Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 138,297		$ 131,065		$ 259,143	$ 257,707
Cost of sales	103,043		102,558		198,849	202,498
Gross profit	35,254		28,507		60,294	55,209
Selling, general and administrative expenses	24,035		24,976		48,248	51,222
Amortization of intangible assets	324		346		648	691
Operating profit	10,895		3,185		11,398	3,296
Interest expense, net	366		789		969	1,452
Other expense (income), net	(193)		(132)		1,509	(329)
Income (loss) from continuing operations before income taxes	10,722		2,528		8,920	2,173
Income tax expense (benefit)	2,657		630		2,209	937
Net income (loss) from continuing operations	8,065		1,898		6,711	1,236
Income (loss) from discontinued operations, net of tax	(305)		(2,516)		22,561	(5,239)
Net income (loss)	$ 7,760	$ 21,512	$ (618)	$ (3,385)	$ 29,272	$ (4,003)
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted earnings (loss) per share, continuing operations (in usd per share)	$ 0.59		$ 0.14		$ 0.49	$ 0.09
Basic and diluted earnings (loss) per share, discontinued operations (in usd per share)	(0.02)		(0.18)		1.65	(0.38)
Basic and diluted earnings (loss) per share (in usd per share)	$ 0.57		$ (0.04)		$ 2.14	$ (0.29)
Basic weighted average shares outstanding (in shares)	13,644,000		13,813,000		13,635,000	13,800,000
Diluted weighted average shares outstanding (in shares)	13,670,000		13,826,000		13,657,000	13,813,000