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Stockholders equity and dividend payment - Stockholders equity (Details)	Sep. 30, 2019 $ / shares shares
Common Stock [Member]
Stockholders' equity
Issued at September 30	142,418,941
Numbers of shares authorized for issue at September 30, 2019	250,000,000
Par value | $ / shares	$ 0.01
Common Stock [Member] | Convertible notes due 2019 [Member]
Stockholders' equity
Shares to be issued assuming conversion of convertible notes	6,789,844	[1]
Common Stock [Member] | Convertible Notes due 2021 [Member]
Stockholders' equity
Shares to be issued assuming conversion of convertible notes	30,824,087	[1]
Preferred Stock [Member]
Stockholders' equity
Numbers of shares authorized for issue at September 30, 2019	1,000,000
Par value | $ / shares	$ 0.01
[1] assuming the maximum Fundamental Change conversion rate.

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.

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X

- Definition

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

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- Definition

Disclosure of stockholders' equity.

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- Definition

The number of shares authorised.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 1
-IssueDate 2019-01-01
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- Definition

The nominal value per share.

+ References

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