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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Stock Option Activity | Stock option activity from January 1, 2024 to September 30, 2024 follows:
| Underlying Shares |  | Weighted Average Exercise Price Per Share
Outstanding at January 1, 2024 | 2,865,223 |  | $ | 23.36 |
Exercised | — |  | $ | — |
Expired | (1,031,218) |  | $ | 25.52 |
Outstanding at September 30, 2024 | 1,834,005 |  | $ | 22.14 |
Exercisable at September 30, 2024 | 1,834,005 |  | $ | 22.14 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2024 to September 30, 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 | 3,101,421 |  | — |  | $ | 10.50 |
Vested | (3,220,826) |  | (27,640) |  | $ | 9.09 |
Forfeited | (189,134) |  | — |  | $ | 11.46 |
Non-vested restricted stock units outstanding at September 30, 2024 | 5,519,129 |  | 493,893 |  | $ | 11.34 |
Performance Units | The total target number of shares granted with respect to the Performance Units for the awards granted in 2020-2024 is set forth below:
| 2024 Performance Unit Awards |  | 2023 Performance Unit Awards |  | 2022 Performance Unit Awards |  | 2021 Performance Unit Awards |  | 2020 Performance Unit Awards
Target number of shares | 875,100 |  | 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):
| 2024 Performance Unit Awards |  | 2023 Performance Unit Awards |  | 2022 Performance Unit Awards |  | 2021 Performance Unit Awards |  | 2020 Performance Unit Awards
Aggregate fair value at date of grant | $ | 10,904 |  |  | $ | 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):
| 2024 Performance Unit Awards |  | 2023 Performance Unit Awards |  | 2022 Performance Unit Awards |  | 2021 Performance Unit Awards |  | 2020 Performance Unit Awards
Three months ended September 30, 2024 | $ | 912 |  |  | $ | 670 |  |  | $ | 866 |  |  | N/A |  | N/A
Three months ended September 30, 2023 | N/A |  | $ | 903 |  |  | $ | 990 |  |  | $ | 617 |  |  | N/A
Nine months ended September 30, 2024 | $ | 1,518 |  |  | $ | 1,997 |  |  | $ | 2,590 |  |  | $ | 584 |  |  | N/A
Nine months ended September 30, 2023 | N/A |  | $ | 1,372 |  |  | $ | 2,781 |  |  | $ | 1,821 |  |  | $ | 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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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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