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Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2012
Share-Based Plans, Amounts Recognized

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

 

     Six Months Ended
June 30,
 

(Thousands of dollars)

   2012      2011  

Compensation charged against income before tax benefit

   $ 20,994         22,123   

Related income tax benefit recognized in income

     6,453         6,607