Nature of Operations and Summary of Significant Accounting Policies (Schedule Of Estimated Lives Of Property Plant And Equipment) (Details)	12 Months Ended
	Dec. 31, 2019
Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Buildings And Improvements [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Buildings And Improvements [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Leasehold Improvements [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Leasehold Improvements [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Machinery And Equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Machinery And Equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years
Furniture And Fixtures [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Furniture And Fixtures [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Model Furnishings [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Model Furnishings [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer Hardware And Software [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	1 year
Computer Hardware And Software [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years