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Employee Benefit Plans (Tables)
3 Months Ended
Apr. 04, 2015
Compensation and Retirement Disclosure [Abstract]  
Net pension cost
Net pension cost for the three months ended April 4, 2015 and March 29, 2014 includes the following components (in thousands):

 
Pension Benefits
 
Three Months Ended
 
April 4,
2015
March 29,
2014
Service cost
$
1,678

$
1,490

Interest cost
2,647

3,347

Expected return on plan assets
(3,065
)
(3,608
)
Amortization of prior service cost
(20
)
4

Amortization of net loss
1,285

520

Net pension cost
$
2,525

$
1,753