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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Disaggregation of Revenue [Line Items]
Advertising fees and related income	$ 8,355	$ 7,466	$ 16,960	$ 14,734
Contract with Customer, Portion of Liability not yet being Amortized	9,300		$ 9,300		$ 10,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period			7 years 8 months 12 days
Franchise Segment [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Initial Franchise Fees	618	527	$ 1,304	1,268
Franchise Segment [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Royalty Revenue	14,950	13,133	30,336	25,824
Advertising fees and related income	$ 8,355	$ 7,466	$ 16,960	$ 14,734

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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

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- Definition

The amount of initial franchise fees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 952
-SubTopic 605
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68064525&loc=d3e68606-108044

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- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

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- Definition

Revenue earned during the period from the leasing or otherwise lending to a third party the entity's rights or title to certain property. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Contract with Customer, Portion of Liability not yet being Amortized

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- Definition

Franchise Advertising Fund Income

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