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Share-Based Employee Compensation - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
plan
$ / shares
shares
Sep. 30, 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 | plan     2    
Cost (reversal) of employee share-based compensation included in income, before income tax $ 2,265,000 $ 1,470,000 $ 6,800,000 $ 8,137,000  
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 8,000 $ 320,000 $ 137,000 $ 1,064,000  
Total unrecognized compensation expense related to non-vested shares granted 56,000   $ 56,000    
Number of years compensation expense to be recognized over     1 year 8 months 1 day    
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 $ 7,466,000   $ 7,466,000    
Number of years compensation expense to be recognized over     2 years 1 month 9 days    
Number of stock units granted | shares 126,000 8,000 665,000 556,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 11.49 $ 9.10 $ 9.20 $ 8.30  
Compensation expense related to restricted stocks $ 1,055,000 $ 865,000 $ 3,157,000 $ 2,626,000  
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 $ 5,938,000   $ 5,938,000    
Number of years compensation expense to be recognized over     1 year 4 months 13 days    
Vesting period     3 years    
Number of stock units granted | shares 0 0 420,000 509,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares     $ 8.61 $ 7.96  
Cost (reversal) of employee share-based compensation included in income, before income tax $ 1,073,000 $ 790,000 $ 3,170,000 $ 1,846,000  
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%    
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 0 0   0  
Cost (reversal) of employee share-based compensation included in income, before income tax $ 0 $ 0 $ 0 $ 390,000  
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 129,000 $ (505,000) $ 336,000 $ 2,211,000  
Accrued compensation expense $ 427,000   $ 427,000   $ 1,460,000