Pension and Other Postretirement Employee Benefits (Tables)

6 Months Ended

Jun. 30, 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 June 30,
	Pension						OPEB
(in thousands)	2019			2018			2019			2018
Service cost	$	1,862		$	2,178		$	80		$	99
Interest cost		4,692			4,390			375			381
Expected return on plan assets		(5,541	)		(5,135	)		—			—
Amortization of prior service cost (credit)		53			47			(2,211	)		(2,220	)
Amortization of actuarial loss		3,321			4,144			200			301
Net periodic cost (benefit)	$	4,387		$	5,624		$	(1,556	)	$	(1,439	)
	Six Months Ended June 30,
	Pension						OPEB
(Dollars in thousands)	2019			2018			2019			2018
Service cost	$	3,883		$	4,091		$	185		$	143
Interest cost		9,231			8,304			794			700
Expected return on plan assets		(11,095	)		(9,843	)		—			—
Amortization of prior service cost (credit)		106			93			(4,422	)		(4,439	)
Amortization of actuarial loss		6,748			8,294			507			656
Net periodic cost (benefit)	$	8,873		$	10,939		$	(2,936	)	$	(2,940	)