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Share-based compensation - Schedule of management and director options activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of options (in shares) |  |  |
Outstanding (in shares) | 8,888,053 | 8,888,053 | 9,596,993
Forfeited (in shares) | (393,717) | 0 | (558,138)
Exercised (in shares) | (187,678) | 0 | (150,802)
Outstanding (in shares) | 8,306,658 | 8,888,053 | 8,888,053
Weighted average exercise price (in dollars per share) |  |  |
Outstanding (in dollars per share) | $ 13.43 | $ 13.43 | $ 13.64
Forfeited (in dollars per share) | 14.73 | 0 | 18.00
Exercised (in dollars per share) | 10.00 | 0 | 10.00
Outstanding (in dollars per share) | $ 13.45 | 13.43 | $ 13.43
Management and director options |  |  |
Number of options (in shares) |  |  |
Outstanding (in shares) | 8,306,658 |  |
Weighted average exercise price (in dollars per share) |  |  |
Outstanding (in dollars per share) | $ 13.45 |  |
Management and director options | $10.00 - $10.89 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Exercise price, lower limit (in dollars per share) | $ 10.00 | $ 10.00 |
Number of options (in shares) |  |  |
Outstanding (in shares) | 4,774,694 |  |
Weighted average exercise price (in dollars per share) |  |  |
Outstanding (in dollars per share) | $ 10.04 |  |

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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