Pension and Other Postretirement Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2025

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 benefit plans (OPEB):

	Three Months Ended June 30,
	Pension						OPEB
(in thousands)	2025			2024			2025			2024
Service cost	$	1,267		$	1,322		$	14		$	24
Interest cost		3,230			3,122			251			219
Expected return on plan assets		(2,933	)		(3,237	)		—			—
Amortization of prior service cost		—			5			—			—
Amortization of actuarial (gain) loss		43			20			(240	)		(330	)
Total net periodic cost	$	1,607		$	1,232		$	25		$	(87	)

	Six Months Ended June 30,
	Pension						OPEB
(in thousands)	2025			2024			2025			2024
Service cost	$	2,533		$	2,643		$	28		$	47
Interest cost		6,458			6,245			503			438
Expected return on plan assets		(5,865	)		(6,474	)		—			—
Amortization of prior service cost		—			10			—			—
Amortization of actuarial (gain) loss		86			40			(480	)		(661	)
Net periodic cost	$	3,212		$	2,464		$	51		$	(176	)