Pension and Other Postretirement Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2024

Retirement Benefits, Description [Abstract]

Components of Net Periodic Cost (Benefit)

The following table details the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefits (OPEB):

	Three Months Ended March 31,
	Pension						OPEB
(in thousands)	2024			2023			2024			2023
Service cost	$	1,321		$	1,356		$	23		$	27
Interest cost		3,123			3,138			219			294
Expected return on plan assets		(3,237	)		(3,028	)		—			—
Amortization of prior service cost		5			11			—			—
Amortization of actuarial (gain) loss		20			(21	)		(331	)		(166	)
Total net periodic cost	$	1,232		$	1,456		$	(89	)	$	155