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Pensions and Other Post-employment Benefits (Tables)
 3 Months Ended
Mar. 29, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
The following is a summary of the first quarter 2013 and 2012 net periodic benefit cost for the domestic pension plans (which include the defined benefit plan and the supplemental retirement plans) and the domestic retiree medical plan.
 
 
Pension Benefits
 
Other Benefits
 
 
First Quarter Ended
 
First Quarter Ended
 
 
Mar. 29,
 
Mar. 30,
 
Mar. 29,
 
Mar. 30,
(Thousands)
 
2013
 
2012
 
2013
 
2012
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
Service cost
 
$
2,356

 
$
1,966

 
$
76

 
$
93

Interest cost
 
2,353

 
2,341

 
311

 
360

Expected return on plan assets
 
(2,996
)
 
(2,926
)
 
—

 
—

Amortization of prior service cost (benefit)
 
(86
)
 
(118
)
 
29

 
—

Amortization of net loss
 
1,933

 
1,402

 
—

 
—

Net periodic benefit cost
 
$
3,560

 
$
2,665

 
$
416

 
$
453