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Stock Compensation (Narrative) (Details) - USD ($)
shares in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2021
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Capitalized stock compensation expense   $ 157,000 $ 125,000
ESPP Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESPP, percentage of market price for eligible employees   85.00%  
Employees purchased common stock, shares   36 30
RSAs, RSUs, And PSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized awards from approved stock incentive plans   381 255
Aggregate grant date market value   $ 9,500,000 $ 6,600,000
Unrecognized compensation costs   14,800,000  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs   $ 3,200,000  
Expected weighted-average period for recognizing the unrecognized compensation costs, in years   2 years 3 months 18 days  
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 8 months 12 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 4 months 24 days  
Performance Stock Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense   $ 960,000  
Expected weighted-average period for recognizing the unrecognized compensation costs, in years   1 year 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%
Maximum [Member] | Short-term 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 100.00%    
Officers [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants of stock options   226 212