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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 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 September 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 | ​ | 1,205,775 | ​ | ​ | 34.63
Vested | ​ | (940,377) | ​ | ​ | 23.22
Forfeited | ​ | (276,827) | ​ | ​ | 27.94
Outstanding as of September 30, 2024 | ​ | 2,432,478 | ​ | $ | 27.99
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 |  | (491,527) | ​ | ​ | 20.49 | ​ | ​ | ​ | ​ | ​
Cancelled |  | (1,000) | ​ | ​ | 27.73 | ​ | ​ | ​ | ​ | ​
Outstanding as of September 30, 2024 |  | 684,223 | ​ | $ | 18.74 | ​ | 3.6 | ​ | $ | 13,616
Exercisable as of September 30, 2024 |  | 684,083 | ​ | $ | 18.74 | ​ | 3.6 | ​ | $ | 13,613
Summary of stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
Selling, general and administrative | $ | 7,317 | ​ | $ | 7,027 | ​ | $ | 24,804 | ​ | $ | 20,134
Total stock-based compensation expense | $ | 7,317 | ​ | $ | 7,027 | ​ | $ | 24,804 | ​ | $ | 20,134

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