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Stock Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Capitalized stock compensation expense $ 125 $ 111 $ 363 $ 288  
ESPP Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
ESPP, percentage of market price for eligible employees     85.00%    
Employees purchased common stock, shares 46,000 47,000 82,000 93,000  
RSAs, RSUs, And PSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized awards from approved stock incentive plans     317,000 384,000  
Aggregate grant date market value     $ 7,100 $ 6,300  
Unrecognized compensation costs $ 7,900   7,900    
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs $ 2,200   $ 2,200    
Expected weighted-average period for recognizing the unrecognized compensation costs, in years     1 year 8 months 12 days    
Restricted Stock Awards (RSAs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected weighted-average period for recognizing the unrecognized compensation costs, in years     1 year 2 months 12 days    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected weighted-average period for recognizing the unrecognized compensation costs, in years     1 year 10 months 24 days    
Performance Stock Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized awards from approved stock incentive plans       0  
Percentage of target number of shares of common stock granted as Performance Stock Units         100.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years     1 year    
Minimum [Member] | Performance Stock Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of target number of shares of common stock granted as Performance Stock Units     60.00%   60.00%
Maximum [Member] | Performance Stock Units (PSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of target number of shares of common stock granted as Performance Stock Units     150.00%   150.00%
Officers [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants of stock options     219,000 260,000