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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Fair Value $ 2,521,635 $ 2,448,935 [1]
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,700,689 1,696,192
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 257,633 263,139
Structured products    
Schedule of Investments [Line Items]    
Fair Value 89,731 73,550
Equity shares    
Schedule of Investments [Line Items]    
Fair Value 355,690 284,570
Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 1,246 1,057
Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 2,404,989 2,318,508
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Fair Value 116,646 130,427
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 69 164
Level 1 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 0 0
Level 1 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value 69 164
Level 2 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 98,362 104,836
Level 2 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 14,036 28,925
Level 2 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 54,131 55,723
Level 2 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 0 1,339
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 166,529 190,823
Level 3 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,602,327 1,591,356
Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 243,597 234,214
Level 3 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 35,600 17,827
Level 3 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 355,621 283,067
Level 3 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 1,246 1,057
Level 3 | Investments subject to leveling    
Schedule of Investments [Line Items]    
Fair Value $ 2,238,391 $ 2,127,521
[1] All of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.