Pensions (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The following table summarizes the components of net periodic pension cost under the Dutch Plan (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Service cost	$	392		$	366		$	741		$	741
Interest cost	336			268			636			543
Expected return on plan assets	(290		)	(228		)	(549		)	(460		)
Amortization of prior service cost	(18		)	(19		)	(39		)	(38		)
Amortization of actuarial loss	84			110			168			220
Net periodic pension cost	$	504		$	497		$	957		$	1,006