Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013 jvs property	Dec. 31, 2012 property
Unconsolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Debt associated with tenancy-in-common arrangement	$ 20.6
Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures	2
Number of neighborhood/community shopping centers	28	30
Through Guaranty On Debt [Member] | Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures	1
Through Guaranteed Distributions and Loan Guaranty [Member] | Consolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures	1
Through Secured Loans [Member] | Unconsolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures	2