Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 110,549			$ 149,508			$ 369,692	$ 407,216
Cost of sales	86,801			118,562			285,650	321,061
Gross profit	23,748			30,946			84,042	86,155
Selling, general and administrative expenses	25,830			26,162			74,078	77,385
Amortization of intangible assets	323			345			971	1,036
Operating (loss) profit	(2,405)			4,439			8,993	7,734
Interest expense, net	339			756			1,308	2,208
Other expense (income), net	92			681			1,601	352
Income (loss) from continuing operations before income taxes	(2,836)			3,002			6,084	5,174
Income tax expense (benefit)	(826)			2,449			1,383	3,385
Net income (loss) from continuing operations	(2,010)			553			4,701	1,789
Income (loss) from discontinued operations, net of tax	0			(2,753)			22,561	(7,992)
Net income (loss)	$ (2,010)	$ 7,760	$ 21,512	$ (2,200)	$ (618)	$ (3,385)	$ 27,262	$ (6,203)
Basic and diluted earnings (loss) per share:
Continuing operations (in dollars per share)	$ (0.15)			$ 0.04			$ 0.34	$ 0.13
Discontinued operations (in dollars per share)	0			(0.20)			1.65	(0.58)
Basic and diluted earnings (loss) per share (in dollars per share)	$ (0.15)			$ (0.16)			$ 1.99	$ (0.45)
Basic weighted average shares outstanding (in shares)	13,670			13,579			13,646	13,726
Diluted weighted average shares outstanding (in shares)	13,686			13,595			13,667	13,731