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FAIR VALUE MEASUREMENTS - 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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 166,420 | $ 161,114 | $ 164,948 | $ 158,496
Total foreign exchange gains (losses) | 13 |  | (6) | (10)
Purchases | 1,666 | 20,755 | 1,366 | 30,474
Settlements |  |  |  | (455)
Balance at end of the period | 170,680 | 178,546 | 170,680 | 178,546
Included in net investment income |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 62 | 0 | 124 | 605
Included in net realized and unrealized gains (losses) on investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 3,548 | (3,603) | 4,257 | (11,753)
Included in other income (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | (1,029) | 280 | (9) | 1,189
Direct private equity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 67,532 | 80,213 | 66,780 | 88,373
Total foreign exchange gains (losses) | 13 |  | (6) | (10)
Purchases | 0 | 5,000 | 0 | 5,000
Settlements |  |  |  | 0
Balance at end of the period | 71,155 | 81,610 | 71,155 | 81,610
Direct private equity investments | Included in net investment income |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 62 | 0 | 124 | 0
Direct private equity investments | Included in net realized and unrealized gains (losses) on investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 3,548 | (3,603) | 4,257 | (11,753)
Direct private equity investments | Included in other income (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 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 | 100,000 | 85,000 | 100,000 | 74,850
Total foreign exchange gains (losses) | 0 |  | 0 | 0
Purchases | 0 | 15,000 | 0 | 25,000
Settlements |  |  |  | (455)
Balance at end of the period | 100,000 | 100,000 | 100,000 | 100,000
Term loans | Included in net investment income |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 0 | 0 | 0 | 605
Term loans | Included in net realized and unrealized gains (losses) on investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 0 | 0 | 0 | 0
Term loans | Included in other income (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 0 | 0 | 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 | (1,112) | (4,099) | (1,832) | (4,727)
Total foreign exchange gains (losses) | 0 |  | 0 | 0
Purchases | 1,666 | 755 | 1,366 | 474
Settlements |  |  |  | 0
Balance at end of the period | (475) | (3,064) | (475) | (3,064)
Other assets and (liabilities) | Included in net investment income |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 0 | 0 | 0 | 0
Other assets and (liabilities) | Included in net realized and unrealized gains (losses) on investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 0 | 0 | 0 | 0
Other assets and (liabilities) | Included in other income (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | $ (1,029) | $ 280 | $ (9) | $ 1,189

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