Impairment (Schedule Of Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Asset Impairment [Line Items]
Impairment losses related to property			$ 2,000		$ 7,800
Other	$ 0	$ 0	0	$ 95
Total impairment charges	2,398	0	2,398	15,012
Net impact of impairment charges	2,398	0	2,398	15,036
Properties Held for Sale, Under Contract for Sale or Sold [Member]
Asset Impairment [Line Items]
Impairment losses related to property	2,398	0	2,398	12,198
Land Held For Development And Undeveloped Land [Member]
Asset Impairment [Line Items]
Impairment losses related to property	0	0	0	2,719
Impairment in Net Income Attributable to Noncontrolling Interest [Member]
Asset Impairment [Line Items]
Net income attributable to noncontrolling interests	$ 0	$ 0	$ 0	$ 24

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

+ References

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Asset Impairment [Line Items]

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Net Impact Of Impairment Charges on Income Statement

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