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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2019
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 years ended December 31, 2019, 2018 and 2017.
(000’s omitted, except per share data) |  | 2019 |  |  | 2018 |  |  | 2017 |
Net income |  | $ | 169,063 |  |  | $ | 168,641 |  |  | $ | 150,717 |
Income attributable to unvested stock-based compensation awards |  |  | (400 | ) |  |  | (744 | ) |  |  | (597 | )
Income available to common shareholders |  | $ | 168,663 |  |  | $ | 167,897 |  |  | $ | 150,120 |
Weighted-average common shares outstanding - basic |  |  | 51,732 |  |  |  | 51,165 |  |  |  | 48,843 |
Basic earnings per share |  | $ | 3.26 |  |  | $ | 3.28 |  |  | $ | 3.07 |
Net income |  | $ | 169,063 |  |  | $ | 168,641 |  |  | $ | 150,717 |
Income attributable to unvested stock-based compensation awards |  |  | (400 | ) |  |  | (744 | ) |  |  | (597 | )
Income available to common shareholders |  | $ | 168,663 |  |  | $ | 167,897 |  |  | $ | 150,120 |
Weighted-average common shares outstanding |  |  | 51,732 |  |  |  | 51,165 |  |  |  | 48,843 |
Assumed exercise of stock options |  |  | 516 |  |  |  | 583 |  |  |  | 627 |
Weighted-average common shares outstanding – diluted |  |  | 52,248 |  |  |  | 51,748 |  |  |  | 49,470 |
Diluted earnings per share |  | $ | 3.23 |  |  | $ | 3.24 |  |  | $ | 3.03 |
Cash dividends declared per share |  | $ | 1.58 |  |  | $ | 1.44 |  |  | $ | 1.32 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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