6. Pensions

U.S. Plans

For the U.S. plans, the following table provides the components of net periodic pension costs (benefit) of the plans for the periods ended March 31, 2015 and 2014:

	Three Months Ended March 31,
	2015			2014
Service cost	$	293		$	251
Interest cost	1,153			1,199
Expected return on plan assets	(1,793		)	(1,901		)
Amortization of prior service cost	4			18
Net actuarial loss amortization	684			276
Net periodic pension cost (benefit)	$	341		$	(157	)

European Plans

For the European plans, the following table provides the components of net periodic pension costs of the plans for the periods ended March 31, 2015 and 2014:

	Three Months Ended March 31,
	2015			2014
Service cost	$	73		$	86
Interest cost	305			405
Expected return on plan assets	(414		)	(377		)
Net actuarial loss amortization	55			61
Net periodic pension cost	$	19		$	175

Multi-Employer Plan

In addition to the aforementioned European plans, the Company participates in a multi-employer plan in Europe. This multi-employer plan almost entirely relates to former employees of operations it has divested. Benefits are distributed by the multi-employer plan. As of March 31, 2015 and December 31, 2014, respectively, the Company has a $1.0 million and $0.9 million liability recorded as a component of payroll and benefits payable within its condensed consolidated balance sheets. Refer to Note 11 for further information related to this multi-employer plan.