Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of cost of pension plans

The cost of our pension plans are as follows:

(in thousands)	Three months ended September 30,						Nine months ended September 30,
	2016			2015			2016			2015
Service cost for benefits earned	$	7,050		$	7,608		$	21,150		$	22,824
Interest cost on benefits obligation	8,281			7,689			24,844			23,067
Expected return on plan assets	(9,880		)	(8,980		)	(29,640		)	(26,940		)
Prior service cost amortization	174			168			522			502
Net actuarial loss amortization	2,029			3,507			6,084			10,523
Pension plan cost (1)	$	7,654		$	9,992		$	22,960		$	29,976

(1) Pension plan costs represent the total cost before reimbursements from the Exchange and EFL.