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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 29, 2013
Employee Benefit Plans [Abstract]  
Net pension cost
Net pension cost for the three and six months ended June 29, 2013 and June 30, 2012 includes the following components (in thousands):

 
Three Months Ended
Six Months Ended
 
June 29,
2013
June 30,
2012
June 29,
2013
June 30,
2012
Service cost
$
76

$
82

$
153

$
163

Interest cost
1,318

1,363

2,636

2,726

Expected return on plan assets
(1,819
)
(1,678
)
(3,638
)
(3,355
)
Amortization of prior service cost
15

22

30

44

Amortization of net loss
1,300

1,189

2,600

2,378

Net pension cost
$
890

$
978

$
1,781

$
1,956