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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 29, 2014
Compensation and Retirement Disclosure [Abstract]  
Net pension cost
Net pension cost for the three months ended March 29, 2014 and March 30, 2013 includes the following components (in thousands):

 
Pension Benefits
 
Other Post Retirement Benefits
 
Three Months Ended
 
Three Months Ended
 
March 29,
2014
March 30,
2013
 
March 29,
2014
March 30,
2013
Service cost
$
1,446

$
77

 
$
44

$
—

Interest cost
3,326

1,318

 
21

—

Expected return on plan assets
(383
)
(1,819
)
 
—

—

Amortization of prior service cost
4

15

 
—

—

Amortization of net loss
520

1,300

 
—

—

Net pension cost
$
4,913

$
891

 
$
65

$
—