Retirement Plans (Tables)

6 Months Ended

Jun. 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 June 30,	2020			2019			2020			2019
Service cost	$	3,208		$	2,735		$	28		$	22
Interest cost		4,641			4,661			107			164
Expected return on plan assets		(12,797	)		(11,300	)		—			—
Amortization of net loss and prior service costs		1,853			2,552			(141	)		(228	)
Net periodic benefit cost (reduction of cost)	$	(3,095	)	$	(1,352	)	$	(6	)	$	(42	)

							Other Post-
(in thousands)	Pension Benefits						Retirement Benefits
For the Six Months Ended June 30,	2020			2019			2020			2019
Service cost	$	6,483		$	5,510		$	50		$	51
Interest cost		8,423			9,524			271			292
Expected return on plan assets		(24,097	)		(22,600	)		—			—
Amortization of net loss and prior service costs		3,314			4,982			(370	)		(455	)
Net periodic benefit cost (reduction of cost)	$	(5,877	)	$	(2,584	)	$	(49	)	$	(112	)