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Income Taxes Summary of Effective Tax Rate (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Effective Tax Rates [Line Items]      
Provision computed at U.S. Federal statutory rate of 35% $ 145,366 $ 133,196 $ 85,226
Alternative fuel mixture and cellulosic biofuel producer credits (166,006) 81,695 0
State and local taxes, net of federal benefit 13,237 9,135 7,504
Domestic manufacturers deduction (11,712) (7,155) (7,670)
Other (1,836) (132) 417
Total provision (benefit) for taxes $ (20,951) $ 216,739 $ 85,477
U.S. Federal statutory rate 35.00%