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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jul. 02, 2017
Apr. 02, 2017
Dec. 31, 2016
Oct. 03, 2016
Jul. 02, 2016
Apr. 02, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total net sales $ 118,230 $ 104,817 $ 131,854 $ 167,355 $ 161,848 $ 161,427 $ 167,944 $ 173,109 $ 522,256 $ 664,328 $ 551,094
Gross profit 33,094 30,214 34,946 55,753 53,496 50,251 56,694 59,113 154,008 219,554 172,160
Net income $ 10,350 $ 9,370 $ 10,199 $ 22,224 $ 20,829 $ 19,850 $ 23,515 $ 23,278 $ 52,142 $ 87,472 $ 62,126
Basic earnings per share $ 0.59 $ 0.53 $ 0.58 $ 1.22 $ 1.11 $ 1.05 $ 1.24 $ 1.23 $ 2.94 $ 4.62 $ 3.32
Diluted earnings per share $ 0.59 $ 0.52 $ 0.57 $ 1.21 $ 1.10 $ 1.03 $ 1.22 $ 1.21 $ 2.91 $ 4.59 $ 3.21