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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Income Taxes |  |  |  |
Provision (benefit) for income taxes | $ 1,685 | $ (5,454) | $ 28,481 | $ (9,383)
Effective income tax rate (as a percent) | 7.70% | (24.40%) | 74.90% | (15.90%)
Discrete income tax expense | $ 28,100 |  |  |
Gross unrecognized tax benefits | 2,400 |  | $ 2,400 |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | $ 1,900 |  | 1,900 |
Unrecognized tax benefits as a result of a lapse in the statute of limitations |  |  | 200 |
Norwegian | 2013 |  |  |  |
Income Taxes |  |  |  |
Adjustment to the pricing of the intercompany transaction |  |  | $ 15,600 |

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