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Pensions and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2015 and 2014 (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
Service cost
$
440

 
$
372

 
$
903

 
$
742

Interest cost
294

 
452

 
603

 
902

Expected return on plan assets
(243
)
 
(335
)
 
(499
)
 
(669
)
Amortization of transition asset
(22
)
 
(22
)
 
(44
)
 
(44
)
Amortization of prior service cost
(19
)
 
1

 
(38
)
 
3

Amortization of actuarial loss
184

 
135

 
367

 
270

Net periodic pension cost
$
634

 
$
603

 
$
1,292

 
$
1,204