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Pension and Severance Benefits
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Pension and Severance Benefits
Pension and Severance Benefits
Net pension expense from our defined benefit and severance plans are primarily comprised of severance plans covering Central American employees and consists of the following:
 
Quarter Ended June 30,
 
Six Months Ended June 30,
(In thousands)
2015
 
2014
 
2015
 
2014
Service cost
$
1,957

 
$
1,855

 
$
3,915

 
$
3,710

Interest on projected benefit obligation
1,294

 
1,440

 
2,641

 
2,830

Expected return on plan assets
(169
)
 
(341
)
 
(497
)
 
(671
)
Recognized actuarial loss
283

 
264

 
535

 
532

Amortization of prior service cost
32

 
32

 
64

 
64

Defined benefit and severance plan expense
$
3,397

 
$
3,250

 
$
6,658

 
$
6,465