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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%	$ 148,260	$ 131,147	$ 85,671
Alternative fuel mixture and cellulosic biofuel producer credits	(166,006)	81,695	0
State and local taxes, net of federal benefit	13,565	8,908	7,553
Domestic manufacturers deduction	(11,712)	(7,155)	(7,670)
Other	(1,836)	(132)	417
Total provision (benefit) for taxes	$ (17,729)	$ 214,463	$ 85,971
U.S. Federal statutory rate	35.00%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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