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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value $ 2,395,660 $ 2,488,715
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,581,827 1,670,300
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 226,055 238,215
Structured products    
Schedule of Investments [Line Items]    
Fair Value 92,487 93,038
Equity shares    
Schedule of Investments [Line Items]    
Fair Value 383,304 374,704
Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 2,624 2,392
Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 3,871  
Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 2,290,168 2,378,649
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Fair Value 105,492 110,066
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 0 132
Level 1 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 0 0
Level 1 | Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 0  
Level 1 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 0 132
Level 2 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 61,880 76,503
Level 2 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 13,032 14,417
Level 2 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 46,987 50,066
Level 2 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 709 0
Level 2 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 0 0
Level 2 | Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 0  
Level 2 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 122,608 140,986
Level 3 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,519,947 1,593,797
Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 213,023 223,798
Level 3 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 45,500 42,972
Level 3 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 382,595 374,572
Level 3 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 2,624 2,392
Level 3 | Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 3,871  
Level 3 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value $ 2,167,560 $ 2,237,531