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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Fair Value $ 2,623,882 $ 2,449,272
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,851,109 1,686,411
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 192,468 165,455
Structured products    
Schedule of Investments [Line Items]    
Fair Value 45,658 79,548
Equity shares    
Schedule of Investments [Line Items]    
Fair Value 440,536 409,129
Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 1,087 2,732
Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 1,542 5,833
Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 2,532,400 2,349,108
Investment in joint ventures    
Schedule of Investments [Line Items]    
Fair Value 91,482  
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Fair Value   100,164
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 0
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 0
Level 1 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 0 0
Level 2 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 55,857 60,910
Level 2 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 7,852 11,752
Level 2 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 26,404 30,884
Level 2 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 884 654
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 0
Level 2 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 90,997 104,200
Level 3 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,795,252 1,625,501
Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 184,616 153,703
Level 3 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 19,254 48,664
Level 3 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 439,652 408,475
Level 3 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 1,087 2,732
Level 3 | Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 1,542 5,833
Level 3 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value $ 2,441,403 $ 2,244,908