Impairment (Schedule Of Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Asset Impairment [Line Items]
Impairment losses related to property	$ 3,100
Other		$ 335	$ 0	$ 0
Total impairment charges	$ 15,000	15,257	98	153
Equity in earnings of real estate joint ventures and partnerships, net		27,074	20,642	19,300
Net impact of impairment charges		15,278	424	1,650
Properties Held for Sale, Marketed for Sale or Sold [Member]
Asset Impairment [Line Items]
Impairment losses related to property		12,203	98	153
Land Held For Development And Undeveloped Land [Member]
Asset Impairment [Line Items]
Impairment losses related to property		2,719	0	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	1,497
Impairment in Net Income Attributable to Noncontrolling Interest [Member]
Asset Impairment [Line Items]
Net income attributable to noncontrolling interests		$ 21	$ 0	$ 0

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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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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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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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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Asset Impairment [Line Items]

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Net Impact Of Impairment Charges on Income Statement

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