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EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2020
EQUITY |
Schedule of shares repurchased | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Shares | ​ | Aggregate Cost | ​ | Average | ​
Year ended December 31, |  | Repurchased |  | (in thousands) |  | Repurchase Price |
2020 |  | 129,273 | ​ | $ | 6,589 | ​ | $ | 50.97 | ​
2019 |  | 3,104 | ​ | ​ | 162 | ​ | ​ | 52.37 | ​
2018 |  | 30,427 | ​ | ​ | 1,576 | ​ | ​ | 51.82 | ​
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 | ​
2020 |  | 32,227 | ​ | $ | 1,733 | ​ | $ | 53.78 | ​
2019 |  | 42,703 | ​ | ​ | 2,419 | ​ | ​ | 56.65 | ​
2018 |  | 141,180 | ​ | ​ | 10,859 | ​ | ​ | 76.76 | ​
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2020 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | ​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Avg. | ​ | Contractual | ​ | Aggregate | ​
​ |  | Options |  | Exercise Price |  | Term (Years) |  | Intrinsic Value |
Outstanding at January 1, 2019 |  | 15,000 | ​ | $ | 49.34 | ​ | ​ | ​ | ​ | ​ | ​
Granted | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Forfeited |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2020 |  | 15,000 | ​ | ​ | 49.34 | ​ | 2.2 | ​ | $ | 34,600 | ​
Vested and expected to vest at December 31, 2020 |  | 15,000 | ​ | ​ | 49.34 | ​ | 2.2 | ​ | $ | 34,600 | ​
Exercisable at December 31, 2020 |  | 15,000 | ​ | ​ | 49.34 | ​ | 2.2 | ​ | $ | 34,600 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2018 |  | 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 | ​
​
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, 2020, 2019 and 2018 (in thousands, except fair value of options granted data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018 |
Aggregate intrinsic value of options exercised | ​ | $ | — | ​ | $ | 229 | ​ | $ | 5,927 | ​
Cash proceeds received upon exercise of options | ​ |  | — | ​ |  | — | ​ |  | 72 | ​
Summary of restricted stock activity | The following table summarizes restricted stock activity during the year ended December 31, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Weighted Avg. | ​
​ |  | Shares |  | Fair Value |
Unvested as of January 1, 2020 |  | 204,146 | ​ | $ | 60.13 | ​
Granted |  | 116,404 | ​ | ​ | 50.45 | ​
Forfeited |  | (3,323) | ​ | ​ | 59.99 | ​
Vested and issued |  | (93,604) | ​ | ​ | 61.75 | ​
Unvested as of December 31, 2020 |  | 223,623 | ​ | $ | 54.42 | ​
​ 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 | ​

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