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CONSOLIDATION (Variable Interest Entities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets of consolidated VIEs	$ 10,144,735		$ 10,144,735		$ 8,563,522
Liabilities of consolidated VIEs	8,609,486		8,609,486		7,103,230
Consolidated Funds
Variable Interest Entity [Line Items]
Net income (loss) attributable to non-controlling interests related to consolidated VIEs	9,882	$ (8,647)	10,249	$ 7,208
Non-Consolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the Company's investment in VIEs	241,231		241,231		251,376
Consolidated VIEs
Variable Interest Entity [Line Items]
Maximum exposure to loss attributable to the Company's investment in VIEs	190,400		190,400		175,620
Consolidated VIEs \| Consolidated Funds
Variable Interest Entity [Line Items]
Assets of consolidated VIEs	8,059,640		8,059,640		6,231,245
Liabilities of consolidated VIEs	$ 7,302,896		$ 7,302,896		$ 5,538,054