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Pension and Severance Benefits
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Pension and Severance Benefits
Pension and Severance Benefits
Net pension expense from the company's defined benefit and severance plans is 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)
2013
 
2012
 
2013
 
2012
Service cost
$
1,864

 
$
1,765

 
$
3,728

 
$
3,573

Interest on projected benefit obligation
1,297

 
1,208

 
2,594

 
2,499

Expected return on plan assets
(331
)
 
(326
)
 
(663
)
 
(755
)
Recognized actuarial loss
306

 
250

 
612

 
467

Amortization of prior service cost
32

 
16

 
64

 
64

Defined benefit and severance plan expense
$
3,168

 
$
2,913

 
$
6,335

 
$
5,848