Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 150,420	$ 221,666	$ 350,165	$ 434,922
Cost of sales (exclusive of depreciation and amortization shown separately below)	115,389	164,099	267,630	326,286
Selling, general and administrative expense	20,991	26,743	45,815	54,868
Depreciation and amortization	23,201	22,924	46,385	46,349
Restructuring and integration expense, net	0	0	0	(12)
Goodwill impairment	0	0	239,699	0
Other operating (income) expense, net	(955)	388	4,174	236
Income (loss) from operations	(8,206)	7,512	(253,538)	7,195
Interest expense	18,696	13,958	35,773	27,759
Loss on extinguishment of debt and write-off of debt issuance costs	0	0	0	2,699
Other (income) expense, net	(881)	57	239	786
Loss before benefit (provision) for income taxes and share of net income (loss) from joint venture	(26,021)	(6,503)	(289,550)	(24,049)
Benefit (provision) for income taxes	3,346	(577)	18,955	(2,818)
Share of net income (loss) from joint venture	927	(203)	656	66
Net loss	(21,748)	(7,283)	(269,939)	(26,801)
Other comprehensive gain (loss):
Foreign currency translation gain	994	(1,497)	(13,348)	(176)
Change in fair value of interest rate swap, net of tax	(1,255)	(6,962)	(12,464)	(10,818)
Less: reclassification adjustment for losses included in net loss, net of tax	2,638	0	3,690	0
Other comprehensive income (loss)	2,377	(8,459)	(22,122)	(10,994)
Comprehensive loss	$ (19,371)	$ (15,742)	$ (292,061)	$ (37,795)
Basic net loss per common share:
Net loss per common share (in dollars per shares)	$ (0.59)	$ (0.17)	$ (6.55)	$ (0.64)
Weighted average common shares outstanding (in shares)	42,197	42,028	42,154	42,000
Diluted net loss per common share:
Net loss per common share (in dollars per share)	$ (0.59)	$ (0.17)	$ (6.55)	$ (0.64)
Weighted average common shares outstanding (in shares)	42,197	42,028	42,154	42,000