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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2015
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used to estimate the fair value of options granted |
|  | 2015 |  | 2014 |  | 2013
Dividend yield |  | 0.0% |  | 0.0% |  | 0.0%
Expected volatility |  | 37.1% |  | 41.4% |  | 47.5%
Risk-free interest rate |  | 1.57% |  | 1.55% |  | 0.98%
Expected term |  | 5.8 Years |  | 5.8 Years |  | 5.7 Years
Summary of Company's activities with respect to its stock option plans |
Options |  | Number of Shares (In thousands) |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (In years) |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2015 |  | 13,066 |  | $ | 19.73 |  | 3.1 |  | $ | 1,158,412 |
Granted 01/01/15 - 03/31/15 |  | 903 |  | $ | 133.68 |  |  |  |  |
Granted 04/01/15 - 06/30/15 |  | 33 |  | $ | 133.43 |  |  |  |  |
Granted 07/01/15 - 09/30/15 |  | 56 |  | $ | 135.00 |  |  |  |  |
Granted 10/01/15 - 12/31/15 |  | 6 |  | $ | 134.20 |  |  |  |  |
Exercised |  | (7,379) |  | $ | 6.69 |  |  |  |  |
Cancelled or forfeited |  | (95) |  | $ | 71.59 |  |  |  |  |
Outstanding at December 31, 2015 |  | 6,590 |  | $ | 50.85 |  | 5.6 |  | $ | 646,497 |
Vested and expected to vest in the future at December 31, 2015 |  | 6,238 |  | $ | 48.05 |  | 5.5 |  | $ | 629,496 |
Exercisable at December 31, 2015 |  | 3,899 |  | $ | 24.36 |  | 3.9 |  | $ | 485,835 |
Summary of information about stock options outstanding and exercisable | The following table summarizes information about stock options outstanding and exercisable at December 31, 2015:
|  | Options Outstanding |  | Options Exercisable |
|  |  |  | Weighted |  |  |  |  |  |  |
|  |  |  | Average |  | Weighted |  | Number |  | Weighted |
|  | Number |  | Remaining |  | Average |  | Exercisable |  | Average |
Range of Exercise |  | Outstanding (In |  | Contractual |  | Exercise |  | (In |  | Exercise |
Prices ($) |  | Thousands) |  | Term (Years) |  | Price ($) |  | Thousands) |  | Price ($) |
$13.53 | - | $13.53 |  | 33 |  | 2.9 |  | $ 13.53 |  | 33 |  | $ 13.53 |
$15.86 | - | $15.86 |  | 1,663 |  | 2.4 |  | $ 15.86 |  | 1,663 |  | $ 15.86 |
$16.84 | - | $16.84 |  | 18 |  | 3.1 |  | $ 16.84 |  | 18 |  | $ 16.84 |
$17.82 | - | $17.82 |  | 1,147 |  | 3.9 |  | $ 17.82 |  | 1,147 |  | $ 17.82 |
$18.07 | - | $47.13 |  | 956 |  | 5.7 |  | $ 36.58 |  | 498 |  | $ 28.06 |
$47.65 | - | $57.25 |  | 665 |  | 7.2 |  | $ 54.69 |  | 299 |  | $ 54.06 |
$57.45 | - | $69.00 |  | 255 |  | 7.4 |  | $ 63.23 |  | 56 |  | $ 63.89 |
$70.06 | - | $70.06 |  | 661 |  | 8.2 |  | $ 70.06 |  | 165 |  | $ 70.06 |
$70.54 | - | $135.03 |  | 363 |  | 9.0 |  | $ 114.18 |  | 20 |  | $ 109.79 |
$135.48 | - | $141.13 |  | 829 |  | 9.2 |  | $ 135.55 |  | - |  | $ 0.00 |
|  |  |  | 6,590 |  | 5.6 |  | $ 50.85 |  | 3,899 |  | $ 24.36 |
Summary of Company's activities with respect to non-vested restricted stock units |
|  | Number of Shares (in thousands) |  | Weighted Average Grant-Date Fair Value |
Non-vested at January 1, 2015 |  | 149 |  | $ | 61.09 |
Granted 01/01/15 - 03/31/15 |  | 83 |  | 135.48 |
Granted 04/01/15 - 06/30/15 |  | - |  | - |
Granted 07/01/15 - 09/30/15 |  | 8 |  | 147.36 |
Granted 10/01/15 - 12/31/15 |  | - |  | - |
Vested |  | (48) |  | 59.32 |
Forfeited/cancelled |  | (14) |  | 63.57 |
Non-vested at December 31, 2015 |  | 178 |  | $ | 99.58 |
Schedule of total compensation cost relating to incentive stock option, charged against income |
|  | 2015 |  | 2014 |  | 2013 |
Operating expenses |  | $ | 32,719 |  | $ | 28,552 |  | $ | 28,764 |
Total employee and non-employee share-based compensation expense included in income, before income tax |  | 32,719 |  | 28,552 |  | 28,764 |
Less: Amount of income tax benefit recognized in earnings |  | (9,058) |  | (2,932) |  | (7,730) |
Amount charged against net income |  | $ | 23,661 |  | $ | 25,620 |  | $ | 21,034 |

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