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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Summary of the activity related to gross unrecognized tax benefits |  |  |
Beginning balance | $ 2,036 | $ 3,187 | $ 3,054
Additions based on tax positions related to current year | 436 | 630 | 456
Additions based on tax positions related to prior years |  | 115 | 114
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) | (437)
Ending balance | 2,276 | 2,036 | 3,187
Unrecognized tax benefits |  |  |
Gross unrecognized tax benefits, inclusive of interest | 2,400 | 2,100 | 3,200
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | 1,900 | $ 2,100 | $ 3,200
Norwegian | 2013 | Under appeal |  |  |
Unrecognized tax benefits |  |  |
Additional income tax expense | $ 16,000 |  |

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