Retirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Summary of Net Periodic Benefit Cost

The following table summarizes the components of net periodic benefit (income) cost:

	Three months ended June 30,
	2022						2021
(In thousands)	Pension Plan		SERP		OPEB		Pension Plan		SERP		OPEB
Service cost	$	—	$	—	$	9	$	—	$	—	$	—
Interest cost	1,380		17		213		1,166		6		4
Expected return on plan assets	(3,668)		—		—		(3,596)		—		—
Amortization of actuarial loss (gain)	423		6		(19)		1,020		9		(20)
Net periodic benefit (income) cost	$	(1,865)	$	23	$	203	$	(1,410)	$	15	$	(16)

	Six months ended June 30,
	2022						2021
(In thousands)	Pension Plan		SERP		Other Benefits		Pension Plan		SERP		Other Benefits
Service cost	$	—	$	—	$	15	$	—	$	—	$	—
Interest cost	2,757		32		357		2,332		13		8
Expected return on plan assets	(7,337)		—		—		(7,191)		—		—
Amortization of actuarial loss (gain)	845		13		(37)		2,039		17		(40)
Net periodic benefit (income) cost	$	(3,735)	$	45	$	335	$	(2,820)	$	30	$	(32)