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Stock Compensation Plans - Options Granted and Intrinsic Value (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stock Compensation Plans      
Options granted 210,300 208,400 202,700
The total intrinsic value of options exercised $ 354,000 $ 2,600,000 $ 1,400,000
Proceeds from Stock Options Exercised 884,000 6,258,000 3,700,000
The actual tax benefit realized for the tax deductions from option exercises 212,000 2,300,000 1,200,000
The total intrinsic value of options outstanding 7,400,000 6,700,000 9,200,000
The total intrinsic value of options exercisable $ 4,500,000 $ 4,100,000 $ 5,300,000