Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities)(Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Noncash or Part Noncash Acquisitions [Line Items]
Accrued property construction costs	$ 7,454	$ 11,460
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	40,644	24,383
Increase (decrease) in property, net	16,665	(3,812)
Increase (decrease) in security deposits	1,332	22
Increase (decrease) in restricted deposits and mortgage escrows	395	0
Increase (decrease) in noncontrolling interests	968	0
Decrease in real estate joint ventures and partnerships - investments	(3,825)	(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 restricted deposits and mortgage escrows	(204)	0
Increase (decrease) in noncontrolling interests	(95)	0
Decrease in real estate joint ventures and partnerships - investments	(95)	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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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ 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

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

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: 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.

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