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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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   $ 800 $ 900 $ 1,100 $ 1,200  
Exercise of stock options (in shares)   84,705 55,953 231,470 159,808  
Proceeds received upon exercise of stock options   $ 500 $ 300 $ 1,299 $ 940  
Total unrecognized compensation expense   $ 5,200   $ 5,200    
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%    
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%