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Share-Based Employee Compensation - Additional Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cost of employee share-based compensation included in income, before income tax $ (491) $ 1,888 $ 2,590 $ 4,257  
Accrued employee compensation and benefits 29,212   29,212   31,585
Long-term incentive compensation and other 2,020   2,020   5,555
Stock Options
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, shares granted   0 0 1,843,000  
Stock options granted during period, weighted average grant-date fair value       $ 2.47  
Compensation expense related to stock options 358 486 1,081 1,333  
Restricted Stock Units (RSUs)
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted 13,000 0 384,000 441,000  
Stock units, weighted average grant-date fair value $ 7.61   $ 8.18 $ 6.55  
Compensation expense related to restricted stocks 770 436 2,121 1,258  
Total unrecognized compensation expense related to non-vested shares granted 4,770   4,770    
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     453,000    
Stock units, weighted average grant-date fair value     $ 8.20    
Award requisite service period 1 year        
Vesting period     3 years    
Cost of employee share-based compensation included in income, before income tax 310   777    
Phantom Stock Units
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units granted     0 0  
Vesting period     3 years    
Cost of employee share-based compensation included in income, before income tax 57 430 374 947  
Accrued compensation expense 1,624   1,624   2,830
Accrued employee compensation and benefits         1,439
Long-term incentive compensation and other         1,391
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 of employee share-based compensation included in income, before income tax (1,872) 536 (1,763) 719  
Accrued compensation expense 3,379   3,379   5,193
Accrued employee compensation and benefits         4,200
Long-term incentive compensation and other         $ 993
Minimum | Performance Shares
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares awarded as a percentage of granted 50.00%        
Maximum | Performance Shares
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares awarded as a percentage of granted 150.00%