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Income Taxes Tax Credit Carryforwards (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
State and Foreign Tax Credits
Tax Credit Carryforward
Gross Amount	$ 3,418
Valuation Allowance	(1,015)
Expiration	10 years
Cellulosic Biofuel Producer Credit
Tax Credit Carryforward
Gross Amount	1,025
Valuation Allowance	$ 0
Expiration	4 years

- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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- Definition

The portion of the deferred tax asset arising from a tax credit carryforward for which it is more likely than not that a tax benefit will not be realized.

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