Retirement Plans and Other Post-Retirement Benefits

3 Months Ended

Mar. 31, 2018

Compensation And Retirement Disclosure [Abstract]

Retirement Plans and Other Post-Retirement Benefits

9. 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 March 31
In thousands	2018			2017
Pension Benefits
Service cost	$	2,859		$	2,721
Interest cost		5,589			5,907
Expected return on plan assets		(10,839	)		(10,831	)
Amortization of prior service    cost		780			704
Amortization of unrecognized    loss		3,390			2,822
Total net periodic benefit cost	$	1,779		$	1,323
Other Benefits
Service cost	$	307		$	295
Interest cost		451			485
Amortization of prior    service credit		(45	)		(45	)
Amortization of    actuarial gain		(73	)		(143	)
Total net periodic    benefit cost	$	640		$	592

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”.