Summary Of Significant Accounting Policies (Property, Plant and Equipment) (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019
Minimum [Member] | Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	3 years
Minimum [Member] | Manufacturing Machinery [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	1 year
Maximum [Member] | Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	40 years
Maximum [Member] | Manufacturing Machinery [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	10 years
Maximum [Member] | Motor Vehicles [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years