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STOCK COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2016
Stock Options Fair Value Assumptions | The weighted-average Black-Scholes assumptions used in estimating the fair value of stock options granted during the period, along with the weighted-average grant-date fair values, were as follows.
|  | Three months ended March 31, |
|  | 2016 |  |  | 2015 |
Expected volatility |  |  | 20 | % |  |  | 20 | %
Expected life (in years) |  |  | 5.5 |  |  |  | 5.5 |
Risk-free interest rate |  |  | 1.4 | % |  |  | 1.7 | %
Dividend yield |  |  | 1.2 | % |  |  | 3.0 | %
Fair value per stock option |  |  | $7 |  |  |  | $9 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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