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EQUITY-BASED COMPENSATION - Partnership Units and 2014 Omnibus Incentive Plan (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Apr. 30, 2014
Class A common stock      
Equity-based compensation      
Number of shares of common stock to be issued upon exchange of a partnership unit 1   1
Class A common stock | Share repurchase program authorized first quarter 2015      
Equity-based compensation      
Share value authorized for repurchase $ 25,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 20,000    
Partnership units      
Equity-based compensation      
Units held by partners 33,802,281    
Unvested units held by partners 627,780    
Compensation expenses $ 897 $ 1,066  
Unrecognized compensation expenses $ 5,255    
Weighted average period to recognize unrecognized compensation expense 2 years 1 month 6 days    
Managing Directors | Partnership units | Minimum      
Equity-based compensation      
Vesting period 5 years    
Managing Directors | Partnership units | Maximum      
Equity-based compensation      
Vesting period 8 years    
Non-managing director employees | Partnership units      
Equity-based compensation      
Vesting period 4 years