Stock-Based Employee Compensation - Stock Compensation Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 25, 2019	Jun. 26, 2018	Jun. 25, 2019	Jun. 26, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock compensation cost	$ 1,010	$ 1,071	$ 2,221	$ 2,098
Restaurant operating expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock compensation cost	6	29	14	64
General and administrative costs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock compensation cost	$ 1,004	$ 1,042	$ 2,207	$ 2,034

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration