Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

The following tables provide the components of net periodic benefit cost for the pension, supplemental executive retirement and other postretirement benefit plans:

	Three Months Ended June 30,
(In thousands)	Pension and Supplemental Executive Retirement Plans						Other Postretirement Benefits
	2016			2015			2016			2015
Service cost	$	2,402		$	2,680		$	201		$	214
Interest cost	4,024			4,016			180			171
Expected return on plan assets	(4,865		)	(5,259		)	(1,221		)	(1,247		)
Recognized net actuarial loss (gain)	1,567			1,533			—			(53		)
Amortization of prior service cost	(171		)	(211		)	(1,663		)	(1,663		)
Net periodic benefit cost (benefit)	$	2,957		$	2,759		$	(2,503	)	$	(2,578	)

	Six Months Ended June 30,
(In thousands)	Pension and Supplemental Executive Retirement Plans						Other Postretirement Benefits
	2016			2015			2016			2015
Service cost	$	4,565		$	5,128		$	376		$	416
Interest cost	7,953			7,924			352			349
Expected return on plan assets	(9,754		)	(10,554		)	(2,443		)	(2,495		)
Recognized net actuarial loss (gain)	2,928			2,742			—			(88		)
Amortization of prior service cost	(343		)	(422		)	(3,325		)	(3,325		)
Net periodic benefit cost (benefit)	$	5,349		$	4,818		$	(5,040	)	$	(5,143	)