Defined Pension Plans (Tables)

3 Months Ended

Mar. 31, 2017

Retirement Benefits [Abstract]

Schedule of Net Periodic Pension Costs

Disclosure information is based on a measurement date of December 31 of the corresponding year. The following table represents the components of the net periodic pension costs:

	Estimated			Actual
(In thousands)	2017			2016
Service cost – benefits earned during the year	$	3,805		$	3,559
Interest cost on projected benefit obligations		3,587			3,505
Expected return on plan assets		(4,680	)		(4,734	)
Net amortization		1,328			1,259
Net periodic pension cost	$	4,040		$	3,589

Schedule of Unfunded Supplemental Executive Retirement Plan

The following table represents the components of the net periodic pension costs for 2016 and an estimate for 2017:

	Estimated		Actual
(In thousands)	2017		2016
Service cost – benefits earned during the year	$	143	$	133
Interest cost on projected benefit obligation		361		367
Net amortization		323		295
Net periodic pension cost	$	827	$	795