Impairment (Schedule Of Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Asset Impairment [Line Items]
Other	$ 0	$ 0	$ 95	$ 0
Total impairment charges	26	0	15,012	43
Equity in earnings of real estate joint ventures and partnerships, net	7,430	6,645	12,747	10,738
Net impact of impairment charges	14	0	15,036	369
Properties Held for Sale, Marketed for Sale or Sold [Member]
Asset Impairment [Line Items]
Impairment losses related to property	26	0	12,198	43
Land Held For Development And Undeveloped Land [Member]
Asset Impairment [Line Items]
Impairment losses related to property	0	0	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	0	326
Impairment in Net Income Attributable to Noncontrolling Interest [Member]
Asset Impairment [Line Items]
Net (loss) income attributable to noncontrolling interests	$ (12)	$ 0	$ 24	$ 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
-Topic 360
-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 of Income (Loss) attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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