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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 30, 2019 | Mar. 31, 2018
Income Taxes |  |
Provision (benefit) for income taxes | $ (2,480) | $ (4,371)
Effective income tax rate (as a percent) | (85.00%) | (19.80%)
Gross unrecognized tax benefits | $ 2,100 |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | 2,100 |
Unrecognized tax benefits as a result of a lapse in the statute of limitations | 300 |
Reductions for tax positions as a result of a lapse of the applicable statute of limitations | 300 |
2013 | Norwegian |  |
Income Taxes |  |
Adjustment to the pricing of the intercompany transaction | $ 16,400 |

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