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Financial instruments, Reconciliation of liabilities arising from financing activities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of liabilities arising from financing activities [Abstract] |  |  |  |  |
Beginning balance | [1] | $ 853,817 | $ 968,759 | [2] |
Financing cash flows | [1],[3] | (287,199) | (98,243) |  |
Non-cash changes [Abstract] |  |  |  |  |
Amortization | [1] | 5,538 | 8,003 |  |
Equity component of convertible notes | [1] | (119,818) | (26,434) |  |
Other changes | [1],[4] | 1,681 | 1,732 |  |
Ending balance | [1] | 454,019 | 853,817 |  |
IFRS 16 Leases [Member] |  |  |  |  |
Reconciliation of liabilities arising from financing activities [Abstract] |  |  |  |  |
Beginning balance | [1],[2] | 853,817 |  |  |
Non-cash changes [Abstract] |  |  |  |  |
Ending balance | [1],[2] |  | 853,817 |  |
Initial recognition of a lease liability |  |  |  |  | $ 1,484
Bank Loans [Member] |  |  |  |  |
Reconciliation of liabilities arising from financing activities [Abstract] |  |  |  |  |
Beginning balance | [2] | 734,404 | 823,299 |  |
Financing cash flows | [3] | (286,733) | (91,440) |  |
Non-cash changes [Abstract] |  |  |  |  |
Amortization |  | 2,288 | 2,545 |  |
Ending balance |  | 449,959 | 734,404 | [2] |
Convertible Senior Notes due 2019 [Member] |  |  |  |  |
Reconciliation of liabilities arising from financing activities [Abstract] |  |  |  |  |
Beginning balance |  | 0 | 32,009 | [2] |
Financing cash flows | [3] |  | (6,426) |  |
Non-cash changes [Abstract] |  |  |  |  |
Amortization |  |  | 851 |  |
Equity component of convertible notes |  |  | (26,434) |  |
Ending balance |  |  | 0 |  |
Convertible Senior Notes due 2021 [Member] |  |  |  |  |
Reconciliation of liabilities arising from financing activities [Abstract] |  |  |  |  |
Beginning balance | [2] | 116,568 | 111,968 |  |
Financing cash flows | [3] |  | (7) |  |
Non-cash changes [Abstract] |  |  |  |  |
Amortization |  | 3,250 | 4,607 |  |
Equity component of convertible notes |  | (119,818) |  |  |
Ending balance |  | 0 | 116,568 | [2] |
Office Leases [Member] |  |  |  |  |
Reconciliation of liabilities arising from financing activities [Abstract] |  |  |  |  |
Beginning balance | [2] | 2,846 |  |  |
Financing cash flows | [3] | (467) | (370) |  |
Non-cash changes [Abstract] |  |  |  |  |
Other changes | [4] | 1,681 | 1,732 |  |
Ending balance |  | $ 4,060 | 2,846 | [2] |
Office Leases [Member] | IFRS 16 Leases [Member] |  |  |  |  |
Reconciliation of liabilities arising from financing activities [Abstract] |  |  |  |  |
Beginning balance | [2] |  | $ 1,484 |  |
[1] | The reconciliation does not include interest rate swaps, which are described in note 8.
[2] | The opening balance as at January 1, 2019 includes the initial recognition of the lease liability of $1.5 million resulting from the adoption of the IFRS 16 Leases standard.
[3] | The cash flows from bank loans make up the net amount of issuance of long term debt and repayment of long term debt in the statement of cash flows.
[4] | Other changes for 2020 and 2019 represents new, modified office leases and foreign exchange effects during the year related to IFRS 16 Leases.

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- Definition The increase (decrease) in liabilities arising from financing activities in non-cash changes in amortization related to financing activities. + References No definition available. + Details
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- Definition The increase (decrease) in liabilities arising from financing activities in equity component of convertible notes related to financing activities. + References No definition available. + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44B -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44D&doctype=Standard -URIDate 2020-01-01 + Details
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