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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 ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion) $ 28,272,000 $ 32,301,000 $ 34,762,000
Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net amount of gain (loss) recognized in other comprehensive income (effective portion) (4,539,000) (3,650,000) 202,000
Continuing Operations [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion) $ 3,621,000 1,663,000 749,000
Discontinued Operations [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion)   $ 129,000 $ 309,000