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Fair Value Measurements and Disclosures (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 25, 2016
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Impairment loss | $ 1,674 | $ 1,350
Transfers among levels within the fair value hierarchy | 0 | 0
China Operations |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Impairment loss | 1,700 | 1,400
Measured on Recurring Basis | Level 1 |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Cash surrender value of life insurance policies | 28,645 | 21,690
Measured on Recurring Basis | Level 2 |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Interest rate swap assets | 651 |
Interest rate swap liabilities |  | 770
Measured on Recurring Basis | Carrying Value |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Cash surrender value of life insurance policies | 28,645 | 21,690
Interest rate swap assets | $ 651 |
Interest rate swap liabilities |  | $ 770

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