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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Income Tax Disclosure [Abstract]        
Income tax expense $ 388 $ 1,484 $ 1,969 $ 3,248
Effective income tax rate 39.90% 37.20% 38.60% 37.20%