Commitments and Contingencies (Summary of Reconciliation of Undiscounted Future Minimum Lease Payments for its Ground Lease and Executive Office Lease Agreements to Right-of-Use Liabilities) (Details)	Mar. 31, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2019 - remaining	$ 1,242,000
2020	1,095,000
2021	956,000
2022	955,000
2023	956,000
Thereafter	30,467,000
Total undiscounted future minimum lease payments	35,671,000
Future minimum lease payments, discount	(21,254,000)
Right-of-use liabilities	$ 14,417,000

Commitments and Contingencies (Summary of Reconciliation of Undiscounted Future Minimum Lease Payments for its Ground Lease and Executive Office Lease Agreements to Right-of-Use Liabilities) (Details)

Mar. 31, 2019

USD ($)

Commitments And Contingencies Disclosure [Abstract]

$ 1,242,000

1,095,000

956,000

955,000