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FAIR VALUE MEASUREMENTS - Unobservable Inputs (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 3,791,494 | $ 3,193,561
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 3,686,956 | 3,117,354
Level 3 | First Lien Debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 3,603,209 | 2,979,870
Level 3 | First Lien Debt | Yield Analysis | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 3,597,236 | $ 2,979,870
Level 3 | First Lien Debt | Yield Analysis | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.0805 | 0.0861
Level 3 | First Lien Debt | Yield Analysis | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.3406 | 0.2509
Level 3 | First Lien Debt | Yield Analysis | Weighted Average(3) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1031 | 0.1100
Level 3 | First Lien Debt | Market Approach | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 5,973 |
Level 3 | First Lien Debt | Market Approach | Weighted Average(3) | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.065 |
Level 3 | Second Lien Debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 33,351 | $ 96,848
Level 3 | Second Lien Debt | Yield Analysis | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 33,351 | $ 96,848
Level 3 | Second Lien Debt | Yield Analysis | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1018 | 0.1080
Level 3 | Second Lien Debt | Yield Analysis | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1641 | 0.3113
Level 3 | Second Lien Debt | Yield Analysis | Weighted Average(3) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1509 | 0.1437
Level 3 | Other Debt Investments |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 9,198 | $ 2,064
Level 3 | Other Debt Investments | Yield Analysis | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 8,313 |
Level 3 | Other Debt Investments | Yield Analysis | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.0942 |
Level 3 | Other Debt Investments | Yield Analysis | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1490 |
Level 3 | Other Debt Investments | Yield Analysis | Weighted Average(3) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1074 |
Level 3 | Other Debt Investments | Income Approach | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value |  | $ 1,894
Level 3 | Other Debt Investments | Income Approach | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input |  | 0.1460
Level 3 | Other Debt Investments | Income Approach | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input |  | 0.1460
Level 3 | Other Debt Investments | Income Approach | Weighted Average(3) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input |  | 0.1460
Level 3 | Other Debt Investments | Market Approach | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 885 | $ 170
Level 3 | Other Debt Investments | Market Approach | Low | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input |  | 9
Level 3 | Other Debt Investments | Market Approach | High | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input |  | 9
Level 3 | Other Debt Investments | Market Approach | Weighted Average(3) | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 9 | 9
Level 3 | Preferred equity | Income Approach | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 22,694 | $ 18,758
Level 3 | Preferred equity | Income Approach | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1215 | 0.1219
Level 3 | Preferred equity | Income Approach | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1750 | 0.1568
Level 3 | Preferred equity | Income Approach | Weighted Average(3) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1371 | 0.1347
Level 3 | Preferred equity | Market Approach | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 923 | $ 1,275
Level 3 | Preferred equity | Market Approach | Low | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input |  | 7.5
Level 3 | Preferred equity | Market Approach | High | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input |  | 7.5
Level 3 | Preferred equity | Market Approach | Weighted Average(3) | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 8.5 | 7.5
Level 3 | Common equity | Market Approach | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 14,442 | $ 16,600
Level 3 | Common equity | Market Approach | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 3,139 | $ 1,939
Level 3 | Common equity | Market Approach | Low | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 3.9 | 8.1
Level 3 | Common equity | Market Approach | Low | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 7.6 | 7.6
Level 3 | Common equity | Market Approach | High | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 18.7 | 18.7
Level 3 | Common equity | Market Approach | High | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 12.7 | 9.8
Level 3 | Common equity | Market Approach | Weighted Average(3) | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 13.47 | 13.26
Level 3 | Common equity | Market Approach | Weighted Average(3) | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 8.8 | 8.47
Level 3 | Other Security Investments, Unsecured Debt | Yield Analysis |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 2,010 |

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