CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net sales	$ 859,929	$ 787,936
Operating costs and expenses:
Cost of sales	756,395	712,228
Selling, general and administrative expenses	47,728	38,485
(Gain) on sale of assets, restructuring expense and other, net	(12,449)	582
Total operating costs and expenses	791,674	751,295
Operating income	68,255	36,641
Interest expense, net	(14,394)	(16,469)
Foreign exchange loss	(146)	(600)
Income before income taxes	53,715	19,572
Provision for income taxes	18,402	7,444
Net income	$ 35,313	$ 12,128
Earnings per share:
Basic (in dollars per share)	$ 1.02	$ 0.35
Diluted (in dollars per share)	$ 1.01	$ 0.35
Weighted average common shares:
Basic (in shares)	34,240	33,967
Diluted (in shares)	34,403	33,981