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Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended 36 Months Ended
Sep. 30, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 07, 2018
Mar. 13, 2013
Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock units awarded (in shares)   57,089 22,000 4,020            
Stock-based compensation expense   $ 900,000 $ 900,000 $ 900,000            
Vested (in shares)   173,240 26,399 54,215            
Weighted average remaining recognition period of unrecognized stock-based compensation costs (in years)   2 years 3 months 18 days 2 years 1 month 6 days 2 years 9 months 18 days            
Performance Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock units awarded (in shares)   55,640 29,494 99,466            
Vesting period 3 years                  
Stock-based compensation expense   $ 1,400,000 $ 1,300,000 $ 1,800,000            
Vested (in shares)   66,657 61,919 84,417            
Weighted average remaining recognition period of unrecognized stock-based compensation costs (in years)   1 year 7 months 6 days                
Performance Shares | Maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation costs related to unvested options   $ 9,700,000       $ 9,700,000        
Long-term incentive plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Maximum number of shares of common stock available for awards (in shares)                 3,775,000 2,975,000
Shares remaining available for awards (in shares)   940,529       940,529        
Long-term incentive plan | Stock Options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)   0 0 0            
Stock-based compensation expense not recognized by employer   $ 0 $ 0 $ 0   $ 0 $ 0 $ 0    
Executive Officer | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock units awarded (in shares)     0 4,020            
Executive Officer | Performance Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period     3 years 3 years   3 years 3 years 3 years    
Stock-based compensation expense   $ 200,000 $ 200,000 $ 100,000            
Shares recognized in period (in shares)   15,497 7,529 2,083            
Vested (in shares)   51,160 54,390 82,334            
Forecast | Performance Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period         3 years          
Tranche 1 | Executive Officer | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock units awarded (in shares)   48,663                
Vesting period   3 years                
Tranche 2 | Executive Officer | Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock units awarded (in shares)   8,426                
Vesting period   5 years