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Employee Benefits (Tables)
 9 Months Ended
Oct. 01, 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 
 October 1, 2016

Three Months Ended 
 October 3, 2015
Service cost
$
246

 
$
251

Interest cost on projected benefit obligation
1,179

 
1,300

Expected return on plan assets
(1,561
)
 
(1,563
)
Amortization of unrecognized loss
340

 
138

Net periodic pension cost
$
204

 
$
126

 
Nine Months Ended October 1, 2016

Nine Months Ended October 3, 2015
Service cost
$
750

 
$
851

Interest cost on projected benefit obligation
3,721

 
3,800

Expected return on plan assets
(4,663
)
 
(4,609
)
Amortization of unrecognized loss
787

 
560

Net periodic pension cost
$
595

 
$
602