Summary of Significant Accounting Policies (Schedule Of The Company's Interests In Land Option Agreements) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	$ 291,864	$ 299,437
Remaining Purchase Price	3,773,568	3,221,962
Land options with VIEs
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	126,900	123,775
Remaining Purchase Price	1,586,551	1,466,585
Other land options
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	164,964	175,662
Remaining Purchase Price	$ 2,187,017	$ 1,755,377