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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 28, 2019
Retirement Benefits [Abstract]  
Net pension cost
Net pension cost for the three and nine months ended September 28, 2019 and September 29, 2018 includes the following components (in thousands):
 
Pension Benefits
 
Pension Benefits
 
Three Months Ended

Nine Months Ended
 
September 28,
2019
September 29,
2018

September 28,
2019
September 29,
2018
Service cost
$
664

$
762

 
$
2,025

$
2,340

Interest cost
1,698

1,603

 
5,122

4,844

Expected return on plan assets
(1,816
)
(2,053
)
 
(5,452
)
(6,176
)
Amortization of prior service cost
9

9

 
27

26

Amortization of net loss
1,146

888

 
3,439

2,664

Net pension cost
$
1,701

$
1,209

 
$
5,161

$
3,698