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Employee Benefit Plans (Tables)
 3 Months Ended
Apr. 02, 2016
Compensation and Retirement Disclosure [Abstract]  
Net pension cost
Net pension cost for the three months ended April 2, 2016 and April 4, 2015 includes the following components (in thousands):

 
Pension Benefits
 
Three Months Ended
 
April 2,
2016
April 4,
2015
Service cost
$
637

$
1,678

Interest cost
1,745

2,647

Expected return on plan assets
(1,885
)
(3,065
)
Amortization of prior service cost
7

(20
)
Amortization of net loss
1,168

1,285

Curtailment gain
(1,223
)
—

Net pension cost
$
449

$
2,525