Pension Plans and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

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

	Pension Benefits								Other Benefits
	Three Months Ended September 30,				Nine Months Ended September 30,				Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019		2020		2019		2020		2019
	(In thousands)
Service cost	$	2,382	$	1,914	$	7,980	$	6,839	$	153	$	145	$	480	$	434
Interest cost	9,359		11,567		27,882		34,722		393		586		1,207		1,756
Expected return on plan assets	(19,368)		(17,490)		(57,943)		(52,344)		(675)		(627)		(2,019)		(1,882)
Amortization of prior service cost (credit)	877		727		2,527		2,177		(48)		(78)		(145)		(233)
Net periodic benefit (income) cost	$	(6,750)	$	(3,282)	$	(19,554)	$	(8,606)	$	(177)	$	26	$	(477)	$	75