Real Estate Real Estate (Future Minimum Lease Payments) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Future Minimum Lease Payments [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 220,416
Operating Leases, Future Minimum Payments, Due in Two Years	213,157
Operating Leases, Future Minimum Payments, Due in Three Years	209,711
Operating Leases, Future Minimum Payments, Due in Four Years	206,856
Operating Leases, Future Minimum Payments, Due in Five Years	207,718
Operating Leases, Future Minimum Payments, Due Thereafter	1,585,696
Operating Leases, Future Minimum Payments Due	$ 2,643,554