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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 04, 2015 | Jun. 28, 2014 | Jul. 04, 2015 | Jun. 28, 2014
Income Taxes |  |  |  |
Income tax expense | $ 956 | $ 5,937 | $ 1,645 | $ 7,407
Effective income tax rate (as a percent) | 11.20% | 29.40% | 10.50% | 24.90%
Gross unrecognized tax benefits | $ 3,900 |  | $ 3,900 |
Amount of estimated decrease in unrecognized tax benefits | $ 600 |  | $ 600 |

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