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Stock Compensation (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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 125.00%    
Employees purchased common stock, shares 72,000 64,000 43,000
Capitalized stock compensation expense $ 214,000 $ 224,000 $ 299,000
RSAs To Non-Employee Directors And RSAs And PSUs To Certain Company Officers [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized stock incentive plans to non-employee Directors and certain Company officers, shares 451,000    
Aggregate market value of issued stock incentive plans 2,400,000    
RSAs And RSUs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized stock incentive plans to non-employee Directors and certain Company officers, shares   421,000 278,000
Aggregate market value of issued stock incentive plans   2,200,000 1,700,000
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized stock incentive plans to certain Company officers and employees, shares 159,000 599,000 451,000
Unrecognized compensation costs 976,000    
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 2 months 9 days    
RSA, RSU, And PSU Expense [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs $ 2,500,000    
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 29 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 2 months 27 days    
Performance Stock Units (PSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 11 months 5 days    
2009 Employee Stock Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase in shares authorized under plan 2,100,000    
1996 Discounted Employee Stock Purchase Plan, As Amended [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase in shares authorized under plan     1,000,000
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 50.00%    
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%