Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 213,897,000	$ 205,683,000	$ 648,819,000	$ 571,180,000
Cost of sales (exclusive of depreciation and amortization shown separately below)	160,816,000	156,408,000	485,598,000	431,492,000
Selling, general and administrative expense	24,043,000	22,480,000	78,911,000	71,298,000
Acquisition related costs excluded from selling, general and administrative expense	0	597,000	0	5,810,000
Depreciation and amortization	22,621,000	21,259,000	68,970,000	51,798,000
Restructuring and integration expense, net	0	(209,000)	(12,000)	2,137,000
Other operating (income) expense, net	(1,255,000)	(733,000)	(1,019,000)	(638,000)
Income from operations	7,672,000	5,881,000	16,371,000	9,283,000
Interest expense	14,733,000	18,608,000	42,492,000	46,592,000
Loss on extinguishment of debt and write-off of debt issuance costs	0	6,624,000	2,699,000	19,562,000
Other (income) expense, net	98,000	308,000	884,000	1,882,000
Loss before (provision) benefit for income taxes and share of net income from joint venture	(7,159,000)	(19,659,000)	(29,704,000)	(58,753,000)
Benefit (provision) for income taxes	1,283,000	5,609,000	(1,535,000)	12,213,000
Share of net income from joint venture	279,000	266,000	345,000	1,744,000
Net loss	(5,597,000)	(13,784,000)	(30,894,000)	(44,796,000)
Other comprehensive loss:
Foreign currency translation adjustment	(11,448,000)	(4,193,000)	(11,620,000)	(14,509,000)
Change in fair value of interest rate swap, net of tax	(1,181,000)		(11,999,000)
Change in fair value of interest rate swap, net of tax		0		0
Less: reclassification adjustment for (gains) losses included in net income, net of tax	238,000	0	238,000	0
Other comprehensive loss	(12,391,000)	(4,193,000)	(23,381,000)	(14,509,000)
Comprehensive loss	$ (17,988,000)	$ (17,977,000)	$ (54,275,000)	$ (59,305,000)
Basic net loss per share:
Net loss per share (in dollars per shares)	$ (0.13)	$ (0.48)	$ (0.74)	$ (1.61)
Weighted average shares outstanding (in shares)	42,038	28,688	42,013	27,784
Diluted net loss per share:
Net loss per share (in dollars per share)	$ (0.13)	$ (0.48)	$ (0.74)	$ (1.61)
Weighted average shares outstanding (in shares)	42,038	28,688	42,013	27,784