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Income Taxes (Details) $ in Thousands, kr in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2021 USD ($) | Jul. 04, 2020 USD ($) | Jul. 03, 2021 USD ($) | Jul. 03, 2021 NOK (kr) | Jul. 04, 2020 USD ($)
Income Taxes |  |  |  |  |
Provision (benefit) for income taxes | $ 1,165 | $ (4,229) | $ 3,157 |  | $ (8,443)
Effective income tax rate (as a percent) | (6.70%) | 10.50% | (7.80%) | (7.80%) | 11.10%
Income tax expense (benefit), continuing operations | $ 9,600 |  | $ 9,600 |  |
Gross unrecognized tax benefits | 3,400 |  | 3,400 |  |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | $ 2,700 |  | 2,700 |  |
Norwegian | 2013 | Under appeal |  |  |  |  |
Income Taxes |  |  |  |  |
Additional income tax expense |  |  | $ 16,400 | kr 141.3 |

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