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Mortgage Loans Payable and Unsecured Credit Facility (Summary of Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) contract	Dec. 31, 2020 USD ($) contract
Cash Flow Hedging, Count 7 [Member]
Derivatives Fair Value [Line Items]
Count | contract	5
Fair value | $	$ 13,208,000
Cash Flow Hedging, Count 7 [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Maturity dates	2022
Cash Flow Hedging, Count 7 [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Maturity dates	2025
Cash Flow Hedging, Count 2 [Member]
Derivatives Fair Value [Line Items]
Count | contract		7
Fair value | $		$ 18,927,000
Cash Flow Hedging, Count 2 [Member] | Minimum [Member]
Derivatives Fair Value [Line Items]
Maturity dates		2021
Cash Flow Hedging, Count 2 [Member] | Maximum [Member]
Derivatives Fair Value [Line Items]
Maturity dates		2025

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- Definition

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+ References

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-SubTopic 10
-Section 50
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