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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Stock Option Activity | Stock option activity from January 1, 2024 to March 31, 2024 follows:
| Underlying Shares |  | Weighted Average Exercise Price Per Share
Outstanding at January 1, 2024 | 2,865,223 |  | $ | 23.36 |
Exercised | — |  | $ | — |
Expired | (192,099) |  | $ | 20.78 |
Outstanding at March 31, 2024 | 2,673,124 |  | $ | 23.54 |
Exercisable at March 31, 2024 | 2,673,124 |  | $ | 23.54 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2024 to March 31, 2024 follows:
| Time Based |  | Performance Based |  | Weighted Average Grant Date Fair Value Per Share
Non-vested restricted stock units outstanding at January 1, 2024 | 5,827,668 |  | 521,533 |  | $ | 10.60 |
Granted | 168,512 |  | — |  | $ | 10.80 |
Vested | (1,363,284) |  | — |  | $ | 5.53 |
Forfeited | (32,196) |  | — |  | $ | 12.83 |
Non-vested restricted stock units outstanding at March 31, 2024 | 4,600,700 |  | 521,533 |  | $ | 11.95 |
Performance Units | The total target number of shares granted with respect to the Performance Units for the awards granted in 2020-2023 is set forth below:
| 2023 Performance Unit Awards |  | 2022 Performance Unit Awards |  | 2021 Performance Unit Awards |  | 2020 Performance Unit Awards
Target number of shares | 631,700 |  | 414,000 |  | 843,000 |  | 500,500
Fair Value of Performance Units | The fair value of the Performance Units is set forth below (in thousands):
| 2023 Performance Unit Awards |  | 2022 Performance Unit Awards |  | 2021 Performance Unit Awards |  | 2020 Performance Unit Awards
Aggregate fair value at date of grant | $ | 8,440 |  |  | $ | 10,743 |  |  | $ | 7,225 |  |  | $ | 826 |
Compensation Expense Associated with Performance Units | Compensation expense associated with the Performance Units is shown below (in thousands):
| 2023 Performance Unit Awards |  | 2022 Performance Unit Awards |  | 2021 Performance Unit Awards |  | 2020 Performance Unit Awards |  |
Three months ended March 31, 2024 | $ | 663 |  |  | $ | 862 |  |  | $ | 584 |  |  | NA |  |
Three months ended March 31, 2023 | NA |  | $ | 895 |  |  | $ | 602 |  |  | $ | 69 |  |  |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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