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Mortgage Loans Payable And Credit Facility (Effect Of The Derivative Financial Instruments On The Consolidated Statements Of Operations And Consolidated Statements Of Equity) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net amount of gain (loss) recognized in other comprehensive income (effective portion)	$ (5,434,000)	$ 324,000	$ (6,619,000)	$ (1,118,000)
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion)	6,927,000	8,216,000	21,412,000	24,411,000
Continuing Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion)	$ 1,087,000	$ 757,000	$ 2,550,000	908,000
Discontinued Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion)				$ 129,000