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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The gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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Payments to develop real estate assets is the process of adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements; and are generally classified as cash flow from investing activities.

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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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Number of acquisitions of operating properties.

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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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Gross purchase price from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Gross cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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Number Of Properties Reclassified From Held For Sale

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

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Real Estate Assets, Reclassified for Change in Plan, Gross

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Property (Narrative) (Details) (USD $)	12 Months Ended						12 Months Ended
Property (Narrative) (Details) (USD $)	Dec. 31, 2012 property	Feb. 29, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 30, 2010	Aug. 06, 2012 Tenancy In Common [Member]	Dec. 31, 2012 Shopping Centers [Member] property	Dec. 31, 2011 Shopping Centers [Member] property	Dec. 31, 2012 Industrial Properties [Member] property
Real Estate Investment Property [Line Items]
Number of operating properties acquired							4
Gross payments to acquire real estate	$ 232,300,000
Ownership percentage in joint ventures	75.00%	47.80%			50.00%	79.60%
Investment in new development projects	29,500,000
Number of operating properties sold							27		54
Gross proceeds from sale and disposition of property	620,700,000
Gains on dispositions	69,500,000
Number of properties held for sale	0						0	7
Property held for sale, gross	0		94,761,000	0
Number of properties reclassified from held for sale							2
Property reclassified from held for sale, gross	$ 18,090,000		$ 0	$ 0