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Share-Based Compensation (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2017
USD ($)
Jan. 01, 2008
Feb. 28, 2018
executive
Mar. 31, 2017
USD ($)
shares
Feb. 29, 2016
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
shares
Feb. 28, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of executives | executive     4                
Vesting term             4 years        
Intrinsic value of stock options exercised | $           $ 371 $ 42   $ 591    
Total fair value of stock options vested | $             $ 0 $ 142 $ 142    
Target restricted stock granted during period             20,500        
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period             3 years        
Restricted Stock And Restricted Stock Unit [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
RSU available for issuance (in share)             75,250 169,000 271,000 263,250  
Granted, shares (in shares)             0 0 95,750    
RSUs vested during period (in shares)             0 82,000 78,500    
Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Equity instruments other than options, vested in period, fair value | $       $ 3,600              
RSUs vested during period (in shares)       61,444.90 146,896            
2015 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares authorized (in shares)                     4,900,000
Options granted during period               0 0    
Compensation expense not yet recognized | $             $ 500        
Compensation expense not yet recognized, period for recognition             3 years 1 month 9 days        
2015 Plan [Member] | Employee Stock Option [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of options available for issuance (in shares)             80,000        
2015 Plan [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
RSU available for issuance (in share)             75,250        
2005 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Percentage of stock option exercisable per year             25.00%        
Stock option expiration period (in years)   10 years                  
Common Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued during period         88,074            
Shares withheld for payroll taxes         58,822            
Common Stock [Member] | 2015 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares available for issuance (in shares)             4,744,750        
Additional Paid-in Capital [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Reclassification of restricted stock units from equity to liability award | $ $ 200           $ 0 $ 0 $ 3,435