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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Inventory Disclosure [Abstract]            
Homes under construction $ 527,102   $ 419,312      
Development projects in progress 825,355   785,777      
Land held for future development 87,718   112,565      
Land held for sale 9,927   17,759      
Capitalized interest 149,034 $ 144,847 139,203 $ 146,916 $ 144,299 $ 138,108
Model homes 78,225   68,191      
Total owned inventory $ 1,677,361   $ 1,542,807