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Equity Incentive Plan | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Equity Incentive Plan | Equity Incentive Plan Pursuant to the terms of the 2021 Plan, the Company may issue share-based awards to officers, employees, non-employee trustees and other eligible persons under the 2021 Plan. The 2021 Plan provides for a maximum of 6,828,527 common shares to be issued in the form of share options, share appreciation rights, restricted share awards, unrestricted share awards, share units, dividend equivalent rights, long-term incentive units, other equity-based awards and cash bonus awards. Share Awards From time to time, the Company may award unvested restricted shares under the 2021 Plan as compensation to officers, employees and non-employee trustees. The issued shares vest over a period of time as determined by the board of trustees at the date of grant. The Company recognizes compensation expense for time-based unvested restricted shares on a straight-line basis over the vesting period based upon the fair market value of the shares on the date of issuance, adjusted for forfeitures. Non-employee trustees may also elect to receive unrestricted shares under the 2021 Plan as compensation that would otherwise be paid in cash for their services. The shares issued to non-employee trustees in lieu of cash compensation are unrestricted and include no vesting conditions. The Company recognizes compensation expense for the unrestricted shares issued in lieu of cash compensation on the date of issuance based upon the fair market value of the shares on that date. A summary of the unvested restricted shares is as follows:
| 2024 |  | 2023 |  | 2022
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Unvested at January 1, | 2,305,303 |  |  | $ | 13.52 |  |  | 2,267,870 |  |  | $ | 15.32 |  |  | 2,380,283 |  |  | $ | 15.43 |
Granted | 925,731 |  |  | 11.57 |  |  | 991,453 |  |  | 10.84 |  |  | 569,600 |  |  | 15.10 |
Vested | (1,610,821) |  |  | 14.20 |  |  | (928,192) |  |  | 15.07 |  |  | (647,426) |  |  | 15.65 |
Forfeited | (30,924) |  |  | 11.00 |  |  | (25,828) |  |  | 13.13 |  |  | (34,587) |  |  | 13.15 |
Unvested at December 31, | 1,589,289 |  |  | $ | 11.74 |  |  | 2,305,303 |  |  | $ | 13.52 |  |  | 2,267,870 |  |  | $ | 15.32 |
For the years ended December 31, 2024, 2023 and 2022, the Company recognized approximately $11.7 million, $15.4 million and $14.4 million, respectively, of share-based compensation expense related to restricted share awards. As of December 31, 2024, there was $10.9 million of total unrecognized compensation costs related to unvested restricted share awards and these costs are expected to be recognized over a weighted-average period of 1.7 years. The total fair value of the shares vested (calculated as the number of shares multiplied by the vesting date share price) during the years ended December 31, 2024, 2023 and 2022 was approximately $17.8 million, $9.9 million and $9.0 million, respectively. Performance Units The Company aligns its executive officers with its long-term investors by awarding a significant percentage of their equity compensation in the form of multi-year performance unit awards that use both absolute and relative total shareholder return as the primary metrics. The performance units vest at the end of a three year period (the “performance units measurement period”). The performance units granted in 2024 may convert into restricted shares at a range of 0% to 200% of the number of performance units granted contingent upon the Company achieving a relative shareholder return over the measurement period at specified percentiles of the peer group, as defined by the awards. These performance units are subject to modification based on the Company's absolute total shareholder return performance as follows: (1) if at the end of the measurement period the relative total shareholder return performance exceeds target and absolute total shareholder return is less than zero, payouts will be reduced by 25%, but not below target and (2) if the absolute total shareholder return is down more than 15% during the entire measurement period, the maximum payout will be capped at 115% of target. The performance units granted prior to 2024 may convert into restricted shares at a range of 0% to 200% of the number of performance units granted contingent upon the Company achieving an absolute total shareholder return (25% of award) and a relative shareholder return (75% of award) over the measurement period at specified percentiles of the peer group, as defined by the awards. At the end of the performance units measurement period, if the target criterion is met, 100% of the performance units that are earned will vest immediately. The fair value of the performance units was determined using a Monte Carlo simulation. The Company estimates the compensation expense for the performance units on a straight-line basis using a calculation that recognizes 100% of the grant date fair value over three years. A summary of the performance unit awards is as follows:
Date of Award |  | Number of Units Granted |  | Grant Date Fair Value |  | Conversion Range |  | Risk Free Interest Rate |  | Volatility
February 2021 (1) |  | 431,151 |  | $20.90 |  | 0% to 200% |  | 0.23% |  | 69.47%
February 2022 |  | 407,024 |  | $21.96 |  | 0% to 200% |  | 1.70% |  | 70.15%
February 2023 |  | 574,846 |  | $16.90 |  | 0% to 200% |  | 4.33% |  | 66.70%
February 2024 |  | 703,325 |  | $15.13 |  | 0% to 200% |  | 4.43% |  | 35.60%
(1) In February 2024, following the end of the measurement period, the Company met certain threshold criterion and the performance units converted into approximately 253,000 restricted shares, all of which vested immediately. The total fair value of the vested shares related to the conversion of the performance units (calculated as the number of vested shares multiplied by the vesting date share price) during the year ended December 31, 2024 was approximately $3.0 million. For the years ended December 31, 2024, 2023 and 2022, the Company recognized approximately $9.1 million, $8.9 million and $7.3 million, respectively, of share-based compensation expense related to the performance unit awards. As of December 31, 2024, there was $11.6 million of total unrecognized compensation costs related to the performance unit awards and these costs are expected to be recognized over a weighted-average period of 1.7 years. As of December 31, 2024, there were 2,052,589 common shares available for future grant under the 2021 Plan, which includes potential common shares that may convert from performance units if certain target criterion is met.

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