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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total net sales	$ 121,121	$ 114,945	$ 128,411	$ 131,159	$ 118,230	$ 104,817	$ 131,854	$ 167,355	$ 495,635	$ 522,256	$ 664,328
Gross profit	33,848	28,092	36,599	35,820	33,094	30,214	34,946	55,753	134,358	154,008	219,554
Net income	$ 12,274	$ 9,206	$ 15,189	$ 14,264	$ 10,350	$ 9,370	$ 10,199	$ 22,224	$ 50,933	$ 52,142	$ 87,472
Basic earnings per share	$ 0.70	$ 0.53	$ 0.87	$ 0.82	$ 0.59	$ 0.53	$ 0.58	$ 1.22	$ 2.92	$ 2.94	$ 4.62
Diluted earnings per share	$ 0.69	$ 0.52	$ 0.86	$ 0.81	$ 0.59	$ 0.52	$ 0.57	$ 1.21	$ 2.88	$ 2.91	$ 4.59

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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