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Other Expenses (Schedule of Other Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Other Expense [abstract]    
Loss (gain) on disposal of property, plant, and equipment $ 1,450 $ (3)
Write off of inventories 985 280
Write off of mineral properties 202 1,143
Other income (956)  
Other expenses, by nature $ 1,681 $ 1,420