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Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 24, 2017 | Dec. 25, 2016
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Transfers among levels within the fair value hierarchy | $ 0 |
Carrying Value |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Cash surrender value of life insurance policies | 27,254 | $ 21,690
Interest rate swap liabilities | 2,454 | 770
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 | 27,254 | 21,690
Measured on Recurring Basis | Level 2 |  |
Measurement of financial assets and liabilities at fair value on a recurring basis |  |
Interest rate swap liabilities | $ 2,454 | $ 770

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- Definition Amount of transfers of financial instruments between levels of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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