Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Components of Net Periodic Benefits Cost

The following tables show the components of net periodic benefit cost included in expense for the periods indicated.

	Three Months Ended September 30,
	Pension Benefits						Other Post-Retirement Benefits
(in thousands)	2023			2022			2023			2022
Service cost	$	1,979		$	2,855		$	8		$	25
Interest cost		6,052			3,756			160			77
Expected return on plan assets		(11,177	)		(11,714	)		—			—
Amortization of net (gain) or loss and prior service costs		1,981			450			(243	)		(139	)
Net periodic benefit cost	$	(1,165	)	$	(4,653	)	$	(75	)	$	(37	)

	Nine Months Ended September 30,
	Pension Benefits						Other Post-Retirement Benefits
($ in thousands)	2023			2022			2023			2022
Service cost	$	5,938		$	8,584		$	(13	)	$	75
Interest cost		17,803			10,881			525			230
Expected return on plan assets		(33,533	)		(34,900	)		—			—
Amortization of net (gain) or loss and prior service costs		5,662			2,380			(652	)		(417	)
Net periodic benefit cost	$	(4,130	)	$	(13,055	)	$	(140	)	$	(112	)