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Retirement Plans and Other Post-Retirement Benefits

9 Months Ended

Sep. 30, 2016

Compensation And Retirement Disclosure [Abstract]

Retirement Plans and Other Post-Retirement Benefits

7.	RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS

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	2016				2015
Pension Benefits
Service cost	$	2,614			$	2,850
Interest cost		6,120				5,868
Expected return on plan assets		(11,331	)			(11,498	)
Amortization of prior service cost		674				760
Amortization of unrecognized loss		3,293				4,226
Net periodic benefit cost	$	1,370			$	2,206
Other Benefits
Service cost	$	287			$	358
Interest cost		498				499
Amortization of prior service cost		(45	)			(70	)
Amortization of unrecognized (gain)/loss		(189	)			58
Net periodic benefit cost	$	551			$	845

	Nine months ended September 30
In thousands	2016				2015
Pension Benefits
Service cost	$	7,855			$	8,546
Interest cost		18,360				17,606
Expected return on plan assets		(33,992	)			(34,495	)
Amortization of prior service cost		2,023				2,281
Amortization of unrecognized loss		9,880				12,679
Net periodic benefit cost	$	4,126			$	6,617
Other Benefits
Service cost	$	860			$	1,074
Interest cost		1,494				1,498
Amortization of prior service cost		(136	)			(210	)
Amortization of unrecognized (gain)/loss		(567	)			173
Net periodic benefit cost	$	1,651			$	2,535