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EQUITY-BASED COMPENSATION (Schedule of Share-based Compensation Restricted Stock Units Award Activity) (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Shares    
Balance 1,742,920  
Granted 416,263  
Vested (648,052)  
Forfeited (47,500)  
Balance 1,463,631  
Weighted-Average Grant Date Fair Value    
Balance $ 8.14  
Granted $ 8.97 $ 7.56
Vested $ 8.99  
Forfeited $ 7.44  
Balance $ 8.03