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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 02, 2016 | Apr. 04, 2015
Deferred: |  |
Income tax expense | $ 265 | $ 689
Effective income tax rate reconciliation |  |
Effective income tax rate (as a percent) | 4.40% | 9.70%
Components of deferred taxes |  |
Gross unrecognized tax benefits | $ 4,200 |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | 3,200 |
Amount of estimated decrease in unrecognized tax benefits | $ 1,100 |

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