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Stock-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 13, 2019
Sep. 11, 2017
Feb. 28, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Surrendered stock options (in shares)       7,000 168,000 0
Proceeds from stock options exercised       $ 864,000 $ 1,442,000 $ 6,244,000
Tax benefit from stock options exercised       $ 200,000 $ 700,000 $ 2,600,000
Options granted (in shares)       119,000 92,000 243,000
Restricted stock granted (in shares)       167,000 133,000 77,000
Restricted stock vested (in shares)       109,000 119,000 146,000
Term of plans / awards       10 years    
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       1 year    
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       4 years    
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Modification expense       $ 0 $ 0 $ 0
Unrecognized pre-tax stock-based compensation expense       $ 1,900,000    
Unrecognized pre-tax stock-based compensation expense, period for recognition       1 year 8 months 12 days    
Term of plans / awards       10 years    
Stock Options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Stock Options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       4 years    
Non-Vested Restricted Stock Award            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized pre-tax stock-based compensation expense       $ 6,900,000    
Unrecognized pre-tax stock-based compensation expense, period for recognition       1 year 8 months 12 days    
Non-Vested Restricted Stock Award | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       1 year    
Non-Vested Restricted Stock Award | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Stock Appreciation Rights and Performance Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted to date (in shares)       0    
Outside Directors            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Surrendered stock options (in shares)   150,000        
Outside Directors | Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Acceleration of stock-based compensation expense         $ 1,200,000  
Certain Executive Employees | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares) 150,780          
Certain Executive Employees | Stock Options | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period 3 years          
Grant date fair value of stock options $ 1,600,000          
Certain Executive Employees | Stock Options | Vesting on February 13, 2020 | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage 33.33%          
Certain Executive Employees | Stock Options | Vesting Quarterly Thereafter | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage 8.33%          
Certain Executive Employees | Non-Vested Restricted Stock Award | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     3 years      
Restricted stock granted (in shares)     210,927      
Grant date fair value of restricted stock     $ 6,000,000      
Certain Executive Employees | Non-Vested Restricted Stock Award | Vesting on February 13, 2020 | Subsequent Event | Forecast            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage     33.33%      
Restricted stock vested (in shares)     57,270      
Certain Executive Employees | Non-Vested Restricted Stock Award | Vesting Quarterly Thereafter | Subsequent Event | Forecast            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage     8.33%      
Certain Executive Employees | Non-Vested Restricted Stock Award | Vesting on February 19, 2020 | Forecast            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage     33.33%      
Restricted stock vested (in shares)     153,657