Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues	$ 518,585	$ 546,979
Costs and expenses:
Cost of sales	388,894	408,577
Selling, general and administrative	77,617	78,427
Amortization expense	3,156	3,156
Total costs and expenses	469,667	490,160
Earnings (loss) from operations	48,918	56,819
Other expenses and income:
Interest expense	7,054	9,775
Interest income	(58)	(139)
Loss on extinguishment of debt (Note 3)	0	13,352
Other income, net	(697)	(876)
Total other expenses (income), net	(6,299)	(22,112)
Earnings (loss) before income taxes	42,619	34,707
Income tax expense (Note 1)	16,198	13,296
Net earnings	$ 26,421	$ 21,411
Net earnings per common share, basic (Note 7)	$ 0.63	$ 0.43
Net earnings per common share, diluted (Note 7)	$ 0.60	$ 0.41
Weighted-average common shares outstanding, basic (Note 7)	42,114	49,929
Weighted-average common shares outstanding, diluted (Note 7)	44,045	52,333