Supplemental Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Noncash or Part Noncash Acquisitions [Line Items]
Accrued property construction costs	$ 9,582	$ 7,895
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)		(48,140)
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
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-Section 50
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