Acquisition Purchase Price Allocation, 2015 Acquisitions (Details) $ in Thousands	12 Months Ended
Jan. 03, 2016 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)
Business Acquisition [Line Items]
Number of acquisitions	8
Inventory	$ 544		$ 558
Land and building	22,614		19,387
Restaurant equipment	2,844		1,599
Restaurant equipment - subject to capital lease	443		435
Leasehold improvements	1,770		2,464
Franchise fees	1,000		1,121
Franchise rights	20,666		21,202
Favorable leases	1,475		390
Goodwill	20,438	$ 36,792	22,869
Capital lease obligation for restaurant equipment	(494)		(492)
Unfavorable leases	(324)		(1,152)
Other liabilities	(433)		(71)
Purchase price	52,750		48,088
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Goodwill	$ 2,645		$ 22,869

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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Number of separate acquisition transactions during the period

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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 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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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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