Summary Quarterly Financial Data (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
Net sales	$ 170,920	$ 188,410	$ 190,830	$ 173,370	$ 170,090	$ 182,100	$ 181,690	$ 171,150	$ 723,530	$ 705,030	$ 656,160
Gross Profit	44,330	48,990	53,790	46,790	47,670	51,570	53,020	47,850	193,900	200,110	189,280
Income from continuing operations	13,430	15,240	18,720	14,550	14,940	20,930	17,280	20,560	61,940	73,710	35,960
Income (loss) from discontinued operations, net of income taxes	24,970	3,870	3,300	4,540	1,770	1,740	2,320	3,760	36,680	9,590	(5,000)
Net income	$ 38,400	$ 19,110	$ 22,020	$ 19,090	$ 16,710	$ 22,670	$ 19,600	$ 24,320	$ 98,620	$ 83,300	$ 30,960
Basic earnings (loss) per share:
Continuing operations	$ 0.30	$ 0.34	$ 0.41	$ 0.32	$ 0.33	$ 0.45	$ 0.38	$ 0.45	$ 1.37	$ 1.61	$ 0.79
Discontinued operations	0.56	0.08	0.07	0.10	0.04	0.04	0.05	0.08	0.81	0.21	(0.11)
Net income per share	$ 0.86	$ 0.42	$ 0.48	$ 0.42	$ 0.37	$ 0.49	$ 0.43	$ 0.53	$ 2.18	$ 1.82	$ 0.68
Weighted average shares—basic	44,868,503	45,175,244	45,592,075	45,578,815	45,747,659	45,850,288	45,920,307	45,779,966	45,303,659	45,824,555	45,682,627
Diluted earnings (loss) per share:
Continuing operations	$ 0.30	$ 0.34	$ 0.41	$ 0.32	$ 0.32	$ 0.46	$ 0.37	$ 0.45	$ 1.36	$ 1.60	$ 0.78
Discontinued operations	0.55	0.08	0.07	0.10	0.04	0.03	0.05	0.08	0.80	0.20	(0.11)
Net income per share	$ 0.85	$ 0.42	$ 0.48	$ 0.42	$ 0.36	$ 0.49	$ 0.42	$ 0.53	$ 2.16	$ 1.80	$ 0.67
Weighted average shares—diluted	45,144,353	45,415,767	45,828,315	45,992,182	46,085,202	46,166,558	46,200,757	46,229,337	45,595,154	46,170,464	45,990,252