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Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Inventory1 [Line Items] |  |
Gold and silver bullion | $ 35,052 | $ 47,916
In-process inventory | 16,345 | 11,464
Ore stock-pile inventory | 58,546 | 55,498
Materials and supplies | 124,028 | 91,567
Total Inventories | 233,971 | 206,445
Fekola |  |
Inventory1 [Line Items] |  |
Ore stock-pile inventory | 37,000 | 39,000
Otjikoto |  |
Inventory1 [Line Items] |  |
Ore stock-pile inventory | 18,000 | 13,000
Masbate |  |
Inventory1 [Line Items] |  |
Ore stock-pile inventory | 2,000 | 4,000
El Limon and La Libertad |  |
Inventory1 [Line Items] |  |
Net realizable value adjustment | $ 2,000 | $ 2,000

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