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Share-Based Employee Compensation - Additional Information (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
plan
$ / shares
shares
Jun. 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 $ 2,933 $ 3,530 $ 4,794 $ 6,965    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock units granted (in shares) | shares 134 53 402 452    
Total unrecognized compensation expense related to non-vested shares granted $ 12,349   $ 12,349      
Number of years compensation expense to be recognized over     2 years 1 month 6 days      
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 14.15 $ 16.73 $ 17.83 $ 15.35    
Compensation expense related to restricted stocks $ 1,362 $ 1,683 $ 2,977 $ 3,319    
Restricted Stock Units (RSUs) | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year      
Restricted Stock Units (RSUs) | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, 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     125 265    
Total unrecognized compensation expense related to non-vested shares granted 8,170   $ 8,170      
Number of years compensation expense to be recognized over       1 year 8 months 12 days    
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 19.66 $ 15.17    
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Shares, Percent           80.00%
Cost (reversal) of employee share-based compensation included in income, before income tax $ 1,572 $ 1,847 $ 1,817 $ 3,646    
Performance Shares | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Shares, Percent     50.00%   50.00%  
Shares awarded as a percentage of granted     0.00%      
Award requisite service period     1 year      
Performance Shares | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Shares, Percent     80.00%      
Shares awarded as a percentage of granted     200.00%      
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     125 149    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years      
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 23.22 $ 16.96