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Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
IFRS Statement [Line Items]        
Financial assets measured at fair value through profit or loss $ 21,765 $ 13,500    
Financial assets measured at fair value through other comprehensive income 742 709    
Measured at amortized cost:        
Cash and cash equivalents 184,938 101,055 $ 106,437 $ 138,023
Financial asset at amortized cost 8,682 11,049    
Accounts receivable and other receivables (including related parties) 243,626 164,943    
Restricted deposit (including current and noncurrent) 104,000 164,000    
Total 584,574 463,195    
Financial assets at amortised cost, category [member]        
Measured at amortized cost:        
Cash and cash equivalents 184,938 101,055    
Financial asset at amortized cost 8,682 11,049    
Accounts receivable and other receivables (including related parties) 252,162 168,377    
Restricted deposit (including current and noncurrent) 104,141 164,133    
Refundable deposits 12,144 4,372    
Subtotal $ 562,067 $ 448,986