Leases (Future Minimum Payments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Ground Leases
2019	$ 1,831
2019		$ 2,441
2020	2,460	2,460
2021	2,497	2,497
2022	2,497	2,497
2023	2,497	2,497
Thereafter	202,603	202,603
Total minimum payments	214,385	214,995
Discount	(156,270)	(156,867)
Lease liability	58,115	58,128
Finance Ground Leases
2019	462
2019		462
2020	462	462
2021	6,562	6,562
2022	162	162
2023	162	162
Thereafter	3,838	3,838
Total minimum payments	11,648	11,648
Discount	(1,803)	(1,918)
Lease liability	$ 9,845	$ 9,730