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Employee Benefit Plans (Tables)
 6 Months Ended
Jul. 04, 2015
Compensation and Retirement Disclosure [Abstract]  
Net pension cost
Net pension cost for the three and six months months ended July 4, 2015 and June 28, 2014 includes the following components (in thousands):

 
Pension Benefits
 
Pension Benefits
 
Three Months Ended

Six Months Ended
 
July 4,
2015
June 28,
2014

July 4,
2015
June 28,
2014
Service cost
$
1,667

$
1,496

 
$
3,345

$
2,986

Interest cost
2,638

3,353

 
5,285

6,700

Expected return on plan assets
(3,051
)
(3,612
)
 
(6,116
)
(7,220
)
Amortization of prior service cost
(20
)
4

 
(40
)
8

Amortization of net loss
1,284

520

 
2,569

1,040

Net pension cost
$
2,518

$
1,761

 
$
5,043

$
3,514