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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning of year (in shares) | 152,935,361 | 173,058,829 | 172,572,873
Stock options exercised (in shares) | 11,359 | 12,345 | 21,200
Restricted stock awards (in shares) | 651,905 | 561,729 | 464,756
Treasury shares purchased (in shares) | 0 | (20,697,542) | 0
End of year (in shares) | 153,598,625 | 152,935,361 | 173,058,829

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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