Retirement Plans and Other Post-Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Periodic Costs of Pension and Post Retirement Medical Benefit Plans

The following tables provide information with respect to the net periodic costs of our pension and post retirement medical benefit plans.

	Three months ended June 30
In thousands	2016			2015
Pension Benefits
Service cost	$	2,510		$	2,561
Interest cost		6,153			5,788
Expected return on plan assets		(11,275	)		(11,454	)
Amortization of prior service cost		675			761
Amortization of unrecognized loss		3,533			3,947
Net periodic benefit cost	$	1,596		$	1,603
Other Benefits
Service cost	$	250		$	303
Interest cost		456			436
Amortization of prior service cost		(46	)		(70	)
Amortization of unrecognized (gain)/loss		(327	)		15
Net periodic benefit cost	$	333		$	684
	Six months ended June 30
In thousands	2016			2015
Pension Benefits
Service cost	$	5,240		$	5,696
Interest cost		12,240			11,738
Expected return on plan assets		(22,661	)		(22,997	)
Amortization of prior service cost		1,349			1,521
Amortization of unrecognized loss		6,587			8,453
Net periodic benefit cost	$	2,755		$	4,411
Other Benefits
Service cost	$	573		$	716
Interest cost		996			999
Amortization of prior service cost		(91	)		(140	)
Amortization of unrecognized (gain)/loss		(378	)		115
Net periodic benefit cost	$	1,100		$	1,690