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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 286 $ 223 $ 855 $ 830
Effective tax rate (0.90%) (1.70%) (0.80%) (2.30%)