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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Income Tax Disclosure [Abstract]        
Income tax expense $ 1,784 $ 1,178 $ 3,753 $ 4,426
Effective income tax rate 36.00% 37.10% 37.30% 37.20%