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