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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 30, 2019
Retirement Benefits [Abstract]  
Net pension cost
Net pension cost for the three ended March 30, 2019 and March 31, 2018 includes the following components (in thousands):
 
Pension Benefits
 
Three Months Ended
 
March 30,
2019
March 31,
2018
Service cost
$
678

$
799

Interest cost
1,710

1,625

Expected return on plan assets
(1,819
)
(2,064
)
Amortization of prior service cost
9

9

Amortization of net loss
1,146

888

Net pension cost
$
1,724

$
1,257