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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Income Taxes |  |  |  |
Provision (benefit) for income taxes | $ 29,276 | $ 442 | $ 26,796 | $ (3,929)
Effective income tax rate (as a percent) | 221.00% | 3.00% | 165.80% | (10.70%)
Discrete income tax expense |  |  | $ 28,100 |
Gross unrecognized tax benefits | $ 2,100 |  | 2,100 |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | $ 1,800 |  | 1,800 |
Unrecognized tax benefits as a result of a lapse in the statute of limitations |  |  | 300 |
2013 | Norwegian |  |  |  |
Income Taxes |  |  |  |
Adjustment to the pricing of the intercompany transaction |  |  | $ 16,600 |

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