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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

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