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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2018
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)
2017
 
2016
Denominator
 
 
 
Basic average common shares outstanding
329,388

 
321,805

Dilutive potential common shares:
 
 
 
Shares contingently issuable under employee stock plans
547

 
165

Shares restricted under stock plans
821

 
1,554

Diluted Average Common Shares
330,756

 
323,524