Inventory And Land Held For Sale (Quantitative Information for Fair Value of Impairment Charges) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) impaired_community	Dec. 31, 2019 USD ($) impaired_community	Dec. 31, 2018 USD ($) impaired_community
Inventory [Line Items]
Impairment charges	$ 7,044	$ 8,617	$ 70,965
Impaired Inventory
Inventory [Line Items]
Number of communities | impaired_community	3	5	8
Fair Value of Communities Impaired, Net of Impairment Charges	$ 15,641	$ 10,702	$ 24,062
Impairment charges	7,044	8,617	70,695
Maximum | Impaired Inventory
Inventory [Line Items]
Average selling price	$ 878	$ 550	$ 586
Maximum | Quarterly Sales Pace (Homes) | Impaired Inventory
Inventory [Line Items]
Measurement input	6	6	11
Maximum | Discount Rate | Impaired Inventory
Inventory [Line Items]
Measurement input	0.17	0.14	0.22
Minimum | Impaired Inventory
Inventory [Line Items]
Average selling price	$ 305	$ 284	$ 287
Minimum | Quarterly Sales Pace (Homes) | Impaired Inventory
Inventory [Line Items]
Measurement input	2	1	2
Minimum | Discount Rate | Impaired Inventory
Inventory [Line Items]
Measurement input	0.13	0.12	0.12