Supplemental Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Noncash or Part Noncash Acquisitions [Line Items]
Accrued property construction costs	$ 11,135	$ 7,728	$ 5,738
Increase in equity for the acquisition of noncontrolling interests in consolidated real estate joint ventures	0	0	2,139
Reduction of debt service guaranty liability	(3,245)	(2,980)	(2,710)
Increase (decrease) in equity associated with deferred compensation plan (see Note 1)	0	44,758
Increase (decrease) in equity associated with deferred compensation plan (see Note 1)			(44,758)
Property Acquisitions And Investments In Unconsolidated Real Estate Joint Ventures [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase in property, net	0	0	10,573
Decrease in real estate joint ventures and partnerships - investments	0	0	(2,315)
Consolidation of Joint Venture [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase in property, net	0	0	58,665
Increase in security deposits	0	0	169
Increase in debt, net	$ 0	$ 0	$ 48,727

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

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