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Equity Incentive Plan - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares)   6,828,527      
Common shares available for future grant (in shares)   2,688,397      
Restricted share awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted shares   2,305,303 2,267,870 2,380,283 1,252,228
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 13.52 $ 15.32 $ 15.43 $ 15.17
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   991,453 569,600 1,739,327  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 10.84 $ 15.10 $ 15.92  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period   (928,192) (647,426) (513,342)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 15.07 $ 15.65 $ 16.51  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (25,828) (34,587) (97,930)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value   $ 13.13 $ 13.15 $ 15.22  
Share grants to trustees   $ 15.4 $ 14.4 $ 11.9  
Total unrecognized compensation costs   $ 13.4      
Weighted-average period of recognition of unrecognized share-based compensation expense   1 year 4 months 24 days      
Total fair value of shares vested   $ 9.9 $ 9.0 $ 7.8  
2015 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years      
Share Based Compensation Arrangement by Share Based Payment Award, Performance Based Vesting Period   3 years      
Share Based Compensation Arrangement by Share Based Payment Award, Time Based Vesting Period   1 year      
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Percentage Of Grant Date Fair Value Recognized Over Three Years   50.00%      
Employee Service Share Based Compensation Nonvested Awards For First Fifty Percent Compensation Cost Not Yet Recognized Period For Recognition   3 years      
Employee Service Share Based Compensation Nonvested Awards For Remaining Fifty Percent Compensation Cost Not Yet Recognized Period For Recognition   50.00%      
Employee Service Share Based Compensation Nonvested Awards For Remaining Fifty Percent Cost Not Yet Recognized, Period For Recognition   4 years      
2021 Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       431,151  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 20.90  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       0.23%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       69.47%  
Share Based Compensation Arrangement by Share Based Payment Award, Performance Based Vesting Period   3 years      
2021 Performance Shares | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period       0  
2021 Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period       200  
2021 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Percentage Of Grant Date Fair Value Recognized Over Three Years   100.00%      
Employee Service Share Based Compensation Nonvested Awards For First Fifty Percent Compensation Cost Not Yet Recognized Period For Recognition   3 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Absolute Total Shareholder Return   25.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Relative Total Shareholder Return   75.00%      
Share-based compensation arrangement, by share based payment award, vesting rights percentage immediately   100.00%      
2021 Equity Incentive Plan | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period   0.00%      
2021 Equity Incentive Plan | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period   200.00%      
2020 Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted shares   100,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 200,000       489,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 11.59
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate         1.08%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate         23.46%
Total fair value of shares vested   $ 1.1      
2020 Performance Shares | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period         0
2020 Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period         200
2022 Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     407,024    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 21.96    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     1.70%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     70.15%    
2022 Performance Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period     0    
2022 Performance Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period     200    
2023 Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   574,846      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 16.90      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   4.33%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   66.70%      
2023 Performance Shares | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range   0.00%      
2023 Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range   200.00%      
Performance units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share grants to trustees   $ 8.9 $ 7.3 $ 5.2  
Total unrecognized compensation costs   $ 10.7      
Weighted-average period of recognition of unrecognized share-based compensation expense   1 year 8 months 12 days