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Financial - risk management objectives and policies - Credit risk exposure (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Disclosure of credit risk exposure [line items]    
Trade receivables $ 168,346 $ 171,670
Other receivables 753,562 735,491
Total trade and other receivables $ 921,908 $ 907,161
Expected credit loss rate 0.00% 0.00%
Expected credit loss $ (26,382) $ (30,897)
Current    
Disclosure of credit risk exposure [line items]    
Trade receivables 146,070 149,394
Other receivables 749,456 726,870
Total trade and other receivables $ 895,526 $ 876,264
Expected credit loss rate 0.00% 0.00%
Expected credit loss $ 0 $ 0
Not later than one month    
Disclosure of credit risk exposure [line items]    
Trade receivables 0 0
Other receivables 0 0
Total trade and other receivables $ 0 $ 0
Expected credit loss rate 0.00% 0.00%
Expected credit loss $ 0 $ 0
Later than one month and not later than three months    
Disclosure of credit risk exposure [line items]    
Trade receivables 0 0
Other receivables 0 0
Total trade and other receivables $ 0 $ 0
Expected credit loss rate 0.00% 0.00%
Expected credit loss $ 0 $ 0
Later than three months    
Disclosure of credit risk exposure [line items]    
Trade receivables 22,276 22,276
Other receivables 4,106 8,621
Total trade and other receivables $ 26,382 $ 30,897
Expected credit loss rate 100.00% 100.00%
Expected credit loss $ (26,382) $ (30,897)