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Common Stock Issued and Outstanding (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022 is shown below.
(Number of shares outstanding)
202220212020
Beginning of year154,463,050 153,598,625 152,935,361 
Stock options exercised  1
181,655 32,554 11,359 
Restricted stock awards  1
822,614 831,871 651,905 
End of year155,467,319 154,463,050 153,598,625 
1 Shares issued upon exercise of stock options and award of restricted stock are less than the amount reflected in Note J due to withholdings for statutory income taxes owed upon issuance of shares.