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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2018
EARNINGS PER SHARE [Abstract] |
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, 2018 and 2017:
|  | Three Months Ended March 31, |
(000's omitted, except per share data) |  | 2018 |  |  | 2017 |
Net income |  | $ | 40,106 |  |  | $ | 26,257 |
Income attributable to unvested stock-based compensation awards |  |  | (141 | ) |  |  | (138 | )
Income available to common shareholders |  | $ | 39,965 |  |  | $ | 26,119 |
Weighted-average common shares outstanding – basic |  |  | 50,934 |  |  |  | 45,284 |
Basic earnings per share |  | $ | 0.78 |  |  | $ | 0.58 |
Net income |  | $ | 40,106 |  |  | $ | 26,257 |
Income attributable to unvested stock-based compensation awards |  |  | (141 | ) |  |  | (138 | )
Income available to common shareholders |  | $ | 39,965 |  |  | $ | 26,119 |
Weighted-average common shares outstanding – basic |  |  | 50,934 |  |  |  | 45,284 |
Assumed exercise of stock options |  |  | 563 |  |  |  | 703 |
Weighted-average common shares outstanding – diluted |  |  | 51,497 |  |  |  | 45,987 |
Diluted earnings per share |  | $ | 0.78 |  |  | $ | 0.57 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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