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Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Completed home inventory and residential lots held for sale $ 165,107 $ 106,043
Work in process and land under development 480,419 386,181
Inventory, Land Held-for-sale 2,715 3,830
Total inventory $ 648,241 $ 496,054