10.	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	2018			2017
Pension Benefits
Service cost	$	2,747		$	2,649
Interest cost		5,626			5,989
Expected return on plan assets		(10,722	)		(10,666	)
Amortization of prior service cost		781			708
Amortization of unrecognized loss		3,523			3,311
Total net periodic benefit cost	$	1,955		$	1,991

Other Benefits
Service cost	$	238		$	284
Interest cost		410			513
Amortization of prior service credit		(46	)		(46	)
Amortization of actuarial gain		(272	)		(46	)
Total net periodic benefit cost	$	330		$	705

	Six months ended June 30
In thousands	2018			2017
Pension Benefits
Service cost	$	5,606		$	5,370
Interest cost		11,215			11,896
Expected return on plan assets		(21,561	)		(21,497	)
Amortization of prior service cost		1,561			1,412
Amortization of unrecognized loss		6,913			6,133
Total net periodic benefit cost	$	3,734		$	3,314

Other Benefits
Service cost	$	545		$	579
Interest cost		861			998
Amortization of prior service credit		(91	)		(91	)
Amortization of actuarial gain		(345	)		(189	)
Total net periodic benefit cost	$	970		$	1,297

In the first quarter of 2018, we adopted the provisions of ASU No. 2017-07 which requires entities to present the service cost component of net periodic benefit costs in operating profit along with other employee compensation costs. All other components of net periodic benefit costs are to be presented below the determination of operating income in “Other, net”.