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Impairment (Schedule Of Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Asset Impairment [Line Items]
Other				$ 0	$ 0	$ 335
Total impairment charges	$ 3,100	$ 7,700	$ 2,400	74	10,120	15,257
Equity in earnings of real estate joint ventures and partnerships, net				20,769	25,070	27,074
Net impact of impairment charges				3,127	10,103	15,278
Properties Held for Sale, Under Contract for Sale or Sold [Member]
Asset Impairment [Line Items]
Impairment losses related to property				0	9,969	12,203
Land Held For Development And Undeveloped Land [Member]
Asset Impairment [Line Items]
Impairment losses related to property				74	151	2,719
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				3,070	0	0
Impairment in Net Income Attributable to Noncontrolling Interest [Member]
Asset Impairment [Line Items]
Net income attributable to noncontrolling interests				$ (17)	$ (17)	$ 21