Leases (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012 item
Operating Leased Assets [Line Items]
Option terms of lease	5 years
Minimum sublease rentals	$ 6,099
Number of sale leaseback transactions	6
Total deemed landlord financing	$ 3,529
Shopping Center Or Building Leases [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Combined initial and option terms lease	25 years
Shopping Center Or Building Leases [Member] \| Minimum [Member]
Operating Leased Assets [Line Items]
Combined initial and option terms lease	20 years
Ground Leases [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Combined initial and option terms lease	40 years
Ground Leases [Member] \| Minimum [Member]
Operating Leased Assets [Line Items]
Combined initial and option terms lease	30 years

Present value of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_PresentValueOfFutureMinimumLeasePaymentsSaleLeasebackTransactions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant