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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. 25, 2019 | Dec. 26, 2018
Retirement Benefits [Abstract] |  |
Employer contributions | $ 162 | $ 195
Estimated employer contributions during 2020 | 700 |
Benefits expected to be paid: |  |
2020 | 662 |
2021 | 223 |
2022 | 327 |
2023 | 418 |
2024 | 132 |
2025 through 2029 | $ 640 |

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