Supplemental Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Dec. 23, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Noncash or Part Noncash Acquisitions [Line Items]
Accrued property construction costs		$ 5,175	$ 5,811	$ 7,535
(Decrease) Increase in equity for the acquisition of noncontrolling interests in consolidated real estate joint ventures		(16,177)	394	1,668
Reduction of debt service guaranty liability		(335)	0	(22,925)
Property Acquisitions And Investments In Unconsolidated Real Estate Joint Ventures [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase in property, net		43,122	16,665	4,749
Decrease in notes receivable from real estate joint ventures and partnerships		(8,750)	0	0
Increase (decrease) in real estate joint ventures and partnerships - investments		1,746	(3,825)	490
Increase in restricted deposits and mortgage escrows		0	395	0
Increase in debt, net		60,515	40,644	0
Increase in security deposits		187	1,332	87
Increase in noncontrolling interests		16,177	968	9,949
Sale Of Property And Property Interest [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Decrease in property, net		0	(2,855)	0
Decrease in real estate joint ventures and partnerships - investments		0	(95)	0
Decrease in restricted deposits and mortgage escrows		0	(204)	0
Decrease in debt, net due to debt assumption		0	(3,366)	0
Decrease in security deposits		0	(11)	0
Decrease in noncontrolling interests		0	(95)	0
Consolidation Of Joint Ventures [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase in property, net		60,992	0	32,307
Decrease in notes receivable from real estate joint ventures and partnerships	(54,800)	(54,838)	0	(21,872)
Increase (decrease) in real estate joint ventures and partnerships - investments		(11,518)	0	(10,092)
Increase in security deposits		$ 164	$ 0	$ 0