Basis Of Presentation Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2017
Property and equipment [Line Items]
Operating leases, term	20 years
Building [Member] | Maximum [Member]
Property and equipment [Line Items]
Useful life	30 years
Building [Member] | Minimum [Member]
Property and equipment [Line Items]
Useful life	9 years
Equipment [Member] | Maximum [Member]
Property and equipment [Line Items]
Useful life	7 years
Equipment [Member] | Minimum [Member]
Property and equipment [Line Items]
Useful life	3 years
Computer Equipment [Member] | Maximum [Member]
Property and equipment [Line Items]
Useful life	7 years
Computer Equipment [Member] | Minimum [Member]
Property and equipment [Line Items]
Useful life	3 years