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)	Jun. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2019 - remaining	$ 827,000
2020	1,095,000
2021	956,000
2022	955,000
2023	956,000
Thereafter	30,466,000
Total undiscounted future minimum lease payments	35,255,000
Future minimum lease payments, discount	(21,050,000)
Right-of-use liabilities	$ 14,205,000

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)

Jun. 30, 2019

USD ($)

Commitments And Contingencies Disclosure [Abstract]

$ 827,000

1,095,000

956,000

955,000