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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of option activity |
|  | Stock Awards Plans |  | Director Stock Option Plans |
|  |  |  |  | Weighted Average |  |  |  | Weighted Average |
|  |  | Options |  | Exercise Price |  | Options |  | Exercise Price |
Outstanding, January 1, 2016 |  |  | 8,032,030 |  | $ | 51.44 |  | 303,501 |  | $ | 56.00 |
Granted |  |  | 1,481,180 |  |  | 71.17 |  | — |  |  | — |
Exercised |  |  | (1,304,374) |  |  | 42.20 |  | (22,167) |  |  | 50.37 |
Forfeited or expired |  |  | (138,392) |  |  | 62.49 |  | — |  |  | — |
Outstanding at December 31, 2016 |  |  | 8,070,444 |  | $ | 56.36 |  | 281,334 |  | $ | 56.45 |
Exercisable at December 31, 2016 |  |  | 5,317,690 |  | $ | 50.06 |  | 255,998 |  | $ | 55.44 |
Weighted-Average Remaining Contractual Term (Years): |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 6.1 |  |  |  |  | 5.9 |  |  |  |
Exercisable at December 31, 2016 |  |  | 4.9 |  |  |  |  | 5.7 |  |  |  |
Aggregate Intrinsic Value: |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  | $ | 137,933 |  |  |  | $ | 4,783 |  |  |  |
Exercisable at December 31, 2016 |  | $ | 124,425 |  |  |  | $ | 4,610 |  |  |  |
Intrinsic Value of Options Exercised During the Years Ended: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2016 |  | $ | 44,972 |  |  |  | $ | 548 |  |  |  |
December 31, 2015 |  | $ | 43,041 |  |  |  | $ | 1,478 |  |  |  |
December 31, 2014 |  | $ | 33,059 |  |  |  | $ | 741 |  |  |  |
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, 2016 |  | 66,376 |  | $ | 66.61 |  | 18,857 |  | $ | 63.10 |
Granted |  | 21,754 |  |  | 73.45 |  | 15,745 |  |  | 75.56 |
Vested |  | (11,371) |  |  | 61.96 |  | (18,857) |  |  | 63.10 |
Forfeited |  | (4,632) |  |  | 68.00 |  | — |  |  | — |
Nonvested at December 31, 2016 |  | 72,127 |  | $ | 69.31 |  | 15,745 |  | $ | 75.56 |
Stock Awards Plans |
Weighted-average assumptions used to estimate fair value of stock options granted |
Stock Awards Plans: |  |  |  |  |  |  |
Years Ended December 31, |  | 2016 |  | 2015 |  | 2014 |
Dividend Yield |  | 1.8 | % | 1.7 | % | 1.7 | %
Expected Stock Price Volatility |  | 16.9 | % | 21.9 | % | 22.2 | %
Risk-free Interest Rate |  | 1.6 | % | 1.6 | % | 2.3 | %
Expected Life of Option (years) |  | 6.7 |  | 6.9 |  | 6.9 |
Director Stock Option Plans |
Weighted-average assumptions used to estimate fair value of stock options granted |
Director Stock Option Plans: |  |  |
Year Ended December 31, |  | 2014 |
Dividend Yield |  | 1.8 | %
Expected Stock Price Volatility |  | 22.2 | %
Risk-free Interest Rate |  | 2.2 | %
Expected Life of Option (years) |  | 6.9 |

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