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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Designation/Cash Flow [Member] | Interest Rate Swap [Member]        
Derivative Instruments Gain Loss [Line Items]        
Net amount of Gain (loss) recognized in other comprehensive income (effective portion) $ 872,000 $ 1,625,000 $ (332,000) $ (9,771,000)
Continuing Operations [Member]        
Derivative Instruments Gain Loss [Line Items]        
Net amount of (Loss) recognized in other comprehensive income reclassified into earnings (effective portion) $ (407,000) $ (881,000) $ (1,923,000) $ (2,711,000)