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Stockholders' equity and dividend payment (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' equity and dividend payment (Tables) [Abstract] |
Stockholders' equity | Stockholders' equity:
(Dollars in thousands, except per share data) |  | Common stock |  |  | Preferred stock |
Issued at December 31, 2016 |  |  | 93,433,804 |  |  |  |
Restricted stock issued |  |  | 1,259,208 |  |  |  |
New shares issued * |  |  | 47,724,395 |  |  |  |
Issued at December 31, 2017 |  |  | 142,417,407 |  |  |  |
Restricted stock issued |  |  | 1,175,136 |  |  |  |
Retirement of treasury shares |  |  | (892,497 | ) |  |  |
Issued at December 31, 2018 |  |  | 142,700,046 |  |  |  |
Par value |  | $ | 0.01 |  |  | $ | 0.01 |
Shares to be issued assuming conversion of convertible notes due 2019** |  |  | 6,562,001 |  |  |  |  |
Shares to be issued assuming conversion of convertible notes due 2021** |  |  | 29,761,913 |  |  |  |  |
Number of shares authorized for issue at December 31, 2018 |  |  | 250,000,000 |  |  |  |  |
Dividend payment | Dividend payment:
Dividend payment as of December 31, 2018: |  |  | Per share |
Payment date: | Total payment |  | Common |
February 28, 2018 | $ 2.9 million |  | $ | 0.02 |
May 30, 2018 | $ 2.9 million |  | $ | 0.02 |
August 31, 2018 | $ 2.9 million |  | $ | 0.02 |
November 23, 2018 | $ 2.9 million |  | $ | 0.02 |
Total payment as of December 31, 2018: | $ 11.5 million |  | $ | 0.08 |
Dividend payment as of December 31, 2017: |  |  |  |  |
Payment date: |  |  |  |  |
February 22, 2017 | $ 7.6 million |  | $ | 0.08 |
May 31, 2017 | $ 10.1 million |  | $ | 0.08 |
August 31, 2017 | $ 2.8 million |  | $ | 0.02 |
December 6, 2017 | $ 2.8 million |  | $ | 0.02 |
Total payment as of December 31, 2017: | $ 23.3 million |  | $ | 0.20 |
Dividend payment as of December 31, 2016: |  |  |  |  |
Payment date: |  |  |  |  |
February 24, 2016 | $ 19.7 million |  | $ | 0.21 |
May 25, 2016 | $ 23.3 million |  | $ | 0.25 |
August 31, 2016 | $ 21.5 million |  | $ | 0.23 |
November 23, 2016 | $ 1.9 million |  | $ | 0.02 |
Total payment as of December 31, 2016: | $ 66.4 million |  | $ | 0.71 |

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