Property And Equipment, Net (Schedule Of Estimated Useful Lives For Property And Equipment) (Details)	12 Months Ended
	Dec. 31, 2017
Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	20
Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	15
Buildings And Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	40
Buildings And Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10
Machinery And Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	8
Machinery And Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3
Office Furniture And Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7
Office Furniture And Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3
Computer Hardware And Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	7
Computer Hardware And Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3