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Earnings Per Share (Tables)
6 Months Ended
Jul. 01, 2018
Earnings (Loss) Per Share (Thousands of Dollars and Shares Except Per Share Data) [Abstract]  
Earnings (Loss) Per Share
20182017
QuarterBasicDilutedBasicDiluted
Net earnings$60,29960,29967,72367,723
Average shares outstanding125,711125,711125,263125,263
Effect of dilutive securities:
Options and other share-based awards-624-2,104
Equivalent Shares125,711126,335125,263127,367
Net earnings per common share$0.480.480.540.53

20182017
Six MonthsBasicDilutedBasicDiluted
Net earnings (loss)$(52,193)(52,193)136,322136,322
Average shares outstanding125,392125,392125,221125,221
Effect of dilutive securities:
Options and other share-based awards---2,075
Equivalent Shares125,392125,392125,221127,296
Net earnings (loss) per common share$(0.42)(0.42)1.091.07