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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Changes in Company's Investment in MSC (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Change in the investment in MSC      
Investment in MSC, beginning balance $ 150,064    
Income tax recovery (1,138) $ (2,656)  
Investment in MSC, ending balance 145,001   $ 150,064
MSC      
Change in the investment in MSC      
Investment in MSC, beginning balance 150,064 162,320 162,320
Attributable net income from MSC 430 2,147 (2,328)
Amortization of fair value increments (2,115) (2,069) (9,632)
Income tax recovery 1,473 $ 112 11,916
Dividends received (4,851)   (12,212)
Investment in MSC, ending balance $ 145,001   $ 150,064