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Summary Quarterly Financial Data (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	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales	$ 211,350	$ 223,780	$ 224,910	$ 217,100	$ 195,210	$ 209,330	$ 213,370	$ 199,830	$ 877,140	$ 817,740	$ 794,020
Gross Profit	57,240	61,720	64,780	60,380	49,210	58,890	59,470	51,820	244,120	219,390	210,800
Net income (loss)	$ 16,710	$ 22,670	$ 19,600	$ 24,320	$ (4,010)	$ 13,130	$ 14,850	$ 6,990	$ 83,300	$ 30,960	$ (39,800)
Basic earnings (loss) per share:
Net income (loss) per share	$ 0.37	$ 0.49	$ 0.43	$ 0.53	$ (0.09)	$ 0.29	$ 0.32	$ 0.15	$ 1.82	$ 0.68	$ (0.88)
Weighted average shares—basic	45,747,659	45,850,288	45,920,307	45,779,966	45,721,160	45,721,155	45,717,697	45,570,495	45,824,555	45,682,627	45,407,316
Diluted earnings (loss) per share:
Net income (loss) per share	$ 0.36	$ 0.49	$ 0.42	$ 0.53	$ (0.09)	$ 0.29	$ 0.32	$ 0.15	$ 1.80	$ 0.67	$ (0.88)
Weighted average shares—diluted	46,085,202	46,166,558	46,200,757	46,229,337	45,721,160	46,029,361	45,922,416	45,908,958	46,170,464	45,990,252	45,407,316

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