Pension Plans and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits, Description [Abstract]

Components of Net Periodic Benefit Cost

The following table sets forth the components of net periodic benefit costs for the three months ended March 31 (dollars in thousands):

	Pension Benefits						Other Postretirement Benefits
	2022			2021			2022			2021
Service cost	$	5,771		$	6,246		$	1,063		$	1,008
Interest cost		6,907			6,580			1,440			1,376
Expected return on plan assets		(10,951	)		(9,775	)		(700	)		(675	)
Amortization of prior service cost		75			75			(275	)		(275	)
Net loss recognition		1,148			1,823			890			1,173
Net periodic benefit cost	$	2,950		$	4,949		$	2,418		$	2,607