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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 178,546 | $ 75,151 | $ 158,496 | $ 73,596
Total foreign exchange gains (losses) | (50) | (9) | (60) | (5)
Purchases | (50) | 124 | 30,424 | 4,606
Settlements | 0 |  | (455) |
Sales |  | 0 |  | (946)
Balance at end of the period | 167,352 | 79,066 | 167,352 | 79,066
Net investment income |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 125 |  | 730 |
Net realized and unrealized gains (losses) on investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | (11,762) | 3,252 | (23,515) | 731
Other income (loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 543 | 548 | 1,732 | 1,084
Direct private equity investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 81,610 | 81,344 | 88,373 | 79,807
Total foreign exchange gains (losses) | (50) | (9) | (60) | (5)
Purchases | 0 | 0 | 5,000 | 5,000
Settlements | 0 |  | 0 |
Sales |  | 0 |  | (946)
Balance at end of the period | 69,923 | 84,587 | 69,923 | 84,587
Direct private equity investments | Net investment income |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Included in earnings | 125 |  | 125 |
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 | (11,762) | 3,252 | (23,515) | 731
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 | 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 | 0 | 74,850 | 0
Total foreign exchange gains (losses) | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 25,000 | 0
Settlements | 0 |  | (455) |
Sales |  | 0 |  | 0
Balance at end of the period | 100,000 | 0 | 100,000 | 0
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 | 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 | 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 | (3,064) | (6,193) | (4,727) | (6,211)
Total foreign exchange gains (losses) | 0 | 0 | 0 | 0
Purchases | (50) | 124 | 424 | (394)
Settlements | 0 |  | 0 |
Sales |  | 0 |  | 0
Balance at end of the period | (2,571) | (5,521) | (2,571) | (5,521)
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 | 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 | $ 543 | $ 548 | $ 1,732 | $ 1,084

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