Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2024

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 June 30,
	Pension Benefits						Other Post-Retirement Benefits
(in thousands)	2024			2023			2024			2023
Service cost	$	1,927		$	1,979		$	9		$	10
Interest cost		6,010			5,963			154			149
Expected return on plan assets		(11,906	)		(11,178	)		—			—
Amortization of net (gain) or loss and prior service costs		1,420			1,911			(185	)		(158	)
Net periodic benefit cost	$	(2,549	)	$	(1,325	)	$	(22	)	$	1

	Six Months Ended June 30,
	Pension Benefits						Other Post-Retirement Benefits
($ in thousands)	2024			2023			2024			2023
Service cost	$	3,906		$	3,959		$	18		$	(21	)
Interest cost		11,930			11,751			308			365
Expected return on plan assets		(23,823	)		(22,356	)		—			—
Amortization of net (gain) or loss and prior service costs		2,624			3,681			(370	)		(409	)
Net periodic benefit cost	$	(5,363	)	$	(2,965	)	$	(44	)	$	(65	)