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Inventory (Summary of Interests in Land Option Agreements) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Deposits and Pre-acquisition Costs	$ 178,807	$ 162,119
Remaining Purchase Price	2,094,140	2,046,193
Land options with VIEs
Variable Interest Entity [Line Items]
Deposits and Pre-acquisition Costs	80,063	77,641
Remaining Purchase Price	928,327	1,064,506
Other Land Option Agreements Member
Variable Interest Entity [Line Items]
Deposits and Pre-acquisition Costs	98,744	84,478
Remaining Purchase Price	$ 1,165,813	$ 981,687