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STOCK BASED COMPENSATION PLANS - Summary of Grants (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognized equity based compensation expense $ (4,654) $ (4,075) $ (8,118) $ (7,214)
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted shares granted (in shares)     960,532  
Recognized equity based compensation expense $ (4,654) $ (4,050) $ (8,118) $ (7,140)
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options granted (in shares) 0 0 380,949 670,256
Weighted Average Fair Value of Options (in dollars) $ 0 $ 0 $ 1,356 $ 1,441
LP Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted shares granted (in shares)     0  
Recognized equity based compensation expense $ 0 $ (25) $ 0 $ (74)
Class A common stock | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted shares granted (in shares) 0 4,223 793,598 726,327
Weighted Average Fair Value (in dollars) $ 0 $ 75 $ 9,118 $ 13,353
Class A common stock | Restricted Dividends        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted shares granted (in shares) 0 0 166,934 0
Weighted Average Fair Value (in dollars) $ 0 $ 0 $ 1,908 $ 0