Retirement Benefits

6 Months Ended

Jun. 30, 2015

Retirement Benefits [Abstract]

Retirement Benefits

14.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)	2015			2014			2015			2014
Service cost	$	3,255		$	2,461		$	6,195		$	4,921
Interest cost		2,711			2,541			5,168			5,083
Expected return on plan assets		(2,903	)		(2,823	)		(5,806	)		(5,646	)
Amortization of prior service cost		6			12			11			25
Amortization of net (income) loss		2,261			1,092			4,512			2,183
Net periodic benefit cost	$	5,330		$	3,283		$	10,080		$	6,566

Other Benefits	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in thousands)	2015		2014		2015		2014
Service cost	$	599	$	407	$	1,000	$	814
Interest cost		395		342		658		684
Amortization of net (income) loss		210		82		421		164
Net periodic benefit cost	$	1,204	$	831	$	2,079	$	1,662

The Company did not make any contributions to the qualified pension benefit plan for the three and six months ended June 30, 2015 and 2014.