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Incentive Plans (Tables)
9 Months Ended
Sep. 30, 2011
Share-Based Plans, Amounts Recognized

Amounts recognized in the financial statements with respect to share-based plans are as follows.

 

     Nine Months Ended
September 30,
 
(Thousands of dollars)    2011      2010  

Compensation charged against income before tax benefit

   $ 32,885         31,594   

Related income tax benefit recognized in income

     9,883         9,144