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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 | ​ | (514,050) | ​ | ​ | 32.53
Forfeited | ​ | (165,700) | ​ | ​ | 43.12
Performance adjustment | ​ | 196,550 | ​ | ​ | 32.58
Outstanding as of June 30, 2024 | ​ | 223,680 | ​ | $ | 37.45
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 | ​ | 960,857 | ​ | ​ | 33.76
Vested | ​ | (878,447) | ​ | ​ | 23.35
Forfeited | ​ | (270,847) | ​ | ​ | 27.78
Outstanding as of June 30, 2024 | ​ | 2,255,470 | ​ | $ | 26.74
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 |  | (482,448) | ​ | ​ | 20.57 | ​ | ​ | ​ | ​ | ​
Cancelled |  | (1,000) | ​ | ​ | 27.73 | ​ | ​ | ​ | ​ | ​
Outstanding as of June 30, 2024 |  | 693,302 | ​ | $ | 18.71 | ​ | 3.9 | ​ | $ | 9,354
Exercisable as of June 30, 2024 |  | 692,975 | ​ | $ | 18.71 | ​ | 3.9 | ​ | $ | 9,350
Summary of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
Selling, general and administrative | $ | 10,012 | ​ | $ | 7,072 | ​ | $ | 17,487 | ​ | $ | 13,107
Total stock-based compensation expense | $ | 10,012 | ​ | $ | 7,072 | ​ | $ | 17,487 | ​ | $ | 13,107

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