Summary of Significant Accounting Policies (Schedule Of The Company's Interests In Land Option Agreements) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	$ 127,280	$ 91,034
Remaining Purchase Price	1,890,585	1,390,286
Land, Not Owned, Under Option Agreements	30,186	24,024
Consolidated and Unconsolidated VIEs [Member]
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	56,039	40,486
Remaining Purchase Price	891,506	661,158
Land, Not Owned, Under Option Agreements	12,533	8,167
Other Land Option Agreements Member
Land under option agreement [Line Items]
Deposits and Pre-acquisition Costs	71,241	50,548
Remaining Purchase Price	999,079	729,128
Land, Not Owned, Under Option Agreements	$ 17,653	$ 15,857