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GOODWILL AND INTANGIBLE ASSETS (Carrying Value of Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-lived intangible assets, net          
Intangible assets $ 19,217   $ 19,217 $ 84,135  
Less: accumulated amortization (11,242)   (11,242) (52,701)  
Intangible assets, net 7,975   7,975 31,434  
Amortization expense         $ 17,900
Fully-amortized intangibles, amount removed during the period   $ 29,800      
Removal of intangible assets 35,100        
General, administrative and other expense          
Finite-lived intangible assets, net          
Amortization expense     3,400 9,000  
Non-cash impairment charge     $ 20,000    
Management contracts          
Finite-lived intangible assets, net          
Estimated useful lives, intangible assets     2 years 2 months 12 days    
Intangible assets 12,498   $ 12,498 42,335  
Client relationships          
Finite-lived intangible assets, net          
Estimated useful lives, intangible assets     8 years 6 months    
Intangible assets 6,341   $ 6,341 38,600  
Trade name          
Finite-lived intangible assets, net          
Estimated useful lives, intangible assets     2 years 6 months    
Intangible assets $ 378   $ 378 $ 3,200