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SCHEDULE III REAL ESTATE (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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
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