Lease Agreements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Operating Leases, Future Minimum Payments Receivable [Line Items]
Operating Leases, Future Minimum Payments Receivable, Current	$ 201,219
Operating Leases, Future Minimum Payments Receivable, in Two Years	170,052
Operating Leases, Future Minimum Payments Receivable, in Three Years	139,117
Operating Leases, Future Minimum Payments Receivable, in Four Years	118,637
Operating Leases, Future Minimum Payments Receivable, in Five Years	90,345
Operating Leases, Future Minimum Payments Receivable, Thereafter	214,037
Operating Leases, Future Minimum Payments Receivable	$ 933,407
Operating Lease Expirations, Lessor, Minimum	2012
Operating Lease Expiration, Lessor, Maximum	2049
Consolidated Properties [Member]
Operating Leases, Future Minimum Payments Receivable [Line Items]
Number of Stores	2,300
Number Of Owned And Operated Outlet Centers	36