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Income Taxes Tax Credit Carryforwards (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
State and Foreign Tax Credits
 
Tax Credit Carryforward  
Gross Amount $ 3,099
Valuation Allowance (1,271)
Expiration 2013 - 2018
Cellulosic Biofuel Producer Credit
 
Tax Credit Carryforward  
Gross Amount 1,330
Valuation Allowance $ 0
Expiration 2016