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STOCK-BASED AWARDS (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock-Based Awards        
Total stock-based compensation expense (in dollars) $ 816 $ 830 $ 1,568 $ 1,643
Stock options
       
Stock-Based Awards        
Total stock-based compensation expense (in dollars)   1   3
Restricted stock awards
       
Stock-Based Awards        
Total stock-based compensation expense (in dollars) $ 816 $ 829 $ 1,568 $ 1,640
Vesting period     3 years  
Units        
Outstanding-beginning of year (in shares)     1,003,000  
Granted at fair value (in shares) 32,500   272,500  
Vested (in shares)     (334,000)  
Forfeited (in shares)     (191,000)  
Outstanding-end of period (in shares) 751,000   751,000  
Weighted Average Grant Date Fair Value        
Outstanding-beginning of year (in dollars per share)     $ 8.81  
Granted at fair value (in dollars per share) $ 25.45   $ 15.96  
Vested (in dollars per share)     $ 10.14  
Forfeited (in dollars per share)     $ 9.41  
Outstanding-end of period (in dollars per share) $ 10.66   $ 10.66  
Restricted stock awards | First year
       
Stock-Based Awards        
Percentage of award vesting at the end of the year     40.00%  
Restricted stock awards | Second year
       
Stock-Based Awards        
Percentage of award vesting at the end of the year     30.00%  
Restricted stock awards | Third year
       
Stock-Based Awards        
Percentage of award vesting at the end of the year     30.00%