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Employee Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 27, 2017 | Dec. 28, 2016
--- | --- | ---
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other current liabilities | $ 0 | $ 0
Other noncurrent liabilities | 0 | 0
Net amount recognized | 0 | 0
Other Defined Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other current liabilities | (280) | (259)
Other noncurrent liabilities | (2,328) | (2,380)
Net amount recognized | $ (2,608) | $ (2,639)

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