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Proxy Contest (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2018 director
Other Income and Expenses [Abstract] |  |  |  |  |
Number of directors nominated by shareholder |  |  |  |  | 5
Number of directors on board |  |  |  |  | 8
Proxy contest | $ | $ (459) | $ 0 | $ 7,139 | $ 0 |

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