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Stockholders' equity and dividend payment - Stockholders' equity (Details) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Common Stock [Member] |  |  |  |
Stockholders' equity |  |  |  |
Common stock issued |  | 142,700,046 | 142,417,407 | 93,433,804
Restricted stock issued |  | 1,175,136 | 1,259,208 |
Retirement of treasury shares |  | (892,497) |  |
New shares issued | [1] | 0 | 47,724,395 |
Par value |  | $ 0.01 |  |
Shares to be issued assuming conversion of convertible notes due 2019 | [2] | 6,562,001 |  |
Shares to be issued assuming conversion of convertible notes due in 2021 | [2] | 29,761,913 |  |
Number of shares authorized for issue |  | 250,000,000 |  |
Preferred Stock [Member] |  |  |  |
Stockholders' equity |  |  |  |
Par value |  | $ 0.01 |  |
[1] | On March 23, 2017, we announced that we entered into the VAA, to acquire nine VLCCs and newbuild contracts for two VLCCs due for delivery in 2018 from BW Group, in exchange for aggregate cash consideration in an amount equal to $177,360,000 and an aggregate equity consideration consisting of 32,024,395 shares of the Company's common stock and 15,700 shares of the Series D Preferred Stock. Subsequent to the conversion of each share of the Series D Preferred Stock into 1,000 shares of Company common stock in 2017, a total of 47,724,395 shares of common stock were issued.
[2] | Assuming the maximum fundamental change conversion rate.

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References No definition available. + Details
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- Definition Number of shares of Restricted Stock issued. + References No definition available. + Details
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- Definition Disclosure of stockholders' equity. + References No definition available. + Details
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- Definition Number of shares of common and preferred stock retired from treasury. + References No definition available. + Details
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- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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