Pensions (Tables)

9 Months Ended

Sep. 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						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Service cost	$	359		$	401		$	1,100		$	1,142
Interest cost	308			295			944			838
Expected return on plan assets	(266		)	(249		)	(815		)	(709		)
Amortization of prior service cost	(19		)	(20		)	(58		)	(58		)
Amortization of actuarial loss	84			110			252			330
Net periodic pension cost	$	466		$	537		$	1,423		$	1,543