Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2022

Compensation And Retirement Disclosure [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.

							Other Post-
(in thousands)	Pension Benefits						Retirement Benefits
For the Three Months Ended March 31,	2022			2021			2022			2021
Service cost	$	2,800		$	3,450		$	25		$	27
Interest cost		3,417			3,460			77			99
Expected return on plan assets		(11,475	)		(12,058	)		—		—
Amortization of net (gain) or loss and prior service costs		1,348			2,100			(139	)		(146	)
Net reduction of periodic benefit cost	$	(3,910	)	$	(3,048	)	$	(37	)	$	(20	)