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Employee Benefits (Tables)
 9 Months Ended
Oct. 03, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of the components of net periodic pension cost
The following table shows the components of net periodic pension cost (in thousands):
 
Three Months Ended 
 October 3, 2015

Three Months Ended 
 October 4, 2014
Service cost
$
251

 
$
264

Interest cost on projected benefit obligation
1,300

 
1,280

Expected return on plan assets
(1,563
)
 
(1,510
)
Amortization of unrecognized loss
138

 
191

Net periodic pension cost
$
126

 
$
225

 
Nine Months Ended 
 October 3, 2015
 
Nine Months Ended 
 October 4, 2014
Service cost
$
851

 
$
792

Interest cost on projected benefit obligation
3,800

 
3,840

Expected return on plan assets
(4,609
)
 
(4,530
)
Amortization of unrecognized loss
560

 
573

Net periodic pension cost
$
602

 
$
675