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Investments - Investment Portfolio at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Summary of Investment Holdings [Line Items]    
Fair Value $ 2,488,715 [1] $ 2,448,935
Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 1,670,300 1,696,192
Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 238,215 263,139
Structured Products    
Summary of Investment Holdings [Line Items]    
Fair Value 93,038 73,550
Equity shares    
Summary of Investment Holdings [Line Items]    
Fair Value 374,704 284,570
Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair Value 2,392 1,057
Investments in joint ventures / PE fund    
Summary of Investment Holdings [Line Items]    
Fair Value 110,066 130,427
Level 1    
Summary of Investment Holdings [Line Items]    
Fair Value 132 164
Level 1 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 0 0
Level 1 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 0 0
Level 1 | Structured Products    
Summary of Investment Holdings [Line Items]    
Fair Value 0 0
Level 1 | Equity shares    
Summary of Investment Holdings [Line Items]    
Fair Value 132 164
Level 1 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair Value 0 0
Level 2    
Summary of Investment Holdings [Line Items]    
Fair Value 140,986 190,823
Level 2 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 76,503 104,836
Level 2 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 14,417 28,925
Level 2 | Structured Products    
Summary of Investment Holdings [Line Items]    
Fair Value 50,066 55,723
Level 2 | Equity shares    
Summary of Investment Holdings [Line Items]    
Fair Value 0 1,339
Level 2 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair Value 0 0
Level 3    
Summary of Investment Holdings [Line Items]    
Fair Value 2,237,531 2,127,521
Level 3 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 1,593,797 1,591,356
Level 3 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 223,798 234,214
Level 3 | Structured Products    
Summary of Investment Holdings [Line Items]    
Fair Value 42,972 17,827
Level 3 | Equity shares    
Summary of Investment Holdings [Line Items]    
Fair Value 374,572 283,067
Level 3 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair Value 2,392 1,057
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Summary of Investment Holdings [Line Items]    
Fair Value 2,378,649 2,318,508
Fair Value Measured at Net Asset Value Per Share    
Summary of Investment Holdings [Line Items]    
Fair Value $ 110,066 $ 130,427
[1] Fair value as a percentage of net assets.