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SHAREHOLDERS' EQUITY (Schedule of Restricted Shares Units Activity) (Details) - RSU's [Member] - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of RSU's      
Outstanding as of beginning of year 1,009,184 773,200
Granted 818,856 359,643 783,700
Exercised (553,241) (86,847)
Forfeited (28,910) (36,812) (10,500)
Outstanding as of end of year 1,245,889 1,009,184 773,200
RSU exercisable as of end of year
Weighted Average Fair Value      
Outstanding as of beginning of year $ 14.62 $ 15.11
Granted 24.88 12.83 15.11
Exercised 14.71 11.45
Forfeited 16.42 14.73 15.15
Outstanding as of end of year 21.29 14.62 15.11
RSU's exercisable as of end of year