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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 31, 2018 | May 24, 2018
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Number of shares of common stock subject to awards |  |  |  |  | 1,500,000
Shares available for grant | 821,703 | 1,032,403 | 1,195,993 |  |
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options | 165,000 | 102,000 | 119,000 |  |
Number of shares authorized to be repurchased (in shares) |  |  |  | 200,000,000 |
Stock repurchase program, period in force | 3 years |  |  |  |
Stock repurchased during period (in shares) | 253,490 | 253,490 |  |  |
Weighted average price (in usd per share) | $ 94.89 |  |  |  |
Stock repurchased during period | $ 24.1 |  |  |  |
Deferred and Restricted Stock Unit |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unrecognized compensation costs | $ 18.9 |  |  |  |
Unrecognized compensation costs, weighted-average recognition period | 1 year 3 months 18 days |  |  |  |
Performance Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unrecognized compensation costs | $ 0.6 |  |  |  |
Unrecognized compensation costs, weighted-average recognition period | 2 months 12 days |  |  |  |

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