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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]            
Homes under construction $ 536,039   $ 476,752      
Development projects in progress 836,829   907,793      
Land held for future development 28,531   83,173      
Land held for sale 12,926   7,781      
Capitalized interest 144,756 $ 151,886 144,645 $ 149,034 $ 144,847 $ 139,203
Model homes 75,318   72,140      
Total owned inventory $ 1,634,399   $ 1,692,284