FAIR VALUE MEASUREMENTS - Unobservable Inputs Relevant to the Company's Determination of Fair Value (Parenthetical) (Details) $ in Thousands |
Jun. 30, 2026
USD ($)
Investment
|
Dec. 31, 2025
USD ($)
Investment
|
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||||||||||||
| Investments, at fair value | $ 3,554,287 | [1],[2] | $ 3,771,546 | [3],[4] | ||||||||
| Level 3 | ||||||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||||||||||||
| Investments, at fair value | 3,412,178 | 3,711,453 | ||||||||||
| Level 3 | Investment Preferred Equity [Member] | Market Approach | ||||||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||||||||||||
| Investments, at fair value | $ 2,900 | |||||||||||
| Investment owned, transitions, number | Investment | 2 | |||||||||||
| Level 3 | Investments in Unsecured Debt [Member] | Yield Analysis | ||||||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||||||||||||
| Investments, at fair value | $ 39,200 | |||||||||||
| Investment owned, transitions, number | Investment | 5 | |||||||||||
| Level 3 | Investments in Unsecured Debt [Member] | Market Approach | ||||||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||||||||||||
| Investments, at fair value | $ 18,200 | $ 123,800 | ||||||||||
| Investment owned, transitions, number | Investment | 2 | 8 | ||||||||||
| Level 3 | Investments in Unsecured Debt [Member] | EBITDA multiple | ||||||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||||||||||||
| Investments, at fair value | $ 4,200 | |||||||||||
| Level 3 | Equity Investment [Member] | Market Approach | ||||||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | ||||||||||||
| Investments, at fair value | $ 1,400 | |||||||||||
| Investment owned, transitions, number | Investment | 1 | |||||||||||
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