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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Common Stock Outstanding Roll Forward |
|  | Common Stock
|  | Treasury |  | Outstanding
|  | (Number of Shares)
Balance at end of 2017 |  | 775,203 |  |  | 10,340,576 |
Issued for stock-based compensation plans |  | (25,431) |  |  | 25,431 |
Balance at end of 2018 |  | 749,772 |  |  | 10,366,007 |
Issued for stock-based compensation plans |  | (56,084) |  |  | 56,084 |
Balance at end of 2019 |  | 693,688 |  |  | 10,422,091 |
Issued for stock-based compensation plans |  | (141,199) |  |  | 141,199 |
Balance at end of 2020 |  | 552,489 |  |  | 10,563,290 |

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