Retirement Benefits

6 Months Ended

Jun. 30, 2016

Retirement Benefits [Abstract]

Retirement Benefits

12.RETIREMENT BENEFITS

The Company maintains both qualified and non-qualified defined benefit pension plans and a retiree health plan for its U.S. employees employed prior to April 1, 2010.

Net periodic benefit cost for U.S. employees included the following components for the periods indicated:

Pension Benefits	Three Months Ended						Six Months Ended
	June 30,						June 30,
(Dollars in thousands)	2016			2015			2016			2015
Service cost	$	2,896		$	3,255		$	5,793		$	6,195
Interest cost		2,361			2,711			4,722			5,168
Expected return on plan assets		(2,484	)		(2,903	)		(4,968	)		(5,806	)
Amortization of prior service cost		-			6			-			11
Amortization of net (income) loss		2,014			2,261			4,028			4,512
Net periodic benefit cost	$	4,787		$	5,330		$	9,575		$	10,080

Other Benefits	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in thousands)	2016		2015		2016		2015
Service cost	$	438	$	599	$	876	$	1,000
Interest cost		296		395		592		658
Amortization of net (income) loss		48		210		96		421
Net periodic benefit cost	$	782	$	1,204	$	1,564	$	2,079

The Company did not make any contributions to the qualified pension benefit plan for the three and six months ended June 30, 2016 and 2015.