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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Net pension cost
Net pension cost for the three and six months ended June 30, 2018 and July 1, 2017 includes the following components (in thousands):

 
Pension Benefits
 
Pension Benefits
 
Three Months Ended

Six Months Ended
 
June 30,
2018
July 1,
2017

June 30,
2018
July 1,
2017
Service cost
$
779

$
750

 
$
1,578

$
1,485

Interest cost
1,616

1,679

 
3,241

3,348

Expected return on plan assets
(2,059
)
(1,790
)
 
(4,123
)
(3,578
)
Amortization of prior service cost
8

9

 
17

18

Amortization of net loss
888

1,203

 
1,776

2,406

Net pension cost
$
1,232

$
1,851

 
$
2,489

$
3,679