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Mortgage Loans Payable and Unsecured Credit Facilities (Effect of Derivative Financial Instruments on Consolidated Statements of Operations and Consolidated Statements of Equity) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Designation/Cash Flow [Member] | Interest Rate Swap [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Gain (loss) recognized in other comprehensive (loss) income (effective portion) | $ (4,148,000) | $ (17,940,000) | $ (13,090,000)
Continuing Operations [Member] |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
(Loss) gain recognized in other comprehensive (loss) income reclassified into earnings (effective portion) | $ (6,476,000) | $ (6,062,000) | $ 1,196,000

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