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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)

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