Share Options And Awards (Status Of Unvested Restricted Share Awards) (Details) (USD $)	6 Months Ended
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Restricted Share Awards, Outstanding, January 1, 2012	407,328
Unvested Restricted Share Awards, Vested	(116,135)
Unvested Restricted Share Awards, Forfeited	(595)
Unvested Restricted Share Awards, Outstanding, June 30, 2012	535,711
Weighted Average Grant Date Fair Value, Outstanding, January 1, 2012	$ 20.43
Weighted Average Grant Date Fair Value, Vested	$ 20.19
Weighted Average Grant Date Fair Value, Forfeited	$ 24.91
Weighted Average Grant Date Fair Value, Outstanding, June 30, 2012	$ 22.99
Service-Based Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Restricted Share Awards, Granted	129,813
Weighted Average Grant Date Fair Value, Granted	$ 24.91
Market-Based Share Awards Relative To FTSE NAREIT U.S. Shopping Center Index [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Restricted Share Awards, Granted	57,650
Weighted Average Grant Date Fair Value, Granted	$ 26.45
Market-Based Share Awards Relative To Three-Year Absolute TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Restricted Share Awards, Granted	57,650
Weighted Average Grant Date Fair Value, Granted	$ 27.65

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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