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Acquisitions (Details) - Wharf Gold Mine [Member] - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 20, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |
Cash | $ 99,400 |  |  |  |
Transaction advisory fees and other acquisition costs | $ 2,100 |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |
Revenue |  | $ 182,007 | $ 166,263 | $ 330,394 | $ 337,219
Income (loss) before income and mining taxes |  | 13,729 | (16,937) | (4,561) | (50,209)
Net income (loss) |  | $ 14,497 | $ (16,677) | $ (5,899) | $ (50,017)

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