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Retirement Plans and Other Post-Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2017

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		2017					2016
Pension Benefits
Service cost		$	2,695				$	2,614
Interest cost			5,929					6,120
Expected return on plan assets			(10,749	)				(11,331	)
Amortization of prior service cost			708					674
Amortization of unrecognized loss			3,078					3,293
Total net periodic benefit cost		$	1,661				$	1,370

Other Benefits
Service cost		$	289				$	287
Interest cost			499					498
Amortization of prior service credit			(45	)				(45	)
Amortization of actuarial gain			(94	)				(189	)
Total net periodic benefit cost		$	649				$	551

		Nine months ended September 30
In thousands		2017					2016
Pension Benefits
Service cost		$	8,065				$	7,855
Interest cost			17,825					18,360
Expected return on plan assets			(32,246	)				(33,992	)
Amortization of prior service cost			2,120					2,023
Amortization of unrecognized loss			9,211					9,880
Total net periodic benefit cost		$	4,975				$	4,126

Other Benefits
Service cost		$	868				$	860
Interest cost			1,497					1,494
Amortization of prior service credit			(136	)				(136	)
Amortization of actuarial gain			(283	)				(567	)
Total net periodic benefit cost		$	1,946				$	1,651