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EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2021
EQUITY |
Summary of repurchased shares of the company's common stock under the share repurchase program | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Average Repurchase | ​ | Amount of Repurchases
​ | Shares Repurchased | ​ | Price Per Share | ​ | (in millions)
2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fourth quarter | ​ | — | ​ | $ | — | ​ | $ | —
Third quarter |  | — | ​ | ​ | — | ​ | ​ | —
Second quarter |  | 331,373 | ​ | ​ | 101.57 | ​ | ​ | 33.7
First quarter |  | 490,632 | ​ | ​ | 96.97 | ​ | ​ | 47.6
Total open market common stock repurchases |  | 822,005 | ​ | ​ | ​ | ​ | ​ | 81.3
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2020 |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fourth quarter | ​ | 1,013,709 | ​ | $ | 86.79 | ​ | $ | 88.0
Third quarter |  | 465,366 | ​ | ​ | 89.92 | ​ | ​ | 41.8
Second quarter | ​ | 992,159 | ​ | ​ | 100.54 | ​ | ​ | 99.8
First quarter | ​ | 1,062,881 | ​ | ​ | 112.46 | ​ | ​ | 119.5
Total open market common stock repurchases | ​ | 3,534,115 | ​ | ​ | ​ | ​ | ​ | 349.1
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fourth quarter | ​ | 600,442 | ​ | $ | 115.76 | ​ | $ | 69.5
Third quarter | ​ | 453,319 | ​ | ​ | 115.49 | ​ | ​ | 52.4
Second quarter | ​ | 100 | ​ | ​ | 104.75 | ​ | ​ | 0.01
First quarter | ​ | 366,793 | ​ | ​ | 95.36 | ​ | ​ | 35.0
Total open market common stock repurchases | ​ | 1,420,654 | ​ | ​ | ​ | ​ | ​ | 156.9

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