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

 
Pension Benefits
 
Pension Benefits
 
Three Months Ended

Six Months Ended
 
July 2,
2016
July 4,
2015

July 2,
2016
July 4,
2015
Service cost
$
685

$
1,667

 
$
1,322

$
3,345

Interest cost
1,770

2,638

 
3,515

5,285

Expected return on plan assets
(1,890
)
(3,051
)
 
(3,775
)
(6,116
)
Amortization of prior service cost
7

(20
)
 
14

(40
)
Amortization of net loss
1,166

1,284

 
2,334

2,569

Curtailment gain
—

—

 
(1,223
)
—

Settlement gain
(123
)
—

 
(123
)
—

Net pension cost
$
1,615

$
2,518

 
$
2,064

$
5,043