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Real Estate Acquisitions And Discontinued Operations (Impact Of Disposal Of Industrial Segment On Revenues And Net Income) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income	$ 60,329	$ 3,565	$ 65,023	$ 18,989
Basic net income per share	$ 0.91	$ 0.06	$ 0.98	$ 0.30
Diluted net income per share	$ 0.91	$ 0.05	$ 0.98	$ 0.30
Industrial Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate revenues	6,053	7,854	22,503	24,252
Net income	$ 3,297	$ 2,778	$ 9,340	$ 8,215
Basic net income per share	$ 0.05	$ 0.04	$ 0.14	$ 0.13
Diluted net income per share	$ 0.05	$ 0.04	$ 0.14	$ 0.13

X

- Definition

Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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