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Stock Compensation (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2019 item
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 |  |  |  |  | 83.00%
Capitalized stock compensation expense | $ 160,000 | $ 158,000 | $ 456,000 | $ 458,000 |
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 | shares | 0 | 0 | 84,000 | 61,000 |
RSAs, RSUs, And PSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Authorized awards from approved stock incentive plans | shares |  |  | 330,000 | 503,000 |
Aggregate grant date market value |  |  | $ 8,200,000 | $ 14,900,000 |
Unrecognized compensation costs | $ 12,500,000 |  | 12,500,000 |  |
Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation costs | $ 2,500,000 |  | $ 2,500,000 |  |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years |  |  | 1 year 9 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 2 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 |  |  | 1 year 9 months 18 days |  |
Performance Stock Units (PSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of performance stock unit grants | item |  |  |  |  | 2
Expected weighted-average period for recognizing the unrecognized compensation costs, in years |  |  | 1 year 10 months 24 days |  |
Short-term PSUs [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 1 year |  |
Long-term PSUs [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 5 years |  |
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 |  |  |  |  | 150.00%
Maximum [Member] | Long-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 |  |  |  |  | 288.00%
Officers [Member] | Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grants of stock options | shares |  |  | 212,000 | 169,000 |
Executive Officer [Member] | Maximum [Member] | Long-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 |  |  |  |  | 192.00%

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