Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 27, 2016	Sep. 29, 2015	Sep. 27, 2016	Sep. 29, 2015
Share-based compensation expenses
Share-based compensation expense	$ 6,644	$ 5,434	$ 18,347	$ 15,649
Labor expense
Share-based compensation expenses
Share-based compensation expense	1,570	1,387	4,475	3,937
General and administrative expense
Share-based compensation expenses
Share-based compensation expense	$ 5,074	$ 4,047	$ 13,872	$ 11,712

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

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