Income Taxes	6 Months Ended
Jun. 30, 2018
Income Taxes
Income Taxes	12. Income Taxes Provision (benefit) for income taxes includes both domestic and foreign income taxes at the applicable tax rates adjusted for non-deductible expenses, research and development tax credits and other permanent differences. Income tax expense (benefit) was $0.4 million and $1.3 million for the three months ended June 30, 2018 and July 1, 2017, resulting in effective tax rates of 3.0% and 7.1%, respectively. Income tax expense (benefit) was $(3.9) million and $(0.7) million for the six months ended June 30, 2018 and July 1, 2017, resulting in effective tax rates of (10.7)% and (2.3)%, respectively. The effective tax rate for the three and six months ended June 30, 2018 decreased from the prior periods primarily due to a decrease in the U.S. statutory tax rate from 35% to 21%. This decrease was partially offset by a decrease in the foreign tax rate benefit. U.S. Tax Reform The Tax Cuts and Jobs Act (the “Act”) was enacted on December 22, 2017. The Act reduces the U.S. federal corporate income tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries previously deferred from tax and creates a new provision designed to tax global intangible low-taxed income (“GILTI”). Also on December 22, 2017, the U.S. Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 (“SAB 118”) which provides for a measurement period of up to one year from the enactment for companies to complete their accounting for the Act. The Company is applying the guidance in SAB 118 when accounting for the enactment-date effects of the Act. At June 30, 2018, the Company has not completed its accounting for the tax effects of the Act but has made reasonable estimates of the effects on the re-measurement of its deferred tax assets and liabilities as well as its transition tax liability. During the three month period ended June 30, 2018, the Company did not record any adjustments to the provisional amounts recorded at December 30, 2017. The Company has not yet fully collected all necessary data to complete its analysis of the effect of the Act on its deferred tax assets and liabilities and is awaiting additional guidance to complete its analysis. Therefore, the Company has not yet completed its accounting of the re-measurement of its deferred tax assets and liabilities. Additionally, the Company has not yet collected and analyzed all necessary tax and earnings data of its foreign operations and therefore, the Company has also not yet completed its accounting for the income tax effects of the transition tax. The Company will continue to make and refine its calculations as additional analysis is completed. In other cases, the Company has not been able to make a reasonable estimate and therefore continues to account for those items based in its existing accounting under ASC 740, Income Taxes, and the provisions of the tax laws that were in effect immediately prior to enactment of the Act. The Act subjects a U.S. shareholder to tax on GILTI earned by certain foreign subsidiaries. Under U.S. GAAP, the Company is permitted to make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. Given the complexity of the GILTI provisions, the Company is still evaluating the effects of the GILTI provisions and has not yet made its accounting policy election. At June 30, 2018, because the Company is still evaluating the GILTI provisions, the Company has included tax expense related to GILTI for the current year in its estimated annual effective tax rate and has not provided additional GILTI on deferred items. Additionally, while the Act has applied a tax on accumulated foreign earnings as of the end of fiscal 2017, the Company is still evaluating whether to continue to apply the exception under ASC 740-30-25-18 to the presumption of repatriation of foreign earnings. As a result, the Company has not provided an estimate of the taxes associated with the reversal of this exception. The Company is analyzing the impact of a change in this presumption but until completing its analysis, the Company continues to apply the exception under ASC 740-30-25-18. Uncertain Tax Positions As of June 30, 2018, the Company had gross unrecognized tax benefits of $2.6 million, of which $2.0 million would affect the effective tax rate if recognized. During the six months ended June 30, 2018, the Company released $1.5 million of unrecognized tax benefits as a result of a lapse in the statute of limitations. The Company recognizes interest and penalties related to unrecognized tax benefits in the provision (benefit) for income taxes. These amounts were not material for any of the periods presented. The Norwegian Tax Administration (“NTA”) has completed its examination of the Company’s Norwegian subsidiary for income tax matters relating to fiscal years 2013, 2014, 2015 and 2016. The Company received a final assessment from the NTA in December 2017 concerning an adjustment to its 2013 taxable income related to the pricing of an intercompany transaction. The adjustment to 2013 taxable income would result in additional Norwegian tax of approximately $30 million, excluding interest and penalties. The Company disagrees with the NTA’s assessment and believes the Company’s position on this matter is more likely than not to be sustained. The Company plans to exhaust all available administrative remedies, and if unable to resolve this matter through administrative remedies with the NTA, the Company plans to pursue judicial remedies. The Company believes that it is likely that the NTA will request a payment of approximately $15 million in 2018 during the appeal process. The Company believes that it has accrued adequate reserves related to all matters contained in tax periods open to examination. Should the Company experience an unfavorable outcome in the NTA matter, however, such an outcome could have a material impact on its financial statements. Tax years 2013 through 2018 remain open to examination by the major taxing jurisdictions to which the Company is subject. The Company is not currently under audit in any major taxing jurisdiction. The Company believes it is reasonably possible that the gross unrecognized tax benefits will decrease by approximately $0.4 million in the next 12 months due to the lapse of the statute of limitations applicable to tax deductions and tax credits claimed on prior year tax returns.

12. Income Taxes

Provision (benefit) for income taxes includes both domestic and foreign income taxes at the applicable tax rates adjusted for non-deductible expenses, research and development tax credits and other permanent differences. Income tax expense (benefit) was $0.4 million and $1.3 million for the three months ended June 30, 2018 and July 1, 2017, resulting in effective tax rates of 3.0% and 7.1%, respectively. Income tax expense (benefit) was $(3.9) million and $(0.7) million for the six months ended June 30, 2018 and July 1, 2017, resulting in effective tax rates of (10.7)% and (2.3)%, respectively. The effective tax rate for the three and six months ended June 30, 2018 decreased from the prior periods primarily due to a decrease in the U.S. statutory tax rate from 35% to 21%. This decrease was partially offset by a decrease in the foreign tax rate benefit.

U.S. Tax Reform

The Tax Cuts and Jobs Act (the “Act”) was enacted on December 22, 2017. The Act reduces the U.S. federal corporate income tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries previously deferred from tax and creates a new provision designed to tax global intangible low-taxed income (“GILTI”). Also on December 22, 2017, the U.S. Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 (“SAB 118”) which provides for a measurement period of up to one year from the enactment for companies to complete their accounting for the Act. The Company is applying the guidance in SAB 118 when accounting for the enactment-date effects of the Act.

At June 30, 2018, the Company has not completed its accounting for the tax effects of the Act but has made reasonable estimates of the effects on the re-measurement of its deferred tax assets and liabilities as well as its transition tax liability. During the three month period ended June 30, 2018, the Company did not record any adjustments to the provisional amounts recorded at December 30, 2017. The Company has not yet fully collected all necessary data to complete its analysis of the effect of the Act on its deferred tax assets and liabilities and is awaiting additional guidance to complete its analysis. Therefore, the Company has not yet completed its accounting of the re-measurement of its deferred tax assets and liabilities. Additionally, the Company has not yet collected and analyzed all necessary tax and earnings data of its foreign operations and therefore, the Company has also not yet completed its accounting for the income tax effects of the transition tax. The Company will continue to make and refine its calculations as additional analysis is completed.

In other cases, the Company has not been able to make a reasonable estimate and therefore continues to account for those items based in its existing accounting under ASC 740, Income Taxes, and the provisions of the tax laws that were in effect immediately prior to enactment of the Act.

The Act subjects a U.S. shareholder to tax on GILTI earned by certain foreign subsidiaries. Under U.S. GAAP, the Company is permitted to make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. Given the complexity of the GILTI provisions, the Company is still evaluating the effects of the GILTI provisions and has not yet made its accounting policy election. At June 30, 2018, because the Company is still evaluating the GILTI provisions, the Company has included tax expense related to GILTI for the current year in its estimated annual effective tax rate and has not provided additional GILTI on deferred items.

Additionally, while the Act has applied a tax on accumulated foreign earnings as of the end of fiscal 2017, the Company is still evaluating whether to continue to apply the exception under ASC 740-30-25-18 to the presumption of repatriation of foreign earnings. As a result, the Company has not provided an estimate of the taxes associated with the reversal of this exception. The Company is analyzing the impact of a change in this presumption but until completing its analysis, the Company continues to apply the exception under ASC 740-30-25-18.

Uncertain Tax Positions

As of June 30, 2018, the Company had gross unrecognized tax benefits of $2.6 million, of which $2.0 million would affect the effective tax rate if recognized. During the six months ended June 30, 2018, the Company released $1.5 million of unrecognized tax benefits as a result of a lapse in the statute of limitations.

The Company recognizes interest and penalties related to unrecognized tax benefits in the provision (benefit) for income taxes. These amounts were not material for any of the periods presented.

The Norwegian Tax Administration (“NTA”) has completed its examination of the Company’s Norwegian subsidiary for income tax matters relating to fiscal years 2013, 2014, 2015 and 2016. The Company received a final assessment from the NTA in December 2017 concerning an adjustment to its 2013 taxable income related to the pricing of an intercompany transaction. The adjustment to 2013 taxable income would result in additional Norwegian tax of approximately $30 million, excluding interest and penalties. The Company disagrees with the NTA’s assessment and believes the Company’s position on this matter is more likely than not to be sustained. The Company plans to exhaust all available administrative remedies, and if unable to resolve this matter through administrative remedies with the NTA, the Company plans to pursue judicial remedies. The Company believes that it is likely that the NTA will request a payment of approximately $15 million in 2018 during the appeal process.

The Company believes that it has accrued adequate reserves related to all matters contained in tax periods open to examination. Should the Company experience an unfavorable outcome in the NTA matter, however, such an outcome could have a material impact on its financial statements.

Tax years 2013 through 2018 remain open to examination by the major taxing jurisdictions to which the Company is subject. The Company is not currently under audit in any major taxing jurisdiction.

The Company believes it is reasonably possible that the gross unrecognized tax benefits will decrease by approximately $0.4 million in the next 12 months due to the lapse of the statute of limitations applicable to tax deductions and tax credits claimed on prior year tax returns.