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SHAREHOLDERS' EQUITY (Summary of Stock Option Activity) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Number of options    
Outstanding at January 1, 2015 4,702,920  
Granted 1,562,000  
Exercised (600,393)  
Expired (160,000)  
Forfeited (302,866)  
Outstanding at December 31, 2015 5,201,661 4,702,920
Exercisable at December 31, 2015 1,791,130  
Vested and expected to vest at December 31, 2015 4,878,629  
Weighted-average exercise price    
Outstanding at January 1, 2015 $ 15.54  
Granted 18.96  
Exercised 14.57  
Expired 16.92  
Forfeited 17.76  
Outstanding at December 31, 2015 16.51 $ 15.54
Exercisable at December 31, 2015 15.32  
Vested and expected to vest at December 31, 2015 $ 16.44  
Weighted- average remaining contractual term (in years)    
Outstanding 3 years 22 days 3 years 2 months 19 days
Exercisable at December 31, 2015 1 year 10 months 28 days  
Vested and expected to vest at December 31, 2015 2 years 11 months 27 days  
Aggregate intrinsic value    
Outstanding $ 2,748 $ 30,474
Exercisable at December 31, 2015 1,578  
Vested and expected to vest at December 31, 2015 $ 2,655