Pension Plans and Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Defined Benefit Plan [Abstract]

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost included in net income are as follows:

	Pension Benefits						Other Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
	2018			2017			2018			2017
	(In thousands)
Service cost	$	2,413		$	2,151		$	165		$	154
Interest cost	12,343			13,513			549			540
Expected return on plan assets	(21,625		)	(20,837		)	(634		)	(595		)
Amortization of prior service cost (credit)	550			525			(45		)	(79		)
Net periodic benefit (income) cost	$	(6,319	)	$	(4,648	)	$	35		$	20