Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 102,528	$ 93,797
Cost of products sold (exclusive of depreciation and amortization shown separately below)	80,283	74,517
Selling, general and administrative	10,030	9,106
Depreciation and amortization	3,877	4,531
Loss on disposal of assets		4
Income from operations	8,338	5,639
Interest expense	564	785
Other expense, net	83	579
Income before provision for income taxes	7,691	4,275
Provision for income taxes	2,453	1,404
Net income	5,238	2,871
Other comprehensive income:
Foreign currency translation loss	(639)	(1,805)
Comprehensive income	$ 4,599	$ 1,066
Basic income per common share:	$ 0.30	$ 0.17
Weighted average shares outstanding	17,656	17,055
Diluted income per common share:	$ 0.29	$ 0.17
Weighted average shares outstanding	17,962	17,162
Cash dividends per common share	$ 0.07	$ 0.00