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Significant Accounting Policies - Insurance Reserves and Derivatives (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Derivative Financial Instruments |  |  |
Other comprehensive income (loss), before tax | $ 1,421,000 | $ 1,492,000 | $ (1,846,000)
Other comprehensive income (loss), net of tax | 900,000 | $ 900,000 | $ (1,200,000)
Minimum |  |  |
Insurance Reserves |  |  |
Employee insurance retention limit per occurrence | 100,000 |  |
Maximum |  |  |
Insurance Reserves |  |  |
Employee insurance retention limit per occurrence | $ 1,000,000 |  |

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- Definition Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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