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General & Administrative Expenses, Stock compensation series (Details) | 12 Months Ended
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Dec. 31, 2019 shares $ / shares
October 2005 [Member] | Stock Options [Member] |
Stock Compensation Series [Abstract] |
Number of stock options (in shares) | 965
Vesting period | 10 years
Fair value at grant date of stock options (in dollars per share) | $ / shares | $ 144.00
March 2012 [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 14,515
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 13.80
June 2013 One [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 155,000
Vesting period | 4 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 4.15
June 2013 Two [Member] | Stock Options [Member] |
Stock Compensation Series [Abstract] |
Number of stock options (in shares) | 155,000
Vesting period | 5 years
Fair value at grant date of stock options (in dollars per share) | $ / shares | $ 1.31
June 2013 Three [Member] | Stock Options [Member] |
Stock Compensation Series [Abstract] |
Number of stock options (in shares) | 155,000
Vesting period | 5 years
Fair value at grant date of stock options (in dollars per share) | $ / shares | $ 0.97
February 2014 One [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 29,333
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 6.92
February 2014 Two [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 29,333
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 6.33
February 2014 Three [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 29,333
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 5.63
February 2014 Four [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 88,000
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 7.61
June 2014 One [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 95,666
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 6.41
June 2014 Two [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 95,666
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 5.74
June 2014 Three [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 95,666
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 5.13
June 2014 Four [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 287,000
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 7.15
January 2015 [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 850,000
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 8.81
January 2016 [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 824,000
Vesting period | 2 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 6.65
January 2017 [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 900,000
Vesting period | 2 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 4.61
January 2018 One [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 355,000
January 2018 One [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 355,000
Vesting period | 1 year
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 3.92
January 2018 Two [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 212,000
January 2018 Two [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 212,000
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 2.30
January 2019 One [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 360,000
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 4.25
January 2019 Two [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 200,000
Vesting period | 3 years
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 3.04
March 2019 [Member] | Restricted Shares [Member] |
Stock Compensation Series [Abstract] |
Number of restricted shares (in shares) | 210,000
Vesting period | 1 year
Fair value at grant date of restricted shares (in dollars per share) | $ / shares | $ 4.60

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