Retirement Plans and Other Post-Retirement Benefits

6 Months Ended

Jun. 30, 2017

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 June 30
In thousands	2017			2016
Pension Benefits
Service cost	$	2,649		$	2,510
Interest cost		5,989			6,153
Expected return on plan assets		(10,666	)		(11,275	)
Amortization of prior service    cost		708			675
Amortization of unrecognized    loss		3,311			3,533
Total net periodic benefit cost	$	1,991		$	1,596
Other Benefits
Service cost	$	284		$	250
Interest cost		513			456
Amortization of prior    service credit		(46	)		(46	)
Amortization of    actuarial gain		(46	)		(327	)
Total net periodic    benefit cost	$	705		$	333

	Six months ended June 30
In thousands	2017			2016
Pension Benefits
Service cost	$	5,370		$	5,240
Interest cost		11,896			12,240
Expected return on plan assets		(21,497	)		(22,661	)
Amortization of prior service    cost		1,412			1,349
Amortization of unrecognized    loss		6,133			6,587
Total net periodic benefit cost	$	3,314		$	2,755
Other Benefits
Service cost	$	579		$	573
Interest cost		998			996
Amortization of prior    service credit		(91	)		(91	)
Amortization of    actuarial gain		(189	)		(378	)
Total net periodic    benefit cost	$	1,297		$	1,100