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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Earnings (Loss) Per Share (Thousands of Dollars and Shares Except Per Share Data) [Abstract]    
Net earnings (loss) $ 26,727 $ (112,492)
Basic [Abstract]    
Average shares outstanding (in shares) 126,287 125,073
Equivalent shares (basic) (in shares) 126,287 125,073
Net earnings (loss) per common share-basic (in dollars per share) $ 0.21 $ (0.9)
Diluted [Abstract]    
Average shares outstanding (in shares) 126,287 125,073
Effect of dilutive securities:    
Options and other share-based awards (in shares) 529 0
Equivalent shares (diluted) (in shares) 126,816 125,073
Net earnings (loss) per common share-diluted (in dollars per share) $ 0.21 $ (0.9)
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 1,693 3,191
Dilutive securities excluded because of net loss   1,993
Impact of dilutive securities excluded because of net loss   1,022