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STOCK-BASED COMPENSATION (Details) (USD $)
6 Months Ended 96 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Weighted Average Grant Price [Roll Forward]        
Stock compensation expense $ 1,440,000 $ 954,000    
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights The shares of restricted stock granted to employees and that are outstanding as of June 30, 2013 vest in accordance with one of the following vesting schedules: 100% one year after date of grant; 33.3% each year for three years after date of grant; 20% each year for five years after the grant date; or 10% each year for ten years after the grant date.      
Numerator used for calculating the number of whole shares granted 75,000      
Award vesting period 1 year      
Number of shares authorized for grants (in shares) 800,000   800,000  
Number of shares granted (in shares) (92,536)   (780,907)  
Number of shares forfeited (in shares) 28,621   108,619  
Number of shares available for future grants (in shares) 127,712   127,712  
Weighted-average grant price of granted shares (in dollars per share) $ 50.29   $ 23.25  
Restricted Stock [Roll Forward]        
Non-vested, beginning balance (in shares) 210,330      
Granted (in shares) 92,536   780,907  
Forfeited (in shares) (28,621)   (108,619)  
Vested (in shares) (34,539)      
Nonvested, ending balance (in shares) 239,706   239,706  
Weighted Average Grant Price [Roll Forward]        
Non vested, beginning balance (in dollars per share) $ 26.85      
Granted (in dollars per share) $ 50.29   $ 23.25  
Forfeitures (in dollars per share) $ 37.36      
Vested (in dollars per share) $ 26.86      
Nonvested, ending balance (in dollars per share) $ 34.62   $ 34.62  
Stock compensation expense 1,400,000 1,000,000    
Related income tax benefits recognized 600,000 400,000    
Unrecognized compensation expense $ 6,800,000   $ 6,800,000 $ 4,600,000
Compensation cost not yet recognized, Period for recognition 32 months