INVESTMENTS - Net Gains (Losses) from Investment Activities of Consolidated Funds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	$ 31,680	$ (89,225)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(25,182)	128,359
Consolidated Funds | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	31,680	(89,225)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(25,182)	128,359
Consolidated Funds | Investments and other financial instruments | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	30,259	(90,055)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(35,958)	201,267
Consolidated Funds | CLO liabilities | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	0	(2,115)
Net Change in Unrealized Appreciation (Depreciation) on Investments	0	(45,844)
Consolidated Funds | Foreign-currency forward contracts | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(1,614)	956
Net Change in Unrealized Appreciation (Depreciation) on Investments	(3,984)	2,928
Consolidated Funds | Total-return and interest-rate swaps | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	(5)	(3,984)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(12)	(32,833)
Consolidated Funds | Options and futures | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	432	5,973
Net Change in Unrealized Appreciation (Depreciation) on Investments	(398)	1,983
Consolidated Funds | Commodity swaps | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	2,608	0
Net Change in Unrealized Appreciation (Depreciation) on Investments	15,170	0
Consolidated Funds | Warrants | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	0	0
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ 0	$ 858