Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 117,244	$ 113,761	$ 367,205	$ 308,506
Cost of sales (exclusive of depreciation and amortization shown separately below)	98,642	90,076	298,127	249,612
Selling, general, and administrative expense	12,181	13,745	40,341	44,178
Depreciation and amortization	11,605	11,435	34,860	34,119
Goodwill impairment	0	0	0	92,942
Other operating expense (income), net	(572)	(39)	(901)	4,138
Loss from operations	(4,612)	(1,456)	(5,222)	(116,483)
Interest expense	3,578	6,873	9,175	17,036
Loss on extinguishment of debt and write-off of debt issuance costs	0	144	2,390	144
Derivative payments on interest rate swap	0	0	1,717	0
Loss on interest rate swap	0	0	2,033	0
Other expense (income), net	(4,346)	(262)	(2,788)	67
Loss from continuing operations before benefit (provision) for income taxes and share of net income from joint venture	(3,844)	(8,211)	(17,749)	(133,730)
Benefit (provision) for income taxes	(375)	8,715	612	7,935
Share of net income from joint venture	842	1,136	3,456	1,792
Income (loss) from continuing operations	(3,377)	1,640	(13,681)	(124,003)
Income (loss) from discontinued operations, net of tax (Note 2)	0	20,330	0	(123,966)
Net income (loss)	(3,377)	21,970	(13,681)	(247,969)
Other comprehensive income (loss):
Foreign currency translation gain (loss)	(2,612)	6,712	(1,550)	(6,636)
Change in fair value, net of tax	(176)	21	(176)	(12,443)
Reclassification adjustment for losses included in net income (loss), net of tax	22	3,148	2,873	6,838
Other comprehensive income (loss)	(2,766)	9,881	1,147	(12,241)
Comprehensive income (loss)	$ (6,143)	$ 31,851	$ (12,534)	$ (260,210)
Basic net income (loss) per common share:
Loss from continuing operations per common share (in dollars per share)	$ (0.13)	$ (0.04)	$ (0.75)	$ (3.16)
Loss from discontinued operations per common share (in dollars per share)	0	0.49	0	(2.94)
Net loss per common share (in dollars per shares)	$ (0.13)	$ 0.45	$ (0.75)	$ (6.10)
Weighted average common shares outstanding, basic (in shares)	44,455	42,202	43,862	42,170
Diluted net income (loss) per common share:
Loss from continuing operations per common share (in dollars per share)	$ (0.13)	$ (0.04)	$ (0.75)	$ (3.16)
Loss from discontinued operations per common share (in dollars per share)	0	0.49	0	(2.94)
Net loss per common share (in dollars per share)	$ (0.13)	$ 0.45	$ (0.75)	$ (6.10)
Weighted average common shares outstanding, diluted (in shares)	44,455	42,202	43,862	42,170