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EQUITY-BASED COMPENSATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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        
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 20,000      
Share value authorized for repurchase $ 25,000      
Partnership units        
Equity-based compensation        
Units held by partners 33,803,921      
Unvested units held by partners 636,996      
Compensation expenses $ 3,730 $ 101,895 $ 48,539  
Unrecognized compensation expenses $ 6,067      
Weighted average period to recognize unrecognized compensation expense 2 years 2 months 12 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