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Financial Instruments - Liquidity risk (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Non derivative financial Liabilities [Abstract] |  |  |
Short-term secured borrowings | $ 151,400 | $ 104,000 |
Long-term unsecured borrowings (including current portion) | 52,500 | 58,500 |
Lease liabilities | 15,860 | 10,454 |
Guarantee deposits | 55,215 | 5,765 |
Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term unsecured borrowings | 0 | 0 | $ 57,339
Secured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term secured borrowings | 151,400 | 104,000 | $ 164,000
Not later than Six months [Member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term secured borrowings | 111,582 | 104,106 |
Lease liabilities | 2,460 | 1,600 |
Guarantee deposits | 1,165 | 5,765 |
Non-derivative financial liabilities, undiscounted cash flows | 118,374 | 114,687 |
Not later than Six months [Member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | 3,167 | 3,216 |
Later than six months and not later than one year [member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term secured borrowings | 40,019 | 0 |
Lease liabilities | 2,298 | 1,603 |
Guarantee deposits | 0 | 0 |
Non-derivative financial liabilities, undiscounted cash flows | 45,476 | 4,812 |
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) | 3,159 | 3,209 |
Later than one year and not later than two years [member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Lease liabilities | 3,881 | 4,538 |
Guarantee deposits | 5,840 | 0 |
Non-derivative financial liabilities, undiscounted cash flows | 16,008 | 10,917 |
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) | 6,287 | 6,379 |
Later than two years and not later than five years [member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Lease liabilities | 7,513 | 2,984 |
Guarantee deposits | 48,210 | 0 |
Non-derivative financial liabilities, undiscounted cash flows | 74,347 | 21,846 |
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) | 18,624 | 18,862 |
Later than five years [member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term secured borrowings | 0 | 0 |
Lease liabilities | 22 | 0 |
Guarantee deposits | 0 | 0 |
Non-derivative financial liabilities, undiscounted cash flows | 22,800 | 29,018 |
Later than five years [member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | 22,778 | 29,018 |
Contractual Cash Flows [Member] |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Short-term secured borrowings | 151,601 | 104,106 |
Lease liabilities | 16,174 | 10,725 |
Guarantee deposits | 55,215 | 5,765 |
Non-derivative financial liabilities, undiscounted cash flows | 277,005 | 181,280 |
Contractual Cash Flows [Member] | Unsecured Borrowings |  |  |
Non derivative financial Liabilities [Abstract] |  |  |
Long-term unsecured borrowings (including current portion) | $ 54,015 | $ 60,684 |

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