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Common Stock Issued and Outstanding - Activity in the Number of Common Stock Issued and Outstanding (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning of year | 173,058,829 | 172,572,873 | 172,202,177
Stock options exercised | 12,345 | 21,200 | 0
Restricted stock awards | 561,729 | 464,756 | 368,132
Employee stock purchase and thrift plans | 0 | 0 | 2,564
Treasury shares purchased | (20,697,542) | 0 | 0
End of year | 152,935,361 | 173,058,829 | 172,572,873

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