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Stock Compensation Plans - Options Granted and Intrinsic Value (Details) - USD ($) | 12 Months Ended
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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

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