CONSOLIDATION - Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets of consolidated VIEs	$ 21,605,164	$ 15,168,992
Liabilities of consolidated VIEs	16,694,730	12,596,852
Collateralized loan obligations and other fixed income, at fair value
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the company's investment in VIEs	103,800	107,700
Consolidated Funds
Variable Interest Entity [Line Items]
Net income attributable to non-controlling interests related to consolidated VIEs	120,369	28,085	$ 39,704
Non-Consolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the company's investment in VIEs	353,768	224,203
Consolidated VIEs
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the company's investment in VIEs	583,192	391,963
Consolidated VIEs | Consolidated Funds
Variable Interest Entity [Line Items]
Assets of consolidated VIEs	13,197,321	11,580,003
Liabilities of consolidated VIEs	12,018,655	10,716,438
Net income attributable to non-controlling interests related to consolidated VIEs	$ 115,217	$ 28,085