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Employee Benefits (Tables)
 6 Months Ended
Jul. 02, 2016
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 2, 2016

Three Months Ended 
 July 4, 2015
Service cost
$
252

 
$
300

Interest cost on projected benefit obligation
1,271

 
1,250

Expected return on plan assets
(1,551
)
 
(1,523
)
Amortization of unrecognized loss
223

 
211

Net periodic pension cost
$
195

 
$
238

 
Six Months Ended July 2, 2016

Six Months Ended July 4, 2015
Service cost
$
504

 
$
600

Interest cost on projected benefit obligation
2,542

 
2,500

Expected return on plan assets
(3,102
)
 
(3,046
)
Amortization of unrecognized loss
447

 
422

Net periodic pension cost
$
391

 
$
476