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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2021
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 three months ended March 31, 2021 and 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​
​ | ​ | March 31, | ​
(000’s omitted, except per share data) | ​ | 2021 |  | 2020 |
Net income | ​ | $ | 52,850 | ​ | $ | 40,134 | ​
Income attributable to unvested stock-based compensation awards | ​ |  | (130) | ​ |  | (146) | ​
Income available to common shareholders | ​ | $ | 52,720 | ​ | $ | 39,988 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding – basic | ​ |  | 53,845 | ​ |  | 52,036 | ​
Basic earnings per share | ​ | $ | 0.98 | ​ | $ | 0.77 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 52,850 | ​ | $ | 40,134 | ​
Income attributable to unvested stock-based compensation awards | ​ |  | (130) | ​ |  | (146) | ​
Income available to common shareholders | ​ | $ | 52,720 | ​ | $ | 39,988 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding – basic | ​ |  | 53,845 | ​ |  | 52,036 | ​
Assumed exercise of stock options | ​ |  | 438 | ​ |  | 420 | ​
Weighted-average common shares outstanding – diluted | ​ |  | 54,283 | ​ |  | 52,456 | ​
Diluted earnings per share | ​ | $ | 0.97 | ​ | $ | 0.76 | ​

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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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