Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details)
3 Months Ended 9 Months Ended
Sep. 26, 2019
Sep. 27, 2018
Sep. 26, 2019
Sep. 27, 2018
Income Taxes        
Effective income tax rate (as a percent) (39.30%) 17.10% (4.90%) 3.50%