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Common Stock Issued and Outstanding (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Activity in Number of Shares of Common Stock Issued and Outstanding
Activity in the number of shares of Common Stock issued and outstanding for the three years ended December 31, 2019 is shown below.
(Number of shares outstanding)
2019
 
2018
 
2017
Beginning of year
173,058,829

 
172,572,873

 
172,202,177

Stock options exercised  1
12,345

 
21,200

 
—

Restricted stock awards  1
561,729

 
464,756

 
368,132

Employee stock purchase and thrift plans
—

 
—

 
2,564

Treasury shares purchased
(20,697,542
)
 
—

 
—

End of year
152,935,361

 
173,058,829

 
172,572,873

1 Shares issued upon exercise of stock options and award of restricted stock are less than the amount reflected in Note K due to withholdings for statutory income taxes owed upon issuance of shares.