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Pension Plan and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of components of net periodic benefit costs for the pension plans and other postretirement benefits

The following table lists components of net periodic benefit costs for the pension plans and other postretirement benefits. The data listed under “pension plan” includes the qualified pension plan and the non-qualified supplemental executive retirement plan. The data listed under “other benefits” is for all other postretirement benefits.


	Three Months Ended March 31
	Pension Plan				Other Benefits
	2021		2020		2021		2020
Service cost	$	9,010	$	8,811	$	1,611	$	2,106
Interest cost	5,319		6,433		805		1,210
Expected return on plan assets	(9,866)		(8,265)		(2,192)		(1,811)
Amortization of prior service cost	253		1,057		49		49
Recognized net actuarial loss	1,924		3,196		(110)		14
Net periodic benefit cost	$	6,640	$	11,232	$	163	$	1,568