Acquisition Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Business Combinations [Abstract]
Business Acquisition, Pro Forma Restaurant Sales	$ 285,235	$ 269,145	$ 826,347	$ 800,926
Business Acquisition, Pro Forma Net Income (Loss)	$ 2,929	$ 6,450	$ 4,645	$ 23,079
Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted	$ 0.07	$ 0.14	$ 0.10	$ 0.51
Acquisition costs	$ 200	$ 500	$ 1,400	$ 1,100

Business Acquisition, Pro Forma Earnings Per Share, Basic and Diluted

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

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- Definition

For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- References

No definition available.

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