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Impairment (Schedule Of Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Asset Impairment [Line Items]
Impairment losses related to property					$ 7,800
Other				$ 0	335	$ 0
Total impairment charges	$ 7,700	$ 2,400	$ 15,000	10,120	15,257	98
Equity in earnings of real estate joint ventures and partnerships, net				25,070	27,074	20,642
Net impact of impairment charges				10,103	15,278	424
Properties Held for Sale, Under Contract for Sale or Sold [Member]
Asset Impairment [Line Items]
Impairment losses related to property				9,969	12,203	98
Land Held For Development And Undeveloped Land [Member]
Asset Impairment [Line Items]
Impairment losses related to property				151	2,719	0
Impairment in Equity in Earnings (Losses) of Real Estate Joint Venture And Partnership Net [Member]
Asset Impairment [Line Items]
Equity in earnings of real estate joint ventures and partnerships, net				0	0	326
Impairment in Net Income Attributable to Noncontrolling Interest [Member]
Asset Impairment [Line Items]
Net income attributable to noncontrolling interests				$ (17)	$ 21	$ 0