Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net sales	$ 373,206	$ 370,084	$ 424,691
Cost of products sold (exclusive of depreciation and amortization shown separately below)	295,136	294,859	347,622
Selling, general and administrative	33,281	31,561	30,657
Depreciation and amortization	16,957	17,643	17,016
(Gain) loss on disposal of assets	5	(17)	(36)
Restructuring and impairment charges		967
Income from operations	27,827	25,071	29,432
Interest expense	2,374	3,878	4,715
Other expense (income), net	275	852	(1,388)
Income before provision (benefit) for income taxes	25,178	20,341	26,105
Provision (benefit) for income taxes	8,000	(3,927)	5,168
Net income	17,178	24,268	20,937
Other comprehensive income:
Foreign currency translation gain (loss)	3,899	2,806	(2,578)
Comprehensive income	$ 21,077	$ 27,074	$ 18,359
Basic income per share:
Net income	$ 1.00	$ 1.43	$ 1.24
Weighted average shares outstanding	17,176	17,009	16,817
Diluted income per share:
Net income	$ 1.00	$ 1.42	$ 1.24
Weighted average shares outstanding	17,260	17,114	16,953
Cash dividends per common share	$ 0.18	$ 0.00	$ 0.00