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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.

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