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General & Administrative Expenses, Outstanding restricted common stock and share options (Details) | 12 Months Ended
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Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Restricted common stock [Abstract] |  |  |  |
Outstanding beginning of period (in shares) |  | 560,000 | 545,500 | 1,086,331
Granted (in shares) |  | 810,000 | 770,000 | 567,000
Exercised (in shares) | [1] | 550,002 | 755,500 | 1,085,331
Forfeited (in shares) |  | 0 | 0 | 22,500
Outstanding end of period (in shares) |  | 819,998 | 560,000 | 545,500
Share options |  |  |  |
Outstanding beginning of period (in shares) |  | 0 | 0 | 310,000
Forfeited (in shares) |  |  |  | 310,000
Outstanding end of period (in shares) |  | 0 | 0 | 0
Weighted average exercise price |  |  |  |
Outstanding beginning of period (in dollars per share) | $ / shares | [2] | $ 0 | $ 0 | $ 9.64
Forfeited (in dollars per share) | $ / shares | [2] |  |  | 9.64
Outstanding end of period (in dollars per share) | $ / shares | [2] | $ 0 | $ 0 | $ 0
[1] | Does not include shares in lieu of dividends
[2] | To be adjusted for dividends declared and paid subsequent to the respective grant dates.

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