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Employee Benefit Plans (Tables)
 3 Months Ended
Apr. 05, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Credit)

The following table summarizes the components of net periodic pension credit for the Company’s various defined benefit employee pension and postretirement plans:
 
Defined Benefit
Pension Benefits
 
Postretirement
Medical Benefits
 
Three Months Ended
 
April 5,
2020
 
March 31,
2019
 
April 5,
2020
 
March 31,
2019
 
(In thousands)
Service and administrative costs
$
1,907

 
$
1,633

 
$
18

 
$
22

Interest cost
3,144

 
4,159

 
24

 
29

Expected return on plan assets
(5,384
)
 
(6,176
)
 
(347
)
 
(294
)
Amortization of prior service costs
—

 
(39
)
 
—

 
—

Net periodic pension credit
$
(333
)
 
$
(423
)
 
$
(305
)
 
$
(243
)