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Stock Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Capitalized stock compensation expense $ 132 $ 109 $ 238 $ 177  
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 0 0 36,000 45,000  
RSAs, RSUs, And PSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized awards from approved stock incentive plans     305,000 312,000  
Aggregate grant date market value     $ 6,800 $ 5,400  
Unrecognized compensation costs $ 9,500   9,500    
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs $ 2,700   $ 2,700    
Expected weighted-average period for recognizing the unrecognized compensation costs, in years     1 year 10 months 24 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 4 months 24 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     2 years 1 month 6 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         90.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years     1 year 2 months 12 days    
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