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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
Net sales $ 1,927,973 $ 1,372,965 $ 1,250,069
Costs and expenses:      
Cost of sales (1,702,530) (1,173,804) (1,052,151)
Selling, general and administrative expenses (109,998) (100,394) (71,125)
Total operating costs and expenses (1,812,528) (1,274,198) (1,123,276)
Alternative Fuel Mixture Tax Credit       170,647
Income from operations 115,445 98,767 297,440
Interest expense, net (44,809) (22,571) (15,505)
Other, net 284     
Debt retirement costs       (6,250)
Earnings (loss) before income taxes 70,920 76,196 275,685
Income tax provision (31,246) (2,396) (93,221)
Net earnings (loss) $ 39,674 $ 73,800 $ 182,464
Net earnings per common share:      
Basic $ 1.73 $ 3.22 $ 8.03
Diluted $ 1.66 $ 3.12 $ 7.75