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Segment Information and Enterprise Reporting Long-lived assets by geographic area (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 30, 2017
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-Lived Assets | $ 283,287 | $ 278,020
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 100.00% | 100.00%
Reportable Geographical Components | United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-Lived Assets | $ 270,531 | $ 265,678
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 95.50% | 95.60%
Reportable Geographical Components | International |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-Lived Assets | $ 12,756 | $ 12,342
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 4.50% | 4.40%

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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