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Investments - Investment Portfolio at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Summary of Investment Holdings [Line Items]    
Fair Value $ 2,448,935 $ 1,800,594
Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 1,696,192 1,221,598
Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 263,139 240,037
Structured Products    
Summary of Investment Holdings [Line Items]    
Fair Value 73,550 40,271
Equity shares    
Summary of Investment Holdings [Line Items]    
Fair Value 284,570 154,477
Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair Value 1,057 1,107
Investment in joint ventures / PE fund    
Summary of Investment Holdings [Line Items]    
Fair Value 130,427 143,104
Level 1    
Summary of Investment Holdings [Line Items]    
Fair Value 164 111
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 164 111
Level 1 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair Value 0 0
Level 2    
Summary of Investment Holdings [Line Items]    
Fair Value 190,823 137,341
Level 2 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 104,836 84,275
Level 2 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 28,925 9,468
Level 2 | Structured Products    
Summary of Investment Holdings [Line Items]    
Fair Value 55,723 40,271
Level 2 | Equity shares    
Summary of Investment Holdings [Line Items]    
Fair Value 1,339 3,084
Level 2 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair Value 0 243
Level 3    
Summary of Investment Holdings [Line Items]    
Fair Value 2,127,521 1,520,038
Level 3 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 1,591,356 1,137,323
Level 3 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair Value 234,214 230,569
Level 3 | Structured Products    
Summary of Investment Holdings [Line Items]    
Fair Value 17,827 0
Level 3 | Equity shares    
Summary of Investment Holdings [Line Items]    
Fair Value 283,067 151,282
Level 3 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair Value 1,057 864
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Summary of Investment Holdings [Line Items]    
Fair Value 2,318,508 1,657,490
Fair Value Measured at Net Asset Value Per Share    
Summary of Investment Holdings [Line Items]    
Fair Value $ 130,427 $ 143,104