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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted shares issued 10,600 10,750  
Exercise of stock options, shares   2,100  
Stock options outstanding 0 14,350 16,450
Incentive Equity And Deferred Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of issuable shares of common stock 493,101    
Share issuance, restricted sale period 1 year    
Shares available for future grants 482,501    
Stock based compensation $ 61 $ 96  
Share based compensation cost not yet recognized $ 651    
Share based compensation cost not yet recognized, period for recognition 1 year 10 months 6 days    
Incentive Equity And Deferred Compensation Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted shares issued   1,400  
Increase in shares outstanding   896  
Cash equivalent shares used to pay taxes   504  
Employees And Directors Stock Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of issuable shares of common stock 793,368    
Shares available for future grants 354,090    
Stock based compensation $ 0 $ 0  
Exercise of stock options, shares 0 2,100  
Increase in shares outstanding   966  
Cash equivalent shares used to pay taxes   1,134  
Maximum [Member] | Incentive Equity And Deferred Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award issuable period after date of grant 4 years    
Cliff-vesting period 4 years    
Maximum [Member] | Employees And Directors Stock Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum option exercise period 10 years    
Minimum [Member] | Incentive Equity And Deferred Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award issuable period after date of grant 3 years    
Cliff-vesting period 3 years