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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Loss before income taxes | $ (2,022) | $ (30,921) | $ (14,638) | $ (55,180)
Provision for income taxes | $ 891 | $ 579 | $ 1,969 | $ 347
Effective income tax rate | (44.10%) | (1.90%) | (13.50%) | (0.60%)

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