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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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