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Stockholders equity and dividend payment - Stockholders equity (Details) - $ / shares	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common Stock [Member]
Stockholders' equity
Common stock issued	142,417,407	93,433,804	92,909,936
Restricted stock issued	1,259,208	883,699
Number of treasury shares		(359,831)
New shares issued	47,724,395
Par value	$ 0.01
Shares to be issued assuming conversion of convertible notes*	20,904,879
Number of shares authorized for issue	250,000,000
Preferred Stock [Member]
Stockholders' equity
Par value	$ 0.01

X

- 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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X

- Definition

The number of treasury shares

+ References

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- Definition

Number of shares of Restricted Stock issued.

+ References

No definition available.

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X

- Definition

The number of shares to be issued assuming conversion of convertible notes.

+ References

No definition available.

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X

- Definition

Disclosure of stockholders' equity.

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X

- Definition

The number of shares authorised.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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
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-IssueDate 2017-01-01
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- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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