Reitrement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2017

Retirement Benefits [Abstract]

Summary of Net Periodic Benefit Cost

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

	Three months ended June 30,
	2017							2016
(In thousands)	Pension Plan			SERP		Other Benefits		Pension Plan			SERP		Other Benefits
Service cost	$	13		$	—	$	—	$	11		$	—	$	—
Interest cost on benefit obligations	1,844			93		25		2,123			97		31
Expected return on plan assets	(3,075		)	—		—		(2,964		)	—		—
Amortization of prior service cost	—			—		—		—			—		3
Recognized net loss	1,515			212		7		1,642			83		9
Net periodic benefit cost	$	297		$	305	$	32	$	812		$	180	$	43

	Six months ended June 30,
	2017							2016
(In thousands)	Pension Plan			SERP		Other Benefits		Pension Plan			SERP		Other Benefits
Service cost	$	25		$	—	$	—	$	23		$	—	$	—
Interest cost on benefit obligations	3,657			185		50		4,221			194		62
Expected return on plan assets	(6,148		)	—		—		(5,529		)	—		—
Amortization of prior service cost	—			—		—		—			—		7
Recognized net loss	2,932			425		15		3,332			213		18
Net periodic benefit cost	$	466		$	610	$	65	$	2,047		$	407	$	87