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.

Reference 1: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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)(3)

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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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.

+ Details

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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

Acquisitions of operating properties.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

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- Definition

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

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No definition available.

+ Details

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Investment In Real Estate Joint Ventures And Partnerships (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended			1 Months Ended	3 Months Ended		6 Months Ended							1 Months Ended
	Feb. 29, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Apr. 30, 2011 Unconsolidated Real Estate Joint Ventures [Member]	Jun. 30, 2012 Unconsolidated Real Estate Joint Ventures [Member]	Jun. 30, 2011 Unconsolidated Real Estate Joint Ventures [Member]	Jun. 30, 2012 Unconsolidated Real Estate Joint Ventures [Member]	Jun. 30, 2011 Unconsolidated Real Estate Joint Ventures [Member]	Jun. 30, 2012 Unconsolidated Real Estate Joint Ventures [Member] Minimum [Member]	Dec. 31, 2011 Unconsolidated Real Estate Joint Ventures [Member] Minimum [Member]	Jun. 30, 2012 Unconsolidated Real Estate Joint Ventures [Member] Maximum [Member]	Dec. 31, 2011 Unconsolidated Real Estate Joint Ventures [Member] Maximum [Member]	Apr. 13, 2011 Palm Coast [Member]	Apr. 30, 2011 Shopping Centers [Member] Unconsolidated Real Estate Joint Ventures [Member] property
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Equity method investment ownership percentage	47.80%	75.00%		75.00%			50.00%					10.00%	7.80%	75.00%	75.00%	50.00%
Net basis differentials for investments		$ 5,700,000		$ 5,700,000		$ 7,500,000
Impairment loss		4,293,000	18,891,000	11,145,000	19,661,000			96,498,000	0	96,498,000	2,058,000
Management fees revenue, related parties		1,600,000	1,500,000	3,300,000	3,100,000
Proceeds from sale of unconsolidated real estate joint venture, gross	29,100,000
Gain on sale of real estate joint venture and partnership interests	3,500,000	0	0	5,562,000	0
Number of operating properties acquired																	3
Acquisition of unconsolidated real estate joint venture interests							$ 11,600,000