Supplemental Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Noncash or Part Noncash Acquisitions [Line Items]
Accrued property construction costs	$ 5,367	$ 7,060
Consolidation of real estate joint venture:
Increase in equity associated with deferred compensation plan (see Note 1)	44,758
Decrease in equity associated with deferred compensation plan (see Note 1)		(47,334)
Property Acquisitions And Investments In Unconsolidated Real Estate Joint Ventures [Member]
Consolidation of real estate joint venture:
Increase in property, net	0	6,549
Consolidation of Joint Venture [Member]
Consolidation of real estate joint venture:
Increase in property, net	0	58,665
Increase in restricted deposits and mortgage escrows	0	30
Increase in debt, net	0	48,727
Increase in security deposits	$ 0	$ 169

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
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