Pension Benefits (Tables)

9 Months Ended

Sep. 30, 2020

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Components of the net periodic benefit cost for the pension plans [Table Text Block]

Components of Net Periodic Benefit Cost for the Pension Plans

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2020		2019		2020		2019
	(in thousands)
Components of net periodic benefit cost:
Service cost	$	1,129	$	1,395	$	3,387	$	4,186
Interest cost	590		699		1,768		2,094
Expected return on plan assets that reduces periodic pension benefit cost	(434)		(393)		(1,301)		(1,180)
Amortization of prior service cost	4		4		13		13
Amortization of net actuarial loss	238		239		713		718
Settlements	1,282		—		1,282		—
Net periodic benefit cost	$	2,809	$	1,944	$	5,862	$	5,831