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SHAREHOLDERS' EQUITY (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of options    
Outstanding at December 31, 2019 28,286,653  
Stock Options [Member]    
Number of options    
Outstanding at January 1, 2019 4,855,203  
Granted 1,207,866  
Exercised (1,250,680)  
Expired (2,875)  
Forfeited (511,235)  
Outstanding at December 31, 2019 4,298,279 4,855,203
Exercisable at December 31, 2019 1,185,612  
Vested and expected to vest at December 31, 2019 3,980,155  
Weighted-average exercise price    
Outstanding at January 1, 2019 $ 16.96  
Granted 24.05  
Exercised 14.43  
Expired 16.43  
Forfeited 18.24  
Outstanding at December 31, 2019 19.54 $ 16.96
Exercisable at December 31, 2019 15.42  
Vested and expected to vest at December 31, 2019 $ 19.27  
Weighted- average remaining contractual term (in years)    
Outstanding 3 years 1 month 13 days 3 years 3 months 18 days
Exercisable at December 31, 2019 1 year 10 months 28 days  
Vested and expected to vest at December 31, 2019 3 years 14 days  
Aggregate intrinsic value    
Outstanding at January 1, 2019 $ 29,774  
Outstanding at December 31, 2019 27,514 $ 29,774
Exercisable at December 31, 2019 12,361  
Vested and expected to vest at December 31, 2019 $ 26,549