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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015, 2014 and 2013.
(000's omitted, except per share data) |  | 2015 |  |  | 2014 |  |  | 2013 |
Net income |  | $ | 91,230 |  |  | $ | 91,353 |  |  | $ | 78,829 |
Income attributable to unvested stock-based compensation awards |  |  | (453 | ) |  |  | (456 | ) |  |  | (433 | )
Income available to common shareholders |  | $ | 90,777 |  |  | $ | 90,897 |  |  | $ | 78,396 |
Weighted-average common shares outstanding - basic |  |  | 40,996 |  |  |  | 40,548 |  |  |  | 40,000 |
Basic earnings per share |  | $ | 2.21 |  |  | $ | 2.24 |  |  | $ | 1.96 |
Net income |  | $ | 91,230 |  |  | $ | 91,353 |  |  | $ | 78,829 |
Income attributable to unvested stock-based compensation awards |  |  | (453 | ) |  |  | (456 | ) |  |  | (433 | )
Income available to common shareholders |  | $ | 90,777 |  |  | $ | 90,897 |  |  | $ | 78,396 |
Weighted-average common shares outstanding |  |  | 40,996 |  |  |  | 40,548 |  |  |  | 40,000 |
Assumed exercise of stock options |  |  | 405 |  |  |  | 481 |  |  |  | 504 |
Weighted-average common shares outstanding – diluted |  |  | 41,401 |  |  |  | 41,029 |  |  |  | 40,504 |
Diluted earnings per share |  | $ | 2.19 |  |  | $ | 2.22 |  |  | $ | 1.94 |
Cash dividends declared per share |  | $ | 1.22 |  |  | $ | 1.16 |  |  | $ | 1.10 |

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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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