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CONSOLIDATION (Variable Interest Entities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets of consolidated VIEs	$ 10,421,600		$ 10,421,600		$ 8,563,522
Liabilities of consolidated VIEs	8,930,281		8,930,281		7,103,230
Consolidated Funds
Variable Interest Entity [Line Items]
Net income attributable to non-controlling interests related to consolidated VIEs	13,169	$ 18,195	23,418	$ 25,403
Non-Consolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the Company's investment in VIEs	206,850		206,850		251,376
Consolidated VIEs
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the Company's investment in VIEs	190,316		190,316		175,620
Consolidated VIEs \| Consolidated Funds
Variable Interest Entity [Line Items]
Assets of consolidated VIEs	8,404,540		8,404,540		6,231,245
Liabilities of consolidated VIEs	$ 7,649,028		$ 7,649,028		$ 5,538,054