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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Summary of Stock Option | The fair value of stock options is recorded as compensation expense on a straight-line basis over the vesting periods (which approximates the requisite service period) of the options and forfeitures are accounted for when they occur. Information related to all stock options under the 2021 Plan, 2017 Plan and 2007 Plan, and the 2020 Inducement Awards for 2023, 2022 and 2021 is shown in the tables below:
(Shares in thousands) |  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value ($000) |
Outstanding at December 31, 2022 |  |  | 1,440 |  |  | $ | 11.30 |  |  | 4.0 years |  |  |
Forfeitures |  |  | (92 | ) |  |  | 13.43 |  |  |  |  |  |
Exercised |  |  | (101 | ) |  |  | 11.93 |  |  |  |  |  |
Outstanding and expected to vest at December 31, 2023 |  |  | 1,247 |  |  |  | 11.09 |  |  | 3.4 years |  | $ | 11,452 |
Exercisable at December 31, 2023 |  |  | 942 |  |  |  | 11.10 |  |  | 3.4 years |  | $ | 8,652 |
(Shares in thousands) |  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value ($000) |
Outstanding at December 31, 2021 |  |  | 1,514 |  |  | $ | 11.19 |  |  | 4.9 years |  |  |
Forfeitures |  |  | (32 | ) |  |  | 10.55 |  |  |  |  |  |
Exercised |  |  | (42 | ) |  |  | 8.15 |  |  |  |  |  |
Outstanding and expected to vest at December 31, 2022 |  |  | 1,440 |  |  |  | 11.30 |  |  | 4.0 years |  | $ | 1,766 |
Exercisable at December 31, 2022 |  |  | 833 |  |  |  | 11.47 |  |  | 3.6 years |  | $ | 923 |
(Shares in thousands) |  | Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value ($000) |
Outstanding at December 31, 2020 |  |  | 1,554 |  |  | $ | 11.17 |  |  | 5.8 years |  |  |
Forfeitures |  |  | (38 | ) |  |  | 10.63 |  |  |  |  |  |
Exercised |  |  | (2 | ) |  |  | 6.66 |  |  |  |  |  |
Outstanding and expected to vest at December 31, 2021 |  |  | 1,514 |  |  |  | 11.19 |  |  | 4.9 years |  | $ | — |
Exercisable at December 31, 2021 |  |  | 603 |  |  |  | 11.39 |  |  | 4.0 years |  | $ | — |
Summary of Restricted Stock Awards | Information related to restricted stock awards under the 2021 Plan, 2017 Plan, 2007 Plan, and the 2020 Inducement Awards for 2023, 2022 and 2021 is shown in the table below. The fair value of restricted stock awards is based on the price of the stock in the open market on the date of the grant, and the fair value of performance-based restricted stock units is determined by using the Monte Carlo valuation model. The fair value of the restricted stock awards is recorded as compensation expense on a straight-line basis over the vesting periods of the awards and forfeitures are accounted for when they occur.
(Shares in thousands) |  | Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2020 |  |  | 1,047 |  |  | $ | 6.00 |
Granted |  |  | 573 |  |  |  | 8.19 |
Vested |  |  | (323 | ) |  |  | 6.31 |
Forfeited |  |  | (264 | ) |  |  | 5.80 |
Nonvested at December 31, 2021 |  |  | 1,033 |  |  |  | 7.17 |
Granted |  |  | 755 |  |  |  | 5.74 |
Vested |  |  | (355 | ) |  |  | 6.80 |
Forfeited |  |  | (255 | ) |  |  | 6.41 |
Nonvested at December 31, 2022 |  |  | 1,178 |  |  |  | 6.53 |
Granted |  |  | 734 |  |  |  | 16.12 |
Vested |  |  | (417 | ) |  |  | 6.56 |
Forfeited |  |  | (174 | ) |  |  | 7.19 |
Nonvested at December 31, 2023 |  |  | 1,321 |  |  | $ | 11.77 |

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