Derivative Financial Instruments Income Statement Location (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 25, 2018	Mar. 26, 2017
Derivative [Line Items]
Net effect of swaps	$ 3,628	$ (301)
Interest Rate Swap [Member]
Derivative [Line Items]
Amortization of deferred hedge gains	2,400	2,400
Cash Flow Hedging [Member] \| Forward-Starting Interest Rate Swap [Member]
Derivative [Line Items]
Accumulated other comprehensive income (loss) related to cash flow hedges	(7,100)
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	$ 6,000	$ 2,100

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

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- Definition

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/2003/role/presentationRef
-Publisher FASB
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
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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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