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Inventory And Land Held For Sale (Major Components Of Inventory) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]      
Homes under construction $ 2,421,405 $ 1,921,259 $ 1,408,260
Land under development 4,135,814 4,072,109 3,259,066
Raw land 589,911 777,287 782,732
House and land inventory $ 7,147,130 $ 6,770,655 $ 5,450,058