Retirement Plans (Tables)

9 Months Ended

Sep. 30, 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 September 30,	2020			2019			2020			2019
Service cost	$	3,207		$	2,735		$	28		$	22
Interest cost		3,892			4,659			106			165
Expected return on plan assets		(12,047	)		(11,299	)		—			—
Amortization of net loss and prior service costs		1,854			2,553			(142	)		(229	)
Net reduction of periodic benefit cost	$	(3,094	)	$	(1,352	)	$	(8	)	$	(42	)

							Other Post-
(in thousands)	Pension Benefits						Retirement Benefits
For the Nine Months Ended September 30,	2020			2019			2020			2019
Service cost	$	9,690		$	8,245		$	78		$	73
Interest cost		12,315			14,183			377			457
Expected return on plan assets		(36,144	)		(33,899	)		—			—
Amortization of net loss and prior service costs		5,168			7,535			(512	)		(684	)
Net reduction of periodic benefit cost	$	(8,971	)	$	(3,936	)	$	(57	)	$	(154	)