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General & Administrative Expenses, Valuation of stock compensation (Details) | 1 Months Ended | 12 Months Ended
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May 31, 2019 shares $ / shares | Mar. 31, 2019 shares | Feb. 28, 2019 shares | Jan. 31, 2019 shares | Oct. 31, 2018 shares | Feb. 28, 2018 shares | Jan. 31, 2018 shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock, vested (in shares) | [1] |  |  |  |  |  |  |  | 755,500 | 1,085,331 | 1,132,988
Number of restricted stock, forfeited (in shares) |  |  |  |  |  |  |  |  | 0 | 22,500 | 57,501
January 2019 [Member] | Management [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  |  |  | 560,000 |  |  |  |  |  |
Number of restricted stock, vested subject to certain market conditions (in shares) |  | 200,000 |  |  |  |  |  |  |  |  |
March 2019 [Member] | Broad of Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  | 210,000 |  |  |  |  |  |  |  |
January 2018 [Member] | Management and Broad of Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  |  |  |  |  |  | 567,000 |  |  |
January 2018 One [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  |  |  |  |  |  |  | 355,000 |  |
January 2018 One [Member] | Management [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of shares vested, fair value (in dollars per share) | $ / shares |  | $ 3.04 |  |  |  |  |  |  |  |  |
January 2018 One [Member] | Management and Broad of Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock, vested (in shares) |  |  |  | 78,500 |  |  | 264,000 |  |  |  |
Number of restricted stock, forfeited (in shares) |  |  |  |  |  | 12,500 |  |  |  |  |
January 2018 Two [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  |  |  |  |  |  |  | 212,000 |  |
Number of shares vested, fair value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 2.30 |  |
January 2018 Two [Member] | Management and Broad of Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock, vested subject to certain market conditions (in shares) |  |  |  |  |  | 202,000 |  |  |  |  |
Number of restricted stock, forfeited subject to certain market conditions (in shares) |  |  |  |  |  | 10,000 |  |  |  |  |
[1] | Does not include shares in lieu of dividends

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