Summary of Significant Accounting Policies (Schedule Of The Company's Interests In Land Option Agreements) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	$ 195,436	$ 162,119
Remaining Purchase Price	2,102,563	2,046,193
Other Land Option Agreements Member
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	126,909	84,478
Remaining Purchase Price	1,252,662	981,687
Consolidated and Unconsolidated VIEs [Member]
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	68,527	77,641
Remaining Purchase Price	$ 849,901	$ 1,064,506