Spread [15],[18],[19]       5.75%     5.75% 5.75%        
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                        
Principal Amount or Par Value 684 [12],[21],[22],[23]     $ 2,396 [15],[17],[18],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] 0                      
Fair Value, ending balance 0 [12],[21],[23]     0 [15],[18],[19]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                        
Principal Amount or Par Value 2,040 [12],[13],[21],[22]     2,040 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                        
Principal Amount or Par Value [15],[17],[19]       18,758                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 18,758                      
Fair Value, ending balance [15],[19]       $ 18,758                
Spread [15],[19]       5.75%     5.75% 5.75%        
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                        
Principal Amount or Par Value [15],[17],[19]       $ 1,241                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 1,241                      
Fair Value, ending balance [15],[19]       $ 1,241                
Spread [15],[19]       5.75%     5.75% 5.75%        
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                        
Principal Amount or Par Value [15],[17],[19]       $ 832                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 832                      
Fair Value, ending balance [15],[19]       $ 832                
Spread [15],[19]       5.75%     5.75% 5.75%        
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subordinated                        
Principal Amount or Par Value 3,647 [12],[13],[22]     $ 3,513 [15],[16],[17]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16] 3,459                      
Fair Value, ending balance 3,647 [12],[13]     3,459 [15],[16]                
Investment, Identifier [Axis]: Xactly Corporation, First lien                        
Principal Amount or Par Value 22,500 [12],[22],[26]     22,500 [15],[17],[20]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[20] 22,500                      
Fair Value, ending balance $ 22,500 [12],[26]     $ 22,500 [15],[20]                
Spread 7.25% [12],[26]     7.25% [15],[20] 7.25% [12],[26] 7.25% [12],[26] 7.25% [15],[20] 7.25% [15],[20]        
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                        
Principal Amount or Par Value [15],[16],[17],[18]       $ 992                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] $ 0                      
Fair Value, ending balance [15],[16],[18]       0                
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                        
Principal Amount or Par Value [12],[13],[21],[22] 992                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[13],[21] 0                      
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn                        
Principal Amount or Par Value [12],[21],[22],[39] 80                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[21],[39] $ 80                      
Spread [12],[21],[39] 5.50%       5.50% 5.50%            
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 1                        
Principal Amount or Par Value [15],[17],[18],[40]       1,204                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[40] $ 1,204                      
Fair Value, ending balance [15],[18],[40]       $ 1,204                
Spread [15],[18],[40]       5.00%     5.00% 5.00%        
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Drawn 2                        
Principal Amount or Par Value [15],[17],[18],[40]       $ 80                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[40] 80                      
Fair Value, ending balance [15],[18],[40]       $ 80                
Spread [15],[18],[40]       5.50%     5.50% 5.50%        
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                        
Principal Amount or Par Value 785 [12],[21],[22],[39]     $ 785 [15],[17],[18],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[40] 0                      
Fair Value, ending balance 0 [12],[21],[39]     0 [15],[18],[40]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value 3,968 [12],[13],[21],[22]     3,968 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance 0 [12],[13],[21]     0 [15],[16],[18]                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 1                        
Principal Amount or Par Value 17,631 [12],[22],[39]     17,677 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 17,676                      
Fair Value, ending balance $ 17,631 [12],[39]     $ 17,676 [15],[40]                
Spread 5.00% [12],[39]     5.00% [15],[40] 5.00% [12],[39] 5.00% [12],[39] 5.00% [15],[40] 5.00% [15],[40]        
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 2                        
Principal Amount or Par Value $ 2,296 [12],[22],[39]     $ 2,302 [15],[17],[40]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[40] 2,301                      
Fair Value, ending balance $ 2,296 [12],[39]     $ 2,301 [15],[40]                
Spread 5.00% [12],[39]     5.00% [15],[40] 5.00% [12],[39] 5.00% [12],[39] 5.00% [15],[40] 5.00% [15],[40]        
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien 3                        
Principal Amount or Par Value [12],[22],[39] $ 1,201                      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, ending balance [12],[39] $ 1,201                      
Spread [12],[39] 5.00%       5.00% 5.00%            
Investment, Identifier [Axis]: iCIMS, Inc., First Lien - Drawn                        
Principal Amount or Par Value $ 265 [12],[13],[21],[22]     $ 471 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 471                      
Fair Value, ending balance $ 265 [12],[13],[21]     $ 471 [15],[16],[18]                
Spread 6.75% [12],[13],[21]     6.75% [15],[16],[18] 6.75% [12],[13],[21] 6.75% [12],[13],[21] 6.75% [15],[16],[18] 6.75% [15],[16],[18]        
Investment, Identifier [Axis]: iCIMS, Inc., First Lien 1                        
Principal Amount or Par Value $ 43,695 [12],[22],[23]     $ 30,783 [15],[17],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[24] 31,008                      
Fair Value, ending balance $ 44,132 [12],[23]     $ 31,008 [15],[24]                
Spread 3.38% [12],[23],[30]     3.88% [15],[24],[32] 3.38% [12],[23],[30] 3.38% [12],[23],[30] 3.88% [15],[24],[32] 3.88% [15],[24],[32]        
Investment, Identifier [Axis]: iCIMS, Inc., First Lien 2                        
Principal Amount or Par Value $ 7,366 [12],[22],[23]     $ 7,366 [15],[17],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] 7,440                      
Fair Value, ending balance $ 7,440 [12],[23]     $ 7,440 [15],[19]                
Spread 7.25% [12],[23]     7.25% [15],[19] 7.25% [12],[23] 7.25% [12],[23] 7.25% [15],[19] 7.25% [15],[19]        
Investment, Identifier [Axis]: iCIMS, Inc., First Lien 3                        
Principal Amount or Par Value [15],[17],[19]       $ 4,772                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[19] $ 4,807                      
Fair Value, ending balance [15],[19]       $ 4,807                
Spread [15],[19],[32]       3.38%     3.38% 3.38%        
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                        
Principal Amount or Par Value 5,989 [12],[21],[25]     $ 6,293 [15],[17],[18],[24]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[24] 0                      
Fair Value, ending balance 0 [12],[21],[25]     0 [15],[18],[24]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                        
Principal Amount or Par Value 2,429 [12],[21],[23]     976 [15],[17],[18],[19]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[18],[19] 0                      
Fair Value, ending balance 0 [12],[21],[23]     0 [15],[18],[19]                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 3                        
Principal Amount or Par Value 3,265 [12],[13],[21]     2,347 [15],[16],[17],[18]                
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]                        
Fair Value, beginning balance [15],[16],[18] 0                      
Fair Value, ending balance $ 0 [12],[13],[21]     $ 0 [15],[16],[18]                
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[3] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[4] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[5] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[6] Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[7] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[8] Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
[9] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[10] Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[11] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[12] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[13] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[14] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[15] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[16] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[17] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[18] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[19] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[20] Investment is held by New Mountain Finance SBIC, L.P.
[21] Par 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.
[22] Par amount is denominated in U.S. Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[23] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. ("NMF Holdings") as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian. See Note 7. Borrowings, for details.
[24] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C. as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[25] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C. as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[26] Investment is held by New Mountain Finance SBIC, L.P.
[27] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, two first lien delayed draws and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum.
[28] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, two first lien delayed draws and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc.
[29] Investment is on non-accrual status. See Note 3. Investments, for details.
[30] All or a portion of interest contains PIK interest. See Note 2. Summary of Significant Accounting Policies-Revenue Recognition, for details.
[31] Investment is on non-accrual status. See Note 3. Investments, for details.
[32] All or a portion of interest contains PIK interest.
[33] Investment is held by NMF Ancora Holdings, Inc.
[34] Investment is held by NMF Ancora Holdings, Inc.
[35] The Company holds investments in two wholly-owned subsidiaries of Appriss Health Holdings, Inc. The company holds a first lien term loan and a first lien revolver in Appriss Health, LLC, and preferred equity in Appriss Health Intermediate Holdings, Inc. The preferred equity is entitled to receive preferential dividends at a rate of 11.0% per annum.
[36] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of March 31, 2024, 14.8% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[37] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2023, 14.8% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[38] The Company holds preferred equity in Bamboo Health Intermediate Holdings, Inc.(fka Appriss Health Intermediate Holdings, Inc.) and holds a first lien term loan and a first lien revolver in Bamboo Health Holdings, LLC (fka Appriss Health, LLC), a wholly-owned subsidiary of Bamboo Health Intermediate Holdings, Inc.
[39] Investment is held by New Mountain Finance SBIC II, L.P.
[40] Investment is held by New Mountain Finance SBIC II, L.P.
[41] The Company holds investments in two wholly-owned subsidiary of Diamond Parent Holdings Corp. The Company holds three first lien term loans and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc.
[42] The Company holds investments in two wholly-owned subsidiary of Diamond Parent Holdings Corp. The Company holds three first lien term loans and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The preferred equity in Diligent Preferred Issuer Inc. is entitled to receive cumulative preferential dividends at a rate 10.5% per annum.
[43] The Company holds ordinary shares in TVG-Edmentum Holdings, LLC, and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC.
[44] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and three first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[45] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and three first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[46] Investment is held by NMF HB, Inc.
[47] Investment is held by NMF HB, Inc.
[48] Investment is held by NMF TRM, LLC.
[49] Investment is held by NMF TRM, LLC.
[50] Investment is held by NMF QID NGL Holdings, Inc.
[51] Investment is held by NMF QID NGL Holdings, Inc.
[52] The Company holds investments in multiple entities of Haven Midstream Holdings LLC. The Company holds 4.6% of the Class B profits interest in QID NGL, LLC (which at closing represented 97.0% of the ownership in the class B units in QID TRH Holdings, LLC), class A common units of Haven Midstream Holdings LLC, and holds a first lien revolver in Haven Midstream LLC.
[53] The Company holds preferred equity in Knockout Intermediate Holdings I Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Kaseya, Inc., a wholly-owned subsidiary of Knockout Intermediate Holdings I Inc.
[54] The Company holds preferred equity in Knockout Intermediate Holdings I Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Kaseya, Inc., a wholly-owned subsidiary of Knockout Intermediate Holdings I Inc. The preferred equity is entitled to received cumulative preferential dividends at a rate of 11.75% per annum.
[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] Investment is held by New Mountain Net Lease Corporation.
[57] Investment is held by New Mountain Net Lease Corporation.
[58] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of March 31, 2024, the par value U.S. dollar equivalent of the Tennesee Bidco Limited first lien term loan and drawn first lien term loans is $16,669 and $14,421, respectively, and the Nelipak Holding Company first lien term loan, undrawn first lien term loan and undrawn revolver is $17,964, $6,917 and $1,290, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[59] The Company holds ordinary shares in OA Topco, L.P., and two first lien term loans and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[60] The Company holds ordinary shares in OA Topco, L.P., and two first lien term loans and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[61] Investment is held by NMF OEC, Inc.
[62] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC. The preferred equity is entitled to receive preferential dividends of 11.0% per annum.
[63] Investment is held by NMF OEC, Inc.
[64] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC.
[65] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,500 as of March 31, 2024. See Note 2. Summary of Significant Accounting Policies, for details.
[66] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $16,500 as of December 31, 2023. See Note 2. Summary of Significant Accounting Policies, for details.
[67] Investment is held by NMF Permian Holdings, LLC.
[68] Investment is held by NMF Permian Holdings, LLC.
[69] 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.
[70] 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.
[71] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2023, the par value U.S. dollar equivalent of the first lien term loan, and drawn first lien term loan is $16,600 and $14,457, respectively. See Note 2. Summary of Significant Accounting Policies, for details.