Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The amount of expense charged against earnings by an Entity to record deferred gains and losses on hedge instruments. Examples include gain on economic hedges, amortization of gain on designated fair value hedge and so forth.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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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.

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Derivative Financial Instruments Income Statement Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 23, 2018	Sep. 24, 2017	Sep. 23, 2018	Sep. 24, 2017
Derivative [Line Items]
Net effect of swaps	$ (1,217)	$ (952)	$ (5,751)	$ 3,717
Interest Rate Swap [Member]
Derivative [Line Items]
Amortization of deferred hedge gains	2,364	2,366	7,094	7,095
Cash Flow Hedging [Member] \| Forward-Starting Interest Rate Swap [Member]
Derivative [Line Items]
Accumulated other comprehensive income (loss) related to cash flow hedges	(2,400)		(2,400)
Net Effect of Swaps [Member] \| Designated As Hedging [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Amount and Location of Gain (Loss) Recognized in Income on Derivatives	$ 3,581	$ 3,318	$ 12,845	$ 3,378