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CONSOLIDATION (Variable Interest Entities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets of consolidated VIEs	$ 13,216,929		$ 12,014,196
Liabilities of consolidated VIEs	11,241,333		10,155,598
Investments in CLO warehouse
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the Company's investment in VIEs	64,900		104,700
Consolidated Funds
Variable Interest Entity [Line Items]
Net income (loss) attributable to non-controlling interests related to consolidated VIEs	(166,406)	$ 17,624
Non-Consolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the Company's investment in VIEs	235,751		260,520
Consolidated VIEs
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the Company's investment in VIEs	154,490		181,856
Consolidated VIEs \| Consolidated Funds
Variable Interest Entity [Line Items]
Assets of consolidated VIEs	9,990,390		9,454,572
Liabilities of consolidated VIEs	$ 9,308,677		$ 8,679,869