DERIVATIVES AND HEDGING - Impact of Derivatives Held by Consolidated Funds on Income (Details) - Not Designated as Hedging Instrument - Consolidated Funds - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivatives, Fair Value [Line Items]
Net Realized Gain (Loss) on Investments	$ 3,936	$ 1,421
Net Change in Unrealized Appreciation (Depreciation) on Investments	4,399	10,776
Foreign-currency forward contracts
Derivatives, Fair Value [Line Items]
Net Realized Gain (Loss) on Investments	(351)	(1,614)
Net Change in Unrealized Appreciation (Depreciation) on Investments	5,735	(3,984)
Total-return and interest-rate and credit default swaps
Derivatives, Fair Value [Line Items]
Net Realized Gain (Loss) on Investments	0	(5)
Net Change in Unrealized Appreciation (Depreciation) on Investments	633	(12)
Options and futures
Derivatives, Fair Value [Line Items]
Net Realized Gain (Loss) on Investments	(206)	432
Net Change in Unrealized Appreciation (Depreciation) on Investments	(388)	(398)
Commodity swaps
Derivatives, Fair Value [Line Items]
Net Realized Gain (Loss) on Investments	4,493	2,608
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ (1,581)	$ 15,170