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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
	Mar. 31, 2020	Mar. 31, 2019
Designation/Cash Flow [Member] | Interest Rate Swap [Member]
Derivative Instruments Gain Loss [Line Items]
(Loss) gain recognized in other comprehensive (loss) income (effective portion)	$ (15,363,000)	$ (4,877,000)
Continuing Operations [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in other comprehensive (loss) income reclassified into earnings (effective portion)	$ (349,000)	$ 565,000

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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