PENSION

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
	March 31,
	2018			2017
Service cost	$	349		$	375
Interest cost	300			275
Expected return on plan assets	(259		)	(233		)
Amortization of prior service cost	(21		)	(19		)
Amortization of actuarial loss	84			111
Net periodic pension cost	$	453		$	509

Upon adoption of ASU 2017-07 ("Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost") on January 1, 2018, the components of net periodic benefit cost other than the service cost component are included in the line item "other (income) expense, net" in the income statement. During the three months ended March 31, 2018, we contributed $1.2 million to fund the estimated 2018 premiums on investment contracts held by the Dutch Plan.