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EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2017
EQUITY |
Schedule of shares repurchased |
|  |  |  | Aggregate |  |  |  |
|  | Shares |  | Cost |  | Average |
Year ended December 31, |  | Repurchased |  | (in thousands) |  | Repurchase Price |
2017 |  | 201,932 |  | $ | 10,636 |  | $ | 52.67 |
2016 |  | 32,407 |  |  | 2,195 |  |  | 64.72 |
2015 |  | — |  |  | — |  |  | — |
Schedule of repurchases of shares from employees to satisfy tax withholding and stock exercise obligations |
|  |  |  | Aggregate |  |  |  |
|  | Shares |  | Cost |  | Average |
Year ended December 31, |  | Repurchased |  | (in thousands) |  | Repurchase Price |
2017 |  | 32,814 |  | $ | 2,348 |  | $ | 71.54 |
2016 |  | 38,279 |  |  | 2,775 |  |  | 72.50 |
2015 |  | 37,567 |  |  | 2,705 |  |  | 72.01 |
Summary of stock option activity |
|  | Year Ended December 31, 2017 |
|  |  |  |  |  |  | Weighted Average |  |  |  |
|  |  |  | Weighted Avg. |  | Remaining |  |  |  |
|  | Number of |  | Exercise |  | Contractual |  | Aggregate |
|  | Options |  | Price |  | Term (Years) |  | Intrinsic Value |
Outstanding at January 1, 2017 |  | 225,822 |  | $ | 39.77 |  |  |  |  |  |
Granted |  | 10,000 |  |  | 52.97 |  |  |  |  |  |
Exercised |  | (35,801) |  |  | 32.29 |  |  |  |  |  |
Outstanding at December 31, 2017 |  | 200,021 |  |  | 41.76 |  | 3.6 |  | $ | 2,780,253 |
Vested and expected to vest at December 31, 2017 |  | 200,021 |  |  | 41.76 |  | 3.6 |  | $ | 2,780,253 |
Exercisable at December 31, 2017 |  | 187,521 |  |  | 40.77 |  | 3.6 |  | $ | 2,757,353 |
|  | Year Ended December 31, 2016 |
|  |  |  |  |  |  | Weighted Average |  |  |  |
|  |  |  |  |  |  | Remaining |  |  |  |
|  | Number of |  | Weighted Avg. |  | Contractual |  | Aggregate |
|  | Options |  | Exercise Price |  | Term (Years) |  | Intrinsic Value |
Outstanding at January 1, 2016 |  | 268,875 |  | $ | 38.64 |  |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |  |
Exercised |  | (43,053) |  |  | 32.70 |  |  |  |  |  |
Outstanding at December 31, 2016 |  | 225,822 |  |  | 39.77 |  | 3.9 |  | $ | 9,114,963 |
Vested and expected to vest at December 31, 2016 |  | 225,554 |  |  | 39.73 |  | 3.9 |  | $ | 9,112,630 |
Exercisable at December 31, 2016 |  | 222,072 |  |  | 39.23 |  | 3.8 |  | $ | 9,082,338 |
Summary of information relating to options granted and exercised | The following table summarizes information relating to options granted and exercised during the years ended December 31, 2017, 2016 and 2015 (in thousands, except fair value of options granted data):
|  | 2017 |  | 2016 |  | 2015 |
Weighted-average fair value of options granted |  | $ | 13.77 |  | $ | — |  | $ | 30.70 |
Aggregate intrinsic value of options exercised |  |  | 936 |  |  | 1,591 |  |  | 3,488 |
Cash proceeds received upon exercise of options |  |  | 1,030 |  |  | 649 |  |  | 1,998 |
Excess tax benefits from share-based compensation |  |  | — |  |  | 591 |  |  | 1,423 |
Schedule of weighted-average assumptions using Black-Scholes option-pricing model for estimating fair value of each option granted |
|  | 2017 |  | 2016 |  | 2015 |
Risk-free interest rate |  | 1.79 | % | — |  | 1.55 | %
Expected dividend yield |  | 1.28 | % | — |  | 1.76 | %
Expected life |  | 4.00 | years | — |  | 6.25 | years
Expected volatility |  | 34.01 | % | — |  | 51.85 | %
Summary of restricted stock activity | The following table summarizes restricted stock activity during the year ended December 31, 2017:
|  |  |  | Weighted Avg. |
|  | Shares |  | Fair Value |
Unvested as of January 1, 2017 |  | 229,040 |  | $ | 67.13 |
Granted |  | 95,095 |  |  | 68.09 |
Forfeited |  | (12,074) |  |  | 69.71 |
Vested and issued |  | (97,123) |  |  | 64.01 |
Unvested as of December 31, 2017 |  | 214,938 |  | $ | 68.62 |
The following table summarizes restricted stock activity during the year ended December 31, 2016:
|  |  |  | Weighted Avg. |
|  | Shares |  | Fair Value |
Unvested as of January 1, 2016 |  | 218,401 |  | $ | 60.60 |
Granted |  | 100,005 |  |  | 73.34 |
Forfeited |  | (1,125) |  |  | 66.44 |
Vested and issued |  | (88,241) |  |  | 58.01 |
Unvested as of December 31, 2016 |  | 229,040 |  | $ | 67.13 |

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