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Acquisitions, Dispositions, Impairment, and Discontinued Operations (Summary Of Income From Discontinued Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Property revenues		$ 19,184	$ 57,310
Property expenses		(6,898)	(20,716)
Property revenues less property expenses		12,286	36,594
Property Management Expense		(242)	(706)
Depreciation and amortization		(4,327)	(16,138)
Income tax expense		112	0
Income from discontinued operations	$ 0	7,605	19,750
Gain on sale of discontinued operations, net of tax	$ 0	$ 375,237	$ 0

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