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Share Based Payments (Details 2) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Cash proceeds from stock options exercised $ 1,938 $ 625
Tax benefits 157 135
Intrinsic value of stock options exercised $ 1,775 $ 600