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General & Administrative Expenses, Stock compensation expense (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) shares $ / shares | Dec. 31, 2018 USD ($) shares $ / shares | Dec. 31, 2017 USD ($) shares $ / shares
General & Administrative Expenses [Abstract] |  |  |
Expense recognized from stock compensation | $ | $ 2,532 | $ 2,458 | $ 4,806
Stock compensation expense [Abstract] |  |  |
Contractual life for outstanding stock compensation series | 10 months 13 days |  |
Vesting value $4.61 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares | $ 4.61 |  |
Number of shares vested (in shares) | shares | 281,094 |  |
Vesting value $3.92 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares | $ 3.92 |  |
Number of shares vested (in shares) | shares | 80,101 |  |
Vesting value $2.30 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares | $ 2.30 |  |
Number of shares vested (in shares) | shares | 212,823 |  |
Vesting value $3.04 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares | $ 3.04 |  |
Number of shares vested (in shares) | shares | 206,118 |  |
Vesting value $4.60 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares | $ 4.60 |  |
Number of shares vested (in shares) | shares | 10,435 |  |
Vesting value $3.38 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares |  | $ 3.38 |
Number of shares vested (in shares) | shares |  | 891,136 |
Vesting value $3.50 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares |  | $ 3.50 |
Number of shares vested (in shares) | shares |  | 264,000 |
Vesting value $4.30 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares |  | $ 4.30 |
Number of shares vested (in shares) | shares |  | 20,000 |
Vesting value $4.83 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares |  |  | $ 4.83
Number of shares vested (in shares) | shares |  |  | 1,189,100
Vesting value $3.68 [Member] |  |  |
Stock compensation expense [Abstract] |  |  |
Fair value of shares vested (in dollars per share) | $ / shares |  |  | $ 3.68
Number of shares vested (in shares) | shares |  |  | 70,108

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