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Stockholders' equity and dividend payment (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' equity and dividend payment [Abstract] |
Stockholders Equity | Stockholders’ equity:
(Dollars in thousands, except per share data) |  | Common stock |  |  | Preferred stock
Issued at December 31, 2018 |  |  | 142,700,046 |  |  |  |
Restricted stock issued |  |  | 790,571 |  |  |  |
Conversion of convertible bonds |  |  | 4,390,025 |  |  |  |
Retirement of treasury shares |  |  | (1,061,241 | ) |  |  |
Issued at December 31, 2019 |  |  | 146,819,401 |  |  |  |
Restricted stock issued |  |  | 601,530 |  |  |  |
Conversion of convertible bonds |  |  | 23,377,397 |  |  |  |
Issued at December 31, 2020 |  |  | 170,798,328 |  |  |  |
Par value |  | $ | 0.01 |  |  | $ | 0.01
Number of shares authorized for issue at December 31, 2020 |  |  | 250,000,000 |  |  |  |
Dividend Payment | Dividend payment:
Dividend payment as of December 31, 2020: |  |  | Per share
Payment date: | Total payment |  | Common
February 25, 2020 | $ 47.0 million |  | $ | 0.32
May 26, 2020 | $ 51.5 million |  | $ | 0.35
September 2, 2020 | $ 82.0 million |  | $ | 0.48
November 25, 2020 | $ 34.2 million |  | $ | 0.20
Total payment as of December 31, 2020: | $ 214.7 million |  | $ | 1.35
Dividend payment as of December 31, 2019: |  |  | Per share
Payment date: | Total payment |  | Common
February 26, 2019 | $ 7.1 million |  | $ | 0.05
May 28, 2019 | $ 11.4 million |  | $ | 0.08
August 29, 2019 | $ 2.8 million |  | $ | 0.02
November 14, 2019 | $ 7.3 million |  | $ | 0.05
Total payment as of December 31, 2019: | $ 28.7 million |  | $ | 0.20
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

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