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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 01, 2017 | Apr. 02, 2016
Income Taxes |  |
Income tax benefit | $ 1,970 | $ (265)
Effective income tax rate reconciliation |  |
Effective income tax rate (as a percent) | (14.60%) | 4.40%
Components of deferred taxes |  |
Gross unrecognized tax benefits | $ 3,600 |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | 2,200 |
Amount of estimated decrease in unrecognized tax benefits | $ 1,900 |

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