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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Fair Value $ 2,505,992 [1] $ 2,448,935 [2]
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,700,975 1,696,192
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 246,997 263,139
Structured products    
Schedule of Investments [Line Items]    
Fair Value 81,068 73,550
Equity shares    
Schedule of Investments [Line Items]    
Fair Value 356,201 284,570
Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 1,144 1,057
Investments Subject to Leveling    
Schedule of Investments [Line Items]    
Fair Value 2,386,385 2,318,508
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Fair Value 119,607 130,427
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 121 164
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 121 164
Level 2 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 104,846 104,836
Level 2 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 37,907 28,925
Level 2 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 50,173 55,723
Level 2 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 905 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 193,831 190,823
Level 3 | Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Fair Value 1,596,129 1,591,356
Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Fair Value 209,090 234,214
Level 3 | Structured products    
Schedule of Investments [Line Items]    
Fair Value 30,895 17,827
Level 3 | Equity shares    
Schedule of Investments [Line Items]    
Fair Value 355,175 283,067
Level 3 | Equity warrants    
Schedule of Investments [Line Items]    
Fair Value 1,144 1,057
Level 3 | Investments Subject to Leveling    
Schedule of Investments [Line Items]    
Fair Value $ 2,192,433 $ 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 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 $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.