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Earnings Per Share (Tables)
9 Months Ended
Sep. 29, 2018
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted shares used to calculate earnings per share
Three Months EndedNine Months Ended
September 29,September 30,September 29,September 30,
2018201720182017
Basic 152,533156,914152,970157,386
Effect of dilutive securities:
Stock options, restricted stock and restricted stock units 1,0811,3571,0121,480
Diluted 153,614158,271153,982158,866