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Mortgage Loans Payable and Unsecured Credit Facility (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Parenthetical) (Details) - Revolving Credit Facility [Member]
6 Months Ended
Jun. 30, 2022
Term
Debt Instrument [Line Items]  
Line of credit facility extension allowed period 1 year
Line of credit facility extension allowed term 2