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EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2019
EQUITY |
Schedule of shares repurchased | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Shares | ​ | Aggregate Cost | ​ | Average | ​
Year ended December 31, |  | Repurchased |  | (in thousands) |  | Repurchase Price |
2019 |  | 3,104 | ​ | $ | 162 | ​ | $ | 52.37 | ​
2018 |  | 30,427 | ​ | ​ | 1,577 | ​ | ​ | 51.82 | ​
2017 |  | 201,932 | ​ | ​ | 10,636 | ​ | ​ | 52.67 | ​
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 | ​
2019 |  | 42,703 | ​ | $ | 2,419 | ​ | $ | 56.65 | ​
2018 |  | 141,180 | ​ | ​ | 10,859 | ​ | ​ | 76.76 | ​
2017 |  | 32,814 | ​ | ​ | 2,348 | ​ | ​ | 72.50 | ​
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2019 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Avg. | ​ | Contractual | ​ | Aggregate | ​
​ |  | Options |  | Exercise Price |  | Term (Years) |  | Intrinsic Value |
Outstanding at January 1, 2019 |  | 42,000 | ​ | $ | 48.61 | ​ | ​ | ​ | ​ | ​ | ​
Granted | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Forfeited |  | (7,500) | ​ |  | 52.97 | ​ | ​ | ​ | ​ | ​ | ​
Expired |  | (2,500) | ​ |  | 52.97 | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (17,000) | ​ |  | 45.39 | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2019 |  | 15,000 | ​ | ​ | 49.34 | ​ | 3.2 | ​ | $ | 170,900 | ​
Vested and expected to vest at December 31, 2019 |  | 15,000 | ​ | ​ | 49.34 | ​ | 3.2 | ​ | $ | 170,900 | ​
Exercisable at December 31, 2019 |  | 15,000 | ​ | ​ | 49.34 | ​ | 3.2 | ​ | $ | 170,900 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2018 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Avg. | ​ | Contractual | ​ | Aggregate | ​
​ |  | Options |  | Exercise Price |  | Term (Years) |  | Intrinsic Value |
Outstanding at January 1, 2018 |  | 200,021 | ​ | $ | 41.76 | ​ | ​ | ​ | ​ | ​ | ​
Granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (158,021) | ​ |  | 39.95 | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2018 |  | 42,000 | ​ |  | 48.61 |  | 4.1 |  | $ | 823,515 | ​
Vested and expected to vest at December 31, 2018 |  | 42,000 | ​ |  | 48.61 |  | 4.1 |  | $ | 962,840 | ​
Exercisable at December 31, 2018 |  | 33,250 | ​ |  | 46.76 |  | 3.0 |  | $ | 823,515 | ​
​
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, 2019, 2018 and 2017 (in thousands, except fair value of options granted data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017 |
Weighted-average fair value of options granted | ​ | $ | — | ​ | $ | — | ​ | $ | 13.77 | ​
Aggregate intrinsic value of options exercised | ​ |  | 229 | ​ |  | 5,927 | ​ | ​ | 936 | ​
Cash proceeds received upon exercise of options | ​ |  | — | ​ |  | 72 | ​ | ​ | 1,030 | ​
Excess tax benefits from share-based compensation | ​ |  | — | ​ |  | — | ​ | ​ | — | ​
Schedule of weighted-average assumptions using Black-Scholes option-pricing model for estimating fair value of each option granted | ​
​ | ​ | ​
​ | 2017 | ​
​ | ​ | ​
Risk-free interest rate | 1.79 | %
Expected dividend yield | 1.28 | %
Expected life | 4.00 | years
Expected volatility | 34.01 | %
Summary of restricted stock activity | The following table summarizes restricted stock activity during the year ended December 31, 2019:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Weighted Avg. | ​
​ |  | Shares |  | Fair Value |
Unvested as of January 1, 2019 |  | 200,653 | ​ | $ | 65.21 | ​
Granted |  | 108,278 | ​ | ​ | 54.68 | ​
Forfeited |  | (18,579) | ​ | ​ | 57.04 | ​
Vested and issued |  | (86,206) | ​ | ​ | 65.77 | ​
Unvested as of December 31, 2019 |  | 204,146 | ​ | $ | 60.13 | ​
​ The following table summarizes restricted stock activity during the year ended December 31, 2018:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Weighted Avg. | ​
​ |  | Shares |  | Fair Value |
Unvested as of January 1, 2018 |  | 214,938 | ​ | $ | 68.62 | ​
Granted |  | 111,474 | ​ |  | 59.52 | ​
Forfeited |  | (31,327) | ​ |  | 66.53 | ​
Vested and issued |  | (94,432) | ​ |  | 66.27 | ​
Unvested as of December 31, 2018 |  | 200,653 | ​ | $ | 65.21 | ​

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