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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense at U.S. federal statutory corporate tax rate | 21.00% | 21.00% | 21.00% | 21.00% |
Decrease in effective tax rate | 5.00% | 7.00% | 5.00% | 7.00% |
Discrete tax benefit related to stock options | 4.00% | 1.00% | 9.00% | 3.00% |
Discrete tax expense (benefit) related to tax return filings | 0.00% | (3.00%) | 3.00% | (1.00%) |
Effective tax rate excluding discrete items (as a percent) | 18.00% | 16.00% | 18.00% | 16.00% |
Decrease in reserves for income taxes, net of deferred tax benefit |  |  | $ 198 |  |
Interest and penalties included in reserve |  |  | 212 |  |
Liability for uncertain tax positions | $ 12,353 |  | 12,353 |  |
Reserve for income taxes classified as a noncurrent iability | 11,325 |  | 11,325 |  | $ 11,563
Increase to non-current deferred tax liability |  |  | 1,028 |  |
Interest and penalties, gross | $ 1,192 |  | $ 1,192 |  |
Tax years open to examination by Internal Revenue Service |  |  | 2017 through 2019 |  |
Tax years open to examination by various taxing authorities for other entities |  |  | 2016 through 2019 |  |
Foreign Tax Authority | Revenue Commissioners, Ireland |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense at U.S. federal statutory corporate tax rate |  |  | 12.50% |  |
Foreign Tax Authority | State Administration of Taxation, China |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense at U.S. federal statutory corporate tax rate |  |  | 25.00% |  |
Domestic Tax Authority |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense at U.S. federal statutory corporate tax rate |  |  | 21.00% |  |

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