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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2017
Jan. 01, 2008
Mar. 31, 2017
Feb. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2007
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options granted during period         0 0 0    
Intrinsic value of stock options exercised         $ 371 $ 591 $ 303    
Total fair value of stock options vested         $ 142 $ 142 $ 142    
Restricted Stock And Restricted Stock Unit [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Target restricted stock granted during period         12,500 13,500      
RSUs vested during period         82,000 78,500 0    
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     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
2005 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of stock option exercisable per year   25.00%           20.00%  
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          
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 $ 3,435 $ 0