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Reversal of Impairment and Goodwill - Reversals of Impairment (Details) $ in Thousands, Ounce in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Ounce | Dec. 31, 2016 USD ($)
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Period of analyst consensus prices used for economic impairment modeling | 4 years |
Reversals of impairment | $ 61,554 | $ 0
Reversal of impairment, net of tax | 53,400 |
Morococha mine [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Reversals of impairment | 60,237 | 0
Reversal of impairment, net of tax | $ 52,100 |
Increase in silver mineral reserve | Ounce | 2.8 |
Calcatreu project [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Reversals of impairment | $ 1,317 | $ 0

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- Details
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