Summary Of Significant Accounting Policies (Schedule Of Allowances For Uncollectible Accounts Related To Tenant Receivables) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary Of Significant Accounting Policies [Abstract]
Beginning balance	$ 1,134	$ 1,780
Additional reserves	58	134
Collections/reversals	(94)	(104)
Write-offs	(15)	(434)
Ending balance	$ 1,083	$ 1,376