Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 196,349	$ 157,947	$ 365,497	$ 315,502
Cost of sales (exclusive of depreciation and amortization shown separately below)	148,640	114,514	275,084	228,994
Selling, general and administrative expense	26,641	18,004	48,818	34,645
Acquisition related costs excluded from selling, general and administrative expense	3,437	0	5,213	0
Depreciation and amortization	16,258	13,051	30,539	25,622
Other operating expense (income)	74	(270)	96	(270)
Restructuring and integration expense	1,591	6	2,346	17
Income (loss) from operations	(292)	12,642	3,401	26,494
Interest expense	15,988	12,338	27,984	27,177
Loss on extinguishment of debt and write-off of debt issuance costs	12,938	39,639	12,938	39,639
Derivative loss on change in interest rate swap fair value	0	101	0	13
Other (income) expense, net	1,887	285	1,574	(437)
Loss from continuing operations before benefit for income taxes and share of net income from joint venture	(31,105)	(39,721)	(39,095)	(39,898)
Benefit for income taxes	5,947	12,103	7,123	12,480
Share of net income from joint venture	647	1,244	1,478	2,937
Loss from continuing operations	(24,511)	(26,374)	(30,494)	(24,481)
Income from discontinued operations, net of tax (Note 2)	0	5,236	0	10,754
Net loss	(24,511)	(21,138)	(30,494)	(13,727)
Other comprehensive income (loss):
Foreign currency translation gain (loss)	(15,781)	9,511	(10,316)	14,616
Other comprehensive income (loss)	(15,781)	9,511	(10,316)	14,616
Comprehensive income (loss)	$ (40,292)	$ (11,627)	$ (40,810)	$ 889
Basic net loss per share:
Loss from continuing operations per share	$ (0.89)	$ (0.96)	$ (1.10)	$ (0.89)
Income from discontinued operations per share	0.00	0.19	0.00	0.39
Net loss per share	$ (0.89)	$ (0.77)	$ (1.10)	$ (0.50)
Weighted average shares outstanding	27,696	27,468	27,632	27,358
Diluted net loss per share:
Loss from continuing operations per share	$ (0.89)	$ (0.96)	$ (1.10)	$ (0.89)
Income from discontinued operations per share	0.00	0.19	0.00	0.39
Net loss per share	$ (0.89)	$ (0.77)	$ (1.10)	$ (0.50)
Weighted average shares outstanding	27,696	27,468	27,632	27,358
Cash dividends per common share	$ 0.07	$ 0.07	$ 0.14	$ 0.14