Leases - Future Minimum Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Ground Leases
Year one	$ 2,959	$ 3,175
Year two	2,672	2,959
Year three	2,614	2,672
Year four	2,497	2,614
Year five	2,517	2,497
Thereafter	197,589	200,107
Total minimum payments	210,848	214,024
Discount	(152,229)	(154,645)
Lease liability	58,619	59,379
Finance Ground Leases
Year one	162	462
Year two	162	6,562
Year three	162	162
Year four	162	162
Year five	3,676	162
Thereafter	0	3,676
Total minimum payments	4,324	11,186
Discount	(769)	(1,456)
Lease liability	$ 3,555	$ 9,730