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FAIR VALUE MEASUREMENTS - Unobservable Inputs (Details) $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 3,293,205 | $ 3,193,561
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 3,219,673 | 3,117,354
Level 3 | First Lien Debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | 3,093,759 | 2,979,870
Level 3 | First Lien Debt | Yield Analysis | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 3,093,759 | $ 2,979,870
Level 3 | First Lien Debt | Yield Analysis | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.0899 | 0.0861
Level 3 | First Lien Debt | Yield Analysis | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.2519 | 0.2509
Level 3 | First Lien Debt | Yield Analysis | Weighted Average(1) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1137 | 0.1100
Level 3 | Second Lien Debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 82,186 | $ 96,848
Level 3 | Second Lien Debt | Yield Analysis | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 82,186 | $ 96,848
Level 3 | Second Lien Debt | Yield Analysis | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1119 | 0.1080
Level 3 | Second Lien Debt | Yield Analysis | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1577 | 0.3113
Level 3 | Second Lien Debt | Yield Analysis | Weighted Average(1) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1379 | 0.1437
Level 3 | Unsecured debt | Income Approach | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 1,912 | $ 1,894
Level 3 | Unsecured debt | Income Approach | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1470 | 0.1460
Level 3 | Unsecured debt | Income Approach | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1470 | 0.1460
Level 3 | Unsecured debt | Income Approach | Weighted Average(1) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1470 | 0.1460
Level 3 | Unsecured debt | Market Approach | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 251 | $ 170
Level 3 | Unsecured debt | Market Approach | Low | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 9 | 9
Level 3 | Unsecured debt | Market Approach | High | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 9 | 9
Level 3 | Unsecured debt | Market Approach | Weighted Average(1) | 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 | $ 20,778 | $ 18,758
Level 3 | Preferred equity | Income Approach | Low | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.0990 | 0.1219
Level 3 | Preferred equity | Income Approach | High | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.2476 | 0.1568
Level 3 | Preferred equity | Income Approach | Weighted Average(1) | Discount Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1245 | 0.1347
Level 3 | Preferred equity | Market Approach | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 1,275 | $ 1,275
Level 3 | Preferred equity | Market Approach | Low | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 7.5 | 7.5
Level 3 | Preferred equity | Market Approach | High | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 7.5 | 7.5
Level 3 | Preferred equity | Market Approach | Weighted Average(1) | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 7.5 | 7.5
Level 3 | Common equity | Market Approach | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 17,225 | $ 16,600
Level 3 | Common equity | Market Approach | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 2,287 | $ 1,939
Level 3 | Common equity | Market Approach | Low | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 8.05 | 8.1
Level 3 | Common equity | Market Approach | Low | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 7.58 | 7.6
Level 3 | Common equity | Market Approach | High | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 18.72 | 18.7
Level 3 | Common equity | Market Approach | High | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 8.75 | 9.8
Level 3 | Common equity | Market Approach | Weighted Average(1) | EBITDA Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 13.03 | 13.26
Level 3 | Common equity | Market Approach | Weighted Average(1) | Revenue Multiple |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 8.35 | 8.47

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