INVESTMENTS - Net Gains (Losses) from Investment Activities of Consolidated Funds (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	$ 14,051	$ 4,214	$ 76,432	$ (68,885)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(9,359)	13,022	(47,330)	(13,971)
Consolidated Funds | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	14,051	4,214	76,432	(68,885)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(9,359)	13,022	(47,330)	(13,971)
Consolidated Funds | Investments and other financial instruments | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	9,364	12,800	66,831	(55,582)
Net Change in Unrealized Appreciation (Depreciation) on Investments	(22,929)	286	(64,867)	77,240
Consolidated Funds | CLO liabilities | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	0	(9,133)	0	(23,567)
Net Change in Unrealized Appreciation (Depreciation) on Investments	0	(5,230)	0	(92,030)
Consolidated Funds | Foreign-currency forward contracts | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	4	12,977	(1,517)	28,066
Net Change in Unrealized Appreciation (Depreciation) on Investments	14,990	16,823	4,410	29,245
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	693	727	810	1,009
Net Change in Unrealized Appreciation (Depreciation) on Investments	(480)	163	(24)	269
Consolidated Funds | Options and futures | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	1,495	416	2,567	10,497
Net Change in Unrealized Appreciation (Depreciation) on Investments	141	2,498	877	2,393
Consolidated Funds | Commodity swaps | Not Designated as Hedging Instrument
Gain (Loss) on Securities [Line Items]
Net Realized Gain (Loss) on Investments	2,495	(13,573)	7,741	(29,308)
Net Change in Unrealized Appreciation (Depreciation) on Investments	$ (1,081)	$ (1,518)	$ 12,274	$ (31,088)