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Retirement Plans (Tables)
 6 Months Ended
Jul. 01, 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 six-month periods ended July 1, 2018, and July 2, 2017, consisted of the following:
 
Pension Benefits
Other Post-retirement Benefits
Three Months Ended
July 1, 2018
 
July 2, 2017
July 1, 2018
 
July 2, 2017
Service cost
$
44

 
$
42

$
2

 
$
3

Interest cost
140

 
113

8

 
9

Expected return on plan assets
(228
)
 
(170
)
(10
)
 
(9
)
Recognized net actuarial loss (gain)
93

 
86

(1
)
 
(1
)
Amortization of prior service credit
(11
)
 
(16
)
(1
)
 
(1
)
Net periodic benefit cost (credit)
$
38

 
$
55

$
(2
)
 
$
1

Six Months Ended
 
 
 
 
 
 
Service cost
$
90

 
$
84

$
5

 
$
6

Interest cost
254

 
226

16

 
17

Expected return on plan assets
(407
)
 
(339
)
(19
)
 
(17
)
Recognized net actuarial loss (gain)
189

 
172

(2
)
 
(2
)
Amortization of prior service credit
(22
)
 
(33
)
(2
)
 
(2
)
Net periodic benefit cost (credit)
$
104

 
$
110

$
(2
)
 
$
2