Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Noncash or Part Noncash Acquisitions [Line Items]
Exchange of interests in real estate joint ventures and partnerships for common shares			$ 0
Accrued property construction costs	5,811	7,535	6,878
Increase (decrease) in equity for the acquisition of noncontrolling interests in consolidated real estate joint ventures	394	1,668	(879)
Reduction of debt service guaranty liability (See Note 7)	0	(22,925)	0
Property Acquisitions And Investments In Unconsolidated Real Estate Joint Ventures [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase (decrease) in property, net	16,665	4,749	18,376
Increase (decrease) in real estate joint ventures and partnerships - investments	(3,825)	490	0
Increase (decrease) in restricted deposits and mortgage escrows	395	0	498
Increase (decrease) in debt, net	40,644	0	27,302
Increase (decrease) in security deposits	1,332	87	302
Increase (decrease) in noncontrolling interests	968	9,949	0
Sale Of Property And Property Interest [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase (decrease) in property, net	(2,855)	0	(37,969)
Increase (decrease) in real estate joint ventures and partnerships - investments	(95)	0	9,840
Increase (decrease) in restricted deposits and mortgage escrows	(204)	0	0
Increase (decrease) in debt, net	(3,366)	0	(28,129)
Increase (decrease) in security deposits	(11)	0	0
Increase (decrease) in noncontrolling interests	(95)	0	0
Consolidation Of Joint Ventures [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase (decrease) in property, net	0	32,307	32,940
Increase (decrease) in real estate joint ventures and partnerships - investments	0	(10,092)	0
Decrease in notes receivable from real estate joint ventures and partnerships	0	(21,872)	(123,912)
Increase in other assets	0	0	148,255
Increase (decrease) in debt, net	0	0	101,741
Decrease in other liabilities, net	0	0	(21,858)
Increase (decrease) in noncontrolling interests	0	0	(18,573)
Noncontrolling Interests [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Exchange of interests in real estate joint ventures and partnerships for common shares	$ 0	$ 0	$ 746

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

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

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