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)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

This item represents the amount of gain (loss) arising from the disposal of an equity method investment.

+ References

No definition available.

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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))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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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 Accounting Standards Codification

-Glossary Investing Activities

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-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 4: 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.

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- Definition

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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No definition available.

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- Definition

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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No definition available.

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- Definition

Number of Real Estate Joint Ventures

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- Definition

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		3 Months Ended		9 Months Ended					3 Months Ended		9 Months Ended						0 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended
	Nov. 30, 2012 jvs	Feb. 29, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 property	Sep. 30, 2012	Dec. 31, 2012	Nov. 30, 2012 Minimum [Member]	Nov. 30, 2012 Maximum [Member]	Sep. 30, 2013 Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2012 Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2013 Unconsolidated Real Estate Joint Ventures [Member] property jvs	Sep. 30, 2012 Unconsolidated Real Estate Joint Ventures [Member]	Sep. 30, 2013 Unconsolidated Real Estate Joint Ventures [Member] Minimum [Member]	Dec. 31, 2012 Unconsolidated Real Estate Joint Ventures [Member] Minimum [Member]	Sep. 30, 2013 Unconsolidated Real Estate Joint Ventures [Member] Maximum [Member]	Dec. 31, 2012 Unconsolidated Real Estate Joint Ventures [Member] Maximum [Member]	Aug. 06, 2012 Tenancy In Common [Member]	Sep. 30, 2013 Tenancy In Common [Member] jvs	Sep. 30, 2013 Industrial Properties [Member] Unconsolidated Real Estate Joint Ventures [Member] property	Dec. 31, 2012 Industrial Properties [Member] Unconsolidated Real Estate Joint Ventures [Member] property	Sep. 30, 2013 Shopping Centers [Member] Unconsolidated Real Estate Joint Ventures [Member] property
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Ownership percentage in joint ventures		47.80%					75.00%	20.00%	50.00%	51.00%		51.00%		20.00%	10.00%	75.00%	75.00%	79.60%	10.00%
Number of real estate joint ventures	3											2							2
Net basis differentials for investments			$ 5,900,000		$ 5,900,000		$ 1,600,000
Impairment loss			2,358,000	197,000	2,579,000	9,585,000				59,000	283,000	1,887,000	96,781,000
Management fees revenue, related parties			1,200,000	1,500,000	3,800,000	4,800,000
Number of operating properties sold					18							4								2	19	2
Gain on sale of real estate joint venture and partnership interests	8,600,000	3,500,000	7,000	0	11,599,000	5,562,000														11,500,000
Acquisition of unconsolidated real estate joint venture interests												16,500,000						29,600,000
Assumption of debt																		24,500,000
Proceeds from sale of unconsolidated real estate joint venture, gross	$ 20,900,000	$ 29,100,000										$ 11,700,000							$ 8,900,000		$ 210,400,000