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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Components of accumulated other comprehensive income (loss), net of tax, are as follows:
 
Interest Rate Swaps
 
Post-Retirement Liabilities
 
Total
Balance at December 30, 2017
(1,587
)
 
288

 
(1,299
)
Unrealized gain on interest rate swaps
804

 
—

 
804

Reclassification of loss into earnings from interest rate swaps
228

 
—

 
228

Reclassification of net actuarial gain into earnings from postretirement benefit plans
—

 
(7
)
 
(7
)
Reclassification of prior service credits into earnings from postretirement benefit plans
—

 
(1
)
 
(1
)
Balance at March 31, 2018
$
(555
)
 
$
280

 
$
(275
)