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Stock Compensation (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) item shares | Sep. 30, 2018 USD ($) shares | Dec. 31, 2018 | Sep. 30, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Capitalized stock compensation expense | $ 158 | $ 125 | $ 458 | $ 363 |  |
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 |  |  | 61,000 | 82,000 |  | 0
RSAs, RSUs, And PSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized awards from approved stock incentive plans | shares |  |  | 503,000 | 317,000 |  |
Aggregate grant date market value |  |  | $ 14,900 | $ 7,100 |  |
Unrecognized compensation costs | 14,300 |  | 14,300 |  |  | $ 14,300
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation costs | $ 2,400 |  | $ 2,400 |  |  | $ 2,400
Expected weighted-average period for recognizing the unrecognized compensation costs, in years |  |  | 1 year 8 months 12 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 3 months 18 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 8 months 12 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 |  |  |
Percentage of target number of shares of common stock granted as Performance Stock Units |  |  |  |  | 80.00% |
Expected weighted-average period for recognizing the unrecognized compensation costs, in years |  |  | 2 years 7 months 6 days |  |  |
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 |  |  | 169,000 | 219,000 |  |

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