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Fair Value Measurements (Installment Loan) (Details) - USD ($) $ in Thousands | Dec. 27, 2016 | Dec. 29, 2015
--- | --- | ---
Carrying Amount |  |
Carrying amount and Fair value of financial instruments |  |
Installment loan | $ 550 | $ 694
Fair Value | Level 2 |  |
Carrying amount and Fair value of financial instruments |  |
Installment loan | $ 599 | $ 779

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