Impairment (Schedule Of Impairment Charges) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Asset Impairment [Line Items]
Total impairment charges	$ 24,153	$ 74	$ 10,120
Equity in Earnings of Real Estate Joint Ventures and Partnerships, net	39,206	20,769	25,070
Net impact of impairment charges	24,153	3,127	10,103
Properties Held for Sale, Under Contract for Sale or Sold [Member]
Asset Impairment [Line Items]
Impairment losses related to property	24,109		9,969
Land Held For Development And Undeveloped Land [Member]
Asset Impairment [Line Items]
Impairment losses related to property	$ 44	74	151
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
Impairment in Net Income Attributable to Noncontrolling Interest [Member]
Asset Impairment [Line Items]
Net income attributable to noncontrolling interests		$ (17)	$ (17)

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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Amount, before tax, of income (loss) attributable to noncontrolling interest. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments.

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