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Net Periodic Pension Cost (Tables)
 9 Months Ended
Sep. 29, 2018
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
 
Nine Months Ended
(In thousands)
September 29, 2018
 
September 30, 2017
 
September 29, 2018
 
September 30, 2017
Service cost
$
133

 
$
133

 
$
399

 
$
499

Interest cost on projected benefit obligation
963

 
1,153

 
2,889

 
3,509

Expected return on plan assets
(1,327
)
 
(1,684
)
 
(3,981
)
 
(4,852
)
Amortization of unrecognized loss
271

 
260

 
813

 
796

Net periodic pension cost (benefit)
$
40

 
$
(138
)
 
$
120

 
$
(48
)