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SHARE-BASED COMPENSATION (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended 9 Months Ended 28 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
May 2010 share repurchase program
Sep. 30, 2012
May 2010 share repurchase program
Sep. 30, 2012
2012 Share Repurchase Program
May 30, 2012
2012 Share Repurchase Program
Maximum
Number of options              
Outstanding at the beginning of the period (in shares) 3,243,958            
Granted (in shares) 278,500 200,000          
Exercised (in shares) (221,615)            
Forfeited (in shares) (179,095)            
Outstanding at the end of the period (in shares) 3,121,748   3,243,958        
Exercisable at the end of the period (in shares) 1,936,789            
Weighted average exercise price              
Outstanding at the beginning of the period (in dollars per share) $ 14.19            
Granted (in dollars per share) $ 69.48 $ 33.15          
Exercised (in dollars per share) $ 13.00            
Forfeited (in dollars per share) $ 28.35            
Outstanding at the end of the period (in dollars per share) $ 18.28   $ 14.19        
Exercisable at the end of the period (in dollars per share) $ 11.28            
Weighted average contractual term (in years)              
Weighted average contractual term 6 years 3 months 18 days   6 years 8 months 12 days        
Exercisable at the end of the period 5 years 7 months 6 days            
Aggregate intrinsic value              
Outstanding at the beginning of the period (in dollars) $ 116,755            
Outstanding at the end of the period (in dollars) 212,188   116,755        
Exercisable at the end of the period (in dollars) $ 145,205            
Stock Repurchase Authorization              
Number of shares of common stock authorized to be purchased             3,500,000
Number of shares of common stock purchased       300,000 2,500,000    
Average purchase price per share (in dollars per share)       $ 63.25 $ 37.49    
Number of shares still available for purchase           3,500,000