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Pension and Severance Benefits (Tables)
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures
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 September 30,
 
Nine Months Ended September 30,
(In thousands)
2013
 
2012
 
2013
 
2012
Service cost
$
1,864

 
$
1,787

 
$
5,592

 
$
5,360

Interest on projected benefit obligation
1,300

 
1,247

 
3,894

 
3,746

Expected return on plan assets
(333
)
 
(378
)
 
(996
)
 
(1,133
)
Recognized actuarial loss
310

 
242

 
922

 
709

Amortization of prior service cost
32

 
32

 
96

 
96

Defined benefit and severance plan expense
$
3,173

 
$
2,930

 
$
9,508

 
$
8,778