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STOCK BASED COMPENSATION PLANS - Summary of Grants (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Recognized equity based compensation expense $ (3,464) $ (3,139)
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 $ (3,464) $ (3,089)
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options granted (in shares) 380,949 670,256
Weighted Average Fair Value of Options (in dollars) $ 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 $ (50)
Class A common stock | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted shares granted (in shares) 793,598 722,104
Weighted Average Fair Value (in dollars) $ 9,118 $ 13,278
Class A common stock | Restricted Dividends    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted shares granted (in shares) 166,934 0
Weighted Average Fair Value (in dollars) $ 1,908 $ 0