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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2016
Feb. 20, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Golden Cross [Member]            
Business Acquisition [Line Items]            
Business Combination, Consideration Transferred $ 1,400          
Wharf Gold Mine [Member]            
Business Acquisition [Line Items]            
Cash   $ 99,400        
Transaction advisory fees and other acquisition costs   $ 2,100        
Business Acquisition, Pro Forma Information [Abstract]            
Revenue     $ 176,247 $ 162,552 $ 506,641 $ 499,770
Income (loss) before income and mining taxes     15,102 (22,479) 10,542 (72,688)
Net income (loss)     $ 69,557 $ (14,219) $ 63,660 $ (64,237)