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Earnings Per Share Antidilutive Securities Excluded from Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 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) 1,226 616