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Share-Based Employee Compensation - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shareholder approved stock plans 2    
Cost (reversal) of employee share-based compensation included in income, before income tax $ 2,052 $ 5,370  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock options granted | shares 0 0  
Compensation expense related to stock options $ 121 $ 376  
Total unrecognized compensation expense related to non-vested shares granted $ 73    
Number of years compensation expense to be recognized over 2 years 2 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 $ 7,762    
Number of years compensation expense to be recognized over 1 year 10 months 17 days    
Number of stock units granted | shares 493,000 406,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 8.61 $ 7.87  
Compensation expense related to restricted stocks $ 1,040 $ 920  
Restricted Stock Units (RSUs) | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Restricted Stock Units (RSUs) | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
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 $ 8,120    
Number of years compensation expense to be recognized over 1 year 10 months 27 days    
Vesting period 3 years    
Number of stock units granted | shares 420,000 483,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 8.61 $ 7.87  
Cost (reversal) of employee share-based compensation included in income, before income tax $ 1,033 $ 530  
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 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%    
Phantom Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock units granted | shares 3,000 0  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 8.61    
Cost (reversal) of employee share-based compensation included in income, before income tax $ 1 $ 317  
Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Number of stock units granted | shares 0 0  
Cost (reversal) of employee share-based compensation included in income, before income tax $ 143 $ 3,227  
Accrued compensation expense $ 1,168   $ 1,460