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Shareholders' Equity - Summary of Change in Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 02, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Shareholders Equity - Summary Of Change In Shareholders Equity Details          
Balance at the beginning of the period   $ 72,444 $ 79,783 $ 77,449 $ 82,569
Exercise of stock options, restricted stock and stock option cancelled   (113) 238 (225) 671
Stock repurchased $ 10,000 (1,094) (1,024) (4,151) (5,139)
Options repurchased   (1,752)
Proceeds from stock purchase plan   15 21 55 65
Dividends   (599) (449) (1,650) (1,373)
Share-based compensation   174 175 514 494
Tax benefit - stock option exercise   33 690
Unrealized gain or loss on investments, net of tax   10 (38) 68 179
Foreign currency translation adjustment   23 7 88 19
Net income/(loss) during the period   (9,276) 1,209 (10,564) 3,532
Balance at end of the period   $ 61,584 $ 79,955 $ 61,584 $ 79,955