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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)