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Share-based compensation - Schedule of management and director options activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of options (in shares)
Outstanding (in shares)	8,306,658	8,888,053	8,888,053
Forfeited (in shares)	0	(393,717)	0
Exercised (in shares)	0	(187,678)	0
Outstanding (in shares)	8,306,658	8,306,658	8,888,053
Weighted average exercise price (in dollars per share)
Outstanding (in dollars per share)	$ 13.45	$ 13.43	$ 13.43
Forfeited (in dollars per share)	0	14.73	0
Exercised (in dollars per share)	0	10.00	0
Outstanding (in dollars per share)	$ 13.45	$ 13.45	$ 13.43

X

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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- Definition

Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Number of share options (or share units) exercised during the current period.

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