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Employee Benefit Plans (Benefits Expected to be Paid in Future Years) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 26, 2018 | Dec. 27, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 195 | $ 286
Estimated employer contributions during 2019 | 600 |
Benefits expected to be paid: |  |
2019 | 584 |
2020 | 263 |
2021 | 236 |
2022 | 300 |
2023 | 393 |
2024 through 2028 | $ 724 |

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