DERIVATIVES AND HEDGING - Fair Value of Derivatives of Consolidated Funds (Details) - Not Designated as Hedging Instrument - Consolidated Funds - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Notional	$ 789,452	$ 556,036
Fair Value	9,308	9,133
Liabilities
Notional	(226,201)	(281,450)
Fair Value	(18,961)	(22,230)
Foreign-currency forward contracts
Assets
Notional	739,304	508,174
Fair Value	1,591	475
Liabilities
Notional	(26,973)	(118,263)
Fair Value	(16,218)	(21,659)
Total-return and interest-rate and credit default swaps
Assets
Notional	34,351	41,113
Fair Value	7,711	8,658
Liabilities
Notional	(43,588)	0
Fair Value	(29)	0
Options and futures
Assets
Notional	15,797	6,749
Fair Value	6	0
Liabilities
Notional	(155,640)	(163,187)
Fair Value	$ (2,714)	$ (571)