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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
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 nine-month periods ended September 30, 2018, and October 1, 2017, consisted of the following:
 
Pension Benefits
Other Post-retirement Benefits
Three Months Ended
September 30, 2018
 
October 1,
2017
September 30, 2018
 
October 1,
2017
Service cost
$
45

 
$
42

$
3

 
$
3

Interest cost
140

 
113

8

 
8

Expected return on plan assets
(225
)
 
(169
)
(10
)
 
(8
)
Recognized net actuarial loss (gain)
94

 
86

(1
)
 
(1
)
Amortization of prior service credit
(11
)
 
(17
)
(1
)
 
(1
)
Net periodic benefit cost (credit)
$
43

 
$
55

$
(1
)
 
$
1

Nine Months Ended
 
 
 
 
 
 
Service cost
$
135

 
$
126

$
8

 
$
9

Interest cost
394

 
339

24

 
25

Expected return on plan assets
(632
)
 
(508
)
(29
)
 
(25
)
Recognized net actuarial loss (gain)
283

 
258

(3
)
 
(3
)
Amortization of prior service credit
(33
)
 
(50
)
(3
)
 
(3
)
Net periodic benefit cost (credit)
$
147

 
$
165

$
(3
)
 
$
3