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Share-Based Employee Compensation - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
plan
$ / shares
shares
Jun. 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 $ 2,483,000 $ 1,297,000 $ 4,535,000 $ 6,667,000  
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 $ 368,000 $ 129,000 $ 744,000  
Total unrecognized compensation expense related to non-vested shares granted 64,000   $ 64,000    
Number of years compensation expense to be recognized over     1 year 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 $ 7,119,000   $ 7,119,000    
Number of years compensation expense to be recognized over     1 year 8 months 19 days    
Number of stock units granted | shares 43,000 142,000 539,000 548,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares $ 9.22 $ 9.50 $ 8.66 $ 8.29  
Compensation expense related to restricted stocks $ 1,062,000 $ 841,000 $ 2,102,000 $ 1,761,000  
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 $ 7,047,000   $ 7,047,000    
Number of years compensation expense to be recognized over     1 year 7 months 13 days    
Vesting period     3 years    
Number of stock units granted | shares 0 26,000 420,000 509,000  
Stock units, weighted average grant-date fair value (usd per share) | $ / shares   $ 9.55 $ 8.61 $ 7.96  
Cost (reversal) of employee share-based compensation included in income, before income tax $ 1,064,000 $ 526,000 $ 2,097,000 $ 1,056,000  
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     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 0 0   0  
Cost (reversal) of employee share-based compensation included in income, before income tax $ 0 $ 73,000 $ 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 350,000 $ (511,000) $ 207,000 $ 2,716,000  
Accrued compensation expense $ 361,000   $ 361,000   $ 1,460,000