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Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Net Funded Status [Table Text Block]
The following was the plan status and accumulated postretirement benefit obligation (APBO) at December 31, 2017 and January 1, 2017:
 
 
December 31, 2017
 
January 1, 2017
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
4,566

 
$
3,060

Service cost
192

 
150

Interest cost
191

 
165

Plan participants' contributions
88

 
98

Actuarial loss (gain)
(122
)
 
1,251

Benefits paid
(115
)
 
(164
)
Medicare part D prescription drug subsidy
38

 
6

Benefit obligation at end of year
$
4,838

 
$
4,566

Change in plan assets:
 

 
 

Fair value of plan assets at beginning of year
$
—

 
$
—

Employer contributions (refund)
(11
)
 
60

Plan participants' contributions
88

 
98

Benefits paid
(115
)
 
(164
)
Medicare part D prescription drug subsidy
38

 
6

Fair value of plan assets at end of year
—

 
—

Funded status
$
(4,838
)
 
$
(4,566
)
Weighted average assumptions:
 

 
 

Discount rate used to determine benefit obligations
3.60
%
 
4.11
%
Discount rate used to determine net periodic benefit cost
4.11
%
 
4.25
%
Schedule of Net Benefit Costs [Table Text Block]
Components of net periodic postretirement benefit income recognized in the consolidated statements of operations were:
 
Year ended
 
December 31, 2017
 
January 1, 2017
 
January 3, 2016
Service cost
$
192

 
$
150

 
$
127

Interest cost
191

 
165

 
114

Amortization of net gains and losses
222

 
197

 
163

Amortization of prior service credit
(355
)
 
(355
)
 
(355
)
Net periodic postretirement benefit expense
$
250

 
$
157

 
$
49
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
Amounts recognized in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit income, consisted of:
 
Year ended
 
December 31, 2017
 
January 1, 2017
Prior service credit
$
1,617

 
$
1,972

Net loss
(2,928
)
 
(3,272
)
Deferred income taxes
101

 
97

Accumulated other comprehensive loss
$
(1,210
)
 
$
(1,203
)
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
The following table reflects the changes in accumulated other comprehensive income for the years ended December 31, 2017 and January 1, 2017:  
 
Year ended
 
December 31, 2017
 
January 1, 2017
Net actuarial loss (gain)
$
(122
)
 
$
1,251

Amortization of net loss
(222
)
 
(197
)
Amortization of prior service credit
355

 
355

Deferred income taxes
(4
)
 
(541
)
Total recognized in accumulated other comprehensive loss
$
7

 
$
868
Schedule of Health Care Cost Trend Rates [Table Text Block]
Assumed health care cost trend rates at year end were as follows:      
 
December 31, 2017
 
January 1, 2017
 
January 3, 2016
Medical benefits cost trend rate assumed for the following year pre-65
7.25
%
 
7.50
%
 
7.75
%
Medical benefits cost trend rate assumed for the following year post-65
6.25
%
 
6.50
%
 
6.75
%
Prescription drug benefit cost trend rate assumed for the following year
10.50
%
 
10.50
%
 
11.00
%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
3.89
%
 
3.89
%
 
3.89
%
Year that the rate reaches the ultimate trend rate
2075

 
2075

 
2075
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
A one-percentage-point change in the health care cost trend rates would have the following effects:  
 
1% Point Increase
 
1% Point Decrease
Effect on total of service and interest cost components
$
112

 
$
80

Effect on postretirement benefit obligation
1,043

 
788