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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)