Condensed Consolidated Statements of Net Income and Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 214,272	$ 164,856	$ 426,498	$ 328,601
Cost of products sold (exclusive of depreciation and amortization shown separately below)	156,794	128,708	316,548	258,025
Selling, general and administrative	21,592	13,962	42,304	25,961
Depreciation and amortization	15,136	8,597	32,484	17,091
Restructuring and impairment charges	4,047		6,585
Income from operations	16,703	13,589	28,577	27,524
Interest expense	16,165	6,021	32,587	11,959
Other (income) expense, net	(824)	19	(1,953)	1,419
Income (loss) before provision (benefit) for income taxes and share of net income from joint venture	1,362	7,549	(2,057)	14,146
Provision (benefit) expense for income taxes	674	1,617	(46)	3,073
Share of net income from joint venture	1,343	1,021	2,743	1,882
Net income	2,031	6,953	732	12,955
Other comprehensive income (loss):
Change in fair value of interest rate hedge	(79)	(61)	(1,081)	(1,625)
Foreign currency translation gain (loss)	(2,925)	4,065	3,794	(12,231)
Other comprehensive income (loss)	(3,004)	4,004	2,713	(13,856)
Comprehensive income (loss)	$ (973)	$ 10,957	$ 3,445	$ (901)
Basic income per share:
Net income	$ 0.08	$ 0.36	$ 0.03	$ 0.68
Weighted average shares outstanding	27,024	19,215	26,923	19,064
Diluted income per share:
Net income	$ 0.07	$ 0.36	$ 0.03	$ 0.67
Weighted average shares outstanding	27,187	19,582	27,050	19,416
Cash dividends per common share	$ 0.07	$ 0.07	$ 0.14	$ 0.14