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Share-Based Employee Compensation - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
plan
$ / shares
shares
Jun. 30, 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 $ 3,530 $ 3,464 $ 6,965 $ 6,464  
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 $ 22,385   $ 22,385    
Number of years compensation expense to be recognized over     2 years 7 months 6 days    
Number of stock units granted (in shares) | shares 53,000 59,000 452,000 419,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 16.73 $ 17.72 $ 15.35 $ 15.22  
Compensation expense related to restricted stocks $ 1,683 $ 1,463 $ 3,319 $ 2,850  
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 $ 25,793   $ 25,793    
Number of years compensation expense to be recognized over       1 year 9 months 18 days  
Number of stock units granted (in shares) | shares 0 0 265,000 307,000  
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 $ 1,847 $ 1,995 $ 3,646 $ 3,599  
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     149,000 0  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 16.96