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Mortgage Loans Payable And Credit Facilities (Effect Of The Derivative Financial Instruments On The Consolidated Statements Of Operations And Consolidated Statements Of Equity) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Interest Rate Swap [Member]        
Derivative Instruments Gain Loss [Line Items]        
Net amount of Gain (loss) recognized in other comprehensive income (effective portion) $ 1,625,000 $ (5,434,000) $ (9,771,000) $ (6,619,000)
Continuing Operations [Member]        
Derivative Instruments Gain Loss [Line Items]        
Net amount of (Loss) recognized in other comprehensive income reclassified into earnings (effective portion) $ (881,000) $ (1,087,000) $ (2,711,000) $ (2,550,000)