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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Jul. 01, 2018
Jul. 02, 2017
Earnings (Loss) Per Share (Thousands of Dollars and Shares Except Per Share Data) [Abstract]        
Net earnings (loss) $ 60,299 $ 67,723 $ (52,193) $ 136,322
Basic [Abstract]        
Average shares outstanding (in shares) 125,711 125,263 125,392 125,221
Equivalent shares (basic) (in shares) 125,711 125,263 125,392 125,221
Net earnings (loss) per common share-basic (in dollars per share) $ 0.48 $ 0.54 $ (0.42) $ 1.09
Diluted [Abstract]        
Average shares outstanding (in shares) 125,711 125,263 125,392 125,221
Effect of dilutive securities:        
Options and other share-based awards (in shares) 624 2,104 0 2,075
Equivalent shares (diluted) (in shares) 126,335 127,367 125,392 127,296
Net earnings (loss) per common share-diluted (in dollars per share) $ 0.48 $ 0.53 $ (0.42) $ 1.07
Employee Stock Option and Restricted Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options to acquire shares totaling excluded as antidilutive 1,214 453 3,127 546
Dilutive securities excluded because of net loss     1,921  
Impact of dilutive securities excluded because of net loss     823