Inventory And Land Held For Sale (Quantitative Information for Fair Value of Impairment Charges) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) impaired_community	Dec. 31, 2017 USD ($) impaired_community	Dec. 31, 2016 USD ($) impaired_community	Jun. 30, 2017 USD ($) inactive_community
Inventory [Line Items]
Number of communities | inactive_community				17
Fair Value of Communities Impaired, Net of Impairment Charges				$ 151,000
Impairment charges	$ 70,965	$ 88,952	$ 1,074
Impaired Inventory
Inventory [Line Items]
Number of communities | impaired_community	8	9	2
Fair Value of Communities Impaired, Net of Impairment Charges	$ 24,062	$ 19,252	$ 8,920
Impairment charges	70,965	88,952	$ 1,074
Discount Rate | Impaired Inventory
Inventory [Line Items]
Measurement input			0.12
Maximum | Impaired Inventory
Inventory [Line Items]
Average selling price	$ 586	$ 818	$ 563
Maximum | Quarterly Sales Pace (Homes) | Impaired Inventory
Inventory [Line Items]
Measurement input	11	11	5
Maximum | Discount Rate | Impaired Inventory
Inventory [Line Items]
Measurement input	0.22	0.25
Minimum | Impaired Inventory
Inventory [Line Items]
Average selling price	$ 287	$ 207	$ 109
Minimum | Quarterly Sales Pace (Homes) | Impaired Inventory
Inventory [Line Items]
Measurement input	2	1	3
Minimum | Discount Rate | Impaired Inventory
Inventory [Line Items]
Measurement input	0.12	0.12