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Equity Incentive Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Equity Incentive Plan        
Maximum number of common shares available for issuance (in shares) 6,828,527      
Restricted share awards        
Summary of non-vested shares/units        
Unvested at the beginning of the period (in shares) 2,380,283      
Granted (in shares) 432,779      
Vested (in shares) (234,897)      
Forfeited (in shares) (4,629)      
Unvested at the end of the period (in shares) 2,573,536      
Weighted Average Grant Date Fair Value        
Unvested at the beginning of the period (in dollars per share) $ 15.43      
Granted (in dollars per share) 15.22      
Vested (in dollars per share) 15.63      
Forfeited (in dollars per share) 13.34      
Unvested at the end of the period (in dollars per share) $ 15.38      
Other Disclosures        
Share-based compensation expense $ 3.5 $ 1.9    
Total unrecognized compensation costs $ 29.8      
Weighted-average period of recognition of unrecognized share-based compensation expense 2 years 2 months 12 days      
Total fair value of shares vested $ 3.4 3.7    
2015 Share Repurchase Program [Member]        
Other Disclosures        
Performance-based vesting period 3 years      
Time-based vesting period 1 year      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 4 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Absolute Total Shareholder Return 40.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Relative Total Shareholder Return 60.00%      
Vesting percentage upon satisfaction of performance-based vesting period 50.00%      
Vesting percentage upon satisfaction of time-based vesting period 50.00%      
Percentage of grant date fair value to be recognized over three years 50.00%      
Employee service share based compensation cost period of recognition 3 years      
Percentage of grant date fair value to be recognized over four years 50.00%      
Employee service share based compensation cost period of recognition 4 years      
2019 Performance Shares [Member]        
Summary of non-vested shares/units        
Granted (in shares)     260,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share     $ 19.16  
Other Disclosures        
Fair value assumptions, risk free interest rate     2.52%  
Fair value assumptions, expected volatility rate     27.19%  
Performance Units        
Other Disclosures        
Share-based compensation expense $ 1.7 $ 0.9    
Total unrecognized compensation costs $ 16.5      
Weighted-average period of recognition of unrecognized share-based compensation expense 2 years 3 months 18 days      
2020 Performance Shares [Member]        
Summary of non-vested shares/units        
Granted (in shares)   489,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share   $ 11.59    
Other Disclosures        
Fair value assumptions, risk free interest rate   1.08%    
Fair value assumptions, expected volatility rate   23.46%    
2021 Performance Shares        
Summary of non-vested shares/units        
Granted (in shares) 431,151      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share $ 20.90      
Other Disclosures        
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Absolute Total Shareholder Return 2500.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Relative Total Shareholder Return 75.00%      
Fair value assumptions, risk free interest rate 0.23%      
Fair value assumptions, expected volatility rate 69.47%      
Percentage of grant date fair value to be recognized over three years 100.00%      
Employee service share based compensation cost period of recognition 3 years      
2022 Performance Shares        
Summary of non-vested shares/units        
Granted (in shares)   407,024    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share $ 21.96      
Other Disclosures        
Fair value assumptions, risk free interest rate 1.70%      
Fair value assumptions, expected volatility rate 70.15%      
2021 Share Repurchase Program        
Other Disclosures        
Common shares available for future grant (in shares) 3,493,984      
Minimum | 2017 Performance Shares [Member]        
Equity Incentive Plan        
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range       0.00%
Minimum | 2015 Share Repurchase Program [Member]        
Other Disclosures        
Percentage of performance units that will convert into restricted shares 0.00%      
Minimum | 2018 Performance Shares        
Equity Incentive Plan        
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range     0.00%  
Minimum | 2019 Performance Shares [Member]        
Equity Incentive Plan        
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range   0.00%    
Minimum | 2020 Performance Shares [Member]        
Equity Incentive Plan        
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range 0.00%      
Maximum | 2017 Performance Shares [Member]        
Equity Incentive Plan        
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range       150.00%
Maximum | Restricted share awards        
Other Disclosures        
Vesting period 4 years      
Maximum | 2015 Share Repurchase Program [Member]        
Other Disclosures        
Percentage of performance units that will convert into restricted shares 200.00%      
Maximum | 2018 Performance Shares        
Equity Incentive Plan        
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range     150.00%  
Maximum | 2019 Performance Shares [Member]        
Equity Incentive Plan        
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range   200.00%    
Maximum | 2020 Performance Shares [Member]        
Equity Incentive Plan        
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range 200.00%