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Stock Compensation (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value $ 11,100,000 $ 2,900,000 $ 4,800,000
Employees purchased common stock, shares 93,000 90,000 78,000
Capitalized stock compensation expense $ 394,000 $ 274,000 $ 237,000
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   490,000 405,000
Aggregate grant date market value   $ 5,500,000 $ 4,300,000
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants of stock options 260,000 387,000 328,000
Unrecognized compensation costs $ 1,600,000    
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 6 months    
RSAs, RSUs, PSUs, And PSAs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized awards from approved stock incentive plans 426,000    
Aggregate grant date market value $ 7,100,000    
Unrecognized compensation costs $ 6,100,000    
Restricted Stock Awards (RSAs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized awards from approved stock incentive plans 138,000 216,000 207,000
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 1 month 6 days    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized awards from approved stock incentive plans 196,000 146,000 88,000
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 126,000 144,000 125,000
Percentage of target number of shares of common stock granted as Performance Stock Units 92.00% 142.00% 127.00%
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%