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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value $ 2,527,537 $ 2,488,715
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,658,742 1,670,300
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 246,902 238,215
Structured products    
Schedule of Investments [Line Items]    
Fair Value 95,131 93,038
Equity shares    
Schedule of Investments [Line Items]    
Fair Value 413,482 374,704
Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 2,586 2,392
Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 2,416,843 2,378,649
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Fair Value 110,694 110,066
Level 1 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 0 0
Level 1 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 0 0
Level 1 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 0 0
Level 1 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 16,985 132
Level 1 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 77 0
Level 1 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 17,062 132
Level 2 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 63,325 76,503
Level 2 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 14,694 14,417
Level 2 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 49,922 50,066
Level 2 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 5,381 0
Level 2 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 0 0
Level 2 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 133,322 140,986
Level 3 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,595,417 1,593,797
Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 232,208 223,798
Level 3 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 45,209 42,972
Level 3 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 391,116 374,572
Level 3 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 2,509 2,392
Level 3 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value $ 2,266,459 $ 2,237,531