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Shareholders' Equity (Details) - Stock options [Member]
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Number of options  
Options outstanding, beginning balance | shares 679,552
Granted | shares
Exercised | shares (194,392)
Expired and forfeited | shares (7,450)
Options outstanding, ending balance | shares 477,710
Vested and expected to vest | shares 477,710
Exercisable at June 30, 2018 | shares 164,208
Weighted - average exercise price  
Options outstanding, beginning balance | $ / shares $ 13.20
Granted | $ / shares
Exercised | $ / shares 10.00
Expired and forfeited | $ / shares 18.47
Options outstanding, ending balance | $ / shares 14.43
Vested and expected to vest | $ / shares 14.43
Exercisable at June 30, 2018 | $ / shares $ 11.42
Weighted average remaining contractual term (in years)  
Outstanding, beginning balance 3 years 4 months 6 days
Outstanding, ending balance 3 years 2 months 12 days
Vested and expected to vest 3 years 2 months 12 days
Exercisable at June 30, 2018 2 years 4 months 24 days
Aggregate intrinsic value  
Outstanding, beginning balance | $ $ 4,517
Outstanding, ending balance | $ 2,554
Vested and expected to vest | $ 2,554
Exercisable at June 30, 2018 | $ $ 1,368