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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of options        
Outstanding at January 1, 2016 5,201,661 4,702,920 7,073,511  
Granted 2,772,300 1,562,000 1,239,375  
Exercised (139,400) (600,393) (3,058,966)  
Expired (416,523) (160,000)  
Forfeited (1,389,150) (302,866) (551,000)  
Outstanding at December 31, 2016 6,028,888 5,201,661 4,702,920 7,073,511
Exercisable at December 31, 2016 2,014,403 1,791,130 1,265,300  
Vested and expected to vest at December 31, 2016 5,475,668 4,878,629 4,320,142  
Weighted-average exercise price        
Outstanding at January 1, 2016 $ 16.51 $ 15.54 $ 11.74  
Granted 12.94 18.96 17.14  
Exercised 12.18 14.57 7.35  
Expired 17.06 16.92  
Forfeited 19.09 17.76 14.83  
Outstanding at December 31, 2016 14.33 16.51 15.54 $ 11.74
Exercisable at December 31, 2016 15.28 15.32 15.57  
Vested and expected to vest at December 31, 2016 $ 14.44 $ 16.44 $ 15.99  
Weighted- average remaining contractual term (in years)        
Outstanding 3 years 3 months 7 days 3 years 22 days 3 years 2 months 19 days 2 years 7 months 13 days
Exercisable at December 31, 2016 1 year 10 months 6 days 1 year 10 months 28 days 1 year 6 months 29 days  
Vested and expected to vest at December 31, 2016 3 years 1 month 28 days 2 years 11 months 27 days 3 years 1 month 21 days  
Aggregate intrinsic value        
Outstanding $ 5,070 $ 2,748 $ 30,474 $ 44,716
Exercisable at December 31, 2016 597 1,578 8,161  
Vested and expected to vest at December 31, 2016 $ 4,236 $ 2,655 $ 26,033