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Employee Benefits (Tables)
 3 Months Ended
Apr. 01, 2017
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
 
April 1, 2017
 
April 2, 2016
Service cost
$
183

 
$
252

Interest cost on projected benefit obligation
1,178

 
1,271

Expected return on plan assets
(1,584
)
 
(1,551
)
Amortization of unrecognized loss
268

 
223

Net periodic pension cost
$
45

 
$
195