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Stock-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 | May 07, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred compensation (in shares) | 118,183 |  |  |  |  |  |  |  | 7,429 |
Shares due to exercise of employee stock options and issuance of directors' deferred stock |  |  | 743,000 | 6,038,000 | 910 | 984,000 | 3,109,000 | 11,745 |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 250,500 |
Stock option expense |  |  |  |  |  |  |  |  | $ 1,000,000 |
Future expense |  |  | $ 2,000,000 |  |  |  |  |  | 2,000,000 |
Exercised |  |  |  |  |  |  |  |  | $ 3,450 | $ 85,268
Closing share price (in usd per share) |  |  | $ 44.06 |  |  |  |  |  | $ 44.06 |
Share-based compensation arrangement by share-based payment award, options, grants since inception |  |  | 1,397,625 |  |  |  |  |  | 1,397,625 |
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 |  |  |  |  |  |  |  |  | 7,874 |
Directors |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 250,500 |  |  |  |  |  |  |  |
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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