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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 06, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Reduction in outstanding options exercise price | $ 2.00 |  |  |
Shares available for grant |  | 737,689 | 1,049,752 | 1,305,440
Amount of compensation exchanged for deferred stock units |  | $ 6.9 | $ 0.3 | $ 2.0
Minimum percentage stock option exercise price must be equal to fair market value |  | 100.00% |  |
Minimum holding period of common stock |  | 6 months |  |
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options |  | 104,073 | 184,277 | 255,547
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Expiration period in years |  | 10 years |  |
Deferred Stock Units, Restricted Stock and Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Deferred stock units, per share | $ 2.00 |  |  |
Value of stock issued during period | $ 1.8 |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Expiration period of stock options |  | 6 years |  |
Vesting period |  | 5 years |  |
Deferred Stock Unit |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized compensation costs, weighted-average recognition period |  | 1 year 3 months |  |
Unrecognized compensation costs |  | $ 14.2 |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized compensation costs, weighted-average recognition period |  | 5 months 25 days |  |
Unrecognized compensation costs |  | $ 0.6 |  |
Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized compensation costs, weighted-average recognition period |  | 10 months 17 days |  |
Unrecognized compensation costs |  | $ 10.6 |  |
Stock awards, performance period |  | 3 years |  |

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