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Stock Compensation Plans - Options Granted and Intrinsic Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock Compensation Plans
Options granted	214,800	210,300	208,400
The total intrinsic value of options exercised	$ 2,700,000	$ 354,000	$ 2,600,000
Proceeds from Stock Options Exercised	10,096,000	884,000	6,258,000
The actual tax benefit realized for the tax deductions from option exercises	2,500,000	212,000	2,300,000
The total intrinsic value of options outstanding	5,400,000	7,400,000	6,700,000
The total intrinsic value of options exercisable	$ 3,300,000	$ 4,500,000	$ 4,100,000

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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