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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Real Estate [Abstract]            
Homes under construction $ 446,698   $ 377,281      
Development projects in progress 777,369   809,900      
Land held for future development 260,222   270,990      
Land held for sale 49,500   44,555      
Capitalized interest 140,139 $ 132,462 123,457 $ 112,476 $ 99,868 $ 87,619
Model homes 76,724   71,407      
Total owned inventory $ 1,750,652   $ 1,697,590