Pension (Tables)

6 Months Ended

Jun. 30, 2019

Compensation And Retirement Disclosure [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,
	2019			2018			2019			2018
Service cost	$	189		$	392		$	381		$	741
Interest cost		259			336			519			636
Expected return on plan assets		(229	)		(290	)		(461	)		(549	)
Amortization of prior service cost		(25	)		(18	)		(50	)		(39	)
Amortization of actuarial loss		14			84			29			168
Net periodic pension cost	$	208		$	504		$	418		$	957