Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Calculation Of Basic And Diluted Net Earnings Per Common Share) (Details)

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Earnings Per Share (Calculation Of Basic And Diluted Net Earnings Per Common Share) (Details) (USD $)
In Thousands, except Share data
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Earnings Per Share [Abstract]        
Earnings from continuing operations, net of tax $ 28,987 $ 22,402 $ 81,106 $ 65,483
Discontinued operations, net of tax   260   3,954
Net earnings $ 28,987 $ 22,662 $ 81,106 $ 69,437
Weighted average number of common shares outstanding 50,345,512 49,238,406 50,089,845 48,552,135
Common stock equivalents (as determined by applying the treasury stock method) 2,274,838 1,699,951 2,231,061 1,640,055
Weighted average number of common shares and potential dilutive common shares outstanding 52,620,350 50,938,357 52,320,906 50,192,190
Continuing operations, Basic $ 0.58 $ 0.46 $ 1.62 $ 1.35
Discontinued operations, Basic       $ 0.08
Earnings per common share, Basic $ 0.58 $ 0.46 $ 1.62 $ 1.43
Continuing operations, Diluted $ 0.55 $ 0.44 $ 1.55 $ 1.30
Discontinued operations, Diluted       $ 0.08
Earnings per common share, Diluted $ 0.55 $ 0.44 $ 1.55 $ 1.38
Anti-dilutive stock options, restricted stock and restricted stock units excluded from the calculation of diluted earnings per common share 69,359 1,931,808 97,004 1,975,387