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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, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
plan
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
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 $ 2,185 $ 2,483 $ 5,370 $ 4,535  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock options granted (in shares) | shares   0 0  
Compensation expense related to stock options 9 $ 8 $ 17 $ 129  
Total unrecognized compensation expense related to non-vested shares granted 31   $ 31    
Number of years compensation expense to be recognized over     11 months 5 days    
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 $ 9,395   $ 9,395    
Number of years compensation expense to be recognized over     2 years 6 months 22 days    
Number of stock units granted (in shares) | shares 60,000 43,000 526,000 539,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 12.04 $ 9.22 $ 10.35 $ 8.66  
Compensation expense related to restricted stocks $ 1,439 $ 1,062 $ 2,660 $ 2,102  
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 $ 8,411   $ 8,411    
Number of years compensation expense to be recognized over     1 year 6 months    
Number of stock units granted (in shares) | shares 0 0 370,000 420,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 10.10 $ 8.61  
Award requisite service period     3 years 3 years  
Cost (reversal) of employee share-based compensation included in income, before income tax $ 737 $ 1,064 $ 2,725 $ 2,097  
Performance Shares | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
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% 50.00%
Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award requisite service period     3 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%  
Stock Appreciation Rights (SARs)          
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   0 0  
Cost (reversal) of employee share-based compensation included in income, before income tax (32) $ (350) $ 0 $ 207  
Accrued compensation expense $ 0   $ 0   $ 224