Select Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 70,314		$ 78,260	$ 77,959		$ 81,600	$ 89,530	$ 96,721	$ 103,461	$ 100,299	$ 308,133	$ 390,011	$ 383,292
Gross profit	15,120		16,131	16,935		17,724	20,718	21,077	22,439	21,704	65,910	85,938	84,659
Operating income (loss)	743	[1]	1,783	(234)	[2]	3,726	6,207	5,980	6,888	6,348	6,018	25,423	17,105
Net income (loss)	$ (199)	[1]	$ 676	$ (619)	[2]	$ 2,186	$ 3,668	$ 3,528	$ 4,031	$ 3,745	$ 2,044	$ 14,972	$ 7,902
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.01)	[1]	$ 0.04	$ (0.04)	[2]	$ 0.13	$ 0.21	$ 0.2	$ 0.23	$ 0.21	$ 0.12	$ 0.85	$ 0.44
Diluted (in dollars per share)	$ (0.01)	[1]	$ 0.04	$ (0.04)	[2]	$ 0.13	$ 0.21	$ 0.2	$ 0.23	$ 0.21	$ 0.12	$ 0.85	$ 0.44
Non-cash impairment charge	$ 423			$ 2,994							$ 3,400		$ 7,600

[1] During the fourth quarter of 2015, the Company recorded a non-cash impairment charge of $423. See Note 3 for additional information.

[2] During the second quarter of 2015, the Company recorded a non-cash impairment charge of $2,994. See Note 3 for additional information.