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Incentive Plans (Tables)
9 Months Ended
Sep. 30, 2012
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)    2012      2011  

Compensation charged against income before tax benefit

   $ 33,952         32,885   

Related income tax benefit recognized in income

     8,007         9,883