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Stock Compensation Plans - Options Granted and Intrinsic Value (Details) - USD ($) | 12 Months Ended
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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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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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