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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
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | $ 157,048 | $ 164,948
Included in net investment income |  |
Total foreign exchange gains (losses) | (4) | (19)
Purchases | 141 | (300)
Settlements | (225) | 0
Balance at end of the period | $ 156,880 | $ 166,420
Included in 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
Included in net investment income |  |
Included in earnings (loss) | $ 63 | $ 62
Included in 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
Included in net investment income |  |
Included in earnings (loss) | $ 0 | $ 709
Included in 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)
Included in net investment income |  |
Included in earnings (loss) | $ (143) | $ 1,020
Direct private equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | 59,905 | 66,780
Included in net investment income |  |
Total foreign exchange gains (losses) | (4) | (19)
Purchases | 0 | 0
Settlements | 0 |
Balance at end of the period | 59,964 | 67,532
Direct private equity investments | Included in net investment income |  |
Included in net investment income |  |
Included in earnings (loss) | 63 | 62
Direct private equity investments | Included in net realized and unrealized gains (losses) on investments |  |
Included in net investment income |  |
Included in earnings (loss) | 0 | 709
Direct private equity investments | Included in other income (loss) |  |
Included in net investment income |  |
Included in earnings (loss) | 0 | 0
Term loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | 97,658 | 100,000
Included in net investment income |  |
Total foreign exchange gains (losses) | 0 | 0
Purchases | 0 | 0
Settlements | (225) | 0
Balance at end of the period | 97,433 | 100,000
Term loans | Included in net investment income |  |
Included in net investment income |  |
Included in earnings (loss) | 0 | 0
Term loans | Included in net realized and unrealized gains (losses) on investments |  |
Included in net investment income |  |
Included in earnings (loss) | 0 | 0
Term loans | Included in 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 | (515) | (1,832)
Included in net investment income |  |
Total foreign exchange gains (losses) | 0 | 0
Purchases | 141 | (300)
Settlements | 0 | 0
Balance at end of the period | (517) | (1,112)
Other Assets and (Liabilities) | Included in net investment income |  |
Included in net investment income |  |
Included in earnings (loss) | 0 | 0
Other Assets and (Liabilities) | Included in net realized and unrealized gains (losses) on investments |  |
Included in net investment income |  |
Included in earnings (loss) | 0 | 0
Other Assets and (Liabilities) | Included in other income (loss) |  |
Included in net investment income |  |
Included in earnings (loss) | $ (143) | $ 1,020

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