Pensions and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Pensions and Other Postretirement Benefits

Defined Benefit Plan

We provide a non-contributory defined benefit pension plan for substantially all of our Dutch employees ("Dutch Plan") who were hired prior to 2007. The pension benefit is based on years of service and final pay or career average pay, depending on when the employee began participating. The benefits earned by the employees are immediately vested.

The following table summarizes the components of net periodic pension cost under the Dutch Plan for the three months ended March 31, 2016 and 2015 (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Service cost	$	358		$	463
Interest cost	327			309
Expected return on plan assets	(275		)	(256		)
Amortization of transition asset	—			(22		)
Amortization of prior service cost	(19		)	(19		)
Amortization of actuarial loss	148			183
Net periodic pension cost	$	539		$	658

During the three months ended March 31, 2016, we contributed approximately $1.0 million to fund the estimated 2016 premiums on investment contracts held by the Dutch Plan.