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Fair Value Measurements (Details Textual) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2011 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value Measurements (Textual) |  |  |
Financial instrument included in other assets |  | $ 1.4 | $ 1.5
GOGAS [Member] |  |  |
Fair Value Measurements (Textual) |  |  |
Stock option issued, exercise price | $ 5.0 |  |
Fair value of the GOGAS stock option |  |  |
Investment options, expiration date | Apr. 09, 2015 |  |

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