Annual report pursuant to Section 13 and 15(d)

Earnings Per Share (Schedule Of Earnings Per Share, Basic And Diluted) (Details)

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Earnings Per Share (Schedule Of Earnings Per Share, Basic And Diluted) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Earnings Per Share [Abstract]      
Weighted average common shares outstanding, used in computing basic earnings per share 33,808 33,725 33,846
Effect of dilutive stock options and restricted stock units 396 367 135
Weighted-average common shares outstanding, used in computing diluted earnings per share 34,204 34,092 33,981
Basic $ 3.06 $ 2.28 $ 1.98
Diluted $ 3.03 $ 2.26 $ 1.97