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Summary of Significant Accounting Policies (Schedule Of The Company's Interests In Land Option Agreements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Land under option agreement [Line Items]    
Deposits and Pre-acquisition Costs $ 207,987 $ 195,436
Remaining Purchase Price 2,462,579 2,102,563
Other Land Option Agreements Member    
Land under option agreement [Line Items]    
Deposits and Pre-acquisition Costs 129,098 126,909
Remaining Purchase Price 1,485,099 1,252,662
Consolidated and Unconsolidated VIEs [Member]    
Land under option agreement [Line Items]    
Deposits and Pre-acquisition Costs 78,889 68,527
Remaining Purchase Price $ 977,480 $ 849,901