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Stock Option Plan (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Oct. 21, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercised |  |  |
Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
In-the-money options exercised |  | $ 10 |
Options exercised | 0 |  |
1999 Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares not granted |  |  | 25,832

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