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

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-Name Statement of Financial Accounting Standard (FAS)

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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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-Name Accounting Standards Codification

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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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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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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 $)	9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended			12 Months Ended	9 Months Ended			12 Months Ended		9 Months Ended
Discontinued Operations (Narrative) (Details) (USD $)	Sep. 30, 2012	Feb. 29, 2012	Dec. 31, 2011	Sep. 30, 2012 Shopping Centers [Member] property	Dec. 31, 2011 Shopping Centers [Member] property	Sep. 30, 2012 Industrial Properties [Member] property	Dec. 31, 2011 Industrial Properties [Member] property	May 31, 2012 Wholly-Owned Industrial Properties [Member] property	Sep. 30, 2012 Arizona [Member] property	Dec. 31, 2011 Arizona [Member] Shopping Centers [Member] property	Sep. 30, 2012 Florida [Member] property	Dec. 31, 2011 Florida [Member] Shopping Centers [Member] property	Sep. 30, 2012 Georgia [Member] property	Dec. 31, 2011 Georgia [Member] Industrial Properties [Member] property	Sep. 30, 2012 Illinois [Member] property	Dec. 31, 2011 Illinois [Member] Shopping Centers [Member] property	Sep. 30, 2012 Kansas [Member] property	Dec. 31, 2011 Kansas [Member] Shopping Centers [Member] property	Sep. 30, 2012 Louisiana [Member] property	Sep. 30, 2012 Maine [Member] property	Sep. 30, 2012 North Carolina [Member] property	Dec. 31, 2011 North Carolina [Member] Shopping Centers [Member] property	Sep. 30, 2012 Oklahoma [Member] property	Sep. 30, 2012 Tennessee [Member] property	Sep. 30, 2012 Texas [Member] property	Dec. 31, 2011 Texas [Member] Shopping Centers [Member] property	Dec. 31, 2011 Texas [Member] Industrial Properties [Member] property	Sep. 30, 2012 Virginia [Member] property
Discontinued Operations [Line Items]
Number of operating properties sold				21	8	53	3	52	1		6	1	6	2			1	1	2	1	2	1	1	1	52	5	1	2
Ownership percentage in joint ventures	75.00%	47.80%
Number of properties held for sale				6	7				1	1		1			1	1					1	1			3	3
Property classified as held for sale, gross	$ 94,500,000		$ 94,800,000
Accumulated depreciation for property held for sale	21,100,000
Property held for sale, net	73,404,000		73,241,000
Gross property included in discontinued operations			660,600,000
Accumulated depreciation for property included in discontinued operations			$ 155,800,000
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.