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Stock Compensation (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Actual percentage of target number of shares of common stock granted as Performance Stock Units 127.00% 50.00%   115.00%
Granted, Shares 328,000 562,000 162,000  
Employees purchased common stock, shares 78,000 111,000 97,000  
Capitalized stock compensation expense $ 237,000 $ 261,000 $ 228,000  
RSAs To Non-Employee Directors, RSUs To Certain Employees, And RSAs And PSUs To Certain Company Officers [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares   655,000 467,000  
Aggregate market value of shares granted under approved stock incentive plans   $ 6,600,000 $ 3,100,000  
RSAs, RSUs, PSUs, And PSAs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 405,000      
Aggregate market value of shares granted under approved stock incentive plans $ 4,300,000      
Unrecognized compensation costs $ 4,300,000      
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares 328,000 562,000 162,000  
Unrecognized compensation costs $ 1,800,000      
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 9 months 18 days      
Performance Stock Awards (PSAs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares      
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 8 months 12 days      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 88,000 5,000 73,000  
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 2 years      
Restricted Stock Awards (RSAs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 207,000 232,000 232,000  
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 2 months 12 days      
Performance Stock Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized from approved stock incentive plans to certain Company officers, non-employee Directors, and certain eligible employees, shares 125,000 185,000    
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 8 months 12 days      
Minimum [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]        
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%      
2009 Employee Stock Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Increase in shares authorized under plan   3,000,000