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Net Periodic Pension Cost (Tables)
 6 Months Ended
Jun. 29, 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
 
Six Months Ended
(In thousands)
June 29, 2019
 
June 30, 2018
 
June 29, 2019
 
June 30, 2018
Service cost
$
48

 
$
133

 
$
161

 
$
266

Interest cost on projected benefit obligation
973

 
963

 
2,018

 
1,926

Expected return on plan assets
(1,295
)
 
(1,327
)
 
(2,489
)
 
(2,654
)
Amortization of unrecognized loss
279

 
271

 
580

 
542

Net periodic pension cost
$
5

 
$
40

 
$
270

 
$
80