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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
Mar. 31, 2021
Mar. 31, 2020
Designation/Cash Flow [Member] | Interest Rate Swap [Member]    
Derivative Instruments Gain Loss [Line Items]    
(Loss) gain recognized in other comprehensive (loss) income (effective portion) $ 2,394,000 $ (15,363,000)
Continuing Operations [Member]    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) recognized in other comprehensive (loss) income reclassified into earnings (effective portion) $ (1,803,000) $ (349,000)