Mortgage Loans Payable and Unsecured Credit Facilities (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Parenthetical) (Details) - Revolving Credit Facility [Member] |
12 Months Ended |
|---|---|
|
Dec. 31, 2021
Term
| |
| Debt Instrument [Line Items] | |
| Line of credit facility extension allowed period | 1 year |
| Line of credit facility extension allowed term | 2 |