Pension and Postretirement Benefit Obligations (Tables)

6 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Summary of Components of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost

The components of total pension expense were as follows:

	Second Quarter				First Half
(in thousands)	2023		2022		2023		2022
Service cost	$	1,100	$	1,861	$	2,199	$	3,721
Interest cost	3,508		2,659		7,016		5,318
Expected return on plan assets	(2,914)		(2,036)		(5,828)		(4,071)
Recognized net actuarial loss	973		988		1,946		1,977
Amortization of prior service cost	4		—		8		—
Net periodic pension cost	2,671		3,472		5,341		6,945
Settlement expense	39,777		—		39,777		—
Total pension expense	$	42,448	$	3,472	$	45,118	$	6,945

The components of net periodic postretirement benefit cost were as follows:

	Second Quarter				First Half
(in thousands)	2023		2022		2023		2022
Service cost	$	294	$	384	$	588	$	767
Interest cost	697		475		1,395		949
Recognized net actuarial loss	—		91		—		183
Net periodic postretirement benefit cost	$	991	$	950	$	1,983	$	1,899