Earnings Per Share (Components Of Earnings Per Common Share - Basic And Diluted) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Continuing Operations:
Income from continuing operations	$ 31,803	$ 21,996	$ 54,930	$ 62,974
Gain on sale of property	1,748	265	1,911	407
Net income attributable to noncontrolling interests	(1,561)	(920)	(3,118)	(1,993)
Dividends on preferred shares	(2,710)	(5,313)	(5,420)	(12,753)
Redemption costs of preferred shares	0	(15,702)	0	(17,944)
Income from continuing operations attributable to common shareholders – basic and diluted	29,280	326	48,303	30,691
Discontinued Operations:
Income from discontinued operations	3,433	81,917	44,924	85,614
Net (income) loss attributable to noncontrolling interests	(27)	(36,822)	52	(37,216)
Income from discontinued operations attributable to common shareholders - basic and diluted	$ 3,406	$ 45,095	$ 44,976	$ 48,398
Denominator:
Weighted average shares outstanding - basic	121,497	121,286	121,449	121,172
Effect of dilutive securities:
Share options and awards	1,337	1,288	1,292	1,223
Weighted average shares outstanding - diluted	122,834	122,574	122,741	122,395

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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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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Amount of income (loss) from continuing operations attributable to the noncontrolling interest. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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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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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items, which is apportioned to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This item includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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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 amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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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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Represents original issuance costs on preferred shares that were recorded in additional paid-in-capital.

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