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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 29, 2018
Retirement Benefits [Abstract]  
Net pension cost
Net pension cost for the three and nine months ended September 29, 2018 and September 30, 2017 includes the following components (in thousands):
 
Pension Benefits
 
Pension Benefits
 
Three Months Ended

Nine Months Ended
 
September 29,
2018
September 30,
2017

September 29,
2018
September 30,
2017
Service cost
$
762

$
759

 
$
2,340

$
2,244

Interest cost
1,603

1,672

 
4,844

5,020

Expected return on plan assets
(2,053
)
(1,799
)
 
(6,176
)
(5,377
)
Amortization of prior service cost
9

9

 
26

27

Amortization of net loss
888

1,204

 
2,664

3,610

Net pension cost
$
1,209

$
1,845

 
$
3,698

$
5,524