Nature of Operations and Summary of Significant Accounting Policies (Schedule Of Estimated Lives Of Property Plant And Equipment) (Details)	12 Months Ended
	Dec. 31, 2018
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	2 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	3 years
Buildings And Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	3 years
Buildings And Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	40 years
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	3 years
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	10 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	25 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	2 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	7 years
Model Furnishings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	2 years
Model Furnishings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	5 years
Computer Hardware and Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	1 year
Computer Hardware and Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of the community based	5 years