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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Fair Value $ 2,571,228 $ 2,449,272
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,819,640 1,686,411
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 159,085 165,455
Structured products    
Schedule of Investments [Line Items]    
Fair Value 53,766 79,548
Equity shares    
Schedule of Investments [Line Items]    
Fair Value 434,144 409,129
Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 2,802 2,732
Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 6,379 5,833
Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 2,475,816 2,349,108
Investment in joint ventures    
Schedule of Investments [Line Items]    
Fair Value 95,412  
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 51,848 60,910
Level 2 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 18,613 11,752
Level 2 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 30,262 30,884
Level 2 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 5,101 654
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 105,824 104,200
Level 3 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,767,792 1,625,501
Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 140,472 153,703
Level 3 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 23,504 48,664
Level 3 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 429,043 408,475
Level 3 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 2,802 2,732
Level 3 | Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 6,379 5,833
Level 3 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value $ 2,369,992 $ 2,244,908