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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [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
 
Nine Months Ended
 
September 30, 2017
 
October 1, 2016
 
September 30, 2017
 
October 1, 2016
Service cost
$
133

 
$
246

 
$
499

 
$
750

Interest cost on projected benefit obligation
1,153

 
1,179

 
3,509

 
3,721

Expected return on plan assets
(1,684
)
 
(1,561
)
 
(4,852
)
 
(4,663
)
Amortization of unrecognized loss
260

 
340

 
796

 
787

Net periodic pension (credit) cost
$
(138
)
 
$
204

 
$
(48
)
 
$
595