Pension and Postretirement Benefit Obligations (Tables)

6 Months Ended

Jun. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension Cost

The components of net periodic pension cost were as follows:

	Second Quarter						First Half
(in thousands)	2019			2018			2019			2018
Service cost	$	1,206		$	1,413		$	2,413		$	2,825
Interest cost		3,062			2,856			6,125			5,712
Expected return on plan assets		(2,574	)		(3,852	)		(5,148	)		(7,704	)
Recognized net actuarial loss		900			933			1,801			1,866
Amortization of prior service cost		7			6			12			12
Net periodic pension cost	$	2,601		$	1,356		$	5,203		$	2,711

Components of Net Periodic Postretirement Benefit Cost

The components of net periodic postretirement benefit cost were as follows:

	Second Quarter						First Half
(in thousands)	2019			2018			2019			2018
Service cost	$	389		$	503		$	778		$	1,005
Interest cost		693			696			1,386			1,392
Recognized net actuarial loss		195			499			391			998
Amortization of prior service cost		(322	)		(462	)		(646	)		(924	)
Net periodic postretirement benefit cost	$	955		$	1,236		$	1,909		$	2,471