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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Summary Of Income From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property Acquisitions Discontinued Operation And Assets Held For Sale [Abstract]
Property revenues			$ 9,206	$ 19,728	$ 23,686
Property expenses			4,696	9,170	10,335
Operating income			4,510	10,558	13,351
Depreciation and amortization			2,298	5,198	5,837
Income from discontinued operations			2,212	5,360	7,514
Gain on sale of discontinued operations, net of tax	$ 24,621	$ 9,614	$ 24,621	$ 9,614	$ 16,887

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Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal.

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