Retirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Summary of Net Periodic Benefit Cost

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

	Three months ended September 30,
	2019								2018
(In thousands)	Pension Plan			SERP		Other Benefits			Pension Plan			SERP		Other Benefits
Interest cost on benefit obligations	$	2,001		$	16	$	22		$	1,857		$	35	$	20
Expected return on plan assets	(2,815		)	—		—			(3,178		)	—		—
Recognized net loss	1,420			4		(2		)	1,160			2,271		—
Net periodic benefit cost	$	606		$	20	$	20		$	(161	)	$	2,306	$	20

	Nine months ended September 30,
	2019								2018
(In thousands)	Pension Plan			SERP		Other Benefits			Pension Plan			SERP		Other Benefits
Interest cost on benefit obligations	$	5,956		$	48	$	64		$	5,577		$	201	$	59
Expected return on plan assets	(8,445		)	—		—			(9,538		)	—		—
Recognized net loss	4,280			11		(10		)	3,480			2,729		—
Net periodic benefit cost	$	1,791		$	59	$	54		$	(481	)	$	2,930	$	59