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Net Periodic Pension Cost (Tables)
 9 Months Ended
Sep. 28, 2019
Retirement Benefits [Abstract]  
Schedule of net periodic pension cost for pension plans
The following table shows the components of our net periodic pension cost:
 
Three Months Ended
 
Nine Months Ended
 
September 28, 2019
 
September 29, 2018
 
September 28, 2019
 
September 29, 2018
 
(in thousands)
Service cost
$
29

 
$
133

 
$
190

 
$
399

Interest cost on projected benefit obligation
881

 
963

 
2,899

 
2,889

Expected return on plan assets
(1,339
)
 
(1,327
)
 
(3,828
)
 
(3,981
)
Amortization of unrecognized loss
278

 
271

 
857

 
813

Net periodic pension cost (benefit)
$
(151
)
 
$
40

 
$
118

 
$
120