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General & Administrative Expenses- Shares held by directors and executives (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
General & Administrative Expenses [Abstract] |  |  |  |
Number of shares held by Directors and Executives as a group (in shares) | [1] | 3,615,221 | 3,155,503 | 2,729,680
Number of restricted stock subject to vesting conditions (in shares) |  | 440,000 | 465,000 | 906,666
Base salary entitled to executive officer for termination of employment |  | 18 months |  |
[1] | Includes 440,000 (2018: 465,000, 2017: 906,666) shares of restricted stock subject to vesting conditions.

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- Definition Period base salary has to be paid to an executive officer upon termination of employment. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The number of other equity instruments (ie other than share options) subject to vesting conditions in a share-based payment arrangement. + References No definition available. + Details
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- Definition The number of shares held by executives and directors as a group during the period. + References No definition available. + Details
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