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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net pension cost
Net pension cost for the three months ended March 31, 2018 and April 1, 2017 includes the following components (in thousands):

 
Pension Benefits
 
Three Months Ended
 
March 31,
2018
April 1,
2017
Service cost
$
799

$
735

Interest cost
1,625

1,669

Expected return on plan assets
(2,064
)
(1,788
)
Amortization of prior service cost
9

9

Amortization of net loss
888

1,203

Net pension cost
$
1,257

$
1,828