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Acquisitions (Details) - Wharf Gold Mine [Member] - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 20, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred | $ 99,396 |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |
Revenue |  | $ 665,777 | $ 664,086 | $ 729,742
Income (loss) before income and mining taxes |  | $ 1,113 | (393,498) | (1,587,128)
Net income (loss) |  |  | $ (367,235) | $ (1,158,874)

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