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Assets and Liabilities Held For Sale - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Write-down of assets |  | $ 3,400 |  |
Cash provided by (used in) operating activities, discontinued operations |  | 11,296 | $ 29,356 | $ 26,130
Cash provided by (used in) investing activities, discontinued operations |  | (1,392) | (6,631) | (6,220)
Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net smelter returns royalty (percentage) | 2.00% |  |  |
Net smelter returns royalty, estimated value | $ 5,000 |  |  |
Value added tax receivable, outstanding | 13,000 |  |  |
Promissory note receivable | 28,000 |  |  |
Expected post-closing obligations | $ 6,000 |  |  |
Cash provided by (used in) operating activities, discontinued operations |  | 11,296 | 29,356 | 26,130
Cash provided by (used in) investing activities, discontinued operations |  | $ (1,392) | $ (6,631) | $ (6,220)

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