Summary of Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2012
Building and Building Improvements | Minimum
Property and equipment
Estimated useful life	25 years
Building and Building Improvements | Maximum
Property and equipment
Estimated useful life	30 years
Office Equipment | Minimum
Property and equipment
Estimated useful life	3 years
Office Equipment | Maximum
Property and equipment
Estimated useful life	10 years
Railroad Transportation Equipment
Property and equipment
Estimated useful life	25 years
Machinery and Equipment | Minimum
Property and equipment
Estimated useful life	5 years
Machinery and Equipment | Maximum
Property and equipment
Estimated useful life	15 years
Leasehold Improvements | Minimum
Property and equipment
Estimated useful life	2 years
Leasehold Improvements | Maximum
Property and equipment
Estimated useful life	10 years