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Mortgage Loans Payable and Unsecured Credit Facility (Effect of Derivative Financial Instruments on Consolidated Statements of Operations and Consolidated Statements of Equity) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Designation/Cash Flow [Member] | Interest Rate Swap [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain recognized in other comprehensive (loss) income (effective portion) | $ 6,976,000 | $ 2,394,000
Continuing Operations [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
(Loss) recognized in other comprehensive (loss) income reclassified into earnings (effective portion) | $ (1,362,000) | $ (1,803,000)

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