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Other Expenses (Schedule of Other Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other Expenses [abstract]    
Write-down (recovery) of investment in associates $ 327 $ (194)
Loss on disposal of assets and other write-downs 818 878
Write-off of accounts receivable 659 484
Other expenses (income) 4,730 (308)
SGM Royalty settlement 9,600 447
Care and maintenance costs related to COVID-19   3,121
Share of loss from associates   76
Other (income) expenses $ 16,134 $ 4,504