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Mortgage Loans Payable and Unsecured Credit Facility (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Parenthetical) (Details)
9 Months Ended
Aug. 04, 2020
Sep. 30, 2020
Unsecured Credit Facility [Member]    
Debt Instrument [Line Items]    
Expected increase in weighted average interest rate subject to increase in leverage ratio   0.15%
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of credit facility extension allowed period 1 year 1 year