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Stockholders' equity and dividend payment, Stockholders' equity (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 Vote $ / shares shares | Dec. 31, 2018 shares | Jan. 31, 2017 $ / shares
Common Stock [Abstract] |  |  |  |
Number of vote per common stock | Vote |  | 1 |  |
Common Stock [Member] |  |  |  |
Stockholders' Equity [Abstract] |  |  |  |
Issued, Beginning balance (in shares) |  | 142,700,046 | 142,417,407 |
Restricted stock issued (in shares) |  | 790,571 | 1,175,136 |
Conversion of convertible bonds (in shares) |  | 4,390,025 |  |
Retirement of treasury shares (in shares) |  | (1,061,241) | (892,497) |
Issued, Ending balance (in shares) |  | 146,819,401 | 142,700,046 |
Par value (in dollars per share) | $ / shares |  | $ 0.01 |  | $ 0.01
Shares to be issued assuming conversion of convertible notes due in 2021 (in shares) | [1] | 31,141,489 |  |
Number of shares authorized for issue (in shares) |  | 250,000,000 |  |
Preference Shares [Member] |  |  |  |
Stockholders' Equity [Abstract] |  |  |  |
Par value (in dollars per share) | $ / shares |  | $ 0.01 |  |
[1] | Assuming the maximum fundamental change conversion rate.

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- Definition The increase (decrease) in the number of shares of equity resulting from the conversion of convertible instruments during the period. + References No definition available. + Details
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