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Stock Options And Restricted Stock Awards (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options, Granted shares | 0 |  |
Stock option compensation expense | $ 0.9 | $ 1.2 | $ 1.4
Unrecognized compensation cost | $ 1.0 |  |
Unrecognized compensation cost recognition period | 2 years |  |
Intrinsic value on exercisable stock options | $ 21.0 |  |
Intrinsic value on outstanding stock options | $ 21.2 |  |
Share-based compensation number of shares vested | 415,000 |  |
Share-based compensation number of shares unvested | 40,000 |  |
Intrinsic value on exercised stock options | $ 0.8 | 3.5 | 1.8
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation expense | 9.4 | $ 9.4 | $ 8.0
Unrecognized compensation cost | $ 10.4 |  |
Unrecognized compensation cost recognition period | 1 year 4 months 24 days |  |
Fair market value of vested restricted stock awards | $ 9.9 |  |
A&R 2017 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum shares of stock awards authorized for issuance | 864,215 |  |
Share-based compensation number of common stock available for grant | 854,003 |  |
Number of shares newly Authorized | 590,000 |  |
Number of shares available for issuance Shares | 274,215 |  |
A&R 2017 Plan | Stock options or SARs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum shares of stock awards authorized for issuance | 500,000 |  |
A&R 2017 Plan | Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment award, expiration period | 10 years |  |
Exercise prices of stock options outstanding, lower range limit | $ 19.71 |  |
Exercise prices of stock options outstanding, upper range limit | $ 92.00 |  |
A&R 2017 Plan | Employee Stock Option | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment vesting period | 3 years |  |
A&R 2017 Plan | Employee Stock Option | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment vesting period | 4 years |  |
A&R 2017 Plan | Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment award, expiration period | 10 years |  |
A&R 2017 Plan | Restricted Stock [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment vesting period | 1 year |  |
A&R 2017 Plan | Restricted Stock [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payment vesting period | 4 years |  |

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