Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales	$ 427,534	$ 489,514	$ 524,194
Cost of sales (exclusive of depreciation and amortization shown separately below)	343,594	392,482	413,394
Selling, general, and administrative expense	58,055	68,895	72,764
Depreciation and amortization	45,680	44,896	43,026
Restructuring and integration expense, net	0	(12)	689
Goodwill impairment	92,942	0	182,542
Other operating expense, net	4,720	846	6,826
Loss from operations	(117,457)	(17,593)	(195,047)
Interest expense	18,898	13,030	11,315
Loss on extinguishment of debt and write-off of debt issuance costs	144	540	0
Derivative payments on interest rate swap	4,133	0	0
Loss on interest rate swap	11,669	0	0
Other expense (income), net	(213)	962	2,016
Loss from continuing operations before benefit (provision) for income taxes and share of net income (loss) from joint venture	(152,088)	(32,125)	(208,378)
Benefit (provision) for income taxes	8,972	(305)	1,548
Share of net income (loss) from joint venture	3,626	1,681	(14,390)
Loss from continuing operations	(139,490)	(30,749)	(221,220)
Income (loss) from discontinued operations, net of tax (Note 2)	38,898	(15,992)	(41,767)
Net loss	(100,592)	(46,741)	(262,987)
Other comprehensive income (loss):
Reclassification adjustment for discontinued operations	5,961	0	0
Foreign currency translation loss	(1,683)	(3,845)	(13,609)
Change in fair value, net of tax	(12,443)	(10,479)	0
Reclassification adjustment for losses included in net loss, net of tax	18,987	1,084	0
Other comprehensive income (loss)	10,822	(13,240)	(13,609)
Comprehensive loss	$ (89,770)	$ (59,981)	$ (276,596)
Basic net loss per common share:
Loss from continuing operations per common share (in usd per share)	$ (3.60)	$ (0.75)	$ (6.98)
Income (loss) from discontinued operations per common share (in usd per share)	0.92	(0.38)	(1.32)
Net loss per common share (in usd per share)	$ (2.68)	$ (1.13)	$ (8.30)
Weighted average common shares outstanding (in shares)	42,199	42,030	31,678
Diluted net loss per common share:
Diluted loss from continuing operations per common share (in usd per share)	$ (3.60)	$ (0.75)	$ (6.98)
Income (loss) from discontinued operations per common share (in usd per share)	0.92	(0.38)	(1.32)
Net loss per common share (in usd per share)	$ (2.68)	$ (1.13)	$ (8.30)
Weighted average common shares outstanding (in shares)	42,199	42,030	31,678