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Share-Based Compensation Plan | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Share-Based Compensation Plan | Share-Based Compensation Plan Available Shares The Company maintains the 2009 Equity Incentive Plan, as amended and restated (as amended, the "Plan"), to attract and retain independent trustees, executive officers and other key employees and service providers. The Plan provides for the grant of options to purchase common shares, share awards, share appreciation rights, performance units and other equity-based awards. Share awards under the Plan vest over a period determined by the Board of Trustees, generally over three to five years. The Company pays or accrues for dividends on share-based awards. All outstanding share awards are subject to full or partial accelerated vesting upon a change in control and upon death or disability or certain other employment termination events as set forth in the award agreements. As of December 31, 2024, there were 1,177,236 common shares available for issuance under the Plan. Service Condition Share Awards From time to time, the Company awards restricted common shares under the Plan to members of the Board of Trustees, officers and employees. These shares generally vest over three to five years based on continued service or employment. The following table provides a summary of service condition restricted share activity for the years ended December 31, 2024, 2023 and 2022:
| Shares |  | Weighted-Average Grant Date Fair Value
Unvested at January 1, 2022 | 567,431 |  |  | $ | 22.53 |
Granted | 143,795 |  |  | $ | 21.72 |
Vested | (107,303) |  |  | $ | 26.23 |
Forfeited | (36,606) |  |  | $ | 22.80 |
Unvested at December 31, 2022 | 567,317 |  |  | $ | 21.60 |
Granted | 113,084 |  |  | $ | 15.04 |
Vested | (183,721) |  |  | $ | 23.14 |
Forfeited | (53,131) |  |  | $ | 16.72 |
Unvested at December 31, 2023 | 443,549 |  |  | $ | 19.88 |
Granted | 139,134 |  |  | $ | 16.11 |
Vested | (171,508) |  |  | $ | 21.20 |
Forfeited | (3,127) |  |  | $ | 15.69 |
Unvested at December 31, 2024 | 408,048 |  |  | $ | 18.07 |
The fair value of each of these service condition restricted share awards is determined based on the closing price of the Company’s common shares on the grant date and compensation expense is recognized on a straight-line basis over the vesting period. For the years ended December 31, 2024, 2023 and 2022, the Company recognized approximately $3.4 million, $3.5 million and $3.8 million, respectively, of share-based compensation expense related to these awards in the accompanying consolidated statements of operations and comprehensive income. As of December 31, 2024, there was $3.3 million of total unrecognized share-based compensation expense related to unvested restricted shares. The unrecognized share-based compensation expense is expected to be recognized over the weighted-average remaining vesting period of 1.5 years. Performance-Based Equity Awards On February 13, 2019, the Board of Trustees approved a target award of 126,891 performance-based equity awards to officers and employees of the Company. In January 2022, none of these awards vested and the Company issued no common shares to officers or employees. The actual number of common shares that vested was based on the performance criteria defined in the award agreements for the period of performance from January 1, 2019 through December 31, 2021. On February 12, 2020, the Board of Trustees approved a target award of 161,777 performance-based equity awards to officers and employees of the Company. In January 2023, following the completion of the performance period from January 1, 2020 through December 31, 2022, the Company issued 51,686 common shares in settlement of the awards, based on the performance criteria defined in the award agreements. On February 18, 2021, the Board of Trustees approved a target award of 189,348 performance-based equity awards to officers and employees of the Company. In January 2024, following the completion of the performance period from January 1, 2021 through December 31, 2023, the Company issued 71,677 common shares in settlement of the awards, based on the performance criteria defined in the award agreements. On May 16, 2022, the Board of Trustees approved a target award of 175,898 performance-based equity awards to officers and employees of the Company. These awards will vest, if at all, in 2025. The actual number of common shares that ultimately vest will be from 0% to 200% of the target award and will be determined in 2025 based on the performance criteria defined in the award agreements for the period of performance from January 1, 2022 through December 31, 2024. On February 17, 2023, the Board of Trustees approved a target award of 314,235 performance-based equity awards to officers and employees of the Company. These awards will vest, if at all, in 2026. The actual number of common shares that ultimately vest will be from 0% to 200% of the target award and will be determined in 2026 based on the performance criteria defined in the award agreements for the period of performance from January 1, 2023 through December 31, 2025. On February 15, 2024, the Board of Trustees approved a target award of 322,950 performance-based equity awards to officers and employees of the Company. These awards will vest, if at all, in 2027. The actual number of common shares that ultimately vest will be from 0% to 200% of the target award and will be determined in 2027 based on the performance criteria defined in the award agreements for the period of performance from January 1, 2024 through December 31, 2026. The grant date fair value of the performance awards, with market conditions, were determined using a Monte Carlo simulation method with the following assumptions (dollars in millions):
Performance Award Grant Date |  | Percentage of Total Award |  | Grant Date Fair Value by Component |  | Volatility |  | Interest Rate |  | Dividend Yield
February 13, 2019 |  |  |  |  |  |  |  |  |  |
| Relative and Absolute Total Shareholder Return |  | 65.00% / 35.00% |  | $4.5 |  | 26.00% |  | 2.52% |  | 4.20%
February 12, 2020 |  |  |  |  |  |  |  |  |  |
| Relative Total Shareholder Return |  | 100.00% |  | $4.9 |  | 23.40% |  | 1.41% |  | —%
February 18, 2021 |  |  |  |  |  |  |  |  |  |
| Relative Total Shareholder Return |  | 100.00% |  | $6.0 |  | 56.00% |  | 0.19% |  | —%
May 16, 2022 |  |  |  |  |  |  |  |  |
| Relative Total Shareholder Return |  | 100.00% |  | $5.3 |  | 58.70% |  | 2.72% |  | —%
February 17, 2023 |  |  |  |  |  |  |  |  |
| Relative and Absolute Total Shareholder Return |  | 70.00% / 30.00% |  | $6.0 |  | 61.60% |  | 4.31% |  | —%
February 15, 2024 |  |  |  |  |  |  |  |  |
| Relative and Absolute Total Shareholder Return |  | 70.00% / 30.00% |  | $6.6 |  | 38.50% |  | 4.38% |  | —%
In the table above, the Relative Total Shareholder Return and Absolute Total Shareholder Return components are market conditions as defined by ASC 718. Dividends on unvested performance-based equity awards accrue over the vesting period and will be paid on the actual number of shares that vest at the end of the applicable period. The Company recognizes compensation expense on a straight-line basis through the vesting date. For the years ended December 31, 2024, 2023 and 2022, the Company recognized approximately $6.0 million, $5.6 million and $4.8 million, respectively, of share-based compensation expense related to performance-based equity awards in the accompanying consolidated statements of operations and comprehensive income. As of December 31, 2024, there was approximately $6.6 million of unrecognized compensation expense related to these performance-based equity awards which will be recognized over the weighted-average remaining vesting period of 1.7 years. Long-Term Incentive Partnership Units LTIP units, which are also referred to as profits interest units, may be issued to eligible participants for the performance of services to or for the benefit of the Operating Partnership. LTIP units are a class of partnership unit in the Operating Partnership and receive, whether vested or not, the same per-unit profit distributions as the other outstanding units in the Operating Partnership, which equal per-share distributions on common shares. LTIP units are allocated their pro-rata share of the Company's net income (loss). Vested LTIP units may be converted by the holder, at any time, into an equal number of common Operating Partnership units and thereafter will possess all of the rights and interests of a common Operating Partnership unit, including the right to redeem the common Operating Partnership unit for a common share in the Company or cash, at the option of the Operating Partnership. As of December 31, 2024, the Operating Partnership had two classes of LTIP units, LTIP Class A units and LTIP Class B units. All of the outstanding LTIP units are held by officers of the Company. On February 18, 2021, the Board of Trustees granted 600,097 LTIP Class B units to executive officers of the Company. These LTIP units will vest ratably on January 1, 2023, 2024, 2025 and 2026, contingent upon continued employment with the Company. The fair value of each award was determined based on the closing price of the Company’s common shares on the grant date of $22.69 per unit with an aggregate grant date fair value of $13.6 million. On February 17, 2023, the Board of Trustees granted 131,276 LTIP Class B units to executive officers of the Company. These LTIP units will vest ratably on January 1, 2024, 2025 and 2026, contingent upon continued employment with the Company. The fair value of each award was determined based on the closing price of the Company’s common shares on the grant date of $15.04 per unit with an aggregate grant date fair value of $2.0 million. On February 15, 2024, the Board of Trustees granted 136,353 LTIP Class B units to executive officers. These LTIP units will vest ratably on January 1, 2025, 2026 and 2027, contingent upon continued employment with the Company. The fair value of each award was determined based on the closing price of the Company’s common shares on the grant date of $16.13 per unit with an aggregate grant date fair value of $2.2 million. As of December 31, 2024, the Operating Partnership had 994,837 LTIP units outstanding, of which 470,920 LTIP units have vested. As of December 31, 2023, the Operating Partnership had 858,484 LTIP units outstanding, of which 277,136 LTIP units have vested. Only vested LTIP units may be converted to OP units, which in turn can be tendered for redemption as described in Note 7. Equity. For the years ended December 31, 2024, 2023 and 2022, the Company recognized approximately $4.2 million, $3.4 million and $2.8 million, respectively, in expense related to these LTIP units. As of December 31, 2024, there was $5.0 million of unrecognized share-based compensation expense related to LTIP units. The aggregate expense related to the LTIP unit grants is presented as non-controlling interest in the Company’s accompanying consolidated balance sheets.

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