Retirement Plans and Other Post-Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2015

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 September 30
In thousands	2015			2014
Pension Benefits
Service cost	$	2,850		$	2,602
Interest cost		5,868			6,216
Expected return on plan assets		(11,498	)		(10,969	)
Amortization of prior service cost		760			827
Amortization of unrecognized loss		4,226			2,977
Net periodic benefit cost	$	2,206		$	1,653
Other Benefits
Service cost	$	358		$	614
Interest cost		499			597
Amortization of prior service cost		(70	)		(72	)
Amortization of unrecognized loss		58			129
Net periodic benefit cost	$	845		$	1,268

	Nine months ended September 30
In thousands	2015			2014
Pension Benefits
Service cost	$	8,546		$	7,810
Interest cost		17,606			18,696
Expected return on plan assets		(34,495	)		(32,907	)
Amortization of prior service cost		2,281			2,482
Amortization of unrecognized loss		12,679			8,931
Net periodic benefit cost	$	6,617		$	5,012
Other Benefits
Service cost	$	1,074		$	1,844
Interest cost		1,498			1,793
Amortization of prior service cost		(210	)		(216	)
Amortization of unrecognized loss		173			387
Net periodic benefit cost	$	2,535		$	3,808