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Other Expenses (Schedule of Other Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other Expenses [abstract]    
Write-down of investment in associate $ 2,706  
Write off of mineral properties 1,554  
Loss (gain) on disposal of assets 67 $ 167
Write-off of spare parts   398
Write off of assets held for sale   691
Other expenses 284 705
Other (income) expenses $ 4,611 $ 1,961