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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
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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

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