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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary of option activity |
|  | Stock Awards Plans |  | Director Stock Option Plans |
|  |  |  |  | Weighted Average |  |  |  | Weighted Average |
|  |  | Options |  | Exercise Price |  | Options |  | Exercise Price |
Outstanding, January 1, 2015 |  |  | 8,107,806 |  | $ | 46.74 |  | 368,668 |  | $ | 53.52 |
Granted |  |  | 1,391,355 |  |  | 64.60 |  | — |  |  | — |
Exercised |  |  | (1,416,507) |  |  | 37.15 |  | (65,167) |  |  | 41.93 |
Forfeited or expired |  |  | (50,624) |  |  | 60.84 |  | — |  |  | — |
Outstanding at December 31, 2015 |  |  | 8,032,030 |  | $ | 51.44 |  | 303,501 |  | $ | 56.00 |
Exercisable at December 31, 2015 |  |  | 5,324,545 |  | $ | 45.23 |  | 221,159 |  | $ | 53.22 |
Weighted-Average Remaining Contractual Term (Years): |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 6.1 |  |  |  |  | 6.8 |  |  |  |
Exercisable at December 31, 2015 |  |  | 4.9 |  |  |  |  | 6.4 |  |  |  |
Aggregate Intrinsic Value: |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  | $ | 170,340 |  |  |  | $ | 5,052 |  |  |  |
Exercisable at December 31, 2015 |  | $ | 145,978 |  |  |  | $ | 4,297 |  |  |  |
Intrinsic Value of Options Exercised During the Years Ended: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2015 |  | $ | 43,041 |  |  |  | $ | 1,478 |  |  |  |
December 31, 2014 |  | $ | 33,059 |  |  |  | $ | 741 |  |  |  |
December 31, 2013 |  | $ | 37,822 |  |  |  | $ | 732 |  |  |  |
Summary of restricted stock unit activity |
|  |  |  |  |  |  | Director Restricted |
|  | Stock Awards Plans |  | Stock Unit Plan |
|  |  |  | Weighted Average |  |  |  | Weighted Average |
|  | RSUs |  | Grant‑Date Fair Value |  | RSUs |  | Grant-Date Fair Value |
Nonvested at January 1, 2015 |  | 61,750 |  | $ | 64.09 |  | — |  | $ | — |
Granted |  | 17,957 |  |  | 67.96 |  | 18,857 |  |  | 63.10 |
Vested |  | (13,331) |  |  | 56.75 |  | — |  |  | — |
Nonvested at December 31, 2015 |  | 66,376 |  | $ | 66.61 |  | 18,857 |  | $ | 63.10 |
Stock Option Plans |
Weighted-average assumptions used to estimate fair value of stock options granted |
Stock Awards Plans: |  | 2015 |  | 2014 |  | 2013 |
Years ended December 31, |  |  |  |  |  |  |
Dividend Yield |  | 1.7 | % | 1.7 | % | 1.8 | %
Expected Stock Price Volatility |  | 21.9 | % | 22.2 | % | 22.7 | %
Risk-free Interest Rate |  | 1.6 | % | 2.3 | % | 1.3 | %
Expected Life of Option (years) |  | 6.9 |  | 6.9 |  | 6.9 |
Director Stock Option Plans |
Weighted-average assumptions used to estimate fair value of stock options granted |
Director Stock Option Plans: |  |  |  |  |
Years ended December 31, |  | 2014 |  | 2013 |
Dividend Yield |  | 1.8 | % | 1.9 | %
Expected Stock Price Volatility |  | 22.2 | % | 23.0 | %
Risk-free Interest Rate |  | 2.2 | % | 1.3 | %
Expected Life of Option (years) |  | 6.9 |  | 6.9 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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