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SCHEDULE III REAL ESTATE (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Land, initial cost $ 22,713      
Buildings and improvements, initial cost 4      
Land, gross amounts carried 22,713      
Buildings and improvements, gross amounts carried 4      
Carrying value, total 22,717 $ 22,717 $ 22,717 $ 25,717
Farmers Branch Texas [Member]        
Land, initial cost 22,713      
Buildings and improvements, initial cost 4      
Land, gross amounts carried 22,713      
Buildings and improvements, gross amounts carried 4      
Carrying value, total $ 22,717