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Shareholders' Equity - Summary of Change in Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Shareholders Equity - Summary Of Change In Shareholders Equity Details        
Balance at the beginning of the period $ 79,783 $ 78,665 $ 82,569 $ 76,016
Exercise of stock options 238 62 671 152
Stock repurchased (1,024) (5,139)
Options repurchased (1,752)
Proceeds from stock purchase plan 21 40 65 40
Dividends (449) (1,373) (639)
Share-based compensation 175 193 494 648
Tax benefit - stock option exercises 33 20 690 49
Unrealized gain or loss on investments, net of tax (38) 17 179 (5)
Foreign currency translation adjustment 7 (8) 19 (59)
Net Income during the period 1,209 2,417 3,532 5,204
Balance at end of the period $ 79,955 $ 81,406 $ 79,955 $ 81,406