Pension and Other Postretirement Plans (Tables)

6 Months Ended

Jun. 30, 2018

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Periodic Benefit Costs

The following table presents the components of net periodic benefit costs recognized for the three and six months endedJune 30,2018 and 2017.

		Three Months Ended				Six Months Ended
		June 30,				June 30,
(In thousands)		2018		2017		2018		2017
Pension Benefits
Components of net periodic benefit cost:
Service cost	$	1,404	$	1,360	$	2,861	$	2,692
Interest cost		3,222		3,194		6,430		6,313
Expected return on assets		(6,552)		(5,740)		(13,120)		(11,482)
Amortization of:
Prior service credit		(11)		(4)		(22)		(8)
Actuarial loss		1,341		1,711		2,639		3,175
Net periodic benefit (credit) cost	$	(596)	$	521	$	(1,212)	$	690
Postretirement Benefits
Components of net periodic benefit cost:
Service cost	$	310	$	423	$	642	$	629
Interest cost		648		912		1,306		1,356
Expected return on assets		(814)		(971)		(1,616)		(1,443)
Amortization of:
Transition obligation		-		1		1		1
Prior service credit		(667)		(898)		(1,334)		(1,334)
Actuarial loss		116		251		244		380
Net periodic benefit (credit) cost	$	(407)	$	(282)	$	(757)	$	(411)