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Stock Based Compensation (Schedule of Share Based Compensation Included in Net Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation	$ 7,716	$ 9,310	$ 10,316
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation	6,762	7,283	7,801
Common Stock Subject to Vesting Requirements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation	$ 954	$ 2,027	$ 2,515

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of cost expensed and capitalized for award under share-based payment arrangement.

+ References

Reference 1: 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)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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