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INVESTMENTS - Investment Portfolio at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 2,556,114 | $ 2,448,935
Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 1,765,238 | 1,696,192
Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 255,089 | 263,139
Structured products |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 79,343 | 73,550
Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 331,880 | 284,570
Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 1,056 | 1,057
Investments Subject to Leveling |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 2,432,606 | 2,318,508
Investment in joint ventures / PE fund |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 123,508 | 130,427
Level 1 | Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Structured products |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 145 | 164
Level 1 | Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Investments Subject to Leveling |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 145 | 164
Level 2 | Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 114,877 | 104,836
Level 2 | Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 29,355 | 28,925
Level 2 | Structured products |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 53,227 | 55,723
Level 2 | Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 2,751 | 1,339
Level 2 | Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 0 | 0
Level 2 | Investments Subject to Leveling |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 200,210 | 190,823
Level 3 | Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 1,650,361 | 1,591,356
Level 3 | Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 225,734 | 234,214
Level 3 | Structured products |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 26,116 | 17,827
Level 3 | Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 328,984 | 283,067
Level 3 | Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 1,056 | 1,057
Level 3 | Investments Subject to Leveling |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 2,232,251 | $ 2,127,521

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