Incentive Plans (Tables)

3 Months Ended

Mar. 31, 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:

	Three Months Ended March 31,
(Thousands of dollars)	2020			2019
Compensation charged against income before tax benefit	$	553		15,514
Related income tax (expense) benefit recognized in income	(592		)	2,342