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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2022
STOCK-BASED COMPENSATION |
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average grant
​ |  | Shares |  | date fair value
Nonvested stock at December 31, 2021 |  | 443,319 | ​ | $ | 99.22
Granted |  | 253,860 | ​ | ​ | 120.77
Vested |  | (176,343) | ​ | ​ | 98.19
Forfeited |  | (20,438) | ​ | ​ | 98.98
Nonvested stock at March 31, 2022 |  | 500,398 | ​ | $ | 110.52
Summary of performance-based restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average grant
​ |  | Shares |  | date fair value
Nonvested stock at December 31, 2021 |  | 152,410 | ​ | $ | 108.41
Granted |  | 62,388 | ​ | ​ | 142.05
Vested |  | (16,834) | ​ | ​ | 96.00
Forfeited |  | (33,542) | ​ | ​ | 95.40
Nonvested stock at March 31, 2022 |  | 164,422 | ​ | $ | 125.10

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