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Mortgage Loans Payable And Unsecured Credit Facilities (Effect Of The Derivative Financial Instruments On The Consolidated Statements Of Operations And Consolidated Statements Of Equity) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion) $ 7,005,000 $ 7,278,000
Interest Rate Swap [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Net amount of gain (loss) recognized in other comprehensive income (effective portion) (5,892,000) (2,747,000)
Continuing Operations [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion) $ 922,000 $ 731,000