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Stock-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Feb. 12, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from stock options exercised   $ 448,000 $ 864,000 $ 1,442,000
Tax benefit from stock options exercised   $ 10,000 $ 200,000 $ 700,000
Options granted (in shares)   170,000 119,000 92,000
Restricted stock granted (in shares)   268,000 167,000 133,000
Restricted stock vested (in shares)   141,000 109,000 119,000
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   $ 2,200,000    
Unrecognized pre-tax stock-based compensation expense, period for recognition   1 year 10 months 24 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   $ 7,200,000    
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    
Certain Executive Employees | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) 108,755      
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 $ 1,900,000      
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) 41,695      
Grant date fair value of restricted stock $ 1,900,000      
Certain Executive Employees | Non-Vested Restricted Stock Award | 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 | Non-Vested Restricted Stock Award | Vesting Quarterly Thereafter | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights percentage 8.33%