Mortgage Loans Payable And Unsecured Credit Facilities (Effect Of The Derivative Financial Instruments On The Consolidated Statements Of Operations And Consolidated Statements Of Equity) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Rate Swap [Member]
Derivative Instruments Gain Loss [Line Items]
Net amount of Gain (loss) recognized in other comprehensive income (effective portion)	$ 1,162,000	$ (4,539,000)	$ (3,650,000)
Continuing Operations [Member]
Derivative Instruments Gain Loss [Line Items]
Net amount of (Loss) recognized in other comprehensive income reclassified into earnings (effective portion)	$ (3,739,000)	$ (3,621,000)	(1,663,000)
Discontinued Operations [Member]
Derivative Instruments Gain Loss [Line Items]
Net amount of (Loss) recognized in other comprehensive income reclassified into earnings (effective portion)			$ (129,000)