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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 and 2015 (in thousands):
 
Three Months Ended
 
 
March 31,
 
 
2016
 
2015
 
Service cost
$
358

 
$
463

 
Interest cost
327

 
309

 
Expected return on plan assets
(275
)
 
(256
)
 
Amortization of transition asset
—

 
(22
)
 
Amortization of prior service cost
(19
)
 
(19
)
 
Amortization of actuarial loss
148

 
183

 
Net periodic pension cost
$
539

 
$
658