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Mortgage Loans Payable and Unsecured Credit Facility (Effect of Derivative Financial Instruments on Consolidated Statements of Operations and Consolidated Statements of Equity) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Designation/Cash Flow [Member] | Interest Rate Swap [Member]        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) recognized in other comprehensive (loss) income (effective portion) $ 113,000 $ (552,000) $ 1,869,000 $ (18,141,000)
Continuing Operations [Member]        
Derivative Instruments Gain Loss [Line Items]        
(Loss) gain recognized in other comprehensive (loss) income reclassified into earnings (effective portion) $ (1,482,000) $ (2,032,000) $ (4,942,000) $ (4,019,000)