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Shareholders' Equity, Stock Option Exercises (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock Option Exercises [Abstract] |  |  |
Proceeds from exercise of options | $ 610 | $ 218 | $ 4
Common Stock [Member] |  |  |
Stock Option Exercises [Abstract] |  |  |
Exercise of stock options (in shares) | 323,019 | 99,496 |
Proceeds from exercise of options | $ 610 | $ 218 |

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