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Investment in associate - Statements of financial position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [line items]      
Cash and cash equivalents $ 833,841 $ 416,763 $ 256,077
Other current assets 6,634 8,180  
Non-current assets 4,101,134 3,964,094  
Current liabilities (765,392) (648,246)  
Investment in associate 194,025 193,474  
Atlas Methanol Company Unlimited      
Disclosure of associates [line items]      
Net assets 117,703 117,152  
Long-term receivable from Atlas 76,322 76,322  
Investment in associate $ 194,025 $ 193,474  
Percentage of ownership interest in associates 63.10% 63.10%  
Atlas Methanol Company Unlimited      
Disclosure of associates [line items]      
Cash and cash equivalents $ 40,815 $ 50,149  
Other current assets 65,434 60,709  
Non-current assets 256,421 241,860  
Current liabilities (43,057) (28,191)  
Other long-term liabilities, including current maturities (133,079) (138,866)  
Net assets $ 186,534 $ 185,661  
Ownership rate 100.00%