Condensed Consolidated Statements of Income and Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Income and Comprehensive Income (Loss) [Abstract]
Net sales	$ 115,922	$ 92,693	$ 227,229	$ 178,033
Cost of products sold (exclusive of depreciation and amortization shown separately below)	94,657	73,423	184,955	142,339
Selling, general and administrative	7,720	7,150	15,686	15,040
Depreciation and amortization	4,291	4,842	8,326	10,962
Loss on disposal of assets	3	2	3	3
Restructuring and impairment charges		667		1,236
Gain from deconsolidation of bankrupt subsidiary			(209)
Income from operations	9,251	6,609	18,468	8,453
Interest expense	1,220	1,755	2,444	3,483
Write-off of unamortized debt issuance costs				130
Other expense (income), net	155	(1,789)	1,191	(2,977)
Income before provision for income taxes	7,876	6,643	14,833	7,817
Provision for income taxes	2,049	1,520	3,499	2,469
Net income	5,827	5,123	11,334	5,348
Other comprehensive income (loss):
Foreign currency translation gain (loss)	1,964	(8,485)	8,494	(14,921)
Comprehensive income (loss )	$ 7,791	$ (3,362)	$ 19,828	$ (9,573)
Basic income per common share:	$ 0.35	$ 0.31	$ 0.68	$ 0.33
Weighted average shares outstanding	16,864	16,522	16,733	16,388
Diluted income per common share:	$ 0.34	$ 0.31	$ 0.67	$ 0.32
Weighted average shares outstanding	17,119	16,633	16,974	16,492