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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 2,324 $ 3,206 $ 5,739 $ 3,921