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Intangible Assets (Tables)
 6 Months Ended
Jul. 01, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
no changes in goodwill for the six months ended July 1, 2018.
Schedule of Indefinite-Lived Intangible Assets [Table Text Block]
The change in franchise rights for the six months ended July 1, 2018 is summarized below:
Balance at December 31, 2017
$
152,028

Acquisitions of restaurants (Note 2)
290

Amortization expense
(3,568
)
Balance at July 1, 2018
$
148,750