Interim Financial Statements (Computation Of Components Of Earnings Per Common Share - Basic And Diluted) (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interim Financial Statements [Abstract]
(Loss) income from continuing operations	$ (23,493)	$ 17,328	$ (8,925)	$ 36,661
Gain on Sale of Property	6	126	239	689
Net loss (income) attributable to noncontrolling interests	2,738	(1,712)	410	(3,093)
Preferred share dividends	(8,869)	(8,869)	(26,607)	(26,607)
(Loss) income from continuing operations attributable to common shareholders - basic and diluted	(29,618)	6,873	(34,883)	7,650
(Loss) income from discontinued operations attributable to common shareholders - basic and diluted	$ (12,471)	$ 1,787	$ (7,145)	$ 5,683
Weighted average shares outstanding - basic	120,413	119,978	120,301	119,899
Share options and awards		839		811
Weighted average shares outstanding - diluted	120,413	120,817	120,301	120,710

This element represents the amount of gain (loss) on sale of properties during the reporting period gross of the applicable income taxes realized.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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