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Incentive Plans (Tables)
3 Months Ended
Mar. 31, 2012
Share-Based Plans, Amounts Recognized

Amounts recognized in the Consolidated Statements of Income with respect to share-based plans are as follows:

 

     Three Months Ended
March 31
 
(Thousands of dollars)    2012      2011  

Compensation charged against income before tax benefit

   $ 13,042         10,226   

Related income tax benefit recognized in income

     3,978         2,989