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Investments - Schedule of Composition of Investment Portfolio at Cost And Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Summary of Investment Holdings [Line Items]    
Total investments at fair value $ 2,449,272 $ 2,488,715
Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 1,686,411 1,670,300
Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 165,455 238,215
Structured Product    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 79,548 93,038
Equity shares    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 409,129 374,704
Equity warrants    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 2,732 2,392
Royalty rights    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 5,833  
Investments in joint ventures / PE fund    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 100,164 110,066
Level 1    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 0 132
Level 1 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 0 0
Level 1 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 0 0
Level 1 | Structured Product    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 0 0
Level 1 | Equity shares    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 0 132
Level 1 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 0 0
Level 1 | Royalty rights    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 0  
Level 2    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 104,200 140,986
Level 2 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 60,910 76,503
Level 2 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 11,752 14,417
Level 2 | Structured Product    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 30,884 50,066
Level 2 | Equity shares    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 654 0
Level 2 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 0
Level 2 | Royalty rights    
Summary of Investment Holdings [Line Items]    
Total investments at fair value  
Level 3    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 2,244,908 2,237,531
Level 3 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 1,625,501 1,593,797
Level 3 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 153,703 223,798
Level 3 | Structured Product    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 48,664 42,972
Level 3 | Equity shares    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 408,475 374,572
Level 3 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 2,732 2,392
Level 3 | Royalty rights    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 5,833  
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Summary of Investment Holdings [Line Items]    
Total investments at fair value 2,349,108 2,378,649
Fair Value Measured at Net Asset Value Per Share | Investment in joint ventures    
Summary of Investment Holdings [Line Items]    
Total investments at fair value $ 100,164  
Fair Value Measured at Net Asset Value Per Share | Investments in joint ventures / PE fund    
Summary of Investment Holdings [Line Items]    
Total investments at fair value   $ 110,066