Closure costs (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jul. 01, 2018 |
Jun. 30, 2019 |
Jul. 01, 2018 |
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| Closure costs [Abstract] | ||||
| Closure costs | $ 216 | $ 0 | $ 588 | $ 0 |
| X | ||||||||||
- Definition Non cash expenses associated with the closure of a restaurant. No definition available.
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| X | ||||||||||
- Definition Closure costs [Abstract] No definition available.
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