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General & Administrative Expenses- Shares held by directors and executives (Details) - shares
 12 Months Ended
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.