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Financial Instruments - Liquidity risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Non derivative financial Liabilities [Abstract]      
Short-term secured borrowings $ 369,300 $ 151,400  
Long-term unsecured borrowings (including current portion) 46,500 52,500  
Lease liabilities 11,675 15,860  
Guarantee deposits 66,631 55,215  
Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term unsecured borrowings 0 0 $ 0
Secured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term secured borrowings 369,300 151,400 $ 104,000
Not later than Six months      
Non derivative financial Liabilities [Abstract]      
Short-term secured borrowings 369,658 111,582  
Lease liabilities 2,188 2,460  
Guarantee deposits 14,532 1,165  
Total 390,668 118,374  
Not later than Six months | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Long-term unsecured borrowings (including current portion) 4,290 3,167  
Later than six months and not later than one year      
Non derivative financial Liabilities [Abstract]      
Short-term secured borrowings 0 40,019  
Lease liabilities 2,166 2,298  
Guarantee deposits 0 0  
Total 6,325 45,476  
Later than six months and not later than one year | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Long-term unsecured borrowings (including current portion) 4,159 3,159  
Later than one year and not later than two years      
Non derivative financial Liabilities [Abstract]      
Lease liabilities 4,868 3,881  
Guarantee deposits 52,099 5,840  
Total 65,026 16,008  
Later than one year and not later than two years | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Long-term unsecured borrowings (including current portion) 8,059 6,287  
Later than two years and not later than five years      
Non derivative financial Liabilities [Abstract]      
Lease liabilities 2,693 7,513  
Guarantee deposits   48,210  
Total 24,879 74,347  
Later than two years and not later than five years | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Long-term unsecured borrowings (including current portion) 22,186 18,624  
Later than five years      
Non derivative financial Liabilities [Abstract]      
Short-term secured borrowings 0 0  
Lease liabilities 0 22  
Guarantee deposits 0 0  
Total 17,740 22,800  
Later than five years | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Long-term unsecured borrowings (including current portion) 17,740 22,778  
Contractual Cash Flows      
Non derivative financial Liabilities [Abstract]      
Short-term secured borrowings 369,658 151,601  
Lease liabilities 11,915 16,174  
Guarantee deposits 66,631 55,215  
Total 504,638 277,005  
Contractual Cash Flows | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Long-term unsecured borrowings (including current portion) $ 56,434 $ 54,015