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GOODWILL AND INTANGIBLE ASSETS (Carrying Value of Intangible Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-lived intangible assets, net      
Intangible assets, gross $ 84,477 $ 109,106  
Less: accumulated amortization (52,899) (68,641)  
Intangible assets, net 31,578 40,465  
Fully-amortized intangibles, amount removed during the period 25,000    
General, administrative and other expense      
Finite-lived intangible assets, net      
Amortization expense $ 9,300 17,900 $ 26,600
Management contracts      
Finite-lived intangible assets, net      
Weighted average amortization period 2 years 9 months 18 days    
Intangible assets, gross $ 42,335 67,306  
Client relationships      
Finite-lived intangible assets, net      
Weighted average amortization period 9 years 6 months    
Intangible assets, gross $ 38,600 38,600  
Trade name      
Finite-lived intangible assets, net      
Weighted average amortization period 3 years 6 months    
Intangible assets, gross $ 3,200 3,200  
Other      
Finite-lived intangible assets, net      
Weighted average amortization period 1 year    
Intangible assets, gross $ 342 $ 0