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Mortgage Loans Payable and Unsecured Credit Facilities (Summary of Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018 USD ($) contract	Dec. 31, 2017 USD ($) contract
Cash Flow Hedging, Count 2 [Member]
Derivatives Fair Value [Line Items]
Count | contract		2	2
Fair value | $		$ 136,000	$ 1,576,000
Maturity dates			2025
Cash Flow Hedging, Count 2 [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Maturity dates		2020
Cash Flow Hedging, Count 2 [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Maturity dates		2023
Cash Flow Hedging, Count 6 [Member]
Derivatives Fair Value [Line Items]
Count | contract		6
Fair value | $		$ 7,180,000
Cash Flow Hedging, Count 6 [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Maturity dates	2021
Cash Flow Hedging, Count 6 [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Maturity dates	2025
Cash Flow Hedging, Count 7 [Member]
Derivatives Fair Value [Line Items]
Count | contract			7
Fair value | $			$ 8,871,000
Cash Flow Hedging, Count 7 [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Maturity dates			2019
Cash Flow Hedging, Count 7 [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Maturity dates			2024

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- Definition

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+ References

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-Section 50
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