Nature of Operations and Summary of Significant Accounting Policies--Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2014
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Automobiles and trucks [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	20 years
Office and computer equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Office and computer equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Building and improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Building and improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	40 years