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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 01, 2017 | May 22, 2014 | Jan. 06, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Aggregate intrinsic value, option shares outstanding |  |  |  | $ 2.4 |  |
Reduction in outstanding options exercise price |  |  | $ 2.00 |  |  |
Number of shares available for issuance following increase |  | 1,678,632 |  |  |  |
Shares available for grant |  |  |  | 1,049,752 | 1,305,440 | 1,389,506
Amount of compensation exchanged for deferred stock units |  |  |  | $ 0.3 | $ 2.0 | $ 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 |  |  |  | 184,277 | 255,547 | 293,860
Weighted average remaining term, option shares outstanding |  |  |  | 10 months 22 days |  |
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 6 months |  |
Unrecognized compensation costs |  |  |  | $ 14.4 |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Unrecognized compensation costs, weighted-average recognition period |  |  |  | 5 months |  |
Unrecognized compensation costs |  |  |  | $ 0.5 |  |
Stock Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Unrecognized compensation costs, weighted-average recognition period |  |  |  | 1 year 5 months |  |
Unrecognized compensation costs |  |  |  | $ 7.6 |  |
Stock awards, performance period |  |  |  | 3 years |  |
Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Deferred stock units, value | $ 6.9 |  |  |  |  |

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