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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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Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

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