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Mortgage Loans Payable and 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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Designation/Cash Flow [Member] | Interest Rate Swap [Member]        
Derivative Instruments Gain Loss [Line Items]        
Net amount of (Loss) gain recognized in other comprehensive (loss) income (effective portion) $ (2,883,000) $ 2,375,000 $ (15,837,000) $ 10,221,000
Continuing Operations [Member]        
Derivative Instruments Gain Loss [Line Items]        
Net amount of Gain (loss) recognized in other comprehensive (loss)income reclassified into earnings (effective portion) $ 216,000 $ 246,000 $ 1,300,000 $ 265,000