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Goodwill and Intangible Assets (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 27, 2017 USD ($) restaurants | Dec. 28, 2016 USD ($) | Dec. 30, 2015 USD ($)
Goodwill [Roll Forward] |  |  |
Balance, beginning of year | $ 35,233 | $ 33,454 |
Additions related to acquisitions | 3,021 | 1,827 |
Adjustments related to the sale of restaurants | 15 | (48) |
Balance, end of year | 38,269 | 35,233 | $ 33,454
Intangible Assets [Line Items] |  |  |
Gross carrying amount - Trade names | 44,080 | 44,076 |
Gross carrying amount - Liquor licenses | 166 | 166 |
Accumulated amortization - Intangible assets with definite lives | 2,389 | 1,437 |
Intangible assets | 59,498 | 55,930 |
Amortization expense of definite-lived intangible assets and other assets | $ 2,500 | 1,500 | $ 1,500
Restaurants reacquired from franchisees | restaurants | 10 |  |
Restaurants reacquired from former franchisees | restaurants | 1 |  |
Purchase price to reacquire franchised restaurants | $ 8,800 |  |
Purchase price allocated to property | 1,300 |  |
Purchase price allocated to goodwill | 3,021 | 1,827 |
Capital leases recorded related to acquired franchise restaurants | 2,300 |  |
Franchise and License Agreements [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying amount - Intangible assets with definite lives | 0 | 190 |
Accumulated amortization - Intangible assets with definite lives | 0 | 186 |
Reacquired Franchise Rights [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Gross carrying amount - Intangible assets with definite lives | 15,252 | 11,498 |
Accumulated amortization - Intangible assets with definite lives | 2,389 | $ 1,251 |
Purchase price allocation to reacquired franchise rights | $ 4,500 |  |
Weighted-average life of reacquired franchise rights | 9 years |  |

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