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Share-Based Employee Compensation - Additional Information (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
plan
$ / shares
shares
Mar. 31, 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 $ 1,861 $ 3,435    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock units granted (in shares) | shares 268 400    
Total unrecognized compensation expense related to non-vested shares granted $ 12,132      
Number of years compensation expense to be recognized over 2 years 2 months 12 days      
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 19.67 $ 15.17    
Compensation expense related to restricted stocks $ 1,615 $ 1,799    
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 125 226    
Total unrecognized compensation expense related to non-vested shares granted $ 7,732      
Number of years compensation expense to be recognized over   2 years    
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 $ 245 $ 1,636    
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