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Stock Compensation (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value $ 2,900,000 $ 4,800,000 $ 5,000,000  
Employees purchased common stock, shares 90,000 78,000 111,000  
Capitalized stock compensation expense $ 274,000 $ 237,000 $ 261,000  
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   405,000 655,000  
Aggregate grant date market value   $ 4,300,000 $ 6,600,000  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants of stock options 387,000 328,000 562,000  
Unrecognized compensation costs $ 1,800,000      
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]        
Authorized awards from approved stock incentive plans 490,000      
Aggregate grant date market value $ 5,500,000      
Unrecognized compensation costs $ 5,100,000      
Restricted Stock Awards (RSAs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized awards from approved stock incentive plans 216,000 207,000 232,000  
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 3 months 18 days      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized awards from approved stock incentive plans 146,000 88,000 5,000  
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 144,000 125,000 185,000  
Percentage of target number of shares of common stock granted as Performance Stock Units 142.00% 127.00%   50.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 9 months 18 days      
Performance Stock Awards (PSAs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized awards from approved stock incentive plans 250,000  
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 8 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%      
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%