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Mortgage Loans Payable and Unsecured Credit Facility (Summary of Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member] | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 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 | $ | $ 11,830,000 |
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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