Supplemental Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities)(Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Noncash or Part Noncash Acquisitions [Line Items]
Accrued property construction costs	$ 6,159	$ 5,751
Increase in equity for the acquisition of noncontrolling interests in consolidated real estate joint ventures	0	10,932
Exchange of interests in real estate joint ventures and partnerships for common shares	111	0
Sale Of Property And Property Interest [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Decrease in property, net	0	(126,438)
Decrease in real estate joint ventures and partnerships - investments	0	(17)
Decrease in other, net		(34)
Decrease in debt, net due to debt assumption	0	(11,069)
Decrease in security deposits	0	(459)
Decrease in noncontrolling interests	$ 0	$ (155,258)

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 5

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

Reference 2: 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 3: 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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