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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017
Income Taxes |  |  |  |  |  |
Provision (benefit) for income taxes | $ (442) | $ (1,261) | $ 3,929 | $ 709 |  |
Effective income tax rate (as a percent) | 3.00% | 7.10% | (10.70%) | (2.30%) |  |
Federal statutory rate (as a percent) |  |  | 21.00% |  |  | 35.00%
Gross unrecognized tax benefits | $ 2,600 |  | $ 2,600 |  |  |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | 2,000 |  | 2,000 |  |  |
Unrecognized tax benefits as a result of a lapse in the statute of limitations |  |  | 1,500 |  |  |
Amount of estimated decrease in unrecognized tax benefits | $ 400 |  | 400 |  |  |
2013 | Norwegian |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Adjustments to taxable income excluding interest and penalties |  |  | $ 30,000 |  |  |
Forecast | Norwegian |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Taxes payable during appeal process |  |  |  |  | $ 15,000 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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