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Shareholders' Equity - Summary of Change in Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 02, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Shareholders Equity - Summary Of Change In Shareholders Equity Details          
Balance at the beginning of the period   $ 75,863 $ 82,505 $ 77,449 $ 82,569
Exercise of stock options   35 140 44 433
Stock repurchased $ 10,000 (2,282) (3,711) (3,210) (4,115)
Options repurchased   (1,752)
Proceeds from stock purchase plan   19 18 38 43
Dividends   (612) (465) (1,051) (924)
Share-based compensation   169 171 340 319
Tax benefit - stock option exercises   93 656
Unrealized gain or loss on investments, net of tax   20 97 58 218
Foreign currency translation adjustment   52 (20) 64 13
Net income/(loss) during the period   (820) 955 (1,288) 2,323
Balance at end of the period   $ 72,444 $ 79,783 $ 72,444 $ 79,783