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Earnings Per Share Antidilutive Securities Excluded from Earnings Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Common stock equivalents        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 875,580 444,723 745,738 730,884