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Earnings Per Share (Narrative) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,518,129 1,873,871 2,488,826 2,453,271
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units 0 0 0 0
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 917,702 31,582 850,013 20,534