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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
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Earnings Per Share [Abstract]        
Number of common shares-basic 110,845 110,477 110,694 110,386
Effect of dilutive securities, Stock options 559 786 595 824
Effect of dilutive securities, Restricted stock 124 189 122 181
Number of common shares-diluted 111,528 111,452 111,411 111,391
Number of potentially dilutive securities excluded from calculation due to antidilutive impact 291 346 388 339