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Stock-Based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Stock-based payment awards |
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2024 |  | 2023 |  | 2022
Equity award expense | ​ | $ | 14,646 | ​ | $ | 12,998 | ​ | $ | 11,928
Liability award expense | ​ |  | 18,393 | ​ |  | 7,910 | ​ |  | 2,569
Total stock-based compensation expense | ​ | $ | 33,039 | ​ | $ | 20,908 | ​ | $ | 14,497
Schedule of valuation assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ | ​ | 2024 | ​ | 2023 | ​ | 2022 | ​
Remaining performance period as of grant date (in years) |  | ​ | 2.9 |  | ​ | 2.9 |  | ​ | 2.9 |
Risk-free interest rate used |  | ​ | 4.1 | % | ​ | 3.9 | % | ​ | 1.4 | %
Grant-date fair value | ​ | $ | 23.67 | ​ | $ | 15.68 | ​ | $ | 11.96 | ​
Restricted stock and performance-based restricted stock units |
Stock-based payment awards |
Schedule of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
(in thousands, except per share amounts) |  | Shares |  | Per Share
Non-vested restricted stock and performance-based restricted stock units, December 31, 2023 |  | 2,625 | ​ | $ | 10.19
Granted |  | 864 | ​ |  | 17.44
Adjustment for performance | ​ | 13 | ​ | ​ | 14.30
Vested |  | (1,188) | ​ |  | 10.22
Canceled |  | (38) | ​ |  | 12.08
Non-vested restricted stock and performance-based restricted stock units, December 31, 2024 |  | 2,276 | ​ | $ | 12.81
Cash-settled performance units |
Stock-based payment awards |
Schedule of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
(in thousands, except per share amounts) |  | Shares |  | Per Share
Non-vested cash-settled performance units, December 31, 2023 |  | 548 | ​ | $ | 9.37
Granted |  | 134 | ​ |  | 16.00
Adjustment for performance | ​ | 92 | ​ | ​ | 10.70
Vested |  | (235) | ​ |  | 10.70
Canceled |  | — | ​ |  | —
Non-vested cash-settled performance units, December 31, 2024 |  | 539 | ​ | $ | 10.67

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