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Summary of Significant Accounting Policies (Details 2) (USD $)
12 Months Ended
Dec. 31, 2013
Property, Plant, and Equipment  
Minimum project cost required for capitalization of interest $ 1,000,000
Minimum period required for completion of project for capitalization of interest (in months) 6 months
Improvements to land
 
Property, Plant, and Equipment  
Useful life (in years) 30 years
Buildings
 
Property, Plant, and Equipment  
Useful life (in years) 30 years
Automotive equipment
 
Property, Plant, and Equipment  
Useful life (in years) 5 years
Minimum | Machinery and equipment
 
Property, Plant, and Equipment  
Useful life (in years) 5 years
Minimum | Furniture and fixtures
 
Property, Plant, and Equipment  
Useful life (in years) 3 years
Minimum | Railcars
 
Property, Plant, and Equipment  
Useful life (in years) 25 years
Maximum | Machinery and equipment
 
Property, Plant, and Equipment  
Useful life (in years) 30 years
Maximum | Furniture and fixtures
 
Property, Plant, and Equipment  
Useful life (in years) 7 years
Maximum | Railcars
 
Property, Plant, and Equipment  
Useful life (in years) 40 years