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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Stock-based Compensation |
Summary of performance share units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding as of December 31, 2023 | ​ | 503,880 | ​ | $ | 33.13
Granted | ​ | 203,000 | ​ | ​ | 45.06
Vested | ​ | (314,921) | ​ | ​ | 33.90
Forfeited | ​ | — | ​ | ​ | —
Performance adjustment | ​ | 119,721 | ​ | ​ | 34.26
Outstanding as of March 31, 2024 | ​ | 511,680 | ​ | $ | 37.66
Summary of restricted stock units activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding as of December 31, 2023 | ​ | 2,443,907 | ​ | $ | 22.88
Granted | ​ | 885,674 | ​ | ​ | 33.70
Vested | ​ | (685,436) | ​ | ​ | 23.06
Forfeited | ​ | (80,392) | ​ | ​ | 25.83
Outstanding as of March 31, 2024 | ​ | 2,563,753 | ​ | $ | 26.47
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted- |  | ​ | ​
​ | ​ | ​ |  | ​ | Weighted- |  | Average | ​ | ​ | ​
​ | ​ | ​ |  | ​ | Average |  | Remaining | ​ | ​ | Aggregate
​ | ​ | ​ | ​ | ​ | Exercise Price |  | Contractual | ​ | ​ | Intrinsic
​ |  | Shares |  | ​ | per Share |  | Term (in years) |  | ​ | Value
Outstanding as of December 31, 2023 |  | 1,176,750 | ​ | $ | 19.48 |  | 4.3 | ​ | $ | 13,297
Exercised |  | (200,200) | ​ | ​ | 20.96 | ​ | ​ | ​ | ​ | ​
Cancelled |  | (1,000) | ​ | ​ | 27.73 | ​ | ​ | ​ | ​ | ​
Outstanding as of March 31, 2024 |  | 975,550 | ​ | $ | 19.17 |  | 4.0 | ​ | $ | 19,172
Exercisable as of March 31, 2024 |  | 974,941 | ​ | $ | 19.17 | ​ | 4.0 | ​ | $ | 19,160
Summary of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended March 31,
​ | 2024 | ​ | 2023
Selling, general and administrative | $ | 7,475 | ​ | $ | 6,035
Total stock-based compensation expense | $ | 7,475 | ​ | $ | 6,035

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