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Income Taxes (Details 2) - USD ($) $ in Thousands | 6 Months Ended
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Jul. 01, 2017 | Jul. 02, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |
Unrecognized tax benefits, balance at the beginning of the period | $ 9,964 | $ 14,450
Net changes in uncertain tax benefits | (1,870) | (2,563)
Unrecognized tax benefits, balance at the end of the period | 8,094 | $ 11,887
Expected change in unrecognized tax benefits in the next twelve months | $ (3,000) |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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