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Investment in associate - Statements of financial position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [line items]      
Cash and cash equivalents $ 416,763 $ 256,077 $ 375,479
Other current assets 8,180 60,931  
Non-current assets 3,964,094 3,356,923  
Current liabilities (648,246) (1,047,353)  
Investment in associate 193,474 197,821  
Atlas Methanol Company Unlimited      
Disclosure of associates [line items]      
Net assets 117,152 121,499  
Long-term receivable from Atlas 76,322 76,322  
Investment in associate $ 193,474 $ 197,821  
Percentage of ownership interest in associates 63.10% 63.10%  
Atlas Methanol Company Unlimited      
Disclosure of associates [line items]      
Cash and cash equivalents $ 50,149 $ 9,367  
Other current assets 60,709 104,742  
Non-current assets 241,860 255,822  
Current liabilities (28,191) (32,022)  
Other long-term liabilities, including current maturities (138,866) (145,359)  
Net assets $ 185,661 $ 192,550