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EQUITY STRUCTURE AND ACCOUNTS - Schedule of Repurchase of Treasury Stock Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Treasury Stock [Roll Forward]    
Repurchases paid $ (1,206)  
2014 Share Repurchase Authorization Program    
Treasury Stock [Roll Forward]    
Remaining amount available for repurchase $ 39,900  
2014 Share Repurchase Authorization Program | Class A Common Stock    
Class of Stock [Line Items]    
Purchase of treasury stock (in shares) 146,153 0
Treasury Stock [Roll Forward]    
Remaining amount available for repurchase $ 41,132 $ 41,769
Additional authorizations 0 0
Repurchases paid (1,201) 0
Repurchases unsettled 0 0
Remaining amount available for repurchase $ 39,931 $ 41,769