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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Notes)

3 Months Ended

Mar. 31, 2021

The following table sets forth the components of net periodic benefit cost for our retirement and other postretirement benefit plans for the periods indicated:


	Retirement Benefits				Other Postretirement Benefits
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2021		2020		2021		2020
	(Thousands of dollars)
Components of net periodic benefit cost (income)
Service cost	$	2,076	$	2,036	$	115	$	115
Interest cost	4,220		4,574		442		442
Expected return on plan assets	(6,269)		(6,232)		(722)		(722)
Amortization of prior service cost (a)	28		28		—		—
Amortization of net loss (a)	4,913		4,571		1		1
Net periodic benefit cost (income)	$	4,968	$	4,977	$	(164)	$	(164)

(a) - These components of net periodic benefit cost (income) are recognized in accumulated other comprehensive loss and are reclassified to other expense in our Consolidated Statements of Income, with related income tax benefits of $1.1 million reclassified to income tax (expense) benefit for both the three months ended March 31, 2021 and 2020.