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Share-Based Compensation (Summary Of ESPP Annual Offerings) (Details) (ESPP [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares purchased	71,000	75,000	74,000
Per common share purchase Price	$ 13.83	$ 12.07	$ 9.01
Amount expensed under ESPP	$ 282,000	$ 317,000	$ 393,000
Common shares date of issue	Jan. 4, 2012	Jan. 6, 2011	Jan. 4, 2010

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

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