Summary of Significant Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 M
Property, Plant, and Equipment
Minimum project cost required for capitalization of interest	$ 1.0
Minimum period required for completion of project for capitalization of interest (in months)	6
Improvements to land
Property, Plant, and Equipment
Useful life, low end of range (in years)	15
Useful life, high end of range (in years)	30
Buildings
Property, Plant, and Equipment
Useful life, low end of range (in years)	20
Useful life, high end of range (in years)	30
Machinery and equipment
Property, Plant, and Equipment
Useful life, low end of range (in years)	5
Useful life, high end of range (in years)	30
Automotive equipment
Property, Plant, and Equipment
Useful life, low end of range (in years)	5
Useful life, high end of range (in years)	15
Furniture and fixtures
Property, Plant, and Equipment
Useful life, low end of range (in years)	3
Useful life, high end of range (in years)	10
Railcars
Property, Plant, and Equipment
Useful life, low end of range (in years)	25
Useful life, high end of range (in years)	40