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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 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- and six-month periods ended June 30, 2019, and July 1, 2018, consisted of the following:
 
Pension Benefits
Other Post-retirement Benefits
Three Months Ended
June 30, 2019
 
July 1, 2018
June 30, 2019
 
July 1, 2018
Service cost
$
28

 
$
44

$
2

 
$
2

Interest cost
150

 
140

9

 
8

Expected return on plan assets
(228
)
 
(228
)
(9
)
 
(10
)
Recognized net actuarial loss (gain)
70

 
93

(2
)
 
(1
)
Amortization of prior service credit
(5
)
 
(11
)
(1
)
 
(1
)
Net periodic benefit cost (credit)
$
15

 
$
38

$
(1
)
 
$
(2
)
Six Months Ended
 
 
 
 
 
 
Service cost
$
56

 
$
90

$
4

 
$
5

Interest cost
300

 
254

18

 
16

Expected return on plan assets
(456
)
 
(407
)
(18
)
 
(19
)
Recognized net actuarial loss (gain)
140

 
189

(4
)
 
(2
)
Amortization of prior service credit
(9
)
 
(22
)
(2
)
 
(2
)
Net periodic benefit cost (credit)
$
31

 
$
104

$
(2
)
 
$
(2
)