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Employee Benefit Plans (Tables)
 9 Months Ended
Oct. 01, 2016
Compensation and Retirement Disclosure [Abstract]  
Net pension cost
Net pension cost for the three and nine months months ended October 1, 2016 and October 3, 2015 includes the following components (in thousands):

 
Pension Benefits
 
Pension Benefits
 
Three Months Ended

Nine Months Ended
 
October 1,
2016
October 3,
2015

October 1,
2016
October 3,
2015
Service cost
$
599

$
1,633

 
$
1,921

$
4,978

Interest cost
1,702

2,622

 
5,217

7,907

Expected return on plan assets
(1,886
)
(3,053
)
 
(5,661
)
(9,169
)
Amortization of prior service cost/(benefit)
8

(21
)
 
22

(61
)
Amortization of net loss
1,168

1,286

 
3,502

3,855

Curtailment gain
(62
)
—

 
(1,285
)
—

Settlement gain
—

—

 
(123
)
—

Net pension cost
$
1,529

$
2,467

 
$
3,593

$
7,510