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Summary of Unaudited Quarterly Results of Operations Summary of Unaudited Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 67,315 $ 70,199 $ 69,348 $ 69,711 $ 64,961 $ 70,243 $ 70,726 $ 69,904 $ 276,573 $ 275,834 $ 285,693
Gross profit 40,504 42,573 42,526 42,459 39,091 43,342 43,808 42,883 168,062 169,124 172,549
Net income (loss) $ (4,643) $ 1,825 $ 172 $ 1,017 $ (3,688) $ 2,430 $ 2,926 $ (1,371) $ (1,629) $ 297 $ (4,369)
Earnings Per Share, Basic $ (0.53) $ 0.21 $ 0.02 $ 0.12 $ (0.42) $ 0.28 $ 0.34 $ (0.16)      
Earnings Per Share, Diluted $ (0.53) $ 0.20 $ 0.02 $ 0.11 $ (0.42) $ 0.27 $ 0.33 $ (0.16)