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Income Taxes (Details) $ in Thousands, kr in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 03, 2020 USD ($) | Sep. 28, 2019 USD ($) | Oct. 03, 2020 USD ($) | Oct. 03, 2020 NOK (kr) | Sep. 28, 2019 USD ($)
Income Taxes |  |  |  |  |
Provision (benefit) for income taxes | $ (100) | $ 1,685 | $ (306) |  | $ 28,481
Effective income tax rate (as a percent) | (3.30%) | 7.70% | (9.30%) | (9.30%) | 74.90%
Gross unrecognized tax benefits | $ 2,900 |  | $ 2,900 |  |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | $ 2,000 |  | 2,000 |  |
Norwegian | 2013 | Under appeal |  |  |  |  |
Income Taxes |  |  |  |  |
Additional income tax expense |  |  | $ 15,200 | kr 141.3 |

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