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Financial Instruments - Liquidity risk (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Non derivative financial Liabilities [Abstract] |  |  |
Short-term unsecured borrowings | $ 0 | $ 57,339 |
Short-term secured borrowings | 104,000 | 164,000 |
Long-term unsecured borrowings (including current portion) | 58,500 | 0 |
Lease liabilities | 10,454 | 4,220 |
Guarantee deposits | 5,765 | 400 |
Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term unsecured borrowings | 0 | 57,339 | $ 20,000
Secured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term secured borrowings | 104,000 | 164,000 | $ 164,000
Not later than Six months [Member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term unsecured borrowings |  | 57,625 |
Short-term secured borrowings | 104,106 | 114,248 |
Lease liabilities | 1,600 | 971 |
Guarantee deposits | 5,765 | 400 |
Non-derivative financial liabilities, undiscounted cash flows | 114,687 | 173,244 |
Not later than Six months [Member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | 3,216 |  |
Later than six months and not later than one year [member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term unsecured borrowings |  | 0 |
Short-term secured borrowings | 0 | 50,006 |
Lease liabilities | 1,603 | 559 |
Guarantee deposits | 0 | 0 |
Non-derivative financial liabilities, undiscounted cash flows | 4,812 | 50,565 |
Later than six months and not later than one year [member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | 3,209 |  |
Later than one year and not later than two years [member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Lease liabilities | 4,538 | 1,614 |
Guarantee deposits | 0 | 0 |
Non-derivative financial liabilities, undiscounted cash flows | 10,917 | 1,614 |
Later than one year and not later than two years [member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | 6,379 |  |
Later than two years and not later than five years [member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Lease liabilities | 2,984 | 1,306 |
Guarantee deposits | 0 | 0 |
Non-derivative financial liabilities, undiscounted cash flows | 21,846 | 1,306 |
Later than two years and not later than five years [member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | 18,862 |  |
Later than five years [member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term unsecured borrowings |  | 0 |
Short-term secured borrowings | 0 | 0 |
Lease liabilities | 0 | 0 |
Guarantee deposits | 0 | 0 |
Non-derivative financial liabilities, undiscounted cash flows | 29,018 | 0 |
Later than five years [member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | 29,018 |  |
Contractual Cash Flows [Member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term unsecured borrowings |  | 57,625 |
Short-term secured borrowings | 104,106 | 164,254 |
Lease liabilities | 10,725 | 4,450 |
Guarantee deposits | 5,765 | 400 |
Non-derivative financial liabilities, undiscounted cash flows | 181,280 | $ 226,729 |
Contractual Cash Flows [Member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | $ 60,684 |  |

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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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