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Business Acquisitions Business Acquisitions (Details 4) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
May 01, 2012
Amaizing Energy Denison LLC
   
Business Acquisition [Line Items]    
Current assets   $ 14,285
Inventory   10,087
Intangible assets   2,373
Other current assets   962
Property, plant and equipment   49,693
Purchase Price   77,400
Intangible assets acquired   2,373
Weighted average useful life 3 years [1]  
Lease Intangibles | Amaizing Energy Denison LLC
   
Business Acquisition [Line Items]    
Intangible assets acquired   2,123
Noncompete agreement
   
Business Acquisition [Line Items]    
Useful Life 2 years  
Noncompete agreement | Amaizing Energy Denison LLC
   
Business Acquisition [Line Items]    
Intangible assets acquired   $ 250
Minimum | Lease Intangibles | Amaizing Energy Denison LLC
   
Business Acquisition [Line Items]    
Useful Life 10 months  
Maximum | Lease Intangibles | Amaizing Energy Denison LLC
   
Business Acquisition [Line Items]    
Useful Life 5 years  
[1] weighted average number of years