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Earnings Per Share Antidilutive Securities Excluded from Earnings Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Common stock equivalents excluded because their inclusion would be anti-dilutive        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 1,746,899 875,580 1,392,684 745,738