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Stockholders equity and dividend payment (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2015 |  |  | 92,909,936 |  |  |  |
Restricted stock issued |  |  | 883,699 |  |  |  |
Purchase of treasury shares |  |  | (359,831 | ) |  |  |
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 |  |  |  |
Par value |  | $ | 0.01 |  |  | $ | 0.01 |
Shares to be issued assuming conversion of convertible notes** |  |  | 20,904,879 |  |  |  |  |
Number of shares authorized for issue at December 31, 2017 |  |  | 250,000,000 |  |  |  |  |
Dividend payment | Dividend payment:
Dividend payment as of December 31, 2017: |  |  | Total payment |  | Per Share Common |
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 |
Dividend payment as of December 31, 2015: |  |  |  |  |  |  |
Payment date: |  |  |  |  |  |  |
February 19, 2015 |  |  | $ 4.6 million |  | $ | 0.05 |
May 22, 2015 |  |  | $ 13.9 million |  | $ | 0.15 |
August 20, 2015 |  |  | $ 13.9 million |  | $ | 0.15 |
November 25, 2015 |  |  | $ 16.7 million |  | $ | 0.18 |
Total payment as of December 31, 2015: |  |  | $ 49.2 million |  | $ | 0.53 |

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