Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 221,666,000	$ 196,349,000	$ 434,922,000	$ 365,497,000
Cost of sales (exclusive of depreciation and amortization shown separately below)	163,513,000	148,640,000	324,782,000	275,084,000
Selling, general and administrative expense	26,743,000	26,641,000	54,868,000	48,818,000
Acquisition related costs excluded from selling, general and administrative expense	0	3,437,000	0	5,213,000
Depreciation and amortization	22,924,000	16,258,000	46,349,000	30,539,000
Restructuring and integration expense, net	0	1,591,000	(12,000)	2,346,000
Other operating (income) expense, net	388,000	74,000	236,000	96,000
Income (loss) from operations	8,098,000	(292,000)	8,699,000	3,401,000
Interest expense	13,958,000	15,988,000	27,759,000	27,984,000
Loss on extinguishment of debt and write-off of debt issuance costs	0	12,938,000	2,699,000	12,938,000
Other (income) expense, net	57,000	1,887,000	786,000	1,574,000
Loss before (provision) benefit for income taxes and share of net income from joint venture	(5,917,000)	(31,105,000)	(22,545,000)	(39,095,000)
Benefit (provision) for income taxes	(577,000)	5,947,000	(2,818,000)	7,123,000
Share of net income (loss) from joint venture	(203,000)	647,000	66,000	1,478,000
Net loss	(6,697,000)	(24,511,000)	(25,297,000)	(30,494,000)
Other comprehensive loss:
Change in fair value of interest rate swap, net of tax	(6,962,000)	0	(10,818,000)	0
Foreign currency translation loss	(1,434,000)	(15,781,000)	(172,000)	(10,316,000)
Other comprehensive loss	(8,396,000)	(15,781,000)	(10,990,000)	(10,316,000)
Comprehensive loss	$ (15,093,000)	$ (40,292,000)	$ (36,287,000)	$ (40,810,000)
Basic net loss per share
Net loss per share (in dollars per shares)	$ (0.16)	$ (0.89)	$ (0.60)	$ (1.10)
Weighted average shares outstanding	42,028	27,696	42,000	27,632
Diluted net loss per share
Net loss per share (in dollars per share)	$ (0.16)	$ (0.89)	$ (0.60)	$ (1.10)
Weighted average shares outstanding (in shares)	42,028	27,696	42,000	27,632