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Segment Information and Enterprise Reporting Long-lived assets by geographic area (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 285,294	$ 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	$ 271,951	$ 265,678
Concentration Risk, Long-lived Asset Geographic Area, Percentage	95.30%	95.60%
Reportable Geographical Components | International
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 13,343	$ 12,342
Concentration Risk, Long-lived Asset Geographic Area, Percentage	4.70%	4.40%

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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

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