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Share-Based Employee Compensation - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2020
USD ($)
plan
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shareholder approved stock plans | plan     2      
Cost (reversal) of employee share-based compensation included in income, before income tax $ 3,272 $ 2,513 $ 8,066 $ 9,478    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock units granted (in shares) | shares 0 0 406,000 452,000    
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 17.82 $ 15.35    
Compensation expense related to restricted stocks $ 1,907 $ 1,176 $ 4,884 $ 4,495    
Total unrecognized compensation expense related to non-vested shares granted $ 8,993   $ 8,993      
Number of years compensation expense to be recognized over     1 year 9 months 18 days      
Restricted Stock Units (RSUs) | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     1 year      
Restricted Stock Units (RSUs) | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     3 years      
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock units granted (in shares) | shares 0 0 125,000 226,000    
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 19.66 $ 15.17    
Total unrecognized compensation expense related to non-vested shares granted $ 5,519   $ 5,519      
Number of years compensation expense to be recognized over       1 year 4 months 24 days    
Target award shares, percent           80.00%
Cost (reversal) of employee share-based compensation included in income, before income tax $ 1,365 $ 1,337 $ 3,182 $ 4,983    
Performance Shares | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares awarded as a percentage of granted     0.00%      
Target award shares, percent     50.00%   50.00%  
Award vesting period     3 years      
Award requisite service period     1 year      
Performance Shares | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares awarded as a percentage of granted     200.00%      
Target award shares, percent     80.00%      
Award vesting period     5 years      
Award requisite service period     5 years      
Performance Share Units with Total Shareholder Return Conditions            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock units granted (in shares) | shares 0 0 125,000 149,000    
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 23.22 $ 16.96    
Award vesting period     3 years