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SHARE-BASED COMPENSATION (Details) (USD $)
 9 Months Ended 1 Months Ended 117 Months Ended
Sep. 30, 2014
Restricted Stock Units
Jan. 31, 2014
Stock Options
Sep. 30, 2014
Stock Options
Dec. 31, 2013
Stock Options
Sep. 30, 2014
SARs
Award activity          
Outstanding at the beginning of the period (in shares) 1,443,460        
Granted (in shares) 216,450        
Vested (in shares) (219,351)        
Forfeited (in shares) (33,548)        
Outstanding at the end of the period (in shares) 1,407,011        
Granted to date (in shares)         0
Weighted-Average Grant Date Fair Value          
Granted (in dollars per share) $ 39.86        
Stock options activity          
Stock options outstanding (in shares)       35,730  
Weighted average exercise price (in dollars per share)       $ 29.10  
Exercised (in shares)   35,530      
Forfeited (in shares)   200      
Granted (in shares)     0