Mortgage Loans On Real Estate (Summary Of Changes In Mortgage Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, Beginning of Year	$ 3,410	$ 3,410	$ 15,438
Collections/Reductions of Principal	0	0	(12,028)
Balance, End of Year	$ 3,410	$ 3,410	$ 3,410