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v3.19.3.a.u2

Write-Downs (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 250,814 | $ 0 | $ 0
Silvertip [Member] |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use | 250,800 |  |
Property, Plant and Equipment [Member] | Silvertip [Member] |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use | 43,600 |  |
Mine Development [Member] | Silvertip [Member] |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use | 201,500 |  |
Other Noncurrent Assets [Member] | Silvertip [Member] |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 5,700 |  |

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