Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 113,761	$ 120,459	$ 308,506	$ 378,838
Cost of sales (exclusive of depreciation and amortization shown separately below)	90,076	96,654	249,612	300,666
Selling, general and administrative expense	13,745	15,493	44,178	52,994
Depreciation and amortization	11,435	11,284	34,119	33,552
Restructuring and integration expense, net	0	0	0	(12)
Goodwill impairment	0	0	92,942	0
Other operating expense (income), net	(39)	(1,161)	4,138	(905)
Loss from operations	(1,456)	(1,811)	(116,483)	(7,457)
Interest expense	6,873	3,805	17,036	8,829
Loss on extinguishment of debt and write-off of debt issuance costs	144	0	144	308
Other expense (income), net	(262)	633	67	863
Loss from continuing operations before benefit (provision) for income taxes and share of net income from joint venture	(8,211)	(6,249)	(133,730)	(17,457)
Benefit (provision) for income taxes	8,715	1,134	7,935	(3,694)
Share of net income from joint venture	1,136	279	1,792	345
Income (loss) from continuing operations	1,640	(4,836)	(124,003)	(20,806)
Income (loss) from discontinued operations, net of tax (Note 2)	20,330	(1,019)	(123,966)	(11,850)
Net income (loss)	21,970	(5,855)	(247,969)	(32,656)
Other comprehensive income (loss):
Foreign currency translation gain (loss)	6,712	(11,178)	(6,636)	(11,354)
Change in fair value, net of tax	21	(1,181)	(12,443)	(11,999)
Reclassification adjustment for losses included in net income (loss), net of tax	3,148	238	6,838	238
Other comprehensive income (loss)	9,881	(12,121)	(12,241)	(23,115)
Comprehensive income (loss)	$ 31,851	$ (17,976)	$ (260,210)	$ (55,771)
Basic net income (loss) per common share:
Income (loss) from continuing operations per common share (in dollars per share)	$ (0.04)	$ (0.12)	$ (3.16)	$ (0.50)
Income (loss) from discontinued operations per common share (in dollars per share)	0.49	(0.02)	(2.94)	(0.28)
Net income (loss) per common share (in dollars per shares)	$ 0.45	$ (0.14)	$ (6.10)	$ (0.78)
Weighted average common shares outstanding (in shares)	42,202	42,038	42,170	42,013
Diluted net income (loss) per common share:
Income (loss) from continuing operations per common share (in dollars per share)	$ (0.04)	$ (0.12)	$ (3.16)	$ (0.50)
Income (loss) from discontinued operations per common share (in dollars per share)	0.49	(0.02)	(2.94)	(0.28)
Net income (loss) per common share (in dollars per share)	$ 0.45	$ (0.14)	$ (6.10)	$ (0.78)
Weighted average common shares outstanding (in shares)	42,202	42,038	42,170	42,013