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Stock-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Narrative (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2022 | Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred compensation (in shares) | 115,578 | 1,873 |
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) |  | 8,007 | 910
Stock option expense |  | $ 300,000 |
Future expense | $ 1,400,000 | 1,400,000 |
Exercised |  | $ 43,548 |
Closing share price (in usd per share) | $ 52.70 | $ 52.70 |
Share-based compensation arrangement by share-based payment award, options, grants since inception | 625,875 | 625,875 |
Weighted average remaining contractual life of the Company's outstanding options |  | 6 years |
Weighted average remaining contractual life of the Company's exercisable options |  | 5 years |
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 (in shares) |  | 6,535 |
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period |  | 10 years |
Employee Stock Option | Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period |  | 4 years |

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