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Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-Based Plans, Amounts Recognized
Amounts recognized in the financial statements with respect to share-based plans are shown in the following table:
Six Months Ended
June 30,
(Thousands of dollars)20202019
Compensation charged against income before tax benefit$10,272  30,003  
Related income tax (expense) benefit recognized in income769  4,387