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Significant accounting principles, Application of new and revised international financial reporting standards ("IFRSs") (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 05, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Initial Recognition Lease Liability and Right of Use Asset [Abstract] |  |  |  |  |
The weighted average incremental borrowing rate applied |  |  | 3.18% |  |
Amounts Recognized in the Consolidated Statement of Financial Position [Abstract] |  |  |  |  |
Lease liability (Other non-current liabilities) |  |  | $ 2,241 |  |
Lease liability (Other current liabilities) |  |  | 605 |  |
Right-of-use asset (Other property, plant and equipment) |  |  | 2,808 |  |
Consolidated Income Statement and Consolidated Statement of Comprehensive Income [Abstract] |  |  |  |  |
Depreciation IFRS 16 (Depreciation and amortization expense) |  |  | (115,584) | $ (103,476) | $ (96,758)
IFRS 16 interest expense (other financial expense) |  |  | (1,790) | (4,943) | 443
Consolidated Statement of Cash Flow and Reconciliation of Changes in Liabilities Incurred from Financing Activities [Abstract] |  |  |  |  |
Principal paid on the lease liability (Repayment principal element of lease liability) |  |  | (370) | 0 | $ 0
IFRS 16 Leases [Member] |  |  |  |  |
Impact of initial application of IFRS 16 Leases [Abstract] |  |  |  |  |
Increase in lease liability | $ 100 | $ 1,600 |  |  |
Increase in right-of-use lease asset | $ 100 | $ 1,600 |  |  |
Initial Recognition Lease Liability and Right of Use Asset [Abstract] |  |  |  |  |
Operating lease commitment at December 31, 2018 as disclosed |  |  |  | 529 |
Extension options reasonably certain to be exercised |  |  |  | 1,162 |
Practical expedient related to short-term leases |  |  |  | (3) |
Practical expedient related to low-value leases |  |  |  | 0 |
Discounting using the incremental borrowing rate as of January 1, 2019 |  |  |  | (204) |
Lease liability recognized at initial application of IFRS 16 as of January 1, 2019 |  |  |  | $ 1,484 |
The weighted average incremental borrowing rate applied |  |  |  | 4.03% |
Amounts Recognized in the Consolidated Statement of Financial Position [Abstract] |  |  |  |  |
Right-of-use asset (Other property, plant and equipment) |  |  |  | $ 1,500 |
Consolidated Income Statement and Consolidated Statement of Comprehensive Income [Abstract] |  |  |  |  |
Lease payment |  |  | 442 |  |
Depreciation IFRS 16 (Depreciation and amortization expense) |  |  | (405) |  |
IFRS 16 interest expense (other financial expense) |  |  | (72) |  |
Consolidated Statement of Cash Flow and Reconciliation of Changes in Liabilities Incurred from Financing Activities [Abstract] |  |  |  |  |
Principal paid on the lease liability (Repayment principal element of lease liability) |  |  | $ (370) |  |

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- Definition The amount of liabilities related to the entity's leases of extension options that are reasonably certain to be exercised. + References No definition available. + Details
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- Definition Amount of increase (decrease) in lease liability. + References No definition available. + Details
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- Definition The amount of practical expedient related to low-value leases. + References No definition available. + Details
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- Definition The amount of practical expedient related to short-term leases. + References No definition available. + Details
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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_g&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 23 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_23_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_28_e&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B13 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B13_d&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_102&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_99&doctype=Standard -URIDate 2019-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_104&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of finance income or cost that the entity does not separately disclose in the same statement or note. [Refer: Finance income (cost)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph C12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C -URIDate 2019-03-27 + Details
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