Pension and Other Postretirement Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2019

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Components of Net Periodic Cost (Benefit)

The following tables detail the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefits (OPEB):

	Three Months Ended March 31,
	Pension						OPEB
(in thousands)	2019			2018			2019			2018
Service cost	$	2,021		$	1,913		$	105		$	44
Interest cost		4,539			3,914			419			319
Expected return on plan assets		(5,554	)		(4,708	)		—			—
Amortization of prior service cost (credit)		53			46			(2,211	)		(2,219	)
Amortization of actuarial loss		3,427			4,150			307			355
Net periodic cost (benefit)	$	4,486		$	5,315		$	(1,380	)	$	(1,501	)