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INVESTMENTS - Investment Portfolio at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Summary of Investment Holdings [Line Items]    
Fair value of investment owned $ 2,332,492 [1] $ 1,800,594 [2]
Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 1,557,396 1,221,598
Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 279,838 240,037
Structured products    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 67,811 40,271
Equity shares    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 279,564 154,477
Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 44 1,107
Investments subject to leveling    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 2,184,653 1,657,490
Investment in joint ventures / PE fund    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 147,839 143,104
Level 1 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 0 0
Level 1 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 0 0
Level 1 | Structured products    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 0 0
Level 1 | Equity shares    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 210 111
Level 1 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 0 0
Level 1 | Investments subject to leveling    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 210 111
Level 2 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 94,983 84,275
Level 2 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 9,843 9,468
Level 2 | Structured products    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 58,329 40,271
Level 2 | Equity shares    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 1,866 3,084
Level 2 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 41 243
Level 2 | Investments subject to leveling    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 165,062 137,341
Level 3 | Senior debt and 1st lien notes    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 1,462,413 1,137,323
Level 3 | Subordinated debt and 2nd lien notes    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 269,995 230,569
Level 3 | Structured products    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 9,482 0
Level 3 | Equity shares    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 277,488 151,282
Level 3 | Equity warrants    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned 3 864
Level 3 | Investments subject to leveling    
Summary of Investment Holdings [Line Items]    
Fair value of investment owned $ 2,019,381 $ 1,520,038
[1] Some or 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] Some or all of the investment is or will be encumbered as security for the Company's senior secured credit facility with ING Capital LLC.