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Retirement Plans (Tables)
 6 Months Ended
Jul. 02, 2017
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 for the three- and six-month periods ended July 2, 2017, and July 3, 2016, consisted of the following:
 
Pension Benefits
Other Post-retirement Benefits
Three Months Ended
July 2, 2017
 
July 3, 2016
July 2, 2017
 
July 3, 2016
Service cost
$
42

 
$
44

$
3

 
$
2

Interest cost
113

 
114

9

 
9

Expected return on plan assets
(170
)
 
(178
)
(9
)
 
(8
)
Recognized net actuarial loss (gain)
86

 
84

(1
)
 
(1
)
Amortization of prior service credit
(16
)
 
(17
)
(1
)
 
(1
)
Net periodic benefit cost
$
55

 
$
47

$
1

 
$
1

Six Months Ended
 
 
 
 
 
 
Service cost
$
84

 
$
88

$
6

 
$
5

Interest cost
226

 
228

17

 
17

Expected return on plan assets
(339
)
 
(356
)
(17
)
 
(16
)
Recognized net actuarial loss (gain)
172

 
168

(2
)
 
(2
)
Amortization of prior service credit
(33
)
 
(34
)
(2
)
 
(3
)
Net periodic benefit cost
$
110

 
$
94

$
2

 
$
1