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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Net Periodic Defined-Benefit Pension And Other Post-Retirement Benefit Cost
Net periodic defined-benefit pension and other post-retirement benefit cost (credit) for the three-month periods ended March 31, 2019, and April 1, 2018, consisted of the following:
 
Pension Benefits
Other Post-retirement Benefits
Three Months Ended
March 31, 2019
 
April 1, 2018
March 31, 2019
 
April 1, 2018
Service cost
$
28

 
$
46

$
2

 
$
3

Interest cost
150

 
114

9

 
8

Expected return on plan assets
(228
)
 
(179
)
(9
)
 
(9
)
Recognized net actuarial loss (gain)
70

 
96

(2
)
 
(1
)
Amortization of prior service credit
(4
)
 
(11
)
(1
)
 
(1
)
Net periodic benefit cost (credit)
$
16

 
$
66

$
(1
)
 
$
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