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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
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