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EQUITY-BASED COMPENSATION (Schedule of Share-based Compensation Restricted Stock Units Award Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares      
Balance 1,742,920    
Granted 977,249    
Vested (893,747)    
Forfeited (61,750)    
Balance 1,764,672 1,742,920  
Weighted-Average Grant Date Fair Value      
Balance $ 8.14    
Granted $ 9.41 $ 7.92 $ 7.5
Vested $ 8.85    
Forfeited $ 7.65    
Balance $ 8.5 $ 8.14  
Estimated forfeiture rate 3.00%    
Aggregate fair value of unvested restricted stock $ 11,700    
Aggregate fair value of stock vested $ 8,100 $ 5,500 $ 6,800
Weighted-average recognition period for unvested restricted stock 2 years