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Acquisitions (Details) - Wharf Gold Mine [Member] - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 20, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Business Acquisition [Line Items] |  |  |
Cash | $ 99,400 |  |
Transaction advisory fees and other acquisition costs | $ 2,100 |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |
Revenue |  | $ 148,387 | $ 170,956
Income (loss) before income and mining taxes |  | (18,290) | (33,271)
Net income (loss) |  | $ (20,396) | $ (33,340)

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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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