Pensions and Other Postretirement Benefits

9 Months Ended

Sep. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Pensions and Other Postretirement Benefits

Defined Benefit Plan

We provide a noncontributory defined benefit pension plan covering 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 (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Service cost	$	401		$	364		$	1,142		$	1,097
Interest cost	295			332			838			1,001
Expected return on plan assets	(249		)	(279		)	(709		)	(841		)
Amortization of prior service cost	(20		)	(20		)	(58		)	(58		)
Amortization of actuarial loss	110			148			330			444
Net periodic pension cost	$	537		$	545		$	1,543		$	1,643

During the nine months ended September 30, 2017, we contributed $1.6 million to fund the estimated 2017 premiums on investment contracts held by the Dutch Plan.