Summary of Significant Accounting Policies (Property Plant and Equipment) (Details)	12 Months Ended
	Dec. 31, 2017
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Minimum | Machinery, office furniture and equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Maximum | Machinery, office furniture and equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years