Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities)(Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Noncash or Part Noncash Acquisitions [Line Items]
Accrued property construction costs	$ 6,931	$ 5,279
Increase in equity for the acquisition of noncontrolling interests in consolidated real estate joint ventures	0	1,668
Reduction of debt service guaranty liability	0	(22,925)
Property Acquisitions And Investments In Unconsolidated Real Estate Joint Ventures [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase (decrease) in debt	0	24,383
Increase (decrease) in property, net	(2,532)	(3,812)
Increase (decrease) in security deposits	1,116	22
Increase (decrease) in noncontrolling interests	968	0
Decrease in real estate joint ventures and partnerships - investments	0	(153)
Sale Of Property And Property Interest [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase (decrease) in debt	(3,366)	0
Increase (decrease) in property, net	(2,855)	0
Increase (decrease) in security deposits	(11)	0
Increase (decrease) in noncontrolling interests	(95)	0
Decrease in real estate joint ventures and partnerships - investments	(95)	0
Decrease in restricted deposits and mortgage escrows	(204)	0
Consoldiation Of Joint Ventures [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase (decrease) in property, net	0	32,307
Decrease in real estate joint ventures and partnerships - investments	0	(10,092)
Decrease in notes receivable from real estate joint ventures and partnerships	$ 0	$ (21,872)

Future cash outflow to pay for construction in progress expenditures that have occurred.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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-Name Accounting Standards Codification

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Security deposits related to sales in noncash investing and financing activities.

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