Pension and Other Postretirement Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2023

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 September 30,
	Pension						OPEB
(in thousands)	2023			2022			2023			2022
Service cost	$	1,355		$	1,652		$	27		$	79
Interest cost		3,139			2,611			294			228
Expected return on plan assets		(3,028	)		(2,259	)		—			—
Amortization of prior service cost		10			19			—			155
Amortization of actuarial (gain) loss		(21	)		1,150			(166	)		(96	)
Total net periodic cost	$	1,455		$	3,173		$	155		$	366

	Nine Months Ended September 30,
	Pension						OPEB
(in thousands)	2023			2022			2023			2022
Service cost	$	4,066		$	5,153		$	82		$	237
Interest cost		9,414			8,034			881			686
Expected return on plan assets		(9,081	)		(7,662	)		—			—
Amortization of prior service cost		32			55			—			467
Amortization of actuarial (gain) loss		(63	)		4,252			(498	)		(286	)
Net periodic cost before pension settlement charge		4,368			9,832			465			1,104
Pension settlement charge		—			14,165			—			—
Net periodic cost	$	4,368		$	23,997		$	465		$	1,104