Identified Intangible Assets And Liabilities (Schedule Of Future Amortization (Accretion) Expense) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leases, Acquired-In-Place, Market Adjustment [Member]
Identified Intangible Assets And Liabilities [Line Items]
2013	$ (482,000)
2014	(311,000)
2015	(301,000)
2016	(340,000)
2017	(672,000)
Amortization (accretion)	(800,000)	(1,500,000)	(1,700,000)
Leases, Acquired-In-Place [Member]
Identified Intangible Assets And Liabilities [Line Items]
2013	10,751,000
2014	10,458,000
2015	8,496,000
2016	5,936,000
2017	5,325,000
Amortization (accretion)	7,800,000	6,200,000	5,900,000
Mortgages, Acquired-In-Place, Market Adjustment [Member]
Identified Intangible Assets And Liabilities [Line Items]
2013	(1,283,000)
2014	(1,318,000)
2015	(927,000)
2016	(509,000)
2017	(630,000)
Amortization (accretion)	$ (2,700,000)	$ (2,200,000)	$ (3,100,000)