Employee benefit plans

9 Months Ended

Sep. 30, 2014

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Pension and other postretirement benefit plans

Employee benefit plans

The Company has noncontributory defined benefit pension plans and other postretirement benefit plans for certain eligible employees. Components of net periodic benefit cost for the Company's pension and other postretirement benefit plans were as follows:

							Other
							Postretirement
	Pension Benefits						Benefits
Three Months Ended September 30,	2014			2013			2014			2013
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	32		$	39		$	379		$	419
Interest cost	4,420			4,062			919			804
Expected return on assets	(5,304		)	(4,979		)	(1,154		)	(1,086		)
Amortization of prior service cost (credit)	18			18			(348		)	(364		)
Amortization of net actuarial loss	1,217			1,793			162			327
Net periodic benefit cost (credit), including amount capitalized	383			933			(42		)	100
Less amount capitalized	27			157			(65		)	47
Net periodic benefit cost	$	356		$	776		$	23		$	53

							Other
							Postretirement
	Pension Benefits						Benefits
Nine Months Ended September 30,	2014			2013			2014			2013
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	96		$	116		$	1,138		$	1,257
Interest cost	13,265			12,186			2,701			2,411
Expected return on assets	(15,913		)	(14,937		)	(3,463		)	(3,258		)
Amortization of prior service cost (credit)	54			54			(1,044		)	(1,092		)
Amortization of net actuarial loss	3,651			5,373			486			1,405
Net periodic benefit cost (credit), including amount capitalized	1,153			2,792			(182		)	723
Less amount capitalized	195			425			(55		)	137
Net periodic benefit cost (credit)	$	958		$	2,367		$	(127	)	$	586

In addition to the qualified plan defined pension benefits reflected in the table, the Company has unfunded, nonqualified benefit plans for executive officers and certain key management employees that generally provide for defined benefit payments at age 65 following the employee's retirement or to their beneficiaries upon death for a 15-year period. The Company's net periodic benefit cost for this plan for the three and nine months ended September 30, 2014, was $1.7 million and $5.0 million, respectively. The Company's net periodic benefit cost for this plan for the three and nine months ended September 30, 2013, was $1.8 million and $5.5 million, respectively.