FAIR VALUE MEASUREMENTS - Unobservable Inputs (Parenthetical) (Details) $ in Thousands |
Jun. 30, 2026
USD ($)
Investment
|
Mar. 31, 2026
USD ($)
|
Dec. 31, 2025
USD ($)
Investment
|
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|---|---|---|---|---|---|---|---|---|---|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |||||||||
| Investment owned at fair value | $ 2,216,776 | [1] | $ 2,185,948 | [2] | |||||
| Equity Securities [Member] | |||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |||||||||
| Investment owned at fair value | 32,711 | 19,127 | |||||||
| Level 3 | |||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |||||||||
| Investment owned at fair value | $ 2,207,647 | $ 2,148,640 | |||||||
| Level 3 | Investments in Unsecured Debt [Member] | Yield Analysis | |||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |||||||||
| Investment owned, transitions, number | Investment | 1 | ||||||||
| Investment owned at fair value | $ 13,340 | ||||||||
| Level 3 | Investments in Unsecured Debt [Member] | Market Approach | EBITDA Multiple | |||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |||||||||
| Investment owned, transitions, number | Investment | 9 | ||||||||
| Investment owned at fair value | $ 57,000 | ||||||||
| Level 3 | Equity Securities [Member] | |||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |||||||||
| Investment owned at fair value | $ 32,711 | $ 19,127 | |||||||
| Level 3 | Equity Securities [Member] | Market Approach | EBITDA Multiple | |||||||||
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |||||||||
| Investment owned at fair value | $ 1,000 | ||||||||
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