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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, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2019
USD ($)
plan
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
Dec. 31, 2017
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 $ 2,513 $ 3,512 $ 9,478 $ 9,975    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total unrecognized compensation expense related to non-vested shares granted $ 19,007   $ 19,007      
Number of years compensation expense to be recognized over     1 year 10 months 24 days      
Number of stock units granted (in shares) | shares 0   452,000 420,000    
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 15.35 $ 15.22    
Compensation expense related to restricted stocks $ 1,176 $ 1,536 $ 4,495 $ 4,386    
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]            
Total unrecognized compensation expense related to non-vested shares granted $ 22,985   $ 22,985      
Number of years compensation expense to be recognized over       1 year 6 months    
Number of stock units granted (in shares) | shares 0 0 226,000 307,000    
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 15.17 $ 14.80    
Award requisite service period         3 years  
Cost (reversal) of employee share-based compensation included in income, before income tax $ 1,337 $ 1,975 $ 4,983 $ 5,575    
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      
Award requisite service period     1 year      
Shares awarded as a percentage of granted     0.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Shares, Percent     50.00%   50.00% 80.00%
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      
Award requisite service period     5 years      
Shares awarded as a percentage of granted     200.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Shares, Percent     80.00%   80.00%  
Performance Share Units with Total Shareholder Return Conditions [Member]            
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      
Number of stock units granted (in shares) | shares     149,000 0    
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 16.96