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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, 2019
USD ($)
plan
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
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 $ 3,435 $ 2,999  
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 $ 13,292    
Number of years compensation expense to be recognized over 2 years 9 months 14 days    
Number of stock units granted (in shares) | shares 400 360  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 15.17 $ 14.80  
Compensation expense related to restricted stocks $ 1,799 $ 1,387  
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 $ 13,677    
Number of years compensation expense to be recognized over   2 years 19 days  
Number of stock units granted (in shares) | shares 226 307  
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 $ 1,636 $ 1,604  
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%
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 0  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 16.96