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Inventory And Land Held For Sale (Land Held For Sale) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Land held for sale, gross $ 142,070 $ 38,157
Net realizable value reserves (73,686) (6,429)
Land held for sale, net $ 68,384 $ 31,728