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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2015
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, 2015 and 2014 (in thousands):
 
Three Months Ended
 
 
March 31,
 
 
2015
 
2014
 
Service cost
$
463

 
$
370

 
Interest cost
309

 
450

 
Expected return on plan assets
(256
)
 
(334
)
 
Amortization of transition asset
(22
)
 
(22
)
 
Amortization of prior service cost
(19
)
 
2

 
Amortization of actuarial loss
183

 
135

 
Net periodic pension cost
$
658

 
$
601