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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Fair Value $ 2,536,315 [1] $ 2,449,272 [2]
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,785,626 1,686,411
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 201,371 165,455
Structured products    
Schedule of Investments [Line Items]    
Fair Value 33,602 79,548
Equity shares    
Schedule of Investments [Line Items]    
Fair Value 425,580 409,129
Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 1,068 2,732
Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 1,581 5,833
Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 2,448,828 2,349,108
Investment in joint ventures    
Schedule of Investments [Line Items]    
Fair Value 87,487  
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 47,559 60,910
Level 2 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 9,699 11,752
Level 2 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 15,825 30,884
Level 2 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 4,637 654
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 77,720 104,200
Level 3 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,738,067 1,625,501
Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 191,672 153,703
Level 3 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 17,777 48,664
Level 3 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 420,943 408,475
Level 3 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 1,068 2,732
Level 3 | Royalty rights    
Schedule of Investments [Line Items]    
Fair Value 1,581 5,833
Level 3 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value $ 2,371,108 $ 2,244,908
[1] All of the investment is or will be encumbered as security for the Company’s $0.7 billion senior secured credit facility with ING Capital LLC (“ING”) initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[2] All of the investment is or will be encumbered as security for the Company’s $0.8 billion February 2019 Credit Facility with ING.