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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Line Items]      
Alternative fuel mixture and cellulosic biofuel producer credits   $ 104,785,000 $ 61,673,000
Cash payments for income taxes 52,700,000 19,100,000 22,300,000
Income tax credit carryforwards 167,500,000    
Decrease uncertain tax positions, gross 2,000,000    
Decrease uncertain tax positions, net 1,300,000    
Tax reserve on uncertain tax positions 111,013,000 112,311,000 9,041,000
Unrecognized tax benefits that would impact of effective tax rate 106,800,000    
Income tax, interest expense gross 200,000 200,000  
Income tax, interest expense net 160,000 90,000  
Income tax, accrued interest expense gross 2,200,000 2,000,000  
Income tax, accrued interest expense net 1,400,000 1,200,000  
Change in uncertain tax positions, minimum 0    
Change in uncertain tax positions, maximum 104,700,000    
Cellulosic Biofuel Tax Credits [Member]
      
Income Taxes [Line Items]      
Income tax credit carryforwards 167,500,000    
Tax reserve on uncertain tax positions   $ 102,000,000  
Federal [Member]
      
Income Taxes [Line Items]      
Income tax examination, year of examination federal examination of the tax years 2002 and 2004 has been concluded. The tax years 2008 — 2011 remain open to federal examination.    
Federal [Member] | Cellulosic Biofuel Tax Credits [Member]
      
Income Taxes [Line Items]      
Income tax examination, year of examination 2009    
State [Member]
      
Income Taxes [Line Items]      
Income tax examination, year of examination The tax years 2002 — 2011 remain open to state examinations.