Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(3)

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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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)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Name Accounting Standards Codification

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- Definition

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

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

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- Definition

The cash outflow from the purchase of ownership in a partnership, the purpose of which is to construct, sell, hold or invest in real estate.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 17

-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

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

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- Definition

The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

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-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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-Name Accounting Standards Codification

-Topic 230

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-Section 45

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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6516133

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-Name Statement of Financial Accounting Standard (FAS)

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- Definition

Number of acquisitions of operating properties.

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Business Acqusition, Purchase Price Allocation, Assumption of Debt

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- Definition

This item represents the amount of gross sales proceeds received on disposal of an equity method investment.

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The charge against earnings from continuing operations resulting from the aggregate write down of all assets from their carrying value to their fair value.

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

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Investment In Real Estate Joint Ventures And Partnerships (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended						12 Months Ended							0 Months Ended		12 Months Ended			1 Months Ended
	Feb. 29, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 30, 2010	Nov. 30, 2012 Minimum [Member]	Nov. 30, 2012 Maximum [Member]	Dec. 31, 2012 Unconsolidated Real Estate Joint Ventures [Member] property	Dec. 31, 2011 Unconsolidated Real Estate Joint Ventures [Member]	Dec. 31, 2010 Unconsolidated Real Estate Joint Ventures [Member]	Dec. 31, 2012 Unconsolidated Real Estate Joint Ventures [Member] Minimum [Member]	Dec. 31, 2011 Unconsolidated Real Estate Joint Ventures [Member] Minimum [Member]	Dec. 31, 2012 Unconsolidated Real Estate Joint Ventures [Member] Maximum [Member]	Dec. 31, 2011 Unconsolidated Real Estate Joint Ventures [Member] Maximum [Member]	Aug. 06, 2012 Tenancy In Common [Member]	Apr. 13, 2011 Palm Coast [Member]	Dec. 31, 2012 Industrial Properties [Member] property	Dec. 31, 2012 Industrial Properties [Member] Unconsolidated Real Estate Joint Ventures [Member] property	Dec. 31, 2012 Shopping Centers [Member] property	Apr. 30, 2011 Shopping Centers [Member] Unconsolidated Real Estate Joint Ventures [Member] property
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures	47.80%	75.00%			50.00%	20.00%	50.00%				10.00%	7.80%	75.00%	75.00%	79.60%	50.00%				50.00%
Net basis differentials for equity method investments		$ 1,600,000	$ (7,500,000)
Impairment loss		9,982,000	55,574,000	33,317,000				96,781,000	28,776,000	231,000
Management fees revenues, related parties		6,100,000	6,000,000	5,800,000
Acquisition of unconsolidated real estate joint venture interest															29,600,000					11,600,000
Assumption of debt															24,500,000
Number of operating properties sold								2									54	19	27
Proceeds from sale of real estate properties and joint venture interests																		210,400,000
Proceeds from sale of unconsolidated joint ventures and interests, gross	$ 29,100,000
Number of operating properties acquired																			4	3