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Stockholders' equity and dividend payment, Dividend payment (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Feb. 25, 2020 | Nov. 14, 2019 | Aug. 29, 2019 | May 28, 2019 | Feb. 26, 2019 | Nov. 23, 2018 | Aug. 31, 2018 | May 30, 2018 | Feb. 28, 2018 | Dec. 06, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 22, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Dividend Payment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total payment |  | $ 7,300 | $ 2,800 | $ 11,400 | $ 7,100 | $ 2,900 | $ 2,900 | $ 2,900 | $ 2,900 | $ 2,800 | $ 2,800 | $ 10,100 | $ 7,600 | $ 28,685 | $ 11,487 | $ 23,328
Per share Common (in dollars per share) |  | $ 0.05 | $ 0.02 | $ 0.08 | $ 0.05 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.08 | $ 0.08 | $ 0.20 | $ 0.08 | $ 0.20
Subsequent events [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Payment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share Common (in dollars per share) | $ 0.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid, record date | Feb. 18, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment | $ 47,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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