Other Assets and Deferred Charges, Net (Schedule of Future Charges of Unamortized Balances of Deferred Lease Origination Costs and Deferred Financing Costs) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred Costs And Other Assets [Line Items]
Lease origination costs, 2020	$ 2,858,000
Lease origination costs, 2021	2,280,000
Lease origination costs, 2022	1,995,000
Lease origination costs, 2023	1,700,000
Lease origination costs, 2024	1,453,000
Lease origination costs, thereafter	9,661,000
Lease origination costs	19,947,000	$ 21,623,000
Financing costs	2,769,000	3,536,000
Unsecured Revolving Credit Facility [Member]
Deferred Costs And Other Assets [Line Items]
Financing costs, 2020	614,000
Financing costs, 2021	407,000
Financing costs	$ 1,021,000	$ 1,627,000