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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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 for the three months ended March 31, 2017 and 2016 (in thousands):
 
Three Months Ended
 
 
March 31,
 
 
2017
 
2016
 
Service cost
$
375

 
$
358

 
Interest cost
275

 
327

 
Expected return on plan assets
(233
)
 
(275
)
 
Amortization of prior service cost
(19
)
 
(19
)
 
Amortization of actuarial loss
111

 
148

 
Net periodic pension cost
$
509

 
$
539