Incentive Plans (Tables)

9 Months Ended

Sep. 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:

	Nine Months Ended September 30,
(Thousands of dollars)	2020		2019
Compensation charged against income before tax benefit	$	17,542	39,884
Related income tax benefit recognized in income	2,278		6,204