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Share-Based Compensation (Schedule Of Employee Stock Purchase Plan Information) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-Based Compensation [Abstract]      
Number of ESPP shares issued 42,443 56,279 102,081
Amount of proceeds received from employees $ 1,288 $ 1,207 $ 1,233
Share-based compensation expense $ 352 $ 332 $ 385