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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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net amount of gain (loss) recognized in other comprehensive income (effective portion)	$ 1,562,000	$ (1,977,000)	$ (1,185,000)	$ (1,442,000)
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion)	7,207,000	8,124,000	14,485,000	16,195,000
Continuing Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion)	$ 732,000	74,000	$ 1,463,000	151,000
Discontinued Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net amount of (gain) loss recognized in other comprehensive income reclassified into earnings (effective portion)		$ 53,000		$ 129,000