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Supplementary cash flow information (Schedule of change in non-cash working capital) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Supplementary Cash Flow Information [Abstract]    
Trade and other receivables $ (37,720) $ 3,252
Other financial assets/liabilities 4,077 12,540
Inventories (2,867) (11,759)
Prepaid expenses (3,722) (3,484)
Trade and other payables 36,247 5,613
Provisions and other liabilities 1,602 (2,590)
Increase (decrease) in working capital $ (2,383) $ 3,572