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Employee Benefits (Tables)
9 Months Ended
Oct. 04, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic pension cost for pension plans
The following table shows the components of net periodic pension cost (in thousands):
 
Three Months Ended 
 October 4, 2014

Three Months Ended 
 September 28, 2013
Service cost
$
264

 
$
548

Interest cost on projected benefit obligation
1,280

 
1,188

Expected return on plan assets
(1,510
)
 
(1,306
)
Amortization of unrecognized loss
191

 
718

Net periodic pension cost
$
225

 
$
1,148

 
Nine Months Ended 
 October 4, 2014

Nine Months Ended 
 September 28, 2013
Service cost
$
792

 
$
1,644

Interest cost on projected benefit obligation
3,840

 
3,563

Expected return on plan assets
(4,530
)
 
(3,918
)
Amortization of unrecognized loss
573

 
2,154

Net periodic pension cost
$
675

 
$
3,443