XML 65 R51.htm IDEA: XBRL DOCUMENT v3.21.2
Equity Incentive Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Equity Incentive Plan            
Maximum number of common shares available for issuance (in shares) 6,828,527   6,828,527      
Restricted share awards            
Summary of non-vested shares/units            
Unvested at the beginning of the period (in shares)     1,252,228      
Granted (in shares)     1,733,358      
Vested (in shares)     (408,776)      
Forfeited (in shares)     (1,382)      
Unvested at the end of the period (in shares) 2,575,428   2,575,428      
Weighted Average Grant Date Fair Value            
Unvested at the beginning of the period (in dollars per share)     $ 15.17      
Granted (in dollars per share)     15.93      
Vested (in dollars per share)     15.46      
Forfeited (in dollars per share)     11.29      
Unvested at the end of the period (in dollars per share) $ 15.64   $ 15.64      
Other Disclosures            
Share-based compensation expense $ 3.0 $ 2.3 $ 4.9 $ 4.4    
Total unrecognized compensation costs $ 36.0   $ 36.0      
Weighted-average period of recognition of unrecognized share-based compensation expense     2 years 7 months 6 days      
Total fair value of shares vested     $ 6.3 2.8    
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      
Common shares available for future grant (in shares) 3,938,976   3,938,976      
2018 Performance Shares            
Summary of non-vested shares/units            
Granted (in shares)           264,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share           $ 13.99
Other Disclosures            
Fair value assumptions, risk free interest rate           2.42%
Fair value assumptions, expected volatility rate           27.44%
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 $ 1.8 $ 1.1 $ 2.7 $ 1.6    
Total unrecognized compensation costs $ 13.1   $ 13.1      
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      
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%