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Net Periodic Pension Cost (Tables)
 3 Months Ended
Mar. 30, 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 (benefit):
 
Three Months Ended
(In thousands)
March 30, 2019
 
March 31, 2018
Service cost
$
113

 
$
133

Interest cost on projected benefit obligation
1,045

 
963

Expected return on plan assets
(1,194
)
 
(1,327
)
Amortization of unrecognized loss
300

 
271

Net periodic pension cost (benefit)
$
264

 
$
40