Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues	$ 2,235,959	$ 2,333,512	$ 2,244,248
Costs and expenses:
Cost of sales	1,670,271	1,724,606	1,693,652
Selling, general and administrative	329,060	371,264	354,933
Amortization expense	12,624	12,624	12,624
Total costs and expenses	2,011,955	2,108,494	2,061,209
Gain from litigation settlement, net (Note 8)		490,085
Earnings from operations	224,004	715,103	183,039
Other expenses and income:
Interest expense	35,696	64,904	87,041
Interest income	(372)	(653)	(546)
Loss (gain) on extinguishment of debt (Note 3)	16,318	23,873	(10,028)
Other income, net	(7,382)	(5,676)	(4,371)
Total other expenses, net	44,260	82,448	72,096
Earnings before income taxes	179,744	632,655	110,943
Income tax expense	66,314	247,250	44,175
Net earnings	$ 113,430	$ 385,405	$ 66,768
Net earnings per common share, basic (Note 9)	$ 2.43	$ 7.84	$ 1.39
Net earnings per common share, diluted (Note 9)	$ 2.33	$ 7.42	$ 1.36
Weighted average common shares, basic (Note 9)	46,684	49,140	48,129
Weighted average common shares, diluted (Note 9)	48,777	51,957	49,270