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CONSOLIDATION (Variable Interest Entities) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Variable Interest Entity [Line Items]          
Assets of consolidated VIEs $ 6,244,449   $ 6,244,449   $ 5,829,712
Liabilities of consolidated VIEs 4,995,976   4,995,976   4,452,450
Consolidated Funds          
Variable Interest Entity [Line Items]          
Net income (loss) attributable to non-controlling interests related to consolidated VIEs (8,647) $ 1,054 7,208 $ (10,925)  
Non-Consolidated Variable Interest Entities          
Variable Interest Entity [Line Items]          
Maximum exposure to loss attributable to the Company's investment in VIEs 371,688   371,688   268,950
Consolidated VIEs          
Variable Interest Entity [Line Items]          
Maximum exposure to loss attributable to the Company's investment in VIEs 140,478   140,478   153,746
Consolidated VIEs | Consolidated Funds          
Variable Interest Entity [Line Items]          
Assets of consolidated VIEs 3,936,175   3,936,175   3,822,010
Liabilities of consolidated VIEs $ 3,471,917   $ 3,471,917   $ 3,360,329