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Common Stock Issued and Outstanding (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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