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Stock-based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Stock Option Activity | Stock option activity from January 1, 2023 to June 30, 2023 follows:
|  |  |  | Weighted |
|  |  |  | Average |
| Underlying |  |  | Exercise Price |
| Shares |  |  | Per Share |
Outstanding at January 1, 2023 |  | 2,905,150 |  |  | $ | 22.19 |
Exercised |  | — |  |  | $ | — |
Expired |  | (662,500 | ) |  | $ | 22.70 |
Outstanding at June 30, 2023 |  | 2,242,650 |  |  | $ | 22.04 |
Exercisable at June 30, 2023 |  | 2,242,650 |  |  | $ | 22.04 |
Restricted Stock Unit Activity | Restricted stock unit activity from January 1, 2023 to June 30, 2023 follows:
|  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  | Average Grant |
| Time |  |  | Performance |  |  | Date Fair Value |
| Based |  |  | Based |  |  | Per Share |
Non-vested restricted stock units outstanding at January 1, 2023 |  | 3,090,846 |  |  |  | 359,315 |  |  | $ | 12.71 |
Granted |  | 1,675,657 |  |  |  | — |  |  | $ | 11.32 |
Vested |  | (1,600,786 | ) |  |  | — |  |  | $ | 9.89 |
Forfeited |  | (13,002 | ) |  |  | — |  |  | $ | 15.45 |
Non-vested restricted stock units outstanding at June 30, 2023 |  | 3,152,715 |  |  |  | 359,315 |  |  | $ | 12.93 |
Performance Units | The total target number of shares with respect to the Performance Units for the awards granted in 2019-2023 is set forth below:
| 2023 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2019 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Target number of shares |  | 631,700 |  |  |  | 414,000 |  |  |  | 843,000 |  |  |  | 500,500 |  |  |  | 489,800 |
Fair Value of Performance Units | The fair value of the Performance Units is set forth below (in thousands):
| 2023 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2019 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Aggregate fair value at date of grant | $ | 8,440 |  |  | $ | 10,743 |  |  | $ | 7,225 |  |  | $ | 826 |  |  | $ | 9,958 |
Compensation Expense Associated with Performance Units | Compensation expense associated with the Performance Units is shown below (in thousands):
| 2023 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2019 |
| Performance |  |  | Performance |  |  | Performance |  |  | Performance |  |  | Performance |
| Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |  |  | Unit Awards |
Three months ended June 30, 2023 | $ | 469 |  |  | $ | 895 |  |  | $ | 602 |  |  | N/A |  |  | N/A |
Three months ended June 30, 2022 | N/A |  |  | $ | 895 |  |  | $ | 602 |  |  | $ | 69 |  |  | N/A |
Six months ended June 30, 2023 | $ | 469 |  |  | $ | 1,791 |  |  | $ | 1,204 |  |  | $ | 69 |  |  | N/A |
Six months ended June 30, 2022 | N/A |  |  | $ | 895 |  |  | $ | 1,204 |  |  | $ | 138 |  |  | $ | 830 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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