Pension and Other Postretirement Plans (Tables)

9 Months Ended

Sep. 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 nine months endedSeptember 30,2018 and 2017.

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
(In thousands)		2018		2017		2018		2017
Pension Benefits
Components of net periodic benefit cost:
Service cost	$	1,431	$	1,351	$	4,292	$	4,043
Interest cost		3,215		3,168		9,645		9,481
Expected return on assets		(6,560)		(5,762)		(19,680)		(17,244)
Amortization of:
Prior service credit		(11)		(4)		(33)		(12)
Actuarial loss		1,319		1,594		3,958		4,769
Net periodic benefit (credit) cost	$	(606)	$	347	$	(1,818)	$	1,037
Postretirement Benefits
Components of net periodic benefit cost:
Service cost	$	320	$	315	$	962	$	944
Interest cost		653		678		1,959		2,034
Expected return on assets		(808)		(722)		(2,424)		(2,165)
Amortization of:
Transition obligation		1		1		2		2
Prior service credit		(667)		(667)		(2,001)		(2,001)
Actuarial loss		122		190		366		570
Net periodic benefit (credit) cost	$	(379)	$	(205)	$	(1,136)	$	(616)