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Stock Compensation (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESPP, percentage of discounted price from market price 85.00%    
Actual percentage of target number of shares of common stock granted as Performance Stock Units     125.00%
Employees purchased common stock, shares 49,000 35,000  
Capitalized stock compensation expense $ 64,000 $ 55,000  
RSAs And PSUs [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 324,000 317,000  
Aggregate market value of issued stock incentive plans 1,900,000 1,700,000  
RSA, RSU, And PSU Expense [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs 3,700,000    
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 6 months 18 days    
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 162,000 159,000  
Unrecognized compensation costs $ 1,100,000    
Expected weighted-average period for recognizing the unrecognized compensation costs, in years 1 year 10 months 10 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    
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 1 year 6 months 22 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 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%