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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 30, 2013
Employee Benefit Plans [Abstract]  
Net pension cost
Net pension cost for the three months ended March 30, 2013 and March 31, 2012 includes the following components (in thousands):

 
Three Months Ended
 
March 30,
2013
March 31,
2012
Service cost
$
77

$
81

Interest cost
1,318

1,363

Expected return on plan assets
(1,819
)
(1,677
)
Amortization of prior service cost
15

22

Amortization of net loss
1,300

1,189

Net pension cost
$
891

$
978