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Capital Stock (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Apr. 02, 2018
Common stock |  |  |  |  |  |  |
Common Stock- Shares Authorized | 80,000,000 |  |  | 80,000,000 |  | 80,000,000 |
Common Stock- Shares Issued | 45,639,892 |  |  | 45,639,892 |  | 45,124,309 |
Common Stock- Shares Outstanding | 37,894,385 |  |  | 37,894,385 |  | 37,378,802 |
Preferred Stock |  |  |  |  |  |  |
Preferred stock issued or outstanding | 0 |  |  | 0 |  |  |
Preferred Stock - Shares Authorized | 5,000,000 |  |  | 5,000,000 |  | 5,000,000 |
Employee Stock Purchase Plan (as amended, the ESPP) |  |  |  |  |  |  |
Total amount of common stock issued under ESOP | 984,547 |  |  | 984,547 |  |  |
Employee Stock Purchase Plan Shares Authorized | 1,400,000 |  |  | 1,400,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date | 85.00% |  |  |  |  |  |
Stock issued during the year, Shares, Employee Stock Purchase Plans | 94,000 |  | 25,000 | 93,785,000 | 24,907 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 20,908,929
Increase In Number Of Shares Authorized For Issuance Under Stock Option And Incentive Plan |  |  |  |  |  |  | 3,400,000
Target number of these restricted stock units |  |  |  | 599,977 |  |  |
Deferred Compensation Arrangement with Individual, Maximum Contractual Term | 10 years |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  | 3,300,586 | 4,737,057 |  |
Weighted Average Estimated Black Scholes Value Of Option Grants | $ 0.97 |  | $ 1.81 | $ 1.56 | $ 1.81 |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 0 |  | $ 3 | $ 0 | $ 8 |  |
Maximum percentage of target number of restricted stock units | 150.00% |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value |  |  |  | $ 3.73 |  |  |
Stock options, Granted |  |  |  | 587,909 |  |  |
Market Condition Restricted Stock Unit [Member] |  |  |  |  |  |  |
Employee Stock Purchase Plan (as amended, the ESPP) |  |  |  |  |  |  |
Target number of these restricted stock units |  |  |  | 75,514 |  |  |
2018 Market Condition RSUs [Member] |  |  |  |  |  |  |
Employee Stock Purchase Plan (as amended, the ESPP) |  |  |  |  |  |  |
Target number of these restricted stock units |  |  |  | 7,556 |  |  |
Maximum percentage of target number of restricted stock units |  |  |  | 150.00% |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value |  |  |  |  | $ 4.19 |  |
2019 Market Condition RSUs [Member] |  |  |  |  |  |  |
Employee Stock Purchase Plan (as amended, the ESPP) |  |  |  |  |  |  |
Target number of these restricted stock units |  |  |  | 56,517 |  |  |
Maximum percentage of target number of restricted stock units |  |  |  | 150.00% |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value |  | $ 4.16 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Employee Stock Purchase Plan (as amended, the ESPP) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Employee Stock Purchase Plan (as amended, the ESPP) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |  |  |

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