Consolidated Statements of Income and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 488,601	$ 373,206	$ 370,084
Cost of products sold (exclusive of depreciation and amortization shown separately below)	384,889	295,136	294,859
Selling, general and administrative	43,756	33,281	31,561
Acquisition related costs excluded from selling, general and administrative	9,248
Depreciation and amortization	22,146	16,957	17,643
(Gain) loss on disposal of assets		5	(17)
Restructuring and impairment charges	875		967
Income from operations	27,687	27,827	25,071
Interest expense	12,293	2,374	3,878
Other expense, net	2,222	275	852
Income before provision (benefit) for income taxes and share of net income from joint venture	13,172	25,178	20,341
Provision (benefit) for income taxes	5,786	8,000	(3,927)
Share of net income (loss) from joint venture, net of tax	831
Net income	8,217	17,178	24,268
Other comprehensive income (loss):
Change in fair value of interest rate hedge	(431)
Foreign currency translation gain (loss)	(17,731)	3,899	2,806
Comprehensive income (loss)	$ (9,945)	$ 21,077	$ 27,074
Basic income per share:
Net income	$ 0.46	$ 1.00	$ 1.43
Weighted average shares outstanding	17,887	17,176	17,009
Diluted income per share:
Net income	$ 0.45	$ 1.00	$ 1.42
Weighted average shares outstanding	18,253	17,260	17,114
Cash dividends per common share	$ 0.28	$ 0.18	$ 0.00