Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]
Net sales	$ 563,985	$ 450,745	$ 322,347
Cost of goods sold	(520,015)	(417,918)	(314,987)
Gross margin	43,970	32,827	7,360
Other operating income (expense):
Selling expense	(7,351)	(6,758)	(6,343)
General and administrative expense	(15,238)	(14,096)	(11,869)
Defined benefit pension credit (expense)	24,388	4,654	(5,887)
Other postretirement benefit credit	5,799	5,258	4,748
Total other operating income (expense)	7,598	(10,942)	(19,351)
Operating income (loss)	51,568	21,885	(11,991)
Nonoperating income (expense):
Interest expense	(1,218)	(1,863)	(1,725)
Other, net	699	637	1,049
Total nonoperating expense	(519)	(1,226)	(676)
Income (loss) before income taxes	51,049	20,659	(12,667)
Income tax benefit (expense)	(20,838)	(8,645)	3,243
Net income (loss)	$ 30,211	$ 12,014	$ (9,424)
Basic and diluted income (loss) per share	$ 2.50	$ 0.99	$ (0.78)
Basic and diluted weighted average shares outstanding	12,102	12,102	12,102