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Employee Benefit Plans (Tables)
 3 Months Ended
Apr. 01, 2017
Compensation and Retirement Disclosure [Abstract]  
Net pension cost
Net pension cost for the three months ended April 1, 2017 and April 2, 2016 includes the following components (in thousands):

 
Pension Benefits
 
Three Months Ended
 
April 1,
2017
April 2,
2016
Service cost
$
735

$
637

Interest cost
1,669

1,745

Expected return on plan assets
(1,788
)
(1,885
)
Amortization of prior service cost/(benefit)
9

7

Amortization of net loss
1,203

1,168

Curtailment gain
—

(1,223
)
Net pension cost
$
1,828

$
449