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Inventory (Summary of Interests in Land Option Agreements) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs $ 173,687 $ 162,119
Remaining Purchase Price 2,165,445 2,046,193
Land options with VIEs    
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs 69,279 77,641
Remaining Purchase Price 922,624 1,064,506
Other Land Option Agreements Member    
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs 104,408 84,478
Remaining Purchase Price $ 1,242,821 $ 981,687