Benefit Plans

The Corporation sponsors several qualified and nonqualified pension and other postretirement plans for certain of its employees. The net periodic pension cost is based on estimated values provided by an outside actuary. The components of net periodic benefit cost are as follows:



	Pension Benefits
	Three Months Ended June 30,						Six Months Ended June 30,
(In thousands)	2016			2015			2016			2015
Service cost	$	198		$	207		$	396		$	415
Interest cost	3,649			3,517			7,298			7,035
Expected return on assets	(3,788		)	(3,902		)	(7,576		)	(7,804		)
Amortization of unrecognized prior service costs	75			570			150			1,140
Amortization of actuarial losses/(gains)	830			1,057			1,660			2,113
Net periodic pension cost	$	964		$	1,449		$	1,928		$	2,899



	Postretirement Benefits
	Three Months Ended June 30,						Six Months Ended June 30,
(In thousands)	2016			2015			2016			2015
Service cost	$	26		$	41		$	52		$	83
Interest cost	64			144			127			288
Amortization of unrecognized prior service costs	(636		)	(160		)	(1,271		)	(319		)
Amortization of actuarial losses/(gains)	245			81			490			163
Net periodic postretirement cost	$	(301	)	$	106		$	(602	)	$	215

For further information on the Corporation's employee benefit plans, refer to Note 13 (Benefit Plans) to the consolidated financial statements in the 2015 Form 10-K.