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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Activity related to our stock options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Options      
Outstanding at the beginning of the period (in shares) 2,601,892    
Granted (in shares) 853,510 100,000 100,000
Exercised (in shares) (130,682)    
Forfeited (in shares) (161,595)    
Outstanding at the end of the period (in shares) 3,163,125 2,601,892  
Exercisable at the end of the period (in shares) 2,214,051    
Weighted average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 21.21    
Granted (in dollars per share) 24.21 $ 84.61 $ 104.84
Exercised (in dollars per share) 10.64    
Forfeited (in dollars per share) 66.72    
Outstanding at the end of the period (in dollars per share) 20.13 $ 21.21  
Exercisable at the end of the period (in dollars per share) $ 14.43    
Weighted average contractual term      
Weighted average contractual term 4 years 11 months 9 days 4 years 5 months 8 days  
Exercisable at the end of the period 3 years 1 month 13 days    
Aggregate intrinsic value      
Aggregate intrinsic value (in dollars) $ 35,842 $ 47,805  
Exercisable at the end of the period (in dollars) $ 32,395