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Common Stock Issued and Outstanding | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Common Stock Issued and Outstanding | 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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