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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2022, 2021 and 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(000’s omitted, except per share data) |  | 2022 |  | 2021 |  | 2020
Net income | ​ | $ | 188,081 | ​ | $ | 189,694 | ​ | $ | 164,676
Income attributable to unvested stock-based compensation awards | ​ |  | (533) | ​ |  | (445) | ​ |  | (514)
Income available to common shareholders | ​ | $ | 187,548 | ​ | $ | 189,249 | ​ | $ | 164,162
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding – basic | ​ |  | 53,896 | ​ |  | 53,977 | ​ |  | 52,969
Basic earnings per share | ​ | $ | 3.48 | ​ | $ | 3.51 | ​ | $ | 3.10
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 188,081 | ​ | $ | 189,694 | ​ | $ | 164,676
Income attributable to unvested stock-based compensation awards | ​ |  | (533) | ​ |  | (445) | ​ |  | (514)
Income available to common shareholders | ​ | $ | 187,548 | ​ | $ | 189,249 | ​ | $ | 164,162
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding | ​ |  | 53,896 | ​ |  | 53,977 | ​ |  | 52,969
Assumed exercise of stock options | ​ |  | 312 | ​ |  | 423 | ​ |  | 352
Weighted-average common shares outstanding – diluted | ​ |  | 54,208 | ​ |  | 54,400 | ​ |  | 53,321
Diluted earnings per share | ​ | $ | 3.46 | ​ | $ | 3.48 | ​ | $ | 3.08
Cash dividends declared per share | ​ | $ | 1.74 | ​ | $ | 1.70 | ​ | $ | 1.66
​

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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