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Employee Benefits (Tables)
 6 Months Ended
Jul. 04, 2015
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 
 July 4, 2015

Three Months Ended 
 July 5, 2014
Service cost
$
300

 
$
264

Interest cost on projected benefit obligation
1,250

 
1,280

Expected return on plan assets
(1,523
)
 
(1,510
)
Amortization of unrecognized loss
211

 
191

Net periodic pension cost
$
238

 
$
225

 
Six Months Ended 
 July 4, 2015
 
Six Months Ended 
 July 5, 2014
Service cost
$
600

 
$
528

Interest cost on projected benefit obligation
2,500

 
2,560

Expected return on plan assets
(3,046
)
 
(3,020
)
Amortization of unrecognized loss
422

 
382

Net periodic pension cost
$
476

 
$
450