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Stock-Based Compensation and Other Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Stock-Based Compensation and Other Compensation Plans |
Schedule of RSU activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | RSUs |  | Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2023 | ​ | 1,606,303 | ​ | $ | 11.72
Granted | ​ | 1,517,153 | ​ | ​ | 12.29
Forfeited | ​ | (90,911) | ​ | ​ | 12.00
Vested (1) | ​ | (856,614) | ​ | ​ | 12.13
Outstanding at December 31, 2024 | ​ | 2,175,931 | ​ | $ | 11.94
​
(1) | Includes 60,078 of awards that vested but have not yet been issued. For these awards, the requisite service period was met during the three months ended September 30, 2024, and the awardees elected to defer issuance until retirement. Compensation expense for these shares was previously recognized over the requisite service period.
Schedule of PSU activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | PSUs |  | Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2023 | ​ | 404,993 | ​ | $ | 13.06
Granted | ​ | 281,527 | ​ | ​ | 29.38
Forfeited | ​ | (9,957) | ​ | ​ | 14.23
Vested (1) | ​ | (107,225) | ​ | ​ | 25.36
Outstanding at December 31, 2024 | ​ | 569,338 | ​ | $ | 18.79
​
(1) | On December 31, 2024, the performance period ended for these PSUs. Each PSU was converted into 1.57 shares representing 168,742 shares of Class A common stock that were issued in February 2025.
Schedule of assumptions to estimate the fair value of PSUs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2024 | ​ | 2023 |  | 2022
Risk-free Interest Rate | ​ | 4.67% | ​ | 4.32% | ​ | 1.44%
Volatility Range | ​ | 17.04% - 61.19% | ​ | 24.31% - 78.49% | ​ | 35.95% - 154.23%

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance 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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