Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 143,671	$ 102,593	$ 387,734	$ 317,129
Cost and expenses:
Cost of sales	118,665	88,418	312,134	258,482
Selling, general, and administrative expenses	16,388	15,771	51,464	47,828
Research, technical, and product development expenses	925	783	2,447	2,536
Asset and asset-related charges (income)		(151)	(1,501)	(3,262)
Operating income (loss)	7,693	(2,228)	23,190	11,545
Other income (expense)	198	(519)	(238)	(153)
Interest income	331	127	911	358
Interest expense	(4,173)	(264)	(12,723)	(828)
Income (loss) before income taxes	4,049	(2,884)	11,140	10,922
Provision for income taxes	1,982	13,891	4,603	6,060
Net income (loss)	$ 2,067	$ (16,775)	$ 6,537	$ 4,862
Earnings (loss) per share:
Basic	$ 0.07	$ (0.56)	$ 0.22	$ 0.16
Diluted	$ 0.07	$ (0.56)	$ 0.22	$ 0.16
Weighted-average shares outstanding:
Basic	30,025,607	29,933,615	30,013,464	29,901,657
Diluted	30,251,411	29,933,615	30,278,456	30,143,031