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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2018
May 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Approved and authorized maximum number of shares to be issued (in shares)             2,400,000
Compensation expense related to stock based awards outstanding     $ 600   $ 1,700 $ 1,800  
Exercise of stock options (in shares)     256,833 13,710 488,303 173,518  
Proceeds received upon exercise of stock options     $ 1,500 $ 100 $ 2,815 $ 1,007  
Total unrecognized compensation expense     $ 4,600   $ 4,600    
Share-based compensation cost not yet recognized, period for recognition         2 years    
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options, expiration period         10 years    
Forfeiture rate         5.50%    
Grant-date fair value (in dollars per share)   $ 2.78          
Stock options | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options, vesting period         3 years    
Stock options | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options, vesting period         5 years    
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Forfeiture rate         5.50%    
Executive Officer | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted (in shares)   366,905          
Executive Officer | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted in period (in shares)   67,023          
Independent Directors And Certain Officers And Executives | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted in period (in shares)   331,095          
Grant date fair value (in dollars per share)   $ 7.46          
Independent Directors | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted in period (in shares)   60,320          
2017 LTIP | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Forfeiture rate         3.20%    
Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Exercise of stock options (in shares)         488,303    
Common Stock | Executive Officer | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted (in shares) 7,310            
Grant-date fair value (in dollars per share) $ 3.42            
Common Stock | Executive Officer | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant date fair value, other than options (in dollars per share) $ 9.03            
Granted in period (in shares) 2,769