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Provision for Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 4,860 $ 3,081 $ 10,550 $ 9,500
Effective income tax rate (as a percentage)     26.00% 28.00%