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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2023
EARNINGS PER SHARE |
Schedule of reconciliation of basic to diluted earnings per share | The following is a reconciliation of basic to diluted earnings per share for the years ended December 31, 2023, 2022 and 2021. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(000’s omitted, except per share data) |  | 2023 |  | 2022 |  | 2021
Net income | ​ | $ | 131,924 | ​ | $ | 188,081 | ​ | $ | 189,694
Income attributable to unvested stock-based compensation awards | ​ |  | (447) | ​ |  | (533) | ​ |  | (445)
Income available to common shareholders | ​ | $ | 131,477 | ​ | $ | 187,548 | ​ | $ | 189,249
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding – basic | ​ |  | 53,601 | ​ |  | 53,896 | ​ |  | 53,977
Basic earnings per share | ​ | $ | 2.45 | ​ | $ | 3.48 | ​ | $ | 3.51
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 131,924 | ​ | $ | 188,081 | ​ | $ | 189,694
Income attributable to unvested stock-based compensation awards | ​ |  | (447) | ​ |  | (533) | ​ |  | (445)
Income available to common shareholders | ​ | $ | 131,477 | ​ | $ | 187,548 | ​ | $ | 189,249
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding – basic | ​ |  | 53,601 | ​ |  | 53,896 | ​ |  | 53,977
Assumed exercise of stock options | ​ |  | 124 | ​ |  | 312 | ​ |  | 423
Weighted-average common shares outstanding – diluted | ​ |  | 53,725 | ​ |  | 54,208 | ​ |  | 54,400
Diluted earnings per share | ​ | $ | 2.45 | ​ | $ | 3.46 | ​ | $ | 3.48
Cash dividends declared per share | ​ | $ | 1.78 | ​ | $ | 1.74 | ​ | $ | 1.70
​

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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