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Retirement Plans (Tables)
 3 Months Ended
Mar. 29, 2020
Retirement Benefits [Abstract]  
Net Periodic Defined-Benefit Pension And Other Post-Retirement Benefit Cost
Net periodic defined-benefit pension and other post-retirement benefit (credit) cost for the three-month periods ended March 29, 2020, and March 31, 2019, consisted of the following:
 
Pension Benefits
Other Post-retirement Benefits
Three Months Ended
March 29, 2020
 
March 31, 2019
March 29, 2020
 
March 31, 2019
Service cost
$
29

 
$
28

$
2

 
$
2

Interest cost
123

 
150

7

 
9

Expected return on plan assets
(234
)
 
(228
)
(9
)
 
(9
)
Recognized net actuarial loss (gain)
79

 
70

(1
)
 
(2
)
Amortization of prior service credit
(4
)
 
(4
)
—

 
(1
)
Net periodic benefit (credit) cost
$
(7
)
 
$
16

$
(1
)
 
$
(1
)