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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2024
STOCK-BASED COMPENSATION |
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average grant
​ |  | Shares |  | date fair value
Nonvested stock at December 31, 2023 |  | 638,181 | ​ | $ | 125.25
Granted |  | 223,399 | ​ | ​ | 183.04
Vested |  | (263,071) | ​ | ​ | 113.90
Forfeited |  | (20,307) | ​ | ​ | 144.77
Nonvested stock at June 30, 2024 |  | 578,202 | ​ | $ | 152.06
Summary of performance-based restricted stock units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average grant
​ |  | Shares |  | date fair value
Nonvested stock at December 31, 2023 |  | 134,484 | ​ | $ | 127.72
Granted |  | 86,996 | ​ | ​ | 145.21
Vested |  | (110,376) | ​ | ​ | 100.50
Forfeited |  | — | ​ | ​ | —
Nonvested stock at June 30, 2024 |  | 111,104 | ​ | $ | 168.45

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (c) -Paragraph 2 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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