The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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Disclosure of accounting policy for allocating interest on borrowings to operations reported as being discontinued. may also include the amount allocated to and reported in discontinued operations.

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 87-24

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section S99

-Paragraph 3

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f))

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For the disposal group, including a component of the entity (discontinued operation), the accumulated depreciation value of real estate investment property that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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For the disposal group, including a component of the entity (discontinued operation), carrying value of real estate investment property that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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The number of real estate properties, buildings or undeveloped land parcels held for sale in the period.

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The number of real estate properties, buildings or undeveloped land parcels sold during the period.

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For the investments in land and buildings held for sale, the accumulated depreciation value of real estate investment property that is classified as held for sale.

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Net carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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Discontinued Operations (Narrative) (Details) (USD $)	6 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	1 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended			12 Months Ended		6 Months Ended
Discontinued Operations (Narrative) (Details) (USD $)	Jun. 30, 2012	Feb. 29, 2012	Dec. 31, 2011	Jun. 30, 2012 Shopping Centers [Member] property	Dec. 31, 2011 Shopping Centers [Member] property	Jun. 30, 2012 Industrial Properties [Member] property	Dec. 31, 2011 Industrial Properties [Member] property	May 31, 2012 Wholly-Owned Industrial Properties [Member] property	Jun. 30, 2012 Arizona [Member] property	Dec. 31, 2011 Arizona [Member] Shopping Centers [Member]	Jun. 30, 2012 Florida [Member] property	Dec. 31, 2011 Florida [Member] Shopping Centers [Member] property	Jun. 30, 2012 Georgia [Member] property	Dec. 31, 2011 Georgia [Member] Industrial Properties [Member] property	Jun. 30, 2012 Illinois [Member] property	Dec. 31, 2011 Illinois [Member] Shopping Centers [Member] property	Jun. 30, 2012 Kansas [Member] property	Dec. 31, 2011 Kansas [Member] Shopping Centers [Member] property	Jun. 30, 2012 Louisiana [Member] property	Jun. 30, 2012 Maine [Member] property	Jun. 30, 2012 North Carolina [Member] property	Dec. 31, 2011 North Carolina [Member] Shopping Centers [Member] property	Jun. 30, 2012 Oklahoma [Member] property	Jun. 30, 2012 Tennessee [Member] property	Jun. 30, 2012 Texas [Member] property	Dec. 31, 2011 Texas [Member] Shopping Centers [Member] property	Dec. 31, 2011 Texas [Member] Industrial Properties [Member] property	Jun. 30, 2012 Virginia [Member] property
Discontinued Operations [Line Items]
Number of operating properties sold				13	8	53	3	52			6	1	6	2			1	1	2	1	1	1		1	47	5	1	2
Ownership percentage in joint ventures	75.00%	47.80%
Number of properties held for sale				7	7				1	1		1			1	1						1	1		4	3
Property classified as held for sale, gross	$ 84,000,000		$ 94,800,000
Accumulated depreciation for property held for sale	20,200,000
Property held for sale, net	63,747,000		73,241,000
Gross property included in discontinued operations			588,100,000
Accumulated depreciation for property included in discontinued operations			$ 139,200,000
Interest expense allocated to discontinued operations	We do not allocate other consolidated interest to discontinued operations because the interest savings to be realized from the proceeds of the sale of these operations is not material.