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v3.20.4

Stockholders' Equity - Rollforward of Common Stock (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity |  |  |
Beginning (shares) | 10,422,091 |  |
Ending (shares) | 10,563,290 | 10,422,091 |
Treasury |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |
Beginning (shares) | 693,688 | 749,772 | 775,203
Issued for stock-based compensation plans (shares) | (141,199) | (56,084) | (25,431)
Ending (shares) | 552,489 | 693,688 | 749,772
Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |
Beginning (shares) | 10,422,091 | 10,366,007 | 10,340,576
Issued for stock-based compensation plans (shares) | 141,199 | 56,084 | 25,431
Ending (shares) | 10,563,290 | 10,422,091 | 10,366,007

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