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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