Summary Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 195,210	$ 209,330	$ 213,370	$ 199,830	$ 185,530	$ 202,290	$ 203,320	$ 202,880	$ 817,740	$ 794,020	$ 863,980
Gross Profit	49,140	58,830	59,410	51,760	39,430	58,050	57,080	55,920	219,140	210,480	236,110
Net income (loss)	$ (4,010)	$ 13,130	$ 14,850	$ 6,990	$ (67,360)	$ 8,780	$ 10,480	$ 8,300	$ 30,960	$ (39,800)	$ (33,400)
Basic earnings (loss) per share:
Net income (loss) per share	$ (0.09)	$ 0.29	$ 0.32	$ 0.15	$ (1.48)	$ 0.19	$ 0.23	$ 0.18	$ 0.68	$ (0.88)	$ (0.74)
Weighted average shares—basic	45,721,160	45,721,155	45,717,697	45,570,495	45,484,485	45,435,936	45,429,851	45,278,990	45,682,627	45,407,316	45,123,626
Diluted earnings (loss) per share:
Net income (loss) per share	$ (0.09)	$ 0.29	$ 0.32	$ 0.15	$ (1.48)	$ 0.19	$ 0.23	$ 0.18	$ 0.67	$ (0.88)	$ (0.74)
Weighted average shares—diluted	45,721,160	46,029,361	45,922,416	45,908,958	45,484,485	45,760,455	45,726,348	45,654,816	45,990,252	45,407,316	45,123,626
Impairment of goodwill and indefinite-lived intangible assets					$ 98,900				$ 0	$ 98,900	$ 75,680