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EQUITY-BASED COMPENSATION (Schedule of Share-based Compensation Restricted Stock Units Award Activity) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Shares    
Balance 1,764,672  
Granted 548,573  
Vested/released (334,902)  
Forfeited (54,165)  
Balance 1,924,178  
Weighted-Average Grant Date Fair Value    
Balance $ 8.50  
Granted $ 10.92 $ 9.08
Vested/released $ 8.51  
Forfeited $ 8.18  
Balance $ 9.20