Selected Quarterly Financial Data (Unaudited) (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	$ 204,094	$ 184,792	$ 193,433	$ 181,201	$ 191,017	$ 169,184	$ 181,027	$ 177,940	$ 763,520	$ 719,168	$ 740,055
Gross profit	106,959	101,209	102,422	97,740	102,376	93,546	93,498	92,282	408,330	381,702	404,057
Net income	$ 6,708	$ 7,337	$ 2,884	$ (2,265)	$ 7,852	$ 8,873	$ 7,461	$ 6,312	$ 14,664	$ 30,498	$ 32,192
EPS:
Basic (in dollars per share)	$ 0.24	$ 0.26	$ 0.10	$ (0.08)	$ 0.28	$ 0.32	$ 0.27	$ 0.23	$ 0.53	$ 1.10	$ 1.17
Diluted (in dollars per share)	$ 0.24	$ 0.26	$ 0.10	$ (0.08)	$ 0.28	$ 0.32	$ 0.27	$ 0.23	$ 0.52	$ 1.09	$ 1.16