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Pension and Postretirement Benefits (Tables)
 9 Months Ended
Sep. 29, 2019
Retirement Benefits [Abstract]  
Pension and Postretirement Net Periodic Benefit Costs
The following provides information on the pension plans for the three and nine months ended September 29, 2019 and September 30, 2018:
 
Three months ended
 
Nine months ended
 
September 29, 2019
 
September 30, 2018
 
September 29, 2019
 
September 30, 2018
Components of net periodic benefit:
 
 
 
 
 
 
 
Service cost
$
159

 
$
150

 
$
476

 
$
450

Interest cost
736

 
700

 
2,210

 
2,099

Expected return on plan assets
(967
)
 
(1,062
)
 
(2,902
)
 
(3,186
)
Amortization of unrecognized loss
39

 
67

 
117

 
202

     Net periodic benefit
$
(33
)
 
$
(145
)
 
$
(99
)
 
$
(435
)