Retirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2021

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,
	2021						2020
(In thousands)	Pension Plan		SERP		Other		Pension Plan		SERP		Other Benefits
Interest cost on benefit obligations	$	1,166	$	6	$	4	$	1,675	$	12	$	12
Expected return on plan assets	(3,596)		—		—		(3,380)		—		—
Recognized net loss (gain)	1,020		9		(20)		993		6		(8)
Net periodic benefit (income) cost	$	(1,410)	$	15	$	(16)	$	(712)	$	18	$	4

	Six months ended June 30,
	2021						2020
(In thousands)	Pension Plan		SERP		Other Benefits		Pension Plan		SERP		Other Benefits
Interest cost on benefit obligations	$	2,332	$	13	$	8	$	3,350	$	23	$	25
Expected return on plan assets	(7,191)		—		—		(6,760)		—		—
Recognized net loss (gain)	2,039		17		(40)		1,985		12		(17)
Net periodic benefit (income) cost	$	(2,820)	$	30	$	(32)	$	(1,425)	$	35	$	8