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Land and Development (Schedule of Land and Development) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Land and Development Assets      
Total land and development, net $ 650,531   $ 860,311
Capital expenditures on land and development assets (98,489) $ (84,966)  
Land & Development      
Land and Development Assets      
Land and land development, at cost 658,905   868,692
Less: accumulated depreciation (8,374)   (8,381)
Total land and development, net $ 650,531   $ 860,311