Summary of Significant Accounting Policies Property, Plant, and Equipment Policy Additional Information (Details)	12 Months Ended
	Dec. 31, 2017
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Average	30 years
Minimum [Member] | Machinery and Equipment, Computers and Software, and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Average	3 years
Maximum [Member] | Machinery and Equipment, Computers and Software, and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Average	10 years