EMPLOYEE BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 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				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(Thousands of dollars)
Components of net periodic benefit cost (credit)
Service cost	$	2,341	$	3,453	$	8,027	$	10,359
Interest cost	9,654		7,365		26,495		22,095
Expected return on assets	(14,642)		(15,596)		(43,887)		(46,788)
Amortization of unrecognized prior service cost	93		—		155		—
Amortization of net loss	2,224		11,381		14,569		34,143
Net periodic benefit cost (credit)	$	(330)	$	6,603	$	5,359	$	19,809

	Other Postemployment Benefits
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
	(Thousands of dollars)
Components of net periodic benefit cost (credit)
Service cost	$	318	$	397	$	954	$	1,191
Interest cost	1,612		1,563		4,836		4,689
Expected return on assets	(3,295)		(4,202)		(9,885)		(12,606)
Amortization of unrecognized prior service cost (credit)	10		(70)		30		(210)
Amortization of net loss	54		93		162		279
Net periodic benefit cost (credit)	$	(1,301)	$	(2,219)	$	(3,903)	$	(6,657)