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Inventory - Schedule of Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Real Estate [Abstract]            
Homes under construction $ 319,758   $ 262,476      
Development projects in progress 681,665   578,453      
Land held for future development 306,119   341,986      
Land held for sale 57,537   31,331      
Capitalized interest 72,256 61,836 52,562 45,501 41,922 38,190
Model homes 43,025   37,886      
Total owned inventory $ 1,480,360   $ 1,304,694