Pensions and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Plan Cost

The composition of the net periodic benefit cost for the six months ended June 30, 2019 and 2018, was as follows:

	Pension plans		Other postretirement benefits
(in thousands)	2019	2018	2019	2018
Components of net periodic benefit cost:
Service cost	$1,261	$1,391	$95	$116
Interest cost	3,578	3,621	1,057	1,013
Expected return on assets	(4,102)	(4,470)	—	—
Curtailment gain	—	(518)	—	—
Amortization of prior service cost/(credit)	34	17	(2,244)	(2,244)
Amortization of net actuarial loss	1,125	1,110	1,114	1,478
Net periodic benefit cost	$1,896	$1,151	$22	$363