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Employee Benefits and Share-Based Compensation - Performance-based Restricted Stock Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 06, 2018
Feb. 06, 2018
Mar. 07, 2017
Feb. 08, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Performance Shares              
Number of Shares              
Share-based Compensation Arrangement by Share-based Payment Award, Trading Days   20 days   20 days      
2009 Plan | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)         4 years    
Number of Shares              
Nonvested, beginning balance (in shares)         501,000    
Granted (Awarded) (in shares)         312,000    
Vested (Released) (in shares)         (213,000)    
Forfeited (in shares)         (62,000)    
Nonvested, ending balance (in shares)         538,000 501,000  
Weighted-Average Grant Date Fair Value              
Nonvested, beginning balance (in dollars per share)         $ 38.90    
Granted (Awarded) (in dollars per share)         59.52 $ 45.97 $ 32.58
Vested (Released) (in dollars per share)         37.14    
Forfeited (in dollars per share)         39.00    
Nonvested, ending balance (in dollars per share)         $ 51.52 $ 38.90  
Unrecognized compensation cost         $ 24.1    
Weighted average period of compensation cost recognized (in years)         2 years 10 months 2 days    
2009 Plan | Performance Shares              
Number of Shares              
Nonvested, beginning balance (in shares)         225,000    
Vested (Released) (in shares)         (106,000)    
Forfeited (in shares)         (32,000)    
Nonvested, ending balance (in shares)         197,000 225,000  
Weighted-Average Grant Date Fair Value              
Nonvested, beginning balance (in dollars per share)         $ 31.18    
Granted (Awarded) (in dollars per share)         38.03 $ 34.05 $ 24.66
Vested (Released) (in dollars per share)         30.54    
Forfeited (in dollars per share)         34.47    
Nonvested, ending balance (in dollars per share)         $ 34.83 $ 31.18  
Vested in period, fair value         $ 3.2 $ 2.6 $ 2.0
Unrecognized compensation cost         $ 2.5    
Weighted average period of compensation cost recognized (in years)         1 year 1 month 28 days    
2009 Plan | Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)         4 years    
Weighted-Average Grant Date Fair Value              
Weighted average period of compensation cost recognized (in years)         2 years 10 months 17 days    
2016 Performance Based Restricted Stock Units | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentile rank of stockholder return     71.50%        
Percentage of shares eligible for time-based vesting     100.00%        
Awards eligible for vesting (in shares)     122,740        
Percentage of award vesting     25.00%        
Vesting period (in years)         36 months    
Awards vested by period end (in shares)         89,350    
2017 Performance Based Restricted Stock Units | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentile rank of stockholder return 60.00%            
Percentage of shares eligible for time-based vesting 100.00%            
Awards eligible for vesting (in shares) 147,830            
Percentage of award vesting 25.00%            
Vesting period (in years)         36 months    
Awards vested by period end (in shares)         55,860    
Officer | Performance Shares              
Number of Shares              
Granted (Awarded) (in shares)         110,432 147,830  
Vesting in equal monthly installments | 2009 Plan | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)         3 years    
Vesting in equal monthly installments | 2009 Plan | Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period (in years)         36 months