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GOODWILL AND INTANGIBLE ASSETS (Carrying Value of Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Finite-lived intangible assets, net            
Intangible assets $ 84,376     $ 84,376   $ 109,106
Less: accumulated amortization (51,620)     (51,620)   (68,641)
Intangible assets, net 32,756     32,756   40,465
Fully-amortized intangibles, amount removed during the period   $ 25,000        
General, administrative and other expense            
Finite-lived intangible assets, net            
Amortization expense 1,300   $ 3,700 $ 8,000 $ 14,200  
Management contracts            
Finite-lived intangible assets, net            
Weighted average amortization period (less than for other)       2 years 10 months 24 days    
Intangible assets 42,334     $ 42,334   67,306
Client relationships            
Finite-lived intangible assets, net            
Weighted average amortization period (less than for other)       9 years 9 months 18 days    
Intangible assets 38,600     $ 38,600   38,600
Trade name            
Finite-lived intangible assets, net            
Weighted average amortization period (less than for other)       3 years 9 months 18 days    
Intangible assets 3,200     $ 3,200   3,200
Other            
Finite-lived intangible assets, net            
Weighted average amortization period (less than for other)       1 year    
Intangible assets $ 242     $ 242   $ 0