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Mortgage Loans Payable and Unsecured Credit Facility (Summary of Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member] | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract
Cash Flow Hedging, Count 2 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Count | contract | 2 |
Fair value | $ | $ 1,161,000 |
Cash Flow Hedging, Count 2 [Member] | Minimum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2023 |
Cash Flow Hedging, Count 2 [Member] | Maximum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2025 |
Cash Flow Hedging, Count 3 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Count | contract | 3 |
Fair value | $ | $ 1,128,000 |
Cash Flow Hedging, Count 3 [Member] | Minimum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2023 |
Cash Flow Hedging, Count 3 [Member] | Maximum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates | 2025 |
Cash Flow Hedging, Count 5 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Count | contract |  | 5
Fair value | $ |  | $ 8,232,000
Cash Flow Hedging, Count 5 [Member] | Minimum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates |  | 2023
Cash Flow Hedging, Count 5 [Member] | Maximum [Member] |  |
Derivatives Fair Value [Line Items] |  |
Maturity dates |  | 2025

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