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Stock Compensation (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employees purchased common stock, shares 45 38 45 38  
Capitalized stock compensation expense $ 109 $ 75 $ 177 $ 132  
ESPP Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
ESPP, percentage of market price for eligible employees     85.00%    
RSAs, RSUs, And PSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized awards from approved stock incentive plans     312 463  
Aggregate grant date market value     $ 5,400 $ 5,100  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs 2,500   $ 2,500    
Expected weighted-average period for recognizing the unrecognized compensation costs, in years     1 year 7 months 6 days    
RSAs, RSUs, PSUs, And PSAs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs $ 8,300   $ 8,300    
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 7 months 6 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 3 months 18 days    
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         142.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years     1 year 2 months 12 days    
Performance Stock Awards (PSAs) [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 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     260 384