Retirement Benefit Plans

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

Retirement Benefit Plans

Retirement Benefit Plans

Defined benefit pension and other postretirement benefits

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

	Three months ended September 30,
	2017								2016
(In thousands)	Pension Plan			SERP		Other Benefits			Pension Plan			SERP		Other Benefits
Service cost	$	12		$	—	$	—		$	11		$	—	$	—
Interest cost on benefit obligations	1,829			96		19			2,110			98		32
Expected return on plan assets	(3,074		)	—		—			(3,067		)	—		—
Amortization of prior service cost	—			—		—			—			—		4
Recognized net loss	1,466			136		(15		)	1,666			106		8
Net periodic benefit cost	$	233		$	232	$	4		$	720		$	204	$	44

	Nine months ended September 30,
	2017							2016
(In thousands)	Pension Plan			SERP		Other Benefits		Pension Plan			SERP		Other Benefits
Service cost	$	37		$	—	$	—	$	34		$	—	$	—
Interest cost on benefit obligations	5,486			281		69		6,331			292		94
Expected return on plan assets	(9,222		)	—		—		(8,596		)	—		—
Amortization of prior service cost	—			—		—		—			—		11
Recognized net loss	4,398			561		—		4,998			319		26
Net periodic benefit cost	$	699		$	842	$	69	$	2,767		$	611	$	131