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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2020
EARNINGS PER SHARE |
Reconciliation of Basic to Diluted Earnings per Share | The following is a reconciliation of basic to diluted earnings per share for the three and nine months ended September 30, 2020 and 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(000's omitted, except per share data) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Net income | ​ | $ | 42,809 | ​ | $ | 39,218 | ​ | $ | 118,191 | ​ | $ | 126,179
Income attributable to unvested stock-based compensation awards | ​ |  | (147) | ​ |  | (102) | ​ |  | (432) | ​ |  | (331)
Income available to common shareholders | ​ | $ | 42,662 | ​ | $ | 39,116 | ​ | $ | 117,759 | ​ | $ | 125,848
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding – basic | ​ |  | 53,650 | ​ |  | 51,750 | ​ |  | 52,727 | ​ |  | 51,644
Basic earnings per share | ​ | $ | 0.80 | ​ | $ | 0.76 | ​ | $ | 2.23 | ​ | $ | 2.44
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income | ​ | $ | 42,809 | ​ | $ | 39,218 | ​ | $ | 118,191 | ​ | $ | 126,179
Income attributable to unvested stock-based compensation awards | ​ |  | (147) | ​ |  | (102) | ​ |  | (432) | ​ |  | (331)
Income available to common shareholders | ​ | $ | 42,662 | ​ | $ | 39,116 | ​ | $ | 117,759 | ​ | $ | 125,848
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average common shares outstanding – basic | ​ |  | 53,650 | ​ |  | 51,750 | ​ |  | 52,727 | ​ |  | 51,644
Assumed exercise of stock options | ​ |  | 324 | ​ |  | 496 | ​ |  | 356 | ​ |  | 522
Weighted-average common shares outstanding – diluted | ​ |  | 53,974 | ​ |  | 52,246 | ​ |  | 53,083 | ​ |  | 52,166
Diluted earnings per share | ​ | $ | 0.79 | ​ | $ | 0.75 | ​ | $ | 2.22 | ​ | $ | 2.41

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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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