Schedule III Real Estate (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	$ 25,717	$ 24,511	$ 24,511
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