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Stock Compensation (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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   92.00%  
Total fair value $ 7,300,000 $ 11,100,000 $ 2,900,000
Employees purchased common stock, shares 83,000 93,000 90,000
Capitalized stock compensation expense $ 484,000 $ 394,000 $ 274,000
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   426,000 490,000
Aggregate grant date market value   $ 7,100,000 $ 5,500,000
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants of stock options 219,000 260,000 387,000
Unrecognized compensation costs $ 1,900,000    
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 4 months 24 days    
RSAs, RSUs, PSUs, And PSAs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized awards from approved stock incentive plans 328,000    
Aggregate grant date market value $ 7,500,000    
Unrecognized compensation costs $ 6,500,000    
Restricted Stock Awards (RSAs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized awards from approved stock incentive plans 128,000 138,000 216,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized awards from approved stock incentive plans 115,000 196,000 146,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 7 months 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 104,000 126,000 144,000
Percentage of target number of shares of common stock granted as Performance Stock Units 80.00%   142.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 8 months 12 days    
Performance Stock Awards (PSAs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized awards from approved stock incentive plans
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%    
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%