Acquisitions (Details 1) (USD $)	9 Months Ended
Sep. 30, 2011 Year Entity Property ReportableSegment sqft Store Loan
Intangible assets recorded in connection with the acquisitions
Intangible assets	$ 22,441,000
Weighted Average Amortization Period (in Years)	14.0
Leases, Acquired-in-Place [Member]
Intangible assets recorded in connection with the acquisitions
Intangible assets	12,357,000
Weighted Average Amortization Period (in Years)	5.2
Acquisitions (Textuals) [Abstract]
Above-market value of leases	1,100,000
Tenant Relations [Member]
Intangible assets recorded in connection with the acquisitions
Intangible assets	$ 10,084,000
Weighted Average Amortization Period (in Years)	10.1

The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAverageUsefulLife
Namespace Prefix:	us-gaap
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration