Fair Value Measurements (Details 1) (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Fair value of assets and liabilities measured on a nonrecurring basis
Fair value measurement, impairment losses on real estate	$ 59,547	$ 43,961
Total gain (loss), impairments losses on real estate	(10,522)	(8,341)
Total gain (loss), Real estate newly consolidated		1,104
Total gain (loss), Property debt (newly consolidated)	0	0
Entities Newly Consolidated [Member]
Fair value of assets and liabilities measured on a nonrecurring basis
Fair value measurement, Real estate newly consolidated		117,083
Fair value measurement, Property debt newly consolidated		$ 83,890

Fair value of real estate (held for use or held for sale) impaired during the period.

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- Definition

Gain on property debt newly consolidated.

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- Definition

Gain resulting from re-measurement of investment in real estate to fair value in connection with consolidation of an entity.

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- Definition

The charge against earnings in the period to reduce the carrying amount of real estate (held for use or held for sale) to fair value (excluding portion of impairments related to estimated costs to sell).

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- Definition

The fair value of assets acquired in noncash investing or financing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The fair value of loans assumed in noncash investing or financing activities.

+ References

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