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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2014
Common Stock, Capital Shares Reserved for Future Issuance | 596,000 |  | 1,200,000
Shares for Cancelled or Forfeited Awards | 120,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 0.1 |  |
Weighted-average period in years of costs to be recognized | 3 months |  |
Restricted stock units potentially converted to common stock shares | 141,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 6 years 3 months 19 days | 7 years 3 months 19 days |
Employee Stock Option [Member] |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 0.1 |  |

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