Pension and Other Postretirement Employee Benefits (Tables)

6 Months Ended

Jun. 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 June 30,
	Pension						OPEB
(in thousands)	2023			2022			2023			2022
Service cost	$	1,355		$	1,652		$	28		$	79
Interest cost		3,137			2,611			293			229
Expected return on plan assets		(3,025	)		(2,258	)		—			—
Amortization of prior service cost		11			18			—			156
Amortization of actuarial (gain) loss		(21	)		1,148			(166	)		(95	)
Total net periodic cost	$	1,457		$	3,171		$	155		$	369

	Six Months Ended June 30,
	Pension						OPEB
(in thousands)	2023			2022			2023			2022
Service cost	$	2,711		$	3,501		$	55		$	158
Interest cost		6,275			5,423			587			458
Expected return on plan assets		(6,053	)		(5,403	)		-			—
Amortization of prior service cost		22			36			-			312
Amortization of actuarial (gain) loss		(42	)		3,102			(332	)		(190	)
Net periodic cost before pension settlement charge		2,913			6,659			310			738
Pension settlement charge		—			14,165			—			—
Net periodic cost	$	2,913		$	20,824		$	310		$	738