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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
Consolidated Statements Of Income [Abstract]      
Net sales $ 2,620,111 $ 2,435,606 $ 2,147,589
Cost of sales (2,078,165) (1,903,406) (1,721,012)
Gross profit 541,946 532,200 426,577
Selling and administrative expenses (193,939) (182,489) (173,445)
Corporate overhead (64,535) (58,100) (54,580)
Alternative fuel mixture tax credits   (86,265) 168,437
Other expense, net (10,723) (19,964) (14,535)
Income from operations 272,749 185,382 352,454
Interest expense, net (29,245) (32,278) (35,483)
Income before taxes 243,504 153,104 316,971
(Provision) benefit for income taxes (85,477) 52,331 (51,076)
Net income $ 158,027 $ 205,435 $ 265,895
Weighted average common shares outstanding      
Basic 99,281 101,678 101,577
Diluted 100,376 102,608 102,358
Net income per common share      
Basic $ 1.59 $ 2.02 $ 2.62
Diluted $ 1.57 $ 2.00 $ 2.60
Dividends declared per common share $ 0.80 $ 0.60 $ 0.60