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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 29, 2019
Retirement Benefits [Abstract]  
Net pension cost
Net pension cost for the three and six months ended June 29, 2019 and June 30, 2018 includes the following components (in thousands):
 
Pension Benefits
 
Pension Benefits
 
Three Months Ended

Six Months Ended
 
June 29,
2019
June 30,
2018

June 29,
2019
June 30,
2018
Service cost
$
683

$
779

 
$
1,361

$
1,578

Interest cost
1,714

1,616

 
3,424

3,241

Expected return on plan assets
(1,817
)
(2,059
)
 
(3,636
)
(4,123
)
Amortization of prior service cost
9

8

 
18

17

Amortization of net loss
1,147

888

 
2,293

1,776

Net pension cost
$
1,736

$
1,232

 
$
3,460

$
2,489