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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Summary of the activity related to gross unrecognized tax benefits |  |  |
Beginning balance | $ 2,276 | $ 2,036 | $ 3,187
Additions based on tax positions related to current year | 577 | 436 | 630
Additions based on tax positions related to prior years |  |  | 115
Reductions based on tax positions related to prior years |  | (196) |
Reductions for tax positions as a result of a lapse of the applicable statute of limitations |  |  | (1,896)
Ending balance | 2,853 | 2,276 | 2,036
Unrecognized tax benefits |  |  |
Gross unrecognized tax benefits, inclusive of interest | 3,000 | 2,400 | 2,100
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | 2,100 | 1,900 | $ 2,100
Norwegian | 2013 |  |  |
Unrecognized tax benefits |  |  |
Additional income tax expense | $ 141,300 | $ 16,500 |

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