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SELECTED STATEMENTS OF OPERATIONS DATA (Schedule Of Net income per share) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:      
Numerator for basic and diluted net income per share - income available to shareholders of Ordinary shares $ 15,560 $ 11,429 $ 1,011
Denominator:      
Denominator for basic net income per share - weighted average number of shares 77,916,912 77,702,788 77,239,409
Effect of dilutive securities:      
Employee stock options and RSU $ 2,025,441 $ 910,740 $ 57,272
Denominator for diluted net income per share - adjusted weighted average number of shares 79,942,353 78,613,528 77,296,681