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Net Periodic Pension Cost (Tables)
 3 Months Ended
Mar. 31, 2018
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
 
March 31, 2018
 
April 1, 2017
Service cost
$
133

 
$
183

Interest cost on projected benefit obligation
963

 
1,179

Expected return on plan assets
(1,327
)
 
(1,584
)
Amortization of unrecognized loss
271

 
267

Net periodic pension cost
$
40

 
$
45