Right-of-Use Assets and Operating Lease Liabilities (Operating Leases - Undiscounted Cash Flows) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Ground Leases
Lessee, Lease, Description [Line Items]
2019	$ 136
2020	564
2021	573
2022	582
2023	582
Thereafter	6,145
Total	8,582
Headquarters Office Lease
Lessee, Lease, Description [Line Items]
2019	191
2020	773
2021	788
2022	804
2023	821
Thereafter	1,047
Total	$ 4,424