Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2020

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefits Cost

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

							Other Post-
(in thousands)	Pension Benefits						Retirement Benefits
For the Three Months Ended March 31,	2020			2019			2020			2019
Service cost	$	3,275		$	2,775		$	22		$	29
Interest cost		3,782			4,863			164			128
Expected return on plan assets		(11,300	)		(11,300	)		—			—
Amortization of net loss and prior service costs		1,461			2,430			(229	)		(227	)
Net periodic benefit cost (reduction of cost)	$	(2,782	)	$	(1,232	)	$	(43	)	$	(70	)