Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 123,157	$ 78,532	$ 249,961	$ 194,745
Cost of sales (exclusive of depreciation and amortization shown separately below)	99,797	65,058	199,485	159,536
Selling, general, and administrative expense	13,585	14,273	28,160	30,433
Depreciation and amortization	11,687	11,327	23,255	22,684
Goodwill impairment	0	0	0	92,942
Other operating expense (income), net	(324)	(949)	(329)	4,177
Loss from operations	(1,588)	(11,177)	(610)	(115,027)
Interest expense	3,573	6,356	5,597	10,163
Loss on extinguishment of debt and write-off of debt issuance costs	0	0	2,390	0
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	1,680	(1,215)	1,558	329
Loss from continuing operations before benefit (provision) for income taxes and share of net income from joint venture	(6,841)	(16,318)	(13,905)	(125,519)
Benefit (provision) for income taxes	231	(2,175)	987	(780)
Share of net income from joint venture	1,219	927	2,614	656
Loss from continuing operations	(5,391)	(17,566)	(10,304)	(125,643)
Loss from discontinued operations, net of tax (Note 2)	0	(4,182)	0	(144,296)
Net loss	(5,391)	(21,748)	(10,304)	(269,939)
Other comprehensive income (loss):
Foreign currency translation gain (loss)	4,409	994	1,062	(13,348)
Change in fair value, net of tax	0	(1,255)	0	(12,464)
Reclassification adjustment for losses included in net loss, net of tax	0	2,638	2,851	3,690
Other comprehensive income (loss)	4,409	2,377	3,913	(22,122)
Comprehensive loss	$ (982)	$ (19,371)	$ (6,391)	$ (292,061)
Basic net loss per common share:
Loss from continuing operations per common share (in dollars per share)	$ (0.17)	$ (0.49)	$ (0.62)	$ (3.12)
Loss from discontinued operations per common share (in dollars per share)	0	(0.10)	0	(3.43)
Net loss per common share (in dollars per shares)	$ (0.17)	$ (0.59)	$ (0.62)	$ (6.55)
Weighted average common shares outstanding, basic (in shares)	44,440	42,197	43,561	42,154
Diluted net loss per common share:
Loss from continuing operations per common share (in dollars per share)	$ (0.17)	$ (0.49)	$ (0.62)	$ (3.12)
Loss from discontinued operations per common share (in dollars per share)	0	(0.10)	0	(3.43)
Net loss per common share (in dollars per share)	$ (0.17)	$ (0.59)	$ (0.62)	$ (6.55)
Weighted average common shares outstanding, diluted (in shares)	44,440	42,197	43,561	42,154