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Share-Based Employee Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cost (reversal) of employee share-based compensation included in income, before income tax $ 1,297 $ (2,254) $ 6,667 $ 3,081  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, shares granted     0 0  
Compensation expense related to stock options 368 $ 343 $ 744 $ 722  
Total unrecognized compensation expense related to non-vested shares granted $ 845   $ 845    
Number of years compensation expense to be recognized over     8 months 12 days    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted 142,000 47,000 548,000 412,000  
Stock units, weighted average grant-date fair value $ 9.50 $ 8.66 $ 8.29 $ 8.23  
Compensation expense related to restricted stocks $ 841 $ 753 $ 1,761 $ 1,350  
Total unrecognized compensation expense related to non-vested shares granted $ 6,347   $ 6,347    
Number of years compensation expense to be recognized over     1 year 8 months 12 days    
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted 26,000 7,000 509,000 453,000  
Stock units, weighted average grant-date fair value $ 9.55 $ 10.34 $ 7.96 $ 8.20  
Total unrecognized compensation expense related to non-vested shares granted $ 6,545   $ 6,545    
Number of years compensation expense to be recognized over     2 years 1 month 24 days    
Award requisite service period     1 year    
Vesting period     3 years    
Cost (reversal) of employee share-based compensation included in income, before income tax 526 $ 279 $ 1,056 $ 467  
Performance Shares | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares awarded as a percentage of granted     50.00%    
Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares awarded as a percentage of granted     150.00%    
Phantom Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted     0 0  
Vesting period     3 years    
Cost (reversal) of employee share-based compensation included in income, before income tax 73 139 $ 390 $ 433  
Accrued compensation expense 235   $ 235   $ 1,898
Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted     0 0  
Vesting period     3 years    
Cost (reversal) of employee share-based compensation included in income, before income tax (511) $ (3,490) $ 2,716 $ 109  
Accrued compensation expense $ 2,898   $ 2,898   $ 3,990