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Stock-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2022 | May 13, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Deferred compensation (in shares) | 116,241 |  |  |  |  |  | 3,739 |
Shares due to exercise of employee stock options and issuance of directors' deferred stock |  |  | 19,618,000 | 8,007 | 6,038,000 | 910 |  |
Granted (in shares) |  |  |  |  |  |  | 248,000 |
Stock option expense |  |  |  |  |  |  | $ 800,000 |
Future expense | $ 2,700,000 |  | $ 2,700,000 |  |  |  | 2,700,000 |
Exercised |  |  |  |  |  |  | $ 237,724 | $ 3,450
Closing share price (in usd per share) | $ 47.11 |  | $ 47.11 |  |  |  | $ 47.11 |
Share-based compensation arrangement by share-based payment award, options, grants since inception | 1,459,750 |  | 1,459,750 |  |  |  | 1,459,750 |
Weighted average remaining contractual life of the Company's outstanding options |  |  |  |  |  |  | 6 years 3 months 18 days |
Weighted average remaining contractual life of the Company's exercisable options |  |  |  |  |  |  | 5 years 3 months 18 days |
Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares due to exercise of employee stock options and issuance of directors' deferred stock |  |  |  |  |  |  | 7,738 |
Director And Certain Officers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  | 248,000 |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  | 10 years |
Employee Stock Option | Officers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 4 years |

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