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Share-Based Payments (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Cash proceeds from stock options exercised $ 542 $ 132
Tax benefits 135 0
Intrinsic value of stock options exercised $ 549 $ 80