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Supplemental Cashflow Information (Schedule of changes in working capital) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Supplemental Cashflow Information [abstract]    
Trade and other receivables $ (16,897) $ 10,258
Prepaid expenses (2,149) 161
Inventories (23,824) (25,659)
Trade and other payables 3,556 6,122
Increase (decrease) in working capital $ (39,314) $ (9,118)