Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Impairment (Schedule Of Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Asset Impairment [Line Items]
Other			$ 95	$ 0
Total impairment charges			15,012	43
Equity in earnings of real estate joint ventures and partnerships, net	$ 5,219	$ 4,373	17,966	15,111
Net impact of impairment charges			15,036	369
Properties Held for Sale, Marketed for Sale or Sold [Member]
Asset Impairment [Line Items]
Impairment losses related to property			12,198	43
Land Held For Development And Undeveloped Land [Member]
Asset Impairment [Line Items]
Impairment losses related to property			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	326
Impairment in Net Income Attributable to Noncontrolling Interest [Member]
Asset Impairment [Line Items]
Net income attributable to noncontrolling interests			$ 24	$ 0