The item represents the difference, if any, between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee. A difference can arise between the carrying value of the equity method investment and the value of the Entity's amount of underlying equity in net assets of the investee, for example, from appreciation of certain assets which is not recognized in earnings, but is recognized in other comprehensive income (a separate component of shareholders' equity) by the investee.

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 323

-SubTopic 10

-Section 50

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- Definition

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

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 26

-Subparagraph b

-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 230

-SubTopic 10

-Section 45

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

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The cash inflow from the sale of real estate held-for-investment and real estate joint ventures.

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Acquisitions of operating properties.

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Investment In Real Estate Joint Ventures And Partnerships [Line Items]

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

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The cash and non-cash purchase price associated with the acquisition of an equity method investment.

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Investment In Real Estate Joint Ventures And Partnerships (Narrative) (Details) (USD $)	3 Months Ended			9 Months Ended				9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended				1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Mar. 31, 2010	Sep. 30, 2011	Sep. 30, 2010	Apr. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Industrial Properties [Member]	Sep. 30, 2011 Retail Buildings [Member]	Dec. 31, 2010 Retail Buildings [Member] Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2011 Undeveloped Land Parcels [Member]	Dec. 31, 2010 Undeveloped Land Parcels [Member] Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2011 Retail Properties [Member]	Apr. 30, 2011 Retail Properties [Member] Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2011 Industrial Buildings [Member]	Sep. 30, 2011 Industrial Buildings [Member] Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2011 Minimum [Member] Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2011 Maximum [Member] Unconsolidated Real Estate Joint Ventures [Member]	Apr. 30, 2011 Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2011 Unconsolidated Real Estate Joint Ventures [Member]	Dec. 31, 2010 Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2010 Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2011 Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2010 Unconsolidated Real Estate Joint Ventures [Member]	Dec. 31, 2010 Unconsolidated Real Estate Joint Ventures [Member]	Apr. 13, 2011 Palm Coast [Member]	Apr. 02, 2010 Sheridan [Member]
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Equity method investment ownership percentage	47.80%			47.80%		50.00%											7.80%	75.00%								50.00%	50.00%
Number of operating properties acquired														3
Number of operating properties sold			2					2	1	2	8	2	3		1	2
Net basis differentials for equity method investments	$ 7,200,000			$ 7,200,000			$ 8,800,000
Impairment losses related to property																				26,700,000		0	28,800,000	200,000
Management fees revenue, related parties	1,500,000	1,400,000		4,600,000	4,300,000
Gross sales proceeds received by unconsolidated real estate joint ventures																							7,600,000		8,300,000
Acquisition of unconsolidated real estate joint venture interests																			$ 11,600,000		$ 35,800,000