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Income Taxes (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Income Taxes |  |  |  |  |
Income tax benefit (provision) |  | $ (2,178) | $ (1,344) | $ (1,469) | $ (3,319)
Effective income tax rate reconciliation |  |  |  |  |
Effective income tax rate (as a percent) |  | 9.80% | 6.30% | 2.80% | 7.40%
Components of deferred taxes |  |  |  |  |
Gross unrecognized tax benefits |  | $ 3,300 |  | $ 3,300 |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized |  | 1,800 |  | 1,800 |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | 500 |  |  |
Amount of estimated decrease in unrecognized tax benefits |  | $ 1,900 |  | $ 1,900 |
Norwegian | 2013 |  |  |  |  |
Income Taxes |  |  |  |  |
Adjustments to taxable income excluding interest and penalties | $ 33,000 |  |  |  |

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