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Provision for Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 2,955 $ 3,531 $ 5,690 $ 6,419
Effective income tax rate (as a percentage)     25.00% 29.00%