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Earnings Per Share (Schedule of Reconciliation of Number of Shares Utilized in Earnings Per Share Calculations) (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Earnings Per Share [Abstract]      
Number of common shares-basic 109,857 109,478 112,507
Effect of dilutive securities, Stock options 708 640 621
Effect of dilutive securities, Restricted stock 294 195 187
Number of common shares-diluted 110,859 110,313 113,315
Number of potentially dilutive securities excluded from calculation due to antidilutive impact 287 458 607