Summarized Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 116,818	$ 125,480	$ 134,285	$ 139,115	$ 138,388	$ 135,219	$ 140,560	$ 152,568	$ 515,698	$ 566,735	$ 547,043
Gross profit	39,231	39,586	46,936	45,559	42,096	42,091	47,991	47,115	171,312	179,293	157,453
Operating income (loss)	8,806	8,060	10,182	10,218	7,033	(25,839)	13,111	12,022	37,266	6,327	24,888
Income (loss) from continuing operations	5,747	5,219	6,606	6,643	3,126	(21,137)	8,608	7,755	24,215	(1,648)	10,844
Income (loss) from discontinued operations, net of income tax	(9)	0	0	127	(788)	(2)	0	(911)	118	(1,701)	(20,733)
Net income (loss)	$ 5,738	$ 5,219	$ 6,606	$ 6,770	$ 2,338	$ (21,139)	$ 8,608	$ 6,844	$ 24,333	$ (3,349)	$ (9,889)
Basic (in dollars per share)	$ 0.16	$ 0.15	$ 0.19	$ 0.19	$ 0.09	$ (0.60)	$ 0.26	$ 0.25	$ 0.68	$ (0.05)	$ 0.36
Diluted (in dollars per share)	0.16	0.15	0.18	0.19	0.09	(0.60)	0.26	0.25	0.68	(0.05)
Basic (in dollars per share)	0	0	0	0	(0.02)	0	0	(0.03)	0	(0.05)	(0.69)
Diluted (in dollars per share)	0	0	0	0	(0.02)	0	0	(0.03)	0	(0.05)	(0.68)
Basic (in dollars per share)	0.16	0.15	0.19	0.19	0.07	(0.60)	0.26	0.22	0.68	(0.10)	(0.33)
Diluted (in dollars per share)	$ 0.16	$ 0.15	$ 0.18	$ 0.19	$ 0.07	$ (0.60)	$ 0.26	$ 0.22	$ 0.68	$ (0.10)	$ (0.33)