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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares The computation of diluted average common shares is as follows:
Year Ended December 31, (in thousands)
202020192018
Denominator
Basic average common shares outstanding384,347 374,650 356,491 
Dilutive potential common shares:
Shares contingently issuable under employee stock plans 929 — 
Shares restricted under employee stock plans 154 — 
Forward agreements 253 — 
Diluted Average Common Shares384,347 375,986 356,491