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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 2,895 $ 2,622 $ 7,337 $ 2,736