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Inventories (Schedule of detailed information about inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current    
Stockpile $ 10,396 $ 5,463
Work in progress 14,420 1,762
Finished goods 62,230 62,546
Materials and supplies 51,774 48,703
Current inventories 138,820 118,474
Non-current    
Stockpile 14,626 14,730
Materials and supplies 4,829 4,746
Non current inventories 19,455 19,476
Total inventories $ 158,275 $ 137,950