Acquisition Purchase Price Allocation, 2016 Acquisitions (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Business Acquisition [Line Items]
Inventory		$ 558	$ 544
Land and building		19,387	22,614
Restaurant equipment		1,599	2,844
Restaurant equipment - subject to capital lease		435	443
Leasehold improvements		2,464	1,770
Franchise fees		1,121	1,000
Franchise rights		21,202	20,666
Favorable leases		390	1,475
Deferred taxes		216
Goodwill	$ 36,792	22,869	20,438
Capital lease obligation for restaurant equipment		(492)	(494)
Unfavorable leases		(1,152)	(324)
Other liabilities		(71)	(433)
Purchase price		48,088	$ 52,750
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Goodwill		$ 2,431

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Franchise Fees

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Franchise Rights

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land and Building

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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Amount of capital lease obligation, assumed at the acquisition date.

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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date.

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Amount of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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