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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020, 2019 and 2018. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(000’s omitted, except per share data) |  | 2020 |  | 2019 |  | 2018
Net income | ​ | $ | 164,676 | ​ | $ | 169,063 | ​ | $ | 168,641
Income attributable to unvested stock-based compensation awards | ​ |  | (514) | ​ |  | (400) | ​ |  | (744)
Income available to common shareholders | ​ | $ | 164,162 | ​ | $ | 168,663 | ​ | $ | 167,897
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding - basic | ​ |  | 52,969 | ​ |  | 51,732 | ​ |  | 51,165
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic earnings per share | ​ | $ | 3.10 | ​ | $ | 3.26 | ​ | $ | 3.28
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 164,676 | ​ | $ | 169,063 | ​ | $ | 168,641
Income attributable to unvested stock-based compensation awards | ​ |  | (514) | ​ |  | (400) | ​ |  | (744)
Income available to common shareholders | ​ | $ | 164,162 | ​ | $ | 168,663 | ​ | $ | 167,897
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding | ​ |  | 52,969 | ​ |  | 51,732 | ​ |  | 51,165
Assumed exercise of stock options | ​ |  | 352 | ​ |  | 516 | ​ |  | 583
Weighted-average common shares outstanding – diluted | ​ |  | 53,321 | ​ |  | 52,248 | ​ |  | 51,748
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted earnings per share | ​ | $ | 3.08 | ​ | $ | 3.23 | ​ | $ | 3.24
Cash dividends declared per share | ​ | $ | 1.66 | ​ | $ | 1.58 | ​ | $ | 1.44
​

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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 http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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