EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2022

Employee Benefit Plans [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

The following tables set forth the components of net periodic benefit cost for our pension and other postemployment benefit plans for the periods indicated:

	Pension Benefits
	Three Months Ended
	March 31,
	2022		2021
	(Thousands of dollars)
Components of net periodic benefit cost (credit)
Service cost	$	3,094	$	3,453
Interest cost	7,804		7,365
Expected return on assets	(14,613)		(15,596)
Amortization of net loss	8,147		11,381
Net periodic benefit cost	$	4,432	$	6,603

	Other Postemployment Benefits
	Three Months Ended
	March 31,
	2022		2021
	(Thousands of dollars)
Components of net periodic benefit cost (credit)
Service cost	$	318	$	397
Interest cost	1,612		1,563
Expected return on assets	(3,295)		(4,202)
Amortization of unrecognized prior service cost (credit)	10		(70)
Amortization of net loss	54		93
Net periodic benefit cost (credit)	$	(1,301)	$	(2,219)