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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 76,094 | $ 141,477 | $ 43,372 | $ 157,048
Included in net investment income |  |  |  |
Net foreign exchange gains (losses) | (10) | 26 | 33 | 23
Purchases | 1,222 | 4,076 | 42,681 | 4,217
Settlements | (3,346) | (2,145) | (4,107) | (3,265)
Balance at end of the period | $ 71,244 | 145,112 | $ 71,244 | 145,112
Significant Unobservable Inputs (Level 3) |  |  |  |
Included in net investment income |  |  |  |
Sales |  | $ (3,896) |  | $ (3,896)
Net investment income |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net Investment Income | Net Investment Income | Net Investment Income | Net Investment Income
Included in net investment income |  |  |  |
Included in earnings (loss) | $ 1,062 | $ 125 | $ 1,201 | $ 188
Net realized and unrealized gains (losses) on investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net realized and unrealized gains (losses) on investments | Net realized and unrealized gains (losses) on investments | Net realized and unrealized gains (losses) on investments | Net realized and unrealized gains (losses) on investments
Included in net investment income |  |  |  |
Included in earnings (loss) | $ (3,868) | $ 5,298 | $ (12,519) | $ (9,389)
Other income (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (loss) | Other income (loss) | Other income (loss) | Other income (loss)
Included in net investment income |  |  |  |
Included in earnings (loss) | $ 90 | $ 151 | $ 583 | $ 186
Asset-backed |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 40,936 |  | 0 |
Included in net investment income |  |  |  |
Net foreign exchange gains (losses) | 0 |  | 0 |
Purchases | 222 |  | 41,681 |
Settlements | (3,313) |  | (3,836) |
Balance at end of the period | 38,825 |  | 38,825 |
Asset-backed | Net investment income |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | 980 |  | 980 |
Asset-backed | Net realized and unrealized gains (losses) on investments |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | 0 |  | 0 |
Asset-backed | Other income (loss) |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | 0 |  | 0 |
Direct Private Equity Investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 35,308 | 45,278 | 43,777 | 59,905
Included in net investment income |  |  |  |
Net foreign exchange gains (losses) | (10) | 26 | 33 | 23
Purchases | 1,000 | 577 | 1,000 | 577
Settlements | 0 | 0 | 0 | 0
Balance at end of the period | 32,512 | 51,034 | 32,512 | 51,034
Direct Private Equity Investments | Significant Unobservable Inputs (Level 3) |  |  |  |
Included in net investment income |  |  |  |
Sales |  | (270) |  | (270)
Direct Private Equity Investments | Net investment income |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | 82 | 125 | 221 | 188
Direct Private Equity Investments | Net realized and unrealized gains (losses) on investments |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | (3,868) | 5,298 | (12,519) | (9,389)
Direct Private Equity Investments | Other income (loss) |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | 0 | 0 | 0 | 0
Term Loans |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period |  | 96,639 |  | 97,658
Included in net investment income |  |  |  |
Net foreign exchange gains (losses) |  | 0 |  | 0
Purchases |  | 0 |  | 0
Settlements |  | (2,064) |  | (3,083)
Balance at end of the period |  | 94,575 |  | 94,575
Term Loans | Significant Unobservable Inputs (Level 3) |  |  |  |
Included in net investment income |  |  |  |
Sales |  | 0 |  | 0
Term Loans | Net investment income |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) |  | 0 |  | 0
Term Loans | Net realized and unrealized gains (losses) on investments |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) |  | 0 |  | 0
Term Loans | Other income (loss) |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) |  | 0 |  | 0
Other Assets and (Liabilities) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | (150) | (440) | (405) | (515)
Included in net investment income |  |  |  |
Net foreign exchange gains (losses) | 0 | 0 | 0 | 0
Purchases | 0 | 3,499 | 0 | 3,640
Settlements | (33) | (81) | (271) | (182)
Balance at end of the period | (93) | (497) | (93) | (497)
Other Assets and (Liabilities) | Significant Unobservable Inputs (Level 3) |  |  |  |
Included in net investment income |  |  |  |
Sales |  | (3,626) |  | (3,626)
Other Assets and (Liabilities) | Net investment income |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | 0 | 0 | 0 | 0
Other Assets and (Liabilities) | Net realized and unrealized gains (losses) on investments |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | 0 | 0 | 0 | 0
Other Assets and (Liabilities) | Other income (loss) |  |  |  |
Included in net investment income |  |  |  |
Included in earnings (loss) | $ 90 | $ 151 | $ 583 | $ 186

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