Pension Benefits (Tables)

3 Months Ended

Mar. 31, 2020

Defined Benefit Plan [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 March 31,
	2020			2019
	(in thousands)
Components of net periodic benefit cost:
Service cost	$	1,395		$	1,683
Interest cost	698			656
Expected return on plan assets that reduces periodic pension benefit cost	(393		)	(466		)
Amortization of prior service cost	4			4
Amortization of net actuarial loss	240			332
Net periodic benefit cost	$	1,944		$	2,209