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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 (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | $ 164,948 | $ 158,496
Total foreign exchange gains (losses) | (19) | (10)
Purchases | (300) | 9,719
Settlements |  | (455)
Balance at end of the period | 166,420 | 161,114
Net investment income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 62 | 605
Net realized and unrealized gains (losses) on investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 709 | (8,150)
Other income (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 1,020 | 909
Direct private equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of the period | 66,780 | 88,373
Total foreign exchange gains (losses) | (19) | (10)
Purchases | 0 | 0
Settlements |  | 0
Balance at end of the period | 67,532 | 80,213
Direct private equity investments | Net investment income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 62 | 0
Direct private equity investments | Net realized and unrealized gains (losses) on investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 709 | (8,150)
Direct private equity investments | Other income (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 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 | 74,850
Total foreign exchange gains (losses) | 0 | 0
Purchases | 0 | 10,000
Settlements |  | (455)
Balance at end of the period | 100,000 | 85,000
Term loans | Net investment income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 0 | 605
Term loans | 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
Term loans | Other income (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 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 | (1,832) | (4,727)
Total foreign exchange gains (losses) | 0 | 0
Purchases | (300) | (281)
Settlements |  | 0
Balance at end of the period | (1,112) | (4,099)
Other assets and (liabilities) | Net investment income |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | 0 | 0
Other assets and (liabilities) | 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
Other assets and (liabilities) | Other income (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Included in earnings | $ 1,020 | $ 909

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