Pension and Other Postretirement Employee Benefits (Tables)

6 Months Ended

Jun. 30, 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 June 30,
	Pension						OPEB
(in thousands)	2024			2023			2024			2023
Service cost	$	1,322		$	1,355		$	24		$	28
Interest cost		3,122			3,137			219			293
Expected return on plan assets		(3,237	)		(3,025	)		—			—
Amortization of prior service cost		5			11			—			—
Amortization of actuarial (gain) loss		20			(21	)		(330	)		(166	)
Total net periodic cost	$	1,232		$	1,457		$	(87	)	$	155

	Six Months Ended June 30,
	Pension						OPEB
(in thousands)	2024			2023			2024			2023
Service cost	$	2,643		$	2,711		$	47		$	55
Interest cost		6,245			6,275			438			587
Expected return on plan assets		(6,474	)		(6,053	)		—			—
Amortization of prior service cost		10			22			—			—
Amortization of actuarial (gain) loss		40			(42	)		(661	)		(332	)
Net periodic cost	$	2,464		$	2,913		$	(176	)	$	310